README.md

@@ -2,6 +2,12 @@
 
 ## Build Setup
 
+If you use the latest Node.js version, you should modify your NODE_OPTIONS env
+
+```bash
+export NODE_OPTIONS="--openssl-legacy-provider"
+```
+
 ```bash
 # install dependencies
 $ yarn install

assets/events.worker.js

@@ -11,6 +11,7 @@ import { ExtendedProvider } from './services/provider'
 import { POOL_CONTRACT, RPC_LIST, FALLBACK_RPC_LIST, workerEvents, numbers } from './services/constants'
 import { sleep } from './services/utilities'
 import { poolAbi } from './services/pool'
+import { downloadEvents } from './services/downloadEvents'
 
 const getProviderWithSigner = (chainId) => {
   return new ExtendedProvider(RPC_LIST[chainId], chainId, FALLBACK_RPC_LIST[chainId])
@@ -165,6 +166,14 @@ const getCommitments = async ({ withCache, lastSyncBlock }) => {
         return { commitmentEvents: cachedEvents }
       }
       blockFrom = newBlockFrom > currentBlock ? currentBlock : newBlockFrom
+    } else {
+      const downloadedEvents = await downloadEvents(`commitments_${self.chainId}.json`, blockFrom)
+
+      if (downloadedEvents.events.length) {
+        cachedEvents.push(...downloadedEvents.events)
+
+        blockFrom = downloadedEvents.lastBlock
+      }
     }
 
     const commitmentEvents = await getCommitmentBatch({ blockFrom, blockTo: currentBlock, cachedEvents, withCache })

assets/nullifier.worker.js

@@ -8,6 +8,7 @@ import { ExtendedProvider } from './services/provider'
 import { POOL_CONTRACT, RPC_LIST, FALLBACK_RPC_LIST, workerEvents, numbers } from './services/constants'
 import { sleep } from './services/utilities'
 import { poolAbi } from './services/pool'
+import { downloadEvents } from './services/downloadEvents'
 
 const getProviderWithSigner = (chainId) => {
   return new ExtendedProvider(RPC_LIST[chainId], chainId, FALLBACK_RPC_LIST[chainId])
@@ -120,6 +121,14 @@ const getCachedEvents = async () => {
       return { blockFrom, cachedEvents }
     }
     blockFrom = newBlockFrom > currentBlock ? currentBlock : newBlockFrom
+  } else {
+    const downloadedEvents = await downloadEvents(`nullifiers_${self.chainId}.json`, blockFrom)
+
+    if (downloadedEvents.events.length) {
+      cachedEvents.push(...downloadedEvents.events)
+
+      blockFrom = downloadedEvents.lastBlock
+    }
   }
 
   return { blockFrom, cachedEvents }

assets/services/downloadEvents.js

@@ -0,0 +1,37 @@
+import { unzipAsync } from "./zip"
+
+export async function downloadEvents(fileName, deployedBlock) {
+  fileName = fileName.toLowerCase()
+
+  // @ts-ignore
+  const prefix = __webpack_public_path__.slice(0, -7)
+
+  try {
+    const resp = await fetch(`${prefix}/${fileName}.zip`, {
+      method: 'GET',
+      headers: {
+        'Content-Type': 'application/x-www-form-urlencoded',
+      }
+    })
+  
+    const arrayBuffer = await resp.arrayBuffer()
+  
+    const { [fileName]: content } = await unzipAsync(new Uint8Array(arrayBuffer))
+  
+    const events = JSON.parse(new TextDecoder().decode(content))
+  
+    const lastBlock = events && Array.isArray(events) && events[events.length - 1]
+      ? events[events.length - 1].blockNumber
+      :  deployedBlock
+
+    return {
+      events,
+      lastBlock
+    }
+  } catch {
+    return {
+      events: [],
+      lastBlock: deployedBlock
+    }
+  }
+}

services/events/index.ts

@@ -7,6 +7,7 @@ import { isEmpty, sleep, toChecksumAddress } from '@/utilities'
 import { getBridgeHelper, getBridgeProxy, getAmbBridge } from '@/contracts'
 
 import { EventsClass, GetAffirmationParams, GetRelayedMessageParams, SaveEventsParams } from './@types'
+import { downloadEvents } from './load'
 
 export * from './batch'
 
@@ -33,19 +34,31 @@ class EventAggregator implements EventsClass {
         storeName: `${IndexDBStores.ACCOUNT_EVENTS}_${chainId}`,
       })
 
+      const newEvents = []
+
       if (cachedEvents?.length) {
         const [latestEvent] = cachedEvents.slice(-numbers.ONE)
         blockFrom = Number(latestEvent.blockNumber) + numbers.ONE
+      } else {
+        const downloadedEvents = await downloadEvents(`accounts_${chainId}.json`, blockFrom)
+
+        if (downloadedEvents.events.length) {
+          newEvents.push(...downloadedEvents.events)
+    
+          blockFrom = downloadedEvents.lastBlock
+        }
       }
 
       const { events: graphEvents, lastSyncBlock } = await getAllAccounts({ fromBlock: blockFrom, chainId })
 
-      const [account] = graphEvents.filter((e: { key: string }) => e.key === publicKey)
+      newEvents.push(...graphEvents)
+
+      const [account] = newEvents.filter((e: { key: string }) => e.key === publicKey)
 
       if (account) {
         this.saveEvents({
           chainId,
-          events: graphEvents,
+          events: newEvents,
           storeName: IndexDBStores.ACCOUNT_EVENTS,
         })
         return account.owner
@@ -68,7 +81,7 @@ class EventAggregator implements EventsClass {
         }
       })
 
-      const newEvents = graphEvents.concat(accountEvents)
+      newEvents.push(...accountEvents)
 
       this.saveEvents({
         chainId,
@@ -76,7 +89,7 @@ class EventAggregator implements EventsClass {
         storeName: IndexDBStores.ACCOUNT_EVENTS,
       })
 
-      const events = cachedEvents.concat(newEvents).filter((e: { key: string }) => e.key === publicKey)
+      const events = newEvents.filter((e: { key: string }) => e.key === publicKey)
 
       if (isEmpty(events)) {
         return undefined
@@ -87,6 +100,7 @@ class EventAggregator implements EventsClass {
 
       return event.owner
     } catch (err) {
+      console.log(err)
       return undefined
     }
   }
@@ -113,19 +127,30 @@ class EventAggregator implements EventsClass {
         storeName: `${IndexDBStores.ACCOUNT_EVENTS}_${chainId}`,
       })
 
+      const newEvents = []
+
       if (cachedEvents?.length) {
         const [latestEvent] = cachedEvents.slice(-numbers.ONE)
         blockFrom = Number(latestEvent.blockNumber) + numbers.ONE
+      } else {
+        const downloadedEvents = await downloadEvents(`accounts_${chainId}.json`, blockFrom)
+
+        if (downloadedEvents.events.length) {
+          newEvents.push(...downloadedEvents.events)
+    
+          blockFrom = downloadedEvents.lastBlock
+        }
       }
 
       const { events: graphEvents, lastSyncBlock } = await getAllAccounts({ fromBlock: blockFrom, chainId })
+      newEvents.push(...graphEvents)
 
-      const [account] = graphEvents.filter((e: { owner: string }) => toChecksumAddress(e.owner) === toChecksumAddress(address))
+      const [account] = newEvents.filter((e: { owner: string }) => toChecksumAddress(e.owner) === toChecksumAddress(address))
 
       if (account) {
         this.saveEvents({
           chainId,
-          events: graphEvents,
+          events: newEvents,
           storeName: IndexDBStores.ACCOUNT_EVENTS,
         })
         return account.key
@@ -148,7 +173,7 @@ class EventAggregator implements EventsClass {
         }
       })
 
-      const newEvents = graphEvents.concat(accountEvents)
+      newEvents.push(...accountEvents)
 
       this.saveEvents({
         chainId,
@@ -169,6 +194,7 @@ class EventAggregator implements EventsClass {
 
       return event.key
     } catch (err) {
+      console.log(err)
       return undefined
     }
   }

services/events/load.ts

@@ -0,0 +1,49 @@
+import { unzip } from 'fflate'
+
+export function unzipAsync(data: Uint8Array) {
+  return new Promise((res, rej) => {
+    unzip(data, {}, (err, data) => {
+      if (err) {
+        rej(err);
+        return;
+      }
+      res(data);
+    });
+  });
+}
+
+export async function downloadEvents(fileName: string, deployedBlock: number) {
+  fileName = fileName.toLowerCase()
+
+  // @ts-ignore
+  const prefix = __webpack_public_path__.slice(0, -7)
+
+  try {
+    const resp = await fetch(`${prefix}/${fileName}.zip`, {
+      method: 'GET',
+      headers: {
+        'Content-Type': 'application/x-www-form-urlencoded',
+      }
+    })
+  
+    const arrayBuffer = await resp.arrayBuffer()
+  
+    const { [fileName]: content } = (await unzipAsync(new Uint8Array(arrayBuffer))) as any
+  
+    const events = JSON.parse(new TextDecoder().decode(content))
+  
+    const lastBlock = events && Array.isArray(events) && events[events.length - 1]
+      ? events[events.length - 1].blockNumber
+      :  deployedBlock
+
+    return {
+      events,
+      lastBlock
+    }
+  } catch {
+    return {
+      events: [],
+      lastBlock: deployedBlock
+    }
+  }
+}