Add script to check state roots

integration-tests/hardhat.config.ts

@@ -4,6 +4,7 @@ import { HardhatUserConfig } from 'hardhat/types'
 import '@nomiclabs/hardhat-ethers'
 import '@nomiclabs/hardhat-waffle'
 import 'hardhat-gas-reporter'
+import './tasks/check-state-roots'
 import { envConfig } from './test/shared/utils'
 
 const enableGasReport = !!process.env.ENABLE_GAS_REPORT

integration-tests/tasks/check-state-roots.ts

+import { task } from 'hardhat/config'
+import { providers } from 'ethers'
+import { die, logStderr } from '../test/shared/utils'
+
+task(
+  'check-state-roots',
+  'Compares the state roots for two different replicas.'
+)
+  .addPositionalParam('replicaA', 'The first replica')
+  .addPositionalParam('replicaB', 'The second replica')
+  .setAction(async ({ replicaA, replicaB }) => {
+    const providerA = new providers.JsonRpcProvider(replicaA)
+    const providerB = new providers.JsonRpcProvider(replicaB)
+
+    let netA
+    let netB
+    try {
+      netA = await providerA.getNetwork()
+    } catch (e) {
+      console.error(`Error getting network from ${replicaA}:`)
+      die(e)
+    }
+    try {
+      netB = await providerA.getNetwork()
+    } catch (e) {
+      console.error(`Error getting network from ${replicaB}:`)
+      die(e)
+    }
+
+    if (netA.chainId !== netB.chainId) {
+      die('Chain IDs do not match')
+      return
+    }
+
+    logStderr('Getting block height.')
+    const heightA = await providerA.getBlockNumber()
+    const heightB = await providerB.getBlockNumber()
+    const endHeight = Math.min(heightA, heightB)
+    logStderr(`Chose block height: ${endHeight}`)
+
+    for (let n = endHeight; n >= 1; n--) {
+      const blocks = await Promise.all([
+        providerA.getBlock(n),
+        providerB.getBlock(n),
+      ])
+
+      const hashA = blocks[0].hash
+      const hashB = blocks[1].hash
+      if (hashA !== hashB) {
+        console.log(`HASH MISMATCH! block=${n} a=${hashA} b=${hashB}`)
+        continue
+      }
+
+      console.log(`HASHES OK! block=${n} hash=${hashA}`)
+      return
+    }
+  })

integration-tests/test/shared/utils.ts

@@ -264,3 +264,12 @@ export const isHardhat = async () => {
   const chainId = await l1Wallet.getChainId()
   return chainId === HARDHAT_CHAIN_ID
 }
+
+export const die = (...args) => {
+  console.log(...args)
+  process.exit(1)
+}
+
+export const logStderr = (msg: string) => {
+  process.stderr.write(`${msg}\n`)
+}