update defi development

defi-development-mastery/1-defi-building-blocks/10-liquidity-mining/contracts/BonusToken.sol

@@ -0,0 +1,12 @@
+pragma solidity ^0.7.2;
+
+import '@openzeppelin/contracts/token/ERC20/ERC20.sol';
+import '@openzeppelin/contracts/access/Ownable.sol';
+
+contract BonusToken is ERC20, Ownable {
+  constructor() ERC20('Bonus Token', 'BTK') Ownable() {} 
+
+  function mint(address to, uint amount) external onlyOwner() {
+    _mint(to, amount);
+  }
+}

defi-development-mastery/1-defi-building-blocks/10-liquidity-mining/contracts/LiquidityMining.sol

@@ -0,0 +1,50 @@
+pragma solidity ^0.7.2;
+
+import './LpToken.sol';
+import './BonusToken.sol';
+
+contract LiquidityMining {
+  struct User {
+    uint balance;
+    uint checkpoint;
+  }
+  mapping(address => User) public users;
+  uint public totalBalance;
+  uint public checkpoint;
+  uint constant public BONUS_PER_BLOCK = 1000;
+  LpToken public lpToken;
+  BonusToken public bonusToken;
+
+  constructor(address _lpToken, address _bonusToken) {
+    lpToken = LpToken(_lpToken);
+    bonusToken = BonusToken(_bonusToken);
+  }
+
+  function deposit(uint amount) external {
+    User storage user = users[msg.sender]; 
+    _updateBonusTokens(user);
+    lpToken.transferFrom(msg.sender, address(this), amount);
+    user.balance += amount;
+    totalBalance += amount;
+  }
+
+  function withdraw(uint amount) external {
+    User storage user = users[msg.sender]; 
+    _updateBonusTokens(user);
+    lpToken.transfer(msg.sender, amount);
+    user.balance -= amount;
+    totalBalance -= amount;
+  }
+
+  function _updateBonusTokens(User storage user) internal {
+    uint mintableBonusTokens = (block.number - checkpoint) * BONUS_PER_BLOCK;
+    if(block.number > checkpoint) {
+      bonusToken.mint(address(this), mintableBonusTokens);
+      checkpoint = block.number;
+    }
+    if(block.number > user.checkpoint) {
+      bonusToken.transfer(msg.sender, mintableBonusTokens * user.balance / totalBalance);
+      user.checkpoint = block.number;
+    }
+  }
+}

defi-development-mastery/1-defi-building-blocks/10-liquidity-mining/contracts/LpToken.sol

@@ -0,0 +1,7 @@
+pragma solidity ^0.7.2;
+
+import '@openzeppelin/contracts/token/ERC20/ERC20.sol';
+
+contract LpToken is ERC20 {
+  constructor() ERC20('Lp Token', 'LTK') {} 
+}

defi-development-mastery/1-defi-building-blocks/10-liquidity-mining/migrations/2_deploy_contracts.js

@@ -0,0 +1,15 @@
+const LpToken = artifacts.require('LpToken.sol');
+const BonusToken = artifacts.require('BonusToken.sol');
+const LiquidityMining = artifacts.require('LiquidityMining.sol');
+
+module.exports = async function (deployer) {
+  await deployer.deploy(LpToken);
+  const lpToken = await LpToken.deployed();
+
+  await deployer.deploy(BonusToken);
+  const bonusToken = await BonusToken.deployed();
+
+  await deployer.deploy(LiquidityMining, lpToken.address, bonusToken.address);
+  const liquidityMining = await LiquidityMining.deployed();
+  await bonusToken.transferOwnership(liquidityMining.address);
+};

defi-development-mastery/1-defi-building-blocks/10-liquidity-mining/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "yield-farming",
+  "version": "1.0.0",
+  "main": "truffle-config.js",
+  "directories": {
+    "test": "test"
+  },
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "description": "",
+  "dependencies": {
+    "@openzeppelin/contracts": "^3.2.1-solc-0.7"
+  }
+}

defi-development-mastery/1-defi-building-blocks/10-liquidity-mining/truffle-config.js

@@ -0,0 +1,96 @@
+/**
+ * Use this file to configure your truffle project. It's seeded with some
+ * common settings for different networks and features like migrations,
+ * compilation and testing. Uncomment the ones you need or modify
+ * them to suit your project as necessary.
+ *
+ * More information about configuration can be found at:
+ *
+ * trufflesuite.com/docs/advanced/configuration
+ *
+ * To deploy via Infura you'll need a wallet provider (like @truffle/hdwallet-provider)
+ * to sign your transactions before they're sent to a remote public node. Infura accounts
+ * are available for free at: infura.io/register.
+ *
+ * You'll also need a mnemonic - the twelve word phrase the wallet uses to generate
+ * public/private key pairs. If you're publishing your code to GitHub make sure you load this
+ * phrase from a file you've .gitignored so it doesn't accidentally become public.
+ *
+ */
+
+// const HDWalletProvider = require('@truffle/hdwallet-provider');
+// const infuraKey = "fj4jll3k.....";
+//
+// const fs = require('fs');
+// const mnemonic = fs.readFileSync(".secret").toString().trim();
+
+module.exports = {
+  /**
+   * Networks define how you connect to your ethereum client and let you set the
+   * defaults web3 uses to send transactions. If you don't specify one truffle
+   * will spin up a development blockchain for you on port 9545 when you
+   * run `develop` or `test`. You can ask a truffle command to use a specific
+   * network from the command line, e.g
+   *
+   * $ truffle test --network <network-name>
+   */
+
+  networks: {
+    // Useful for testing. The `development` name is special - truffle uses it by default
+    // if it's defined here and no other network is specified at the command line.
+    // You should run a client (like ganache-cli, geth or parity) in a separate terminal
+    // tab if you use this network and you must also set the `host`, `port` and `network_id`
+    // options below to some value.
+    //
+    // development: {
+    //  host: "127.0.0.1",     // Localhost (default: none)
+    //  port: 8545,            // Standard Ethereum port (default: none)
+    //  network_id: "*",       // Any network (default: none)
+    // },
+    // Another network with more advanced options...
+    // advanced: {
+    // port: 8777,             // Custom port
+    // network_id: 1342,       // Custom network
+    // gas: 8500000,           // Gas sent with each transaction (default: ~6700000)
+    // gasPrice: 20000000000,  // 20 gwei (in wei) (default: 100 gwei)
+    // from: <address>,        // Account to send txs from (default: accounts[0])
+    // websockets: true        // Enable EventEmitter interface for web3 (default: false)
+    // },
+    // Useful for deploying to a public network.
+    // NB: It's important to wrap the provider as a function.
+    // ropsten: {
+    // provider: () => new HDWalletProvider(mnemonic, `https://ropsten.infura.io/v3/YOUR-PROJECT-ID`),
+    // network_id: 3,       // Ropsten's id
+    // gas: 5500000,        // Ropsten has a lower block limit than mainnet
+    // confirmations: 2,    // # of confs to wait between deployments. (default: 0)
+    // timeoutBlocks: 200,  // # of blocks before a deployment times out  (minimum/default: 50)
+    // skipDryRun: true     // Skip dry run before migrations? (default: false for public nets )
+    // },
+    // Useful for private networks
+    // private: {
+    // provider: () => new HDWalletProvider(mnemonic, `https://network.io`),
+    // network_id: 2111,   // This network is yours, in the cloud.
+    // production: true    // Treats this network as if it was a public net. (default: false)
+    // }
+  },
+
+  // Set default mocha options here, use special reporters etc.
+  mocha: {
+    // timeout: 100000
+  },
+
+  // Configure your compilers
+  compilers: {
+    solc: {
+      version: "0.7.2",    // Fetch exact version from solc-bin (default: truffle's version)
+      // docker: true,        // Use "0.5.1" you've installed locally with docker (default: false)
+      // settings: {          // See the solidity docs for advice about optimization and evmVersion
+      //  optimizer: {
+      //    enabled: false,
+      //    runs: 200
+      //  },
+      //  evmVersion: "byzantium"
+      // }
+    },
+  },
+};

defi-development-mastery/1-defi-building-blocks/11-yield-farming/contracts/YieldFarmer.sol

@@ -0,0 +1,23 @@
+pragma solidity ^0.7.2;
+
+contract YieldFarmer {
+  function rebalance() external {
+    uint yieldA = pricer.getYieldA();
+    uint yieldB = pricer.getYieldB();
+    uint yieldC = pricer.getYieldC();
+    if(yieldA >= yieldB && yieldA >= yieldC) {
+
+    }
+    if(yieldB >= yieldA && yieldB >= yieldC) {
+    }
+    if(yieldC >= yieldA && yieldC >= yieldB) {
+    }
+  }
+
+  function getYieldA() public view returns(uint) {
+  }
+  function getYieldB() public view returns(uint) {
+  }
+  function getYieldC() public view returns(uint) {
+  }
+}

defi-development-mastery/1-defi-building-blocks/11-yield-farming/truffle-config.js

@@ -0,0 +1,96 @@
+/**
+ * Use this file to configure your truffle project. It's seeded with some
+ * common settings for different networks and features like migrations,
+ * compilation and testing. Uncomment the ones you need or modify
+ * them to suit your project as necessary.
+ *
+ * More information about configuration can be found at:
+ *
+ * trufflesuite.com/docs/advanced/configuration
+ *
+ * To deploy via Infura you'll need a wallet provider (like @truffle/hdwallet-provider)
+ * to sign your transactions before they're sent to a remote public node. Infura accounts
+ * are available for free at: infura.io/register.
+ *
+ * You'll also need a mnemonic - the twelve word phrase the wallet uses to generate
+ * public/private key pairs. If you're publishing your code to GitHub make sure you load this
+ * phrase from a file you've .gitignored so it doesn't accidentally become public.
+ *
+ */
+
+// const HDWalletProvider = require('@truffle/hdwallet-provider');
+// const infuraKey = "fj4jll3k.....";
+//
+// const fs = require('fs');
+// const mnemonic = fs.readFileSync(".secret").toString().trim();
+
+module.exports = {
+  /**
+   * Networks define how you connect to your ethereum client and let you set the
+   * defaults web3 uses to send transactions. If you don't specify one truffle
+   * will spin up a development blockchain for you on port 9545 when you
+   * run `develop` or `test`. You can ask a truffle command to use a specific
+   * network from the command line, e.g
+   *
+   * $ truffle test --network <network-name>
+   */
+
+  networks: {
+    // Useful for testing. The `development` name is special - truffle uses it by default
+    // if it's defined here and no other network is specified at the command line.
+    // You should run a client (like ganache-cli, geth or parity) in a separate terminal
+    // tab if you use this network and you must also set the `host`, `port` and `network_id`
+    // options below to some value.
+    //
+    // development: {
+    //  host: "127.0.0.1",     // Localhost (default: none)
+    //  port: 8545,            // Standard Ethereum port (default: none)
+    //  network_id: "*",       // Any network (default: none)
+    // },
+    // Another network with more advanced options...
+    // advanced: {
+    // port: 8777,             // Custom port
+    // network_id: 1342,       // Custom network
+    // gas: 8500000,           // Gas sent with each transaction (default: ~6700000)
+    // gasPrice: 20000000000,  // 20 gwei (in wei) (default: 100 gwei)
+    // from: <address>,        // Account to send txs from (default: accounts[0])
+    // websockets: true        // Enable EventEmitter interface for web3 (default: false)
+    // },
+    // Useful for deploying to a public network.
+    // NB: It's important to wrap the provider as a function.
+    // ropsten: {
+    // provider: () => new HDWalletProvider(mnemonic, `https://ropsten.infura.io/v3/YOUR-PROJECT-ID`),
+    // network_id: 3,       // Ropsten's id
+    // gas: 5500000,        // Ropsten has a lower block limit than mainnet
+    // confirmations: 2,    // # of confs to wait between deployments. (default: 0)
+    // timeoutBlocks: 200,  // # of blocks before a deployment times out  (minimum/default: 50)
+    // skipDryRun: true     // Skip dry run before migrations? (default: false for public nets )
+    // },
+    // Useful for private networks
+    // private: {
+    // provider: () => new HDWalletProvider(mnemonic, `https://network.io`),
+    // network_id: 2111,   // This network is yours, in the cloud.
+    // production: true    // Treats this network as if it was a public net. (default: false)
+    // }
+  },
+
+  // Set default mocha options here, use special reporters etc.
+  mocha: {
+    // timeout: 100000
+  },
+
+  // Configure your compilers
+  compilers: {
+    solc: {
+      version: "0.7.2",    // Fetch exact version from solc-bin (default: truffle's version)
+      // docker: true,        // Use "0.5.1" you've installed locally with docker (default: false)
+      // settings: {          // See the solidity docs for advice about optimization and evmVersion
+      //  optimizer: {
+      //    enabled: false,
+      //    runs: 200
+      //  },
+      //  evmVersion: "byzantium"
+      // }
+    },
+  },
+};

defi-development-mastery/1-defi-building-blocks/12-flashloans/contracts/ExampleFlashloanCallee.sol

@@ -0,0 +1,34 @@
+pragma solidity ^0.7.2;
+
+import '@openzeppelin/contracts/token/ERC20/IERC20.sol';
+import './Flashloan.sol';
+import './IFlashloanCallee.sol';
+
+contract ExampleFlashloanCallee is IFlashloanCallee {
+  function startFlashloan(
+    address flashloan, 
+    uint amount, 
+    address token
+  ) 
+    external 
+  {
+    Flashloan(flashloan).executeFlashloan(
+      address(this), 
+      amount, 
+      token, 
+      bytes('')
+    );
+  }
+
+  function flashloanCallback(
+    uint amount, 
+    address token, 
+    bytes memory data
+  ) 
+    override
+    external 
+  {
+    //do some arbitrage, liquidation, etc..
+    IERC20(token).transfer(msg.sender, amount);
+  }
+}