如何通过 web3 和 infura 提供商集成智能合约
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【中文标题】如何通过 web3 和 infura 提供商集成智能合约【英文标题】:How to integrate smart contract via web3 and infura provider 【发布时间】:2019-11-26 15:21:35 【问题描述】:我用 infura 提供者创建了一个项目
const web3 = new Web3(new Web3.providers.HttpProvider('https://ropsten.infura.io/v3/07630919731949aa87a45b96c98a834d'))
我尝试调用智能合约的方法
to: addressTo,
from: addressFrom,
data:
name: 'addWhitelisted',
inputs: [
name: 'account',
address: '0x57e755461FF79176fC8f14B085A8CBb4AE1fC2f6'
]
然后我需要签署交易并致电web3.eth.sendSignedTransaction
?
但是当我签名时,我得到一个错误。请帮忙。我做错了什么?
-
应该是什么数据?
【问题讨论】:
【参考方案1】:您需要使用new web3.eth.Contract().methods.MyMethod().encodeABI()
为您的合约生成transaction
的data
属性
下面是代码示例:
const Web3 = require('web3')
const web3 = new Web3(new Web3.providers.HttpProvider('https://ropsten.infura.io/v3/07630919731949aa87a45b96c98a834d'))
const CONTRACT_ADDRESS = '0x3312fd1a550451beeda9fd2bd6e686af9ebabe1e'
const ADDRESS_TO_WHITELIST = '0x11c652e32b8064000a4ab34af0ae24e4966e309e'
const PRIVATE_KEY = '0x331E79A051B6D2B1F34C4195E70752D59E7E4F7E55244FA67BCC9CF476141231'
const CONTRACT_ABI = [ constant: false, inputs: [ name: '_address', type: 'address' ], name: 'addWhitelisted', outputs: [], payable: false, stateMutability: 'nonpayable', type: 'function' , constant: true, inputs: [ name: '', type: 'address' ], name: 'whiteList', outputs: [ name: '', type: 'bool' ], payable: false, stateMutability: 'view', type: 'function' ]
const sendRawTx = rawTx =>
new Promise((resolve, reject) =>
web3.eth
.sendSignedTransaction(rawTx)
.on('transactionHash', resolve)
.on('error', reject)
);
(async () =>
const address: from = web3.eth.accounts.privateKeyToAccount(PRIVATE_KEY)
const contract = new web3.eth.Contract(CONTRACT_ABI, CONTRACT_ADDRESS)
const query = await contract.methods.addWhitelisted(ADDRESS_TO_WHITELIST)
const transaction =
to: CONTRACT_ADDRESS,
from,
value: '0',
data: query.encodeABI(),
gasPrice: web3.utils.toWei('20', 'gwei'),
gas: Math.round((await query.estimateGas( from )) * 1.5), // 1.5 coefficient, just make sure that gas amount is enough
nonce: await web3.eth.getTransactionCount(from, 'pending')
const signed = await web3.eth.accounts.signTransaction(transaction, PRIVATE_KEY)
const hash = await sendRawTx(signed.rawTransaction)
console.log(hash)
)()
在哪里Contract.sol
pragma solidity ^0.5.10;
contract Test
mapping (address => bool) public whiteList;
function addWhitelisted(address _address) public
whiteList[_address] = true;
【讨论】:
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