如何解码匿名事件？答案

【问题标题】：how do I decode an anonymous event?如何解码匿名事件？
【发布时间】：2022-10-21 21:22:08
【问题描述】：

我正在尝试解码我在合同中写的一个简单的匿名事件，而不是结果我得到一个空数组，有人知道我做错了什么吗？

我正在使用安全帽。

合同：

pragma solidity ^0.8.9;
contract Lock {

   event DataStored(address admin, uint256 indexed data) anonymous;
   uint256 data;
   function storeData(uint256 data) external {
      data = data;
      emit DataStored(msg.sender, data);

   }
}

部署.js

const hre = require("hardhat");
const contract = require("../artifacts/contracts/Lock.sol/Lock.json");
const abiDecoder = require('abi-decoder');

async function main() {
  

  const Lock = await hre.ethers.getContractFactory("Lock");
  const lock = await Lock.deploy();

  await lock.deployed();

  console.log(
    ` deployed to ${lock.address}`
  );
  tx = await lock.storeData(10);
  const transactionReceipt = await tx.wait()
  abiDecoder.addABI(contract.abi);
  const decodedLogs = abiDecoder.decodeLogs(transactionReceipt.events);
  console.log(transactionReceipt.events)
  console.log(decodedLogs);


}
main().catch((error) => {
  console.error(error);
  process.exitCode = 1;
});

以及我从运行 deploy.js 中得到的结果

deployed to 0x21dF544947ba3E8b3c32561399E88B52Dc8b2823
[]

【问题讨论】：

标签： events solidity smartcontracts hardhat

【解决方案1】：

所以我认为你应该尝试通过这个例子来了解非匿名和匿名事件之间的区别

智能合约：

pragma solidity ^0.8.9;

contract Lock {

    event DataStoredNonAnonymous(address admin, uint256 indexed data);
    event DataStoredAnonymous(address admin, uint256 indexed data) anonymous;
   
    uint256 x;
    uint256 y;
   
    function storeDataNonAnonymous(uint256 _data) external {
      x = _data;
      emit DataStoredNonAnonymous(msg.sender, _data);
    }

    function storeDataAnonymous(uint256 _data) external {
      y = _data;
      emit DataStoredAnonymous(msg.sender, _data);
    }

}

deploy.js 或 deploy.ts 取决于您的喜好

import { ethers } from "hardhat";

async function main() {
  const Lock = await ethers.getContractFactory("Lock");
  const lock = await Lock.deploy();

  await lock.deployed();

  console.log(`deployed to ${lock.address}`);
  const tx1 = await lock.storeDataNonAnonymous(10);
  const txReceipt1 = await tx1.wait()
  console.log("event non-anonymous",txReceipt1.events)

  const tx2 = await lock.storeDataAnonymous(12345);
  const txReceipt2 = await tx2.wait()
  console.log("event anonymous",txReceipt2.events)

}

// We recommend this pattern to be able to use async/await everywhere
// and properly handle errors.
main().catch((error) => {
  console.error(error);
  process.exitCode = 1;
});

在终端上部署后的结果，保留用于指定事件签名的 topic[0] 不会显示

Compiled 1 Solidity file successfully
deployed to 0x5FbDB2315678afecb367f032d93F642f64180aa3
event non-anonymous [
  {
    transactionIndex: 0,
    blockNumber: 2,
    transactionHash: '0x22e2b2c6274a83e0c6ff9e2733e7875940e038f3faf5641d77ede41958657fa0',
    address: '0x5FbDB2315678afecb367f032d93F642f64180aa3',
    topics: [
      '0xe70463dc16bf49899544f11b2caa7874683dbf886102edb6cbc82d728dc425d4',
      '0x000000000000000000000000000000000000000000000000000000000000000a'
    ],
    data: '0x000000000000000000000000f39fd6e51aad88f6f4ce6ab8827279cfffb92266',
    logIndex: 0,
    blockHash: '0x1491b08df4abb9ac8aaeb3be796ab0635957668224470944fd215400a02ce276',
    args: [
      '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266',
      BigNumber { value: "10" },
      admin: '0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266',
      data: BigNumber { value: "10" }
    ],
    decode: [Function (anonymous)],
    event: 'DataStoredNonAnonymous',
    eventSignature: 'DataStoredNonAnonymous(address,uint256)',
    removeListener: [Function (anonymous)],
    getBlock: [Function (anonymous)],
    getTransaction: [Function (anonymous)],
    getTransactionReceipt: [Function (anonymous)]
  }
]
event anonymous [
  {
    transactionIndex: 0,
    blockNumber: 3,
    transactionHash: '0x76ec1eef5693031441fd0446ab681d3f703cca3a016167b343ad8d75fdfd478f',
    address: '0x5FbDB2315678afecb367f032d93F642f64180aa3',
    topics: [
      '0x0000000000000000000000000000000000000000000000000000000000003039'
    ],
    data: '0x000000000000000000000000f39fd6e51aad88f6f4ce6ab8827279cfffb92266',
    logIndex: 0,
    blockHash: '0xd4f64019225eb982522f8f41a1cc2d6869a7ac41f5d93e5b6f7fb39607914e78',
    removeListener: [Function (anonymous)],
    getBlock: [Function (anonymous)],
    getTransaction: [Function (anonymous)],
    getTransactionReceipt: [Function (anonymous)]
  }
]

【讨论】：