service-core

Pryv.io core server app components, i.e. what runs on each server node and handles user data.

Installation

Prerequisites:

• make and support for C/C++ compilation
  • Linux: e.g. sudo apt-get install build-essentials
  • MacOS: e.g. xcode-select --install (installs command line tools)
• Node.js 16
  • Use nvm, nodenv or n to manage multiple versions
• Mongo DB 4.2 (needs at least 4GB of free disk space for the initial database)
  • MacOS & Linux: already included in scripts/setup-dev-env
• InfluxDB 1.2
  • Linux: scripts/setup-influx
  • MacOS: e.g. brew install influxdb@1
• nats-server
  • Linux: scripts/setup-nats-server
  • MacOS: e.g. brew install nats-server
• graphicsmagick (for image events preview)
  • Linux: e.g. sudo apt-get install graphicsmagick
  • MacOS: e.g. brew install graphicsmagick
• just

Then:

1. just setup-dev-env to setup local file structure and install MongoDB
2. just install [--no-optional] to install node modules
3. just compile-dev for the initial code compilation into dist

Dev environment basics

The project is structured as a monorepo with components (a.k.a. workspaces in NPM), each component defining its package.json, tests, configs, etc. in components/<name>/.

Scripts are run with just:

just <command> [params]

Notes:

• Running just with no argument displays the commands defined in justfile, which should cover all usual needs. (Typical usage examples are included throughout this document.)
• just works consistently from anywhere within the project directory.
• No NPM scripts.

Everything should be accessible from the project root, including running commands on a particular component (typically via just <command> <component> ...). We keep things consistent across components, with as much as possible defined just once at the root level; in particular:

• All NPM dependencies are kept in the root package.json
• Only basic properties are kept in each component's package.json

Flowtype transpilation

just compile-(release|dev|watch)

at least once before running the servers or tests, to transpile the source code from Flowtype to pure JS (the compiled code is in dist/).

• just compile-release by default
• just compile-dev to include source maps
• just compile-watch to recompile all files after each saved change. Look out for compilation errors that might prevent the distribution from being updated.

Running service dependencies

The servers and the tests depend on NATS server, MongoDB and InfluxDB.

just start-deps

to get them all running at once.

Testing

⚠️ As of 2022-04, audit tests related to syslog fail on ARM-64 (M1) Macs.

just test <component> [...params]

• component is an existing component's name, or all to run tests on all components
• Extra parameters at the end are passed on to Mocha (default settings are defined in .mocharc.js files)
• Replace test with test-detailed, test-debug, test-cover for common presets

For example:

• just test all to test all components using default settings
• just test-detailed api-server --bail to test component api-server with detailed output, stopping on the first test failure

Useful Mocha parameters

• --bail stops on the first test failure
• --grep <text> only runs tests matching the given text (typically used with test ids, see below)

See Mocha documentation for the full reference.

Controlling console output during tests

With env variables:

• LOGS=<level> to show spawned server instances output (level: info, warn, error)
• DEBUG="*" to show debug information

Test ids tagging

just tag-tests

to tag yet-untagged test cases with a (hopefully) unique id for unambiguous reference. The scripts issues warnings if duplicate ids or programmatically-generated ids are found (as the latter escape the duplicates check). Note as well that the dev-site will fail to build if there are missing ids or duplicates in the generated test results (see below).

Generating test results

just test-results-(init-repo|generate|upload)

Test results are kept in the dev-test-results repository and published on the dev site.

• just test-results-init-repo to checkout the repository locally
• just test-results-generate to run the test suite and save the results to test-results/service-core/${TAG_VERSION}/${TIMESTAMP}-service-core.json
• just test-results-upload to upload the results

Debugging

Add your breakpoints in the compiled code (i.e. in dist/), then just test-debug to run tests in debug mode.

For debugging by hand, old-school:

• Print server 500 errors: uncomment the line containing uncomment to log 500 errors on test running using InstanceManager in …/errorHandling.js
• Print server console.log: uncomment the line with stdio: 'inherit' in …/InstanceManager.js

Miscellaneous tools:

• VSCode extension Source maps navigator helps navigate to the original source code from the compiled one. Use Ctrl/Cmd+click on links.

Tracing

just trace

to start the tracing service (Jaeger).

Data migration

just run api-server migrate

to trigger data migration. Migrations are defined in the storage component.

App Configuration

Components supporting configuration load their settings from (last takes precedence):

1. Default values, as defined in the base configuration or the component's own
2. A JSON file specified by setting config, defaulting to config/{env}.json (env can be production, development or test); typically used for per-environment settings. This variant is deprecated and will be faded out.
3. An additional "overrides" JSON file specified by setting 'configOverrides'; typically used for confidential settings (e.g. keys, secrets). This variant is deprecated and will be faded out.
4. Environment variables; default naming scheme: PRYV_SETTING_KEY_PATH (for example, PRYV_DATABASE_HOST for database→host). This variant is deprecated and will be faded out.
5. Command-line options as --key=value; default naming scheme: setting:key:path (for example, database:host for database→host). This variant is deprecated and will be faded out.

To specify a configuration file, please use --config with a relative or absolute path. This will be the way to configure Pryv.io for the near future.

Those components also accept the following command line options:

• --help displays all available configuration settings as a schema structure (and exits)
• --printConfig prints the configuration settings actually loaded (e.g. for debugging purposes)

Customizing server behaviour

It is possible to extend the API and previews servers with custom code, via the configuration keys defined under customExtensions/:

• defaultFolder: The folder in which custom extension modules are searched for by default. Unless defined by its specific setting (see other settings in customExtensions), each module is loaded from there by its default name (e.g. customAuthStepFn.js), or ignored if missing. Defaults to {app root}/custom-extensions.

• customAuthStepFn: A Node module identifier (e.g. /custom/auth/function.js) implementing a custom auth step (such as authenticating the caller id against an external service). The function is passed the method context, which it can alter, and a callback to be called with either no argument (success) or an error (failure). If this setting is not empty and the specified module cannot be loaded as a function, server startup will fail. Undefined by default.

  // Example of customAuthStepFn.js
  module.exports = function (context, callback) {
    // do whatever is needed here (check LDAP, custom DB, etc.)
    doCustomParsingAndValidating(context, function (err, parsedCallerId) {
      if (err) { return callback(err); }
      context.originalCallerId = context.callerId;
      context.callerId = parsedCallerId;
      callback();
    });
  };

  Available context properties (as of now):

  • username (string)
  • user (object): the user object (properties include id)
  • accessToken (string): as read in the Authorization header or auth parameter
  • callerId (string): optional additional id passed after accessToken in auth after a separating space (auth format is thus <access-token>[ <caller-id>])
  • access (object): the access object (see API doc for structure)

About event types definitions

The default event types definitions (components/business/src/types/event-types.default.json) must be kept up-to-date.

just update-event-types

to fetch them from the "reference" version published online. (The API server also tries to update this asynchronously at startup but fallbacks to the default definitions in the meantime and if the online version is unavailable or corrupted.)

Troubleshooting

Test failures

If you're running into a lot of test failures, it may be because your Mongo database is empty, so try to just test storage first.

If you are getting multiple seemingly unrelated errors following a branch switch, try to just clean then just compile-release.

Docker installation on Linux

If you are trying to run docker <some command> and getting the following error:

docker: Got permission denied while trying to connect to the Docker daemon socket at unix:///var/run/docker.sock: Post http://%2Fvar%2Frun%2Fdocker.sock/v1.26/containers/create: dial unix /var/run/docker.sock: connect: permission denied.
See 'docker run --help'.

You should add the current user to the docker group: sudo usermod -a -G docker $USER

After running this command, in your shell, log out of your account and log back in, reboot if needed. Run docker run hello-world to check if it works.

(Reference)

InfluxDB "too many open files" error

Delete your local influx DB files and reboot Influx DB:

rm ~/.influxdb/data/*
influxd

Or increase the number of authorized files using: ulimit -n 1024 (or more if needed)

License

UNLICENSED