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| // SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;
import '@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol';
import '@uniswap/v2-core/contracts/interfaces/IUniswapV2Callee.sol';
import './interfaces/IUniswapV2Pair.sol';
import './interfaces/IERC20.sol';
contract ExampleFlashSwap is IUniswapV2Callee {
//以下变量修改你部署合约地址
address private constant WETH = 0xc5697643c5d76F7ea252eF911171d9cbbEe359ec;
address private constant USDT = 0xccCDC0B397B2D6fb3717C13738f8865AaC5A2B9C;
address private constant MYTOKEN = 0x7241CBC94A6f76D6eFF7fea6Fd141284338F8e46;
address private constant PAIR = 0xfb85b7DedCFcea3f4fe6894931c0fA75A1ef7844;
address private constant FACTORY = 0xd7330EdCd8665C0369606d2B07E13EBE1f4319c7;
event Log(string message, uint256 val);
//借100USDT
function loanFlashSwap(address _usdtBorrow, uint256 _amount) external {
address token0 = IUniswapV2Pair(PAIR).token0();
address token1 = IUniswapV2Pair(PAIR).token1();
uint256 amount0Out = _usdtBorrow == token0 ? _amount : 0;
uint256 amount1Out = _usdtBorrow == token1 ? _amount : 0;
bytes memory data = abi.encode(_usdtBorrow, _amount);
IUniswapV2Pair(PAIR).swap(amount0Out, amount1Out, address(this), data);
}
function uniswapV2Call(address _sender, uint _amount0, uint _amount1, bytes calldata _data ) external override {
address token0 = IUniswapV2Pair(msg.sender).token0();
address token1 = IUniswapV2Pair(msg.sender).token1();
address pair = IUniswapV2Factory(FACTORY).getPair(token0, token1);
require(msg.sender == pair, "!pair");
require(_sender == address(this), "!sender");
(address usdtBorrow, uint amount) = abi.decode(_data, (address, uint));
// 加上利息 0.3%
uint fee = ((amount * 3) / 997) + 1;
uint amountToRepay = amount + fee;
//执行我们的业务逻辑
emit Log("amount", amount);
emit Log("amount0", _amount0);
emit Log("amount1", _amount1);
emit Log("fee", fee);
emit Log("amount to repay", amountToRepay);
//把借来的Token还回去
IERC20(usdtBorrow).transfer(pair, amountToRepay);
}
receive() external payable {}
}
|
