MultiCall.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

contract Multicall {
    // Call结构体，包含目标合约target，是否允许调用失败allowFailure，和call data
    struct Call {
        address target;
        bool allowFailure;
        bytes callData;
    }

    // Result结构体，包含调用是否成功和return data
    struct Result {
        bool success;
        bytes returnData;
    }

    /// @notice 将多个调用（支持不同合约/不同方法/不同参数）合并到一次调用
    /// @param calls Call结构体组成的数组
    /// @return returnData Result结构体组成的数组
    function multicall(Call[] calldata calls) public returns (Result[] memory returnData) {
        uint256 length = calls.length;
        returnData = new Result[](length);
        Call calldata calli;
        
        // 在循环中依次调用
        for (uint256 i = 0; i < length; i++) {
            Result memory result = returnData[i];
            calli = calls[i];
            (result.success, result.returnData) = calli.target.call(calli.callData);
            // 如果 calli.allowFailure 和 result.success 均为 false，则 revert
            if (!(calli.allowFailure || result.success)){
                revert("Multicall: call failed");
            }
        }
    }
}