Attemp to fetch blocks

apps/remix-ide/src/blockchain/providers/vm.ts

@@ -2,6 +2,8 @@ import Web3, { FMT_BYTES, FMT_NUMBER, LegacySendAsyncProvider } from 'web3'
 import { fromWei, toBigInt } from 'web3-utils'
 import { privateToAddress, hashPersonalMessage, isHexString } from '@ethereumjs/util'
 import { extend, JSONRPCRequestPayload, JSONRPCResponseCallback } from '@remix-project/remix-simulator'
+import {toBuffer} from '@ethereumjs/util'
+import { Block } from '@ethereumjs/block'
 import { ExecutionContext } from '../execution-context'
 
 export class VMProvider {
@@ -27,7 +29,7 @@ export class VMProvider {
       })
   }
 
-  async resetEnvironment (stringifiedStateDb?: string) {
+  async resetEnvironment (stringifiedState?: string) {
     if (this.worker) this.worker.terminate()
     this.worker = new Worker(new URL('./worker-vm', import.meta.url))
     const provider = this.executionContext.getProviderObject()
@@ -74,13 +76,35 @@ export class VMProvider {
           }
         }
       })
-      this.worker.postMessage({
-        cmd: 'init',
-        fork: this.executionContext.getCurrentFork(),
-        nodeUrl: provider?.options['nodeUrl'],
-        blockNumber: provider?.options['blockNumber'],
-        stateDb: stringifiedStateDb
-      })
+      if (stringifiedState) {
+        try {
+          const blockchainState = JSON.parse(stringifiedState)
+          const blocks: Block[] = blockchainState.blocks.map(block => Block.fromRLPSerializedBlock(toBuffer(block)))
+          const blockNumber = toBigInt(blockchainState.latestBlockNumber).toString(10)
+          const stateDb = { 
+            root: toBuffer(blockchainState.root),
+            db: new Map(Object.entries(blockchainState.db))
+          }
+
+          this.worker.postMessage({
+            cmd: 'init',
+            fork: this.executionContext.getCurrentFork(),
+            nodeUrl: provider?.options['nodeUrl'],
+            blockNumber,
+            stateDb,
+            blocks
+          })
+        } catch (e) {
+          console.error(e)
+        }
+      } else {
+        this.worker.postMessage({
+          cmd: 'init',
+          fork: this.executionContext.getCurrentFork(),
+          nodeUrl: provider?.options['nodeUrl'],
+          blockNumber: provider?.options['blockNumber']
+        })
+      }
     })
   }
 

apps/remix-ide/src/blockchain/providers/worker-vm.ts

@@ -1,5 +1,4 @@
 import { Provider } from '@remix-project/remix-simulator'
-import {toBuffer} from '@ethereumjs/util'
 
 let provider: Provider = null
 self.onmessage = (e: MessageEvent) => {
@@ -7,12 +6,7 @@ self.onmessage = (e: MessageEvent) => {
   switch (data.cmd) {
   case 'init': 
   {
-    if (data.stateDb) {
-      data.stateDb = JSON.parse(data.stateDb)
-      data.stateDb.root = toBuffer(data.stateDb.root)
-      data.stateDb.db = new Map(Object.entries(data.stateDb.db))
-    }
-    provider = new Provider({ fork: data.fork, nodeUrl: data.nodeUrl, blockNumber: data.blockNumber, stateDb: data.stateDb })
+    provider = new Provider({ fork: data.fork, nodeUrl: data.nodeUrl, blockNumber: data.blockNumber, stateDb: data.stateDb, blocks: data.blocks})
     provider.init().then(() => {
       self.postMessage({
         cmd: 'initiateResult',

libs/remix-simulator/src/provider.ts

@@ -11,6 +11,7 @@ import { Transactions } from './methods/transactions'
 import { Debug } from './methods/debug'
 import { VMContext } from './vm-context'
 import { Web3PluginBase } from 'web3'
+import { Block } from '@ethereumjs/block'
 
 export interface JSONRPCRequestPayload {
   params: any[];
@@ -36,8 +37,9 @@ export type ProviderOptions = {
   fork: string,
   nodeUrl: string,
   blockNumber: number | 'latest',
-  stateDb: State,
+  stateDb?: State,
   logDetails?: boolean
+  blocks?: Block[]
 }
 
 export class Provider {
@@ -53,7 +55,7 @@ export class Provider {
   constructor (options: ProviderOptions = {} as ProviderOptions) {
     this.options = options
     this.connected = true
-    this.vmContext = new VMContext(options['fork'], options['nodeUrl'], options['blockNumber'], options['stateDb'])
+    this.vmContext = new VMContext(options['fork'], options['nodeUrl'], options['blockNumber'], options['stateDb'], options['blocks'])
 
     this.Accounts = new Web3Accounts(this.vmContext)
     this.Transactions = new Transactions(this.vmContext)
@@ -73,7 +75,7 @@ export class Provider {
     this.pendingRequests = []
     await this.vmContext.init()
     await this.Accounts.resetAccounts()
-    this.Transactions.init(this.Accounts.accounts, this.vmContext.blockNumber)
+    this.Transactions.init(this.Accounts.accounts, this.vmContext.blockNumber, this.vmContext.blocks)
     this.initialized = true
     if (this.pendingRequests.length > 0) {
       this.pendingRequests.map((req) => {

libs/remix-simulator/src/vm-context.ts

@@ -332,8 +332,9 @@ export class VMContext {
   nodeUrl: string
   blockNumber: number | 'latest'
   stateDb: State
+  blocksData: Block[]
 
-  constructor (fork?: string, nodeUrl?: string, blockNumber?: number | 'latest', stateDb?: State) {
+  constructor (fork?: string, nodeUrl?: string, blockNumber?: number | 'latest', stateDb?: State, blocksData?: Block[]) {
     this.blockGasLimitDefault = 4300000
     this.blockGasLimit = this.blockGasLimitDefault
     this.currentFork = fork || 'merge'
@@ -346,6 +347,7 @@ export class VMContext {
     this.txByHash = {}
     this.exeResults = {}
     this.logsManager = new LogsManager()
+    this.blocksData = blocksData
   }
 
   async init () {
@@ -387,8 +389,13 @@ export class VMContext {
         gasLimit: 8000000
       }
     }, { common, hardforkByBlockNumber: false, hardforkByTTD: undefined })
+    let blockchain
 
-    const blockchain = await Blockchain.create({ common, validateBlocks: false, validateConsensus: false, genesisBlock })
+    if (Array.isArray(this.blocksData) && this.blocksData.length > 0) {
+      blockchain = await Blockchain.fromBlocksData(this.blocksData, { common, validateBlocks: false, validateConsensus: false })
+    } else {
+      blockchain = await Blockchain.create({ common, validateBlocks: false, validateConsensus: false, genesisBlock })
+    }
     const eei = new EEI(stateManager, common, blockchain)
     const evm = new EVM({ common, eei, allowUnlimitedContractSize: true })