关于solidity:defi质押lp挖矿dapp系统开发合约部署详情

Uniswap 是去中心化的，不仅跟传统的加密货币交易所不同，也跟一般的去中心化代币交易所不同。Uniswap 是一组部署到以太坊网络的合约，所有的交易都在链上进行。

function addLiquidityETH(

    address token,    uint amountTokenDesired,    uint amountTokenMin,    uint amountETHMin,    address to,    uint deadline

) external virtual override payable ensure(deadline) returns (uint amountToken, uint amountETH, uint liquidity) {

    (amountToken, amountETH) = _addLiquidity(        token,dapp流动性质押挖矿零碎开发卫星：hkkf5566        WETH,        amountTokenDesired,        msg.value,        amountTokenMin,        amountETHMin    );    address pair = UniswapV2Library.pairFor(factory, token, WETH);     //把coin从合约调用者账户转到币对    TransferHelper.safeTransferFrom(token, msg.sender, pair, amountToken);    //把发送的eth兑换成WETH到swap合约    IWETH(WETH).deposit{value: amountETH}();    //swap合约把上一步兑换的weth充值到币对    assert(IWETH(WETH).transfer(pair, amountETH));    //增加流动性    liquidity = IUniswapV2Pair(pair).mint(to);    // 把发送的多于的eth发回给调用者    if (msg.value > amountETH) TransferHelper.safeTransferETH(msg.sender, msg.value - amountETH);}

首先应用修改器做了一次工夫戳校验，传入的工夫戳必须大于以后区块的工夫戳。

modifier ensure(uint deadline) {    require(deadline >= block.timestamp, 'UniswapV2Router: EXPIRED');    _;}

而后调用了_addLiquidity

// **** ADD LIQUIDITY ****function _addLiquidity(    address tokenA,  //yp    address tokenB,  // Weth    uint amountADesired, //yp amount    uint amountBDesired, // msg.value     uint amountAMin, //滑点后    uint amountBMin  //滑点后) internal virtual returns (uint amountA, uint amountB) {    // create the pair if it doesn't exist yet    //创立币对    if (IUniswapV2Factory(factory).getPair(tokenA, tokenB) == address(0)) {        IUniswapV2Factory(factory).createPair(tokenA, tokenB);

        }

    //    (uint reserveA, uint reserveB) = UniswapV2Library.getReserves(factory, tokenA, tokenB);    if (reserveA == 0 && reserveB == 0) {        (amountA, amountB) = (amountADesired, amountBDesired);    } else {        uint amountBOptimal = UniswapV2Library.quote(amountADesired, reserveA, reserveB);        //计算出来的weth数量小于发送的eth数量        if (amountBOptimal <= amountBDesired) {            require(amountBOptimal >= amountBMin, 'UniswapV2Router: INSUFFICIENT_B_AMOUNT');            (amountA, amountB) = (amountADesired, amountBOptimal);        } else {  //大于。            uint amountAOptimal = UniswapV2Library.quote(amountBDesired, reserveB, reserveA);            assert(amountAOptimal <= amountADesired);            require(amountAOptimal >= amountAMin, 'UniswapV2Router: INSUFFICIENT_A_AMOUNT');            (amountA, amountB) = (amountAOptimal, amountBDesired);        }    }}