From 278b5eade3a7c1b6bccd22916f1e651139f74f48 Mon Sep 17 00:00:00 2001 From: Thrilok Kumar Date: Sat, 19 Sep 2020 12:16:19 +0530 Subject: [PATCH] Added Swerve connector --- contracts/connectors/swerve.sol | 223 ++++++++++++++++++++++++++++++++ 1 file changed, 223 insertions(+) create mode 100644 contracts/connectors/swerve.sol diff --git a/contracts/connectors/swerve.sol b/contracts/connectors/swerve.sol new file mode 100644 index 0000000..e9b911e --- /dev/null +++ b/contracts/connectors/swerve.sol @@ -0,0 +1,223 @@ +pragma solidity ^0.6.0; + +// import files from common directory +import { TokenInterface , MemoryInterface, EventInterface} from "../common/interfaces.sol"; +import { Stores } from "../common/stores.sol"; +import { DSMath } from "../common/math.sol"; + +interface ISwerve { + function underlying_coins(int128 tokenId) external view returns (address token); + function calc_token_amount(uint256[4] calldata amounts, bool deposit) external returns (uint256 amount); + function add_liquidity(uint256[4] calldata amounts, uint256 min_mint_amount) external; + function get_dy(int128 sellTokenId, int128 buyTokenId, uint256 sellTokenAmt) external returns (uint256 buyTokenAmt); + function exchange(int128 sellTokenId, int128 buyTokenId, uint256 sellTokenAmt, uint256 minBuyToken) external; + function remove_liquidity_imbalance(uint256[4] calldata amounts, uint256 max_burn_amount) external; +} + +interface ISwerveZap { + function calc_withdraw_one_coin(uint256 _token_amount, int128 i) external returns (uint256 amount); +} + + +contract SwerveHelpers is Stores, DSMath { + /** + * @dev Return Swerve Swap Address + */ + function getSwerveSwapAddr() internal pure returns (address) { + return 0x329239599afB305DA0A2eC69c58F8a6697F9F88d; + } + + /** + * @dev Return Swerve Token Address + */ + function getSwerveTokenAddr() internal pure returns (address) { + return 0x77C6E4a580c0dCE4E5c7a17d0bc077188a83A059; + } + + /** + * @dev Return Swerve Zap Address + */ + function getSwerveZapAddr() internal pure returns (address) { + return 0xa746c67eB7915Fa832a4C2076D403D4B68085431; + } + + function convert18ToDec(uint _dec, uint256 _amt) internal pure returns (uint256 amt) { + amt = (_amt / 10 ** (18 - _dec)); + } + + function convertTo18(uint _dec, uint256 _amt) internal pure returns (uint256 amt) { + amt = mul(_amt, 10 ** (18 - _dec)); + } + + function getTokenI(address token) internal pure returns (int128 i) { + if (token == address(0x6B175474E89094C44Da98b954EedeAC495271d0F)) { + // DAI Token + i = 0; + } else if (token == address(0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48)) { + // USDC Token + i = 1; + } else if (token == address(0xdAC17F958D2ee523a2206206994597C13D831ec7)) { + // USDT Token + i = 2; + } else if (token == address(0x0000000000085d4780B73119b644AE5ecd22b376)) { + // TUSD Token + i = 3; + } else { + revert("token-not-found."); + } + } +} + +contract SwerveProtocol is SwerveHelpers { + + event LogSell( + address indexed buyToken, + address indexed sellToken, + uint256 buyAmt, + uint256 sellAmt, + uint256 getId, + uint256 setId + ); + event LogDeposit(address token, uint256 amt, uint256 mintAmt, uint256 getId, uint256 setId); + event LogWithdraw(address token, uint256 amt, uint256 burnAmt, uint256 getId, uint256 setId); + + /** + * @dev Sell Stable ERC20_Token. + * @param buyAddr buying token address. + * @param sellAddr selling token amount. + * @param sellAmt selling token amount. + * @param unitAmt unit amount of buyAmt/sellAmt with slippage. + * @param getId Get token amount at this ID from `InstaMemory` Contract. + * @param setId Set token amount at this ID in `InstaMemory` Contract. + */ + function sell( + address buyAddr, + address sellAddr, + uint sellAmt, + uint unitAmt, + uint getId, + uint setId + ) external payable { + uint _sellAmt = getUint(getId, sellAmt); + ISwerve swerve = ISwerve(getSwerveSwapAddr()); + TokenInterface _buyToken = TokenInterface(buyAddr); + TokenInterface _sellToken = TokenInterface(sellAddr); + _sellAmt = _sellAmt == uint(-1) ? _sellToken.balanceOf(address(this)) : _sellAmt; + _sellToken.approve(address(swerve), _sellAmt); + + uint _slippageAmt = convert18ToDec(_buyToken.decimals(), wmul(unitAmt, convertTo18(_sellToken.decimals(), _sellAmt))); + + uint intialBal = _buyToken.balanceOf(address(this)); + swerve.exchange(getTokenI(sellAddr), getTokenI(buyAddr), _sellAmt, _slippageAmt); + uint finalBal = _buyToken.balanceOf(address(this)); + + uint _buyAmt = sub(finalBal, intialBal); + + setUint(setId, _buyAmt); + + emit LogSell(buyAddr, sellAddr, _buyAmt, _sellAmt, getId, setId); + bytes32 _eventCode = keccak256("LogSell(address,address,uint256,uint256,uint256,uint256)"); + bytes memory _eventParam = abi.encode(buyAddr, sellAddr, _buyAmt, _sellAmt, getId, setId); + emitEvent(_eventCode, _eventParam); + + } + + /** + * @dev Deposit Token. + * @param token token address. + * @param amt token amount. + * @param unitAmt unit amount of swerve_amt/token_amt with slippage. + * @param getId Get token amount at this ID from `InstaMemory` Contract. + * @param setId Set token amount at this ID in `InstaMemory` Contract. + */ + function deposit( + address token, + uint amt, + uint unitAmt, + uint getId, + uint setId + ) external payable { + uint256 _amt = getUint(getId, amt); + TokenInterface tokenContract = TokenInterface(token); + + _amt = _amt == uint(-1) ? tokenContract.balanceOf(address(this)) : _amt; + uint[4] memory _amts; + _amts[uint(getTokenI(token))] = _amt; + + tokenContract.approve(getSwerveSwapAddr(), _amt); + + uint _amt18 = convertTo18(tokenContract.decimals(), _amt); + uint _slippageAmt = wmul(unitAmt, _amt18); + + TokenInterface swerveTokenContract = TokenInterface(getSwerveTokenAddr()); + uint initialSwerveBal = swerveTokenContract.balanceOf(address(this)); + + ISwerve(getSwerveSwapAddr()).add_liquidity(_amts, _slippageAmt); + + uint finalSwerveBal = swerveTokenContract.balanceOf(address(this)); + + uint mintAmt = sub(finalSwerveBal, initialSwerveBal); + + setUint(setId, mintAmt); + + emit LogDeposit(token, _amt, mintAmt, getId, setId); + bytes32 _eventCode = keccak256("LogDeposit(address,uint256,uint256,uint256,uint256)"); + bytes memory _eventParam = abi.encode(token, _amt, mintAmt, getId, setId); + emitEvent(_eventCode, _eventParam); + } + + /** + * @dev Withdraw Token. + * @param token token address. + * @param amt token amount. + * @param unitAmt unit amount of swerve_amt/token_amt with slippage. + * @param getId Get token amount at this ID from `InstaMemory` Contract. + * @param setId Set token amount at this ID in `InstaMemory` Contract. + */ + function withdraw( + address token, + uint256 amt, + uint256 unitAmt, + uint getId, + uint setId + ) external payable { + uint _amt = getUint(getId, amt); + int128 tokenId = getTokenI(token); + + TokenInterface swerveTokenContract = TokenInterface(getSwerveTokenAddr()); + ISwerveZap swerveZap = ISwerveZap(getSwerveZapAddr()); + ISwerve swerveSwap = ISwerve(getSwerveSwapAddr()); + + uint _swerveAmt; + uint[4] memory _amts; + if (_amt == uint(-1)) { + _swerveAmt = swerveTokenContract.balanceOf(address(this)); + _amt = swerveZap.calc_withdraw_one_coin(_swerveAmt, tokenId); + _amts[uint(tokenId)] = _amt; + } else { + _amts[uint(tokenId)] = _amt; + _swerveAmt = swerveSwap.calc_token_amount(_amts, false); + } + + + uint _amt18 = convertTo18(TokenInterface(token).decimals(), _amt); + uint _slippageAmt = wmul(unitAmt, _amt18); + + swerveTokenContract.approve(address(swerveSwap), 0); + swerveTokenContract.approve(address(swerveSwap), _slippageAmt); + + swerveSwap.remove_liquidity_imbalance(_amts, _slippageAmt); + + setUint(setId, _amt); + + emit LogWithdraw(token, _amt, _swerveAmt, getId, setId); + bytes32 _eventCode = keccak256("LogWithdraw(address,uint256,uint256,uint256,uint256)"); + bytes memory _eventParam = abi.encode(token, _amt, _swerveAmt, getId, setId); + emitEvent(_eventCode, _eventParam); + } + +} + +contract ConnectSwerve is SwerveProtocol { + string public name = "Swerve-swUSD-v1.0"; +}