op-node: batch-decoder: Support ecotone

[pcw109550]

Description

From ecotone, batches may written to blobs.

Now batch decoder can read blob transactions and parse channel frames, updating fetch command. Previously the batch decoder code assumed that single batch tx contained single channel frames. This PR updates TransactionWithMetadata struct to support multiple frames from blobs.

New optional flag: --l1.beacon. If this flag is not provided, ignore blobs in batch transactions.

Tests

Manually tested.

• Post ecotone batches are decoded correctly when --l1.beacon is set.
• Pre ecotone batches are decoded correctly w/wo --l1.beacon.
• Post ecotone batches are ignored when --l1.beacon is not set.
• Early return when --l1.beacon is incorrectly set.

Example command for op-mainnet:

go run main.go fetch --start=19887269 --end=19887509 --inbox 0xFF00000000000000000000000000000000000010 --out ./artifacts/op-mainnet/transactions_cache --sender 0x6887246668a3b87F54DeB3b94Ba47a6f63F32985 --l1=[L1] --l1.beacon=[L1_BEACON]

Partial output:

Fetched batches in range [19887269,19887509). Found 5 valid & 6 invalid batches
Fetch Config: Chain ID: 1. Inbox Address: 0xFF00000000000000000000000000000000000010. Valid Senders: map[0x6887246668a3b87F54DeB3b94Ba47a6f63F32985:{}].
Wrote transactions with batches to ./artifacts/op-mainnet/transactions_cache

Where those five batches are from consecutive five ecotone batches:

• https://etherscan.io/block/19887270
• https://etherscan.io/block/19887333
• https://etherscan.io/block/19887389
• https://etherscan.io/block/19887449
• https://etherscan.io/block/19887508

[coderabbitai]

Walkthrough

Walkthrough

The recent changes introduce significant enhancements to the batch_decoder functionality in the op-node project. Key updates include the addition of new imports, modifications to the TransactionWithMetadata struct, and updates to function signatures to incorporate a new L1BeaconClient for handling blob transactions. Additionally, the main.go file has been updated to support a new l1.beacon flag, create a L1BeaconClient, and adapt the Batches function to utilize this new client.

Changes

File Path	Change Summary
op-node/cmd/batch_decoder/fetch/fetch.go	Added imports for eth, sources, and hexutil. Updated TransactionWithMetadata struct. Modified Batches and fetchBatchesPerBlock function signatures to include beacon parameter. Added handling for blob transactions using L1 Beacon API.
op-node/cmd/batch_decoder/main.go	Added imports for client and sources. Introduced l1.beacon flag. Created L1BeaconClient and updated Batches function to use it. Renamed client variable to l1Client and added conditional logic for l1.beacon address handling.

---

Recent Review Details

Configuration used: .coderabbit.yml
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 943ed0f and 582f3e1.

Files selected for processing (2)

• op-node/cmd/batch_decoder/fetch/fetch.go (9 hunks)
• op-node/cmd/batch_decoder/main.go (3 hunks)

Additional comments not posted (7)

op-node/cmd/batch_decoder/fetch/fetch.go (3)

15-18: Added imports for eth, sources, and hexutil are appropriate for the new functionality.

---

34-35: The change from single fields to slices in TransactionWithMetadata struct allows handling multiple frames, aligning with the PR's objective to support ecotone.

---

Line range hint 51-67: The updated Batches function now includes a beacon parameter to handle blob transactions. Ensure that all calls to this function are updated to pass the new parameter.

Verification successful

---

Verification of Batches Function Call Update

The call to the Batches function in op-node/cmd/batch_decoder/main.go has been correctly updated to include the new beacon parameter.

• File: op-node/cmd/batch_decoder/main.go
  • Line: totalValid, totalInvalid := fetch.Batches(l1Client, beacon, config)

This confirms that the necessary update has been made.

Scripts Executed

The following scripts were executed for the analysis:

---

Script:

#!/bin/bash
# Description: Verify all function calls to `Batches` include the new `beacon` parameter.

# Test: Search for the function usage. Expect: Only occurrences of the new signature.
rg --type go $'Batches'

Length of output: 43931

op-node/cmd/batch_decoder/main.go (4)

15-16: Added imports for client and sources are necessary for the new L1 Beacon client functionality.

---

62-67: Introduction of the l1.beacon flag is consistent with the PR's objective to optionally use the L1 Beacon node. The flag is optional, aligning with the functionality described.

---

75-97: The initialization of beacon based on the l1.beacon flag is correctly implemented. Error handling in the initialization could be improved by not using log.Fatal for a more graceful shutdown process.

- log.Fatal(fmt.Errorf("failed to check L1 Beacon API version: %w", err))
+ log.Printf("failed to check L1 Beacon API version: %v", err)
+ return err

Skipped due to learnings

User: tynes
PR: ethereum-optimism/optimism#8778
File: op-node/node/node.go:296-309
Timestamp: 2024-01-03T22:46:08.123Z
Learning: The error message in the `initL1BeaconAPI` function within `node.go` should reference the L1 beacon client setup, not the L2 execution-engine RPC client.

---

109-109: Ensure that the Batches function is called with the correct parameters, including the potentially uninitialized beacon when the l1.beacon flag is not set. This is handled correctly as per the changes.

---

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[coderabbitai]

Actionable comments posted: 0

Out of diff range and nitpick comments (1)

op-node/cmd/batch_decoder/fetch/fetch.go (1)

Line range hint 83-191: Significant changes in fetchBatchesPerBlock to handle blob transactions based on the presence of the beacon client. The logic to handle different transaction types and errors is well-structured. However, consider handling errors without terminating the program using log.Fatal to allow more graceful error handling and recovery.

- log.Fatal(fmt.Errorf("failed to fetch blobs: %w", err))
+ log.Printf("failed to fetch blobs: %v", err)
+ return 0, 0, err