classic-ui/services/events.js

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import Web3 from 'web3'
import graph from '@/services/graph'
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import { download } from '@/store/snark'
import networkConfig from '@/networkConfig'
import InstanceABI from '@/abis/Instance.abi.json'
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import { CONTRACT_INSTANCES, eventsType, corsConfig } from '@/constants'
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import { sleep, flattenNArray, formatEvents, capitalizeFirstLetter } from '@/utils'
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const supportedCaches = ['1', '56', '100', '137']
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let store
if (process.browser) {
window.onNuxtReady(({ $store }) => {
store = $store
})
}
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class EventService {
constructor({ netId, amount, currency, factoryMethods }) {
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this.idb = window.$nuxt.$indexedDB(netId)
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const { nativeCurrency } = networkConfig[`netId${netId}`]
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const hasCache = supportedCaches.includes(netId.toString())
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this.netId = netId
this.amount = amount
this.currency = currency
this.factoryMethods = factoryMethods
this.contract = this.getContract({ netId, amount, currency })
this.isNative = nativeCurrency === this.currency
this.hasCache = this.isNative && hasCache
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}
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getInstanceName(type) {
return `${type}s_${this.currency}_${this.amount}`
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}
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updateEventProgress(percentage, type) {
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if (store) {
store.dispatch('loading/updateProgress', {
message: `Fetching past ${type} events`,
progress: Math.ceil(percentage * 100)
})
}
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}
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async getEvents(type) {
let cachedEvents = await this.getEventsFromDB(type)
if (!cachedEvents && this.hasCache) {
cachedEvents = await this.getEventsFromCache(type)
}
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return cachedEvents
}
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async updateEvents(type, cachedEvents) {
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const { deployedBlock } = networkConfig[`netId${this.netId}`]
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const savedEvents = cachedEvents || (await this.getEvents(type))
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let fromBlock = deployedBlock
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if (savedEvents) {
fromBlock = savedEvents.lastBlock + 1
}
const newEvents = await this.getEventsFromBlock({
type,
fromBlock,
graphMethod: `getAll${capitalizeFirstLetter(type)}s`
})
const allEvents = [].concat(savedEvents?.events || [], newEvents?.events || []).sort((a, b) => {
if (a.leafIndex && b.leafIndex) {
return a.leafIndex - b.leafIndex
}
return a.blockNumber - b.blockNumber
})
const lastBlock = allEvents[allEvents.length - 1].blockNumber
this.saveEvents({ events: allEvents, lastBlock, type })
return {
events: allEvents,
lastBlock
}
}
async findEvent({ eventName, eventToFind, type }) {
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const instanceName = this.getInstanceName(type)
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let event = await this.idb.getFromIndex({
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storeName: instanceName,
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indexName: eventName,
key: eventToFind
})
if (event) {
return event
}
const savedEvents = await this.getEvents(type)
if (savedEvents) {
event = savedEvents.events.find((event) => event[eventName] === eventToFind)
if (event) {
return event
}
}
const freshEvents = await this.updateEvents(type)
event = freshEvents && freshEvents?.events.find((event) => event[eventName] === eventToFind)
return event
}
getContract({ netId, amount, currency }) {
const config = networkConfig[`netId${netId}`]
const address = config.tokens[currency].instanceAddress[amount]
return this.factoryMethods.getContract(address)
}
async getEventsFromCache(type) {
try {
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const instanceName = this.getInstanceName(type)
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if (!CONTRACT_INSTANCES.includes(String(this.amount))) {
console.error(`Amount doesn't includes in contract instances`)
return
}
const module = await download({
contentType: 'string',
name: `events/${instanceName}.json.gz`
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})
if (module) {
const events = JSON.parse(module)
return {
events,
lastBlock: events[events.length - 1].blockNumber
}
}
return {
events: [],
lastBlock: ''
}
} catch (err) {
return undefined
}
}
async getEventsFromDB(type) {
try {
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const instanceName = this.getInstanceName(type)
const savedEvents = await this.idb.getAll({ storeName: instanceName })
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if (!savedEvents || !savedEvents.length) {
return undefined
}
return {
events: savedEvents,
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lastBlock: savedEvents[savedEvents.length - 1].blockNumber
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}
} catch (err) {
return undefined
}
}
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async getStatisticsRpc({ eventsCount }) {
const { deployedBlock } = networkConfig[`netId${this.netId}`]
const savedEvents = await this.getEvents(eventsType.DEPOSIT)
if (savedEvents.events.length) {
const { events } = await this.updateEvents(eventsType.DEPOSIT, savedEvents)
return events
}
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const blockRange = 4950
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const fromBlock = deployedBlock
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const { blockDifference, currentBlockNumber } = await this.getBlocksDiff({ fromBlock })
let numberParts = blockDifference === 0 ? 1 : Math.ceil(blockDifference / blockRange)
const part = Math.ceil(blockDifference / numberParts)
let events = []
let toBlock = currentBlockNumber
if (fromBlock < currentBlockNumber) {
for (let i = 0; i < numberParts; i++) {
try {
await sleep(200)
const partOfEvents = await this.getEventsPartFromRpc({
fromBlock: toBlock - part,
toBlock,
type: eventsType.DEPOSIT
})
if (partOfEvents) {
events = events.concat(partOfEvents.events)
if (eventsCount <= events.length) {
break
}
}
toBlock -= part
} catch {
numberParts = numberParts + 1
}
}
if (eventsCount !== events.length) {
const savedEvents = await this.getEvents(eventsType.DEPOSIT)
events = events.concat(savedEvents?.events || [])
}
}
return events
}
async getEventsFromGraph({ fromBlock, methodName }) {
try {
const { events, lastSyncBlock } = await graph[methodName]({
fromBlock,
netId: this.netId,
amount: this.amount,
currency: this.currency
})
return {
events,
lastBlock: lastSyncBlock
}
} catch (err) {
return undefined
}
}
async getBlocksDiff({ fromBlock }) {
const currentBlockNumber = await this.factoryMethods.getBlockNumber()
return {
currentBlockNumber,
blockDifference: Math.ceil(currentBlockNumber - fromBlock)
}
}
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getPastEvents({ fromBlock, toBlock, type }) {
return new Promise((resolve, reject) => {
const repsonse = this.contract.getPastEvents(capitalizeFirstLetter(type), {
fromBlock,
toBlock
})
if (repsonse) {
resolve(repsonse)
} else {
reject(new Error())
}
})
}
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async getEventsPartFromRpc({ fromBlock, toBlock, type }, shouldRetry = false, i = 0) {
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try {
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const { currentBlockNumber } = await this.getBlocksDiff({ fromBlock })
if (fromBlock > currentBlockNumber) {
return {
events: [],
lastBlock: fromBlock
}
}
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let events = []
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try {
events = await this.getPastEvents({ fromBlock, toBlock, type })
} catch (e) {
if (shouldRetry) {
i = i + 1
// maximum 10 second buffer for rate-limiting
await sleep(2000 * i)
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events = await this.getEventsPartFromRpc(
{
fromBlock,
toBlock,
type
},
i !== 5,
i
)
}
}
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if (!events?.length) {
return {
events: [],
lastBlock: fromBlock
}
}
return {
events: formatEvents(events, type),
lastBlock: events[events.length - 1].blockNumber
}
} catch (err) {
return undefined
}
}
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createBatchRequest({ batchIndex, batchSize, batchBlocks, blockDenom, type }) {
return new Array(batchSize).fill('').map(
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(_, i) =>
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new Promise(async (resolve) => {
const toBlock = batchBlocks[batchIndex * batchSize + i]
const fromBlock = toBlock - blockDenom
const batchEvents = await this.getEventsPartFromRpc(
{
fromBlock,
toBlock,
type
},
true
)
resolve(batchEvents.events)
})
)
}
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async getBatchEventsFromRpc({ fromBlock, type }) {
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this.updateEventProgress(0, type)
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try {
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const batchSize = 10
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const blockRange = 10000
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const { blockDifference, currentBlockNumber } = await this.getBlocksDiff({ fromBlock })
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const batchDigest = blockDifference === 0 ? 1 : Math.ceil(blockDifference / blockRange)
const blockDenom = Math.ceil(blockDifference / batchDigest)
const batchCount = Math.ceil(batchDigest / batchSize)
const blocks = new Array(batchCount * batchSize).fill('')
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const batchBlocks = blocks.map((_, i) => (i + 1) * blockDenom + fromBlock)
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let events = []
if (fromBlock < currentBlockNumber) {
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for (let batchIndex = 0; batchIndex < batchCount; batchIndex++) {
const batch = await Promise.all(
this.createBatchRequest({ batchIndex, batchBlocks, blockDenom, batchSize, type })
)
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this.updateEventProgress(batchIndex / batchCount, type)
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events = events.concat(batch)
await sleep(200)
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}
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events = flattenNArray(events)
return {
lastBlock: events[events.length - 1].blockNumber,
events
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}
}
return undefined
} catch (err) {
return undefined
}
}
async getEventsFromRpc({ fromBlock, type }) {
try {
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const { blockDifference } = await this.getBlocksDiff({ fromBlock })
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let events
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if (blockDifference < 10000) {
const rpcEvents = await this.getEventsPartFromRpc({ fromBlock, toBlock: 'latest', type })
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events = rpcEvents?.events || []
} else {
const rpcEvents = await this.getBatchEventsFromRpc({ fromBlock, type })
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events = rpcEvents?.events || []
}
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return events
} catch (err) {
return []
}
}
async getEventsFromBlock({ fromBlock, graphMethod, type }) {
try {
// ToDo think about undefined
const rpcEvents = await this.getEventsFromRpc({ fromBlock, type })
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const allEvents = [].concat(rpcEvents || [])
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if (allEvents.length) {
return {
events: allEvents,
lastBlock: allEvents[allEvents.length - 1].blockNumber
}
}
return undefined
} catch (err) {
return undefined
}
}
async saveEvents({ events, lastBlock, type }) {
try {
if (!events || !events.length || this.idb.isBlocked) {
return
}
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const instanceName = this.getInstanceName(type)
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await this.idb.createMultipleTransactions({
data: events,
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storeName: instanceName
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})
await this.idb.putItem({
data: {
blockNumber: lastBlock,
name: instanceName
},
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storeName: 'lastEvents'
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})
} catch (err) {
console.error('saveEvents has error:', err.message)
}
}
}
class EventsFactory {
instances = new Map()
constructor(rpcUrl) {
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const httpProvider = new Web3.providers.HttpProvider(rpcUrl, corsConfig(rpcUrl))
this.provider = new Web3(httpProvider).eth
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}
getBlockNumber = () => {
return this.provider.getBlockNumber()
}
getContract = (address) => {
return new this.provider.Contract(InstanceABI, address)
}
getService = (payload) => {
const instanceName = `${payload.currency}_${payload.amount}`
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if (this.instances.has(instanceName)) {
return this.instances.get(instanceName)
}
const instance = new EventService({
...payload,
factoryMethods: {
getContract: this.getContract,
getBlockNumber: this.getBlockNumber
}
})
this.instances.set(instanceName, instance)
return instance
}
}
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export { EventsFactory }