请教关于UniversalRouter的使用

有哪位朋友能否帮忙，给一份使用UniversalRouter实现两个代币间的Swap操作示范吗？

UniversalRouter可以通过universal-router-sdk或自行编写一份合约并部署调用UniversalRouter合约的方式来实现这个交易吗？

0 条评论
分类：Uniswap

默认排序时间排序

1 个回答

fake - 前端开发 2024-07-05 18:38

```js
export const erc20ToErc20 = async (
  chainId: string,
  provider: any,
  planner: RoutePlanner,
  tokenIn: string,
  tokenOut: string,
  amountIn: BigNumber,
  amountOutMin: BigNumber,
  recipient: string,
  level: number,
  swapType: number,
  permit: any,
  signature: string
) => {
  const chainConfig = config[chainId];
  const wethAddress = chainConfig.wethAddress;
  const zeroAddress = chainConfig.zeroAddress;
  const uniswapV2FactoryAddress = chainConfig.uniswapV2FactoryAddress;

const permit2PermitParams = [permit, signature];
  planner.addCommand(CommandType.PERMIT2_PERMIT, permit2PermitParams, false);

const payerIsUser = true;
  const swapParams = [
    recipient,
    amountIn,
    amountOutMin,
    swapPath,
    payerIsUser,
    level,
    swapType,
  ];
  planner.addCommand(CommandType.V2_SWAP_EXACT_IN, swapParams, false);

const sweepParam = [tokenIn, recipient, 0];
  planner.addCommand(CommandType.SWEEP, sweepParam, false);
};
```
可以看看这段代码，返回的是planner编码后UniversalRouter execute函数需要的参数command和inputs, 因为有需要合约有部分编码被我改动了，会和原版代码有点出入，我在这里贴上我们的command表

```js
  V3_SWAP_EXACT_IN = 0x00,
  V3_SWAP_EXACT_OUT = 0x01,
  PERMIT2_TRANSFER_FROM = 0x02,
  PERMIT2_PERMIT_BATCH = 0x03,
  SWEEP = 0x04,
  TRANSFER = 0x05,
  TRANSFER_FROM = 0x06,

V2_SWAP_EXACT_IN = 0x08,
  V2_SWAP_EXACT_OUT = 0x09,
  PERMIT2_PERMIT = 0x0a,
  WRAP_ETH = 0x0b,
  UNWRAP_WETH = 0x0c,
  PERMIT2_TRANSFER_FROM_BATCH = 0x0d,
  BALANCE_CHECK_ERC20 = 0x0e,

EXECUTE_SUB_PLAN = 0x21,
  APPROVE_ERC20 = 0x22,
```

最后这样使用就可以了

```js
tx = await universalRouterWriteContract['execute(bytes,bytes[],uint256)'](
        commands,
        inputs,
        dateTimeStamp,
        {
          value: etherValue,
        }
      );
```