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@lispc lispc commented Jul 23, 2025

Purpose or design rationale of this PR

Describe your change. Make sure to answer these three questions: What does this PR do? Why does it do it? How does it do it?

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  • No, this PR doesn't involve a new deployment, git tag, docker image tag
  • Yes

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  • No, this PR is not a breaking change
  • Yes

Summary by CodeRabbit

  • Bug Fixes
    • Improved reliability by ensuring the previous state root is always set, even when no previous witness is provided. The system now retrieves the parent block’s state root as a fallback, enhancing consistency in witness building.
  • Chores
    • Updated the version tag to v4.5.33.

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coderabbitai bot commented Jul 23, 2025

Walkthrough

The change updates the logic in rpc_client.rs to fetch and use the parent block's state root as the previous state root when no previous witness is provided. If a previous witness exists, its state root is used as before. No changes were made to public or exported entity declarations. Additionally, the version tag in common/version/version.go was updated from "v4.5.32" to "v4.5.33".

Changes

File(s) Change Summary
crates/l2geth/src/rpc_client.rs Modified logic to retrieve the parent block's state root as a fallback when no previous witness exists.
common/version/version.go Updated version tag string constant from "v4.5.32" to "v4.5.33".

Sequence Diagram(s)

sequenceDiagram
    participant Caller
    participant RpcClient
    participant BlockHeader
    participant ParentBlock

    Caller->>RpcClient: build_witness(current_block, prev_witness)
    alt prev_witness exists
        RpcClient->>RpcClient: Use prev_witness.state_root
    else prev_witness is None
        RpcClient->>BlockHeader: Get parent_hash from current_block.header
        RpcClient->>ParentBlock: Fetch parent block by parent_hash
        RpcClient->>RpcClient: Use parent_block.state_root
    end
    RpcClient->>Caller: Return witness with previous state root
Loading

Estimated code review effort

1 (~5 minutes)

Possibly related PRs

  • upgrade circuit to 0.5.2 #1703: Refactors witness building logic in rpc_client.rs and modifies handling of previous state root, closely related to the changes in this PR.

Suggested labels

bump-version

Poem

A clever code hop in the l2geth glen,
Now finds the parent’s root again.
If a witness is missing, don’t worry or fret—
The state root’s retrieved, the builder is set.
With hashes and hops, the logic is sound,
Another smooth leap where bugs won’t be found! 🐇


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  • common/version/version.go (1 hunks)
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  • common/version/version.go
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@georgehao georgehao marked this pull request as ready for review July 23, 2025 05:47
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Actionable comments posted: 0

🧹 Nitpick comments (1)
crates/l2geth/src/rpc_client.rs (1)

124-143: Improve error handling for parent block fetch.

The fallback logic is sound and correctly implements fetching the parent block's state root when no previous witness is provided. However, consider improving error handling instead of using expect.

-                None => {
-                    let parent_block = provider
-                        .get_block_by_hash(parent_hash)
-                        .await?
-                        .expect("parent block should exist");
-
-                    parent_block.header.state_root
-                }
+                None => {
+                    let parent_block = provider
+                        .get_block_by_hash(parent_hash)
+                        .await?
+                        .ok_or_else(|| eyre::eyre!("Parent block {parent_hash} not found"))?;
+
+                    parent_block.header.state_root
+                }
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📥 Commits

Reviewing files that changed from the base of the PR and between 67b0555 and f14cb52.

📒 Files selected for processing (1)
  • crates/l2geth/src/rpc_client.rs (2 hunks)
🔇 Additional comments (2)
crates/l2geth/src/rpc_client.rs (2)

114-114: LGTM! Parent hash extraction is correct.

The extraction of parent_hash from the block header is necessary for the new fallback logic and follows standard blockchain patterns.


144-144: LGTM! Witness builder configuration is correct.

Setting the prev_state_root on the witness builder ensures it always has a valid previous state root, either from the provided witness or the parent block.

@georgehao georgehao added the bump-version Bump the version tag for deployment label Jul 23, 2025
@georgehao georgehao merged commit daa1387 into develop Jul 23, 2025
1 check passed
@georgehao georgehao deleted the feat/circuit-0.5.2 branch July 23, 2025 06:16
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