add arbitrum decoder

l2beat · Jan 19, 2024 · e016b0c · e016b0c
1 parent dcbb2af
commit e016b0c
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Showing 3 changed files with 35 additions and 3 deletions.
diff --git a/packages/optimism-decoder/src/analyze.ts b/packages/optimism-decoder/src/analyze.ts
@@ -11,10 +11,12 @@ const ctcMapping: Record<string, string | undefined> = {
   '0x6F54Ca6F6EdE96662024Ffd61BFd18f3f4e34DFf': 'Zora',
   '0xC1B90E1e459aBBDcEc4DCF90dA45ba077d83BFc5': 'PGN',
   '0xFF00000000000000000000000000000000000010': 'OPMainnet',
-  '0x253887577420Cb7e7418cD4d50147743c8041b28': 'Aevo'
+  '0x253887577420Cb7e7418cD4d50147743c8041b28': 'Aevo',
+  '0x1c479675ad559DC151F6Ec7ed3FbF8ceE79582B6': 'Arbitrum',
 }
 
 const typeMapping: Record<string, string | undefined> = {
+  Arbitrum: 'Arbitrum',
   Lyra: 'OpStack',
   Base: 'OpStack',
   Zora: 'OpStack',

diff --git a/packages/optimism-decoder/src/decode.ts b/packages/optimism-decoder/src/decode.ts
@@ -24,6 +24,34 @@ interface AppendSequencerBatchParams {
   transactions: string[] // total_size_bytes[], total_size_bytes[]
 }
 
+export async function decodeArbitrumBatch(
+  kind: string,
+  data: string,
+  fourBytesApi: FourBytesApi,
+) {
+  console.log('Decoding Arbitrum...')
+  const abi = [
+    'function addSequencerL2BatchFromOrigin(uint256 sequenceNumber,bytes data,uint256 afterDelayedMessagesRead,address gasRefunder,uint256 prevMessageCount,uint256 newMessageCount)',
+  ]
+  const iface = new ethers.utils.Interface(abi)
+  const decodedArgs = iface.decodeFunctionData(data.slice(0, 10), data)
+  console.log(decodedArgs.data.slice(2, 4)) // removing 0x, next byte is type of compressed data
+  let brotliCompressedData = Buffer.from(data.slice(4), 'hex')
+  try {
+    let decompressedData = zlib.brotliDecompressSync(brotliCompressedData, {
+      //TODO: No idea what are the correct params
+      params: {
+        [zlib.constants.BROTLI_PARAM_MODE]: zlib.constants.BROTLI_MODE_GENERIC,
+        [zlib.constants.BROTLI_PARAM_QUALITY]:
+          zlib.constants.BROTLI_MAX_QUALITY,
+      },
+    })
+    console.log('Decompressed data:', decompressedData.toString())
+  } catch (err) {
+    console.error('An error occurred:', err)
+  }
+}
+
 export async function decodeOpStackSequencerBatch(
   kind: string,
   data: string,

diff --git a/packages/optimism-decoder/src/run.ts b/packages/optimism-decoder/src/run.ts
@@ -2,7 +2,7 @@ import dotenv from 'dotenv'
 import { ethers } from 'ethers'
 
 import { analyzeTransaction } from './analyze'
-import { decodeSequencerBatch, decodeOpStackSequencerBatch } from './decode'
+import { decodeSequencerBatch, decodeOpStackSequencerBatch, decodeArbitrumBatch } from './decode'
 import { FourBytesApi } from './FourBytesApi'
 
 function getEnv(key: string) {
@@ -46,5 +46,7 @@ export async function run() {
   if (kind === 'OpStack') {
     await decodeOpStackSequencerBatch(project, data, timestamp, fourBytesApi)
     console.log('Batch submission timestamp:', timestamp)
-  } else await decodeSequencerBatch(project, data, fourBytesApi)
+  } else if (kind === 'Arbitrum')
+    await decodeArbitrumBatch(project, data, fourBytesApi)
+  else await decodeSequencerBatch(project, data, fourBytesApi)
 }