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https://github.com/Instadapp/dsa-connectors-old.git
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Done with uniswap v2 swapping functions
This commit is contained in:
Thrilok Kumar
parent
7da98bfb6d
commit
8ed8852a28
336
contracts/connectors/uniswapV2.sol
Normal file
336
contracts/connectors/uniswapV2.sol
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@ -0,0 +1,336 @@
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pragma solidity ^0.6.0;
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// import files from common directory
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import { TokenInterface , MemoryInterface, EventInterface} from "../common/interfaces.sol";
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import { Stores } from "../common/stores.sol";
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import { DSMath } from "../common/math.sol";
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interface IUniswapV2Router01 {
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function factory() external pure returns (address);
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function WETH() external pure returns (address);
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function addLiquidity(
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address tokenA,
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address tokenB,
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uint amountADesired,
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uint amountBDesired,
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uint amountAMin,
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uint amountBMin,
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address to,
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uint deadline
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) external returns (uint amountA, uint amountB, uint liquidity);
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function addLiquidityETH(
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address token,
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uint amountTokenDesired,
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uint amountTokenMin,
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uint amountETHMin,
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address to,
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uint deadline
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) external payable returns (uint amountToken, uint amountETH, uint liquidity);
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function removeLiquidity(
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address tokenA,
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address tokenB,
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uint liquidity,
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uint amountAMin,
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uint amountBMin,
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address to,
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uint deadline
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) external returns (uint amountA, uint amountB);
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function removeLiquidityETH(
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address token,
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uint liquidity,
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uint amountTokenMin,
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uint amountETHMin,
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address to,
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uint deadline
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) external returns (uint amountToken, uint amountETH);
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function removeLiquidityWithPermit(
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address tokenA,
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address tokenB,
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uint liquidity,
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uint amountAMin,
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uint amountBMin,
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address to,
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uint deadline,
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bool approveMax, uint8 v, bytes32 r, bytes32 s
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) external returns (uint amountA, uint amountB);
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function removeLiquidityETHWithPermit(
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address token,
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uint liquidity,
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uint amountTokenMin,
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uint amountETHMin,
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address to,
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uint deadline,
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bool approveMax, uint8 v, bytes32 r, bytes32 s
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) external returns (uint amountToken, uint amountETH);
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function swapExactTokensForTokens(
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uint amountIn,
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uint amountOutMin,
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address[] calldata path,
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address to,
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uint deadline
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) external returns (uint[] memory amounts);
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function swapTokensForExactTokens(
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uint amountOut,
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uint amountInMax,
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address[] calldata path,
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address to,
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uint deadline
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) external returns (uint[] memory amounts);
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function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline)
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external
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payable
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returns (uint[] memory amounts);
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function swapTokensForExactETH(uint amountOut, uint amountInMax, address[] calldata path, address to, uint deadline)
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external
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returns (uint[] memory amounts);
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function swapExactTokensForETH(uint amountIn, uint amountOutMin, address[] calldata path, address to, uint deadline)
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external
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returns (uint[] memory amounts);
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function swapETHForExactTokens(uint amountOut, address[] calldata path, address to, uint deadline)
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external
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payable
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returns (uint[] memory amounts);
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function quote(uint amountA, uint reserveA, uint reserveB) external pure returns (uint amountB);
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function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) external pure returns (uint amountOut);
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function getAmountIn(uint amountOut, uint reserveIn, uint reserveOut) external pure returns (uint amountIn);
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function getAmountsOut(uint amountIn, address[] calldata path) external view returns (uint[] memory amounts);
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function getAmountsIn(uint amountOut, address[] calldata path) external view returns (uint[] memory amounts);
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}
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interface IUniswapV2Factory {
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function getPair(address tokenA, address tokenB) external view returns (address pair);
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function allPairs(uint) external view returns (address pair);
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function allPairsLength() external view returns (uint);
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function feeTo() external view returns (address);
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function feeToSetter() external view returns (address);
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function createPair(address tokenA, address tokenB) external returns (address pair);
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}
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contract UniswapHelpers is Stores, DSMath {
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/**
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* @dev Return WETH address
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*/
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function getAddressWETH() internal pure returns (address) {
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return 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
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}
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/**
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* @dev Return uniswap v2 router Address
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*/
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function getUniswapAddr() internal pure returns (address) {
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return 0x794e6e91555438aFc3ccF1c5076A74F42133d08D;
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}
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function convert18ToDec(uint _dec, uint256 _amt) internal pure returns (uint256 amt) {
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amt = (_amt / 10 ** (18 - _dec));
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}
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function convertTo18(uint _dec, uint256 _amt) internal pure returns (uint256 amt) {
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amt = mul(_amt, 10 ** (18 - _dec));
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}
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function changeEthAddress(address buy, address sell) internal pure returns(TokenInterface _buy, TokenInterface _sell){
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_buy = buy == getEthAddr() ? TokenInterface(getAddressWETH()) : TokenInterface(buy);
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_sell = sell == getEthAddr() ? TokenInterface(getAddressWETH()) : TokenInterface(sell);
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}
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function convertEthToWeth(TokenInterface token, uint amount) internal {
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if(address(token) == getAddressWETH()) token.deposit.value(amount)();
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}
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function convertWethToEth(TokenInterface token, uint amount) internal {
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if(address(token) == getAddressWETH()) {
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token.approve(getAddressWETH(), amount);
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token.withdraw(amount);
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}
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}
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function getExpectedBuyAmt(
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IUniswapV2Router01 router,
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address[] memory paths,
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uint sellAmt
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) internal view returns(uint buyAmt) {
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uint[] memory amts = router.getAmountsOut(
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sellAmt,
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paths
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);
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buyAmt = amts[1];
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}
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function getExpectedSellAmt(
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IUniswapV2Router01 router,
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address[] memory paths,
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uint buyAmt
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) internal view returns(uint sellAmt) {
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uint[] memory amts = router.getAmountsOut(
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buyAmt,
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paths
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);
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sellAmt = amts[1];
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}
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function checkPair(
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IUniswapV2Router01 router,
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address[] memory paths
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) internal view {
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address pair = IUniswapV2Factory(router.factory()).getPair(paths[0], paths[1]);
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require(pair != address(0), "No-exchange-address");
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}
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function getPaths(
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address sellAddr,
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address buyAddr
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) internal view returns(address[] memory paths) {
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paths = new address[](2);
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paths[0] = address(sellAddr);
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paths[1] = address(buyAddr);
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}
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}
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contract UniswapResolver is UniswapHelpers {
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event LogBuy(
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address indexed buyToken,
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address indexed sellToken,
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uint256 buyAmt,
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uint256 sellAmt,
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uint256 getId,
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uint256 setId
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);
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event LogSell(
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address indexed buyToken,
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address indexed sellToken,
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uint256 buyAmt,
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uint256 sellAmt,
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uint256 getId,
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uint256 setId
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);
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/**
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* @dev Buy ETH/ERC20_Token.
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* @param buyAddr buying token address.(For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
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* @param sellAddr selling token amount.(For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
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* @param buyAmt buying token amount.
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* @param unitAmt unit amount of sellAmt/buyAmt with slippage.
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* @param getId Get token amount at this ID from `InstaMemory` Contract.
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* @param setId Set token amount at this ID in `InstaMemory` Contract.
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*/
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function buy(
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address buyAddr,
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address sellAddr,
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uint buyAmt,
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uint unitAmt,
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uint getId,
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uint setId
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) external payable {
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// swapTokensForExactTokens
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uint _buyAmt = getUint(getId, buyAmt);
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(TokenInterface _buyAddr, TokenInterface _sellAddr) = changeEthAddress(buyAddr, sellAddr);
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address[] memory paths = getPaths(address(_buyAddr), address(_sellAddr));
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uint __buyAmt18 = convertTo18(_buyAddr.decimals(), _buyAmt);
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uint _slippageAmt = convert18ToDec(_sellAddr.decimals(), wmul(unitAmt, __buyAmt18));
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IUniswapV2Router01 router = IUniswapV2Router01(getUniswapAddr());
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checkPair(router, paths);
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uint _expectedAmt = getExpectedSellAmt(router, paths, _buyAmt);
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require(_slippageAmt >= _expectedAmt, "Too much slippage");
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convertEthToWeth(_sellAddr, _expectedAmt);
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_sellAddr.approve(address(router), _expectedAmt);
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uint[] memory _amts = router.swapTokensForExactTokens(
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_buyAmt,
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_expectedAmt,
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paths,
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address(this),
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now + 6 hours // TODO - deadline?
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);
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uint _sellAmt = _amts[0];
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convertWethToEth(_buyAddr, _buyAmt);
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setUint(setId, _sellAmt);
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emit LogBuy(buyAddr, sellAddr, _buyAmt, _sellAmt, getId, setId);
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bytes32 _eventCode = keccak256("LogBuy(address,address,uint256,uint256,uint256,uint256)");
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bytes memory _eventParam = abi.encode(buyAddr, sellAddr, _buyAmt, _sellAmt, getId, setId);
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(uint _type, uint _id) = connectorID();
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EventInterface(getEventAddr()).emitEvent(_type, _id, _eventCode, _eventParam);
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}
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/**
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* @dev Sell ETH/ERC20_Token.
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* @param buyAddr buying token address.(For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
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* @param sellAddr selling token amount.(For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
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* @param sellAmt selling token amount.
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* @param unitAmt unit amount of buyAmt/sellAmt with slippage.
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* @param getId Get token amount at this ID from `InstaMemory` Contract.
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* @param setId Set token amount at this ID in `InstaMemory` Contract.
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*/
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function sell(
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address buyAddr,
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address sellAddr,
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uint sellAmt,
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uint unitAmt,
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uint getId,
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uint setId
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) external payable {
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// /swapExactTokensForTokens/
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uint _sellAmt = getUint(getId, sellAmt);
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(TokenInterface _buyAddr, TokenInterface _sellAddr) = changeEthAddress(buyAddr, sellAddr);
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address[] memory paths = getPaths(address(_buyAddr), address(_sellAddr));
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if (_sellAmt == uint(-1)) {
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_sellAmt = sellAddr == getEthAddr() ? address(this).balance : _buyAddr.balanceOf(address(this));
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}
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uint _sellAmt18 = convertTo18(_sellAddr.decimals(), _sellAmt);
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uint _slippageAmt = convert18ToDec(_buyAddr.decimals(), wmul(unitAmt, _sellAmt18));
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IUniswapV2Router01 router = IUniswapV2Router01(getUniswapAddr());
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checkPair(router, paths);
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uint _expectedAmt = getExpectedBuyAmt(router, paths, _sellAmt);
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require(_slippageAmt >= _expectedAmt, "Too much slippage");
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convertEthToWeth(_sellAddr, _sellAmt);
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_sellAddr.approve(address(router), _sellAmt);
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uint[] memory _amts = router.swapExactTokensForTokens(
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_sellAmt,
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_expectedAmt,
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paths,
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address(this),
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now + 6 hours // TODO - deadline?
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);
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uint _buyAmt = _amts[1];
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convertWethToEth(_buyAddr, _buyAmt);
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setUint(setId, _buyAmt);
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emit LogSell(buyAddr, sellAddr, _buyAmt, _sellAmt, getId, setId);
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bytes32 _eventCode = keccak256("LogSell(address,address,uint256,uint256,uint256,uint256)");
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bytes memory _eventParam = abi.encode(buyAddr, sellAddr, _buyAmt, _sellAmt, getId, setId);
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(uint _type, uint _id) = connectorID();
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EventInterface(getEventAddr()).emitEvent(_type, _id, _eventCode, _eventParam);
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}
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}
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contract ConnectUniswapV2 is UniswapResolver {
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string public name = "UniswapV2-v1";
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}
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