parallel rpc batching

services/events.js

@@ -5,17 +5,10 @@ import { download } from '@/store/snark'
 import networkConfig from '@/networkConfig'
 import InstanceABI from '@/abis/Instance.abi.json'
 import { CONTRACT_INSTANCES, eventsType } from '@/constants'
-import { sleep, formatEvents, capitalizeFirstLetter } from '@/utils'
+import { sleep, flattenNArray, formatEvents, capitalizeFirstLetter } from '@/utils'
 
 const supportedCaches = ['1', '56', '100', '137']
 
-let store
-if (process.browser) {
-  window.onNuxtReady(({ $store }) => {
-    store = $store
-  })
-}
-
 class EventService {
   constructor({ netId, amount, currency, factoryMethods }) {
     this.idb = window.$nuxt.$indexedDB(netId)
@@ -237,7 +230,7 @@ class EventService {
     }
   }
 
-  async getEventsPartFromRpc({ fromBlock, toBlock, type }) {
+  async getEventsPartFromRpc({ fromBlock, toBlock, type }, shouldRetry = false, i = 0) {
     try {
       const { currentBlockNumber } = await this.getBlocksDiff({ fromBlock })
 
@@ -248,11 +241,43 @@ class EventService {
         }
       }
 
-      const events = await this.contract.getPastEvents(capitalizeFirstLetter(type), {
+      const rpcRequest = new Promise((resolve, reject) => {
+        const repsonse = this.contract.getPastEvents(capitalizeFirstLetter(type), {
           fromBlock,
           toBlock
         })
 
+        if (repsonse) {
+          resolve(repsonse)
+        } else {
+          reject(new Error())
+        }
+      })
+
+      let events = []
+
+      if (shouldRetry) {
+        i = i + 1
+
+        try {
+          events = await Promise.resolve(rpcRequest)
+        } catch (e) {
+          await sleep(200)
+
+          events = await this.getEventsPartFromRpc(
+            {
+              fromBlock,
+              toBlock,
+              type
+            },
+            i !== 5,
+            i
+          )
+        }
+      } else {
+        events = await Promise.resolve(rpcRequest)
+      }
+
       if (!events?.length) {
         return {
           events: [],
@@ -268,55 +293,56 @@ class EventService {
     }
   }
 
+  createBatchRequest({ batchIndex, batchSize, batchBlocks, blockDenom, type }) {
+    return new Array(batchSize).fill('').map(
+      (e, i) =>
+        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)
+        })
+    )
+  }
+
   async getBatchEventsFromRpc({ fromBlock, type }) {
     try {
+      const batchSize = 10
       const blockRange = 10000
       const { blockDifference, currentBlockNumber } = await this.getBlocksDiff({ fromBlock })
 
-      let numberParts = blockDifference === 0 ? 1 : Math.ceil(blockDifference / blockRange)
+      const batchDigest = blockDifference === 0 ? 1 : Math.ceil(blockDifference / blockRange)
-      const part = Math.ceil(blockDifference / numberParts)
+      const blockDenom = Math.ceil(blockDifference / batchDigest)
+      const batchCount = Math.ceil(batchDigest / batchSize)
+
+      const blocks = new Array(batchCount * batchSize).fill('')
+      const batchBlocks = blocks.map((e, i) => (i + 1) * blockDenom + fromBlock)
 
       let events = []
-      let loadedBlocks = 0
-      let toBlock = fromBlock + part
 
       if (fromBlock < currentBlockNumber) {
-        if (toBlock >= currentBlockNumber) {
+        for (let batchIndex = 0; batchIndex < batchCount; batchIndex++) {
-          toBlock = 'latest'
+          const batch = await Promise.all(
-          numberParts = 1
+            this.createBatchRequest({ batchIndex, batchBlocks, blockDenom, batchSize, type })
-        }
+          )
-        if (store.state.loading.progress !== 98) {
+
-          store.dispatch('loading/updateProgress', { message: 'Fetching the past events', progress: 0 })
+          events = events.concat(batch)
         }
 
-        for (let i = 0; i < numberParts; i++) {
+        events = flattenNArray(events)
-          try {
-            await sleep(200)
-            const partOfEvents = await this.getEventsPartFromRpc({ fromBlock, toBlock, type })
-            if (partOfEvents) {
-              events = events.concat(partOfEvents.events)
-            }
-            loadedBlocks += toBlock - fromBlock
-            fromBlock = toBlock
-            toBlock += part
 
-            const progressInt = parseInt((loadedBlocks / blockDifference) * 100)
-            console.log('Progress: ', progressInt)
-            if (store.state.loading.progress !== 98) {
-              store.dispatch('loading/updateProgress', {
-                message: 'Fetching the past events',
-                progress: progressInt === 100 ? 98 : progressInt
-              })
-            }
-          } catch {
-            numberParts = numberParts + 1
-          }
-        }
-        if (events.length) {
         return {
-            events,
+          lastBlock: events[events.length - 1].blockNumber,
-            lastBlock: toBlock === 'latest' ? currentBlockNumber : toBlock
+          events
-          }
         }
       }
       return undefined
@@ -328,6 +354,7 @@ class EventService {
   async getEventsFromRpc({ fromBlock, type }) {
     try {
       const { blockDifference } = await this.getBlocksDiff({ fromBlock })
+
       let events
 
       if (blockDifference < 10000) {

services/merkleTree.js

@@ -22,12 +22,12 @@ class MerkleTreeService {
       commitment,
       instanceName,
       fileFolder: 'trees',
-      fileName: `deposits_${currency}_${amount}_bloom.json.zip`
+      fileName: `deposits_${currency}_${amount}_bloom.json.gz`
     })
   }
 
   getFileName(partNumber = trees.PARTS_COUNT) {
-    return `trees/deposits_${this.currency}_${this.amount}_slice${partNumber}.json.zip`
+    return `trees/deposits_${this.currency}_${this.amount}_slice${partNumber}.json.gz`
   }
 
   createTree({ events }) {

store/application.js

@@ -358,7 +358,7 @@ const actions = {
     try {
       const module = await download({
         contentType: 'string',
-        name: `events/encrypted_notes_${netId}.json.zip`
+        name: `events/encrypted_notes_${netId}.json.gz`
       })
 
       if (module) {

utils/index.js

@@ -8,6 +8,12 @@ export * from './stringUtils'
 export * from './numberUtils'
 export * from './instanceUtils'
 
+export function flattenNArray(arr) {
+  return arr.reduce((flat, toFlatten) => {
+    return flat.concat(Array.isArray(toFlatten) ? flattenNArray(toFlatten) : toFlatten)
+  }, [])
+}
+
 export function sleep(ms) {
   return new Promise((resolve) => setTimeout(resolve, ms))
 }