92 lines
2.7 KiB
JavaScript
92 lines
2.7 KiB
JavaScript
import fs from 'fs'
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import zlib from 'zlib'
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import Web3 from 'web3'
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import networkConfig from '../../networkConfig'
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export async function download({ name, directory, contentType }) {
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const path = `${directory}${name}.gz`.toLowerCase()
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const data = fs.readFileSync(path)
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const content = zlib.inflateSync(data)
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return content
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}
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export async function loadCachedEvents({ name, directory, deployedBlock }) {
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try {
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const module = await download({ contentType: 'string', directory, name })
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if (module) {
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const events = JSON.parse(module)
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return {
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events,
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lastBlock: events[events.length - 1].blockNumber
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}
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}
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} catch (err) {
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console.error(`Method loadCachedEvents has error: ${err.message}`)
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return {
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events: [],
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lastBlock: deployedBlock
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}
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}
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}
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export async function getPastEvents({ type, fromBlock, netId, events, contractAttrs }) {
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let downloadedEvents = events
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let [{ url: rpcUrl }] = Object.values(networkConfig[`netId${netId}`].rpcUrls)
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if (netId === '5') {
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rpcUrl = 'https://goerli.infura.io/v3/9aa3d95b3bc440fa88ea12eaa4456161'
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}
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const provider = new Web3.providers.HttpProvider(rpcUrl)
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const web3 = new Web3(provider)
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const contract = new web3.eth.Contract(...contractAttrs)
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const currentBlockNumber = await web3.eth.getBlockNumber()
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// PoS networks index blocks too fast, so a buffer is needed
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const blockNumberBuffer = currentBlockNumber - 3
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const blockDifference = Math.ceil(blockNumberBuffer - fromBlock)
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// eth_logs and eth_filter are restricted > 10,000 block queries
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const blockRange = 10000
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let chunksCount = blockDifference === 0 ? 1 : Math.ceil(blockDifference / blockRange)
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const chunkSize = Math.ceil(blockDifference / chunksCount)
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let toBlock = fromBlock + chunkSize
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if (fromBlock < currentBlockNumber) {
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if (toBlock >= currentBlockNumber) {
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toBlock = currentBlockNumber
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chunksCount = 1
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}
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console.log(`Fetching ${type}, chainId - ${netId}`, `chunksCount - ${chunksCount}`)
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for (let i = 0; i < chunksCount; i++)
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try {
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await new Promise((resolve) => setTimeout(resolve, 200))
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console.log(`fromBlock - ${fromBlock}`)
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console.log(`toBlock - ${toBlock}`)
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const eventsChunk = await contract.getPastEvents(type, { fromBlock, toBlock })
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if (eventsChunk) {
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downloadedEvents = downloadedEvents.concat(eventsChunk)
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console.log('downloaded events count - ', eventsChunk.length)
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console.log('____________________________________________')
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}
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fromBlock = toBlock
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toBlock += chunkSize
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} catch (err) {
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console.log('getPastEvents events', `chunk number - ${i}, has error: ${err.message}`)
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}
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}
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return downloadedEvents
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}
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