Etherscan API 获取已验证源码的合约ABI - 区块

简介：Etherscan 大多数朋友都比较熟悉了，它是主流以太坊区块浏览器。Etherscan 有面向开发者提供 API 服务以方便其检索以太坊区块链信息。本文示例如何使用 Etherscan API 获取以太坊已验证源码的合约ABI。

Etherscan 大多数朋友都比较熟悉了，它是主流以太坊区块浏览器。Etherscan 有面向开发者提供 API 服务以方便其检索以太坊区块链信息。

Etherscan API 在没有密钥的情况下，支持每秒最多五次请求。有更多请求需求可以在这里申请密钥：https://etherscancom.freshdesk.com/support/solutions/articles/35000022163-i-need-an-api-key

使用 Etherscan API 获取以太坊已验证源码的合约ABI：

语句：

https://api.etherscan.io/api?module=contract&action=getabi&address={填入合约地址}&apikey={填入你的ApiKey}

当然，不使用 apikey 也是可以查询的：

https://api.etherscan.io/api?module=contract&action=getabi&address={填入合约地址}

Node.js 代码示例：

const fetch = require('node-fetch');

fetch('https://api.etherscan.io/api?module=contract&action=getabi&address={填入合约地址}&apikey={填入你的ApiKey}', {
    method: 'get',
}).then(response => response.json()
    .then(data => console.log(data)));

返回的 JSON 示例：

{
  "status": "1",
  "message": "OK",
  "result": "[{\"constant\": true, \"inputs\": [{ \"name\": \"\", \"type\": \"uint256\" }], \"name\": \"proposals\", \"outputs\": [{ \"name\": \"recipient\", \"type\": \"address\" }, { \"name\": \"amount\", \"type\": \"uint256\" }, { \"name\": \"description\", \"type\": \"string\" }, { \"name\": \"votingDeadline\", \"type\": \"uint256\" }, { \"name\": \"open\", \"type\": \"bool\" }, { \"name\": \"proposalPassed\", \"type\": \"bool\" }, { \"name\": \"proposalHash\", \"type\": \"bytes32\" }, { \"name\": \"proposalDeposit\", \"type\": \"uint256\" }, { \"name\": \"newCurator\", \"type\": \"bool\" }, { \"name\": \"yea\", \"type\": \"uint256\" }, { \"name\": \"nay\", \"type\": \"uint256\" }, { \"name\": \"creator\", \"type\": \"address\" }], \"type\": \"function\" }]"
}

result提取并去除转义后得：

[{
    "constant": true,
    "inputs": [{
        "name": "",
        "type": "uint256"
    }],
    "name": "proposals",
    "outputs": [{
        "name": "recipient",
        "type": "address"
    }, {
        "name": "amount",
        "type": "uint256"
    }, {
        "name": "description",
        "type": "string"
    }, {
        "name": "votingDeadline",
        "type": "uint256"
    }, {
        "name": "open",
        "type": "bool"
    }, {
        "name": "proposalPassed",
        "type": "bool"
    }, {
        "name": "proposalHash",
        "type": "bytes32"
    }, {
        "name": "proposalDeposit",
        "type": "uint256"
    }, {
        "name": "newCurator",
        "type": "bool"
    }, {
        "name": "yea",
        "type": "uint256"
    }, {
        "name": "nay",
        "type": "uint256"
    }, {
        "name": "creator",
        "type": "address"
    }],
    "type": "function"
}]

这是使用 Web3.js 和 Jquery 检索合约 ABI 以与合约进行交互的简单示例：

var Web3 = require('web3');
    var web3 = new Web3(new Web3.providers.HttpProvider());
    var version = web3.version.api;
            
    $.getJSON('http://api.etherscan.io/api?module=contract&action=getabi&address=0xfb6916095ca1df60bb79ce92ce3ea74c37c5d359', function (data) {
        var contractABI = "";
        contractABI = JSON.parse(data.result);
        if (contractABI != ''){
            var MyContract = web3.eth.contract(contractABI);
            var myContractInstance = MyContract.at("0xfb6916095ca1df60bb79ce92ce3ea74c37c5d359");
            var result = myContractInstance.memberId("0xfe8ad7dd2f564a877cc23feea6c0a9cc2e783715");
            console.log("result1 : " + result);            
            var result = myContractInstance.members(1);
            console.log("result2 : " + result);
        } else {
            console.log("Error" );
        }            
    });

Etherscan API 官方文档：https://etherscan.io/apis

Etherscan API 思维导图：

Etherscan API.png

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