错误:事务恢复:函数返回意外数量的数据，Pancakeswap

Question

我真的需要你的帮助，因为我被困在这一周了。实际上，我在煎饼饼上实现了一个交换函数，我正在跟踪这个文档。我正在做swapEthForExactTokens，但是得到了一个我不明白的错误。我写的函数..。

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.11;

import "@theanthill/pancake-swap-periphery/contracts/interfaces/IPancakeRouter01.sol";
import "@theanthill/pancake-swap-periphery/contracts/interfaces/IERC20.sol";

contract Pancakeswap {
    address internal constant PANCAKESWAP_ROUTER_ADDRESS = 0x10ED43C718714eb63d5aA57B78B54704E256024E;
    address internal constant PANCAKE_FACTORY_ADDRESS = 0xcA143Ce32Fe78f1f7019d7d551a6402fC5350c73;

    address internal constant BTCB = 0x7130d2A12B9BCbFAe4f2634d864A1Ee1Ce3Ead9c;
    address private constant WETH = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2;
    address private constant WBNB = 0xbb4CdB9CBd36B01bD1cBaEBF2De08d9173bc095c;

    IPancakeRouter01 public pancakeswapRouter;

    constructor() {
        pancakeswapRouter = IPancakeRouter01(PANCAKESWAP_ROUTER_ADDRESS);
    }

    function getPath(address arg0, address arg1) public pure returns (address[] memory) {
        address[] memory path = new address[](2);
        path[0] = arg0;
        path[1] = arg1;
        return path;
    }

    function swappingETHForExactTokens(uint256 amountOut, address tokenOut) public payable returns (uint256[] memory) {
        uint256 deadline = block.timestamp + 15;
        uint256[] memory swappedAmounts = pancakeswapRouter.swapETHForExactTokens{
          value: msg.value}(amountOut, getPath(WETH, tokenOut), address(this), deadline);

        (bool success, ) = msg.sender.call{ value: address(this).balance }("");
        require(success, "refund failed");
        return swappedAmounts;
    }
}

当涉及到单元测试时，我使用的是类型记录，如下所示。

export function shouldBehaveLikePancakeswap(): void {
  const AMOUNT_OUT = 10;
  const AMOUNT_IN = 100;
  const WHALE = process.env.WETH_WHALE;
  const DAI = process.env.DAI;
  const WBTC = process.env.WBTC;
  const TOKEN_OUT = DAI;
  const expectedSwapAmount = "557227237267357629";

  let TestPancakeswap;
  let pancakeswap;
  let receiver: { address: any };
  let other;

  it("should swap eth for exact tokens", async function () {
    [other, receiver] = await ethers.getSigners();
    TestPancakeswap = await ethers.getContractFactory("Pancakeswap");
    pancakeswap = await TestPancakeswap.deploy();

    const amounts = await pancakeswap.swappingETHForExactTokens(AMOUNT_OUT, TOKEN_OUT, {value: expectedSwapAmount});
    console.log(`amounts of token received ${amounts}`);
  });
}

最后，从主测试文件调用shouldBehaveLikePancakeswap()。我是在像下面这样在硬帽子上分叉主干网之后运行这些的.

hardhat.config.ts

networks: {
    develop: {
      url: "http://127.0.0.1:8545",
      timeout: 200000,
      allowUnlimitedContractSize: true,
    },
    hardhat: {
      forking: {
        url: "https://eth-mainnet.alchemyapi.io/v2/$MY_ALCHEMY_ID",
        blockNumber: 14389000,
      },
      accounts: {
        mnemonic,
      },
      chainId: chainIds.hardhat,
    },

然后，使用命令：yarn test --network hardhat我正在运行，作为回报，得到这个错误.

1) Unit tests
       Pancakeswap
         should swap eth for exact tokens:
     Error: Transaction reverted: function returned an unexpected amount of data
    at Pancakeswap.getEstimatedEthForTokens (contracts/Pancakeswap.sol:36)
    at Pancakeswap.swappingETHForExactTokens (contracts/Pancakeswap.sol:40)
    at async HardhatNode._mineBlockWithPendingTxs (node_modules/hardhat/src/internal/hardhat-network/provider/node.ts:1772:23)
    at async HardhatNode.mineBlock (node_modules/hardhat/src/internal/hardhat-network/provider/node.ts:466:16)
    at async EthModule._sendTransactionAndReturnHash (node_modules/hardhat/src/internal/hardhat-network/provider/modules/eth.ts:1496:18)
    at async HardhatNetworkProvider.request (node_modules/hardhat/src/internal/hardhat-network/provider/provider.ts:118:18)
    at async EthersProviderWrapper.send (node_modules/@nomiclabs/hardhat-ethers/src/internal/ethers-provider-wrapper.ts:13:20)

前两行的错误是，我得到了行的错误.

uint256[] memory swappedAmounts = pancakeswapRouter.swapETHForExactTokens{
          value: ethAmountDeriveable}(amountOut, getPath(WETH, tokenOut), address(this), deadline);

Answer 1

在我的程序中，当我移除hardhat.config文件中的‘hardhat.config’语句时，程序工作。我不知道为什么。