DeFi 原理: Dex 流通性添加/删除实现

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// SPDX-License-Identifier: MIT pragma solidity ^0.8.13; contract TestUniswapLiquidity { address private constant FACTORY = 0x5C69bEe701ef814a2B6a3EDD4B1652CB9cc5aA6f; address private constant ROUTER = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D; address private constant WETH = 0xc778417E063141139Fce010982780140Aa0cD5Ab; // 添加流动性 function addLiquidity( address _tokenA, address _tokenB, uint _amountA, uint _amountB ) external { // 将 A,B Token 转移到合约地址下 IERC20(_tokenA).transferFrom(msg.sender, address(this), _amountA); IERC20(_tokenB).transferFrom(msg.sender, address(this), _amountB); // 为 Router 地址授权 IERC20(_tokenA).approve(ROUTER, _amountA); IERC20(_tokenB).approve(ROUTER, _amountB); // 添加流动性: 获得结果值 (uint amountA, uint amountB, uint liquidity) = IUniswapV2Router(ROUTER).addLiquidity( _tokenA, _tokenB, _amountA, _amountB, 1, 1, address(this), block.timestamp ); } // 删除流动性 function removeLiquidity(address _tokenA, address _tokenB) external { // 获得交易对池子地址 address pair = IUniswapV2Factory(FACTORY).getPair(_tokenA, _tokenB); // 获得其 LP 数量 uint liquidity = IERC20(pair).balanceOf(address(this)); // 授权给Router IERC20(pair).approve(ROUTER, liquidity); // 删除流动性, 返回结果数量 (uint amountA, uint amountB) = IUniswapV2Router(ROUTER).removeLiquidity( _tokenA, _tokenB, liquidity, 1, 1, address(this), block.timestamp ); } } // v2 router 接口 interface IUniswapV2Router { function addLiquidity( address tokenA, address tokenB, uint amountADesired, uint amountBDesired, uint amountAMin, uint amountBMin, address to, uint deadline ) external returns ( uint amountA, uint amountB, uint liquidity ); function removeLiquidity( address tokenA, address tokenB, uint liquidity, uint amountAMin, uint amountBMin, address to, uint deadline ) external returns (uint amountA, uint amountB); } // v2 工厂接口 interface IUniswapV2Factory { function getPair(address token0, address token1) external view returns (address); } // ERC20 接口 interface IERC20 { function totalSupply() external view returns (uint); function balanceOf(address account) external view returns (uint); function transfer(address recipient, uint amount) external returns (bool); function allowance(address owner, address spender) external view returns (uint); function approve(address spender, uint amount) external returns (bool); function transferFrom( address sender, address recipient, uint amount ) external returns (bool); }

DeFi 原理: Dex 流通性添加/删除实现

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DeFi 开发教程

DeFi 原理: Dex Swap 交易实现

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