diff --git a/CHANGELOG.md b/CHANGELOG.md index 10436fa612b2..44fcf198b728 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -194,6 +194,14 @@ caching through `CommitKVStoreCacheManager`. Any application wishing to utilize must set it in their app via a `BaseApp` option. The `BaseApp` docs have been drastically improved to detail this new feature and how state transitions occur. * (docs/spec) All module specs moved into their respective module dir in x/ (i.e. docs/spec/staking -->> x/staking/spec) +* (docs/) [\#5379](https://github.com/cosmos/cosmos-sdk/pull/5379) Major documentation refactor, including: + * (docs/intro/) Add and improve introduction material for newcomers. + * (docs/basics/) Add documentation about basic concepts of the cosmos sdk such as the anatomy of an SDK application, the transaction lifecycle or accounts. + * (docs/core/) Add documentation about core conepts of the cosmos sdk such as `baseapp`, `server`, `store`s, `context` and more. + * (docs/building-modules/) Add reference documentation on concepts relevant for module developers (`keeper`, `handler`, `messages`, `queries`,...). + * (docs/interfaces/) Add documentation on building interfaces for the Cosmos SDK. + * Redesigned user interface that features new dynamically generated sidebar, build-time code embedding from GitHub, new homepage as well as many other improvements. + ### Bug Fixes @@ -206,6 +214,8 @@ to detail this new feature and how state transitions occur. * (baseapp) [\#5350](https://github.com/cosmos/cosmos-sdk/issues/5350) Allow a node to restart successfully after a `halt-height` or `halt-time` has been triggered. + + ## [v0.37.4] - 2019-11-04 ### Improvements diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md index 07b8b3d94055..139c9a4576ec 100644 --- a/CONTRIBUTING.md +++ b/CONTRIBUTING.md @@ -92,10 +92,9 @@ All PRs require two Reviews before merge (except docs changes, or variable name- If you open a PR on the Cosmos SDK, it is mandatory to update the relevant documentation in /docs. -- If your change relates to the core SDK (baseapp, store, ...), please update the docs/cosmos-hub folder and possibly the docs/spec folder. -- If your changes relate specifically to the gaia application (not including modules), please modify the docs/cosmos-hub folder. -- If your changes relate to a module, please update the module's spec in docs/spec. If the module is used by gaia, you might also need to modify docs/cosmos-hub. -- If your changes relate to the core of the CLI or Light-client (not specifically to module's CLI/Rest), please modify the docs/clients folder. +- If your change relates to the core SDK (baseapp, store, ...), please update the `docs/basics/`, `docs/core/` and/or `docs/building-modules/` folders. +- If your changes relate to the core of the CLI or Light-client (not specifically to module's CLI/Rest), please modify the `docs/interfaces/` folder. +- If your changes relate to a module, please update the module's spec in `x/moduleName/docs/spec/`. ## Forking diff --git a/README.md b/README.md index 54338119ab2b..25dae82fdf76 100644 --- a/README.md +++ b/README.md @@ -1,3 +1,8 @@ +--- +parent: + order: false +--- + # Cosmos SDK ![banner](docs/cosmos-sdk-image.jpg) @@ -12,7 +17,7 @@ [![riot.im](https://img.shields.io/badge/riot.im-JOIN%20CHAT-green.svg)](https://riot.im/app/#/room/#cosmos-sdk:matrix.org) The Cosmos-SDK is a framework for building blockchain applications in Golang. -It is being used to build `Gaia`, the first implementation of the Cosmos Hub. +It is being used to build [`Gaia`](https://github.com/cosmos/gaia), the first implementation of the Cosmos Hub. **WARNING**: The SDK has mostly stabilized, but we are still making some breaking changes. @@ -23,9 +28,9 @@ breaking changes. To learn how the SDK works from a high-level perspective, go to the [SDK Intro](./docs/intro/intro.md). -If you want to get started quickly and learn how to build on top of the SDK, please follow the [SDK Application Tutorial](https://github.com/cosmos/sdk-application-tutorial). You can also fork the tutorial's repo to get started building your own Cosmos SDK application. +If you want to get started quickly and learn how to build on top of the SDK, please follow the [SDK Application Tutorial](https://github.com/cosmos/sdk-application-tutorial). You can also fork the tutorial's repository to get started building your own Cosmos SDK application. -For more, please go to the [Cosmos SDK Docs](./docs/README.md) +For more, please go to the [Cosmos SDK Docs](./docs/). ## Cosmos Hub Mainnet diff --git a/docs/.vuepress/components/PageHistory.vue b/docs/.vuepress/components/PageHistory.vue deleted file mode 100644 index 22f2a7bd50ce..000000000000 --- a/docs/.vuepress/components/PageHistory.vue +++ /dev/null @@ -1,18 +0,0 @@ - - - diff --git a/docs/.vuepress/config.js b/docs/.vuepress/config.js index 84b4407653e5..4502495d68f3 100644 --- a/docs/.vuepress/config.js +++ b/docs/.vuepress/config.js @@ -1,95 +1,161 @@ -const glob = require("glob"); -const markdownIt = require("markdown-it"); -const meta = require("markdown-it-meta"); -const fs = require("fs"); -const _ = require("lodash"); - -const sidebar = (directory, array) => { - return array.map(i => { - const children = _.sortBy( - glob - .sync(`./${directory}/${i[1]}/*.md`) - .map(path => { - const md = new markdownIt(); - const file = fs.readFileSync(path, "utf8"); - md.use(meta); - md.render(file); - const order = md.meta.order; - return { path, order }; - }) - .filter(f => f.order !== false), - ["order", "path"] - ) - .map(f => f.path) - .filter(f => !f.match("readme")); - return { - title: i[0], - children - }; - }); -}; - module.exports = { + theme: "cosmos", title: "Cosmos SDK", - base: process.env.VUEPRESS_BASE || "/", + markdown: { + anchor: { + permalinkSymbol: "" + } + }, locales: { - "/": { - lang: "en-US" + '/': { + lang: 'en-US' + }, + 'kr': { + lang: "kr" }, - "/ru/": { - lang: "ru" + 'cn': { + lang: 'cn' }, + 'ru': { + lang: 'ru' + } }, + base: process.env.VUEPRESS_BASE || "/", themeConfig: { repo: "cosmos/cosmos-sdk", + docsRepo: "cosmos/cosmos-sdk", docsDir: "docs", editLinks: true, - docsBranch: "master", - locales: { - "/": { - label: "English", - sidebar: sidebar("", [ - ["Intro", "intro"], - ["Basics", "basics"], - ["SDK Core", "core"], - ["About Modules", "modules"], - ["Using the SDK", "sdk"], - ["Interfaces", "interfaces"] - ]) + label: "sdk", + sidebar: [ + { + title: "Using the SDK", + children: [ + { + title: "Modules", + directory: true, + path: "/modules" + }, + ] }, - "/ru/": { - label: "Русский", - sidebar: sidebar("ru", [ - ["Введение", "intro"], - ["Основы", "basics"], - ["SDK Core", "core"], - ["Модули", "modules"], - ["Используем SDK", "sdk"], - ["Интерфейсы", "interfaces"] - ]) + { + title: "Resources", + children: [ + { + title: "Tutorials", + path: "https://github.com/cosmos/sdk-application-tutorial" + }, + { + title: "SDK API Reference", + path: "https://godoc.org/github.com/cosmos/cosmos-sdk" + }, + { + title: "REST API Spec", + path: "https://cosmos.network/rpc/" + } + ] + } + ], + gutter: { + title: "Help & Support", + editLink: true, + chat: { + title: "Riot Chat", + text: "Chat with Cosmos developers on Riot Chat.", + url: "https://riot.im/app/#/room/#cosmos-sdk:matrix.org", + bg: "linear-gradient(225.11deg, #2E3148 0%, #161931 95.68%)" }, - '/kr/': { - label: '한국어', - sidebar: sidebar('kr', [ - ['소개', 'intro'], - ['기초', 'basics'], - ['SDK Core', 'core'], - ['모듈들', 'modules'], - ['프로그램 사용', 'sdk'], - ['인터페이스', 'interfaces'], - ]), + forum: { + title: "Cosmos SDK Forum", + text: "Join the SDK Developer Forum to learn more.", + url: "https://forum.cosmos.network/", + bg: "linear-gradient(225deg, #46509F -1.08%, #2F3564 95.88%)", + logo: "cosmos" }, - '/cn/': { - label: '中文', - sidebar: sidebar('cn', [ - ['介绍', 'intro'], - ['基本', 'basics'], - ['SDK Core', 'core'], - ['模块', 'modules'], - ['使用该程序', 'sdk'], - ['接口', 'interfaces'], - ]), + github: { + title: "Found an Issue?", + text: "Help us improve this page by suggesting edits on GitHub." + } + }, + footer: { + logo: "/logo-bw.svg", + textLink: { + text: "cosmos.network", + url: "https://cosmos.network" }, + services: [ + { + service: "medium", + url: "https://blog.cosmos.network/" + }, + { + service: "twitter", + url: "https://twitter.com/cosmos" + }, + { + service: "linkedin", + url: "https://www.linkedin.com/company/tendermint/" + }, + { + service: "reddit", + url: "https://reddit.com/r/cosmosnetwork" + }, + { + service: "telegram", + url: "https://t.me/cosmosproject" + }, + { + service: "youtube", + url: "https://www.youtube.com/c/CosmosProject" + } + ], + smallprint: + "The development of the Cosmos project is led primarily by Tendermint Inc., the for-profit entity which also maintains this website. Funding for this development comes primarily from the Interchain Foundation, a Swiss non-profit.", + links: [ + { + title: "Documentation", + children: [ + { + title: "Cosmos SDK", + url: "https://cosmos.network/docs" + }, + { + title: "Cosmos Hub", + url: "https://hub.cosmos.network/" + } + ] + }, + { + title: "Community", + children: [ + { + title: "Cosmos blog", + url: "https://blog.cosmos.network/" + }, + { + title: "Forum", + url: "https://forum.cosmos.network/" + }, + { + title: "Chat", + url: "https://riot.im/app/#/room/#cosmos-sdk:matrix.org" + } + ] + }, + { + title: "Contributing", + children: [ + { + title: "Contributing to the docs", + url: "https://github.com/cosmos/cosmos-sdk/tree/master/docs" + }, + { + title: "Source code on GitHub", + url: "https://github.com/cosmos/cosmos-sdk/" + } + ] + } + ] } }, plugins: [ diff --git a/docs/.vuepress/enhanceApp.js b/docs/.vuepress/enhanceApp.js deleted file mode 100644 index 6deeedeb0558..000000000000 --- a/docs/.vuepress/enhanceApp.js +++ /dev/null @@ -1,8 +0,0 @@ -import axios from 'axios' -import Vue from 'vue' - -Vue.use({ - install (Vue) { - Vue.prototype.$axios = axios.create() - } -}) \ No newline at end of file diff --git a/docs/.vuepress/public/logo-bw.svg b/docs/.vuepress/public/logo-bw.svg new file mode 100644 index 000000000000..f2575260a761 --- /dev/null +++ b/docs/.vuepress/public/logo-bw.svg @@ -0,0 +1,8 @@ + + + + + + + + diff --git a/docs/.vuepress/public/logo.svg b/docs/.vuepress/public/logo.svg new file mode 100644 index 000000000000..95ca6d30da5b --- /dev/null +++ b/docs/.vuepress/public/logo.svg @@ -0,0 +1,18 @@ + + + + + + + + + + + + + + + + + + diff --git a/docs/.vuepress/styles/index.styl b/docs/.vuepress/styles/index.styl new file mode 100644 index 000000000000..66affa704b7b --- /dev/null +++ b/docs/.vuepress/styles/index.styl @@ -0,0 +1,3 @@ +:root + --accent-color #5064fb + --background #161931 \ No newline at end of file diff --git a/docs/DOCS_README.md b/docs/DOCS_README.md index 609044c5192f..96986bef8030 100644 --- a/docs/DOCS_README.md +++ b/docs/DOCS_README.md @@ -1,6 +1,13 @@ # Updating the docs -If you want to open a PR on the Cosmos SDK to update the documentation, please follow the guidelines in the [`CONTRIBUTING.md`](https://github.com/cosmos/cosmos-sdk/tree/master/CONTRIBUTING.md) +If you want to open a PR on the Cosmos SDK to update the documentation, please follow the guidelines in the [`CONTRIBUTING.md`](https://github.com/cosmos/cosmos-sdk/tree/master/CONTRIBUTING.md#updating-documentation) + +## Translating + +- Docs translations live in a `docs/country-code/` folder, where `country-code` stands for the country code of the language used (`cn` for Chinese, `kr` for Korea, `fr` for France, ...). +- Always translate content living on `master`. +- Only content under `/docs/intro/`, `/docs/basics/`, `/docs/core/`, `/docs/building-modules/` and `docs/interfaces` needs to be translated, as well as `docs/README.md`. It is also nice (but not mandatory) to translate `/docs/spec/`. +- Specify the release/tag of the translation in the README of your translation folder. Update the release/tag each time you update the translation. ## Docs Build Workflow @@ -59,34 +66,27 @@ to send users to the GitHub. ## Building Locally -To build and serve the documentation locally, run: +Make sure you are in the `docs` directory and run the following commands: -```bash -npm install -g vuepress +```sh +rm -rf node_modules ``` -then change the following line in the `config.js`: +This command will remove old version of the visual theme and required packages. This step is optional. -```js -base: "/docs/", +```sh +npm install ``` -to: +Install the theme and all dependencies. -```js -base: "/", +```sh +npm run serve ``` -Finally, go up one directory to the root of the repo and run: - -```bash -# from root of repo -vuepress build docs -cd dist/docs -python -m SimpleHTTPServer 8080 -``` +Run `pre` and `post` hooks and start a hot-reloading web-server. See output of this command for the URL (it is often https://localhost:8080). -then navigate to localhost:8080 in your browser. +To build documentation as a static website run `npm run build`. You will find the website in `.vuepress/dist` directory. ## Build RPC Docs diff --git a/docs/README.md b/docs/README.md index aa68d54a99f9..56df7df3c43b 100644 --- a/docs/README.md +++ b/docs/README.md @@ -1,22 +1,82 @@ +--- +layout: index +title: Documentation +description: The Cosmos-SDK is a framework for building blockchain applications in Golang. It is being used to build Gaia, the first implementation of the Cosmos Hub. +features: + - cta: Read + title: Introduction to Cosmos SDK + desc: Learn about all the parts of the Cosmos SDK. + label: 5 min + url: /intro/ + image: spaceship + - cta: Learn + title: SDK Tutorial + desc: Build a complete blockchain application from scratch. + label: 30-40 min + special: dark + h3: View tutorials + url: https://tutorials.cosmos.network/ + image: window +sections: + - title: Introduction + desc: High-level overview of the Cosmos SDK. + url: /intro + icon: introduction + - title: Basics + desc: Anatomy of a blockchain, transaction lifecycle, accounts and more. + icon: basics + url: /basics + - title: SDK Core + desc: Read about the core concepts like `baseapp`, the store, or the server. + icon: core + url: /core + - title: Building Modules + desc: Discover how to build modules for the Cosmos SDK. + icon: modules + url: /building-modules + - title: Interfaces + desc: Build interfaces for Cosmos SDK applications. + icon: interfaces + url: /interfaces + - title: Modules + desc: Explore existing modules to build your application with. + icon: specifications + url: /modules +stack: + - title: Cosmos Hub + desc: Short description about Cosmos Hub, no longer than a few of lines. + color: "#BA3FD9" + label: hub + url: http://hub.cosmos.network + - title: Tendermint + desc: Short description about Tendermint, no longer than a few of lines. + color: "#00BB00" + label: core + url: http://docs.tendermint.com +footer: + newsletter: false +--- + # Cosmos SDK Documentation ## Get Started -- **[SDK Intro](./intro/intro.md)**: High-level overview of the Cosmos SDK. -- **[SDK application tutorial](https://github.com/cosmos/sdk-application-tutorial)**: A tutorial to learn the SDK. It showcases how to build an SDK-based blockchain from scratch, and explains the basic principles of the SDK in the process. - -## Resources +- **[SDK Intro](./intro/overview.md)**: High-level overview of the Cosmos SDK. +- **[SDK Application Tutorial](https://github.com/cosmos/sdk-application-tutorial)**: A tutorial that showcases how to build an SDK-based blockchain from scratch and explains the basic principles of the SDK in the process. -- [Specifications](./spec/README.md): Specifications of modules and other parts of the Cosmos SDK. -- [SDK API Reference](https://godoc.org/github.com/cosmos/cosmos-sdk): Godocs of the Cosmos SDK. -- [REST API spec](https://cosmos.network/rpc/): List of endpoints to interact with a `gaia` full-node through REST. +## Reference -## Creating a new SDK project +- **[Basics](./basics/)**: Documentation on the basic concepts of the Cosmos SDK, like the standard anatomy of an application, the transaction lifecycle and accounts management. +- **[Core](./core/)**: Documentation on the core concepts of the Cosmos SDK, like `baseapp`, the `store` or the `server`. +- **[Building Modules](./building-modules/)**: Important concepts for module developers like `message`s, `keeper`s, `handler`s and `querier`s. +- **[Interfaces](./interfaces/)**: Documentation on building interfaces for Cosmos SDK applications. -To create a new project, you can either: +## Other Resources -- Fork [this repo](https://github.com/cosmos/sdk-application-tutorial/). Do not forget to remove the `nameservice` module from the various files if you don't need it. -- Use community tools like [chainkit](https://github.com/blocklayerhq/chainkit). +- **[Module Directory](../x/)**: Module implementations and their respective documentation. +- **[Specifications](./spec/)**: Specifications of modules and other parts of the Cosmos SDK. +- **[SDK API Reference](https://godoc.org/github.com/cosmos/cosmos-sdk)**: Godocs of the Cosmos SDK. +- **[REST API spec](https://cosmos.network/rpc/)**: List of endpoints to interact with a `gaia` full-node through REST. ## Cosmos Hub @@ -33,6 +93,4 @@ Contact us for information about funding an implementation in another language. See [this file](https://github.com/cosmos/cosmos-sdk/blob/master/docs/DOCS_README.md) for details of the build process and considerations when making changes. -## Version -This documentation is built from the following commit: diff --git a/docs/Screen Shot 2019-10-17 at 15.07.22.png b/docs/Screen Shot 2019-10-17 at 15.07.22.png new file mode 100644 index 000000000000..fc823b91ed22 Binary files /dev/null and b/docs/Screen Shot 2019-10-17 at 15.07.22.png differ diff --git a/docs/architecture/README.MD b/docs/architecture/README.md similarity index 97% rename from docs/architecture/README.MD rename to docs/architecture/README.md index 6b64c9c99402..f5b6a553305d 100644 --- a/docs/architecture/README.MD +++ b/docs/architecture/README.md @@ -1,3 +1,9 @@ +--- +order: false +parent: + order: false +--- + # Architecture Decision Records (ADR) This is a location to record all high-level architecture decisions in the Cosmos-SDK. diff --git a/docs/architecture/readme.md~origin_master-docs b/docs/architecture/readme.md~origin_master-docs new file mode 100644 index 000000000000..f0c07cb68565 --- /dev/null +++ b/docs/architecture/readme.md~origin_master-docs @@ -0,0 +1,5 @@ +--- +order: false +parent: + order: false +--- diff --git a/docs/basics/README.md b/docs/basics/README.md new file mode 100644 index 000000000000..c2e3e519fe76 --- /dev/null +++ b/docs/basics/README.md @@ -0,0 +1,16 @@ +--- +order: false +parent: + order: 2 +--- + +# Basics + +This repository contains reference documentation on the basic concepts of the Cosmos SDK. + +1. [Anatomy of an SDK Application](./app-anatomy.md) +2. [Lifecycle of a transaction](./tx-lifecycle.md) +3. [Accounts](./accounts.md) +4. [Gas and Fees](./gas-fees.md) + +After reading the basics, head on to the [Core Reference](../core/README.md) for more advanced material. \ No newline at end of file diff --git a/docs/basics/accounts.md b/docs/basics/accounts.md new file mode 100644 index 000000000000..ae69c081f549 --- /dev/null +++ b/docs/basics/accounts.md @@ -0,0 +1,134 @@ +--- +order: 3 +synopsis: This document describes the in-built accounts system of the Cosmos SDK. +--- + +# Accounts + +## Pre-requisite Readings {hide} + +- [Anatomy of an SDK Application](./app-anatomy.md) {prereq} + +## Account Definition + +In the Cosmos SDK, an *account* designates a pair of *public key* `PubKey` and *private key* `PrivKey`. The `PubKey` can be derived to generate various `Addresses`, which are used to identify users (among other parties) in the application. `Addresses` are also associated with [`message`s](../building-modules/messages-and-queries.md#messages) to identify the sender of the `message`. The `PrivKey` is used to generate [digital signatures](#signatures) to prove that an `Address` associated with the `PrivKey` approved of a given `message`. + +To derive `PubKey`s and `PrivKey`s, the Cosmos SDK uses a standard called [BIP32](https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki). This standard defines how to build an HD wallet, where a wallet is a set of accounts. At the core of every account, there is a seed, which takes the form of a 12 or 24-words mnemonic. From this mnemonic, it is possible to derive any number of `PrivKey`s using one-way cryptographic function. Then, a `PubKey` can be derived from the `PrivKey`. Naturally, the mnemonic is the most sensitive information, as private keys can always be re-generated if the mnemonic is preserved. + +``` + Account 0 Account 1 Account 2 + ++------------------+ +------------------+ +------------------+ +| | | | | | +| Address 0 | | Address 1 | | Address 2 | +| ^ | | ^ | | ^ | +| | | | | | | | | +| | | | | | | | | +| | | | | | | | | +| + | | + | | + | +| Public key 0 | | Public key 1 | | Public key 2 | +| ^ | | ^ | | ^ | +| | | | | | | | | +| | | | | | | | | +| | | | | | | | | +| + | | + | | + | +| Private key 0 | | Private key 1 | | Private key 2 | +| ^ | | ^ | | ^ | ++------------------+ +------------------+ +------------------+ + | | | + | | | + | | | + +--------------------------------------------------------------------+ + | + | + +---------+---------+ + | | + | Master PrivKey | + | | + +-------------------+ + | + | + +---------+---------+ + | | + | Mnemonic (Seed) | + | | + +-------------------+ +``` + +In the Cosmos SDK, accounts are stored and managed via an object called a [`Keybase`](#keybase). + +## Keybase + +A `Keybase` is an object that stores and manages accounts. In the Cosmos SDK, a `Keybase` implementation follows the `Keybase` interface: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/crypto/keys/types.go#L13-L86 + +The default implementation of `Keybase` of the Cosmos SDK is `dbKeybase`. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/crypto/keys/keybase.go + +A few notes on the `Keybase` methods as implemented in `dbKeybase`: + +- `Sign(name, passphrase string, msg []byte) ([]byte, crypto.PubKey, error)` strictly deals with the signature of the `message` bytes. Some preliminary work should be done beforehand to prepare and encode the `message` into a canonical `[]byte` form. See an example of `message` preparation from the `auth` module. Note that signature verification is not implemented in the SDK by default. It is deferred to the [`anteHandler`](#antehandler). + +++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/x/auth/types/txbuilder.go#L176-L209 +- `CreateMnemonic(name string, language Language, passwd string, algo SigningAlgo) (info Info, seed string, err error)` creates a new mnemonic and prints it in the logs, but it **does not persist it on disk**. +- `CreateAccount(name, mnemonic, bip39Passwd, encryptPasswd string, account uint32, index uint32) (Info, error)` creates a new account based on the [`bip44 path`](https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki) and persists it on disk (note that the `PrivKey` is [encrypted with a passphrase before being persisted](https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/crypto/keys/mintkey/mintkey.go), it is **never stored unencrypted**). In the context of this method, the `account` and `address` parameters refer to the segment of the BIP44 derivation path (e.g. `0`, `1`, `2`, ...) used to derive the `PrivKey` and `PubKey` from the mnemonic (note that given the same mnemonic and `account`, the same `PrivKey` will be generated, and given the same `account` and `address`, the same `PubKey` and `Address` will be generated). Finally, note that the `CreateAccount` method derives keys and addresses using `secp256k1` as implemented in the [Tendermint library](https://github.com/tendermint/tendermint/tree/bc572217c07b90ad9cee851f193aaa8e9557cbc7/crypto/secp256k1). As a result, it only works for creating account keys and addresses, not consensus keys. See [`Addresses`](#addresses) for more. + +The current implementation of `dbKeybase` is basic and does not offer on-demand locking. If an instance of `dbKeybase` is created, the underlying `db` is locked meaning no other process can access it besides the one in which it was instantiated. This is the reason why the default SDK client uses another implementation of the `Keybase` interface called `lazyKeybase`: + + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/crypto/keys/lazy_keybase.go + +`lazyKeybase` is simple wrapper around `dbKeybase` which locks the database only when operations are to be performed and unlocks it immediately after. With the `lazyKeybase`, it is possible for the [command-line interface](../interfaces/cli.md) to create a new account while the [rest server](../interfaces/rest.md) is running. It is also possible to pipe multiple CLI commands. + +## Addresses and PubKeys + +`Addresses` and `PubKey`s are both public information that identify actors in the application. There are 3 main types of `Addresses`/`PubKeys` available by default in the Cosmos SDK: + +- Addresses and Keys for **accounts**, which identify users (e.g. the sender of a `message`). They are derived using the **`secp256k1`** curve. +- Addresses and Keys for **validator operators**, which identify the operators of validators. They are derived using the **`secp256k1`** curve. +- Addresses and Keys for **consensus nodes**, which identify the validator nodes participating in consensus. They are derived using the **`ed25519`** curve. + +| | Address bech32 Prefix | Pubkey bech32 Prefix | Curve | Address byte length | Pubkey byte length | +|--------------------|-----------------------|----------------------|-------------|---------------------|--------------------| +| Accounts | cosmos | cosmospub | `secp256k1` | `20` | `33` | +| Validator Operator | cosmosvaloper | cosmosvaloperpub | `secp256k1` | `20` | `33` | +| Consensus Nodes | cosmosvalcons | cosmosvalconspub | `ed25519` | `20` | `32` | + +### PubKeys + +`PubKey`s used in the Cosmos SDK follow the `Pubkey` interface defined in tendermint's `crypto` package: + ++++ https://github.com/tendermint/tendermint/blob/bc572217c07b90ad9cee851f193aaa8e9557cbc7/crypto/crypto.go#L22-L27 + +For `secp256k1` keys, the actual implementation can be found [here](https://github.com/tendermint/tendermint/blob/bc572217c07b90ad9cee851f193aaa8e9557cbc7/crypto/secp256k1/secp256k1.go#L140). For `ed25519` keys, it can be found [here](https://github.com/tendermint/tendermint/blob/bc572217c07b90ad9cee851f193aaa8e9557cbc7/crypto/ed25519/ed25519.go#L135). + +Note that in the Cosmos SDK, `Pubkeys` are not manipulated in their raw form. Instead, they are double encoded using [`Amino`](../core/encoding.md#amino) and [`bech32`](https://en.bitcoin.it/wiki/Bech32). In the SDK is done by first calling the `Bytes()` method on the raw `Pubkey` (which applies amino encoding), and then the `ConvertAndEncode` method of `bech32`. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/address.go#L579-L729 + +### Addresses + +The Cosmos SDK comes by default with 3 types of addresses: + +- `AccAddress` for accounts. +- `ValAddress` for validator operators. +- `ConsAddress` for validator nodes. + +Each of these address types are an alias for an hex-encoded `[]byte` array of length 20. Here is the standard way to obtain an address `aa` from a `Pubkey pub`: + +```go +aa := sdk.AccAddress(pub.Address().Bytes()) +``` + +These addresses implement the `Address` interface: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/address.go#L71-L80 + +Of note, the `Marhsal()` and `Bytes()` method both return the same raw `[]byte` form of the address, the former being needed for Protobuff compatibility. Also, the `String()` method is used to return the `bech32` encoded form of the address, which should be the only address format with which end-user interract. Next is an example: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/address.go#L229-L243 + +## Next {hide} + +Learn about [gas and fees](./gas-fees.md) {hide} \ No newline at end of file diff --git a/docs/basics/app-anatomy.md b/docs/basics/app-anatomy.md index 2f15fe626f43..e982306f342d 100644 --- a/docs/basics/app-anatomy.md +++ b/docs/basics/app-anatomy.md @@ -1,39 +1,15 @@ -# Anatomy of an SDK Application +--- +order: 1 +synopsis: "This document describes the core parts of a Cosmos SDK application. Throughout the document, a placeholder application named `app` will be used." +--- -## Pre-requisite reading +# Anatomy of an SDK Application -- [High-level overview of the architecture of an SDK application](../intro/sdk-app-architecture.md) -- [Cosmos SDK design overview](../intro/sdk-design.md) -## Synopsis - -This document describes the core parts of a Cosmos SDK application. The placeholder name for this application will be `app`. - -- [Node Client](#node-client) -- [Core Application File](#core-application-file) -- [Modules](#modules) -- [Interfaces](#interfaces) -- [Dependencies and Makefile](#dependencies-and-makefile) - -The core parts listed above will generally translate to the following directory tree: - -``` -./app -├── cmd/ -│ ├── appd -│ └── appcli -├── app.go -├── x/ -│ ├── auth -│ ├── ... -│ └── bank -├── go.mod -└── Makefile -``` ## Node Client -The Daemon, or Full-Node Client, is the core process of an SDK-based blockchain. Participants in the network run this process to initialize their state-machine, connect with other full-nodes and update their state-machine as new blocks come in. +The Daemon, or [Full-Node Client](../core/node.md), is the core process of an SDK-based blockchain. Participants in the network run this process to initialize their state-machine, connect with other full-nodes and update their state-machine as new blocks come in. ``` ^ +-------------------------------+ ^ @@ -53,15 +29,11 @@ Blockchain Node | | Consensus | | v +-------------------------------+ v ``` -The blockchain full-node presents itself as a binary, generally suffixed by `-d` for "daemon" (e.g. `appd` for `app` or `gaiad` for `gaia`). This binary is built by running a simple `main.go` function placed in `cmd/appd/`. This operation usually happens through the [Makefile](#dependencies-and-makefile). - -To learn more about the `main.go` function, [click here](./node.md#main-function). +The blockchain full-node presents itself as a binary, generally suffixed by `-d` for "daemon" (e.g. `appd` for `app` or `gaiad` for `gaia`). This binary is built by running a simple [`main.go`](../core/node.md#main-function) function placed in `./cmd/appd/`. This operation usually happens through the [Makefile](#dependencies-and-makefile). -Once the main binary is built, the node can be started by running the `start` command. The core logic behind the `start` command is implemented in the SDK itself in the [`/server/start.go`](https://github.com/cosmos/cosmos-sdk/blob/master/server/start.go) file. The main [`start` command function](https://github.com/cosmos/cosmos-sdk/blob/master/server/start.go#L31) takes a [`context`](https://godoc.org/github.com/cosmos/cosmos-sdk/client/context) and [`appCreator`](<#constructor-function-(`appCreator`)>) as arguments. The `appCreator` is a constructor function for the SDK application, and is used in the starting process of the full-node. +Once the main binary is built, the node can be started by running the [`start` command](../core/node.md#start-command). This command function primarily does three things: -The `start` command function primarily does three things: - -1. Create an instance of the state-machine defined in [`app.go`](#core-application-file) using the `appCreator`. +1. Create an instance of the state-machine defined in [`app.go`](#core-application-file). 2. Initialize the state-machine with the latest known state, extracted from the `db` stored in the `~/.appd/data` folder. At this point, the state-machine is at height `appBlockHeight`. 3. Create and start a new Tendermint instance. Among other things, the node will perform a handshake with its peers. It will get the latest `blockHeight` from them, and replay blocks to sync to this height if it is greater than the local `appBlockHeight`. If `appBlockHeight` is `0`, the node is starting from genesis and Tendermint sends an `InitChain` message via the ABCI to the `app`, which triggers the [`InitChainer`](#initchainer). @@ -73,104 +45,135 @@ In general, the core of the state-machine is defined in a file called `app.go`. The first thing defined in `app.go` is the `type` of the application. It is generally comprised of the following parts: -- **A reference to [`baseapp`](./baseapp.md).** The custom application defined in `app.go` is an extension of the `baseapp` type. `baseapp` implements most of the core logic for the application, including all the [ABCI methods](https://tendermint.com/docs/spec/abci/abci.html#overview) and the routing logic. When a transaction is relayed by Tendermint to the application, the latter uses `baseapp`'s methods to route them to the appropriate module. -- **A list of store keys**. The [store](./store.md), which contains the entire state, is implemented as a multistore (i.e. a store of stores) in the Cosmos SDK. Each module uses one or multiple stores in the multistore to persist their part of the state. These stores can be accessed with specific keys that are declared in the `app` type. These keys, along with the `keepers`, are at the heart of the [object-capabilities model](../intro/ocap.md) of the Cosmos SDK. -- **A list of module's `keepers`.** Each module defines an abstraction called `keeper`, which handles reads and writes for this module's store(s). The `keeper`'s methods of one module can be called from other modules (if authorized), which is why they are declared in the application's type and exported as interfaces to other modules so that they are only allowed to access the authorized functions. -- **A reference to a `codec`.** The Cosmos SDK gives developers the freedom to choose the encoding framework for their application. The application's `codec` is used to serialize and deserialize data structures in order to store them, as stores can only persist `[]bytes`. The `codec` must be deterministic. The default codec is [amino](./amino.md). -- **A reference to a [module manager](./modules.md#module-manager)**. The module manager is an object that contains a list of the application's module. It facilitates operations related to these modules, like registering [`routes`](./baseapp.md#routing), [query routes](#./baseapp.md#query-routing) or setting the order of execution between modules for various functions like [`InitChainer`](#initchainer), [`BeginBlocker` and `EndBlocker`](#beginblocker-and-endblocker). +- **A reference to [`baseapp`](../core/baseapp.md).** The custom application defined in `app.go` is an extension of `baseapp`. When a transaction is relayed by Tendermint to the application, `app` uses `baseapp`'s methods to route them to the appropriate module. `baseapp` implements most of the core logic for the application, including all the [ABCI methods](https://tendermint.com/docs/spec/abci/abci.html#overview) and the [routing logic](../core/baseapp.md#routing). +- **A list of store keys**. The [store](../core/store.md), which contains the entire state, is implemented as a [`multistore`](../core/store.md#multistore) (i.e. a store of stores) in the Cosmos SDK. Each module uses one or multiple stores in the multistore to persist their part of the state. These stores can be accessed with specific keys that are declared in the `app` type. These keys, along with the `keepers`, are at the heart of the [object-capabilities model](../core/ocap.md) of the Cosmos SDK. +- **A list of module's `keeper`s.** Each module defines an abstraction called [`keeper`](../building-modules/keeper.md), which handles reads and writes for this module's store(s). The `keeper`'s methods of one module can be called from other modules (if authorized), which is why they are declared in the application's type and exported as interfaces to other modules so that the latter can only access the authorized functions. +- **A reference to a [`codec`](../core/encoding.md).** The application's `codec` is used to serialize and deserialize data structures in order to store them, as stores can only persist `[]bytes`. The `codec` must be deterministic. The default codec is [amino](../core/encoding.md). +- **A reference to a [module manager](../building-modules/module-manager.md#manager)** and a [basic module manager](../building-modules/module-manager.md#basicmanager). The module manager is an object that contains a list of the application's module. It facilitates operations related to these modules, like registering [`routes`](../core/baseapp.md#routing), [query routes](../core/baseapp.md#query-routing) or setting the order of execution between modules for various functions like [`InitChainer`](#initchainer), [`BeginBlocker` and `EndBlocker`](#beginblocker-and-endblocker). + +See an example of application type definition from [`gaia`](https://github.com/cosmos/gaia) -You can see an example of application type definition [here](https://github.com/cosmos/gaia/blob/master/app/app.go#L73-L107). ++++ https://github.com/cosmos/gaia/blob/5bc422e6868d04747e50b467e8eeb31ae2fe98a3/app/app.go#L87-L115 ### Constructor Function -This function constructs a new application of the type defined above. It is called every time the full-node is started with the [`start`](https://github.com/cosmos/cosmos-sdk/blob/master/server/start.go#L117) command. Here are the main actions performed by this function: +This function constructs a new application of the type defined in the section above. It must fulfill the `AppCreator` signature in order to be used in the [`start` command](../core/node.md#start-command) of the application's daemon command. ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/server/constructors.go#L20 + +Here are the main actions performed by this function: + +- Instantiate a new [`codec`](../core/encoding.md) and initialize the `codec` of each of the application's module using the [basic manager](../building-modules/module-manager.md#basicmanager) - Instantiate a new application with a reference to a `baseapp` instance, a codec and all the appropriate store keys. -- Instantiate all the [`keeper`s](#keeper) defined in the application's `type` using the `NewKeeper` function of each of the application's modules. Note that `keepers` must be instantiated in the correct order, as the `NewKeeper` of one module might require a reference to another module's `keeper`. -- Instantiate the application's [module manager](./module-manager.md) with the [`AppModule`](#application-module-interface) object of each of the application's modules. -- With the module manager, initialize the application's [`routes`](./baseapp.md#routing) and [query routes](./baseapp.md#query-routing). When a transaction is relayed to the application by Tendermint via the ABCI, it is routed to the appropriate module's [`handler`](#handler) using the routes defined here. Likewise, when a query is received by the application, it is routed to the appropriate module's [`querier`](#querier) using the query routes defined here. -- With the module manager, register the [application's modules' invariants](./invariants.md). Invariants are variables (e.g. total supply of a token) that are evaluated at the end of each block. The process of checking invariants is done via a special module called the [`InvariantsRegistry`](./invariants.md#invariant-registry). The value of the invariant should be equal to a predicted value defined in the module. Should the value be different than the predicted one, special logic defined in the invariant registry will be triggered (usually the chain is halted). This is useful to make sure no critical bug goes unnoticed and produces long-lasting effects that would be hard to fix. -- With the module manager, set the order of execution between the `InitGenesis`, `BegingBlocker` and `EndBlocker` functions of each of the [application's modules](#application-module-interface). Note that not all modules implement these functions. +- Instantiate all the [`keeper`s](#keeper) defined in the application's `type` using the `NewKeeper` function of each of the application's modules. Note that `keepers` must be instantiated in the correct order, as the `NewKeeper` of one module might require a reference to another module's `keeper`. +- Instantiate the application's [module manager](../building-modules/module-manager.md#manager) with the [`AppModule`](#application-module-interface) object of each of the application's modules. +- With the module manager, initialize the application's [`routes`](../core/baseapp.md#routing) and [query routes](../core/baseapp.md#query-routing). When a transaction is relayed to the application by Tendermint via the ABCI, it is routed to the appropriate module's [`handler`](#handler) using the routes defined here. Likewise, when a query is received by the application, it is routed to the appropriate module's [`querier`](#querier) using the query routes defined here. +- With the module manager, register the [application's modules' invariants](../building-modules/invariants.md). Invariants are variables (e.g. total supply of a token) that are evaluated at the end of each block. The process of checking invariants is done via a special module called the [`InvariantsRegistry`](../building-modules/invariants.md#invariant-registry). The value of the invariant should be equal to a predicted value defined in the module. Should the value be different than the predicted one, special logic defined in the invariant registry will be triggered (usually the chain is halted). This is useful to make sure no critical bug goes unnoticed and produces long-lasting effects that would be hard to fix. +- With the module manager, set the order of execution between the `InitGenesis`, `BegingBlocker` and `EndBlocker` functions of each of the [application's modules](#application-module-interface). Note that not all modules implement these functions. - Set the remainer of application's parameters: - - [`InitChainer`](#initchainer): used to initialize the application when it is first started. - - [`BeginBlocker`, `EndBlocker`](#beginblocker-and-endlbocker): called at the beginning and the end of every block). - - [`anteHandler`](#baseapp.md#antehandler): used to handle fees and signature verification. -- Mount the stores. -- Return the application. + + [`InitChainer`](#initchainer): used to initialize the application when it is first started. + + [`BeginBlocker`, `EndBlocker`](#beginblocker-and-endlbocker): called at the beginning and the end of every block). + + [`anteHandler`](../core/baseapp.md#antehandler): used to handle fees and signature verification. +- Mount the stores. +- Return the application. Note that this function only creates an instance of the app, while the actual state is either carried over from the `~/.appd/data` folder if the node is restarted, or generated from the genesis file if the node is started for the first time. -You can see an example of application constructor [here](https://github.com/cosmos/gaia/blob/master/app/app.go#L110-L222). +See an example of application constructor from [`gaia`](https://github.com/cosmos/gaia): + ++++ https://github.com/cosmos/gaia/blob/f41a660cdd5bea173139965ade55bd25d1ee3429/app/app.go#L110-L222 ### InitChainer -The `InitChainer` is a function that initializes the state of the application from a [genesis file](./genesis.md) (i.e. token balances of genesis accounts). It is called when the application receives the `InitChain` message from the Tendermint engine, which happens when the node is started at `appBlockHeight == 0` (i.e. on genesis). The application must set the `InitChainer` in its constructor via the [`SetInitChainer`](https://godoc.org/github.com/cosmos/cosmos-sdk/baseapp#BaseApp.SetInitChainer) method. +The `InitChainer` is a function that initializes the state of the application from a genesis file (i.e. token balances of genesis accounts). It is called when the application receives the `InitChain` message from the Tendermint engine, which happens when the node is started at `appBlockHeight == 0` (i.e. on genesis). The application must set the `InitChainer` in its [constructor](#constructor-function) via the [`SetInitChainer`](https://godoc.org/github.com/cosmos/cosmos-sdk/baseapp#BaseApp.SetInitChainer) method. -In general, the `InitChainer` is mostly composed of the `InitGenesis` function of each of the application's modules. This is done by calling the `InitGenesis` function of the module manager, which in turn will call the `InitGenesis` function of each of the modules it contains. Note that the order in which the modules' `InitGenesis` functions must be called has to be set in the module manager using the `SetOrderInitGenesis` method. This is done in the [application's constructor](#application-constructor), and the `SetOrderInitGenesis` has to be called before the `SetInitChainer`. +In general, the `InitChainer` is mostly composed of the [`InitGenesis`](../building-modules/genesis.md#initgenesis) function of each of the application's modules. This is done by calling the `InitGenesis` function of the module manager, which in turn will call the `InitGenesis` function of each of the modules it contains. Note that the order in which the modules' `InitGenesis` functions must be called has to be set in the module manager using the [module manager's](../building-modules/module-manager.md) `SetOrderInitGenesis` method. This is done in the [application's constructor](#application-constructor), and the `SetOrderInitGenesis` has to be called before the `SetInitChainer`. -You can see an example of an `InitChainer` [here](https://github.com/cosmos/gaia/blob/master/app/app.go#L235-L239). +See an example of an `InitChainer` from [`gaia`](https://github.com/cosmos/gaia): + ++++ https://github.com/cosmos/gaia/blob/f41a660cdd5bea173139965ade55bd25d1ee3429/app/app.go#L235-L239 ### BeginBlocker and EndBlocker -The SDK offers developers the possibility to implement automatic execution of code as part of their application. This is implemented through two function called `BeginBlocker` and `EndBlocker`. They are called when the application receives respectively the `BeginBlock` and `EndBlock` messages from the Tendermint engine, which happens at the beginning and at the end of each block. The application must set the `BeginBlocker` and `EndBlocker` in its constructor via the [`SetBeginBlocker`](https://godoc.org/github.com/cosmos/cosmos-sdk/baseapp#BaseApp.SetBeginBlocker) and [`SetEndBlocker`](https://godoc.org/github.com/cosmos/cosmos-sdk/baseapp#BaseApp.SetEndBlocker) methods. +The SDK offers developers the possibility to implement automatic execution of code as part of their application. This is implemented through two function called `BeginBlocker` and `EndBlocker`. They are called when the application receives respectively the `BeginBlock` and `EndBlock` messages from the Tendermint engine, which happens at the beginning and at the end of each block. The application must set the `BeginBlocker` and `EndBlocker` in its [constructor](#constructor-function) via the [`SetBeginBlocker`](https://godoc.org/github.com/cosmos/cosmos-sdk/baseapp#BaseApp.SetBeginBlocker) and [`SetEndBlocker`](https://godoc.org/github.com/cosmos/cosmos-sdk/baseapp#BaseApp.SetEndBlocker) methods. -In general, the `BeginBlocker` and `EndBlocker` functions are mostly composed of the `BeginBlock` and `EndBlock` functions of each of the application's modules. This is done by calling the `BeginBlock` and `EndBlock` functions of the module manager, which in turn will call the `BeginBLock` and `EndBlock` functions of each of the modules it contains. Note that the order in which the modules' `BegingBlock` and `EndBlock` functions must be called has to be set in the module manager using the `SetOrderBeginBlock` and `SetOrderEndBlock` methods respectively. This is done in the [application's constructor](#application-constructor), and the `SetOrderBeginBlock` and `SetOrderEndBlock` methods have to be called before the `SetBeginBlocker` and `SetEndBlocker` functions. +In general, the `BeginBlocker` and `EndBlocker` functions are mostly composed of the [`BeginBlock` and `EndBlock`](../building-modules/beginblock-endblock.md) functions of each of the application's modules. This is done by calling the `BeginBlock` and `EndBlock` functions of the module manager, which in turn will call the `BeginBLock` and `EndBlock` functions of each of the modules it contains. Note that the order in which the modules' `BegingBlock` and `EndBlock` functions must be called has to be set in the module manager using the `SetOrderBeginBlock` and `SetOrderEndBlock` methods respectively. This is done via the [module manager](../building-modules/module-manager.md) in the [application's constructor](#application-constructor), and the `SetOrderBeginBlock` and `SetOrderEndBlock` methods have to be called before the `SetBeginBlocker` and `SetEndBlocker` functions. -As a sidenote, it is important to remember that application-specific blockchains are deterministic. Developers must be careful not to introduce non-determinism in `BeginBlocker` or `EndBlocker`, and must also be careful not to make them too computationally expensive, as gas does not constrain the cost of `BeginBlocker` and `EndBlocker` execution. +As a sidenote, it is important to remember that application-specific blockchains are deterministic. Developers must be careful not to introduce non-determinism in `BeginBlocker` or `EndBlocker`, and must also be careful not to make them too computationally expensive, as [gas](./gas-fees.md) does not constrain the cost of `BeginBlocker` and `EndBlocker` execution. -You can see an example of `BeginBlocker` and `EndBlocker` functions [here](https://github.com/cosmos/gaia/blob/master/app/app.go#L224-L232). +See an example of `BeginBlocker` and `EndBlocker` functions from [`gaia`](https://github.com/cosmos/gaia) + ++++ https://github.com/cosmos/gaia/blob/f41a660cdd5bea173139965ade55bd25d1ee3429/app/app.go#L224-L232 ### Register Codec -The `MakeCodec` function is the last important function of the `app.go` file. The goal of this function is to instantiate a codec `cdc` (e.g. amino) initialize the codec of the SDK and each of the application's modules using the `RegisterCodec` function. +The `MakeCodec` function is the last important function of the `app.go` file. The goal of this function is to instantiate a [codec `cdc`](../core/encoding.md) (e.g. amino) initialize the codec of the SDK and each of the application's modules using the `RegisterCodec` function. -To register the application's modules, the `MakeCodec` function calls `RegisterCodec` on `ModuleBasics`. `ModuleBasics` is a basic manager which lists all of the application's modules. It is instantiated in the `init()` function, and only serves to easily register non-dependent elements of application's modules (such as codec). To learn more about the basic module manager,. +To register the application's modules, the `MakeCodec` function calls `RegisterCodec` on `ModuleBasics`. `ModuleBasics` is a [basic manager](../building-modules/module-manager.md#basicmanager) which lists all of the application's modules. It is instanciated in the `init()` function, and only serves to easily register non-dependant elements of application's modules (such as codec). To learn more about the basic module manager, click [here](../building-modules/module-manager.md#basicmanager). -You can see an example of a `MakeCodec` [here](https://github.com/cosmos/gaia/blob/master/app/app.go#L64-L70) +See an example of a `MakeCodec` from [`gaia`](https://github.com/cosmos/gaia): + ++++ https://github.com/cosmos/gaia/blob/f41a660cdd5bea173139965ade55bd25d1ee3429/app/app.go#L64-L70 ## Modules -Modules are the heart and soul of an SDK application. They can be considered as state-machines within the state-machine. When a transaction is relayed from the underlying Tendermint engine via the ABCI to the application, it is routed by `baseapp` to the appropriate module in order to be processed. This paradigm enables developers to easily build complex state-machines, as most of the modules they need often already exist. For developers, most of the work involved in building an SDK application revolves around building custom modules required by their application that do not exist, and integrating them with modules that do already exist into one coherent application. In the application directory, the standard practice is to store modules in the `x/` folder (not to be confused with the SDK's `x/` folder, which contains already-built modules). +[Modules](../building-modules/intro.md) are the heart and soul of SDK applications. They can be considered as state-machines within the state-machine. When a transaction is relayed from the underlying Tendermint engine via the ABCI to the application, it is routed by [`baseapp`](../core/baseapp.md) to the appropriate module in order to be processed. This paradigm enables developers to easily build complex state-machines, as most of the modules they need often already exist. For developers, most of the work involved in building an SDK application revolves around building custom modules required by their application that do not exist yet, and integrating them with modules that do already exist into one coherent application. In the application directory, the standard practice is to store modules in the `x/` folder (not to be confused with the SDK's `x/` folder, which contains already-built modules). ### Application Module Interface -Modules implement two interfaces defined in the Cosmos SDK, [`AppModuleBasic`](https://github.com/cosmos/cosmos-sdk/blob/master/types/module/module.go#L44-L57) and [`AppModule`](https://github.com/cosmos/cosmos-sdk/blob/master/types/module/module.go#L44-L57). The former implements basic non-dependant elements of the module, such as the `codec`, while the latter handles the bulk of the module methods (including methods that require references to other modules' `keeper`s). Both the `AppModule` and `AppModuleBasic` types are defined in a file called `./module.go`. - -`AppModule` exposes a collection of useful methods on the module that facilitates the composition of modules into a coherent application. Important methods include: +Modules must implement [interfaces](../building-modules/module-manager.md#application-module-interfaces) defined in the Cosmos SDK, [`AppModuleBasic`](../building-modules/module-manager.md#appmodulebasic) and [`AppModule`](../building-modules/module-manager.md#appmodule). The former implements basic non-dependant elements of the module, such as the `codec`, while the latter handles the bulk of the module methods (including methods that require references to other modules' `keeper`s). Both the `AppModule` and `AppModuleBasic` types are defined in a file called `./module.go`. -- `Route()` and `QueryRoute()`: These methods the name of the route and querier route for the module, for [messages](#message-types) to be routed to the module's [`handler`](#handler) and queries to be routes to the module's [`querier`](#querier). -- `NewHandler()` and `NewQuerierHandler()`: These methods return a `handler` and `querierHandler` respectively, in order to process a message or a query once they are routed. -- `BeginBlock()`, `EndBlock()` and `InitGenesis()`: These methods are executed respectively at the beginning of each block, at the end of each block and at the start of the chain. They implement special logic the module requires to be triggered during those events. For example, the `EndBlock` function is frequently used by modules where voting occurs to tally the result of the votes. -- `RegisterInvariants()`: This method registers the [invariants](./invariants.md) for the module. Invariants are checked at the end of every block to make sure no unpredicted behaviour is occuring. -- `AppModule`'s methods are called from the `module manager`, which manages the application's collection of modules. +`AppModule` exposes a collection of useful methods on the module that facilitates the composition of modules into a coherent application. These methods are are called from the `module manager`(../building-modules/module-manager.md#manager), which manages the application's collection of modules. ### Message Types -A message is a custom type defined by each module that implements the [`message`](https://github.com/cosmos/cosmos-sdk/blob/master/types/tx_msg.go#L8-L29) interface. Each `transaction` contains one or multiple `messages`. When a valid block of transactions is received by the full-node, Tendermint relays each one to the application via [`DeliverTx`](https://tendermint.com/docs/app-dev/abci-spec.html#delivertx). Then, the application handles the transaction: +[`Message`s](../building-modules/messages-and-queries.md#messages) are objects defined by each module that implement the [`message`](../building-modules/messages-and-queries.md#messages) interface. Each [`transaction`](../core/transactions.md) contains one or multiple `messages`. -1. Upon receiving the transaction, the application first unmarshals it from `[]bytes`. -2. Then, it verifies a few things about the transaction like [fee payment and signatures](#accounts-fees-gas.md) before extracting the message(s) contained in the transaction. -3. With the [`Type()`](https://github.com/cosmos/cosmos-sdk/blob/master/types/tx_msg.go#L16) method, `baseapp` is able to know which modules defines the message. It is then able to route it to the appropriate module's [handler](#handler) in order for the message to be processed. -4. If the message is successfully processed, the state is updated. +When a valid block of transactions is received by the full-node, Tendermint relays each one to the application via [`DeliverTx`](https://tendermint.com/docs/app-dev/abci-spec.html#delivertx). Then, the application handles the transaction: + +1. Upon receiving the transaction, the application first unmarshalls it from `[]bytes`. +2. Then, it verifies a few things about the transaction like [fee payment and signatures](#gas-fees.md#antehandler) before extracting the message(s) contained in the transaction. +3. With the `Type()` method of the `message`, `baseapp` is able to route it to the appropriate module's [`handler`](#handler) in order for it to be processed. +4. If the message is successfully processed, the state is updated. For a more detailed look at a transaction lifecycle, click [here](./tx-lifecycle.md). -Module developers create custom message types when they build their own module. The general practice is to prefix the type declaration of the message with `Msg`. For example, the message type [`MsgSend`](https://github.com/cosmos/cosmos-sdk/blob/master/x/bank/types/msgs.go#L10-L15) allows users to transfer tokens. It is processed by the handler of the `bank` module, which ultimately calls the `keeper` of the `auth` module in order to update the state. +Module developers create custom message types when they build their own module. The general practice is to prefix the type declaration of the message with `Msg`. For example, the message type `MsgSend` allows users to transfer tokens: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/x/bank/internal/types/msgs.go#L10-L15 + +It is processed by the `handler` of the `bank` module, which ultimately calls the `keeper` of the `auth` module in order to update the state. ### Handler -The `handler` refers to the part of the module responsible for processing the message after it is routed by `baseapp`. `handler` functions of modules (except those of the `auth` module) are only executed if the transaction is relayed from Tendermint by the `DeliverTx` ABCI message. If the transaction is relayed by `CheckTx`, only stateless checks and fee-related (i.e. `auth` module-related) stateful checks are performed. To better understand the difference between `DeliverTx`and `CheckTx`, as well as the difference between stateful and stateless checks, click [here](./tx-lifecycle.md). +The [`handler`](../building-modules/handler.md) refers to the part of the module responsible for processing the `message` after it is routed by `baseapp`. `handler` functions of modules are only executed if the transaction is relayed from Tendermint by the `DeliverTx` ABCI message. If the transaction is relayed by `CheckTx`, only stateless checks and fee-related stateful checks are performed. To better understand the difference between `DeliverTx`and `CheckTx`, as well as the difference between stateful and stateless checks, click [here](./tx-lifecycle.md). + +The `handler` of a module is generally defined in a file called `handler.go` and consists of: -The handler of a module is generally defined in a file called `handler.go` and consists of: +- A **switch function** `NewHandler` to route the message to the appropriate `handler` function. This function returns a `handler` function, and is registered in the [`AppModule`](#application-module-interface) to be used in the application's module manager to initialize the [application's router](../core/baseapp.md#routing). Next is an example of such a switch from the [nameservice tutorial](https://github.com/cosmos/sdk-tutorials/tree/master/nameservice) + +++ https://github.com/cosmos/sdk-tutorials/blob/master/nameservice/x/nameservice/handler.go#L12-L26 +- **One handler function for each message type defined by the module**. Developers write the message processing logic in these functions. This generally involves doing stateful checks to ensure the message is valid and calling [`keeper`](#keeper)'s methods to update the state. -- A **switch function** `NewHandler` to route the message to the appropriate handler function. This function returns a `handler` function, and is registered in the [`AppModule`](#application-module-interface) to be used in the application's module manager to initialize the application's router. See an example of such a switch [here](https://github.com/cosmos/sdk-application-tutorial/blob/master/x/nameservice/handler.go#L10-L22). -- **One handler function for each message type defined by the module**. Developers write the message processing logic in these functions. This generally involves doing stateful checks to ensure the message is valid and calling [`keeper`](#keeper)'s methods to update the state. +Handler functions return a result of type `sdk.Result`, which informs the application on whether the message was successfully processed: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/result.go#L15-L40 + +### Querier + +[`Queriers`](../building-modules/querier.md) are very similar to `handlers`, except they serve user queries to the state as opposed to processing transactions. A [query](../building-modules/messages-and-queries.md#queries) is initiated from an [interface](#interfaces) by an end-user who provides a `queryRoute` and some `data`. The query is then routed to the correct application's `querier` by `baseapp`'s `handleQueryCustom` method using `queryRoute`: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/baseapp/abci.go#L395-L453 + +The `Querier` of a module is defined in a file called `querier.go`, and consists of: + +- A **switch function** `NewQuerier` to route the query to the appropriate `querier` function. This function returns a `querier` function, and is is registered in the [`AppModule`](#application-module-interface) to be used in the application's module manager to initialize the [application's query router](../core/baseapp.md#query-routing). See an example of such a switch from the [nameservice tutorial](https://github.com/cosmos/sdk-tutorials/tree/master/nameservice): + +++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/x/nameservice/internal/keeper/querier.go#L19-L32 +- **One querier function for each data type defined by the module that needs to be queryable**. Developers write the query processing logic in these functions. This generally involves calling [`keeper`](#keeper)'s methods to query the state and marshalling it to JSON. -Handler functions return a result of type [`sdk.Result`](https://github.com/cosmos/cosmos-sdk/blob/master/types/result.go#L14-L37), which informs the application on whether the message was successfully processed. ### Keeper -`Keepers` are the gatekeepers of their module's store(s). To read or write in a module's store, it is mandatory to go through one of its `keeper`'s methods. This is ensured by the [object-capabilities](./ocap.md) model of the Cosmos SDK. Only objects that hold the key to a store can access it, and only the module's `keeper` should hold the key(s) to the module's store(s). +[`Keepers`](../building-modules/keeper.md) are the gatekeepers of their module's store(s). To read or write in a module's store, it is mandatory to go through one of its `keeper`'s methods. This is ensured by the [object-capabilities](../core/ocap.md) model of the Cosmos SDK. Only objects that hold the key to a store can access it, and only the module's `keeper` should hold the key(s) to the module's store(s). `Keepers` are generally defined in a file called `keeper.go`. It contains the `keeper`'s type definition and methods. @@ -180,18 +183,7 @@ The `keeper` type definition generally consists of: - Reference to **other module's `keepers`**. Only needed if the `keeper` needs to access other module's store(s) (either to read or write from them). - A reference to the application's **codec**. The `keeper` needs it to marshal structs before storing them, or to unmarshal them when it retrieves them, because stores only accept `[]bytes` as value. -Along with the type definition, the next important component of the `keeper.go` file is the `keeper`'s constructor function, `NewKeeper`. This function instantiates a new `keeper` of the type defined above, with a `codec`, store `keys` and potentially references to other modules' `keeper`s as parameters. The `NewKeeper` function is called from the [application's constructor](#constructor-function). - -The rest of the file defines the `keeper`'s methods, primarily getters and setters. You can check an example of a `keeper` implementation [here](https://github.com/cosmos/sdk-application-tutorial/blob/master/x/nameservice/keeper.go). - -### Querier - -`Queriers` are very similar to `handlers`, except they serve user queries to the state as opposed to processing transactions. A query is initiated from an [interface](#intefaces) by an end-user who provides a `queryRoute` and some `data`. The query is then routed to the correct application's `querier` by `baseapp`'s [`handleQueryCustom`](https://github.com/cosmos/cosmos-sdk/blob/master/baseapp/baseapp.go#L519-L556) method using `queryRoute`. - -The `Querier` of a module is defined in a file called `querier.go`, and consists of: - -- A **switch function** `NewQuerier` to route the query to the appropriate `querier` function. This function returns a `querier` function, and is is registered in the [`AppModule`](#application-module-interface) to be used in the application's module manager to initialize the application's query router. See an example of such a switch [here](https://github.com/cosmos/sdk-application-tutorial/blob/master/x/nameservice/querier.go#L21-L34). -- - **One querier function for each data type defined by the module that needs to be queryable**. Developers write the query processing logic in these functions. This generally involves calling [`keeper`](#keeper)'s methods to query the state and marshaling it to JSON. See an example of `querier` functions [here](https://github.com/cosmos/sdk-application-tutorial/blob/master/x/nameservice/querier.go#L37-L101). +Along with the type definition, the next important component of the `keeper.go` file is the `keeper`'s constructor function, `NewKeeper`. This function instantiates a new `keeper` of the type defined above, with a `codec`, store `keys` and potentially references to other modules' `keeper`s as parameters. The `NewKeeper` function is called from the [application's constructor](#constructor-function). The rest of the file defines the `keeper`'s methods, primarily getters and setters. ### Command-Line and REST Interfaces @@ -199,40 +191,45 @@ Each module defines command-line commands and REST routes to be exposed to end-u #### CLI -Generally, the commands related to a module are defined in a folder called `client/cli` in the module's folder. The CLI divides commands in two category, transactions and queries, defined in `client/cli/tx.go` and `client/cli/query.go` respectively. Both commands are built on top of the [Cobra Library](https://github.com/spf13/cobra): +Generally, the [commands related to a module](../building-modules/module-interfaces.md#cli) are defined in a folder called `client/cli` in the module's folder. The CLI divides commands in two category, transactions and queries, defined in `client/cli/tx.go` and `client/cli/query.go` respectively. Both commands are built on top of the [Cobra Library](https://github.com/spf13/cobra): -- Transactions commands let users generate new transactions so that they can be included in a block and eventually update the state. One command should be created for each [message type](#message-types) defined in the module. The command calls the constructor of the message with the parameters provided by the end-user, and wraps it into a transaction. The SDK handles signing and the addition of other transaction metadata. See examples of transactions commands [here](https://github.com/cosmos/sdk-application-tutorial/blob/master/x/nameservice/client/cli/tx.go). -- Queries let users query the subset of the state defined by the module. Query commands forward queries to the [application's query router](./baseapp.md#query-routing), which routes them to the appropriate [querier](#querier) the `queryRoute` parameter supplied. See examples of query commands [here](https://github.com/cosmos/sdk-application-tutorial/blob/master/x/nameservice/client/cli/query.go). +- Transactions commands let users generate new transactions so that they can be included in a block and eventually update the state. One command should be created for each [message type](#message-types) defined in the module. The command calls the constructor of the message with the parameters provided by the end-user, and wraps it into a transaction. The SDK handles signing and the addition of other transaction metadata. +- Queries let users query the subset of the state defined by the module. Query commands forward queries to the [application's query router](../core/baseapp.md#query-routing), which routes them to the appropriate [querier](#querier) the `queryRoute` parameter supplied. #### REST -The module's REST interface lets users generate transactions and query the state through REST calls to the application's light client daemon (LCD). REST routes are defined in a file `client/rest/rest.go`, which is composed of: +The [module's REST interface](../building-modules/module-interfaces.md#rest) lets users generate transactions and query the state through REST calls to the application's [light client daemon](../core/node.md#lcd) (LCD). REST routes are defined in a file `client/rest/rest.go`, which is composed of: - A `RegisterRoutes` function, which registers each route defined in the file. This function is called from the [main application's interface](#application-interfaces) for each module used within the application. The router used in the SDK is [Gorilla's mux](https://github.com/gorilla/mux). -- Custom request type definitions for each query or transaction creation function that needs to be exposed. These custom request types build on the [base `request` type](https://github.com/cosmos/cosmos-sdk/blob/master/types/rest/rest.go#L32-L43) of the Cosmos SDK. +- Custom request type definitions for each query or transaction creation function that needs to be exposed. These custom request types build on the base `request` type of the Cosmos SDK: + +++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/rest/rest.go#L47-L60 - One handler function for each request that can be routed to the given module. These functions implement the core logic necessary to serve the request. -See an example of a module's `rest.go` file [here](https://github.com/cosmos/sdk-application-tutorial/blob/master/x/nameservice/client/rest/rest.go). - ## Application Interface -Interfaces let end-users interact with full-node clients. This means querying data from the full-node or creating and sending new transactions to be relayed by the full-node and eventually included in a block. +[Interfaces](../interfaces/interfaces-intro.md) let end-users interact with full-node clients. This means querying data from the full-node or creating and sending new transactions to be relayed by the full-node and eventually included in a block. -The main interface is the Command-Line Interface. The CLI of an SDK application is built by aggregating [CLI commands](#cli) defined in each of the modules used by the application. The CLI of an application generally has the `-cli` suffix (e.g. `appcli`), and defined in a file called `cmd/appcli/main.go`. The file contains: +The main interface is the [Command-Line Interface](../interfaces/cli.md). The CLI of an SDK application is built by aggregating [CLI commands](#cli) defined in each of the modules used by the application. The CLI of an application generally has the `-cli` suffix (e.g. `appcli`), and defined in a file called `cmd/appcli/main.go`. The file contains: - **A `main()` function**, which is executed to build the `appcli` interface client. This function prepares each command and adds them to the `rootCmd` before building them. At the root of `appCli`, the function adds generic commands like `status`, `keys` and `config`, query commands, tx commands and `rest-server`. -- **Query commands** are added by calling the `queryCmd` function, also defined in `appcli/main.go`. This function returns a Cobra command that contains the query commands defined in each of the application's modules (passed as an array of `sdk.ModuleClients` from the `main()` function), as well as some other lower level query commands such as block or validator queries. Query command are called by using the command `appcli query [query]` of the CLI. -- **Transaction commands** are added by calling the `txCmd` function. Similar to `queryCmd`, the function returns a Cobra command that contains the tx commands defined in each of the application's modules, as well as lower level tx commands like transaction signing or broadcasting. Tx commands are called by using the command `appcli tx [tx]` of the CLI. -- **A `registerRoutes` function**, which is called from the `main()` function when initializing the [application's light-client daemon (LCD)](./node.md#lcd) (i.e. `rest-server`). `registerRoutes` calls the `RegisterRoutes` function of each of the application's module, thereby registering the routes of the module to the lcd's router. The LCD can be started by running the following command `appcli rest-server`. +- **Query commands** are added by calling the `queryCmd` function, also defined in `appcli/main.go`. This function returns a Cobra command that contains the query commands defined in each of the application's modules (passed as an array of `sdk.ModuleClients` from the `main()` function), as well as some other lower level query commands such as block or validator queries. Query command are called by using the command `appcli query [query]` of the CLI. +- **Transaction commands** are added by calling the `txCmd` function. Similar to `queryCmd`, the function returns a Cobra command that contains the tx commands defined in each of the application's modules, as well as lower level tx commands like transaction signing or broadcasting. Tx commands are called by using the command `appcli tx [tx]` of the CLI. +- **A `registerRoutes` function**, which is called from the `main()` function when initializing the [application's light-client daemon (LCD)](../core/node.md#lcd) (i.e. `rest-server`). `registerRoutes` calls the `RegisterRoutes` function of each of the application's module, thereby registering the routes of the module to the lcd's router. The LCD can be started by running the following command `appcli rest-server`. + +See an example of an application's main command-line file from the [nameservice tutorial](https://github.com/cosmos/sdk-tutorials/tree/master/nameservice) -See an example of an application's main command-line file [here](https://github.com/cosmos/sdk-application-tutorial/blob/master/cmd/nscli/main.go). ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/cmd/nscli/main.go ## Dependencies and Makefile -This section is optional, as developers are free to choose their dependency manager and project building method. That said, the current most used framework for versioning control is [`go.mod`](https://github.com/golang/go/wiki/Modules). It ensures each of the libraries used throughout the application are imported with the correct version. An example can be found [here](https://github.com/cosmos/sdk-application-tutorial/blob/master/go.mod). +This section is optional, as developers are free to choose their dependency manager and project building method. That said, the current most used framework for versioning control is [`go.mod`](https://github.com/golang/go/wiki/Modules). It ensures each of the libraries used throughout the application are imported with the correct version. See an example from the [nameservice tutorial](https://github.com/cosmos/sdk-tutorials/tree/master/nameservice): + ++++ https://github.com/cosmos/sdk-tutorials/blob/c6754a1e313eb1ed973c5c91dcc606f2fd288811/go.mod#L1-L18 + +For building the application, a [Makefile](https://en.wikipedia.org/wiki/Makefile) is generally used. The Makefile primarily ensures that the `go.mod` is run before building the two entrypoints to the application, [`appd`](#node-client) and [`appcli`](#application-interface). See an example of Makefile from the [nameservice tutorial]() -For building the application, a [Makefile](https://en.wikipedia.org/wiki/Makefile) is generally used. The Makefile primarily ensures that the `go.mod` is run before building the two entrypoints to the application, [`appd`](#node-client) and [`appcli`](#application-interface). An example of Makefile can be found [here](https://github.com/cosmos/sdk-application-tutorial/blob/master/Makefile). ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/Makefile -## Next +## Next {hide} -Learn more about the [Lifecycle of a transaction](./tx-lifecycle.md). +Learn more about the [Lifecycle of a transaction](./tx-lifecycle.md) {hide} diff --git a/docs/basics/gas-fees.md b/docs/basics/gas-fees.md new file mode 100644 index 000000000000..b54a7f19be60 --- /dev/null +++ b/docs/basics/gas-fees.md @@ -0,0 +1,88 @@ +--- +order: 4 +synopsis: This document describes the default strategies to handle gas and fees within a Cosmos SDK application. +--- + +# Gas and Fees + +## Pre-requisite Readings {hide} + +- [Anatomy of an SDK Application](./app-anatomy.md) {prereq} + +## Introduction to `Gas` and `Fees` + +In the Cosmos SDK, `gas` is a special unit that is used to track the consumption of resources during execution. `gas` is typically consumed whenever read and writes are made to the store, but it can also be consumed if expensive computation needs to be done. It serves two main purposes: + +- Make sure blocks are not consuming too many resources and will be finalized. This is implemented by default in the SDK via the [block gas meter](#block-gas-meter). +- Prevent spam and abuse from end-user. To this end, `gas` consumed during [`message`](../building-modules/messages-and-queries.md#messages) execution is typically priced, resulting in a `fee` (`fees = gas * gas-prices`). `fees` generally have to be paid by the sender of the `message`. Note that the SDK does not enforce `gas` pricing by default, as there may be other ways to prevent spam (e.g. bandwidth schemes). Still, most applications will implement `fee` mechanisms to prevent spam. This is done via the [`AnteHandler`](#antehandler). + +## Gas Meter + +In the Cosmos SDK, `gas` is a simple alias for `uint64`, and is managed by an object called a *gas meter*. Gas meters implement the `GasMeter` interface + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/types/gas.go#L31-L39 + +where: + +- `GasConsumed()` returns the amount of gas that was consumed by the gas meter instance. +- `GasConsumedToLimit()` returns the amount of gas that was consumed by gas meter instance, or the limit if it is reached. +- `Limit()` returns the limit of the gas meter instance. `0` if the gas meter is infinite. +- `ConsumeGas(amount Gas, descriptor string)` consumes the amount of `gas` provided. If the `gas` overflows, it panics with the `descriptor` message. If the gas meter is not infinite, it panics if `gas` consumed goes above the limit. +- `IsPastLimit()` returns `true` if the amount of gas consumed by the gas meter instance is strictly above the limit, `false` otherwise. +- `IsOutOfGas()` returns `true` if the amount of gas consumed by the gas meter instance is above or equal to the limit, `false` otherwise. + +The gas meter is generally held in [`ctx`](../core/context.md), and consuming gas is done with the following pattern: + +```go +ctx.GasMeter().ConsumeGas(amount, "description") +``` + +By default, the Cosmos SDK makes use of two different gas meters, the [main gas meter](#main-gas-metter[) and the [block gas meter](#block-gas-meter). + +### Main Gas Meter + +`ctx.GasMeter()` is the main gas meter of the application. The main gas meter is initialized in `BeginBlock` via `setDeliverState`, and then tracks gas consumption during execution sequences that lead to state-transitions, i.e. those originally triggered by [`BeginBlock`](../core/baseapp.md#beginblock), [`DeliverTx`](../core/baseapp.md#delivertx) and [`EndBlock`](../core/baseapp.md#endblock). At the beginning of each `DeliverTx`, the main gas meter **must be set to 0** in the [`AnteHandler`](#antehandler), so that it can track gas comsumption per-transaction. + +Gas comsumption can be done manually, generally by the module developer in the [`BeginBlocker`, `EndBlocker`](../building-modules/beginblock-endblock.md) or [`handler`](../building-modules/handler.md), but most of the time it is done automatically whenever there is a read or write to the store. This automatic gas consumption logic is implemented in a special store called [`GasKv`](../core/store.md#gaskv-store). + +### Block Gas Meter + +`ctx.BlockGasMeter()` is the gas meter used to track gas consumption per block and make sure it does not go above a certain limit. A new instance of the `BlockGasMeter` is created each time [`BeginBlock`](../core/baseapp.md#beginblock) is called. The `BlockGasMeter` is finite, and the limit of gas per block is defined in the application's consensus parameters. By default Cosmos SDK applications use the default consensus parameters provided by Tendermint: + ++++ https://github.com/tendermint/tendermint/blob/f323c80cb3b78e123ea6238c8e136a30ff749ccc/types/params.go#L65-L72 + +When a new [transaction](../core/transactions.md) is being processed via `DeliverTx`, the current value of `BlockGasMeter` is checked to see if it is above the limit. If it is, `DeliverTx` returns immediately. This can happen even with the first transaction in a block, as `BeginBlock` itself can consume gas. If not, the transaction is processed normally. At the end of `DeliverTx`, the gas tracked by `ctx.BlockGasMeter()` is increased by the amount consumed to process the transaction: + +```go +ctx.BlockGasMeter().ConsumeGas( + ctx.GasMeter().GasConsumedToLimit(), + "block gas meter", +) +``` + +## AnteHandler + +The `AnteHandler` is a special `handler` that is run for every transaction during `CheckTx` and `DeliverTx`, before the `handler` of each `message` in the transaction. `AnteHandler`s have a different signature than `handler`s: + +```go +// AnteHandler authenticates transactions, before their internal messages are handled. +// If newCtx.IsZero(), ctx is used instead. +type AnteHandler func(ctx Context, tx Tx, simulate bool) (newCtx Context, result Result, abort bool) +``` + +The `anteHandler` is not implemented in the core SDK but in a module. This gives the possibility to developers to choose which version of `AnteHandler` fits their application's needs. That said, most applications today use the default implementation defined in the [`auth` module](https://github.com/cosmos/cosmos-sdk/tree/master/x/auth). Here is what the `anteHandler` is intended to do in a normal Cosmos SDK application: + +- Verify that the transaction are of the correct type. Transaction types are defined in the module that implements the `anteHandler`, and they follow the transaction interface: + +++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/tx_msg.go#L33-L41 +This enables developers to play with various types for the transaction of their application. In the default `auth` module, the standard transaction type is `StdTx`: + +++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/x/auth/types/stdtx.go#L22-L29 +- Verify signatures for each [`message`](../building-modules/messages-and-queries.md#messages) contained in the transaction. Each `message` should be signed by one or multiple sender(s), and these signatures must be verified in the `anteHandler`. +- During `CheckTx`, verify that the gas prices provided with the transaction is greater than the local `min-gas-prices` (as a reminder, gas-prices can be deducted from the following equation: `fees = gas * gas-prices`). `min-gas-prices` is a parameter local to each full-node and used during `CheckTx` to discard transactions that do not provide a minimum amount of fees. This ensure that the mempool cannot be spammed with garbage transactions. +- Verify that the sender of the transaction has enough funds to cover for the `fees`. When the end-user generates a transaction, they must indicate 2 of the 3 following parameters (the third one being implicit): `fees`, `gas` and `gas-prices`. This signals how much they are willing to pay for nodes to execute their transaction. The provided `gas` value is stored in a parameter called `GasWanted` for later use. +- Set `newCtx.GasMeter` to 0, with a limit of `GasWanted`. **This step is extremely important**, as it not only makes sure the transaction cannot consume infinite gas, but also that `ctx.GasMeter` is reset in-between each `DeliverTx` (`ctx` is set to `newCtx` after `anteHandler` is run, and the `anteHandler` is run each time `DeliverTx` is called). + +As explained above, the `anteHandler` returns a maximum limit of `gas` the transaction can consume during execution called `GasWanted`. The actual amount consumed in the end is denominated `GasUsed`, and we must therefore have `GasUsed =< GasWanted`. Both `GasWanted` and `GasUsed` are relayed to the underlying consensus engine when [`DeliverTx`](../core/baseapp.md#delivertx) returns. + +## Next {hide} + +Learn about [baseapp](../core/baseapp.md) {hide} \ No newline at end of file diff --git a/docs/basics/tx-lifecycle.md b/docs/basics/tx-lifecycle.md index 01bf4848d5ff..af138706b543 100644 --- a/docs/basics/tx-lifecycle.md +++ b/docs/basics/tx-lifecycle.md @@ -1,18 +1,13 @@ -# Transaction Lifecycle - -## Prerequisite Reading +--- +order: 2 +synopsis: "This document describes the lifecycle of a transaction from creation to committed state changes. Transaction definition is described in a [different doc](../core/transactions.md). The transaction will be referred to as `Tx`." +--- -* [Anatomy of an SDK Application](./app-anatomy.md) - -## Synopsis +# Transaction Lifecycle -This document describes the lifecycle of a transaction from creation to committed state changes. Transaction definition is described in a [different doc](../core/tx-msgs.md#transactions). The transaction will be referred to as `Tx`. +## Pre-requisite Readings {hide} -1. [Creation](#creation) -2. [Addition to Mempool](#addition-to-mempool) -3. [Inclusion in a Block](#inclusion-in-a-block) -4. [State Changes](#state-changes) -5. [Consensus and Commit](#consensus-and-commit) +- [Anatomy of an SDK Application](./app-anatomy.md) {prereq} ## Creation @@ -26,13 +21,13 @@ One of the main application interfaces is the command-line interface. The transa This command will automatically **create** the transaction, **sign** it using the account's private key, and **broadcast** it to the specified peer node. -There are several required and optional flags for transaction creation. The `--from` flag specifies which [account](./accounts-fees-gas.md#accounts) the transaction is originating from. For example, if the transaction is sending coins, the funds will be drawn from the specified `from` address. +There are several required and optional flags for transaction creation. The `--from` flag specifies which [account](./accounts.md) the transaction is originating from. For example, if the transaction is sending coins, the funds will be drawn from the specified `from` address. #### Gas and Fees -Additionally, there are several [flags](../interfaces/cli.md) users can use to indicate how much they are willing to pay in [fees](./accounts-fees-gas.md#fees): +Additionally, there are several [flags](../interfaces/cli.md) users can use to indicate how much they are willing to pay in [fees](./gas-fees.md): -* `--gas` refers to how much [gas](./accounts-fees-gas.md#gas), which represents computational resources, `Tx` consumes. Gas is dependent on the transaction and is not precisely calculated until execution, but can be estimated by providing `auto` as the value for `--gas`. +* `--gas` refers to how much [gas](./gas-fees.md), which represents computational resources, `Tx` consumes. Gas is dependent on the transaction and is not precisely calculated until execution, but can be estimated by providing `auto` as the value for `--gas`. * `--gas-adjustment` (optional) can be used to scale `gas` up in order to avoid underestimating. For example, users can specify their gas adjustment as 1.5 to use 1.5 times the estimated gas. * `--gas-prices` specifies how much the user is willing pay per unit of gas, which can be one or multiple denominations of tokens. For example, `--gas-prices=0.025uatom, 0.025upho` means the user is willing to pay 0.025uatom AND 0.025upho per unit of gas. * `--fees` specifies how much in fees the user is willing to pay in total. @@ -56,12 +51,8 @@ The command-line is an easy way to interact with an application, but `Tx` can al ## Addition to Mempool Each full-node (running Tendermint) that receives a `Tx` sends an [ABCI message](https://tendermint.com/docs/spec/abci/abci.html#messages), -`CheckTx`, to the application layer to check for validity, and receives an -`abci.ResponseCheckTx`. If the `Tx` passes the checks, it is held in the nodes' -[**Mempool**](https://tendermint.com/docs/tendermint-core/mempool.html#mempool) -(an in-memory pool of transactions unique to each node) pending inclusion in a -block - honest nodes will discard `Tx` if it is found to be invalid. Prior to -consensus, nodes continuously check incoming transactions and gossip them to their peers. +`CheckTx`, to the application layer to check for validity, and receives an `abci.ResponseCheckTx`. If the `Tx` passes the checks, it is held in the nodes' +[**Mempool**](https://tendermint.com/docs/tendermint-core/mempool.html#mempool), an in-memory pool of transactions unique to each node) pending inclusion in a block - honest nodes will discard `Tx` if it is found to be invalid. Prior to consensus, nodes continuously check incoming transactions and gossip them to their peers. ### Types of Checks @@ -86,21 +77,21 @@ through several steps, beginning with decoding `Tx`. ### Decoding -When `Tx` is received by the application from the underlying consensus engine (e.g. Tendermint), it is still in its encoded (i.e. using [Amino](https://tendermint.com/docs/spec/blockchain/encoding.html#amino)) `[]byte` form and needs to be unmarshaled in order to be processed. Then, the [`runTx`](../core/baseapp.md#runtx-and-runmsgs) function is called to run in `runTxModeCheck` mode, meaning the function will run all checks but exit before executing messages and writing state changes. +When `Tx` is received by the application from the underlying consensus engine (e.g. Tendermint), it is still in its [encoded](../core/encoding.md) `[]byte` form and needs to be unmarshaled in order to be processed. Then, the [`runTx`](../core/baseapp.md#runtx-and-runmsgs) function is called to run in `runTxModeCheck` mode, meaning the function will run all checks but exit before executing messages and writing state changes. ### ValidateBasic -[Messages](../core/tx-msgs.md#messages) are extracted from `Tx` and `ValidateBasic`, a function defined by the module developer for every message, is run for each one. It should include basic stateless sanity checks. For example, if the message is to send coins from one address to another, `ValidateBasic` likely checks for nonempty addresses and a nonnegative coin amount, but does not require knowledge of state such as account balance of an address. +[`Message`s](../core/transactions.md#messages) are extracted from `Tx` and `ValidateBasic`, a method of the `Msg` interface implemented by the module developer, is run for each one. It should include basic **stateless** sanity checks. For example, if the message is to send coins from one address to another, `ValidateBasic` likely checks for nonempty addresses and a nonnegative coin amount, but does not require knowledge of state such as account balance of an address. ### AnteHandler -The [`AnteHandler`](../core/baseapp.md#antehandler), which is technically optional but should be defined for each application, is run. A deep copy of the internal state, `checkState`, is made and the defined `AnteHandler` performs limited checks specified for the transaction type. Using a copy allows the handler to do stateful checks for `Tx` without modifying the last committed state, and revert back to the original if the execution fails. +The [`AnteHandler`](../basics/gas-fees.md#antehandler), which is technically optional but should be defined for each application, is run. A deep copy of the internal state, `checkState`, is made and the defined `AnteHandler` performs limited checks specified for the transaction type. Using a copy allows the handler to do stateful checks for `Tx` without modifying the last committed state, and revert back to the original if the execution fails. -For example, the [`auth`](https://github.com/cosmos/cosmos-sdk/tree/master/docs/spec/auth) module `AnteHandler` checks and increments sequence numbers, checks signatures and account numbers, and deducts fees from the first signer of the transaction - all state changes are made using the `checkState`. +For example, the [`auth`](https://github.com/cosmos/cosmos-sdk/tree/master/x/auth/spec) module `AnteHandler` checks and increments sequence numbers, checks signatures and account numbers, and deducts fees from the first signer of the transaction - all state changes are made using the `checkState`. ### Gas -The [`Context`](../core/context.md) used to keep track of important data while `AnteHandler` is executing `Tx` keeps a `GasMeter` which tracks how much gas has been used. The user-provided amount for gas is known as the value `GasWanted`. If `GasConsumed`, the amount of gas consumed so far, ever exceeds `GasWanted`, execution stops. Otherwise, `CheckTx` sets `GasUsed` equal to `GasConsumed` and returns it in the result. After calculating the gas and fee values, validator-nodes check that the user-specified `gas-prices` is less than their locally defined `min-gas-prices`. +The [`Context`](../core/context.md), which keeps a `GasMeter` that will track how much gas has been used during the execution of `Tx`, is initialized. The user-provided amount of gas for `Tx` is known as `GasWanted`. If `GasConsumed`, the amount of gas consumed so during execution, ever exceeds `GasWanted`, the execution will stop and the changes made to the cacehd copy of the state won't be committed. Otherwise, `CheckTx` sets `GasUsed` equal to `GasConsumed` and returns it in the result. After calculating the gas and fee values, validator-nodes check that the user-specified `gas-prices` is less than their locally defined `min-gas-prices`. ### Discard or Addition to Mempool @@ -109,8 +100,7 @@ there. Otherwise, if it passes `CheckTx` successfully, the default protocol is t nodes and add it to the Mempool so that the `Tx` becomes a candidate to be included in the next block. The **mempool** serves the purpose of keeping track of transactions seen by all full-nodes. -Full-nodes that are not validators (and thus do not participate in creating blocks) keep a -**mempool cache** of the last `mempool.cache_size` transactions they have seen, as a first line of +Full-nodes keep a **mempool cache** of the last `mempool.cache_size` transactions they have seen, as a first line of defense to prevent replay attacks. Ideally, `mempool.cache_size` is large enough to encompass all of the transactions in the full mempool. If the the mempool cache is too small to keep track of all the transactions, `CheckTx` is responsible for identifying and rejecting replayed transactions. @@ -142,11 +132,11 @@ must be in this proposer's mempool. ## State Changes The next step of consensus is to execute the transactions to fully validate them. All full-nodes -that receive a block proposal execute the transactions by calling the ABCI functions +that receive a block proposal from the correct proposer execute the transactions by calling the ABCI functions [`BeginBlock`](./app-anatomy.md#beginblocker-and-endblocker), `DeliverTx` for each transaction, -and [`EndBlock`](./app-anatomy.md#beginblocker-and-endblocker). While full-nodes each run everything -individually, since the messages' state transitions are deterministic and transactions are -explicitly ordered in the block proposal, this process yields a single, unambiguous result. +and [`EndBlock`](./app-anatomy.md#beginblocker-and-endblocker). While each full-node runs everything +locally, this process yields a single, unambiguous result, since the messages' state transitions are deterministic and transactions are +explicitly ordered in the block proposal. ``` ----------------------- @@ -190,7 +180,7 @@ explicitly ordered in the block proposal, this process yields a single, unambigu The `DeliverTx` ABCI function defined in [`baseapp`](../core/baseapp.md) does the bulk of the state transitions: it is run for each transaction in the block in sequential order as committed to during consensus. Under the hood, `DeliverTx` is almost identical to `CheckTx` but calls the -[`runTx`](../core/baseapp.md#runtx-and-runmsgs) function in deliver mode instead of check mode. +[`runTx`](../core/baseapp.md#runtx) function in deliver mode instead of check mode. Instead of using their `checkState`, full-nodes use `deliverState`: * **Decoding:** Since `DeliverTx` is an ABCI call, `Tx` is received in the encoded `[]byte` form. @@ -206,16 +196,16 @@ to each node - differing values across nodes would yield nondeterministic result * **Route and Handler:** While `CheckTx` would have exited, `DeliverTx` continues to run [`runMsgs`](../core/baseapp.md#runtx-and-runmsgs) to fully execute each `Msg` within the transaction. Since the transaction may have messages from different modules, `baseapp` needs to know which module -to find the appropriate Handler. Thus, the [`Route`](../core/tx-msgs.md#route) function is called to -retrieve the route name and find the `Handler` within the module. +to find the appropriate Handler. Thus, the `route` function is called via the [module manager](../building-modules/module-manager.md) to +retrieve the route name and find the [`Handler`](../building-modules/handler.md) within the module. -* **Handler:** The `Handler`, a step up from `AnteHandler`, is responsible for executing each +* **Handler:** The `handler`, a step up from `AnteHandler`, is responsible for executing each message in the `Tx` and causes state transitions to persist in `deliverTxState`. It is defined within a `Msg`'s module and writes to the appropriate stores within the module. -* **Gas:** While a `Tx` is being delivered, a block `GasMeter` is used to keep track of how much -gas is left for each transaction; if execution completes, `GasUsed` is set and returned in the -`abci.ResponseDeliverTx`. If execution halts because `GasMeter` has run out or something else goes +* **Gas:** While a `Tx` is being delivered, a `GasMeter` is used to keep track of how much +gas is being used; if execution completes, `GasUsed` is set and returned in the +`abci.ResponseDeliverTx`. If execution halts because `BlockGasMeter` or `GasMeter` has run out or something else goes wrong, a deferred function at the end appropriately errors or panics. If there are any failed state changes resulting from a `Tx` being invalid or `GasMeter` running out, @@ -224,25 +214,15 @@ block proposal cause validator nodes to reject the block and vote for a `nil` bl `Tx` is delivered successfully, any leftover gas is returned to the user and the transaction is validated. -### Consensus and Commit +### Commit -The final step is for validator nodes to commit the block and state changes. Validator nodes +The final step is for nodes to commit the block and state changes. Validator nodes perform the previous step of executing state transitions in order to validate the transactions, -then sign the block to confirm and vote for them. Full nodes that are not validators do not +then sign the block to confirm it. Full nodes that are not validators do not participate in consensus - i.e. they cannot vote - but listen for votes to understand whether or -not they should commit the state changes. - -#### Consensus - -The consensus layer may technically run any consensus algorithm to come to agreement on which block -to accept. In [Tendermint BFT](https://tendermint.com/docs/spec/consensus/consensus.html), validator -nodes go through a Prevote stage and a Precommit stage, and the block requires +2/3 Precommits from -the validator-nodes to move into the commit stage. Note that this phase is purely in the consensus -layer; a `Tx` is represented as a `[]byte`. - -#### Commit +not they should commit the state changes. -In the **Commit** stage, full nodes commit to a new block to be added to the blockchain and +When they receive enough validator votes (2/3+ *precommits* weighted by voting power), full nodes commit to a new block to be added to the blockchain and finalize the state transitions in the application layer. A new state root is generated to serve as a merkle proof for the state transitions. Applications use the [`Commit`](../core/baseapp.md#commit) ABCI method inherited from [Baseapp](../core/baseapp.md); it syncs all the state transitions by @@ -260,6 +240,6 @@ At this point, the transaction lifecycle of a `Tx` is over: nodes have verified delivered it by executing its state changes, and committed those changes. The `Tx` itself, in `[]byte` form, is stored in a block and appended to the blockchain. -## Next +## Next {hide} -Learn about [Baseapp](../core/baseapp.md). +Learn about [accounts](./accounts.md) {hide} diff --git a/docs/building-modules/README.md b/docs/building-modules/README.md index 145e6e501dfa..732485c74477 100644 --- a/docs/building-modules/README.md +++ b/docs/building-modules/README.md @@ -1,75 +1,22 @@ -# Modules +--- +order: false +parent: + order: 4 +--- + +# Building Modules + +This repository contains documentation on concepts developers need to know in order to build modules for Cosmos SDK applications. + +1. [Introduction to Cosmos SDK Modules](./intro.md) +2. [`AppModule` Interface and Module Manager](./module-manager.md) +3. [Messages and Queries](./messages-and-queries.md) +4. [`Handler`s - Processing Messages](./handler.md) +5. [`Querier`s - Processing Queries](./querier.md) +6. [BeginBlocker and EndBlocker](./beginblock-endblock.md) +7. [`Keeper`s](./keeper.md) +8. [Invariants](./invariants.md) +9. [Genesis](./genesis.md) +10. [Module Interfaces](./module-interfaces.md) +11. [Standard Module Structure](./structure.md) -## Auth - -The `x/auth` modules is used for accounts - -- [API docs](https://godoc.org/github.com/cosmos/cosmos-sdk/x/auth) -- [Specification](https://github.com/cosmos/cosmos-sdk/tree/master/docs/spec/auth) - -## Bank - -The `x/bank` module is for transferring coins between accounts. - -- [API docs](https://godoc.org/github.com/cosmos/cosmos-sdk/x/bank) -- [Specification](https://github.com/cosmos/cosmos-sdk/tree/master/docs/spec/bank) - -## Staking - -The `x/staking` module is for Cosmos Delegated-Proof-of-Stake. - -- [API docs](https://godoc.org/github.com/cosmos/cosmos-sdk/x/staking) -- [Specification](https://github.com/cosmos/cosmos-sdk/tree/master/docs/spec/staking) - -## Slashing - -The `x/slashing` module is for Cosmos Delegated-Proof-of-Stake. - -- [API docs](https://godoc.org/github.com/cosmos/cosmos-sdk/x/slashing) -- [Specification](https://github.com/cosmos/cosmos-sdk/tree/master/docs/spec/slashing) - -## Distribution - -The `x/distribution` module is for distributing fees and inflation across bonded -stakeholders. - -- [API docs](https://godoc.org/github.com/cosmos/cosmos-sdk/x/distribution) -- [Specification](https://github.com/cosmos/cosmos-sdk/tree/master/docs/spec/distribution) - -## Governance - -The `x/gov` module is for bonded stakeholders to make proposals and vote on them. - -- [API docs](https://godoc.org/github.com/cosmos/cosmos-sdk/x/gov) -- [Specification](https://github.com/cosmos/cosmos-sdk/tree/master/docs/spec/governance) - -To keep up with the current status of IBC, follow and contribute to [ICS](https://github.com/cosmos/ics) - -## Crisis - -The `x/crisis` module is for halting the blockchain under certain circumstances. - -- [API Docs](https://godoc.org/github.com/cosmos/cosmos-sdk/x/crisis) -- [Specification](https://github.com/cosmos/cosmos-sdk/blob/master/docs/spec/crisis) - -## Mint - -The `x/mint` module is for flexible inflation rates and effect a balance between market liquidity and staked supply. - -- [API Docs](https://godoc.org/github.com/cosmos/cosmos-sdk/x/mint) -- [Specification](https://github.com/cosmos/cosmos-sdk/blob/master/docs/spec/mint) - -## Params - -The `x/params` module provides a globally available parameter store. - -- [API Docs](https://godoc.org/github.com/cosmos/cosmos-sdk/x/params) -- [Specification](https://github.com/cosmos/cosmos-sdk/blob/master/docs/spec/params) - -## Evidence - -The `x/evidence` modules provides a mechanism for defining and submitting arbitrary -events of misbehavior and a means to execute custom business logic for such misbehavior. - -- [API Docs](https://godoc.org/github.com/cosmos/cosmos-sdk/x/evidence) -- [Specification](https://github.com/cosmos/cosmos-sdk/blob/master/docs/spec/evidence) diff --git a/docs/building-modules/beginblock-endblock.md b/docs/building-modules/beginblock-endblock.md new file mode 100644 index 000000000000..fe3aeedceb92 --- /dev/null +++ b/docs/building-modules/beginblock-endblock.md @@ -0,0 +1,38 @@ +--- +order: 6 +synopsis: "`BeginBlocker` and `EndBlocker` are optional methods module developers can implement in their module. They will be triggered at the beginning and at the end of each block respectively, when the [`BeginBlock`](../core/baseapp.md#beginblock) and [`EndBlock`](../core/baseapp.md#endblock) ABCI messages are received from the underlying consensus engine." +--- + +# BeginBlocker and EndBlocker + +## Pre-requisite Readings {hide} + +- [Module Manager](./module-manager.md) {prereq} + +## BeginBlocker and EndBlocker + +`BeginBlocker` and `EndBlocker` are a way for module developers to add automatic execution of logic to their module. This is a powerful tool that should be used carefully, as complex automatic functions can slow down or even halt the chain. + +When needed, `BeginBlocker` and `EndBlocker` are implemented as part of the [`AppModule` interface](./module-manager.md#appmodule). The `BeginBlock` and `EndBlock` methods of the interface implemented in `module.go` generally defer to `BeginBlocker` and `EndBlocker` methods respectively, which are usually implemented in a **`abci.go`** file. + +The actual implementation of `BeginBlocker` and `EndBlocker` in `./abci.go` are very similar to that of a [`handler`](./handler.md): + +- They generally use the [`keeper`](./keeper.md) and [`ctx`](../core/context.md) to retrieve information about the latest state. +- If needed, they use the `keeper` and `ctx` to trigger state-transitions. +- If needed, they can emit [`events`](../core/events.md) via the `ctx`'s `EventManager`. + +A specificity of the `EndBlocker` is that it can return validator updates to the underlying consensus engine in the form of an [`[]abci.ValidatorUpdates`](https://tendermint.com/docs/app-dev/abci-spec.html#validatorupdate). This is the preferred way to implement custom validator changes. + +It is possible for developers to defined the order of execution between the `BeginBlocker`/`EndBlocker` functions of each of their application's modules via the module's manager `SetOrderBeginBlocker`/`SetOrderEndBlocker` methods. For more on the module manager, click [here](./module-manager.md#manager). + +See an example implementation of `BeginBlocker` from the `distr` module: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/x/distribution/abci.go#L10-L32 + +and an example implementation of `EndBlocker` from the `staking` module: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/x/staking/handler.go#L44-L96 + +## Next {hide} + +Learn about [`keeper`s](./keeper.md) {hide} diff --git a/docs/building-modules/genesis.md b/docs/building-modules/genesis.md new file mode 100644 index 000000000000..0d4ddec93e77 --- /dev/null +++ b/docs/building-modules/genesis.md @@ -0,0 +1,59 @@ +--- +order: 9 +synopsis: Modules generally handle a subset of the state and, as such, they need to define the related subset of the genesis file as well as methods to initialize, verify and export it. +--- + +# Module Genesis + +## Pre-requisite Readings {hide} + +- [Module Manager](./module-manager.md) {prereq} +- [Keepers](./keeper.md) {prereq} + +## Type Definition + +The subset of the genesis state defined from a given module is generally defined in a `./internal/types/genesis.go` file, along with the `DefaultGenesis` and `ValidateGenesis` methods. The struct defining the module's subset of the genesis state is usually called `GenesisState` and contains all the module-related values that need to be initialized during the genesis process. + +See an example of `GenesisState` type definition from the nameservice tutorial + ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/x/nameservice/genesis.go#L10-L12 + +Next we present the main genesis-related methods that need to be implemented by module developers in order for their module to be used in Cosmos SDK applications. + +### `DefaultGenesis` + +The `DefaultGenesis()` method is a simple method that calls the constructor function for `GenesisState` with the default value for each parameter. See an example from the `nameservice` module: + ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/x/nameservice/genesis.go#L33-L37 + +### `ValidateGenesis` + +The `ValidateGenesis(genesisState GenesisState)` method is called to verify that the provided `genesisState` is correct. It should perform validity checks on each of the parameter listed in `GenesisState`. See an example from the `nameservice` module: + ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/x/nameservice/genesis.go#L18-L31 + +## Other Genesis Methods + +Other than the methods related directly to `GenesisState`, module developers are expected to implement two other methods as part of the [`AppModuleGenesis` interface](./module-manager.md#appmodulegenesis) (only if the module needs to initialize a subset of state in genesis). These methods are [`InitGenesis`](#initgenesis) and [`ExportGenesis`](#exportgenesis). + +### `InitGenesis` + +The `InitGenesis` method is executed during [`InitChain`](../core/baseapp.md#initchain) when the application is first started. Given a `GenesisState`, it initializes the subset of the state managed by the module by using the module's [`keeper`](./keeper.md) setter function on each parameter within the `GenesisState`. + +The [module manager](./module-manager.md#manager) of the application is responsible for calling the `InitGenesis` method of each of the application's modules, in order. This order is set by the application developer via the manager's `SetOrderGenesisMethod`, which is called in the [application's constructor function](../basics/app-anatomy.md#constructor-function) + +See an example of `InitGenesis` from the nameservice tutorial + ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/x/nameservice/genesis.go#L39-L44 + +### `ExportGenesis` + +The `ExportGenesis` method is executed whenever an export of the state is made. It takes the latest known version of the subset of the state managed by the module and creates a new `GenesisState` out of it. This is mainly used when the chain needs to be upgraded via a hard fork. + +See an example of `ExportGenesis` from the nameservice tutorial. + ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/x/nameservice/genesis.go#L46-L57 + +## Next {hide} + +Learn about [modules interfaces](#module-interfaces.md) {hide} \ No newline at end of file diff --git a/docs/building-modules/handler.md b/docs/building-modules/handler.md new file mode 100644 index 000000000000..b42d591c0867 --- /dev/null +++ b/docs/building-modules/handler.md @@ -0,0 +1,76 @@ +--- +order: 4 +synopsis: "A `Handler` designates a function that processes [`message`s](./messages-and-queries.md#messages). `Handler`s are specific to the module in which they are defined, and only process `message`s defined within the said module. They are called from `baseapp` during [`DeliverTx`](../core/baseapp.md#delivertx)." +--- + +# Handlers + +## Pre-requisite Readings {hide} + +- [Module Manager](./module-manager.md) {prereq} +- [Messages and Queries](./messages-and-queries.md) {prereq} + +## `handler` type + +The `handler` type defined in the Cosmos SDK specifies the typical structure of a `handler` function. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/handler.go#L4 + +Let us break it down: + +- The [`Msg`](./messages-and-queries.md#messages) is the actual object being processed. +- The [`Context`](../core/context.md) contains all the necessary information needed to process the `msg`, as well as a cache-wrapped copy of the latest state. If the `msg` is succesfully processed, the modified version of the temporary state contained in the `ctx` will be written to the main state. +- The [`Result`] returned to `baseapp`, which contains (among other things) information on the execution of the `handler`, [`gas`](../basics/gas-fees.md) consumption and [`events`](../core/events.md). + +++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/result.go#L15-L40 + +## Implementation of a module `handler`s + +Module `handler`s are typically implemented in a `./handler.go` file inside the module's folder. The [module manager](./module-manager.md) is used to add the module's `handler`s to the [application's `router`](../core/baseapp.md#message-routing) via the `NewHandler()` method. Typically, the manager's `NewHandler()` method simply calls a `NewHandler()` method defined in `handler.go`, which looks like the following: + +```go +func NewHandler(keeper Keeper) sdk.Handler { + return func(ctx sdk.Context, msg sdk.Msg) sdk.Result { + switch msg := msg.(type) { + case MsgType1: + return handleMsgType1(ctx, keeper, msg) + case MsgType2: + return handleMsgType2(ctx, keeper, msg) + default: + errMsg := fmt.Sprintf("Unrecognized nameservice Msg type: %v", msg.Type()) + return sdk.ErrUnknownRequest(errMsg).Result() + } + } +} +``` + +This simple switch returns a `handler` function specific to the type of the received `message`. These `handler` functions are the ones that actually process `message`s, and usually follow the following 2 steps: + +- First, they perform *stateful* checks to make sure the `message` is valid. At this stage, the `message`'s `ValidateBasic()` method has already been called, meaning *stateless* checks on the message (like making sure parameters are correctly formatted) have already been performed. Checks performed in the `handler` can be more expensive and require access to the state. For example, a `handler` for a `transfer` message might check that the sending account has enough funds to actually perform the transfer. To access the state, the `handler` needs to call the [`keeper`'s](./keeper.md) getter functions. +- Then, if the checks are successfull, the `handler` calls the [`keeper`'s](./keeper.md) setter functions to actually perform the state transition. + +Before returning, `handler` functions generally emit one or multiple [`events`](../core/events.md) via the `EventManager` held in the `ctx`: + +```go +ctx.EventManager().EmitEvent( + sdk.NewEvent( + eventType, // e.g. sdk.EventTypeMessage for a message, types.CustomEventType for a custom event defined in the module + sdk.NewAttribute(attributeKey, attributeValue), + ), + ) +``` + +These `events` are relayed back to the underlying consensus engine and can be used by service providers to implement services around the application. Click [here](../core/events.md) to learn more about `events`. + +Finally, the `handler` function returns a `sdk.Result` which contains the aforementioned `events` and an optional `Data` field. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/result.go#L15-L40 + +Next is an example of how to return a `Result` from the `gov` module: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/x/gov/handler.go#L59-L62 + +For a deeper look at `handler`s, see this [example implementation of a `handler` function](https://github.com/cosmos/sdk-application-tutorial/blob/c6754a1e313eb1ed973c5c91dcc606f2fd288811/x/nameservice/handler.go) from the nameservice tutorial. + +## Next {hide} + +Learn about [queriers](./querier.md) {hide} diff --git a/docs/building-modules/intro.md b/docs/building-modules/intro.md new file mode 100644 index 000000000000..8ad43da48ece --- /dev/null +++ b/docs/building-modules/intro.md @@ -0,0 +1,93 @@ +--- +order: 1 +synopsis: Modules define most of the logic of SDK applications. Developers compose module together using the Cosmos SDK to build their custom application-specific blockchains. This document outlines the basic concepts behind SDK modules and how to approach module management. +--- + +# Introduction to SDK Modules + +## Pre-requisite Readings {hide} + +- [Anatomy of an SDK application](../basics/app-anatomy.md) {prereq} +- [Lifecycle of an SDK transaction](../basics/tx-lifecycle.md) {prereq} + +## Role of Modules in an SDK Application + +The Cosmos SDK can be thought as the Ruby-on-Rails of blockchain development. It comes with a core that provides the basic functionalities every blockchain application needs, like a [boilerplate implementation of the ABCI](../core/baseapp.md) to communicate with the underlying consensus engine, a [`multistore`](../core/store.md#multistore) to persist state, a [server](../core/node.md) to form a full-node and [interfaces](../interfaces/interfaces-intro.md) to handle queries. + +On top of this core, the Cosmos SDK enables developers to build modules that implement the business logic of their application. In other words, SDK modules implement the bulk of the logic of applications, while the core does the wiring and enables modules to be composed together. The end goal is to build a robust ecosystem of open-source SDK modules, making it increasingly easier to build complex blockchain applications. + +SDK Modules can be seen as little state-machines within the state-machine. They generally define a subset of the state using one ore multiple `KVStore` in the [main multistore](../core/store.md), as well as a subset of [`message` types](./messages-and-queries.md#messages). These `message`s are routed by one of the main component of SDK core, [`baseapp`](../core/baseapp.md), to the [`handler`](./handler.md) of the module that define them. + +``` + + + | + | Transaction relayed from the full-node's consensus engine + | to the node's application via DeliverTx + | + | + | + +---------------------v--------------------------+ + | APPLICATION | + | | + | Using baseapp's methods: Decode the Tx, | + | extract and route the message(s) | + | | + +---------------------+--------------------------+ + | + | + | + +---------------------------+ + | + | + | + | Message routed to the correct + | module to be processed + | + | ++----------------+ +---------------+ +----------------+ +------v----------+ +| | | | | | | | +| AUTH MODULE | | BANK MODULE | | STAKING MODULE | | GOV MODULE | +| | | | | | | | +| | | | | | | Handles message,| +| | | | | | | Updates state | +| | | | | | | | ++----------------+ +---------------+ +----------------+ +------+----------+ + | + | + | + | + +--------------------------+ + | + | Return result to the underlying consensus engine (e.g. Tendermint) + | (0=Ok, 1=Err) + v +``` + +As a result of this architecture, building an SDK application usually revolves around writing modules to implement the specialized logic of the application, and composing them with existing modules to complete the application. Developers will generally work on modules that implement logic needed for their specific use case that do not exist yet, and will use existing modules for more generic functionalities like staking, accounts or token management. + +## How to Approach Building Modules as a Developer + +While there is no definitive guidelines for writing modules, here are some important design principles developers should keep in mind when building them: + +- **Composability**: SDK applications are almost always composed of multiple modules. This means developers need to carefully consider the integration of their module not only with the core of the Cosmos SDK, but also with other modules. The former is achieved by following standard design patterns outlined [here](#main-components-of-sdk-modules), while the latter is achieved by properly exposing the store(s) of the module via the [`keeper`](./keeper.md). +- **Specialization**: A direct consequence of the **composability** feature is that modules should be **specialized**. Developers should carefully establish the scope of their module and not batch multiple functionalities into the same module. This separation of concern enables modules to be re-used in other projects and improves the upgradability of the application. **Specialization** also plays an important role in the [object-capabilities model](../core/ocap.md) of the Cosmos SDK. +- **Capabilities**: Most modules need to read and/or write to the store(s) of other modules. However, in an open-source environment, it is possible for some module to be malicious. That is why module developers need to carefully think not only about how their module interracts with other modules, but also about how to give access to the module's store(s). The Cosmos SDK takes a capabilities-oriented approach to inter-module security. This means that each store defined by a module is accessed by a `key`, which is held by the module's [`keeper`](./keeper.md). This `keeper` defines how to access the store(s) and under what conditions. Access to the module's store(s) is done by passing a reference to the module's `keeper`. + +## Main Components of SDK Modules + +Modules are by convention defined in the `.x/` subfolder (e.g. the `bank` module will be defined in the `./x/bank` folder). They generally share the same core components: + +- Custom [`message` types](./messages-and-queries.md#messages) to trigger state-transitions. +- A [`handler`](./handler.md) used to process messages when they are routed to the module by [`baseapp`](../core/baseapp.md#message-routing). +- A [`keeper`](./keeper.md), used to access the module's store(s) and update the state. +- A [`querier`](./querier.md), used to process user queries when they are routed to the module by [`baseapp`](../core/baseapp.md#query-routing). +- Interfaces, for end users to query the subset of the state defined by the module and create `message`s of the custom types defined in the module. + +In addition to these components, modules implement the `AppModule` interface in order to be managed by the [`module manager`](./module-manager.md). + +Please refer to the [structure document](./structure.md) to learn about the recommended structure of a module's directory. + +## Next {hide} + +Read more on the [`AppModule` interface and the `module manager`](./module-manager.md) {hide} + diff --git a/docs/building-modules/invariants.md b/docs/building-modules/invariants.md new file mode 100644 index 000000000000..2e18551914d4 --- /dev/null +++ b/docs/building-modules/invariants.md @@ -0,0 +1,88 @@ +--- +order: 8 +synopsis: "An invariant is a property of the application that should always be true. In the context of the Cosmos SDK, an `Invariant` is a function that checks for a particular invariant. These functions are useful to detect bugs early on and act upon them to limit their potential consequences (e.g. by halting the chain). They are also useful in the development process of the application to detect bugs via simulations." +--- + +# Invariants + +## Pre-requisite Readings {hide} + +- [Keepers](./keeper.md) {prereq} + +## Implementing `Invariant`s + +An `Invariant` is a function that checks for a particular invariant within a module. Module `Invariant`s must follow the `Invariant`s type: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/invariant.go#L9 + +where the `string` return value is the invariant message, which can be used when printing logs, and the `bool` return value is the actual result of the invariant check. + +In practice, each module implements `Invariant`s in a `./internal/keeper/invariants.go` file within the module's folder. The standard is to implement one `Invariant` function per logical grouping of invariants with the following model: + +```go +// Example for an Invariant that checks balance-related invariants + +func BalanceInvariants(k Keeper) sdk.Invariant { + return func(ctx sdk.Context) (string, bool) { + // Implement checks for balance-related invariants + } +} +``` + +Additionally, module developers should generally implement an `AllInvariants` function that runs all the `Invariant`s functions of the module: + +```go +// AllInvariants runs all invariants of the module. +// In this example, the module implements two Invariants: BalanceInvariants and DepositsInvariants + +func AllInvariants(k Keeper) sdk.Invariant { + + return func(ctx sdk.Context) (string, bool) { + res, stop := BalanceInvariants(k)(ctx) + if stop { + return res, stop + } + + return DepositsInvariant(k)(ctx) + } +} +``` + +Finally, module developers need to implement the `RegisterInvariants` method as part of the [`AppModule` interface](./module-manager.md#appmodule). Indeed, the `RegisterInvariants` method of the module, implemented in the `module.go` file, typically only defers the call to a `RegisterInvariants` method implemented in `internal/keeper/invariants.go`. The `RegisterInvariants` method registers a route for each `Invariant` function in the [`InvariantRegistry`](#invariant-registry): + + +```go +// RegisterInvariants registers all staking invariants +func RegisterInvariants(ir sdk.InvariantRegistry, k Keeper) { + ir.RegisterRoute(types.ModuleName, "module-accounts", + BalanceInvariants(k)) + ir.RegisterRoute(types.ModuleName, "nonnegative-power", + DepositsInvariant(k)) +} +``` + +For more, see an example of [`Invariant`s implementation from the `staking` module](https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/x/staking/keeper/invariants.go). + +## Invariant Registry + +The `InvariantRegistry` is a registry where the `Invariant`s of all the modules of an application are registered. There is only one `InvariantRegistry` per **application**, meaning module developers need not implement their own `InvariantRegistry` when building a module. **All module developers need to do is to register their modules' invariants in the `InvariantRegistry`, as explained in the section above**. The rest of this section gives more information on the `InvariantRegistry` itself, and does not contain anything directly relevant to module developers. + +At its core, the `InvariantRegistry` is defined in the SDK as an interface: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/invariant.go#L14-L17 + +Typically, this interface is implemented in the `keeper` of a specific module. The most used implementation of an `InvariantRegistry` can be found in the `crisis` module: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/x/crisis/internal/keeper/keeper.go#L45-L49 + + The `InvariantRegistry` is therefore typically instantiated by instantiating the `keeper` of the `crisis` module in the [application's constructor function](../basics/app-anatomy.md#constructor-function). + +`Invariant`s can be checked manually via [`message`s](./messages-and-queries.md), but most often they are checked automatically at the end of each block. Here is an example from the `crisis` module: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/x/crisis/abci.go#L7-L14 + +In both cases, if one of the `Invariant`s returns false, the `InvariantRegistry` can trigger special logic (e.g. have the application panic and print the `Invariant`s message in the log). + +## Next {hide} + +Learn about [genesis functionalities](./genesis.md) {hide} diff --git a/docs/building-modules/keeper.md b/docs/building-modules/keeper.md new file mode 100644 index 000000000000..e76b0bb008d0 --- /dev/null +++ b/docs/building-modules/keeper.md @@ -0,0 +1,78 @@ +--- +order: 7 +synopsis: "`Keeper`s refer to a Cosmos SDK abstraction whose role is to manage access to the subset of the state defined by various modules. `Keeper`s are module-specific, i.e. the subset of state defined by a module can only be accessed by a `keeper` defined in said module. If a module needs to access the subset of state defined by another module, a reference to the second module's internal `keeper` needs to be passed to the first one. This is done in `app.go` during the instantiation of module keepers." +--- + +# Keepers + +## Pre-requisite Readings {hide} + +- [Introduction to SDK Modules](./intro.md) {prereq} + +## Motivation + +The Cosmos SDK is a framework that makes it easy for developers to build complex decentralised applications from scratch, mainly by composing modules together. As the ecosystem of open source modules for the Cosmos SDK expands, it will become increasingly likely that some of these modules contain vulnerabilities, as a result of the negligence or malice of their developer. + +The Cosmos SDK adopts an [object-capabilities-based approach](../core/ocap.md) to help developers better protect their application from unwanted inter-module interactions, and `keeper`s are at the core of this approach. A `keeper` can be thought of quite literally as the gatekeeper of a module's store(s). Each store (typically an [`IAVL` Store](../core/store.md#iavl-store)) defined within a module comes with a `storeKey`, which grants unlimited access to it. The module's `keeper` holds this `storeKey` (which should otherwise remain unexposed), and defines [methods](#implementing-methods) for reading and writing to the store(s). + +The core idea behind the object-capabilities approach is to only reveal what is necessary to get the work done. In practice, this means that instead of handling permissions of modules through access-control lists, module `keeper`s are passed a reference to the specific instance of the other modules' `keeper`s that they need to access (this is done in the [application's constructor function](../basics/app-anatomy.md#constructor-function)). As a consequence, a module can only interact with the subset of state defined in another module via the methods exposed by the instance of the other module's `keeper`. This is a great way for developers to control the interactions that their own module can have with modules developed by external developers. + +## Type Definition + +`keeper`s are generally implemented in a `internal/keeper/keeper.go` file located in the module's folder. By convention, the type `keeper` of a module is simply named `Keeper` and usually follows the following structure: + +```go +type Keeper struct { + // External keepers, if any + + // Store key(s) + + // codec +} +``` + +For example, here is the [type definition of the `keeper` from the nameservice tutorial: + ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/x/nameservice/internal/keeper/keeper.go#L10-L17 + +Let us go through the different parameters: + +- An expected `keeper` is a `keeper` external to a module that is required by the internal `keeper` of said module. External `keeper`s are listed in the internal `keeper`'s type definition as interfaces. These interfaces are themselves defined in a `internal/types/expected_keepers.go` file within the module's folder. In this context, interfaces are used to reduce the number of dependencies, as well as to facilitate the maintenance of the module itself. +- `storeKey`s grant access to the store(s) of the [multistore](../core/store.md) managed by the module. They should always remain unexposed to external modules. +- A [codec `cdc`](../core/encoding.md), used to marshall and unmarshall struct to/from `[]byte`. + +Of course, it is possible to define different types of internal `keeper`s for the same module (e.g. a read-only `keeper`). Each type of `keeper` comes with its own constructor function, which is called from the [application's constructor function](../basics/app-anatomy.md). This is where `keeper`s are instantiated, and where developers make sure to pass correct instances of modules' `keeper`s to other modules that require it. + +## Implementing Methods + +`Keeper`s primarily expose getter and setter methods for the store(s) managed by their module. These methods should remain as simple as possible and strictly be limited to getting or setting the requested value, as validity checks should have already been performed via the `ValidateBasic()` method of the [`message`](./messages-and-queries.md#messages) and the [`handler`](./handler.md) when `keeper`s' methods are called. + +Typically, a *getter* method will present with the following signature + +```go +func (k Keeper) Get(ctx sdk.Context, key string) returnType +``` + +and go through the following steps: + +1. Retrieve the appropriate store from the `ctx` using the `storeKey`. This is done through the `KVStore(storeKey sdk.StoreKey` method of the `ctx`. +2. If it exists, get the `[]byte` value stored at location `[]byte(key)` using the `Get(key []byte)` method of the store. +3. Unmarshall the retrieved value from `[]byte` to `returnType` using the codec `cdc`. Return the value. + +Similarly, a *setter* method will present with the following signature + +```go +func (k Keeper) Set(ctx sdk.Context, key string, value valueType) +``` + +and go through the following steps: + +1. Retrieve the appropriate store from the `ctx` using the `storeKey`. This is done through the `KVStore(storeKey sdk.StoreKey` method of the `ctx`. +2. Marhsall `value` to `[]byte` using the codec `cdc`. +3. Set the encoded value in the store at location `key` using the `Set(key []byte, value []byte)` method of the store. + +For more, see an example of `keeper`'s [methods implementation from the nameservice tutorial](https://github.com/cosmos/sdk-application-tutorial/blob/c6754a1e313eb1ed973c5c91dcc606f2fd288811/x/nameservice/internal/keeper/keeper.go). + +## Next {hide} + +Learn about [invariants](./invariants.md) {hide} diff --git a/docs/building-modules/messages-and-queries.md b/docs/building-modules/messages-and-queries.md new file mode 100644 index 000000000000..bb0665483b36 --- /dev/null +++ b/docs/building-modules/messages-and-queries.md @@ -0,0 +1,75 @@ +--- +order: 3 +synopsis: "`Message`s and `Queries` are the two primary objects handled by modules. Most of the core components defined in a module, like `handler`s, `keeper`s and `querier`s, exist to process `message`s and `queries`." +--- + +# Messages and Queries + +## Pre-requisite Readings {hide} + +- [Introduction to SDK Modules](./intro.md) {prereq} + +## Messages + +`Message`s are objects whose end-goal is to trigger state-transitions. They are wrapped in [transactions](../core/transactions.md), which may contain one or multiple of them. + +When a transaction is relayed from the underlying consensus engine to the SDK application, it is first decoded by [`baseapp`](../core/baseapp.md). Then, each `message` contained in the transaction is extracted and routed to the appropriate module via `baseapp`'s `router` so that it can be processed by the module's [`handler`](./handler.md). For a more detailed explanation of the lifecycle of a transaction, click [here](../basics/tx-lifecycle.md). + +Defining `message`s is the responsibility of module developers. Typically, they are defined in a `./internal/types/msgs.go` file inside the module's folder. The `message`'s type definition usually includes a list of parameters needed to process the message that will be provided by end-users when they want to create a new transaction containing said `message`. + +```go +// Example of a message type definition + +type MsgSubmitProposal struct { + Content Content `json:"content" yaml:"content"` + InitialDeposit sdk.Coins `json:"initial_deposit" yaml:"initial_deposit"` + Proposer sdk.AccAddress `json:"proposer" yaml:"proposer"` +} +``` + +The `Msg` is typically accompanied by a standard constructor function, that is called from one of the [module's interface](./module-interfaces.md). `message`s also need to implement the [`Msg`] interface: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/tx_msg.go#L7-L29 + +It contains the following methods: + +- `Route() string`: Name of the route for this message. Typically all `message`s in a module have the same route, which is most often the module's name. +- `Type() string`: Type of the message, used primarly in [events](../core/events.md). This should return a message-specific `string`, typically the denomination of the message itself. +- `ValidateBasic() Error`: This method is called by `baseapp` very early in the processing of the `message` (in both [`CheckTx`](../core/baseapp.md#checktx) and [`DeliverTx`](../core/baseapp.md#delivertx)), in order to discard obviously invalid messages. `ValidateBasic` should only include *stateless* checks, i.e. checks that do not require access to the state. This usually consists in checking that the message's parameters are correctly formatted and valid (i.e. that the `amount` is strictly positive for a transfer). +- `GetSignBytes() []byte`: Return the canonical byte representation of the message. Used to generate a signature. +- `GetSigners() []AccAddress`: Return the list of signers. The SDK will make sure that each `message` contained in a transaction is signed by all the signers listed in the list returned by this method. + +See an example implementation of a `message` from the `nameservice` module: + ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/x/nameservice/internal/types/msgs.go#L10-L51 + +## Queries + +A `query` is a request for information made by end-users of applications through an interface and processed by a full-node. A `query` is received by a full-node through its consensus engine and relayed to the application via the ABCI. It is then routed to the appropriate module via `baseapp`'s `queryrouter` so that it can be processed by the module's [`querier`](./querier.md). For a deeper look at the lifecycle of a `query`, click [here](../interfaces/query-lifecycle.md). + +Contrary to `message`s, there is usually no specific `query` object defined by module developers. Instead, the SDK takes the simpler approach of using a simple `path` to define each `query`. The `path` contains the `query` type and all the arguments needed in order to process it. For most module queries, the `path` should look like the following: + +``` +queryCategory/queryRoute/queryType/arg1/arg2/... +``` + +where: + +- `queryCategory` is the category of the `query`, typically `custom` for module queries. It is used to differentiate between different kinds of queries within `baseapp`'s [`Query` method](../core/baseapp.md#query). +- `queryRoute` is used by `baseapp`'s [`queryRouter`](../core/baseapp.md#query-routing) to map the `query` to its module. Usually, `queryRoute` should be the name of the module. +- `queryType` is used by the module's [`querier`](./querier.md) to map the `query` to the appropriate `querier function` within the module. +- `args` are the actual arguments needed to process the `query`. They are filled out by the end-user. Note that for bigger queries, you might prefer passing arguments in the `Data` field of the request `req` instead of the `path`. + +The `path` for each `query` must be defined by the module developer in the module's [command-line interface file](./module-interfaces.md#query-commands).Overall, there are 3 mains components module developers need to implement in order to make the subset of the state defined by their module queryable: + +- A [`querier`](./querier.md), to process the `query` once it has been [routed to the module](../core/baseapp.md#query-routing). +- [Query commands](./module-interfaces.md#query-commands) in the module's CLI file, where the `path` for each `query` is specified. +- `query` return types. Typically defined in a file `internal/types/querier.go`, they specify the result type of each of the module's `queries`. These custom types must implement the `String()` method of [`fmt.Stringer`](https://golang.org/pkg/fmt/#Stringer). + +See an example of `query` return types from the `nameservice` module: + ++++ https://github.com/cosmos/sdk-tutorials/blob/c6754a1e313eb1ed973c5c91dcc606f2fd288811/x/nameservice/internal/types/querier.go#L5-L21 + +## Next {hide} + +Learn about [`handler`s](./handler.md) {hide} \ No newline at end of file diff --git a/docs/building-modules/module-interfaces.md b/docs/building-modules/module-interfaces.md new file mode 100644 index 000000000000..5b1352621a42 --- /dev/null +++ b/docs/building-modules/module-interfaces.md @@ -0,0 +1,167 @@ +--- +order: 11 +synopsis: This document details how to build CLI and REST interfaces for a module. Examples from various SDK modules are included. +--- + +# Module Interfaces + +## Pre-requisite Readings {hide} + +* [Building Modules Intro](./intro.md) {prereq} + +## CLI + +One of the main interfaces for an application is the [command-line interface](../interfaces/cli.md). This entrypoint adds commands from the application's modules to let end-users create [**messages**](./messages-and-queries.md#messages) and [**queries**](./messages-and-queries.md#queries). The CLI files are typically found in the `./x/moduleName/client/cli` folder. + +### Transaction Commands + +[Transactions](../core/transactions.md) are created by users to wrap messages that trigger state changes when they get included in a valid block. Transaction commands typically have their own `tx.go` file in the module `./x/moduleName/client/cli` folder. The commands are specified in getter functions prefixed with `GetCmd` and include the name of the command. + +Here is an example from the `nameservice` module: + ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/x/nameservice/client/cli/tx.go#L33-L58 + +This getter function creates the command for the Buy Name transaction. It does the following: + +- **Construct the command:** Read the [Cobra Documentation](https://github.com/spf13/cobra) for details on how to create commands. + + **Use:** Specifies the format of a command-line entry users should type in order to invoke this command. In this case, the user uses `buy-name` as the name of the transaction command and provides the `name` the user wishes to buy and the `amount` the user is willing to pay. + + **Args:** The number of arguments the user provides, in this case exactly two: `name` and `amount`. + + **Short and Long:** A description for the function is provided here. A `Short` description is expected, and `Long` can be used to provide a more detailed description when a user uses the `--help` flag to ask for more information. + + **RunE:** Defines a function that can return an error, called when the command is executed. Using `Run` would do the same thing, but would not allow for errors to be returned. +- **`RunE` Function Body:** The function should be specified as a `RunE` to allow for errors to be returned. This function encapsulates all of the logic to create a new transaction that is ready to be relayed to nodes. + + The function should first initialize a [`TxBuilder`](../core/transactions.md#txbuilder) with the application `codec`'s `TxEncoder`, as well as a new [`CLIContext`](../interfaces/query-lifecycle.md#clicontext) with the `codec` and `AccountDecoder`. These contexts contain all the information provided by the user and will be used to transfer this user-specific information between processes. To learn more about how contexts are used in a transaction, click [here](../core/transactions.md#transaction-generation). + + If applicable, the command's arguments are parsed. Here, the `amount` given by the user is parsed into a denomination of `coins`. + + If applicable, the `CLIContext` is used to retrieve any parameters such as the transaction originator's address to be used in the transaction. Here, the `from` address is retrieved by calling `cliCtx.getFromAddress()`. + + A [message](./messages-and-queries.md) is created using all parameters parsed from the command arguments and `CLIContext`. The constructor function of the specific message type is called directly. It is good practice to call `ValidateBasic()` on the newly created message to run a sanity check and check for invalid arguments. + + Depending on what the user wants, the transaction is either generated offline or signed and broadcasted to the preconfigured node using `GenerateOrBroadcastMsgs()`. +- **Flags.** Add any [flags](#flags) to the command. No flags were specified here, but all transaction commands have flags to provide additional information from the user (e.g. amount of fees they are willing to pay). These *persistent* [transaction flags](../interfaces/cli.md#flags) can be added to a higher-level command so that they apply to all transaction commands. + +Finally, the module needs to have a `GetTxCmd()`, which aggregates all of the transaction commands of the module. Often, each command getter function has its own file in the module's `cli` folder, and a separate `tx.go` file contains `GetTxCmd()`. Application developers wishing to include the module's transactions will call this function to add them as subcommands in their CLI. Here is the `auth` `GetTxCmd()` function, which adds the `Sign` and `MultiSign` commands. + ++++ https://github.com/cosmos/cosmos-sdk/blob/67f6b021180c7ef0bcf25b6597a629aca27766b8/x/auth/client/cli/tx.go#L11-L25 + +An application using this module likely adds `auth` module commands to its root `TxCmd` command by calling `txCmd.AddCommand(authModuleClient.GetTxCmd())`. + +### Query Commands + +[Queries](./messages-and-queries.md#queries) allow users to gather information about the application or network state; they are routed by the application and processed by the module in which they are defined. Query commands typically have their own `query.go` file in the module `x/moduleName/client/cli` folder. Like transaction commands, they are specified in getter functions and have the prefix `GetCmdQuery`. Here is an example of a query command from the `nameservice` module: + ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/x/nameservice/client/cli/query.go#L52-L73 + +This query returns the address that owns a particular name. The getter function does the following: + +- **`codec` and `queryRoute`.** In addition to taking in the application `codec`, query command getters also take a `queryRoute` used to construct a path [Baseapp](../core/baseapp.md#query-routing) uses to route the query in the application. +- **Construct the command.** Read the [Cobra Documentation](https://github.com/spf13/cobra) and the [transaction command](#transaction-commands) example above for more information. The user must type `whois` and provide the `name` they are querying for as the only argument. +- **`RunE`.** The function should be specified as a `RunE` to allow for errors to be returned. This function encapsulates all of the logic to create a new query that is ready to be relayed to nodes. + + The function should first initialize a new [`CLIContext`](../interfaces/query-lifecycle.md#clicontext) with the application `codec`. + + If applicable, the `CLIContext` is used to retrieve any parameters (e.g. the query originator's address to be used in the query) and marshal them with the query parameter type, in preparation to be relayed to a node. There are no `CLIContext` parameters in this case because the query does not involve any information about the user. + + The `queryRoute` is used to construct a `path` [`baseapp`](../core/baseapp.md) will use to route the query to the appropriate [querier](./querier.md). The expected format for a query `path` is "queryCategory/queryRoute/queryType/arg1/arg2/...", where `queryCategory` can be `p2p`, `store`, `app`, or `custom`, `queryRoute` is the name of the module, and `queryType` is the name of the query type defined within the module. [`baseapp`](../core/baseapp.md) can handle each type of `queryCategory` by routing it to a module querier or retrieving results directly from stores and functions for querying peer nodes. Module queries are `custom` type queries (some SDK modules have exceptions, such as `auth` and `gov` module queries). + + The `CLIContext` `QueryWithData()` function is used to relay the query to a node and retrieve the response. It requires the `path`. It returns the result and height of the query upon success or an error if the query fails. In addition, it will verify the returned proof if `TrustNode` is disabled. If proof verification fails or the query height is invalid, an error will be returned. + + The `codec` is used to nmarshal the response and the `CLIContext` is used to print the output back to the user. +- **Flags.** Add any [flags](#flags) to the command. + + +Finally, the module also needs a `GetQueryCmd`, which aggregates all of the query commands of the module. Application developers wishing to include the module's queries will call this function to add them as subcommands in their CLI. Its structure is identical to the `GetTxCmd` command shown above. + +### Flags + +[Flags](../interfaces/cli.md#flags) are entered by the user and allow for command customizations. Examples include the [fees](../basics/gas-fees.md) or gas prices users are willing to pay for their transactions. + +The flags for a module are typically found in a `flags.go` file in the `./x/moduleName/client/cli` folder. Module developers can create a list of possible flags including the value type, default value, and a description displayed if the user uses a `help` command. In each transaction getter function, they can add flags to the commands and, optionally, mark flags as *required* so that an error is thrown if the user does not provide values for them. + +For full details on flags, visit the [Cobra Documentation](https://github.com/spf13/cobra). + +For example, the SDK `./client/flags` package includes a `PostCommands()` function that adds necessary flags to transaction commands, such as the `from` flag to indicate which address the transaction originates from. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/client/flags/flags.go#L85-L116 + +Here is an example of how to add a flag using the `from` flag from this function. + +```go +cmd.Flags().String(FlagFrom, "", "Name or address of private key with which to sign") +``` + +The input provided for this flag - called `FlagFrom` is a string with the default value of `""` if none is provided. If the user asks for a description of this flag, the description will be printed. + +A flag can be marked as *required* so that an error is automatically thrown if the user does not provide a value: + +```go +cmd.MarkFlagRequired(FlagFrom) +``` + +Since `PostCommands()` includes all of the basic flags required for a transaction command, module developers may choose not to add any of their own (specifying arguments instead may often be more appropriate). For a full list of what flags are included in the `PostCommands()` function, including which are required inputs from users, see the CLI documentation [here](../interfaces/cli.md#transaction-flags). + +## REST + +Applications typically support web services that use HTTP requests (e.g. a web wallet like [Lunie.io](https://lunie.io). Thus, application developers will also use REST Routes to route HTTP requests to the application's modules; these routes will be used by service providers. The module developer's responsibility is to define the REST client by defining [routes](#register-routes) for all possible [requests](#request-types) and [handlers](#request-handlers) for each of them. It's up to the module developer how to organize the REST interface files; there is typically a `rest.go` file found in the module's `./x/moduleName/client/rest` folder. + +To support HTTP requests, the module developer needs to define possible request types, how to handle them, and provide a way to register them with a provided router. + +### Request Types + +Request types, which define structured interactions from users, must be defined for all *transaction* requests. Users using this method to interact with an application will send HTTP Requests with the required fields in order to trigger state changes in the application. Conventionally, each request is named with the suffix `Req`, e.g. `SendReq` for a Send transaction. Each struct should include a base request [`baseReq`](../interfaces/rest.md#basereq), the name of the transaction, and all the arguments the user must provide for the transaction. + +Here is an example of a request to buy a name from the `nameservice` module: + ++++ https://github.com/cosmos/sdk-tutorials/blob/master/nameservice/x/nameservice/client/rest/tx.go#L14-L19 + +The `BaseReq` includes basic information that every request needs to have, similar to required flags in a CLI. All of these values, including `GasPrices` and `AccountNumber`, will be provided in the request body. The user will also need to specify the arguments `Name` and `Amount` fields in the body and `Buyer` will be provided by the user's address. + +#### BaseReq + +`BaseReq` is a type defined in the SDK that encapsulates much of the transaction configurations similar to CLI command flags. Users must provide the information in the body of their requests. + +* `From` indicates which [account](../basics/accounts.md) the transaction originates from. This account is used to sign the transaction. +* `Memo` sends a memo along with the transaction. +* `ChainID` specifies the unique identifier of the blockchain the transaction pertains to. +* `AccountNumber` is an identifier for the account. +* `Sequence`is the value of a counter measuring how many transactions have been sent from the account. It is used to prevent replay attacks. +* `Gas` refers to how much [gas](../basics/gas-fees.md), which represents computational resources, Tx consumes. Gas is dependent on the transaction and is not precisely calculated until execution, but can be estimated by providing auto as the value for `Gas`. +* `GasAdjustment` can be used to scale gas up in order to avoid underestimating. For example, users can specify their gas adjustment as 1.5 to use 1.5 times the estimated gas. +* `GasPrices` specifies how much the user is willing pay per unit of gas, which can be one or multiple denominations of tokens. For example, --gas-prices=0.025uatom, 0.025upho means the user is willing to pay 0.025uatom AND 0.025upho per unit of gas. +* `Fees` specifies how much in [fees](../basics/gas-fees.md) the user is willing to pay in total. Note that the user only needs to provide either `gas-prices` or `fees`, but not both, because they can be derived from each other. +* `Simulate` instructs the application to ignore gas and simulate the transaction running without broadcasting. + +### Request Handlers + +Request handlers must be defined for both transaction and query requests. Handlers' arguments include a reference to the application's `codec` and the [`CLIContext`](../interfaces/query-lifecycle.md#clicontext) created in the user interaction. + +Here is an example of a request handler for the nameservice module `buyNameReq` request (the same one shown above): + ++++ https://github.com/cosmos/sdk-tutorials/blob/master/nameservice/x/nameservice/client/rest/tx.go#L21-L57 + +The request handler can be broken down as follows: + +* **Parse Request:** The request handler first attempts to parse the request, and then run `Sanitize` and `ValidateBasic` on the underlying `BaseReq` to check the validity of the request. Next, it attempts to parse the arguments `Buyer` and `Amount` to the types `AccountAddress` and `Coins` respectively. +* **Message:** Then, a [message](./messages-and-queries.md) of the type `MsgBuyName` (defined by the module developer to trigger the state changes for this transaction) is created from the values and another sanity check, `ValidateBasic` is run on it. +* **Generate Transaction:** Finally, the HTTP `ResponseWriter`, application [`codec`](../core/encoding.md), [`CLIContext`](../interfaces/query-lifecycle.md#clicontext), request [`BaseReq`](../interfaces/rest.md#basereq), and message is passed to `WriteGenerateStdTxResponse` to further process the request. + +To read more about how a transaction is generated, visit the transactions documentation [here](../core/transactions.md#transaction-generation). + + +### Register Routes + +The application CLI entrypoint will have a `RegisterRoutes` function in its `main.go` file, which calls the `registerRoutes` functions of each module utilized by the application. Module developers need to implement `registerRoutes` for their modules so that applications are able to route messages and queries to their corresponding handlers and queriers. + +The router used by the SDK is [Gorilla Mux](https://github.com/gorilla/mux). The router is initialized with the Gorilla Mux `NewRouter()` function. Then, the router's `HandleFunc` function can then be used to route urls with the defined request handlers and the HTTP method (e.g. "POST", "GET") as a route matcher. It is recommended to prefix every route with the name of the module to avoid collisions with other modules that have the same query or transaction names. + +Here is a `registerRoutes` function with one query route example from the [nameservice tutorial](https://cosmos.network/docs/tutorial/rest.html): + +``` go +func RegisterRoutes(cliCtx context.CLIContext, r *mux.Router, cdc *codec.Codec, storeName string) { + // ResolveName Query + r.HandleFunc(fmt.Sprintf("/%s/names/{%s}", storeName, restName), resolveNameHandler(cdc, cliCtx, storeName)).Methods("GET") +} +``` + +A few things to note: + +* The router `r` has already been initialized by the application and is passed in here as an argument - this function is able to add on the nameservice module's routes onto any application's router. The application must also provide a [`CLIContext`](../interfaces/query-lifecycle.md#clicontext) that the querier will need to process user requests and the application [`codec`](../core/encoding.md) for encoding and decoding application-specific types. +* `"/%s/names/{%s}", storeName, restName` is the url for the HTTP request. `storeName` is the name of the module, `restName` is a variable provided by the user to specify what kind of query they are making. +* `resolveNameHandler` is the query request handler defined by the module developer. It also takes the application `codec` and `CLIContext` passed in from the user side, as well as the `storeName`. +* `"GET"` is the HTTP Request method. As to be expected, queries are typically GET requests. Transactions are typically POST and PUT requests. + + +## Next {hide} + +Read about the recommended [module structure](./structure.md) {hide} diff --git a/docs/building-modules/module-manager.md b/docs/building-modules/module-manager.md new file mode 100644 index 000000000000..2ad4bc9006a4 --- /dev/null +++ b/docs/building-modules/module-manager.md @@ -0,0 +1,142 @@ +--- +order: 2 +synopsis: "Cosmos SDK modules need to implement the [`AppModule` interfaces](#application-module-interfaces), in order to be managed by the application's [module manager](#module-manager). The module manager plays an important role in [`message` and `query` routing](../core/baseapp.md#routing), and allows application developers to set the order of execution of a variety of functions like [`BeginBlocker` and `EndBlocker`](../basics/app-anatomy.md#begingblocker-and-endblocker)." +--- + + +# Module Manager + +## Pre-requisite Readings {hide} + +- [Introduction to SDK Modules](./intro.md) {prereq} + +## Application Module Interfaces + +Application module interfaces exist to facilitate the composition of modules together to form a functional SDK application. There are 3 main application module interfaces: + +- [`AppModuleBasic`](#appmodulebasic) for independent module functionalities. +- [`AppModule`](#appmodule) for inter-dependent module functionalities (except genesis-related functionalities). +- [`AppModuleGenesis`](#appmodulegenesis) for inter-dependent genesis-related module functionalities. + +The `AppModuleBasic` interface exists to define independent methods of the module, i.e. those that do not depend on other modules in the application. This allows for the construction of the basic application structure early in the application definition, generally in the `init()` function of the [main application file](../basics/app-anatomy.md#core-application-file). + +The `AppModule` interface exists to define inter-dependent module methods. Many modules need to interract with other modules, typically through [`keeper`s](./keeper.md), which means there is a need for an interface where modules list their `keeper`s and other methods that require a reference to another module's object. `AppModule` interface also enables the module manager to set the order of execution between module's methods like `BeginBlock` and `EndBlock`, which is important in cases where the order of execution between modules matters in the context of the application. + +Lastly the interface for genesis functionality `AppModuleGenesis` is separated out from full module functionality `AppModule` so that modules which +are only used for genesis can take advantage of the `Module` patterns without having to define many placeholder functions. + +### `AppModuleBasic` + +The `AppModuleBasic` interface defines the independent methods modules need to implement. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/module/module.go#L46-L59 + +Let us go through the methods: + +- `Name()`: Returns the name of the module as a `string`. +- `RegisterCodec(*codec.Codec)`: Registers the `codec` for the module, which is used to marhsal and unmarshal structs to/from `[]byte` in order to persist them in the moduel's `KVStore`. +- `DefaultGenesis()`: Returns a default [`GenesisState`](./genesis.md#genesisstate) for the module, marshalled to `json.RawMessage`. The default `GenesisState` need to be defined by the module developer and is primarily used for testing. +- `ValidateGenesis(json.RawMessage)`: Used to validate the `GenesisState` defined by a module, given in its `json.RawMessage` form. It will usually unmarshall the `json` before running a custom [`ValidateGenesis`](./genesis.md#validategenesis) function defined by the module developer. +- `RegisterRESTRoutes(context.CLIContext, *mux.Router)`: Registers the REST routes for the module. These routes will be used to map REST request to the module in order to process them. See [../interfaces/rest.md] for more. +- `GetTxCmd(*codec.Codec)`: Returns the root [`Tx` command](./module-interfaces.md#tx) for the module. The subcommands of this root command are used by end-users to generate new transactions containing [`message`s](./messages-and-queries.md#queries) defined in the module. +- `GetQueryCmd(*codec.Codec)`: Return the root [`query` command](./module-interfaces.md#query) for the module. The subcommands of this root command are used by end-users to generate new queries to the subset of the state defined by the module. + +All the `AppModuleBasic` of an application are managed by the [`BasicManager`](#basicmanager). + +### `AppModuleGenesis` + +The `AppModuleGenesis` interface is a simple embedding of the `AppModuleBasic` interface with two added methods. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/module/module.go#L126-L131 + +Let us go through the two added methods: + +- `InitGenesis(sdk.Context, json.RawMessage)`: Initializes the subset of the state managed by the module. It is called at genesis (i.e. when the chain is first started). +- `ExportGenesis(sdk.Context)`: Exports the latest subset of the state managed by the module to be used in a new genesis file. `ExportGenesis` is called for each module when a new chain is started from the state of an existing chain. + +It does not have its own manager, and exists separately from [`AppModule`](#appmodule) only for modules that exist only to implement genesis functionalities, so that they can be managed without having to implement all of `AppModule`'s methods. If the module is not only used during genesis, `InitGenesis(sdk.Context, json.RawMessage)` and `ExportGenesis(sdk.Context)` will generally be defined as methods of the concrete type implementing hte `AppModule` interface. + +### `AppModule` + +The `AppModule` interface defines the inter-dependent methods modules need to implement. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/module/module.go#L133-L149 + +`AppModule`s are managed by the [module manager](#manager). This interface embeds the `AppModuleGenesis` interface so that the manager can access all the independent and genesis inter-dependent methods of the module. This means that a concrete type implementing the `AppModule` interface must either implement all the methods of `AppModuleGenesis` (and by extension `AppModuleBasic`), or include a concrete type that does as parameter. + +Let us go through the methods of `AppModule`: + +- `RegisterInvariants(sdk.InvariantRegistry)`: Registers the [`invariants`](./invariants.md) of the module. If the invariants deviates from its predicted value, the [`InvariantRegistry`](./invariants.md#registry) triggers appropriate logic (most often the chain will be halted). +- `Route()`: Returns the name of the module's route, for [`message`s](./messages-and-queries.md#messages) to be routed to the module by [`baseapp`](../core/baseapp.md#message-routing). +- `NewHandler()`: Returns a [`handler`](./handler.md) given the `Type()` of the `message`, in order to process the `message`. +- `QuerierRoute()`: Returns the name of the module's query route, for [`queries`](./messages-and-queries.md#queries) to be routes to the module by [`baseapp`](../core/baseapp.md#query-routing). +- `NewQuerierHandler()`: Returns a [`querier`](./querier.md) given the query `path`, in order to process the `query`. +- `BeginBlock(sdk.Context, abci.RequestBeginBlock)`: This method gives module developers the option to implement logic that is automatically triggered at the beginning of each block. Implement empty if no logic needs to be triggered at the beginning of each block for this module. +- `EndBlock(sdk.Context, abci.RequestEndBlock)`: This method gives module developers the option to implement logic that is automatically triggered at the beginning of each block. This is also where the module can inform the underlying consensus engine of validator set changes (e.g. the `staking` module). Implement empty if no logic needs to be triggered at the beginning of each block for this module. + +### Implementing the Application Module Interfaces + +Typically, the various application module interfaces are implemented in a file called `module.go`, located in the module's folder (e.g. `./x/module/module.go`). + +Almost every module need to implement the `AppModuleBasic` and `AppModule` interfaces. If the module is only used for genesis, it will implement `AppModuleGenesis` instead of `AppModule`. The concrete type that implements the interface can add parameters that are required for the implementation of the various methods of the interface. For example, the `NewHandler()` function often calls a `NewHandler(k keeper)` function defined in [`handler.go`](./handler.md) and therefore needs to pass the module's [`keeper`](./keeper.md) as parameter. + +```go +// example +type AppModule struct { + AppModuleBasic + keeper Keeper +} +``` + +In the example above, you can see that the `AppModule` concrete type references an `AppModuleBasic`, and not an `AppModuleGenesis`. That is because `AppModuleGenesis` only needs to be implemented in modules that focus on genesis-related functionalities. In most modules, the concrete `AppModule` type will have a reference to an `AppModuleBasic` and implement the two added methods of `AppModuleGenesis` directly in the `AppModule` type. + +If no parameter is required (which is often the case for `AppModuleBasic`), just declare an empty concrete type like so: + +```go +type AppModuleBasic struct{} +``` + +## Module Managers + +Module managers are used to manage collections of `AppModuleBasic` and `AppModule`. + +### `BasicManager` + +The `BasicManager` is a structure that lists all the `AppModuleBasic` of an application: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/module/module.go#L61-L63 + +It implements the following methods: + +- `NewBasicManager(modules ...AppModuleBasic)`: Constructor function. It takes a list of the application's `AppModuleBasic` and builds a new `BasicManager`. This function is generally called in the `init()` function of [`app.go`](../basics/app-anatomy.md#core-application-file) to quickly initialize the independent elements of the application's modules (click [here](https://github.com/cosmos/gaia/blob/master/app/app.go#L59-L74) to see an example). +- `RegisterCodec(cdc *codec.Codec)`: Registers the [`codec`s](../core/encoding.md) of each of the application's `AppModuleBasic`. This function is usually called early on in the [application's construction](../basics/app-anatomy.md#constructor). +- `DefaultGenesis()`: Provides default genesis information for modules in the application by calling the [`DefaultGenesis()`](./genesis.md#defaultgenesis) function of each module. It is used to construct a default genesis file for the application. +- `ValidateGenesis(genesis map[string]json.RawMessage)`: Validates the genesis information modules by calling the [`ValidateGenesis()`](./genesis.md#validategenesis) function of each module. +- `RegisterRESTRoutes(ctx context.CLIContext, rtr *mux.Router)`: Registers REST routes for modules by calling the [`RegisterRESTRoutes`](./module-interfaces.md#register-routes) function of each module. This function is usually called function from the `main.go` function of the [application's command-line interface](../interfaces/cli.md). +- `AddTxCommands(rootTxCmd *cobra.Command, cdc *codec.Codec)`: Adds modules' transaction commands to the application's [`rootTxCommand`](../interfaces/cli.md#transaction-commands). This function is usually called function from the `main.go` function of the [application's command-line interface](../interfaces/cli.md). +- `AddQueryCommands(rootQueryCmd *cobra.Command, cdc *codec.Codec)`: Adds modules' query commands to the application's [`rootQueryCommand`](../interfaces/cli.md#query-commands). This function is usually called function from the `main.go` function of the [application's command-line interface](../interfaces/cli.md). + + +### `Manager` + +The `Manager` is a structure that holds all the `AppModule` of an application, and defines the order of execution between several key components of these modules: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/module/module.go#L190-L198 + +The module manager is used throughout the application whenever an action on a collection of modules is required. It implements the following methods: + +- `NewManager(modules ...AppModule)`: Constructor function. It takes a list of the application's `AppModule`s and builds a new `Manager`. It is generally called from the application's main [constructor function](../basics/app-anatomy.md#constructor-function). +- `SetOrderInitGenesis(moduleNames ...string)`: Sets the order in which the [`InitGenesis`](./genesis.md#initgenesis) function of each module will be called when the application is first started. This function is generally called from the application's main [constructor function](../basics/app-anatomy.md#constructor-function). +- `SetOrderExportGenesis(moduleNames ...string)`: Sets the order in which the [`ExportGenesis`](./genesis.md#exportgenesis) function of each module will be called in case of an export. This function is generally called from the application's main [constructor function](../basics/app-anatomy.md#constructor-function). +- `SetOrderBeginBlockers(moduleNames ...string)`: Sets the order in which the `BeginBlock()` function of each module will be called at the beginning of each block. This function is generally called from the application's main [constructor function](../basics/app-anatomy.md#constructor-function). +- `SetOrderEndBlockers(moduleNames ...string)`: Sets the order in which the `EndBlock()` function of each module will be called at the beginning of each block. This function is generally called from the application's main [constructor function](../basics/app-anatomy.md#constructor-function). +- `RegisterInvariants(ir sdk.InvariantRegistry)`: Registers the [invariants](./invariants.md) of each module. +- `RegisterRoutes(router sdk.Router, queryRouter sdk.QueryRouter)`: Registers module routes to the application's `router`, in order to route [`message`s](./messages-and-queries.md#messages) to the appropriate [`handler`](./handler.md), and module query routes to the application's `queryRouter`, in order to route [`queries`](./messages-and-queries.md#queries) to the appropriate [`querier`](./querier.md). +- `InitGenesis(ctx sdk.Context, genesisData map[string]json.RawMessage)`: Calls the [`InitGenesis`](./genesis.md#initgenesis) function of each module when the application is first started, in the order defined in `OrderInitGenesis`. Returns an `abci.ResponseInitChain` to the underlying consensus engine, which can contain validator updates. +- `ExportGenesis(ctx sdk.Context)`: Calls the [`ExportGenesis`](./genesis.md#exportgenesis) function of each module, in the order defined in `OrderExportGenesis`. The export constructs a genesis file from a previously existing state, and is mainly used when a hard-fork upgrade of the chain is required. +- `BeginBlock(ctx sdk.Context, req abci.RequestBeginBlock)`: At the beginning of each block, this function is called from [`baseapp`](../core/baseapp.md#beginblock) and, in turn, calls the [`BeginBlock`](./beginblock-endblock.md) function of each module, in the order defined in `OrderBeginBlockers`. It creates a child [context](../core/context.md) with an event manager to aggregate [events](../core/events.md) emitted from all modules. The function returns an `abci.ResponseBeginBlock` which contains the aforementioned events. +- `EndBlock(ctx sdk.Context, req abci.RequestEndBlock)`: At the end of each block, this function is called from [`baseapp`](../core/baseapp.md#endblock) and, in turn, calls the [`EndBlock`](./beginblock-endblock.md) function of each module, in the order defined in `OrderEndBlockers`. It creates a child [context](../core/context.md) with an event manager to aggregate [events](../core/events.md) emitted from all modules. The function returns an `abci.ResponseEndBlock` which contains the aforementioned events, as well as validator set updates (if any). + +## Next {hide} + +Learn more about [`message`s and `queries`](./messages-and-queries.md) {hide} diff --git a/docs/building-modules/querier.md b/docs/building-modules/querier.md new file mode 100644 index 000000000000..f839a2bef266 --- /dev/null +++ b/docs/building-modules/querier.md @@ -0,0 +1,53 @@ +--- +order: 5 +synopsis: "A `Querier` designates a function that processes [`queries`](./messages-and-queries.md#queries). `querier`s are specific to the module in which they are defined, and only process `queries` defined within said module. They are called from `baseapp`'s [`Query` method](../core/baseapp.md#query)." +--- + +# Queriers + +## Pre-requisite Readings {hide} + +- [Module Manager](./module-manager.md) {prereq} +- [Messages and Queries](./messages-and-queries.md) {prereq} + +## `Querier` type + +The `querier` type defined in the Cosmos SDK specifies the typical structure of a `querier` function: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/queryable.go#L6 + +Let us break it down: + +- The `path` is an array of `string`s that contains the type of the query, and that can also contain `query` arguments. See [`queries`](./messages-and-queries.md#queries) for more information. +- The `req` itself is primarily used to retrieve arguments if they are too large to fit in the `path`. This is done using the `Data` field of `req`. +- The [`Context`](../core/context.md) contains all the necessary information needed to process the `query`, as well as a cache-wrapped copy of the latest state. It is primarily used by the [`keeper`](./keeper.md) to access the state. +- The result `res` returned to `baseapp`, marhsalled using the application's [`codec`](../core/encoding.md). + +## Implementation of a module `querier`s + +Module `querier`s are typically implemented in a `./internal/keeper/querier.go` file inside the module's folder. The [module manager](./module-manager.md) is used to add the module's `querier`s to the [application's `queryRouter`](../core/baseapp.md#query-routing) via the `NewQuerier()` method. Typically, the manager's `NewQuerier()` method simply calls a `NewQuerier()` method defined in `keeper/querier.go`, which looks like the following: + +```go +func NewQuerier(keeper Keeper) sdk.Querier { + return func(ctx sdk.Context, path []string, req abci.RequestQuery) (res []byte, err sdk.Error) { + switch path[0] { + case QueryType1: + return queryType1(ctx, path[1:], req, keeper) + case QueryType2: + return queryType2(ctx, path[1:], req, keeper) + default: + return nil, sdk.ErrUnknownRequest("unknown nameservice query endpoint") + } + } +} +``` + +This simple switch returns a `querier` function specific to the type of the received `query`. At this point of the [query lifecycle](../interfaces/query-lifecycle.md), the first element of the `path` (`path[0]`) contains the type of the query. The following elements are either empty or contain arguments needed to process the query. + +The `querier` functions themselves are pretty straighforward. They generally fetch a value or values from the state using the [`keeper`](./keeper.md). Then, they marshall the value(s) using the [`codec`](../core/encoding.md) and return the `[]byte` obtained as result. + +For a deeper look at `querier`s, see this [example implementation of a `querier` function](https://github.com/cosmos/sdk-application-tutorial/blob/c6754a1e313eb1ed973c5c91dcc606f2fd288811/x/nameservice/internal/keeper/querier.go) from the nameservice tutorial. + +## Next {hide} + +Learn about [`BeginBlocker` and `EndBlocker`](./beginblock-endblock.md) {hide} diff --git a/docs/building-modules/structure.md b/docs/building-modules/structure.md index 8b0f62c0e825..7ae32f2dde82 100644 --- a/docs/building-modules/structure.md +++ b/docs/building-modules/structure.md @@ -1,8 +1,9 @@ -# Module Specification +--- +order: 12 +synopsis: This document outlines the recommended structure of Cosmos SDK modules. These ideas are meant to be applied as suggestions. Application developers are encouraged to improve upon and contribute to module structure and development design. +--- -This document outlines the recommended structure of Cosmos SDK modules. These -ideas are meant to be applied as suggestions. Application developers are encouraged -to improve upon and contribute to module structure and development design. +# Recommended Folder Structure ## Structure @@ -79,3 +80,7 @@ allows for greater freedom of development while maintaining API stability. - `module.go`: The module's implementation of the `AppModule` and `AppModuleBasic` interfaces. - `simulation.go`: The module's simulation messages and related types (if any). + +## Next {hide} + +Learn about [interfaces](../interfaces/interfaces-intro.md) {hide} \ No newline at end of file diff --git a/docs/cn/README.md b/docs/cn/README.md index e3bd9ce98876..bbd14a3109f3 100644 --- a/docs/cn/README.md +++ b/docs/cn/README.md @@ -1,3 +1,8 @@ +--- +parent: + order: false +--- + # Cosmos SDK 文档 ## 开始 diff --git a/docs/core/README.md b/docs/core/README.md new file mode 100644 index 000000000000..6d865e79a8ff --- /dev/null +++ b/docs/core/README.md @@ -0,0 +1,20 @@ +--- +order: false +parent: + order: 3 +--- + +# Core Concepts + +This repository contains reference documentation on the core conepts of the Cosmos SDK. + +1. [`Baseapp`](./baseapp.md) +2. [Transaction](./transactions.md) +3. [Context](./context.md) +4. [Node Client](./node.md) +5. [Store](./store.md) +6. [Encoding](./encoding.md) +7. [Events](./events.md) +8. [Object-Capabilities](./ocap.md) + +After reading about the core concepts, head on to the [Building Modules documentation](../building-modules/README.md) to learn more about the process of building modules. \ No newline at end of file diff --git a/docs/core/baseapp.md b/docs/core/baseapp.md index 2a0a06a4a836..add0b049caf5 100644 --- a/docs/core/baseapp.md +++ b/docs/core/baseapp.md @@ -1,45 +1,14 @@ -# BaseApp - -## Pre-requisite Reading - -- [Anatomy of an SDK application](../basics/app-anatomy.md) -- [Lifecycle of an SDK transaction](../basics/tx-lifecycle.md) - -## Synopsis - -This document describes `BaseApp`, the abstraction that implements the core -functionalities of an SDK application. - -- [BaseApp](#baseapp) - - [Pre-requisite Reading](#pre-requisite-reading) - - [Synopsis](#synopsis) - - [Introduction](#introduction) - - [Type Definition](#type-definition) - - [Constructor](#constructor) - - [States](#states) - - [InitChain](#initchain) - - [CheckTx](#checktx) - - [BeginBlock](#beginblock) - - [DeliverTx](#delivertx) - - [Commit](#commit) - - [Routing](#routing) - - [Message Routing](#message-routing) - - [Query Routing](#query-routing) - - [Main ABCI Messages](#main-abci-messages) - - [CheckTx](#checktx-1) - - [RecheckTx](#rechecktx) - - [DeliverTx](#delivertx-1) - - [RunTx, AnteHandler and RunMsgs](#runtx-antehandler-and-runmsgs) - - [RunTx](#runtx) - - [AnteHandler](#antehandler) - - [RunMsgs](#runmsgs) - - [Other ABCI Messages](#other-abci-messages) - - [InitChain](#initchain-1) - - [BeginBlock](#beginblock-1) - - [EndBlock](#endblock) - - [Commit](#commit-1) - - [Info](#info) - - [Query](#query) +--- +order: 1 +synopsis: This document describes `BaseApp`, the abstraction that implements the core functionalities of an SDK application. +--- + +# Baseapp + +## Pre-requisite Readings {hide} + +- [Anatomy of an SDK application](../basics/app-anatomy.md) {prereq} +- [Lifecycle of an SDK transaction](../basics/tx-lifecycle.md) {prereq} ## Introduction @@ -75,18 +44,19 @@ management logic. ## Type Definition -The [`BaseApp` type](https://github.com/cosmos/cosmos-sdk/blob/master/baseapp/baseapp.go#L53) holds -many important parameters for any Cosmos SDK based application. Let us go through the most -important components. +The `BaseApp` type holds many important parameters for any Cosmos SDK based application. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/baseapp/baseapp.go#L54-L108 + +Let us go through the most important components. > __Note__: Not all parameters are described, only the most important ones. Refer to the -[type definition](https://github.com/cosmos/cosmos-sdk/blob/master/baseapp/baseapp.go#L53) for the -full list. +type definition for the full list. First, the important parameters that are initialized during the bootstrapping of the application: -- [`CommitMultiStore`](./store.md#commit-multi-store): This is the main store of the application, -which holds the canonical state that is committed at the [end of each block](#commit-1). This store +- [`CommitMultiStore`](./store.md#commitmultistore): This is the main store of the application, +which holds the canonical state that is committed at the [end of each block](#commit). This store is **not** cached, meaning it is not used to update the application's volatile (un-committed) states. The `CommitMultiStore` is a multi-store, meaning a store of stores. Each module of the application uses one or multiple `KVStores` in the multi-store to persist their subset of the state. @@ -104,7 +74,7 @@ raw transaction bytes relayed by the underlying Tendermint engine. used to persist data related to the core of the application, like consensus parameters. - [`AnteHandler`](#antehandler): This handler is used to handle signature verification, fee payment, and other pre-message execution checks when a transaction is received. It's executed during -[`CheckTx/RecheckTx`](#checktx-1) and [`DeliverTx`](#delivertx-1). +[`CheckTx/RecheckTx`](#checktx) and [`DeliverTx`](#delivertx). - [`InitChainer`](../basics/app-anatomy.md#initchainer), [`BeginBlocker` and `EndBlocker`](../basics/app-anatomy.md#beginblocker-and-endblocker): These are the functions executed when the application receives the `InitChain`, `BeginBlock` and `EndBlock` @@ -112,11 +82,11 @@ ABCI messages from the underlying Tendermint engine. Then, parameters used to define [volatile states](#volatile-states) (i.e. cached states): -- `checkState`: This state is updated during [`CheckTx`](#checktx-1), and reset on [`Commit`](#commit-1). -- `deliverState`: This state is updated during [`DeliverTx`](#delivertx-1), and set to `nil` on -[`Commit`](#commit-1) and gets re-initialized on BeginBlock. +- `checkState`: This state is updated during [`CheckTx`](#checktx), and reset on [`Commit`](#commit). +- `deliverState`: This state is updated during [`DeliverTx`](#delivertx), and set to `nil` on +[`Commit`](#commit) and gets re-initialized on BeginBlock. -Finally, a few more important parameters: +Finally, a few more important parameterd: - `voteInfos`: This parameter carries the list of validators whose precommit is missing, either because they did not vote or because the proposer did not include their vote. This information is @@ -124,7 +94,7 @@ carried by the [Context](#context) and can be used by the application for variou punishing absent validators. - `minGasPrices`: This parameter defines the minimum gas prices accepted by the node. This is a **local** parameter, meaning each full-node can set a different `minGasPrices`. It is used in the -`AnteHandler` during [`CheckTx`](#checktx-1), mainly as a spam protection mechanism. The transaction +`AnteHandler` during [`CheckTx`](#checktx), mainly as a spam protection mechanism. The transaction enters the [mempool](https://tendermint.com/docs/tendermint-core/mempool.html#transaction-ordering) only if the gas prices of the transaction are greater than one of the minimum gas price in `minGasPrices` (e.g. if `minGasPrices == 1uatom,1photon`, the `gas-price` of the transaction must be @@ -144,20 +114,18 @@ func NewBaseApp( ``` The `BaseApp` constructor function is pretty straightforward. The only thing worth noting is the -possibility to provide additional [`options`](https://github.com/cosmos/cosmos-sdk/blob/master/baseapp/options.go) +possibility to provide additional [`options`](https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/baseapp/options.go) to the `BaseApp`, which will execute them in order. The `options` are generally `setter` functions for important parameters, like `SetPruning()` to set pruning options or `SetMinGasPrices()` to set the node's `min-gas-prices`. -A list of `options` examples can be found -[here](https://github.com/cosmos/cosmos-sdk/blob/master/baseapp/options.go). Naturally, developers -can add additional `options` based on their application's needs. +Naturally, developers can add additional `options` based on their application's needs. -## States +## State Updates The `BaseApp` maintains two primary volatile states and a root or main state. The main state is the canonical state of the application and the volatile states, `checkState` and `deliverState`, -are used to handle state transitions in-between the main state made during [`Commit`](#commit-1). +are used to handle state transitions in-between the main state made during [`Commit`](#commit). Internally, there is only a single `CommitMultiStore` which we refer to as the main or root state. From this root state, we derive two volatile state through a mechanism called cache-wrapping. The @@ -165,14 +133,14 @@ types can be illustrated as follows: ![Types](./baseapp_state_types.png) -### InitChain +### InitChain State Updates During `InitChain`, the two volatile states, `checkState` and `deliverState` are set by cache-wrapping the root `CommitMultiStore`. Any subsequent reads and writes happen on cached versions of the `CommitMultiStore`. ![InitChain](./baseapp_state-initchain.png) -### CheckTx +### CheckTx State Updates During `CheckTx`, the `checkState`, which is based off of the last committed state from the root store, is used for any reads and writes. Here we only execute the `AnteHandler` and verify a router @@ -183,15 +151,15 @@ success. ![CheckTx](./baseapp_state-checktx.png) -### BeginBlock +### BeginBlock State Updates During `BeginBlock`, the `deliverState` is set for use in subsequent `DeliverTx` ABCI messages. The `deliverState` is based off of the last committed state from the root store and is cache-wrapped. -Note, the `deliverState` is set to `nil` on [`Commit`](#commit-1). +Note, the `deliverState` is set to `nil` on [`Commit`](#commit). ![BeginBlock](./baseapp_state-begin_block.png) -### DeliverTx +### DeliverTx State Updates The state flow for `DeliverTx` is nearly identical to `CheckTx` except state transitions occur on the `deliverState` and messages in a transaction are executed. Similarly to `CheckTx`, state transitions @@ -201,7 +169,7 @@ the AnteHandler are persisted. ![DeliverTx](./baseapp_state-deliver_tx.png) -### Commit +### Commit State Updates During `Commit` all the state transitions that occurred in the `deliverState` are finally written to the root `CommitMultiStore` which in turn is committed to disk and results in a new application @@ -216,28 +184,30 @@ When messages and queries are received by the application, they must be routed t ### Message Routing -`Message`s need to be routed after they are extracted from transactions, which are sent from the underlying Tendermint engine via the [`CheckTx`](#checktx) and [`DeliverTx`](#delivertx) ABCI messages. To do so, `baseapp` holds a [`router`](https://github.com/cosmos/cosmos-sdk/blob/master/baseapp/router.go) which maps `paths` (`string`) to the appropriate module `handler`. Usually, the `path` is the name of the module. +[`Message`s](#../building-modules/messages-and-queries.md#messages) need to be routed after they are extracted from transactions, which are sent from the underlying Tendermint engine via the [`CheckTx`](#checktx) and [`DeliverTx`](#delivertx) ABCI messages. To do so, `baseapp` holds a `router` which maps `paths` (`string`) to the appropriate module [`handler`](../building-modules/handler.md). Usually, the `path` is the name of the module. -The application's `router` is initialized with all the routes using the application's module manager, which itself is initialized with all the application's modules in the application's [constructor](../basics/app-anatomy.md#app-constructor). ++++ https://github.com/cosmos/cosmos-sdk/blob/master/baseapp/router.go + +The application's `router` is initilalized with all the routes using the application's [module manager](../building-modules/module-manager.md#manager), which itself is initialized with all the application's modules in the application's [constructor](../basics/app-anatomy.md#app-constructor). ### Query Routing -Similar to messages, queries need to be routed to the appropriate module's querier. To do so, `baseapp` holds a [`query router`](https://github.com/cosmos/cosmos-sdk/blob/master/baseapp/queryrouter.go), which maps `paths` (`string`) to the appropriate module `querier`. Usually, the `path` is the name of the module. +Similar to `message`s, [`queries`](../building-modules/messages-and-queries.md#queries) need to be routed to the appropriate module's [querier](../building-modules/querier.md). To do so, `baseapp` holds a `query router`, which maps module names to module `querier`s. The `queryRouter` is called during the initial stages of `query` processing, which is done via the [`Query` ABCI message](#query). -Just like the `router`, the `query router` is initialized with all the query routes using the application's module manager, which itself is initialized with all the application's modules in the application's [constructor](../basics/app-anatomy.md#app-constructor). +Just like the `router`, the `query router` is initilalized with all the query routes using the application's [module manager](../building-modules/module-manager.md), which itself is initialized with all the application's modules in the application's [constructor](../basics/app-anatomy.md#app-constructor). ## Main ABCI Messages -The [Application-Blockchain Interface](https://tendermint.com/docs/spec/abci/) (ABCI) is a generic interface that connects a state-machine with a consensus engine to form a functional full-node. It can be wrapped in any language, and needs to be implemented by each application-specific blockchain built on top of an ABCI-compatible consensus engine like Tendermint. +The [Application-Blockchain Interface](https://tendermint.com/docs/spec/abci/) (ABCI) is a generic interface that connects a state-machine with a consensus engine to form a functional full-node. It can be wrapped in any language, and needs to be implemented by each application-specific blockchain built on top of an ABCI-compatible consensus engine like Tendermint. The consensus engine handles two main tasks: - The networking logic, which mainly consists in gossiping block parts, transactions and consensus votes. -- The consensus logic, which results in the deterministic ordering of transactions in the form of blocks. +- The consensus logic, which results in the deterministic ordering of transactions in the form of blocks. -It is **not** the role of the consensus engine to define the state or the validity of transactions. Generally, transactions are handled by the consensus engine in the form of `[]bytes`, and relayed to the application via the ABCI to be decoded and processed. At keys moments in the networking and consensus processes (e.g. beginning of a block, commit of a block, reception of an unconfirmed transaction, ...), the consensus engine emits ABCI messages for the state-machine to act on. +It is **not** the role of the consensus engine to define the state or the validity of transactions. Generally, transactions are handled by the consensus engine in the form of `[]bytes`, and relayed to the application via the ABCI to be decoded and processed. At keys moments in the networking and consensus processes (e.g. beginning of a block, commit of a block, reception of an unconfirmed transaction, ...), the consensus engine emits ABCI messages for the state-machine to act on. -Developers building on top of the Cosmos SDK need not implement the ABCI themselves, as all the ABCI messages are implemented as a set of `baseapp`'s methods in the Cosmos SDK. Let us go through the main ABCI messages that `baseapp` handles: [`CheckTx`](#checktx) and [`DeliverTx`](#delivertx). Note that these ABCI messages are different from the `message`s contained in `transactions`, the purpose of which is to trigger state-transitions. +Developers building on top of the Cosmos SDK need not implement the ABCI themselves, as `baseapp` comes with a built-in implementation of the interface. Let us go through the main ABCI messages that `baseapp` implements: [`CheckTx`](#checktx) and [`DeliverTx`](#delivertx) ### CheckTx @@ -247,24 +217,24 @@ transaction is received by a full-node. The role of `CheckTx` is to guard the fu Unconfirmed transactions are relayed to peers only if they pass `CheckTx`. `CheckTx()` can perform both _stateful_ and _stateless_ checks, but developers should strive to -make them lightweight. In the Cosmos SDK, after decoding transactions, `CheckTx()` is implemented +make them lightweight. In the Cosmos SDK, after [decoding transactions](./encoding.md), `CheckTx()` is implemented to do the following checks: 1. Extract the `message`s from the transaction. 2. Perform _stateless_ checks by calling `ValidateBasic()` on each of the `messages`. This is done first, as _stateless_ checks are less computationally expensive than _stateful_ checks. If `ValidateBasic()` fail, `CheckTx` returns before running _stateful_ checks, which saves resources. -3. Perform non-module related _stateful_ checks on the account. This step is mainly about checking +3. Perform non-module related _stateful_ checks on the [account](../basics/accounts.md). This step is mainly about checking that the `message` signatures are valid, that enough fees are provided and that the sending account - has enough funds to pay for said fees. Note that no precise `gas` counting occurs here, - as `message`s are not processed. Usually, the `AnteHandler` will check that the `gas` provided + has enough funds to pay for said fees. Note that no precise [`gas`](../basics/gas-fees.md) counting occurs here, + as `message`s are not processed. Usually, the [`AnteHandler`](../basics/gas-fees.md#antehandler) will check that the `gas` provided with the transaction is superior to a minimum reference gas amount based on the raw transaction size, in order to avoid spam with transactions that provide 0 gas. 4. Ensure that a [`Route`](#message-routing) exists for each `message`, but do **not** actually process `message`s. `Message`s only need to be processed when the canonical state need to be updated, which happens during `DeliverTx`. -Steps 2. and 3. are performed by the `AnteHandler` in the [`RunTx()`](<#runtx()-,antehandler-and-runmsgs()>) +Steps 2. and 3. are performed by the [`AnteHandler`](../basics/gas-fees.md#antehandler) in the [`RunTx()`](#runtx-antehandler-and-runmsgs) function, which `CheckTx()` calls with the `runTxModeCheck` mode. During each step of `CheckTx()`, a special [volatile state](#volatile-states) called `checkState` is updated. This state is used to keep track of the temporary changes triggered by the `CheckTx()` calls of each transaction without modifying @@ -279,13 +249,14 @@ is actually included in a block, because `checkState` never gets committed to th `CheckTx` returns a response to the underlying consensus engine of type [`abci.ResponseCheckTx`](https://tendermint.com/docs/spec/abci/abci.html#messages). The response contains: -- `Code (uint32)`: Response Code. `0` if successful. +- `Code (uint32)`: Response Code. `0` if successful. - `Data ([]byte)`: Result bytes, if any. - `Log (string):` The output of the application's logger. May be non-deterministic. - `Info (string):` Additional information. May be non-deterministic. -- `GasWanted (int64)`: Amount of gas requested for transaction. It is provided by users when they generate the transaction. -- `GasUsed (int64)`: Amount of gas consumed by transaction. During `CheckTx`, this value is computed by multiplying the standard cost of a transaction byte by the size of the raw transaction (click [here](https://github.com/cosmos/cosmos-sdk/blob/master/x/auth/ante.go#L101) for an example). -- `Events ([]Event)`: Key-Value events for filtering and indexing transactions (eg. by account or message type). +- `GasWanted (int64)`: Amount of gas requested for transaction. It is provided by users when they generate the transaction. +- `GasUsed (int64)`: Amount of gas consumed by transaction. During `CheckTx`, this value is computed by multiplying the standard cost of a transaction byte by the size of the raw transaction. Next is an example: + +++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/x/auth/ante/basic.go#L104 +- `Events ([]cmn.KVPair)`: Key-Value tags for filtering and indexing transactions (eg. by account). See [`event`s](./events.md) for more. - `Codespace (string)`: Namespace for the Code. #### RecheckTx @@ -301,57 +272,69 @@ This allows certain checks like signature verification can be skipped during `Ch When the underlying consensus engine receives a block proposal, each transaction in the block needs to be processed by the application. To that end, the underlying consensus engine sends a `DeliverTx` message to the application for each transaction in a sequential order. -Before the first transaction of a given block is processed, a [volatile state](#volatile-states) called `deliverState` is initialized during [`BeginBlock`](#beginblock). This state is updated each time a transaction is processed via `DeliverTx()`, and committed to the [main state](#main-state) when the block is [committed](#commit), after what is is set to `nil`. +Before the first transaction of a given block is processed, a [volatile state](#volatile-states) called `deliverState` is intialized during [`BeginBlock`](#beginblock). This state is updated each time a transaction is processed via `DeliverTx`, and committed to the [main state](#main-state) when the block is [committed](#commit), after what is is set to `nil`. `DeliverTx` performs the **exact same steps as `CheckTx`**, with a little caveat at step 3 and the addition of a fifth step: 1. The `AnteHandler` does **not** check that the transaction's `gas-prices` is sufficient. That is because the `min-gas-prices` value `gas-prices` is checked against is local to the node, and therefore what is enough for one full-node might not be for another. This means that the proposer can potentially include transactions for free, although they are not incentivised to do so, as they earn a bonus on the total fee of the block they propose. -2. For each `message` in the transaction, route to the appropriate module's `handler`. Additional _stateful_ checks are performed, and the cache-wrapped multistore held in `deliverState`'s `context` is updated by the module's `keeper`. If the `handler` returns successfully, the cache-wrapped multistore held in `context` is written to `deliverState` `CacheMultiStore`. +2. For each `message` in the transaction, route to the appropriate module's [`handler`](../building-modules/handler.md). Additional _stateful_ checks are performed, and the cache-wrapped multistore held in `deliverState`'s `context` is updated by the module's `keeper`. If the `handler` returns successfully, the cache-wrapped multistore held in `context` is written to `deliverState` `CacheMultiStore`. + +During step 5., each read/write to the store increases the value of `GasConsumed`. You can find the default cost of each operation: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/types/gas.go#L142-L150 -During step 5., each read/write to the store increases the value of `GasConsumed`. You can find the default cost of each operation [here](https://github.com/cosmos/cosmos-sdk/blob/master/store/types/gas.go#L142-L150). At any point, if `GasConsumed > GasWanted`, the function returns with `Code != 0` and `DeliverTx()` fails. +At any point, if `GasConsumed > GasWanted`, the function returns with `Code != 0` and `DeliverTx` fails. -`DeliverTx` returns a response to the underlying consensus engine of type [`abci.ResponseCheckTx`](https://tendermint.com/docs/spec/abci/abci.html#messages). The response contains: +`DeliverTx` returns a response to the underlying consensus engine of type [`abci.ResponseDeliverTx`](https://tendermint.com/docs/spec/abci/abci.html#delivertx). The response contains: -- `Code (uint32)`: Response Code. `0` if successful. +- `Code (uint32)`: Response Code. `0` if successful. - `Data ([]byte)`: Result bytes, if any. - `Log (string):` The output of the application's logger. May be non-deterministic. - `Info (string):` Additional information. May be non-deterministic. -- `GasWanted (int64)`: Amount of gas requested for transaction. It is provided by users when they generate the transaction. -- `GasUsed (int64)`: Amount of gas consumed by transaction. During `DeliverTx`, this value is computed by multiplying the standard cost of a transaction byte by the size of the raw transaction (click [here](https://github.com/cosmos/cosmos-sdk/blob/master/x/auth/ante.go#L101) for an example), and by adding gas each time a read/write to the store occurs. -- `Tags ([]cmn.KVPair)`: Key-Value tags for filtering and indexing transactions (eg. by account). +- `GasWanted (int64)`: Amount of gas requested for transaction. It is provided by users when they generate the transaction. +- `GasUsed (int64)`: Amount of gas consumed by transaction. During `DeliverTx`, this value is computed by multiplying the standard cost of a transaction byte by the size of the raw transaction, and by adding gas each time a read/write to the store occurs. +- `Events ([]cmn.KVPair)`: Key-Value tags for filtering and indexing transactions (eg. by account). See [`event`s](./events.md) for more. - `Codespace (string)`: Namespace for the Code. ## RunTx, AnteHandler and RunMsgs ### RunTx -`RunTx()` is called from `CheckTx()`/`DeliverTx()` to handle the transaction, with `runTxModeCheck` or `runTxModeDeliver` as parameter to differentiate between the two modes of execution. Note that when `RunTx()` receives a transaction, it has already been decoded. +`RunTx` is called from `CheckTx`/`DeliverTx` to handle the transaction, with `runTxModeCheck` or `runTxModeDeliver` as parameter to differentiate between the two modes of execution. Note that when `RunTx` receives a transaction, it has already been decoded. -The first thing `RunTx()` does upon being called is to retrieve the `context`'s `CacheMultiStore` by calling the `getContextForTx()` function with the appropriate mode (either `runTxModeCheck` or `runTxModeDeliver`). This `CacheMultiStore` is a cached version of the main store instantiated during `BeginBlock` for `DeliverTx` and during the `Commit` of the previous block for `CheckTx`. After that, two `defer func()` are called for `gas` management. They are executed when `RunTx()` returns and make sure `gas` is actually consumed, and will throw errors, if any. +The first thing `RunTx` does upon being called is to retrieve the `context`'s `CacheMultiStore` by calling the `getContextForTx()` function with the appropriate mode (either `runTxModeCheck` or `runTxModeDeliver`). This `CacheMultiStore` is a cached version of the main store instantiated during `BeginBlock` for `DeliverTx` and during the `Commit` of the previous block for `CheckTx`. After that, two `defer func()` are called for [`gas`](../basics/gas-fees.md) management. They are executed when `runTx` returns and make sure `gas` is actually consumed, and will throw errors, if any. After that, `RunTx()` calls `ValidateBasic()` on each `message`in the `Tx`, which runs preliminary _stateless_ validity checks. If any `message` fails to pass `ValidateBasic()`, `RunTx()` returns with an error. -Then, the [`anteHandler`](#antehandler) of the application is run (if it exists). In preparation of this step, both the `checkState`/`deliverState`'s `context` and `context`'s `CacheMultiStore` are cached-wrapped using the [`cacheTxContext()`](https://github.com/cosmos/cosmos-sdk/blob/master/baseapp/baseapp.go#L781-L798) function. This allows `RunTx()` not to commit the changes made to the state during the execution of `anteHandler` if it ends up failing. It also prevents the module implementing the `anteHandler` from writing to state, which is an important part of the [object-capabilities](./ocap.md) of the Cosmos SDK. +Then, the [`anteHandler`](#antehandler) of the application is run (if it exists). In preparation of this step, both the `checkState`/`deliverState`'s `context` and `context`'s `CacheMultiStore` are cached-wrapped using the `cacheTxContext()` function. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/baseapp/baseapp.go#L587 + +This allows `RunTx` not to commit the changes made to the state during the execution of `anteHandler` if it ends up failing. It also prevents the module implementing the `anteHandler` from writing to state, which is an important part of the [object-capabilities](./ocap.md) of the Cosmos SDK. Finally, the [`RunMsgs()`](#runmsgs) function is called to process the `messages`s in the `Tx`. In preparation of this step, just like with the `anteHandler`, both the `checkState`/`deliverState`'s `context` and `context`'s `CacheMultiStore` are cached-wrapped using the `cacheTxContext()` function. ### AnteHandler -The `AnteHandler` is a special handler that implements the [`anteHandler` interface](https://github.com/cosmos/cosmos-sdk/blob/master/types/handler.go#L8) and is used to authenticate the transaction before the transaction's internal messages are processed. +The `AnteHandler` is a special handler that implements the `anteHandler` interface and is used to authenticate the transaction before the transaction's internal messages are processed. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/handler.go#L8 The `AnteHandler` is theoretically optional, but still a very important component of public blockchain networks. It serves 3 primary purposes: -- Be a primary line of defense against spam and second line of defense (the first one being the mempool) against transaction replay with fees deduction and `sequence`checking. -- Perform preliminary _stateful_ validity checks like ensuring signatures are valid or that the sender has enough funds to pay for fees. -- Play a role in the incentivisation of stakeholders via the collection of transaction fees. +- Be a primary line of defense against spam and second line of defense (the first one being the mempool) against transaction replay with fees deduction and [`sequence`](./transactions.md#transaction-generation) checking. +- Perform preliminary *stateful* validity checks like ensuring signatures are valid or that the sender has enough funds to pay for fees. +- Play a role in the incentivisation of stakeholders via the collection of transaction fees. + +`baseapp` holds an `anteHandler` as paraemter, which is initialized in the [application's constructor](../basics/app-anatomy.md#application-constructor). The most widely used `anteHandler` today is that of the [`auth` module](https://github.com/cosmos/cosmos-sdk/blob/master/x/auth/ante/ante.go). -`baseapp` holds an `anteHandler` as parameter, which is initialized in the [application's constructor](../basics/app-anatomy.md#application-constructor). The most widely used `anteHandler` today is that of the [`auth` module](https://github.com/cosmos/cosmos-sdk/blob/master/x/auth/ante.go). +Click [here](../basics/gas-fees.md#antehandler) for more on the `anteHandler`. ### RunMsgs -`RunMsgs()` is called from `RunTx()` with `runTxModeCheck` as parameter to check the existence of a route for each message contained in the transaction, and with `runTxModeDeliver` to actually process the `message`s. +`RunMsgs` is called from `RunTx` with `runTxModeCheck` as parameter to check the existence of a route for each message the transaction, and with `runTxModeDeliver` to actually process the `message`s. -First, it retrieves the `message`'s `route` using the `Msg.Route()` method. Then, using the application's [`router`](#routing) and the `route`, it checks for the existence of a `handler`. At this point, if `mode == runTxModeCheck`, `RunMsgs()` returns. If instead `mode == runTxModeDeliver`, the `handler` function for the message is executed, before `RunMsgs()` returns. +First, it retreives the `message`'s `route` using the `Msg.Route()` method. Then, using the application's [`router`](#routing) and the `route`, it checks for the existence of a `handler`. At this point, if `mode == runTxModeCheck`, `RunMsgs` returns. If instead `mode == runTxModeDeliver`, the [`handler`](../building-modules/handler.md) function for the message is executed, before `RunMsgs` returns. ## Other ABCI Messages @@ -359,44 +342,50 @@ First, it retrieves the `message`'s `route` using the `Msg.Route()` method. Then The [`InitChain` ABCI message](https://tendermint.com/docs/app-dev/abci-spec.html#initchain) is sent from the underlying Tendermint engine when the chain is first started. It is mainly used to **initialize** parameters and state like: -- [Consensus Parameters](https://tendermint.com/docs/spec/abci/apps.html#consensus-parameters) via `setConsensusParams`. +- [Consensus Parameters](https://tendermint.com/docs/spec/abci/apps.html#consensus-parameters) via `setConsensusParams`. - [`checkState` and `deliverState`](#volatile-states) via `setCheckState` and `setDeliverState`. -- The block gas meter, with infinite gas to process genesis transactions. +- The [block gas meter](../basics/gas-fees.md#block-gas-meter), with infinite gas to process genesis transactions. -Finally, the `InitChain(req abci.RequestInitChain)` method of `baseapp` calls the [`initChainer()`](../basics/app-anatomy.md#initchainer) of the application in order to initialize the main state of the application from the [`genesis file`](./genesis.md) and, if defined, call the `InitGenesis` function of each of the application's modules. +Finally, the `InitChain(req abci.RequestInitChain)` method of `baseapp` calls the [`initChainer()`](../basics/app-anatomy.md#initchainer) of the application in order to initialize the main state of the application from the `genesis file` and, if defined, call the [`InitGenesis`](../building-modules/genesis.md#initgenesis) function of each of the application's modules. ### BeginBlock The [`BeginBlock` ABCI message](#https://tendermint.com/docs/app-dev/abci-spec.html#beginblock) is sent from the underlying Tendermint engine when a block proposal created by the correct proposer is received, before [`DeliverTx`](#delivertx) is run for each transaction in the block. It allows developers to have logic be executed at the beginning of each block. In the Cosmos SDK, the `BeginBlock(req abci.RequestBeginBlock)` method does the following: -- Initialize [`deliverState`](#volatile-states) with the latest header using the `req abci.RequestBeginBlock` passed as parameter via the [`setDeliverState`](https://github.com/cosmos/cosmos-sdk/blob/master/baseapp/baseapp.go#L283-L289) function. -- Initialize the block gas meter with the `maxGas` limit. The `gas` consumed within the block cannot go above `maxGas`. This parameter is defined in the application's consensus parameters. -- Run the application's [`begingBlocker()`](../basics/app-anatomy.md#beginblocker-and-endblock), which mainly runs the `BeginBlocker()` method of each of the application's modules. -- Set the [`VoteInfos`](https://tendermint.com/docs/app-dev/abci-spec.html#voteinfo) of the application, i.e. the list of validators whose _precommit_ for the previous block was included by the proposer of the current block. This information is carried into the [`Context`](./context.md) so that it can be used during `DeliverTx` and `EndBlock`. +- Initialize [`deliverState`](#volatile-states) with the latest header using the `req abci.RequestBeginBlock` passed as parameter via the `setDeliverState` function. + +++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/baseapp/baseapp.go#L387-L397 +This function also resets the [main gas meter](../basics/gas-fees.md#main-gas-meter). +- Initialize the [block gas meter](../basics/gas-fees.md#block-gas-meter) with the `maxGas` limit. The `gas` consumed within the block cannot go above `maxGas`. This parameter is defined in the application's consensus parameters. +- Run the application's [`beginBlocker()`](../basics/app-anatomy.md#beginblocker-and-endblock), which mainly runs the [`BeginBlocker()`](../building-modules/beginblock-endblock.md#beginblock) method of each of the application's modules. +- Set the [`VoteInfos`](https://tendermint.com/docs/app-dev/abci-spec.html#voteinfo) of the application, i.e. the list of validators whose *precommit* for the previous block was included by the proposer of the current block. This information is carried into the [`Context`](./context.md) so that it can be used during `DeliverTx` and `EndBlock`. ### EndBlock -The [`EndBlock` ABCI message](#https://tendermint.com/docs/app-dev/abci-spec.html#endblock) is sent from the underlying Tendermint engine after [`DeliverTx`](#delivertx) as been run for each transaction n the block. It allows developers to have logic be executed at the end of each block. In the Cosmos SDK, the bulk `EndBlock(req abci.RequestEndBlock)` method is to run the application's [`endBlocker()`](../basics/app-anatomy.md#beginblocker-and-endblock), which mainly runs the `EndBlocker()` method of each of the application's modules. +The [`EndBlock` ABCI message](#https://tendermint.com/docs/app-dev/abci-spec.html#endblock) is sent from the underlying Tendermint engine after [`DeliverTx`](#delivertx) as been run for each transaction in the block. It allows developers to have logic be executed at the end of each block. In the Cosmos SDK, the bulk `EndBlock(req abci.RequestEndBlock)` method is to run the application's [`EndBlocker()`](../basics/app-anatomy.md#beginblocker-and-endblock), which mainly runs the [`EndBlocker()`](../building-modules/beginblock-endblock.md#beginblock) method of each of the application's modules. ### Commit -The [`Commit` ABCI message](https://tendermint.com/docs/app-dev/abci-spec.html#commit) is sent from the underlying Tendermint engine after the full-node has received _precommits_ from 2/3+ of validators (weighted by voting power). On the `baseapp` end, the `Commit(res abci.ResponseCommit)` function is implemented to commit all the valid state transitions that occured during `BeginBlock()`, `DeliverTx()` and `EndBlock()` and to reset state for the next block. +The [`Commit` ABCI message](https://tendermint.com/docs/app-dev/abci-spec.html#commit) is sent from the underlying Tendermint engine after the full-node has received *precommits* from 2/3+ of validators (weighted by voting power). On the `baseapp` end, the `Commit(res abci.ResponseCommit)` function is implemented to commit all the valid state transitions that occured during `BeginBlock`, `DeliverTx` and `EndBlock` and to reset state for the next block. -To commit state-transitions, the `Commit` function calls the `Write()` function on `deliverState.ms`, where `deliverState.ms` is a cached multistore of the main store `app.cms`. Then, the `Commit` function sets `checkState` to the latest header (obtained from `deliverState.ctx.BlockHeader`) and `deliverState` to `nil`. +To commit state-transitions, the `Commit` function calls the `Write()` function on `deliverState.ms`, where `deliverState.ms` is a cached multistore of the main store `app.cms`. Then, the `Commit` function sets `checkState` to the latest header (obtbained from `deliverState.ctx.BlockHeader`) and `deliverState` to `nil`. -Finally, `Commit` returns the hash of the commitment of `app.cms` back to the underlying consensus engine. This hash is used as a reference in the header of the next block. +Finally, `Commit` returns the hash of the commitment of `app.cms` back to the underlying consensus engine. This hash is used as a reference in the header of the next block. ### Info -The [`Info` ABCI message](https://tendermint.com/docs/app-dev/abci-spec.html#info) is a simple query from the underlying consensus engine, notably used to sync the latter with the application during a handshake that happens on startup. When called, the `Info(res abci.ResponseInfo)` function from `baseapp` will return the application's name, version and the hash of the last commit of `app.cms`. +The [`Info` ABCI message](https://tendermint.com/docs/app-dev/abci-spec.html#info) is a simple query from the underlying consensus engine, notably used to sync the latter with the application during a handshake that happens on startup. When called, the `Info(res abci.ResponseInfo)` function from `baseapp` will return the application's name, version and the hash of the last commit of `app.cms`. -### Query +### Query -The [`Query` ABCI message](https://tendermint.com/docs/app-dev/abci-spec.html#query) is used to serve queries received from the underlying consensus engine, including queries received via RPC like Tendermint RPC. It is the main entrypoint to build interfaces with the application. The application must respect a few rules when implementing the `Query` method, which are outlined [here](https://tendermint.com/docs/app-dev/abci-spec.html#query). +The [`Query` ABCI message](https://tendermint.com/docs/app-dev/abci-spec.html#query) is used to serve queries received from the underlying consensus engine, including queries received via RPC like Tendermint RPC. It is the main entrypoint to build interfaces with the application. The application must respect a few rules when implementing the `Query` method, which are outlined [here](https://tendermint.com/docs/app-dev/abci-spec.html#query). -The `baseapp` implementation of the `Query(req abci.RequestQuery)` method is a simple dispatcher serving 4 main categories of queries: +Each `query` comes with a `path`, which contains multiple `string`s. By convention, the first element of the `path` (`path[0]`) contains the category of `query` (`app`, `p2p`, `store` or `custom`). The `baseapp` implementation of the `Query(req abci.RequestQuery)` method is a simple dispatcher serving these 4 main categories of queries: - Application-related queries like querying the application's version, which are served via the `handleQueryApp` method. -- Direct queries to the multistore, which are served by the `handlerQueryStore` method. These direct queries are different from custom queries which go through `app.queryRouter`, and are mainly used by third-party service provider like block explorers. +- Direct queries to the multistore, which are served by the `handlerQueryStore` method. These direct queryeis are different from custom queries which go through `app.queryRouter`, and are mainly used by third-party service provider like block explorers. - P2P queries, which are served via the `handleQueryP2P` method. These queries return either `app.addrPeerFilter` or `app.ipPeerFilter` that contain the list of peers filtered by address or IP respectively. These lists are first initialized via `options` in `baseapp`'s [constructor](#constructor). - Custom queries, which encompass most queries, are served via the `handleQueryCustom` method. The `handleQueryCustom` cache-wraps the multistore before using the `queryRoute` obtained from [`app.queryRouter`](#query-routing) to map the query to the appropriate module's `querier`. + +## Next {hide} + +Learn more about [transactions](./transactions.md) {hide} \ No newline at end of file diff --git a/docs/core/context.md b/docs/core/context.md new file mode 100644 index 000000000000..e501834a911f --- /dev/null +++ b/docs/core/context.md @@ -0,0 +1,117 @@ +--- +order: 3 +synopsis: The `context` is a data structure intended to be passed from function to function that carries information about the current state of the application. It holds a cached copy of the entire state as well as useful objects and information like `gasMeter`, `block height`, `consensus parameters` and more. +--- + +# Context + +## Pre-requisites Readings {hide} + +- [Anatomy of an SDK Application](../basics/app-anatomy.md) {prereq} +- [Lifecycle of a Transaction](../basics/tx-lifecycle.md) {prereq} + +## Context Definition + +The SDK `Context` is a custom data structure that contains Go's stdlib [`context`](https://golang.org/pkg/context) as its base, and has many additional types within its definition that are specific to the Cosmos SDK. he `Context` is integral to transaction processing in that it allows modules to easily access their respective [store](./store.md#base-layer-kvstores) in the [`multistore`](./store.md#multistore) and retrieve transactional context such as the block header and gas meter. + +```go +type Context struct { + ctx context.Context + ms MultiStore + header abci.Header + chainID string + txBytes []byte + logger log.Logger + voteInfo []abci.VoteInfo + gasMeter GasMeter + blockGasMeter GasMeter + checkTx bool + minGasPrice DecCoins + consParams *abci.ConsensusParams + eventManager *EventManager +} +``` + +- **Context:** The base type is a Go [Context](https://golang.org/pkg/context), which is explained further in the [Go Context Package](#go-context-package) section below. +- **Multistore:** Every application's `BaseApp` contains a [`CommitMultiStore`](./store.md#multistore) which is provided when a `Context` is created. Calling the `KVStore()` and `TransientStore()` methods allows modules to fetch their respective [`KVStore`](./store.md#base-layer-kvstores) using their unique `StoreKey`. +- **ABCI Header:** The [header](https://tendermint.com/docs/spec/abci/abci.html#header) is an ABCI type. It carries important information about the state of the blockchain, such as block height and proposer of the current block. +- **Chain ID:** The unique identification number of the blockchain a block pertains to. +- **Transaction Bytes:** The `[]byte` representation of a transaction being processed using the context. Every transaction is processed by various parts of the SDK and consensus engine (e.g. Tendermint) throughout its [lifecycle](../basics/tx-lifecycle.md), some of which to not have any understanding of transaction types. Thus, transactions are marshaled into the generic `[]byte` type using some kind of [encoding format](./encoding.md) such as [Amino](./encoding.md). +- **Logger:** A `logger` from the Tendermint libraries. Learn more about logs [here](https://tendermint.com/docs/tendermint-core/how-to-read-logs.html#how-to-read-logs). Modules call this method to create their own unique module-specific logger. +- **VoteInfo:** A list of the ABCI type [`VoteInfo`](https://tendermint.com/docs/spec/abci/abci.html#voteinfo), which includes the name of a validator and a boolean indicating whether they have signed the block. +- **Gas Meters:** Specifically, a [`gasMeter`](../basics/gas-fees.md#main-gas-meter) for the transaction currently being processed using the context and a [`blockGasMeter`](../basics/gas-fees.md#block-gas-meter) for the entire block it belongs to. Users specify how much in fees they wish to pay for the execution of their transaction; these gas meters keep track of how much [gas](../basics/gas-fees.md) has been used in the transaction or block so far. If the gas meter runs out, execution halts. +- **CheckTx Mode:** A boolean value indicating whether a transaction should be processed in `CheckTx` or `DeliverTx` mode. +- **Min Gas Price:** The minimum [gas](../basics/gas-fees.md) price a node is willing to take in order to include a transaction in its block. This price is a local value configured by each node individually, and should therefore **not be used in any functions used in sequences leading to state-transitions**. +- **Consensus Params:** The ABCI type [Consensus Parameters](https://tendermint.com/docs/spec/abci/apps.html#consensus-parameters), which specify certain limits for the blockchain, such as maximum gas for a block. +- **Event Manager:** The event manager allows any caller with access to a `Context` to emit [`Events`](./events.md). Modules may define module specific +`Events` by defining various `Types` and `Attributes` or use the common definitions found in `types/`. Clients can subscribe or query for these `Events`. These `Events` are collected throughout `DeliverTx`, `BeginBlock`, and `EndBlock` and are returned to Tendermint for indexing. For example: + +```go +ctx.EventManager().EmitEvent(sdk.NewEvent( + sdk.EventTypeMessage, + sdk.NewAttribute(sdk.AttributeKeyModule, types.AttributeValueCategory)), +) +``` + +## Go Context Package + +A basic `Context` is defined in the [Golang Context Package](https://golang.org/pkg/context). A `Context` +is an immutable data structure that carries request-scoped data across APIs and processes. Contexts +are also designed to enable concurrency and to be used in goroutines. + +Contexts are intended to be **immutable**; they should never be edited. Instead, the convention is +to create a child context from its parent using a `With` function. For example: + +``` go +childCtx = parentCtx.WithBlockHeader(header) +``` + +The [Golang Context Package](https://golang.org/pkg/context) documentation instructs developers to +explicitly pass a context `ctx` as the first argument of a process. + +## Cache Wrapping + +The `Context` contains a `MultiStore`, which allows for cache-wrapping functionality: a `CacheMultiStore` +where each `KVStore` is is wrapped with an ephemeral cache. Processes are free to write changes to +the `CacheMultiStore`, then write the changes back to the original state or disregard them if something +goes wrong. The pattern of usage for a Context is as follows: + +1. A process receives a Context `ctx` from its parent process, which provides information needed to + perform the process. +2. The `ctx.ms` is **cache wrapped**, i.e. a cached copy of the [multistore](./store.md#multistore) is made so that the process can make changes to the state as it executes, without changing the original`ctx.ms`. This is useful to protect the underlying multistore in case the changes need to be reverted at some point in the execution. +3. The process may read and write from `ctx` as it is executing. It may call a subprocess and pass +`ctx` to it as needed. +4. When a subprocess returns, it checks if the result is a success or failure. If a failure, nothing +needs to be done - the cache wrapped `ctx` is simply discarded. If successful, the changes made to +the cache-wrapped `MultiStore` can be committed to the original `ctx.ms` via `Write()`. + +For example, here is a snippet from the [`runTx`](./baseapp.md#runtx-and-runmsgs) function in +[`baseapp`](./baseapp.md): + +```go +runMsgCtx, msCache := app.cacheTxContext(ctx, txBytes) +result = app.runMsgs(runMsgCtx, msgs, mode) +result.GasWanted = gasWanted + +if mode != runTxModeDeliver { + return result +} + +if result.IsOK() { + msCache.Write() +} +``` + +Here is the process: + +1. Prior to calling `runMsgs` on the message(s) in the transaction, it uses `app.cacheTxContext()` +to cache-wrap the context and multistore. +2. The cache-wrapped context, `runMsgCtx`, is used in `runMsgs` to return a result. +3. If the process is running in [`checkTxMode`](./baseapp.md#checktx), there is no need to write the +changes - the result is returned immediately. +4. If the process is running in [`deliverTxMode`](./baseapp.md#delivertx) and the result indicates +a successful run over all the messages, the cached multistore is written back to the original. + +## Next {hide} + +Learn about the [node client](./node.md) {hide} diff --git a/docs/core/encoding.md b/docs/core/encoding.md new file mode 100644 index 000000000000..caf445511799 --- /dev/null +++ b/docs/core/encoding.md @@ -0,0 +1,44 @@ +--- +order: 6 +synopsis: The `codec` is used everywhere in the Cosmos SDK to encode and decode structs and interfaces. The specific codec used in the Cosmos SDK is called `go-amino` +--- + +# Encoding + +## Pre-requisite Readings {hide} + +- [Anatomy of an SDK application](../basics/app-anatomy.md) {prereq} + +## Encoding + +Every Cosmos SDK application exposes a global `codec` to marshal/unmarshal structs and interfaces in order to store and/or transfer them. As of now, the `codec` used in the Cosmos SDK is [go-amino](https://github.com/tendermint/go-amino), which possesses the following important properties: + +- Interface support. +- Deterministic encoding of value (which is required considering that blockchains are deterministic replicated state-machines). +- Upgradeable schemas. + +The application's `codec` is typically initialized in the [application's constructor function](../basics/app-anatomy.md#constructor-function), where it is also passed to each of the application's modules via the [basic manager](../building-modules/module-manager.md#basic-manager). + +Among other things, the `codec` is used by module's [`keeper`s](../building-modules/keeper.md) to marshal objects into `[]byte` before storing them in the module's [`KVStore`](./store.md#kvstore), or to unmarshal them from `[]byte` when retrieving them: + +```go +// typical pattern to marshal an object to []byte before storing it +bz := keeper.cdc.MustMarshalBinaryBare(object) + +//typical pattern to unmarshal an object from []byte when retrieving it +keeper.cdc.MustUnmarshalBinaryBare(bz, &object) +``` + +Alternatively, it is possible to use `MustMarshalBinaryLengthPrefixed`/`MustUnmarshalBinaryLengthPrefixed` instead of `MustMarshalBinaryBare`/`MustUnmarshalBinaryBare` for the same encoding prefixed by a `uvarint` encoding of the object to encode. + +Another important use of the `codec` is the encoding and decoding of [transactions](./transactions.md). Transactions are defined at the Cosmos SDK level, but passed to the underlying consensus engine in order to be relayed to other peers. Since the underlying consensus engine is agnostic to the application, it only accepts transactions in the form of `[]byte`. The encoding is done by an object called `TxEncoder` and the decoding by an object called `TxDecoder`. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/tx_msg.go#L45-L49 + +A standard implementation of both these objects can be found in the [`auth` module](https://github.com/cosmos/cosmos-sdk/blob/master/x/auth): + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/x/auth/types/stdtx.go#L241-L266 + +## Next {hide} + +Learn about [events](./events.md) {hide} \ No newline at end of file diff --git a/docs/core/events.md b/docs/core/events.md new file mode 100644 index 000000000000..b9eabb3161ae --- /dev/null +++ b/docs/core/events.md @@ -0,0 +1,91 @@ +--- +order: 7 +synopsis: "`Event`s are objects that contain information about the execution of the application. They are mainly used by service providers like block explorers and wallet to track the execution of various messages and index transactions." +--- + +# Events + +## Pre-Requisite Readings {hide} + +- [Anatomy of an SDK application](../basics/app-anatomy.md) {prereq} + +## Events + +`Event`s are implemented in the Cosmos SDK as an alias of the ABCI `event` type. + ++++ https://github.com/tendermint/tendermint/blob/bc572217c07b90ad9cee851f193aaa8e9557cbc7/abci/types/types.pb.go#L2661-L2667 + +They contain: + +- A **`type`** of type `string`, which can refer to the type of action that led to the `event`'s emission (e.g. a certain value going above a threshold), or to the type of `message` if the event is triggered at the end of that `message` processing. +- A list of `attributes`, which are key-value pairs that give more information about the `event`. + +++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/events.go#L51-L56 + +`Event`s are returned to the underlying consensus engine in the response of the following ABCI messages: [`CheckTx`](./baseapp.md#checktx), [`DeliverTx`](./baseapp.md#delivertx), [`BeginBlock`](./baseapp.md#beginblock) and [`EndBlock`](./baseapp.md#endblock). + +Typically, `event` `type`s and `attributes` are defined on a **per-module basis** in the module's `/internal/types/events.go` file, and triggered from the module's [`handler`](../building-modules/handler.md) via the [`EventManager`](#eventmanager). + +## EventManager + +In Cosmos SDK applications, `event`s are generally managed by an object called the `EventManager`. It is implemented as a simple wrapper around a slice of `event`s: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/events.go#L16-L20 + +The `EventManager` comes with a set of useful methods to manage `event`s. Among them, the one that is used the most by module and application developers is the `EmitEvent` method, which registers an `event` in the `EventManager`. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/events.go#L29-L31 + +Typically, module developers will implement event emission via the `EventManager` in the [`handler`](../building-modules/handler.md) of modules, as well as in the [`BeginBlocker` and/or`EndBlocker` functions](../building-modules/beginblock-endblock.md). The `EventManager` is accessed via the context [`ctx`](./context.md), and event emission generally follows this pattern: + +```go +ctx.EventManager().EmitEvent( + sdk.NewEvent( + eventType, // e.g. sdk.EventTypeMessage for a message, types.CustomEventType for a custom event defined in the module + sdk.NewAttribute(attributeKey, attributeValue), + ), + ) +``` + +See the [`handler` concept doc](../building-modules/handler.md) for a more detailed view on how to typically implement `events` and use the `EventManager` in modules. + +## Subscribing to `events` + +It is possible to subscribe to `events` via [Tendermint's Websocket](https://tendermint.com/docs/app-dev/subscribing-to-events-via-websocket.html#subscribing-to-events-via-websocket). This is done by calling the `subscribe` RPC method via Websocket: + +``` +{ + "jsonrpc": "2.0", + "method": "subscribe", + "id": "0", + "params": { + "query": "tm.event='eventCategory' AND type.attribute='attributeValue'" + } +} +``` + +The main `eventCategory` you can subscribe to are: + +- `NewBlock`: Contains `events` triggered during `BeginBlock` and `EndBlock`. +- `Tx`: Contains `events` triggered during `DeliverTx` (i.e. transaction processing). +- `ValidatorSetUpdates`: Contains validator set updates for the block. + +These events are triggered from the `state` package after a block is committed. You can get the full list of `event` categories [here](https://godoc.org/github.com/tendermint/tendermint/types#pkg-constants). + +The `type` and `attribute` value of the `query` allow you to filter the specific `event` you are looking for. For example, a `transfer` transaction triggers an `event` of type `Transfer` and has `Recipient` and `Sender` as `attributes` (as defined in the [`events` file of the `bank` module](https://github.com/cosmos/cosmos-sdk/blob/master/x/bank/internal/types/events.go)). Subscribing to this `event` would be done like so: + +``` +{ + "jsonrpc": "2.0", + "method": "subscribe", + "id": "0", + "params": { + "query": "tm.event='Tx' AND transfer.sender='senderAddress'" + } +} +``` + +where `senderAddress` is an address following the [`AccAddress`](../basics/accounts.md#addresses) format. + +## Next {hide} + +Learn about [object-capabilities](./ocap.md) {hide} \ No newline at end of file diff --git a/docs/core/node.md b/docs/core/node.md new file mode 100644 index 000000000000..5da50d6080a4 --- /dev/null +++ b/docs/core/node.md @@ -0,0 +1,70 @@ +--- +order: 4 +synopsis: The main endpoint of an SDK application is the daemon client, otherwise known as the full-node client. The full-node runs the state-machine, starting from a genesis file. It connects to peers running the same client in order to receive and relay transactions, block proposals and signatures. The full-node is constituted of the application, defined with the Cosmos SDK, and of a consensus engine connected to the application via the ABCI. +--- + +# Node Client (Daemon) + +## Pre-requisite Readings {hide} + +- [Anatomy of an SDK application](../basics/app-anatomy.md) {prereq} + +## `main` function + +The full-node client of any SDK application is built by running a `main` function. The client is generally named by appending the `-d` suffix to the application name (e.g. `appd` for an application named `app`), and the `main` function is defined in a `./cmd/appd/main.go` file. Running this function creates an executable `.appd` that comes with a set of commands. For an app named `app`, the main command is [`appd start`](#start-command), which starts the full-node. + +In general, developers will implement the `main.go` function with the following structure: + +- First, a [`codec`](./encoding.md) is instanciated for the application. +- Then, the `config` is retrieved and config parameters are set. This mainly involves setting the bech32 prefixes for [addresses and pubkeys](../basics/accounts.md#addresses-and-pubkeys). + +++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/config.go#L10-L21 +- Using [cobra](https://github.com/spf13/cobra), the root command of the full-node client is created. After that, all the custom commands of the application are added using the `AddCommand()` method of `rootCmd`. +- Add default server commands to `rootCmd` using the `server.AddCommands(ctx, cdc, rootCmd, newApp, exportAppStateAndTMValidators)` method. These commands are separated from the ones added above since they are standard and defined at SDK level. They should be shared by all SDK-based applications. They include the most important command: the [`start` command](#start-command). +- Prepare and execute the `executor`. + +++ https://github.com/tendermint/tendermint/blob/bc572217c07b90ad9cee851f193aaa8e9557cbc7/libs/cli/setup.go#L75-L78 + +See an example of `main` function from the [`gaia`](https://github.com/cosmos/gaia) application: + ++++ https://github.com/cosmos/gaia/blob/f41a660cdd5bea173139965ade55bd25d1ee3429/cmd/gaiad/main.go + +## `start` command + +The `start` command is defined in the `/server` folder of the Cosmos SDK. It is added to the root command of the full-node client in the [`main` function](#main-function) and called by the end-user to start their node: + +```go +// For an example app named "app", the following command starts the full-node + +appd start +``` + +As a reminder, the full-node is composed of three conceptual layers: the networking layer, the consensus layer and the application layer. The first two are generally bundled together in an entity called the consensus engine (Tendermint Core by default), while the third is the state-machine defined with the help of the Cosmos SDK. Currently, the Cosmos SDK uses Tendermint as the default consensus engine, meaning the start command is implemented to boot up a Tendermint node. + +The flow of the `start` command is pretty straightforward. First, it retrieves the `config` from the `context` in order to open the `db` (a [`leveldb`](https://github.com/syndtr/goleveldb) instance by default). This `db` contains the latest known state of the application (empty if the application is started from the first time. + +With the `db`, the `start` command creates a new instance of the application using an `appCreator` function: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/server/start.go#L144 + +Note that an `appCreator` is a function that fulfills the `AppCreator` signature. In practice, the [constructor the application](../basics/app-anatomy.md#constructor-function) is passed as the `appCreator`. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/server/constructors.go#L17-L25 + +Then, the instance of `app` is used to instanciate a new Tendermint node: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/server/start.go#L153-L163 + +The Tendermint node can be created with `app` because the latter satisfies the [`abci.Application` interface](https://github.com/tendermint/tendermint/blob/bc572217c07b90ad9cee851f193aaa8e9557cbc7/abci/types/application.go#L11-L26) (given that `app` extends [`baseapp`](./baseapp.md)). As part of the `NewNode` method, Tendermint makes sure that the height of the application (i.e. number of blocks since genesis) is equal to the height of the Tendermint node. The difference between these two heights should always be negative or null. If it is strictly negative, `NewNode` will replay blocks until the height of the application reaches the height of the Tendermint node. Finally, if the height of the application is `0`, the Tendermint node will call [`InitChain`](./baseapp.md#initchain) on the application to initialize the state from the genesis file. + +Once the Tendermint node is instanciated and in sync with the application, the node can be started: + +```go +if err := tmNode.Start(); err != nil { + return nil, err +} +``` + +Upon starting, the node will bootstrap its RPC and P2P server and start dialing peers. During handshake with its peers, if the node realizes they are ahead, it will query all the blocks sequentially in order to catch up. Then, it will wait for new block proposals and block signatures from validators in order to make progress. + +## Next {hide} + +Learn about the [store](./store.md) {hide} \ No newline at end of file diff --git a/docs/core/ocap.md b/docs/core/ocap.md index 8322ce4ec5dc..27e7be4a3f4e 100644 --- a/docs/core/ocap.md +++ b/docs/core/ocap.md @@ -1,13 +1,12 @@ --- -order: false +order: 8 --- # Object-Capability Model ## Intro -When thinking about security, it is good to start with a specific threat -model. Our threat model is the following: +When thinking about security, it is good to start with a specific threat model. Our threat model is the following: > We assume that a thriving ecosystem of Cosmos-SDK modules that are easy to compose into a blockchain application will contain faulty or malicious modules. @@ -67,14 +66,10 @@ var sumValue := externalModule.ComputeSumValue(*account) ``` In the Cosmos SDK, you can see the application of this principle in the -[gaia app](../gaia/app/app.go). +gaia app. -```go -// register message routes -app.Router(). - AddRoute(bank.RouterKey, bank.NewHandler(app.bankKeeper)). - AddRoute(staking.RouterKey, staking.NewHandler(app.stakingKeeper)). - AddRoute(distr.RouterKey, distr.NewHandler(app.distrKeeper)). - AddRoute(slashing.RouterKey, slashing.NewHandler(app.slashingKeeper)). - AddRoute(gov.RouterKey, gov.NewHandler(app.govKeeper)) -``` ++++ https://github.com/cosmos/gaia/blob/master/app/app.go#L197-L209 + +## Next + +Learn about [building modules](../building-modules/intro.md) {hide} \ No newline at end of file diff --git a/docs/core/store.md b/docs/core/store.md new file mode 100644 index 000000000000..9eb5e886c0bf --- /dev/null +++ b/docs/core/store.md @@ -0,0 +1,237 @@ +--- +order: 5 +synopsis: A store is a data structure that holds the state of the application. +--- + +# Store + +## Pre-requisite Readings {hide} + +- [Anatomy of an SDK application](../basics/app-anatomy.md) {prereq} + +## Introduction to SDK Stores + +The Cosmos SDK comes with a large set of stores to persist the state of applications. By default, the main store of SDK applications is a `multistore`, i.e. a store of stores. Developers can add any number of key-value stores to the multistore, depending on their application needs. The multistore exists to support the modularity of the Cosmos SDK, as it lets each module declare and manage their own subset of the state. Key-value stores in the multistore can only be accessed with a specific capability `key`, which is typically held in the [`keeper`](../building-modules/keeper.md) of the module that declared the store. + +``` ++-----------------------------------------------------+ +| | +| +--------------------------------------------+ | +| | | | +| | KVStore 1 - Manage by keeper of Module 1 | +| | | | +| +--------------------------------------------+ | +| | +| +--------------------------------------------+ | +| | | | +| | KVStore 2 - Manage by keeper of Module 2 | | +| | | | +| +--------------------------------------------+ | +| | +| +--------------------------------------------+ | +| | | | +| | KVStore 3 - Manage by keeper of Module 2 | | +| | | | +| +--------------------------------------------+ | +| | +| +--------------------------------------------+ | +| | | | +| | KVStore 4 - Manage by keeper of Module 3 | | +| | | | +| +--------------------------------------------+ | +| | +| +--------------------------------------------+ | +| | | | +| | KVStore 5 - Manage by keeper of Module 4 | | +| | | | +| +--------------------------------------------+ | +| | +| Main Multistore | +| | ++-----------------------------------------------------+ + + Application's State +``` + +### Store Interface + +At its very core, a Cosmos SDK `store` is an object that holds a `CacheWrapper` and implements a `GetStoreType()` method: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/types/store.go#L12-L15 + +The `GetStoreType` is a simple method that returns the type of store, whereas a `CacheWrapper` is a simple interface that specifies cache-wrapping and `Write` methods: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/types/store.go#L217-L238 + +Cache-wrapping is used ubiquitously in the Cosmos SDK and required to be implemented on every store type. A cache-wrapper creates a light snapshot of a store that can be passed around and updated without affecting the main underlying store. This is used to trigger temporary state-transitions that may be reverted later should an error occur. If a state-transition sequence is performed without issue, the cached store can be comitted to the underlying store at the end of the sequence. + +### Commit Store + +A commit store is a store that has the ability to commit changes made to the underlying tree or db. The Cosmos SDK differentiates simple stores from commit stores by extending the basic store interfaces with a `Committer`: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/types/store.go#L24-L28 + +The `Committer` is an interface that defines methods to persist changes to disk: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/types/store.go#L17-L22 + +The `CommitID` is a deterministic commit of the state tree. Its hash is returned to the underlying consensus engine and stored in the block header. Note that commit store interfaces exist for various purposes, one of which is to make sure not every object can commit the store. As part of the [object-capabilities model](./ocap.md) of the Cosmos SDK, only `baseapp` should have the ability to commit stores. For example, this is the reason why the `ctx.KVStore()` method by which modules typically access stores returns a `KVStore` and not a `CommitKVStore`. + +The Cosmos SDK comes with many types of stores, the most used being [`CommitMultiStore`](#multistore), [`KVStore`](#kvstore) and [`GasKv` store](#gaskv-store). [Other types of stores](#other-stores) include `Transient` and `TraceKV` stores. + +## Multistore + +### Multistore Interface + +Each Cosmos SDK application holds a multistore at its root to persist its state. The multistore is a store of `KVStores` that follows the `Multistore` interface: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/types/store.go#L83-L112 + +If tracing is enabled, then cache-wrapping the multistore will wrap all the underlying `KVStore` in [`TraceKv.Store`](#tracekv-store) before caching them. + +### CommitMultiStore + +The main type of `Multistore` used in the Cosmos SDK is `CommitMultiStore`, which is an extension of the `Multistore` interface: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/types/store.go#L120-L158 + +As for concrete implementation, the [`rootMulti.Store`] is the go-to implementation of the `CommitMultiStore` interface. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/rootmulti/store.go#L27-L43 + +The `rootMulti.Store` is a base-layer multistore built around a `db` on top of which multiple `KVStores` can be mounted, and is the default multistore store used in [`baseapp`](./baseapp.md). + +### CacheMultiStore + +Whenever the `rootMulti.Store` needs to be cached-wrapped, a [`cachemulti.Store`](https://github.com/cosmos/cosmos-sdk/blob/master/store/cachemulti/store.go) is used. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/cachemulti/store.go#L17-L28 + +`cachemulti.Store` cache wraps all substores in its constructor and hold them in `Store.stores`. `Store.GetKVStore()` returns the store from `Store.stores`, and `Store.Write()` recursively calls `CacheWrap.Write()` on all the substores. + +## Base-layer KVStores + +### `KVStore` and `CommitKVStore` Interfaces + +A `KVStore` is a simple key-value store used to store and retrieve data. A `CommitKVStore` is a `KVStore` that also implements a `Committer`. By default, stores mounted in `baseapp`'s main `CommitMultiStore` are `CommitKVStore`s. The `KVStore` interface is primarily used to restrict modules from accessing the committer. + +Individual `KVStore`s are used by modules to manage a subset of the global state. `KVStores` can be accessed by objects that hold a specific key. This `key` should only be exposed to the [`keeper`](../building-modules/keeper.md) of the module that defines the store. + +`CommitKVStore`s are declared by proxy of their respective `key` and mounted on the application's [multistore](#multistore) in the [main application file](../basics/app-anatomy.md#core-application-file). In the same file, the `key` is also passed to the module's `keeper` that is responsible for managing the store. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/types/store.go#L163-L193 + +Apart from the traditional `Get` and `Set` methods, a `KVStore` is expected to implement an `Iterator()` method which returns an `Iterator` object. The `Iterator()` method is used to iterate over a domain of keys, typically keys that share a common prefix. Here is a common pattern of using an `Iterator` that might be found in a module's `keeper`: + +```go +store := ctx.KVStore(keeper.storeKey) +iterator := sdk.KVStorePrefixIterator(store, prefix) // proxy for store.Iterator + +defer iterator.Close() +for ; iterator.Valid(); iterator.Next() { + var object types.Object + keeper.cdc.MustUnmarshalBinaryLengthPrefixed(iterator.Value(), &object) + + if cb(object) { + break + } +} +``` + +### `IAVL` Store + +The default implementation of `KVStore` and `CommitKVStore` used in `baseapp` is the `iavl.Store`. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/iavl/store.go#L32-L47 + + `iavl` stores are based around an [IAVL Tree](https://github.com/tendermint/iavl), a self-balancing binary tree which guarantees that: + +- `Get` and `Set` operations are O(log n), where n is the number of elements in the tree. +- Iteration efficiently returns the sorted elements within the range. +- Each tree version is immutable and can be retrieved even after a commit (depending on the pruning settings). + +### `DbAdapter` Store + +`dbadapter.Store` is a adapter for `dbm.DB` making it fulfilling the `KVStore` interface. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/dbadapter/store.go#L13-L16 + +`dbadapter.Store` embeds `dbm.DB`, meaning most of the `KVStore` interface functions are implemented. The other functions (mostly miscellaneous) are manually implemented. This store is primarily used within [Transient Stores](#transient-stores) + +### `Transient` Store + +`Transient.Store` is a base-layer `KVStore` which is automatically discarded at the end of the block. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/transient/store.go#L14-L17 + +`Transient.Store` is a `dbadapter.Store` with a `dbm.NewMemDB()`. All `KVStore` methods are reused. When `Store.Commit()` is called, a new `dbadapter.Store` is assigned, discarding previous reference and making it garbage collected. + +This type of store is useful to persist information that is only relevant per-block. One example would be to store parameter changes (i.e. a bool set to `true` if a parameter changed in a block). + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/x/params/subspace/subspace.go#L24-L32 + +Transient stores are typically accessed via the [`context`](./context.md) via the `TransientStore()` method: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/context.go#L215-L218 + +## KVStore Wrappers + +### CacheKVStore + +`cachekv.Store` is a wrapper `KVStore` which provides buffered writing / cached reading functionalities over the underlying `KVStore`. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/cachekv/store.go#L26-L33 + +This is the type used whenever an IAVL Store needs to be cache-wrapped (typically when setting value that might be reverted later). + +#### `Get` + +`Store.Get()` checks `Store.cache` first in order to find if there is any cached value associated with the key. If the value exists, the function returns it. If not, the function calls `Store.parent.Get()`, sets the key-value pair to the `Store.cache`, and returns it. + +#### `Set` + +`Store.Set()` sets the key-value pair to the `Store.cache`. `cValue` has the field dirty bool which indicates whether the cached value is different from the underlying value. When `Store.Set()` cache new pair, the `cValue.dirty` is set `true` so when `Store.Write()` is called it can be written to the underlying store. + +#### `Iterator` + +`Store.Iterator()` have to traverse on both caches items and the original items. In `Store.iterator()`, two iterators are generated for each of them, and merged. `memIterator` is essentially a slice of the `KVPairs`, used for cached items. `mergeIterator` is a combination of two iterators, where traverse happens ordered on both iterators. + +### `GasKv` Store + +Cosmos SDK applications use [`gas`](../basics/gas-fees.md) to track resources usage and prevent spam. [`GasKv.Store`](https://github.com/cosmos/cosmos-sdk/blob/master/store/gaskv/store.go) is a `KVStore` wrapper that enables automatic gas consumption each time a read or write to the store is made. It is the solution of choice to track storage usage in Cosmos SDK applications. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/gaskv/store.go#L11-L17 + +When methods of the parent `KVStore` are called, `GasKv.Store` automatically consumes appropriate amount of gas depending on the `Store.gasConfig`: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/types/gas.go#L141-L150 + +By default, all `KVStores` are wrapped in `GasKv.Stores` when retrieved. This is done in the `KVStore()` method of the [`context`](./context.md): + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/context.go#L210-L213 + +In this case, the default gas configuration is used: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/types/gas.go#L152-L163 + +### `TraceKv` Store + +`tracekv.Store` is a wrapper `KVStore` which provides operation tracing functionalities over the underlying `KVStore`. It is applied automatically by the Cosmos SDK on all `KVStore` if tracing is enabled on the parent `MultiStore`. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/tracekv/store.go#L20-L43 + +When each `KVStore` methods are called, `tracekv.Store` automatically logs `traceOperation` to the `Store.writer`. `traceOperation.Metadata` is filled with `Store.context` when it is not nil. `TraceContext` is a `map[string]interface{}`. + +### `Prefix` Store + +`prefix.Store` is a wrapper `KVStore` which provides automatic key-prefixing functionalities over the underlying `KVStore`. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/store/prefix/store.go#L17-L20 + +When `Store.{Get, Set}()` is called, the store forwards the call to its parent, with the key prefixed with the `Store.prefix`. + +When `Store.Iterator()` is called, it does not simply prefix the `Store.prefix`, since it does not work as intended. In that case, some of the elements are traversed even they are not starting with the prefix. + +## Next {hide} + +Learn about [encoding](./encoding.md) {hide} \ No newline at end of file diff --git a/docs/core/transactions.md b/docs/core/transactions.md new file mode 100644 index 000000000000..d49cd853a797 --- /dev/null +++ b/docs/core/transactions.md @@ -0,0 +1,91 @@ +--- +order: 2 +synopsis: "`Transactions` are objects created by end-users to trigger state changes in the application." +--- + +# Transactions + +## Pre-requisite Readings {hide} + +* [Anatomy of an SDK Application](../basics/app-anatomy.md) {prereq} + +## Transactions + +Transactions are comprised of metadata held in [contexts](./context.md) and [messages](../building-modules/messages-and-queries.md) that trigger state changes within a module through the module's [Handler](../building-modules/handler.md). + +When users want to interact with an application and make state changes (e.g. sending coins), they create transactions. Each of a transaction's `message`s must be signed using the private key associated with the appropriate account(s), before the transaction is broadcasted to the network. A transaction must then be included in a block, validated, and approved by the network through the consensus process. To read more about the lifecycle of a transaction, click [here](../basics/tx-lifecycle.md). + +## Type Definition + +Transaction objects are SDK types that implement the `Tx` interface + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/tx_msg.go#L34-L41 + +It contains the following methods: + +* **GetMsgs:** unwraps the transaction and returns a list of its message(s) - one transaction may have one or multiple [messages](../building-modules/messages-and-queries.md#messages), which are defined by module developers. +* **ValidateBasic:** includes lightweight, [*stateless*](../basics/tx-lifecycle.md#types-of-checks) checks used by ABCI messages [`CheckTx`](./baseapp.md#checktx) and [`DeliverTx`](./baseapp.md#delivertx) to make sure transactions are not invalid. For example, the [`auth`](https://github.com/cosmos/cosmos-sdk/tree/master/x/auth) module's `StdTx` `ValidateBasic` function checks that its transactions are signed by the correct number of signers and that the fees do not exceed what the user's maximum. Note that this function is to be distinct from the `ValidateBasic` functions for *`messages`*, which perform basic validity checks on messages only. For example, when [`runTx`](./baseapp.md#runtx) is checking a transaction created from the [`auth`](https://github.com/cosmos/cosmos-sdk/tree/master/x/auth/spec) module, it first runs `ValidateBasic` on each message, then runs the `auth` module AnteHandler which calls `ValidateBasic` for the transaction itself. +* **TxEncoder:** Nodes running the consensus engine (e.g. Tendermint Core) are responsible for gossiping transactions and ordering them into blocks, but only handle them in the generic `[]byte` form. Transactions are always [marshaled](./encoding.md) (encoded) before they are relayed to nodes, which compacts them to facilitate gossiping and helps maintain the consensus engine's separation from from application logic. The Cosmos SDK allows developers to specify any deterministic encoding format for their applications; the default is Amino. +* **TxDecoder:** [ABCI](https://tendermint.com/docs/spec/abci/) calls from the consensus engine to the application, such as `CheckTx` and `DeliverTx`, are used to process transaction data to determine validity and state changes. Since transactions are passed in as `txBytes []byte`, they need to first be unmarshaled (decoded) using `TxDecoder` before any logic is applied. + +The most used implementation of the `Tx` interface is [`StdTx` from the `auth` module](https://github.com/cosmos/cosmos-sdk/blob/master/x/auth/types/stdtx.go). As a developer, using `StdTx` as your transaction format is as simple as importing the `auth` module in your application (which can be done in the [constructor of the application](../basics/app-anatomy.md#constructor-function)) + +## Transaction Process + +A transaction is created by an end-user through one of the possible [interfaces](#interfaces). In the process, two contexts and an array of [messages](#messages) are created, which are then used to [generate](#transaction-generation) the transaction itself. The actual state changes triggered by transactions are enabled by the [handlers](#handlers). The rest of the document will describe each of these components, in this order. + +### CLI and REST Interfaces + +Application developers create entrypoints to the application by creating a [command-line interface](../interfaces/cli.md) and/or [REST interface](../interfaces/rest.md), typically found in the application's `./cmd` folder. These interfaces allow users to interact with the application through command-line or through HTTP requests. + +For the [command-line interface](../building-modules/module-interfaces.md#cli), module developers create subcommands to add as children to the application top-level transaction command `TxCmd`. For [HTTP requests](../building-modules/module-interfaces.md#rest), module developers specify acceptable request types, register REST routes, and create HTTP Request Handlers. + +When users interact with the application's interfaces, they invoke the underlying modules' handlers or command functions, directly creating messages. + +### Messages + +**`Message`s** are module-specific objects that trigger state transitions within the scope of the module they belong to. Module developers define the `message`s for their module by implementing the `Msg` interface, and also define a [`Handler`](../building-modules/handler.md) to process them. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/types/tx_msg.go#L8-L29 + +`Message`s in a module are typically defined in a `msgs.go` file (though not always), and one handler with multiple functions to handle each of the module's `message`s is defined in a `handler.go` file. + +Note: module `messages` are not to be confused with [ABCI Messages](https://tendermint.com/docs/spec/abci/abci.html#messages) which define interactions between the Tendermint and application layers. + +To learn more about `message`s, click [here](../building-modules/messages-and-queries.md#messages). + +While messages contain the information for state transition logic, a transaction's other metadata and relevant information are stored in the `TxBuilder` and `CLIContext`. + +### Transaction Generation + +Transactions are first created by end-users through an `appcli tx` command through the command-line or a POST request to an HTTPS server. For details about transaction creation, click [here](../basics/tx-lifecycle.md#transaction-creation). + +[`Contexts`](https://godoc.org/context) are immutable objects that contain all the information needed to process a request. In the process of creating a transaction through the `auth` module (though it is not mandatory to create transactions this way), two contexts are created: the [`CLIContext`](../interfaces/query-lifecycle.md#clicontext) and `TxBuilder`. Both are automatically generated and do not need to be defined by application developers, but do require input from the transaction creator (e.g. using flags through the CLI). + +The `TxBuilder` contains data closely related with the processing of transactions. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/x/auth/types/txbuilder.go#L18-L31 + +- `TxEncoder` defined by the developer for this type of transaction. Used to encode messages before being processed by nodes running Tendermint. +- `Keybase` that manages the user's keys and is used to perform signing operations. +- `AccountNumber` from which this transaction originated. +- `Sequence`, the number of transactions that the user has sent out, used to prevent replay attacks. +- `Gas` option chosen by the users for how to calculate how much gas they will need to pay. A common option is "auto" which generates an automatic estimate. +- `GasAdjustment` to adjust the estimate of gas by a scalar value, used to avoid underestimating the amount of gas required. +- `SimulateAndExecute` option to simply simulate the transaction execution without broadcasting. +- `ChainID` representing which blockchain this transaction pertains to. +- `Memo` to send with the transaction. +- `Fees`, the maximum amount the user is willing to pay in fees. Alternative to specifying gas prices. +- `GasPrices`, the amount per unit of gas the user is willing to pay in fees. Alternative to specifying fees. + +The `CLIContext` is initialized using the application's `codec` and data more closely related to the user interaction with the interface, holding data such as the output to the user and the broadcast mode. Read more about `CLIContext` [here](../interfaces/query-lifecycle.md#clicontext). + +Every message in a transaction must be signed by the addresses specified by `GetSigners`. The signing process must be handled by a module, and the most widely used one is the [`auth`](https://github.com/cosmos/cosmos-sdk/tree/master/x/auth/spec) module. Signing is automatically performed when the transaction is created, unless the user choses to generate and sign separately. The `TxBuilder` (namely, the `KeyBase`) is used to perform the signing operations, and the `CLIContext` is used to broadcast transactions. + +### Handlers + +Since `message`s are module-specific types, each module needs a [`handler`](../building-modules/handler.md) to process all of its `message` types and trigger state changes within the module's scope. This design puts more responsibility on module developers, allowing application developers to reuse common functionalities without having to implement state transition logic repetitively. To read more about `handler`s, click [here](../building-modules/handler.md). + +## Next {hide} + +Learn about the [context](./context.md) {hide} \ No newline at end of file diff --git a/docs/interfaces/README.md b/docs/interfaces/README.md new file mode 100644 index 000000000000..0e23c0478ae7 --- /dev/null +++ b/docs/interfaces/README.md @@ -0,0 +1,15 @@ +--- +order: false +parent: + order: 5 +--- + +# Interfaces + +This repository contains documentation on interfaces for Cosmos SDK applications. + +1. [Introduction to Interaces](./interfaces-intro.md) +2. [Lifecycle of a Query](./query-lifecycle.md) +3. [Command-Line Interface](./cli.md) +4. [Rest Interface](./rest.md) + diff --git a/docs/interfaces/cli.md b/docs/interfaces/cli.md new file mode 100644 index 000000000000..9cc907ee7126 --- /dev/null +++ b/docs/interfaces/cli.md @@ -0,0 +1,137 @@ +--- +order: 3 +synopsis: "This document describes how to create a commmand-line interface (CLI) for an [**application**](../basics/app-anatomy.md). A separate document for implementing a CLI for an SDK [**module**](../building-modules/intro.md) can be found [here](#../building-modules/module-interfaces.md#cli)." +--- + +# Command-Line Interface + +## Pre-requisite Readings {hide} + +* [Lifecycle of a Query](./query-lifecycle.md) {prereq} + +## Command-Line Interface + +One of the main entrypoints of an application is the command-line interface. This entrypoint is created via a `main.go` file which compiles to a binary, conventionally placed in the application's `./cmd/cli` folder. The CLI for an application is typically be referred to as the name of the application suffixed with `-cli`, e.g. `appcli`. Here is where the interfaces docs lie in the directory from the [nameservice tutorial](https://cosmos.network/docs/tutorial). + +### Example Command + +There is no set way to create a CLI, but SDK modules typically use the [Cobra Library](https://github.com/spf13/cobra). Building a CLI with Cobra entails defining commands, arguments, and flags. [**Commands**](#commands) understand the actions users wish to take, such as `tx` for creating a transaction and `query` for querying the application. Each command can also have nested subcommands, necessary for naming the specific transaction type. Users also supply **Arguments**, such as account numbers to send coins to, and [**Flags**](#flags) to modify various aspects of the commands, such as gas prices or which node to broadcast to. + +Here is an example of a command a user might enter to interact with the nameservice CLI `nscli` in order to buy a name: + +```bash +nscli tx nameservice buy-name --gas auto --gas-prices +``` + +The first four strings specify the command: + +- The root command for the entire application `nscli`. +- The subcommand `tx`, which contains all commands that let users create transactions. +- The subcommand `nameservice` to indicate which module to route the command to (`nameservice` module in this case). +- The type of transaction `buy-name`. + +The next two strings are arguments: the `name` the user wishes to buy and the `amount` they want to pay for it. Finally, the last few strings of the command are flags to indicate how much the user is willing to pay in fees (calculated using the amount of gas used to execute the transaction and the gas prices provided by the user). + +The CLI interacts with a [node](../core/node.md) (running `nsd`) to handle this command. The interface itself is defined in a `main.go` file. + +### Building the CLI + +The `main.go` file needs to have a `main()` function that does the following to run the command-line interface: + +* **Instantiate the `codec`** by calling the application's `MakeCodec()` function. The [`codec`](../core/encoding.md) is used to code and encode data structures for the application - stores can only persist `[]byte`s so the developer must define a serialization format for their data structures or use the default, [Amino](../core/encoding.md#amino). +* **Configurations** are set by reading in configuration files (e.g. the sdk config file). +* **Create the root command** to which all the application commands will be added as subcommands and add any required flags to it, such as `--chain-id`. +* **Add subcommands** for all the possible user interactions, including [transaction commands](#transaction-commands) and [query commands](#query-commands). +* **Create an Executor** and [execute](https://godoc.org/github.com/spf13/cobra#Command.Execute) the root command. + +See an example of `main()` function from the `nameservice` application: + ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/cmd/nscli/main.go#L23-L66 + +The rest of the document will detail what needs to be implemented for each step and include smaller portions of code from the nameservice CLI `main.go` file. + +## Adding Commands to the CLI + +Every application CLI first constructs a root command, then adds functionality by aggregating subcommands (often with further nested subcommands) using `rootCmd.AddCommand()`. The bulk of an application's unique capabilities lies in its transaction and query commands, called `TxCmd` and `QueryCmd` respectively. + +### Root Command + +The root command (called `rootCmd`) is what the user first types into the command line to indicate which application they wish to interact with. The string used to invoke the command (the "Use" field) is typically the name of the application suffixed with `-cli`, e.g. `appcli`. The root command typically includes the following commands to support basic functionality in the application. + +* **Status** command from the SDK rpc client tools, which prints information about the status of the connected [`Node`](../core/node.md). The Status of a node includes `NodeInfo`,`SyncInfo` and `ValidatorInfo`. +* **Config** [command](https://github.com/cosmos/cosmos-sdk/blob/master/client/config.go) from the SDK client tools, which allows the user to edit a `config.toml` file that sets values for [flags](#flags) such as `--chain-id` and which `--node` they wish to connect to. +The `config` command can be invoked by typing `appcli config` with optional arguments ` [value]` and a `--get` flag to query configurations or `--home` flag to create a new configuration. +* **Keys** [commands](https://github.com/cosmos/cosmos-sdk/blob/master/client/keys) from the SDK client tools, which includes a collection of subcommands for using the key functions in the SDK crypto tools, including adding a new key and saving it to disk, listing all public keys stored in the key manager, and deleting a key. +For example, users can type `appcli keys add ` to add a new key and save an encrypted copy to disk, using the flag `--recover` to recover a private key from a seed phrase or the flag `--multisig` to group multiple keys together to create a multisig key. For full details on the `add` key command, see the code [here](https://github.com/cosmos/cosmos-sdk/blob/master/client/keys/add.go). +* [**Transaction**](#transaction-commands) commands. +* [**Query**](#query-commands) commands. + +Next is an example `main()` function from the `nameservice` application. It instantiates the root command, adds a [*persistent* flag](#flags) and `PreRun` function to be run before every execution, and adds all of the necessary subcommands. + ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/cmd/nscli/main.go#L23-L66 + +The root-level `status`, `config`, and `keys` subcommands are common across most applications and do not interact with application state. The bulk of an application's functionality - what users can actually *do* with it - is enabled by its transaction commands. + +### Transaction Commands + +[Transactions](#./transactions.md) are objects wrapping [messages](../building-modules/messages-and-queries.md#messages) that trigger state changes. To enable the creation of transactions using the CLI interface, a function `txCmd` is generally added to the `rootCmd`: + ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/cmd/nscli/main.go#L51 + +This `txCmd` function adds all the transaction available to end-users for the application. This typically includes: + +* **Sign command** from the [`auth`](https://github.com/cosmos/cosmos-sdk/tree/master/x/auth/spec) module that signs messages in a transaction. To enable multisig, add the `auth` module's `MultiSign` command. Since every transaction requires some sort of signature in order to be valid, thithe signing command is necessary for every application. +* **Broadcast command** from the SDK client tools, to broadcast transactions. +* **Send command** from the [`bank`](https://github.com/cosmos/cosmos-sdk/tree/master/x/bank/spec) module, which is a transaction that allows accounts to send coins to one another, including gas and fees for transactions. +* **All [module transaction commands](../building-modules/module-interfaces.md#transaction-commands)** the application is dependent on, retrieved by using the [basic module manager's](../building-modules/module-manager.md#basic-manager) `AddTxCommands()` function. + +Here is an example of a `txCmd` aggregating these subcommands from the `nameservice` application: + ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/cmd/nscli/main.go#L97-L118 + + +### Query Commands + +[**Queries**](../building-modules/messages-and-queries.md#queries) are objects that allow users to retrieve information about the application's state. To enable the creation of transactions using the CLI interface, a function `txCmd` is generally added to the `rootCmd`: + ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/cmd/nscli/main.go#L50 + +This `queryCmd` function adds all the queries available to end-users for the application. This typically includes: + +* **QueryTx** and/or other transaction query commands] from the `auth` module which allow the user to search for a transaction by inputting its hash, a list of tags, or a block height. These queries allow users to see if transactions have been included in a block. +* **Account command** from the `auth` module, which displays the state (e.g. account balance) of an account given an address. +* **Validator command** from the SDK rpc client tools, which displays the validator set of a given height. +* **Block command** from the SDK rpc client tools, which displays the block data for a given height. +* **All [module query commands](../building-modules/module-interfaces.md#query-commands)** the application is dependent on, retrieved by using the [basic module manager's](../building-modules/module-manager.md#basic-manager) `AddQueryCommands()` function. + +Here is an example of a `queryCmd` aggregating subcommands from the `nameservice` application: + ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/cmd/nscli/main.go#L74-L95 + +## Flags + +Flags are used to modify commands; developers can include them in a `flags.go` file with their CLI. Users can explicitly include them in commands or pre-configure them by entering a command in the format `appcli config ` into their command line. Commonly pre-configured flags include the `--node` to connect to and `--chain-id` of the blockchain the user wishes to interact with. + +A *persistent* flag (as opposed to a _local_ flag) added to a command transcends all of its children: subcommands will inherit the configured values for these flags. Additionally, all flags have default values when they are added to commands; some toggle an option off but others are empty values that the user needs to override to create valid commands. A flag can be explicitly marked as _required_ so that an error is automatically thrown if the user does not provide a value, but it is also acceptable to handle unexpected missing flags differently. + +Flags are added to commands directly (generally in the [module's CLI file](../building-modules/module-interfaces.md#flags) where module commands are defined) and no flag except for the `rootCmd` persistent flags has to be added at application level. It is common to add a _persistent_ flag for `--chain-id`, the unique identifier of the blockchain the application pertains to, to the root command. Adding this flag can be done in the `main()` function. Adding this flag makes sense as the chain ID should not be changing across commands in this application CLI. Here is an example from the `nameservice` application: + ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/cmd/nscli/main.go#L41 + + +## Configurations + +The last function to define in `main.go` is `initConfig`, which does exactly what it sounds like - initialize configurations. To call this function, set it as a `PersistentPreRunE` function for the root command, so that it always executes before the main execution of the root command and any of its subcommands. `initConfig()` does the following: + +1. Read in the `config.toml` file. This same file is edited through `config` commands. +2. Use the [Viper](https://github.com/spf13/viper) to read in configurations from the file and set them. +3. Set any persistent flags defined by the user: `--chain-id`, `--encoding`, `--output`, etc. + +Here is an example of an `initConfig()` function from the [nameservice tutorial CLI](https://cosmos.network/docs/tutorial/entrypoint.html#nscli): + ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/cmd/nscli/main.go#L120-L141 + +And an example of how to add `initConfig` as a `PersistentPreRunE` to the root command: + ++++ https://github.com/cosmos/sdk-tutorials/blob/86a27321cf89cc637581762e953d0c07f8c78ece/nameservice/cmd/nscli/main.go#L42-L44 + diff --git a/docs/interfaces/clients.md b/docs/interfaces/clients.md deleted file mode 100644 index ee972577c121..000000000000 --- a/docs/interfaces/clients.md +++ /dev/null @@ -1,26 +0,0 @@ -# Clients - -This section explains contains information on clients for SDK based blockchain. - ->*NOTE*: This section is a WIP. - -## Light-client - -Light-clients enable users to interact with your application without having to download the entire state history but with a good level of security. - -- [Overview of light clients](./lite/README.md) -- [Starting a light-client server](./lite/getting_started.md) -- [Light-client specification](./lite/specification.md) - -## Other clients - -- [Command-Line interface for SDK-based blockchain](./cli.md) -- [Service provider doc](./service-providers.md) - -## Genesis upgrade - -If you need to upgrade your node you could export the genesis and migrate it to the new version through this script: - -```bash - migrate v0.36 genesis_0_34.json [--time "2019-04-22T17:00:11Z"] [--chain-id test] > ~/.gaiad/genesis.json -``` diff --git a/docs/interfaces/interfaces-intro.md b/docs/interfaces/interfaces-intro.md new file mode 100644 index 000000000000..eb807d0025e8 --- /dev/null +++ b/docs/interfaces/interfaces-intro.md @@ -0,0 +1,43 @@ +--- +order: 1 +synopsis: Typically, SDK applications include interfaces to let end-users interact with the application. This document introduces the different types of interfaces for SDK applications. +--- + +# Interfaces + +## Pre-requisite Readings {hide} + +* [Anatomy of an SDK Application](../basics/app-anatomy.md) {prereq} +* [Lifecycle of a Transaction](../basics/tx-lifecycle.md) {prereq} + +## Types of Application Interfaces + +SDK applications generally have a Command-Line Interface (CLI) and REST Interface to support interactions with a [full-node](../core/node.md). The SDK is opinionated about how to create these two interfaces; all modules specify [Cobra commands](https://github.com/spf13/cobra) and register routes using [Gorilla Mux routers](https://github.com/gorilla/mux). The CLI and REST Interface are conventionally defined in the application `./app/cmd/cli` folder. + +## Module vs Application Interfaces + +The process of creating an application interface is distinct from creating a [module interface](../building-modules/module-interfaces.md), though the two are closely intertwined. As expected, module interfaces handle the bulk of the underlying logic, defining ways for end-users to create [messages](../building-modules/messages-and-queries.md#messages) and [queries](../building-modules/messages-and-queries.md#queries) to the subset of application state within their scope. On the other hand, application interfaces aggregate module-level interfaces in order to route `messages` and `queries` to the appropriate modules. Application interfaces also handle root-level responsibilities such as signing and broadcasting [transactions](../core/transactions.md) that wrap messages. + +### Module Developer Responsibilities + +With regards to interfaces, module developers need to include the following definitions: + +* **CLI commands:** Specifically, [Transaction commands](../building-modules/module-interfaces.md#transaction-commands) and [Query commands](../building-modules/module-interfaces.md#query-commands). These are commands that users will invoke when interacting with the application to create transactions and queries. For example, if an application enables sending coins through the [`auth`](https://github.com/cosmos/cosmos-sdk/tree/master/x/auth/spec) module, users will create `tx auth send` transactions. +* **Request Handlers:** Also categorized into Transaction and Query requests. Transactions will require HTTP [Request Types](../building-modules/module-interfaces.md#request-types) in addition to [Request Handlers](../building-modules/module-interfaces.md#request-handlers) in order to encapsulate all of the user's options (e.g. gas prices). +* **REST Routes:** Given a router, the module interface registers paths with the aforementioned [Request Handlers](../building-modules/module-interfaces.md#request-handlers) for each type of request. + +Module interfaces are designed to be generic. Both commands and request types include required user input (through flags or request body) which are different for each application. This section of documents will only detail application interfaces; to read about how to build module interfaces, click [here](../building-modules/module-interfaces.md). + +### Application Developer Responsibilities + +With regards to interfaces, application developers need to include: + +* **CLI Root Command:** The [root command](./cli.md#root-command) adds subcommands to include all of the functionality for the application, mainly module [transaction](./cli.md#transaction-commands) and [query](./cli.md#query-commands) commands from the application's module(s). +* **App Configurations:** All application-specific values are the responsibility of the application developer, including the [`codec`](../core/encoding.md) used to marshal requests before relaying them to a node. +* **User Configurations:** Some values are specific to the user, such as the user's address and which node they are connected to. The CLI has a [configurations](./cli.md#configurations) function to set these values. +* **RegisterRoutes Function:** [Routes](./rest.md#registerroutes) must be registered and passed to an instantiated [REST server](./rest.md#rest-server) so that it knows how to route requests for this particular application. + + +## Next {hide} + +Read about the [Lifecycle of a Query](./query-lifecycle.md) {hide} diff --git a/docs/interfaces/lite/readme.md b/docs/interfaces/lite/readme.md index 23bcb2f93b26..e31ccd0752e5 100644 --- a/docs/interfaces/lite/readme.md +++ b/docs/interfaces/lite/readme.md @@ -1,3 +1,8 @@ +--- +parent: + order: false +--- + # Light Client Overview **See the Cosmos SDK Light Client RPC documentation [here](https://cosmos.network/rpc/)** diff --git a/docs/interfaces/lite/specification.md b/docs/interfaces/lite/specification.md index e252403731a2..4ce849acaa1d 100644 --- a/docs/interfaces/lite/specification.md +++ b/docs/interfaces/lite/specification.md @@ -14,7 +14,7 @@ tree is the AppHash which will be included in block header. ![Simple Merkle Tree](./pics/simpleMerkleTree.png) -As we have discussed in [LCD trust-propagation](https://github.com/irisnet/cosmos-sdk/tree/bianjie/lcd_spec/docs/spec/lcd#trust-propagation), +As we have discussed in LCD trust-propagation, the AppHash can be verified by checking voting power against a trusted validator set. Here we just need to build proof from ABCI state to AppHash. The proof contains two parts: diff --git a/docs/interfaces/query-lifecycle.md b/docs/interfaces/query-lifecycle.md new file mode 100644 index 000000000000..748ebb8225dc --- /dev/null +++ b/docs/interfaces/query-lifecycle.md @@ -0,0 +1,161 @@ +--- +order: 2 +synopsis: "This document describes the lifecycle of a query in a SDK application, from the user interface to application stores and back. The query will be referred to as `Query`." +--- + +# Query Lifecycle + +## Pre-requisite Readings {hide} + +* [Introduction to Interfaces](./interfaces-intro.md) {prereq} + +## Query Creation + +A [**query**](../building-modules/messages-and-queries.md#queries) is a request for information made by end-users of applications through an interface and processed by a full-node. Users can query information about the network, the application itself, and application state directly from the application's stores or modules. Note that queries are different from [transactions](../core/transactions.md) (view the lifecycle [here](../basics/tx-lifecycle.md)), particularly in that they do not require consensus to be processed (as they do not trigger state-transitions); they can be fully handled by one full-node. + +For the purpose of explaining the query lifecycle, let's say `Query` is requesting a list of delegations made by a certain delegator address in the application called `app`. As to be expected, the [`staking`](https://github.com/cosmos/cosmos-sdk/tree/master/x/staking/spec) module handles this query. But first, there are a few ways `Query` can be created by users. + +### CLI + +The main interface for an application is the command-line interface. Users connect to a full-node and run the CLI directly from their machines - the CLI interacts directly with the full-node. To create `Query` from their terminal, users type the following command: + +```bash +appcli query staking delegations +``` + +This query command was defined by the [`staking`](https://github.com/cosmos/cosmos-sdk/tree/master/x/staking/spec) module developer and added to the list of subcommands by the application developer when creating the CLI. The code for this particular command is the following: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/x/staking/client/cli/query.go#L250-L293 + +Note that the general format is as follows: + +```bash +appcli query [moduleName] [command] --flag +``` + +To provide values such as `--node` (the full-node the CLI connects to), the user can use the `config` command to set themn or provide them as flags. + +The CLI understands a specific set of commands, defined in a hierarchical structure by the application developer: from the [root command](./cli.md#root-command) (`appcli`), the type of command (`query`), the module that contains the command (`staking`), and command itself (`delegations`). Thus, the CLI knows exactly which module handles this command and directly passes the call there. + +### REST + +Another interface through which users can make queries is through HTTP Requests to a [REST server](./rest.md#rest-server). The REST server contains, among other things, a [`CLIContext`](#clicontext) and [mux](./rest.md#gorilla-mux) router. The request looks like this: + +```bash +GET http://localhost:{PORT}/staking/delegators/{delegatorAddr}/delegations +``` + +To provide values such as `--node` (the full-node the CLI connects to) that are required by [`baseReq`](../building-modules/module-interfaces.md#basereq), the user must configure their local REST server with the values or provide them in the request body. + +The router automatically routes the `Query` HTTP request to the staking module `delegatorDelegationsHandlerFn()` function. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/x/staking/client/rest/query.go#L103-L106 + +Since this function is defined within the module and thus has no inherent knowledge of the application `Query` belongs to, it takes in the application `codec` and `CLIContext` as parameters. + +To summarize, when users interact with the interfaces, they create a CLI command or HTTP request. `Query` now exists in one of these two forms, but needs to be transformed into an object understood by a full-node. + +## Query Preparation + +The interactions from the users' perspective are a bit different, but the underlying functions are almost identical because they are implementations of the same command defined by the module developer. This step of processing happens within the CLI or REST server and heavily involves a `CLIContext`. + +### CLIContext + +The first thing that is created in the execution of a CLI command is a `CLIContext`, while the REST Server directly provides a `CLIContext` for the REST Request handler. A [Context](../core/context.md) is an immutable object that stores all the data needed to process a request on the user side. In particular, a `CLIContext` stores the following: + +* **Codec**: The [encoder/decoder](../core/encoding.md) used by the application, used to marshal the parameters and query before making the Tendermint RPC request and unmarshal the returned response into a JSON object. +* **Account Decoder**: The account decoder from the [`auth`](https://github.com/cosmos/cosmos-sdk/tree/master/x/auth/spec) module, which translates `[]byte`s into accounts. +* **RPC Client**: The Tendermint RPC Client, or node, to which the request will be relayed to. +* **Keybase**: A [Key Manager](../basics/accounts.md#keybase) used to sign transactions and handle other operations with keys. +* **Output Writer**: A [Writer](https://golang.org/pkg/io/#Writer) used to output the response. +* **Configurations**: The flags configured by the user for this command, including `--height`, specifying the height of the blockchain to query and `--indent`, which indicates to add an indent to the JSON response. + +The `CLIContext` also contains various functions such as `Query()` which retrieves the RPC Client and makes an ABCI call to relay a query to a full-node. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/client/context/context.go#L23-L47 + +The `CLIContext`'s primary role is to store data used during interactions with the end-user and provide methods to interact with this data - it is used before and after the query is processed by the full-node. Specifically, in handling `Query`, the `CLIContext` is utilized to encode the query parameters, retrieve the full-node, and write the output. Prior to being relayed to a full-node, the query needs to be encoded into a `[]byte` form, as full-nodes are application-agnostic and do not understand specific types. The full-node (RPC Client) itself is retrieved using the `CLIContext`, which knows which node the user CLI is connected to. The query is relayed to this full-node to be processed. Finally, the `CLIContext` contains a `Writer` to write output when the response is returned. These steps are further described in later sections. + +### Arguments and Route Creation + +At this point in the lifecycle, the user has created a CLI command or HTTP Request with all of the data they wish to include in their `Query`. A `CLIContext` exists to assist in the rest of the `Query`'s journey. Now, the next step is to parse the command or request, extract the arguments, create a `queryRoute`, and encode everything. These steps all happen on the user side within the interface they are interacting with. + +#### Encoding + +In this case, `Query` contains an [address](../basics/accounts.md#addresses) `delegatorAddress` as its only argument. However, the request can only contain `[]byte`s, as it will be relayed to a consensus engine (e.g. Tendermint Core) of a full-node that has no inherent knowledge of the application types. Thus, the `codec` of `CLIContext` is used to marshal the address. + +Here is what the code looks like for the CLI command: + +```go +delAddr, err := sdk.AccAddressFromBech32(args[0]) +bz, err := cdc.MarshalJSON(types.NewQueryDelegatorParams(delAddr)) +``` + +Here is what the code looks like for the HTTP Request: + +```go +vars := mux.Vars(r) +bech32delegator := vars["delegatorAddr"] +delegatorAddr, err := sdk.AccAddressFromBech32(bech32delegator) +cliCtx, ok := rest.ParseQueryHeightOrReturnBadRequest(w, cliCtx, r) +if !ok { + return +} +params := types.NewQueryDelegatorParams(delegatorAddr) +``` + +#### Query Route Creation + +Important to note is that there will never be a "query" object created for `Query`; the SDK actually takes a simpler approach. Instead of an object, all the full-node needs to process a query is its `route` which specifies exactly which module to route the query to and the name of this query type. The `route` will be passed to the application `baseapp`, then module, then [querier](../building-modules/querier.md), and each will understand the `route` and pass it to the appropriate next step. [`baseapp`](../core/baseapp.md#query-routing) will understand this query to be a `custom` query in the module `staking`, and the `staking` module querier supports the type `QueryDelegatorDelegations`. Thus, the route will be `"custom/staking/delegatorDelegations"`. + +Here is what the code looks like: + +```go +route := fmt.Sprintf("custom/%s/%s", queryRoute, types.QueryDelegatorDelegations) +``` + +Now, `Query` exists as a set of encoded arguments and a route to a specific module and its query type. It is ready to be relayed to a full-node. + +#### ABCI Query Call + +The `CLIContext` has a `Query()` function used to retrieve the pre-configured node and relay a query to it; the function takes the query `route` and arguments as parameters. It first retrieves the RPC Client (called the [**node**](../core/node.md)) configured by the user to relay this query to, and creates the `ABCIQueryOptions` (parameters formatted for the ABCI call). The node is then used to make the ABCI call, `ABCIQueryWithOptions()`. + +Here is what the code looks like: + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/client/context/query.go#L75-L112 + +## RPC + +With a call to `ABCIQueryWithOptions()`, `Query` is received by a [full-node](../core/encoding.md) which will then process the request. Note that, while the RPC is made to the consensus engine (e.g. Tendermint Core) of a full-node, queries are not part of consensus and will not be broadcasted to the rest of the network, as they do not require anything the network needs to agree upon. + +Read more about ABCI Clients and Tendermint RPC in the Tendermint documentation [here](https://tendermint.com/rpc). + +## Application Query Handling + +When a query is received by the full-node after it has been relayed from the underlying consensus engine, it is now being handled within an environment that understands application-specific types and has a copy of the state. [`baseapp`](../core/baseapp.md) implements the ABCI [`Query()`](../core/baseapp.md#query) function and handles four different types of queries: `app`, `store`, `p2p`, and `custom`. The `queryRoute` is parsed such that the first string must be one of the four options, then the rest of the path is parsed within the subroutines handling each type of query. The first three types (`app`, `store`, `p2p`) are purely application-level and thus directly handled by `baseapp` or the stores, but the `custom` query type requires `baseapp` to route the query to a module's [querier](../building-modules/querier.md). + +Since `Query` is a custom query type from the `staking` module, `baseapp` first parses the path, then uses the `QueryRouter` to retrieve the corresponding querier, and routes the query to the module. The querier is responsible for recognizing this query, retrieving the appropriate values from the application's stores, and returning a response. Read more about queriers [here](../building-modules/querier.md). + +Once a result is received from the querier, `baseapp` begins the process of returning a response to the user. + +## Response + +Since `Query()` is an ABCI function, `baseapp` returns the response as an [`abci.ResponseQuery`](https://tendermint.com/docs/spec/abci/abci.html#messages) type. The `CLIContext` `Query()` routine receives the response and, if `--trust-node` is toggled to `false` and a proof needs to be verified, the response is verified with the `CLIContext` `verifyProof()` function before the response is returned. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/client/context/query.go#L127-L165 + +### CLI Response + +The application [`codec`](../core/encoding.md) is used to unmarshal the response to a JSON and the `CLIContext` prints the output to the command line, applying any configurations such as `--indent`. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/x/staking/client/cli/query.go#L252-L293 + +### REST Response + +The [REST server](./rest.md#rest-server) uses the `CLIContext` to format the response properly, then uses the HTTP package to write the appropriate response or error. + ++++ https://github.com/cosmos/cosmos-sdk/blob/7d7821b9af132b0f6131640195326aa02b6751db/x/staking/client/rest/utils.go#L115-L148 + +## Next {hide} + +Read about how to build a [Command-Line Interface](./cli.md), or a [REST Interface](./rest.md) {hide} diff --git a/docs/interfaces/rest.md b/docs/interfaces/rest.md new file mode 100644 index 000000000000..ceb2ce63999e --- /dev/null +++ b/docs/interfaces/rest.md @@ -0,0 +1,60 @@ +--- +order: 4 +synopsis: "This document describes how to create a REST interface for an SDK **application**. A separate document for creating a [**module**](../building-modules/intro.md) REST interface can be found [here](#../module-interfaces.md#rest)." +--- + +# REST Interface + +## Prerequisites {hide} + +* [Query Lifecycle](./query-lifecycle.md) {prereq} +* [Application CLI](./cli.md) {prereq} + +## Application REST Interface + +Building the REST Interface for an application is done by [aggregating REST Routes](#registering-routes) defined in the application's modules. This interface is served by a REST Server [REST server](#rest-server), which route requests and output responses in the application itself. The SDK comes with its own REST Server by default. To enable it, the `rest.ServeCommand` command needs to be added as a subcommand of the `rootCmd` in the `main()` function of the [CLI interface](./cli.md): + +```go +rootCmd.AddCommand(rest.ServeCommand(cdc, registerRoutes)) +``` + +Users will then be able to use the application CLI to start a new REST server, a local server through which they can securely interact with the application without downloading the entire state. The command entered by users would look something like this: + +```bash +appcli rest-server --chain-id --trust-node +``` + +Note that if `trust-node` is set to `false`, the REST server will verify the query proof against the merkle root (contained in the block header). + +## REST Server + +A REST Server is used to receive and route HTTP Requests, obtain the results from the application, and return a response to the user. The REST Server defined by the SDK `rest` package contains the following: + +* **Router:** A router for HTTP requests. A new router can be instantiated for an application and used to match routes based on path, request method, headers, etc. The SDK uses the [Gorilla Mux Router](https://github.com/gorilla/mux). +* **CLIContext:** A [`CLIContext`](./query-lifecycle.md#clicontext) created for a user interaction. +* **Keybase:** A [Keybase](../basics/accounts.md#keybase) is a key manager. +* **Logger:** A logger from Tendermint `Log`, a log package structured around key-value pairs that allows logging level to be set differently for different keys. The logger takes `Debug()`, `Info()`, and `Error()`s. +* **Listener:** A [listener](https://golang.org/pkg/net/#Listener) from the net package. + +Of the five, the only attribute that application developers need interact with is the `router`: they need to add routes to it so that the REST server can properly handle queries. See the next section for more information on registering routes. + +In order to enable the REST Server in an SDK application, the `rest.ServeCommand` needs to be added to the application's command-line interface. See the [above section](#application-rest-interface) for more information. + +## Registering Routes + +To include routes for each module in an application, the CLI must have some kind of function to register routes in its REST Server. This function is called `RegisterRoutes()`, and is utilized by the `ServeCommand` and must include routes for each of the application's modules. Since each module used by an SDK application implements a [`RegisterRESTRoutes`](../building-modules/module-interfaces.md#rest) function, application developers simply use the [Module Manager](../building-modules/module-manager.md) to call this function for each module (this is done in the [application's constructor](../basics/app-anatomy.md#constructor-function)). + +At the bare minimum, a `RegisterRoutes()` function should use the SDK client package `RegisterRoutes()` function to be able to route RPC calls, and instruct the application Module Manager to call `RegisterRESTRoutes()` for all of its modules. This is done in the `main.go` file of the CLI (typically located in `./cmd/appcli/main.go`). + +```go +func registerRoutes(rs *rest.RestServer) { + client.RegisterRoutes(rs.CliCtx, rs.Mux) + app.ModuleBasics.RegisterRESTRoutes(rs.CliCtx, rs.Mux) +} +``` + +This function is specific to the application and passed in to the `ServeCommand`, which should be added to the `rootCmd` as such: + +```go +rootCmd.AddCommand(rest.ServeCommand(cdc, registerRoutes)) +``` diff --git a/docs/interfaces/service-providers.md b/docs/interfaces/service-providers.md deleted file mode 100644 index ad8019930dba..000000000000 --- a/docs/interfaces/service-providers.md +++ /dev/null @@ -1,196 +0,0 @@ -# Service Providers - -We define 'service providers' as entities providing services for end-users that involve some form of interaction with a Cosmos-SDK based blockchain (this includes the Cosmos Hub). More specifically, this document will be focused around interactions with tokens. - -This section does not concern wallet builders that want to provide [Light-Client](https://github.com/cosmos/cosmos-sdk/tree/master/docs/interfaces/lite) functionalities. Service providers are expected to act as trusted point of contact to the blockchain for their end-users. - -## High-level description of the architecture - -There are three main pieces to consider: - -- Full-nodes: To interact with the blockchain. -- Rest Server: This acts as a relayer for HTTP calls. -- Rest API: Define available endpoints for the Rest Server. - -## Running a Full-Node - -### Installation and configuration - -We will describe the steps to run and interact with a full-node for the Cosmos Hub. For other SDK-based blockchain, the process should be similar. - -First, you need to [install the software](../cosmos-hub/installation.md). - -Then, you can start [running a full-node](../cosmos-hub/join-testnet.md). - -### Command-Line interface - -Next you will find a few useful CLI commands to interact with the Full-Node. - -#### Creating a key-pair - -To generate a new key (default secp256k1 elliptic curve): - -```bash -gaiacli keys add -``` - -The key-pair will be created in your system's password store. This will return the information listed below: - -- `NAME`: Name of your key -- `TYPE`: Type of your key, always `local`. -- `ADDRESS`: Your address. Used to receive funds. -- `PUBKEY`: Your public key. Useful for validators. -- `MNEMONIC`: 24-words phrase. **Save this mnemonic somewhere safe**. It is used to recover your -private key in case you forget the password to unlock your system's credentials store. - -You can see all your available keys by typing: - -```bash -gaiacli keys list -``` - -#### Checking your balance - -After receiving tokens to your address, you can view your account's balance by typing: - -```bash -gaiacli account -``` - -*Note: When you query an account balance with zero tokens, you will get this error: No account with address was found in the state. This is expected! We're working on improving our error messages.* - -#### Sending coins via the CLI - -Here is the command to send coins via the CLI: - -```bash -gaiacli tx send \ - --chain-id= -``` - -Parameters: - -- ``: Key name or address of sending account. -- ``: Address of the recipient. -- ``: This parameter accepts the format ``, such as `10faucetToken`. - -Flags: - -- `--chain-id`: This flag allows you to specify the id of the chain. There will be different ids for different testnet chains and main chain. - -#### Help - -If you need to do something else, the best command you can run is: - -```bash -gaiacli -``` - -It will display all the available commands. For each command, you can use the `--help` flag to get further information. - -## Setting up the Rest Server - -The Rest Server acts as an intermediary between the front-end and the full-node. You don't need to run the Rest Server on the same machine as the full-node. - -To start the Rest server: - -```bash -gaiacli rest-server --node= -``` - -Flags: -- `--trust-node`: A boolean. If `true`, light-client verification is disabled. If `false`, it is disabled. For service providers, this should be set to `true`. By default, it set to `true`. -- `--node`: This is where you indicate the address and the port of your full-node. The format is ``. If the full-node is on the same machine, the address should be `tcp://localhost:26657`. -- `--laddr`: This flag allows you to specify the address and port for the Rest Server (default `1317`). You will mostly use this flag only to specify the port, in which case just input "localhost" for the address. The format is . - - -### Listening for incoming transaction - -The recommended way to listen for incoming transaction is to periodically query the blockchain through the following endpoint of the LCD: - -[`/bank/balance/{address}`](https://cosmos.network/rpc/#/ICS20/get_bank_balances__address_) - -## Rest API - -The Rest API documents all the available endpoints that you can use to interact -with your full node. It can be found [here](https://cosmos.network/rpc/). - -The API is divided into ICS standards for each category of endpoints. For -example, the [ICS20](https://cosmos.network/rpc/#/ICS20/) describes the API to -interact with tokens. - -To give more flexibility to developers, we have included the ability to -generate unsigned transactions, [sign](https://cosmos.network/rpc/#/ICS20/post_tx_sign) -and [broadcast](https://cosmos.network/rpc/#/ICS20/post_tx_broadcast) them with -different API endpoints. This allows service providers to use their own signing -mechanism for instance. - -In order to generate an unsigned transaction (example with -[coin transfer](https://cosmos.network/rpc/#/ICS20/post_bank_accounts__address__transfers)), -you need to use the field `generate_only` in the body of `base_req`. - -## Cosmos SDK Transaction Signing - -Cosmos SDK transaction signing is a fairly simple process. - -Every Cosmos SDK transaction has a canonical JSON representation. The `gaiacli` -and Stargate REST interfaces provide canonical JSON representations of transactions -and their "broadcast" functions will provide compact Amino (a protobuf-like wire format) -encoding translations. - -Things to know when signing messages: - -The format is as follows - -```json -{ - "account_number": XXX, - "chain_id": XXX, - "fee": XXX, - "sequence": XXX, - "memo": XXX, - "msgs": XXX -} -``` - -The signer must supply `"chain_id"`, `"account number"` and `"sequence number"`. - -The `"fee"`, `"msgs"` and `"memo"` fields will be supplied by the transaction -composer interface. - -The `"account_number"` and `"sequence"` fields can be queried directly from the -blockchain or cached locally. Getting these numbers wrong, along with the chainID, -is a common cause of invalid signature error. You can load the mempool of a full -node or validator with a sequence of uncommitted transactions with incrementing -sequence numbers and it will mostly do the correct thing. - -Before signing, all keys are lexicographically sorted and all white space is -removed from the JSON output. - -The signature encoding is the 64-byte concatenation of ECDSArands (i.e. `r || s`), -where `s` is lexicographically less than its inverse in order to prevent malleability. -This is like Ethereum, but without the extra byte for PubKey recovery, since -Tendermint assumes the PubKey is always provided anyway. - -Signatures and public key examples in a signed transaction: - -``` json -{ - "type": "cosmos-sdk/StdTx", - "value": { - "msg": [...], - "signatures": [ - { - "pub_key": { - "type": "tendermint/PubKeySecp256k1", - "value": XXX - }, - "signature": XXX - } - ], - } -} -``` - -Once signatures are properly generated, insert the JSON into into the generated -transaction and then use the broadcast endpoint. diff --git a/docs/intro/README.md b/docs/intro/README.md new file mode 100644 index 000000000000..22ade6bf00a7 --- /dev/null +++ b/docs/intro/README.md @@ -0,0 +1,16 @@ +--- +order: false +parent: + order: 1 +--- + +# Introduction + +This folder contains introduction material on the Cosmos SDK. + +1. [Overview](./overview.md) +2. [Application-Specific Blockchains](./why-app-specific.md) +3. [Architecture of an SDK Application](./sdk-app-architecture.md) +4. [Cosmos SDK Design Overview](./sdk-design.md) + +After reading the introduction material, head over to the [basics](../basics/README.md) to learn more. \ No newline at end of file diff --git a/docs/intro/intro.md b/docs/intro/overview.md similarity index 69% rename from docs/intro/intro.md rename to docs/intro/overview.md index 1b1a6ff7ddd6..94e6d3d6df40 100644 --- a/docs/intro/intro.md +++ b/docs/intro/overview.md @@ -2,13 +2,13 @@ order: 1 --- -# SDK Intro +# High-level Overview ## What is the SDK? -The [Cosmos-SDK](https://github.com/cosmos/cosmos-sdk) is an open-source framework for building multi-asset public Proof-of-Stake (PoS) blockchains, like the Cosmos Hub, as well as permissioned Proof-Of-Authority (PoA) blockchains. Blockchains built with the Cosmos SDK are generally referred to as **application-specific blockchains**. +The [Cosmos-SDK](https://github.com/cosmos/cosmos-sdk) is an open-source framework for building multi-asset public Proof-of-Stake (PoS) blockchains, like the Cosmos Hub, as well as permissioned Proof-Of-Authority (PoA) blockchains. Blockchains built with the Cosmos SDK are generally referred to as **application-specific blockchains**. -The goal of the Cosmos SDK is to allow developers to easily create custom blockchains from scratch that can natively interoperate with other blockchains. We envision the SDK as the npm-like framework to build secure blockchain applications on top of [Tendermint](https://github.com/tendermint/tendermint). SDK-based blockchains are built out of composable modules, most of which are open source and readily available for any developers to use. Anyone can create a module for the Cosmos-SDK, and integrating already-built modules is as simple as importing them into your blockchain application. What's more, the Cosmos SDK is a capabilities-based system, which allows developers to better reason about the security of interactions between modules. For a deeper look at capabilities, jump to [this section](./ocap.md). +The goal of the Cosmos SDK is to allow developers to easily create custom blockchains from scratch that can natively interoperate with other blockchains. We envision the SDK as the npm-like framework to build secure blockchain applications on top of [Tendermint](https://github.com/tendermint/tendermint). SDK-based blockchains are built out of composable [modules](../building-modules/intro.md), most of which are open source and readily available for any developers to use. Anyone can create a module for the Cosmos-SDK, and integrating already-built modules is as simple as importing them into your blockchain application. What's more, the Cosmos SDK is a capabilities-based system, which allows developers to better reason about the security of interactions between modules. For a deeper look at capabilities, jump to [this section](../core/ocap.md). ## What are Application-Specific Blockchains? @@ -16,18 +16,22 @@ One development paradigm in the blockchain world today is that of virtual-machin Application-specific blockchains offer a radically different development paradigm than virtual-machine blockchains. An application-specific blockchain is a blockchain customized to operate a single application: developers have all the freedom to make the design decisions required for the application to run optimally. They can also provide better sovereignty, security and performance. -To learn more about application-specific blockchains, [click here](./why-app-specific.md). +Learn more about [application-specific blockchains](./why-app-specific.md). ## Why the Cosmos SDK? The Cosmos SDK is the most advanced framework for building custom application-specific blockchains today. Here are a few reasons why you might want to consider building your decentralised application with the Cosmos SDK: - The default consensus engine available within the SDK is [Tendermint Core](https://github.com/tendermint/tendermint). Tendermint is the most (and only) mature BFT consensus engine in existence. It is widely used across the industry and is considered the gold standard consensus engine for building Proof-of-Stake systems. -- The SDK is open source and designed to make it easy to build blockchains out of composable modules. As the ecosystem of open source SDK modules grow, it will become increasingly easier to build complex decentralised platforms with it. +- The SDK is open source and designed to make it easy to build blockchains out of composable [modules](../../x/). As the ecosystem of open source SDK modules grows, it will become increasingly easier to build complex decentralised platforms with it. - The SDK is inspired by capabilities-based security, and informed by years of wrestling with blockchain state-machines. This makes the Cosmos SDK a very secure environment to build blockchains. -- Most importantly, the Cosmos SDK has already been used to build many application-specific blockchains that are already in production. Among others, we can cite [Cosmos Hub](https://hub.cosmos.network), [IRIS Hub](https://irisnet.org), [Binance Chain](https://docs.binance.org/), [Terra](https://terra.money/) or [Lino](https://lino.network/). Many more are building on the Cosmos SDK. You can get a view of the ecosystem [here](https://cosmos.network/ecosystem). +- Most importantly, the Cosmos SDK has already been used to build many application-specific blockchains that are already in production. Among others, we can cite [Cosmos Hub](https://hub.cosmos.network), [IRIS Hub](https://irisnet.org), [Binance Chain](https://docs.binance.org/), [Terra](https://terra.money/) or [Lino](https://lino.network/). [Many more](https://cosmos.network/ecosystem) are building on the Cosmos SDK. ## Getting started with the Cosmos SDK - Learn more about the [architecture of an SDK application](./sdk-app-architecture.md) -- Learn how to build an application-specific blockchain from scratch with the [SDK Tutorial](https://cosmos.network/docs/tutorial) \ No newline at end of file +- Learn how to build an application-specific blockchain from scratch with the [SDK Tutorial](https://cosmos.network/docs/tutorial) + +## Next {hide} + +Learn about [application-specific blockchains](./why-app-specific.md) {hide} \ No newline at end of file diff --git a/docs/intro/sdk-app-architecture.md b/docs/intro/sdk-app-architecture.md index ccf84fc48dbe..4f4f0f3e9051 100644 --- a/docs/intro/sdk-app-architecture.md +++ b/docs/intro/sdk-app-architecture.md @@ -2,7 +2,7 @@ order: 3 --- -# SDK Application Architecture +# Blockchain Architecture ## State machine @@ -30,13 +30,13 @@ In practice, the transactions are bundled in blocks to make the process more eff +--------+ +--------+ ``` -In a blockchain context, the state machine is deterministic. This means that if you start at a given state and replay the same sequence of transactions, you will always end up with the same final state. +In a blockchain context, the state machine is deterministic. This means that if a node is started at a given state and replays the same sequence of transactions, it will always end up with the same final state. -The Cosmos SDK gives you maximum flexibility to define the state of your application, transaction types and state transition functions. The process of building the state-machine with the SDK will be described more in depth in the following sections. But first, let us see how it is replicated using **Tendermint**. +The Cosmos SDK gives developers maximum flexibility to define the state of their application, transaction types and state transition functions. The process of building state-machines with the SDK will be described more in depth in the following sections. But first, let us see how the state-machine is replicated using **Tendermint**. -### Tendermint +## Tendermint -As a developer, you just have to define the state machine using the Cosmos-SDK, and [*Tendermint*](https://tendermint.com/docs/introduction/what-is-tendermint.html) will handle replication over the network for you. +Thanks to the Cosmos SDK, develepers just have to define the state machine, and [*Tendermint*](https://tendermint.com/docs/introduction/what-is-tendermint.html) will handle replication over the network for them. ``` @@ -56,16 +56,13 @@ Blockchain node | | Consensus | | ``` -Tendermint is an application-agnostic engine that is responsible for handling the *networking* and *consensus* layers of your blockchain. In practice, this means that Tendermint is responsible for propagating and ordering transaction bytes. Tendermint Core relies on an eponymous Byzantine-Fault-Tolerant (BFT) algorithm to reach consensus on the order of transactions. For more on Tendermint, click [here](https://tendermint.com/docs/introduction/what-is-tendermint.html). +[Tendermint](https://tendermint.com/docs/introduction/what-is-tendermint.html) is an application-agnostic engine that is responsible for handling the *networking* and *consensus* layers of a blockchain. In practice, this means that Tendermint is responsible for propagating and ordering transaction bytes. Tendermint Core relies on an eponymous Byzantine-Fault-Tolerant (BFT) algorithm to reach consensus on the order of transactions. -The Tendermint consensus algorithm works with a set of special nodes called *Validators*. Validators are responsible for adding blocks of transactions to the blockchain. At any given block, there is a validator set V. A validator in V is chosen by the algorithm to be the proposer of the next block. This block is considered valid if more than two thirds of V signed a *[prevote](https://tendermint.com/docs/spec/consensus/consensus.html#prevote-step-height-h-round-r)* and a *[precommit](https://tendermint.com/docs/spec/consensus/consensus.html#precommit-step-height-h-round-r)* on it, and if all the transactions that it contains are valid. The validator set can be changed by rules written in the state-machine. For a deeper look at the algorithm, click [here](https://tendermint.com/docs/introduction/what-is-tendermint.html#consensus-overview). - - -The main part of a Cosmos SDK application is a blockchain daemon that is run by each node in the network locally. If less than one third of the *validator set* is byzantine (i.e. malicious), then each node should obtain the same result when querying the state at the same time. +The Tendermint [consensus algorithm](https://tendermint.com/docs/introduction/what-is-tendermint.html#consensus-overview) works with a set of special nodes called *Validators*. Validators are responsible for adding blocks of transactions to the blockchain. At any given block, there is a validator set V. A validator in V is chosen by the algorithm to be the proposer of the next block. This block is considered valid if more than two thirds of V signed a *[prevote](https://tendermint.com/docs/spec/consensus/consensus.html#prevote-step-height-h-round-r)* and a *[precommit](https://tendermint.com/docs/spec/consensus/consensus.html#precommit-step-height-h-round-r)* on it, and if all the transactions that it contains are valid. The validator set can be changed by rules written in the state-machine. ## ABCI -Tendermint passes transactions from the network to the application through an interface called the [ABCI](https://github.com/tendermint/tendermint/tree/master/abci), which the application must implement. +Tendermint passes transactions to the application through an interface called the [ABCI](https://tendermint.com/docs/spec/abci/), which the application must implement. ``` +---------------------+ @@ -89,12 +86,15 @@ Note that **Tendermint only handles transaction bytes**. It has no knowledge of Here are the most important messages of the ABCI: -- `CheckTx`: When a transaction is received by Tendermint Core, it is passed to the application to check if a few basic requirements are met. `CheckTx` is used to protect the mempool of full-nodes against spam. A special handler called the "Ante Handler" is used to execute a series of validation steps such as checking for sufficient fees and validating the signatures. If the check is valid, the transaction is added to the [mempool](https://tendermint.com/docs/spec/reactors/mempool/functionality.html#mempool-functionality) and relayed to peer nodes. Note that transactions are not processed (i.e. no modification of the state occurs) with `CheckTx` since they have not been included in a block yet. -- `DeliverTx`: When a [valid block](https://tendermint.com/docs/spec/blockchain/blockchain.html#validation) is received by Tendermint Core, each transaction in the given block is passed to the application via `DeliverTx` to be processed. It is during this stage that the state transitions occur. The "Ante Handler" executes again along with the actual handlers for each message in the transaction. +- `CheckTx`: When a transaction is received by Tendermint Core, it is passed to the application to check if a few basic requirements are met. `CheckTx` is used to protect the mempool of full-nodes against spam transactions. A special handler called the [`AnteHandler`](../basics/gas-fees.md#antehandler) is used to execute a series of validation steps such as checking for sufficient fees and validating the signatures. If the checks are valid, the transaction is added to the [mempool](https://tendermint.com/docs/spec/reactors/mempool/functionality.html#mempool-functionality) and relayed to peer nodes. Note that transactions are not processed (i.e. no modification of the state occurs) with `CheckTx` since they have not been included in a block yet. +- `DeliverTx`: When a [valid block](https://tendermint.com/docs/spec/blockchain/blockchain.html#validation) is received by Tendermint Core, each transaction in the block is passed to the application via `DeliverTx` in order to be processed. It is during this stage that the state transitions occur. The `AnteHandler` executes again along with the actual [`handler`s](../building-modules/handler.md) for each message in the transaction. - `BeginBlock`/`EndBlock`: These messages are executed at the beginning and the end of each block, whether the block contains transaction or not. It is useful to trigger automatic execution of logic. Proceed with caution though, as computationally expensive loops could slow down your blockchain, or even freeze it if the loop is infinite. -For a more detailed view of the ABCI methods and types, click [here](https://tendermint.com/docs/spec/abci/abci.html#overview). +Find a more detailed view of the ABCI methods from the [Tendermint docs](https://tendermint.com/docs/spec/abci/abci.html#overview). Any application built on Tendermint needs to implement the ABCI interface in order to communicate with the underlying local Tendermint engine. Fortunately, you do not have to implement the ABCI interface. The Cosmos SDK provides a boilerplate implementation of it in the form of [baseapp](./sdk-design.md#baseapp). -### Next, let us go into the [high-level design principles of the SDK](./sdk-design.md) \ No newline at end of file + +## Next {hide} + +Read about the [high-level design principles of the SDK](./sdk-design.md) {hide} \ No newline at end of file diff --git a/docs/intro/sdk-design.md b/docs/intro/sdk-design.md index 2462bf07a6bc..0b4f9689f6ed 100644 --- a/docs/intro/sdk-design.md +++ b/docs/intro/sdk-design.md @@ -2,9 +2,9 @@ order: 4 --- -# Cosmos SDK design overview +# Main Components of the Cosmos SDK -The Cosmos SDK is a framework that facilitates the development of secure state-machines on top of Tendermint. At its core, the SDK is a boilerplate implementation of the ABCI in Golang. It comes with a `multistore` to persist data and a `router` to handle transactions. +The Cosmos SDK is a framework that facilitates the development of secure state-machines on top of Tendermint. At its core, the SDK is a boilerplate implementation of the [ABCI](./sdk-app-architecture.md#abci) in Golang. It comes with a [`multistore`](../core/store.md#multistore) to persist data and a [`router`](../core/baseapp.md#routing) to handle transactions. Here is a simplified view of how transactions are handled by an application built on top of the Cosmos SDK when transferred from Tendermint via `DeliverTx`: @@ -13,21 +13,21 @@ Here is a simplified view of how transactions are handled by an application buil 3. Route each message to the appropriate module so that it can be processed. 4. Commit state changes. -The application also enables you to generate transactions, encode them and pass them to the underlying Tendermint engine to broadcast them. - ## `baseapp` -`baseApp` is the boilerplate implementation of the ABCI of the Cosmos SDK. It comes with a `router` to route transactions to their respective module. The main `app.go` file of your application will define your custom `app` type that will embed `baseapp`. This way, your custom `app` type will automatically inherit all the ABCI methods of `baseapp`. See an example of this in the [SDK application tutorial](https://github.com/cosmos/sdk-application-tutorial/blob/c6754a1e313eb1ed973c5c91dcc606f2fd288811/app.go#L73). +`baseapp` is the boilerplate implementation of a Cosmos SDK application. It comes with an implementation of the ABCI to handle the connexion with the underlying consensus engine. Typically, a Cosmos SDK application extends `baseapp` by embedding it in [`app.go`](../basics/app-anatomy.md#core-application-file). See an example of this from the SDK application tutorial: + ++++ https://github.com/cosmos/sdk-tutorials/blob/c6754a1e313eb1ed973c5c91dcc606f2fd288811/app.go#L72-L92 The goal of `baseapp` is to provide a secure interface between the store and the extensible state machine while defining as little about the state machine as possible (staying true to the ABCI). -For more on `baseapp`, please click [here](../concepts/baseapp.md). +For more on `baseapp`, please click [here](../core/baseapp.md). ## Multistore - The Cosmos SDK provides a multistore for persisting state. The multistore allows developers to declare any number of [`KVStores`](https://github.com/blocklayerhq/chainkit). These `KVStores` only accept the `[]byte` type as value and therefore any custom structure needs to be marshalled using [go-amino](https://github.com/tendermint/go-amino) before being stored. + The Cosmos SDK provides a [`multistore`](../core/store.md#multisotre) for persisting state. The multistore allows developers to declare any number of [`KVStores`](../core/store.md#base-layer-kvstores). These `KVStores` only accept the `[]byte` type as value and therefore any custom structure needs to be marshalled using [a codec](../core/encoding.md) before being stored. -The multistore abstraction is used to divide the state in distinct compartments, each managed by its own module. For more on the multistore, click [here](../concepts/store.md) +The multistore abstraction is used to divide the state in distinct compartments, each managed by its own module. For more on the multistore, click [here](../core/store.md#multistore) ## Modules @@ -80,7 +80,7 @@ Here is a simplified view of how a transaction is processed by the application o v ``` -Each module can be seen as a little state-machine. Developers need to define the subset of the state handled by the module, as well as custom message types that modify the state (*Note:* `messages` are extracted from `transactions` using `baseapp`). In general, each module declares its own `KVStore` in the multistore to persist the subset of the state it defines. Most developers will need to access other 3rd party modules when building their own modules. Given that the Cosmos-SDK is an open framework, some of the modules may be malicious, which means there is a need for security principles to reason about inter-module interactions. These principles are based on [object-capabilities](../core/ocap.md). In practice, this means that instead of having each module keep an access control list for other modules, each module implements special objects called `keepers` that can be passed to other modules to grant a pre-defined set of capabilities. +Each module can be seen as a little state-machine. Developers need to define the subset of the state handled by the module, as well as custom message types that modify the state (*Note:* `messages` are extracted from `transactions` by `baseapp`). In general, each module declares its own `KVStore` in the `multistore` to persist the subset of the state it defines. Most developers will need to access other 3rd party modules when building their own modules. Given that the Cosmos-SDK is an open framework, some of the modules may be malicious, which means there is a need for security principles to reason about inter-module interactions. These principles are based on [object-capabilities](../core/ocap.md). In practice, this means that instead of having each module keep an access control list for other modules, each module implements special objects called `keepers` that can be passed to other modules to grant a pre-defined set of capabilities. SDK modules are defined in the `x/` folder of the SDK. Some core modules include: @@ -90,5 +90,7 @@ SDK modules are defined in the `x/` folder of the SDK. Some core modules include In addition to the already existing modules in `x/`, that anyone can use in their app, the SDK lets you build your own custom modules. You can check an [example of that in the tutorial](https://cosmos.network/docs/tutorial/keeper.html). +## Next {hide} + +Learn more about the [anatomy of an SDK application](../basics/app-anatomy.md) {hide} -### Next, learn more about the security model of the Cosmos SDK, [ocap](../core/ocap.md) diff --git a/docs/intro/why-app-specific.md b/docs/intro/why-app-specific.md index 54f1169d0071..cd37b562126c 100644 --- a/docs/intro/why-app-specific.md +++ b/docs/intro/why-app-specific.md @@ -30,11 +30,11 @@ Blockchain node | | Consensus | | Virtual-machine blockchains like Ethereum addressed the demand for more programmability back in 2014. At the time, the options available for building decentralised applications were quite limited. Most developers would build on top of the complex and limited Bitcoin scripting language, or fork the Bitcoin codebase which was hard to work with and customize. -Virtual-machine blockchains came in with a new value proposition. Their state-machine incorporates a virtual-machine that is able to interpret turing-complete programs called Smart Contracts. These Smart Contracts are very good for use cases like one-time events (e.g. ICOs), but they can fall short for building complex decentralised platforms: +Virtual-machine blockchains came in with a new value proposition. Their state-machine incorporates a virtual-machine that is able to interpret turing-complete programs called Smart Contracts. These Smart Contracts are very good for use cases like one-time events (e.g. ICOs), but they can fall short for building complex decentralised platforms. Here is why: -- Smart Contracts are generally developed with specific programming languages that can be interpreted by the underlying virtual-machine. These programming languages are often immature and inherently limited by the constraints of the virtual-machine. For example, the Ethereum Virtual Machine does not allow developers to implement automatic execution of code. Developers are also limited to the account-based system of the EVM, and they can only choose from a limited set of functions for their cryptographic operations. These are examples, but they hint at the lack of **flexibility** a smart contract environment often entails. +- Smart Contracts are generally developed with specific programming languages that can be interpreted by the underlying virtual-machine. These programming languages are often immature and inherently limited by the constraints of the virtual-machine itself. For example, the Ethereum Virtual Machine does not allow developers to implement automatic execution of code. Developers are also limited to the account-based system of the EVM, and they can only choose from a limited set of functions for their cryptographic operations. These are examples, but they hint at the lack of **flexibility** that a smart contract environment often entails. - Smart Contracts are all run by the same virtual machine. This means that they compete for resources, which can severly restrain **performance**. And even if the state-machine were to be split in multiple subsets (e.g. via sharding), Smart Contracts would still need to be interpeted by a virtual machine, which would limit performance compared to a native application implemented at state-machine level (our benchmarks show an improvement on the order of x10 in performance when the virtual-machine is removed). -- Another issue with the fact that Smart Contracts share the same underlying environment is the resulting limitation in **sovereignty**. A decentralised application is an ecosystem that involves multiple players. If the application is built on a general-purpose virtual-machine blockchain, these players have very limited sovereignty over it, and are ultimately superseded by the governance of the underlying blockchain. If there is a bug in the application, very little can be done about it. +- Another issue with the fact that Smart Contracts share the same underlying environment is the resulting limitation in **sovereignty**. A decentralised application is an ecosystem that involves multiple players. If the application is built on a general-purpose virtual-machine blockchain, stakeholders have very limited sovereignty over their application, and are ultimately superseded by the governance of the underlying blockchain. If there is a bug in the application, very little can be done about it. Application-Specific Blockchains are designed to address these shortcomings. @@ -46,7 +46,7 @@ Application-specific blockchains give maximum flexibility to developers: - In Cosmos blockchains, the state-machine is typically connected to the underlying consensus engine via an interface called the [ABCI](https://tendermint.com/docs/spec/abci/). This interface can be wrapped in any programming language, meaning developers can build their state-machine in the programming language of their choice. - Developers can choose among multiple frameworks to build their state-machine. The most widely used today is the Cosmos SDK, but others exist (e.g. [Lotion](https://github.com/nomic-io/lotion), [Weave](https://github.com/iov-one/weave), ...). The choice will most of the time be done based on the programming language they want to use (Cosmos SDK and Weave are in Golang, Lotion is in Javascript, ...). -- The ABCI also allows developers to swap the consensus engine of their application-specific blockchain. Today, only Tendermint is production-ready, but in the future other engines are expected to emerge. +- The ABCI also allows developers to swap the consensus engine of their application-specific blockchain. Today, only Tendermint is production-ready, but in the future other consensus engines are expected to emerge. - Even when they settle for a framework and consensus engine, developers still have the freedom to tweak them if they don't perfectly match their requirements in their pristine forms. - Developers are free to explore the full spectrum of tradeoffs (e.g. number of validators vs transaction throughput, safety vs availability in asynchrony, ...) and design choices (DB or IAVL tree for storage, UTXO or account model, ...). - Developers can implement automatic execution of code. In the Cosmos SDK, logic can be automatically triggered at the beginning and the end of each block. They are also free to choose the cryptographic library used in their application, as opposed to being constrained by what is made available by the underlying environment in the case of virtual-machine blockchains. @@ -55,7 +55,7 @@ The list above contains a few examples that show how much flexibility applicatio ### Performance -Decentralised applications built with Smart Contracts are inherently capped in performance by the underlying environment. For a decentralised application to optimise performance, it needs to be built as an application-specific blockchains. Here are the benefits of an application-specific blockchains with regards to performance: +Decentralised applications built with Smart Contracts are inherently capped in performance by the underlying environment. For a decentralised application to optimise performance, it needs to be built as an application-specific blockchains. Next are some of the benefits an application-specific blockchains brings in terms of performance: - Developers of application-specific blockchains can choose to operate with novel consensus engine such as Tendermint BFT. Compared to Proof-of-Work (used by most virtual-machine blockchains today), it offers significant gains in throuhgput. - An application-specific blockchain only operates a single application, so that the application does not compete with others for computation and storage. This is the opposite of most non-sharded virtual-machine blockchains today, where smart contracts all compete for computation and storage. @@ -71,13 +71,10 @@ Security is hard to quantify, and greatly varies from platform to platform. That ### Sovereignty -One of the major benefits of application-specific blockchains is sovereignty. A decentralised application is an ecosystem that involves many actors: users, developers, third-party services, and more. When developers build on virtual-machine blockchain where many decentralised applications coexist, the community of the application is different than the community of the underlying blockchain, and the latter supersedes the former. If there is a bug or if a new feature is needed, the community of the application has very little sovereignty to upgrade the code. If the community of the underlying blockchain refuses to act, nothing can happen. +One of the major benefits of application-specific blockchains is sovereignty. A decentralised application is an ecosystem that involves many actors: users, developers, third-party services, and more. When developers build on virtual-machine blockchain where many decentralised applications coexist, the community of the application is different than the community of the underlying blockchain, and the latter supersedes the former in the governance process. If there is a bug or if a new feature is needed, stakeholders of the application have very little leeway to upgrade the code. If the community of the underlying blockchain refuses to act, nothing can happen. -The fundamental issue here is that the governance of the application and the governance of the network are not aligned. This issue is solved by application-specific blockchains. Because application-specific blockchains specialize to operate a single application, the community of the application has full control over the entire chain. This ensures the community will not be stuck if a bug is discovered, and that it has the entire freedom to choose how it is going to evolve. +The fundamental issue here is that the governance of the application and the governance of the network are not aligned. This issue is solved by application-specific blockchains. Because application-specific blockchains specialize to operate a single application, stakeholders the application has full control over the entire chain. This ensures the community will not be stuck if a bug is discovered, and that it has the entire freedom to choose how it is going to evolve. -## Start Building Your Application-Specific Blockchain Today +## Next {hide} -Clearly, application-specific blockchains are awesome. The Cosmos SDK makes it easier than ever to build them. What are you waiting for? - -- Learn more about the [high-level architecture](./sdk-app-architecture) of an SDK application. -- Learn how to build an application-specific blockchain from scratch with the [SDK tutorial](https://cosmos.network/docs/tutorial) +Learn more about the [high-level architecture](./sdk-app-architecture.md) of an SDK application {hide} diff --git a/docs/kr/README.md b/docs/kr/README.md index 5ac84b1455ee..86c60314bd7a 100755 --- a/docs/kr/README.md +++ b/docs/kr/README.md @@ -1,3 +1,8 @@ +--- +parent: + order: false +--- + # 코스모스 SDK 문서에 오신 걸 환영합니다! ::: warning diff --git a/docs/package-lock.json b/docs/package-lock.json index 52587236f7bc..1100a982c2a5 100644 --- a/docs/package-lock.json +++ b/docs/package-lock.json @@ -5,271 +5,289 @@ "requires": true, "dependencies": { "@babel/code-frame": { - "version": "7.0.0", - "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz", - "integrity": "sha512-OfC2uemaknXr87bdLUkWog7nYuliM9Ij5HUcajsVcMCpQrcLmtxRbVFTIqmcSkSeYRBFBRxs2FiUqFJDLdiebA==", - 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"dev": true, "requires": { "locate-path": "^2.0.0" } @@ -3960,28 +3780,25 @@ "version": "1.1.1", "resolved": "https://registry.npmjs.org/flush-write-stream/-/flush-write-stream-1.1.1.tgz", "integrity": "sha512-3Z4XhFZ3992uIq0XOqb9AreonueSYphE6oYbpt5+3u06JWklbsPkNv3ZKkP9Bz/r+1MWCaMoSQ28P85+1Yc77w==", - "dev": true, "requires": { "inherits": "^2.0.3", "readable-stream": "^2.3.6" } }, "follow-redirects": { - "version": "1.7.0", - "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.7.0.tgz", - "integrity": "sha512-m/pZQy4Gj287eNy94nivy5wchN3Kp+Q5WgUPNy5lJSZ3sgkVKSYV/ZChMAQVIgx1SqfZ2zBZtPA2YlXIWxxJOQ==", - "dev": true, + "version": "1.5.10", + "resolved": "https://registry.npmjs.org/follow-redirects/-/follow-redirects-1.5.10.tgz", + "integrity": "sha512-0V5l4Cizzvqt5D44aTXbFZz+FtyXV1vrDN6qrelxtfYQKW0KO0W2T/hkE8xvGa/540LkZlkaUjO4ailYTFtHVQ==", "requires": { - "debug": "^3.2.6" + "debug": "=3.1.0" }, "dependencies": { "debug": { - "version": "3.2.6", - "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.6.tgz", - 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"dev": true + "integrity": "sha1-+8cfDEGt6zf5bFd60e1C2P2sypE=" }, "form-data": { "version": "2.3.3", "resolved": "https://registry.npmjs.org/form-data/-/form-data-2.3.3.tgz", "integrity": "sha512-1lLKB2Mu3aGP1Q/2eCOx0fNbRMe7XdwktwOruhfqqd0rIJWwN4Dh+E3hrPSlDCXnSR7UtZ1N38rVXm+6+MEhJQ==", - "dev": true, "requires": { "asynckit": "^0.4.0", "combined-stream": "^1.0.6", @@ -4018,14 +3831,12 @@ "forwarded": { "version": "0.1.2", "resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.1.2.tgz", - "integrity": "sha1-mMI9qxF1ZXuMBXPozszZGw/xjIQ=", - "dev": true + "integrity": "sha1-mMI9qxF1ZXuMBXPozszZGw/xjIQ=" }, "fragment-cache": { "version": "0.2.1", "resolved": "https://registry.npmjs.org/fragment-cache/-/fragment-cache-0.2.1.tgz", "integrity": "sha1-QpD60n8T6Jvn8zeZxrxaCr//DRk=", - "dev": true, "requires": { "map-cache": "^0.2.2" } @@ -4033,14 +3844,12 @@ "fresh": { "version": "0.5.2", "resolved": "https://registry.npmjs.org/fresh/-/fresh-0.5.2.tgz", - "integrity": "sha1-PYyt2Q2XZWn6g1qx+OSyOhBWBac=", - "dev": true + "integrity": "sha1-PYyt2Q2XZWn6g1qx+OSyOhBWBac=" }, "from2": { "version": "2.3.0", "resolved": "https://registry.npmjs.org/from2/-/from2-2.3.0.tgz", "integrity": "sha1-i/tVAr3kpNNs/e6gB/zKIdfjgq8=", - "dev": true, "requires": { "inherits": "^2.0.1", "readable-stream": "^2.0.0" @@ -4050,7 +3859,6 @@ "version": "7.0.1", "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-7.0.1.tgz", "integrity": "sha512-YJDaCJZEnBmcbw13fvdAM9AwNOJwOzrE4pqMqBq5nFiEqXUqHwlK4B+3pUw6JNvfSPtX05xFHtYy/1ni01eGCw==", - "dev": true, "requires": { "graceful-fs": "^4.1.2", "jsonfile": "^4.0.0", @@ -4061,7 +3869,6 @@ "version": "1.0.10", "resolved": "https://registry.npmjs.org/fs-write-stream-atomic/-/fs-write-stream-atomic-1.0.10.tgz", "integrity": "sha1-tH31NJPvkR33VzHnCp3tAYnbQMk=", - "dev": true, "requires": { "graceful-fs": "^4.1.2", "iferr": "^0.1.5", @@ -4072,14 +3879,12 @@ "fs.realpath": { "version": "1.0.0", "resolved": "https://registry.npmjs.org/fs.realpath/-/fs.realpath-1.0.0.tgz", - "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=", - "dev": true + "integrity": "sha1-FQStJSMVjKpA20onh8sBQRmU6k8=" }, "fsevents": { "version": "1.2.9", "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-1.2.9.tgz", "integrity": "sha512-oeyj2H3EjjonWcFjD5NvZNE9Rqe4UW+nQBU2HNeKw0koVLEFIhtyETyAakeAM3de7Z/SW5kcA+fZUait9EApnw==", - "dev": true, "optional": true, "requires": { "nan": "^2.12.1", @@ -4089,25 +3894,21 @@ "abbrev": { "version": "1.1.1", "bundled": true, - "dev": true, "optional": true }, "ansi-regex": { "version": "2.1.1", "bundled": true, - "dev": true, "optional": true }, "aproba": { "version": "1.2.0", "bundled": true, - "dev": true, "optional": true }, "are-we-there-yet": { "version": "1.1.5", "bundled": true, - "dev": true, "optional": true, "requires": { "delegates": "^1.0.0", @@ -4117,13 +3918,11 @@ "balanced-match": { "version": "1.0.0", "bundled": true, - "dev": true, "optional": true }, "brace-expansion": { "version": "1.1.11", "bundled": true, - "dev": true, "optional": true, "requires": { "balanced-match": "^1.0.0", @@ -4133,37 +3932,31 @@ "chownr": { "version": "1.1.1", "bundled": true, - "dev": true, "optional": true }, "code-point-at": { "version": "1.1.0", "bundled": true, - "dev": true, "optional": true }, "concat-map": { "version": "0.0.1", "bundled": true, - "dev": true, "optional": true }, "console-control-strings": { "version": "1.1.0", "bundled": true, - "dev": true, "optional": true }, "core-util-is": { "version": "1.0.2", "bundled": true, - "dev": true, "optional": true }, "debug": { "version": "4.1.1", "bundled": true, - "dev": true, "optional": true, "requires": { "ms": "^2.1.1" @@ -4172,25 +3965,21 @@ "deep-extend": { "version": "0.6.0", "bundled": true, - "dev": true, "optional": true }, "delegates": { "version": "1.0.0", "bundled": true, - "dev": true, "optional": true }, "detect-libc": { "version": "1.0.3", "bundled": true, - "dev": true, "optional": true }, "fs-minipass": { "version": "1.2.5", "bundled": true, - "dev": true, "optional": true, "requires": { "minipass": "^2.2.1" @@ -4199,13 +3988,11 @@ "fs.realpath": { "version": "1.0.0", "bundled": true, - "dev": true, "optional": true }, "gauge": { "version": "2.7.4", "bundled": true, - "dev": true, "optional": true, "requires": { "aproba": "^1.0.3", @@ -4221,7 +4008,6 @@ "glob": { "version": "7.1.3", "bundled": true, - "dev": true, "optional": true, "requires": { "fs.realpath": "^1.0.0", @@ -4235,13 +4021,11 @@ "has-unicode": { "version": "2.0.1", "bundled": true, - "dev": true, "optional": true }, "iconv-lite": { "version": "0.4.24", "bundled": true, - "dev": true, "optional": true, "requires": { "safer-buffer": ">= 2.1.2 < 3" @@ -4250,7 +4034,6 @@ "ignore-walk": { "version": "3.0.1", "bundled": true, - "dev": true, "optional": true, "requires": { "minimatch": "^3.0.4" @@ -4259,7 +4042,6 @@ "inflight": { "version": "1.0.6", "bundled": true, - "dev": true, "optional": true, "requires": { "once": "^1.3.0", @@ -4269,19 +4051,16 @@ "inherits": { "version": "2.0.3", "bundled": true, - "dev": true, "optional": true }, "ini": { "version": "1.3.5", "bundled": true, - "dev": true, "optional": true }, "is-fullwidth-code-point": { "version": "1.0.0", "bundled": true, - "dev": true, "optional": true, "requires": { "number-is-nan": "^1.0.0" @@ -4290,13 +4069,11 @@ "isarray": { "version": "1.0.0", "bundled": true, - "dev": true, "optional": true }, "minimatch": { "version": "3.0.4", "bundled": true, - "dev": true, "optional": true, "requires": { "brace-expansion": "^1.1.7" @@ -4305,13 +4082,11 @@ "minimist": { "version": "0.0.8", "bundled": true, - "dev": true, "optional": true }, "minipass": { "version": "2.3.5", "bundled": true, - "dev": true, "optional": true, "requires": { "safe-buffer": "^5.1.2", @@ -4321,7 +4096,6 @@ "minizlib": { "version": "1.2.1", "bundled": true, - "dev": true, "optional": true, "requires": { "minipass": "^2.2.1" @@ -4330,7 +4104,6 @@ "mkdirp": { "version": "0.5.1", "bundled": true, - "dev": true, "optional": true, "requires": { "minimist": "0.0.8" @@ -4339,13 +4112,11 @@ "ms": { "version": "2.1.1", "bundled": true, - "dev": true, "optional": true }, "needle": { "version": "2.3.0", "bundled": true, - "dev": true, "optional": true, "requires": { "debug": "^4.1.0", @@ -4356,7 +4127,6 @@ "node-pre-gyp": { "version": "0.12.0", "bundled": true, - "dev": true, "optional": true, "requires": { "detect-libc": "^1.0.2", @@ -4374,7 +4144,6 @@ "nopt": { "version": "4.0.1", "bundled": true, - "dev": true, "optional": true, "requires": { "abbrev": "1", @@ -4384,13 +4153,11 @@ "npm-bundled": { "version": "1.0.6", "bundled": true, - "dev": true, "optional": true }, "npm-packlist": { "version": "1.4.1", "bundled": true, - "dev": true, "optional": true, "requires": { "ignore-walk": "^3.0.1", @@ -4400,7 +4167,6 @@ "npmlog": { "version": "4.1.2", "bundled": true, - "dev": true, "optional": true, "requires": { "are-we-there-yet": "~1.1.2", @@ -4412,19 +4178,16 @@ "number-is-nan": { "version": "1.0.1", "bundled": true, - "dev": true, "optional": true }, "object-assign": { "version": "4.1.1", "bundled": true, - "dev": true, "optional": true }, "once": { "version": "1.4.0", "bundled": true, - "dev": true, "optional": true, "requires": { "wrappy": "1" @@ -4433,19 +4196,16 @@ "os-homedir": { "version": "1.0.2", "bundled": true, - "dev": true, "optional": true }, "os-tmpdir": { "version": "1.0.2", "bundled": true, - "dev": true, "optional": true }, "osenv": { "version": "0.1.5", "bundled": true, - "dev": true, "optional": true, "requires": { "os-homedir": "^1.0.0", @@ -4455,19 +4215,16 @@ "path-is-absolute": { "version": "1.0.1", "bundled": true, - "dev": true, "optional": true }, "process-nextick-args": { "version": "2.0.0", "bundled": true, - "dev": true, "optional": true }, "rc": { "version": "1.2.8", "bundled": true, - "dev": true, "optional": true, "requires": { "deep-extend": "^0.6.0", @@ -4479,7 +4236,6 @@ "minimist": { "version": "1.2.0", "bundled": true, - "dev": true, "optional": true } } @@ -4487,7 +4243,6 @@ "readable-stream": { "version": "2.3.6", "bundled": true, - "dev": true, "optional": true, "requires": { "core-util-is": "~1.0.0", @@ -4502,7 +4257,6 @@ "rimraf": { "version": "2.6.3", "bundled": true, - "dev": true, "optional": true, "requires": { "glob": "^7.1.3" @@ -4511,43 +4265,36 @@ "safe-buffer": { "version": "5.1.2", "bundled": true, - "dev": true, "optional": true }, "safer-buffer": { "version": "2.1.2", "bundled": true, - "dev": true, "optional": true }, "sax": { "version": "1.2.4", "bundled": true, - "dev": true, "optional": true }, "semver": { "version": "5.7.0", "bundled": true, - "dev": true, "optional": true }, "set-blocking": { "version": "2.0.0", "bundled": true, - "dev": true, "optional": true }, "signal-exit": { "version": "3.0.2", "bundled": true, - "dev": true, "optional": true }, "string-width": { "version": "1.0.2", "bundled": true, - "dev": true, "optional": true, "requires": { "code-point-at": "^1.0.0", @@ -4558,7 +4305,6 @@ "string_decoder": { "version": "1.1.1", "bundled": true, - "dev": true, "optional": true, "requires": { "safe-buffer": "~5.1.0" @@ -4567,7 +4313,6 @@ "strip-ansi": { "version": "3.0.1", "bundled": true, - "dev": true, "optional": true, "requires": { "ansi-regex": "^2.0.0" @@ -4576,13 +4321,11 @@ "strip-json-comments": { "version": "2.0.1", "bundled": true, - "dev": true, "optional": true }, "tar": { "version": "4.4.8", "bundled": true, - "dev": true, "optional": true, "requires": { "chownr": "^1.1.1", @@ -4597,13 +4340,11 @@ "util-deprecate": { "version": "1.0.2", "bundled": true, - "dev": true, "optional": true }, "wide-align": { "version": "1.1.3", "bundled": true, - "dev": true, "optional": true, "requires": { "string-width": "^1.0.2 || 2" @@ -4612,13 +4353,11 @@ "wrappy": { "version": "1.0.2", "bundled": true, - "dev": true, "optional": true }, "yallist": { "version": "3.0.3", "bundled": true, - "dev": true, "optional": true } } @@ -4626,20 +4365,22 @@ "function-bind": { "version": "1.1.1", "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.1.tgz", - "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==", - "dev": true + "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==" + }, + "fuse.js": { + "version": "3.4.6", + "resolved": "https://registry.npmjs.org/fuse.js/-/fuse.js-3.4.6.tgz", + "integrity": "sha512-H6aJY4UpLFwxj1+5nAvufom5b2BT2v45P1MkPvdGIK8fWjQx/7o6tTT1+ALV0yawQvbmvCF0ufl2et8eJ7v7Cg==" }, "get-caller-file": { "version": "1.0.3", "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.3.tgz", - "integrity": "sha512-3t6rVToeoZfYSGd8YoLFR2DJkiQrIiUrGcjvFX2mDw3bn6k2OtwHN0TNCLbBO+w8qTvimhDkv+LSscbJY1vE6w==", - "dev": true + "integrity": "sha512-3t6rVToeoZfYSGd8YoLFR2DJkiQrIiUrGcjvFX2mDw3bn6k2OtwHN0TNCLbBO+w8qTvimhDkv+LSscbJY1vE6w==" }, "get-stream": { "version": "4.1.0", "resolved": "https://registry.npmjs.org/get-stream/-/get-stream-4.1.0.tgz", "integrity": "sha512-GMat4EJ5161kIy2HevLlr4luNjBgvmj413KaQA7jt4V8B4RDsfpHk7WQ9GVqfYyyx8OS/L66Kox+rJRNklLK7w==", - "dev": true, "requires": { "pump": "^3.0.0" } @@ -4647,23 +4388,20 @@ "get-value": { "version": "2.0.6", "resolved": "https://registry.npmjs.org/get-value/-/get-value-2.0.6.tgz", - "integrity": "sha1-3BXKHGcjh8p2vTesCjlbogQqLCg=", - "dev": true + "integrity": "sha1-3BXKHGcjh8p2vTesCjlbogQqLCg=" }, "getpass": { "version": "0.1.7", "resolved": "https://registry.npmjs.org/getpass/-/getpass-0.1.7.tgz", "integrity": "sha1-Xv+OPmhNVprkyysSgmBOi6YhSfo=", - "dev": true, "requires": { "assert-plus": "^1.0.0" } }, "glob": { - "version": "7.1.4", - "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.4.tgz", - "integrity": "sha512-hkLPepehmnKk41pUGm3sYxoFs/umurYfYJCerbXEyFIWcAzvpipAgVkBqqT9RBKMGjnq6kMuyYwha6csxbiM1A==", - "dev": true, + "version": "7.1.6", + "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.6.tgz", + "integrity": "sha512-LwaxwyZ72Lk7vZINtNNrywX0ZuLyStrdDtabefZKAY5ZGJhVtgdznluResxNmPitE0SAO+O26sWTHeKSI2wMBA==", "requires": { "fs.realpath": "^1.0.0", "inflight": "^1.0.4", @@ -4677,7 +4415,6 @@ "version": "3.1.0", "resolved": "https://registry.npmjs.org/glob-parent/-/glob-parent-3.1.0.tgz", "integrity": "sha1-nmr2KZ2NO9K9QEMIMr0RPfkGxa4=", - "dev": true, "requires": { "is-glob": "^3.1.0", "path-dirname": "^1.0.0" @@ -4687,7 +4424,6 @@ "version": "3.1.0", "resolved": "https://registry.npmjs.org/is-glob/-/is-glob-3.1.0.tgz", "integrity": "sha1-e6WuJCF4BKxwcHuWkiVnSGzD6Eo=", - "dev": true, "requires": { "is-extglob": "^2.1.0" } @@ -4697,14 +4433,12 @@ "glob-to-regexp": { "version": "0.3.0", "resolved": "https://registry.npmjs.org/glob-to-regexp/-/glob-to-regexp-0.3.0.tgz", - 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"serve": "vuepress dev", - "build": "vuepress build" + "preserve": "./pre.sh", + "serve": "trap 'exit 0' SIGINT; vuepress dev", + "postserve": "./post.sh", + "prebuild": "./pre.sh", + "build": "trap 'exit 0' SIGINT; vuepress build --no-cache", + "postbuild": "./post.sh" }, "author": "", "license": "ISC", - "devDependencies": { - "@vuepress/plugin-google-analytics": "^1.2.0", - "lodash": "^4.17.13", - "markdown-it": "^8.4.2", - "markdown-it-meta": "0.0.1", - "vuepress": "^1.0.2" - }, "dependencies": { - "axios": "^0.19.0" + "vuepress-theme-cosmos": "^1.0.93" } } diff --git a/docs/post.sh b/docs/post.sh new file mode 100755 index 000000000000..5d8c7ed48737 --- /dev/null +++ b/docs/post.sh @@ -0,0 +1,3 @@ +#!/usr/bin/env bash + +rm -rf modules \ No newline at end of file diff --git a/docs/pre.sh b/docs/pre.sh new file mode 100755 index 000000000000..a71ac0b65d5e --- /dev/null +++ b/docs/pre.sh @@ -0,0 +1,12 @@ +#!/usr/bin/env bash + +mkdir -p modules + +for D in ../x/*; do + if [ -d "${D}" ]; then + rm -rf "modules/$(echo $D | awk -F/ '{print $NF}')" + mkdir -p "modules/$(echo $D | awk -F/ '{print $NF}')" && cp -r $D/spec/* "$_" + fi +done + +cp ../x/README.md modules/ \ No newline at end of file diff --git a/docs/ru/readme.md b/docs/ru/readme.md index 6f9cc8f33199..c8872c30fa41 100644 --- a/docs/ru/readme.md +++ b/docs/ru/readme.md @@ -1 +1,6 @@ -# RU \ No newline at end of file +--- +parent: + order: false +--- + +# RU diff --git a/docs/spec/README.md b/docs/spec/README.md index f287a9601e3f..2dd2321be23c 100644 --- a/docs/spec/README.md +++ b/docs/spec/README.md @@ -1,3 +1,8 @@ +--- +parent: + order: false +--- + # Specifications This directory contains specifications for the modules of the Cosmos SDK as well as Interchain Standards (ICS) and other specifications. @@ -13,17 +18,9 @@ block. ## Modules specifications -- [Auth](../../x/auth/spec) - The structure and authentication of accounts and transactions. -- [Bank](../../x/bank/spec) - Sending tokens. -- [Governance](../../x/gov/spec) - Proposals and voting. -- [Staking](../../x/staking/spec) - Proof-of-stake bonding, delegation, etc. -- [Slashing](../../x/slashing/spec) - Validator punishment mechanisms. -- [Distribution](../../x/distribution/spec) - Fee distribution, and staking token provision distribution. -- [Crisis](.../../x/crisis/spec) - Halting the blockchain under certain circumstances. -- [Mint](../../x/mint/spec) - Staking token provision creation. -- [Params](../../x/params/spec) - Globally available parameter store. -- [Supply](../../x/supply/spec) - Total supply of the chain. -- [NFT](https://github.com/cosmos/modules/tree/master/incubator/nft/docs/spec) - Non-fungible tokens. +Go the [module directory](../../x/README.md) + +## Tendermint For details on the underlying blockchain and p2p protocols, see the [Tendermint specification](https://github.com/tendermint/tendermint/tree/master/docs/spec). diff --git a/docs/using-the-sdk/README.md b/docs/using-the-sdk/README.md new file mode 100644 index 000000000000..ef0f84c16fb2 --- /dev/null +++ b/docs/using-the-sdk/README.md @@ -0,0 +1,10 @@ +--- +parent: + order: false +--- + +# Using the SDK + +- [Modules](../../x/README.md) +- [Simulation](./simulation.md) + diff --git a/docs/concepts/using-the-sdk/simulation.md b/docs/using-the-sdk/simulation.md similarity index 100% rename from docs/concepts/using-the-sdk/simulation.md rename to docs/using-the-sdk/simulation.md diff --git a/x/README.md b/x/README.md new file mode 100644 index 000000000000..a38c7ab3dd31 --- /dev/null +++ b/x/README.md @@ -0,0 +1,22 @@ +--- +parent: + order: false +--- + +# List of Modules + +Here are some production-grade modules that can be used in Cosmos SDK applications, along with their respective documentation: + +- [Auth](./x/auth/spec/README.md) - Authentication of accounts and transactions for Cosmos SDK application. +- [Bank](./x/bank/spec/README.md) - Token transfer functionalities. +- [Governance](./x/gov/spec/README.md) - On-chain proposals and voting. +- [Staking](./x/staking/spec/README.md) - Proof-of-stake layer for public blockchains. +- [Slashing](.x/slashing/spec/README.md) - Validator punishment mechanisms. +- [Distribution](.x/distribution/spec/README.md) - Fee distribution, and staking token provision distribution. +- [Crisis](./x/crisis/spec/README.md) - Halting the blockchain under certain circumstances (e.g. if an invariant is broken). +- [Mint](./x/mint/spec/README.md) - Creation of new units of staking token. +- [Params](./x/params/spec/README.md) - Globally available parameter store. +- [Supply](./x/supply/spec/README.md) - Total token supply of the chain. + +To learn more about the process of building modules, visit the [building modules reference documentation](../docs/building-modules/README.md). + diff --git a/x/auth/spec/README.md b/x/auth/spec/README.md index 1e57a39c095e..8dd0a2dd2209 100644 --- a/x/auth/spec/README.md +++ b/x/auth/spec/README.md @@ -1,4 +1,4 @@ -# Auth module specification +# `auth` ## Abstract diff --git a/x/bank/spec/README.md b/x/bank/spec/README.md index f4c583af98b6..1f5ad958a915 100644 --- a/x/bank/spec/README.md +++ b/x/bank/spec/README.md @@ -1,4 +1,4 @@ -# Bank module specification +# `bank` ## Abstract diff --git a/x/crisis/spec/README.md b/x/crisis/spec/README.md index 6fae6fe52e0f..48847155135a 100644 --- a/x/crisis/spec/README.md +++ b/x/crisis/spec/README.md @@ -1,4 +1,4 @@ -# Crisis +# `crisis` ## Overview diff --git a/x/distribution/spec/README.md b/x/distribution/spec/README.md index cf306c4e45e5..7540bcd8997f 100644 --- a/x/distribution/spec/README.md +++ b/x/distribution/spec/README.md @@ -1,4 +1,4 @@ -# Distribution +# `distribution` ## Overview diff --git a/x/gov/spec/README.md b/x/gov/spec/README.md index 5f9ebc31ca35..8276fa72ba2a 100644 --- a/x/gov/spec/README.md +++ b/x/gov/spec/README.md @@ -1,4 +1,4 @@ -# Governance module specification +# `gov` ## Abstract diff --git a/x/mint/spec/README.md b/x/mint/spec/README.md index b7e0ef9e065d..b4d9a1ddc86b 100644 --- a/x/mint/spec/README.md +++ b/x/mint/spec/README.md @@ -1,4 +1,4 @@ -# Mint Specification +# `mint` ## Contents diff --git a/x/params/spec/README.md b/x/params/spec/README.md index a7728e8680e8..503e6b51d24d 100644 --- a/x/params/spec/README.md +++ b/x/params/spec/README.md @@ -1,4 +1,4 @@ -# Params module specification +# `params` ## Abstract diff --git a/x/slashing/spec/README.md b/x/slashing/spec/README.md index 0f0111433c31..c70dc220f16d 100644 --- a/x/slashing/spec/README.md +++ b/x/slashing/spec/README.md @@ -1,4 +1,4 @@ -# Slashing module specification +# `slashing` ## Abstract diff --git a/x/staking/spec/README.md b/x/staking/spec/README.md index a34274b7a112..9e4a9a99e677 100644 --- a/x/staking/spec/README.md +++ b/x/staking/spec/README.md @@ -1,4 +1,4 @@ -# Staking module specification +# `staking` ## Abstract diff --git a/x/supply/spec/README.md b/x/supply/spec/README.md index e637bc013187..d9ef2b1075d9 100644 --- a/x/supply/spec/README.md +++ b/x/supply/spec/README.md @@ -1,4 +1,4 @@ -# Supply Specification +# `supply` ## Contents