classic-ui/scripts/helpers/download.js

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import fs from 'fs'
import zlib from 'zlib'
import Web3 from 'web3'
import networkConfig, { blockSyncInterval } from '../../networkConfig'
export function download({ name, directory }) {
const path = `${directory}${name}.gz`.toLowerCase()
const data = fs.readFileSync(path, { flag: 'as+' })
const content = zlib.inflateSync(data)
return content
}
export function loadCachedEvents({ name, directory, deployedBlock }) {
try {
const module = download({ contentType: 'string', directory, name })
if (module) {
const events = JSON.parse(module)
return {
events,
lastBlock: events[events.length - 1].blockNumber
}
}
} catch (err) {
console.error(`Method loadCachedEvents has error: ${err.message}`)
return {
events: [],
lastBlock: deployedBlock
}
}
}
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export async function getPastEvents({ type, fromBlock, netId, events, contractAttrs }) {
let downloadedEvents = events
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let [{ url: rpcUrl }] = Object.values(networkConfig[`netId${netId}`].rpcUrls)
const provider = new Web3.providers.HttpProvider(rpcUrl)
const web3 = new Web3(provider)
const contract = new web3.eth.Contract(...contractAttrs)
const currentBlockNumber = await web3.eth.getBlockNumber()
// PoS networks index blocks too fast, so a buffer is needed
const blockNumberBuffer = currentBlockNumber - 3
const blockDifference = Math.ceil(blockNumberBuffer - fromBlock)
// eth_logs and eth_filter are restricted > 10,000 block queries
const blockRange = blockSyncInterval ? blockSyncInterval : 10_000
let chunksCount = blockDifference === 0 ? 1 : Math.ceil(blockDifference / blockRange)
const chunkSize = Math.ceil(blockDifference / chunksCount)
let toBlock = fromBlock + chunkSize
if (fromBlock < currentBlockNumber) {
if (toBlock >= currentBlockNumber) {
toBlock = currentBlockNumber
chunksCount = 1
}
console.log(`Fetching ${type}, chainId - ${netId}`, `chunksCount - ${chunksCount}`)
for (let i = 0; i < chunksCount; i++)
try {
await new Promise((resolve) => setTimeout(resolve, 200))
console.log(`fromBlock - ${fromBlock}`)
console.log(`toBlock - ${toBlock}`)
const eventsChunk = await contract.getPastEvents(type, { fromBlock, toBlock })
if (eventsChunk) {
downloadedEvents = downloadedEvents.concat(eventsChunk)
console.log('downloaded events count - ', eventsChunk.length)
console.log('____________________________________________')
}
fromBlock = toBlock
toBlock += chunkSize
} catch (err) {
console.log('getPastEvents events', `chunk number - ${i}, has error: ${err.message}`)
}
}
return downloadedEvents
}