ALIS トークンのトランザクション履歴を取得

CEO 自ら実装レベルで Ethereum を理解しようとしているのすごい！

雑な実装だけど特定のEOA が from の 過去 X ブロックのトークントランザクション履歴を取得することはできた。

ALIS さんがやりたいこととはズレているかも？

動作デモ（web3.js v0.20.6, Mainnet, MetaMask が必要）

code:demo.js

// ALIS TOKEN の CONTRACT ADDRESS

const TOKEN_ADDRESS = "0xEA610B1153477720748DC13ED378003941d84fAB"

// Web3js の初期化

if (typeof web3 !== 'undefined') {

window.web3js = new Web3(web3.currentProvider)

} else {

alert("Please use MetaMask")

}

$(document.body).append('<h1>ALIS TRANSACTION HISTORY</h1>')

$(document.body).append('<p>Last <input type="number" size="20" value="50000" id="blockNum"> block</p>')

$(document.body).append('<p>EOA address (from): <input type="text" size="70" id="address" value="0x4b01721f0244e7c5b5f63c20942850e447f5a5ee"></p>')

$(document.body).append('<p><button onclick="searchTx()">Search TX</button>')

$(document.body).append('<div id="result"></div>')

function searchTx() {

// EOA アドレス

let address = $('#address').val()

if (address.length == 42) {

web3js.eth.getBlockNumber(function(error, result) {

let fromBlock = result - $('#blockNum').val()

getTransferHistory(TOKEN_ADDRESS, fromBlock, address)

})

}

}

function padLeft(address) {

return "0x000000000000000000000000" + address.slice(2)

}

function removeLeft(address) {

return '0x' + address.slice(26)

}

function getTransferHistory(tokenAddress, fromBlock, fromEOAAddress) {

$('#result').empty()

let filter = web3js.eth.filter({address: tokenAddress,

fromBlock: fromBlock,

toBlock: 'latest',

topics:[

web3js.sha3("Transfer(address,address,uint256)"),

padLeft(fromEOAAddress)

]

})

let count = 0

filter.watch(function(error, result){

console.log(result)

let e = '<h1>TX' + ++count + '</h1>'

+ '<ul>'

+ '<li>value: ' + web3js.fromWei(result.data, 'ether') + '</li>'

+ '</ul>'

$('#result').prepend(e)

})

}

トランザクション履歴が多いため、履歴を取得するブロックを指定しています。

code:example@1.0.js

const Web3 = require('web3');

// Transfer イベントを取得するための最低限の ABI

// Settings

const TOKEN_ADDRESS = "0xEA610B1153477720748DC13ED378003941d84fAB" // トークンコントラクトのアドレス

const EOA_ADDRESS = "0x4b01721f0244e7c5b5f63c20942850e447f5a5ee" // EOA のアドレス

const FROM_BLOCK = 6000000

const TO_BLOCK = 6500000

const PROVIDER = 'wss://mainnet.infura.io/ws'

// Web3 初期化

const web3 = new Web3(PROVIDER)

console.log(web3.version)

async function getTokenTransferHistory(tokenAbi, tokenContractAddress, fromAddress, fromBlock, toBlock) {

const contract = new web3.eth.Contract(tokenAbi, tokenContractAddress)

const events = await contract.getPastEvents("Transfer", {

fromBlock: fromBlock,

toBlock: toBlock,

filter: {from: fromAddress}

})

if (events) {

for (let event of events) {

data = {

from: event.returnValues.from,

to: event.returnValues.to,

value: web3.utils.fromWei(event.returnValues.value)

}

console.log(data)

}

}

}

getTokenTransferHistory(TOKEN_ABI, TOKEN_ADDRESS, EOA_ADDRESS, FROM_BLOCK, TO_BLOCK)

動作デモ2 (Infura を使用。MetaMask 不要）

code:demo2.js

// ALIS TOKEN の CONTRACT ADDRESS

const TOKEN_ADDRESS = "0xEA610B1153477720748DC13ED378003941d84fAB"

// PROVIDER (INFURA)

const PROVIDER = 'wss://mainnet.infura.io/ws'

// Transfer イベントを取得するための最低限の ABI

// Web3js の初期化

window.web3js = new Web3(PROVIDER)

$(document.body).append('<h1>ALIS TRANSACTION HISTORY</h1>')

$(document.body).append('<p>Last <input type="number" size="20" value="50000" id="blockNum"> block</p>')

$(document.body).append('<p>EOA address (from): <input type="text" size="70" id="address" value="0x4b01721f0244e7c5b5f63c20942850e447f5a5ee"></p>')

$(document.body).append('<p><button onclick="searchTx()">Search TX</button>')

$(document.body).append('<div id="result"></div>')

async function searchTx() {

$('#result').empty()

let address = $('#address').val()

if (address.length == 42) {

let latestBlock = await web3js.eth.getBlockNumber()

let fromBlock = latestBlock - $('#blockNum').val()

console.log(fromBlock)

let transfers = await getTokenTransferHistory(TOKEN_ABI, TOKEN_ADDRESS, address, fromBlock, 'latest')

let count = 0

for (t of transfers) {

let e = '<h1>TX' + ++count + '</h1>'

+ '<ul>'

+ '<li>from: ' + t.returnValues.from + '</li>'

+ '<li>to: ' + t.returnValues.to + '</li>'

+ '<li>value: ' + web3js.utils.fromWei(t.returnValues.value, 'ether') + '</li>'

+ '</ul>'

$('#result').prepend(e)

}

}

}

async function getTokenTransferHistory(tokenAbi, tokenContractAddress, fromAddress, fromBlock, toBlock) {

return new Promise(async function(resolve, reject) {

const contract = new web3js.eth.Contract(tokenAbi, tokenContractAddress)

const events = await contract.getPastEvents("Transfer", {

fromBlock: fromBlock,

toBlock: toBlock,

filter: {from: fromAddress}

})

resolve(events)

})

}