Hardhat以太坊主网分叉AAVE多代币闪电贷报错求助

问题概述 #

在 Hardhat 框架下开发 AAVE 闪电贷功能，运行环境为以太坊主网分叉（eth mainnet-fork）：

• 仅借入单种代币时功能可正常执行
• 借入代币数量大于1种时始终触发报错

单代币借入（运行成功）场景代码 #

测试脚本 flash-loans-test.js #

const { ethers } = require("hardhat");
const hre = require("hardhat");

describe("AaveFlashLoans", function () {
    it("Excute flashloans", async function () {
        const contractAddress = "0xB53C1a33016B2DC2fF3653530bfF1848a515c8c5";
        const flashLoansFactory = await ethers.getContractFactory("AaveFlashLoans");
        const flashLoans = await flashLoansFactory.deploy(contractAddress);
        await flashLoans.deployed();

        const token = await ethers.getContractAt("IERC20", "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2"); //weth

        const BALANCE_AMOUNT = ethers.utils.parseEther("2");

        await hre.network.provider.request({
            method: "hardhat_impersonateAccount",
            params: ["0xf07704777d6bc182bf2c67fbda48913169b84983"],
        });

        const signer = await ethers.getSigner("0xf07704777d6bc182bf2c67fbda48913169b84983");

        await token
            .connect(signer)
            .transfer(flashLoans.address, BALANCE_AMOUNT);

        await flashLoans.myFlashLoanCall();

        const balance = await token.balanceOf(flashLoans.address)

        console.log(balance);
    });
});

合约代码 AaveFlashLoans.sol #

pragma solidity ^0.8.0;

import {SafeMath} from "@openzeppelin/contracts/utils/math/SafeMath.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {FlashLoanReceiverBase} from "./FlashLoanReceiverBase.sol";
import {ILendingPoolAddressesProvider} from "./ILendingPoolAddressesProvider.sol";
import "hardhat/console.sol";

contract AaveFlashLoans is FlashLoanReceiverBase {
    using SafeMath for uint256;

    constructor(ILendingPoolAddressesProvider _addressProvider)
        FlashLoanReceiverBase(_addressProvider)
    {}

    function executeOperation(
        address[] calldata assets,
        uint256[] calldata amounts,
        uint256[] calldata premiums,
        address,
        bytes calldata
    ) external override returns (bool) {
        for (uint256 i = 0; i < assets.length; i++) {
            uint256 amountOwing = amounts[i].add(premiums[i]);
            IERC20(assets[i]).approve(address(LENDING_POOL), amountOwing);
            console.log(amounts[i]);
            console.log(premiums[i]);
        }

        return true;
    }

    function myFlashLoanCall() public {
        address receiverAddress = address(this);

        address[] memory assets = new address[](1);
        assets[0] = address(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2); // weth

        uint256[] memory amounts = new uint256[](1);
        amounts[0] = 1 ether;

        uint256[] memory modes = new uint256[](1);
        modes[0] = 0;

        address onBehalfOf = address(this);
        bytes memory params = "";
        uint16 referralCode = 0;

        LENDING_POOL.flashLoan(
            receiverAddress,
            assets,
            amounts,
            modes,
            onBehalfOf,
            params,
            referralCode
        );
    }
}

单代币场景运行成功，对应运行截图：

• 单代币运行成功截图1
• 单代币运行成功截图2

多代币借入（运行报错）场景代码 #

新增第二种借入代币USDT后，代码执行始终报错，修改后的 AaveFlashLoans.sol 代码如下：

pragma solidity ^0.8.0;

import {SafeMath} from "@openzeppelin/contracts/utils/math/SafeMath.sol";
import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import {FlashLoanReceiverBase} from "./FlashLoanReceiverBase.sol";
import {ILendingPoolAddressesProvider} from "./ILendingPoolAddressesProvider.sol";
import "hardhat/console.sol";

contract AaveFlashLoans is FlashLoanReceiverBase {
    using SafeMath for uint256;

    constructor(ILendingPoolAddressesProvider _addressProvider)
        FlashLoanReceiverBase(_addressProvider)
    {}

    function executeOperation(
        address[] calldata assets,
        uint256[] calldata amounts,
        uint256[] calldata premiums,
        address,
        bytes calldata
    ) external override returns (bool) {
        for (uint256 i = 0; i < assets.length; i++) {
            uint256 amountOwing = amounts[i].add(premiums[i]);
            IERC20(assets[i]).approve(address(LENDING_POOL), amountOwing);
            console.log(amounts[i]);
            console.log(premiums[i]);
        }

        return true;
    }

    function myFlashLoanCall() public {
        address receiverAddress = address(this);

        address[] memory assets = new address[](2);
        assets[0] = address(0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2); // weth
        assets[1] = address(0xdAC17F958D2ee523a2206206994597C13D831ec7); // usdt

        uint256[] memory amounts = new uint256[](2);
        amounts[0] = 1 ether;
        amounts[1] = 1 ether;

        uint256[] memory modes = new uint256[](2);
        modes[0] = 0;
        modes[1] = 0;

        address onBehalfOf = address(this);
        bytes memory params = "";
        uint16 referralCode = 0;

        LENDING_POOL.flashLoan(
            receiverAddress,
            assets,
            amounts,
            modes,
            onBehalfOf,
            params,
            referralCode
        );
    }
}

多代币场景运行报错，对应报错截图：

• 多代币场景报错截图

恳请各位技术同仁协助排查问题原因，非常感谢。

内容的提问来源于stack exchange，提问作者Ignacio