fix(sync service): skip messages with lower index

[jonastheis]

1. Purpose or design rationale of this PR

This PR adds skipping for already existing L1 messages if the received message is equal to the already stored one. This allows us to reset SyncedL1BlockNumber to a lower value and simply "replaying" the L1Messages. This is needed for nodes upgrading too late to EuclidV2:

go-ethereum/rollup/sync_service/sync_service.go

Line 87 in 3186613

if genesisConfig.IsEuclidV2(uint64(time.Now().Unix())) &&

2. PR title

Your PR title must follow conventional commits (as we are doing squash merge for each PR), so it must start with one of the following types:

• fix: A bug fix

3. Deployment tag versioning

Has the version in params/version.go been updated?

• Yes

4. Breaking change label

Does this PR have the breaking-change label?

• This PR is not a breaking change

Summary by CodeRabbit

Summary by CodeRabbit

• Bug Fixes

  • Enhanced message synchronization reliability with improved error handling.
  • Updated processing checks to detect unexpected message ordering and manage duplicate messages for consistent data processing.
  • Improved control flow for writing messages to the database after duplicate checks.

• Chores

  • Incremented the patch version from 20 to 21 to reflect the latest updates.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

The changes in the fetchMessages function of the SyncService enhance message processing logic. The queue index check has been modified from an equality check to a greater-than check, allowing for better handling of unexpected queue indices. New logic for managing duplicate queue indices has been introduced, including logging and message comparison against stored entries. Additionally, messages are now encoded using RLP before being written to the database. New imports for bytes and RLP encoding have been added.

Changes

File	Changes Summary
rollup/.../sync_service.go	Updated fetchMessages to change queue index check from equality to greater-than; added duplicate message handling with logging and database comparison; modified message writing to include RLP encoding; new imports for bytes and RLP added.
params/version.go	Updated VersionPatch constant from 20 to 21.

Suggested reviewers

• Thegaram
• omerfirmak

Possibly related PRs

• feat(MessageQueueV2): add reading of MessageQueueV2 and transition logic from V1 to V2 for EuclidV2 #1108: The changes in the main PR regarding the fetchMessages function in the SyncService class, which involve handling both V1 and V2 messages, are directly related to the modifications in the retrieved PR that also focus on transitioning from V1 to V2 message handling in the context of the EuclidV2 fork. Both PRs address the logic for processing messages based on their version, indicating a strong connection at the code level.

Poem

In my burrow, I hop with glee,
Changes abound for all to see.
Queue indices dance under my keen sight,
Duplicates go awry, yet the logic is right.
RLP leaps in with a coding twist,
A joyful bunny sings—syncing bliss!
🐰💻

---

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Reviewing files that changed from the base of the PR and between 3a795b9 and 548496b.

📒 Files selected for processing (1)

• params/version.go (1 hunks)

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[coderabbitai]

Actionable comments posted: 0

🧹 Nitpick comments (2)

rollup/sync_service/sync_service.go (2)

283-289: Revisit queueIndex increment before comparison.
Incrementing queueIndex prior to checking for a mismatch could introduce off-by-one errors when unexpected queue indices appear. Consider verifying the incoming index first or gracefully handling surges in msg.QueueIndex without immediately aborting the sync.

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290-309: Handle RLP mismatch more gracefully.
If the stored and received messages differ, the code currently logs an error and halts the entire sync. You might want to skip or quarantine only the problematic message to avoid blocking the entire syncing process.

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 3186613 and 3a795b9.

📒 Files selected for processing (1)

• rollup/sync_service/sync_service.go (3 hunks)

⏰ Context from checks skipped due to timeout of 90000ms (1)

• GitHub Check: test

🔇 Additional comments (3)

rollup/sync_service/sync_service.go (3)

4-4: No issues with this new import.
The bytes package is correctly used for binary data comparisons below and doesn't introduce any concerns.

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19-19: RLP import usage is valid.
The rlp package is used appropriately for message encoding and error-checking.

---

311-313: Correct placement of database write.
Persisting the message right after the duplicate checks ensures consistency. This approach looks good.