fix: handle events only when event handlers are registered

[hallazzang]

Inside Node.handleNewBlock, blockResult can be nil if n.eventHandlers was empty. But the current code always iterates over blockResult.FinalizeBlockEvents which causes a panic when we run Node without any event handlers. This PR fixes this bug by checking if n.eventHandlers is empty or not before the iteration.

Summary by CodeRabbit

• Improvements
  • Enhanced efficiency in event handling for finalize block events by checking for registered handlers before processing.
  • Maintained existing functionality for block processing while optimizing the event handling logic.

[coderabbitai]

Walkthrough

The changes involve modifications to the handleNewBlock method in the Node struct within node/process.go. The main update is the introduction of a conditional check to determine if any event handlers are registered before processing FinalizeBlockEvents. This adjustment aims to enhance efficiency by avoiding unnecessary event handling when no handlers are present. The overall structure and logic of the blockProcessLooper method remain unchanged, ensuring that existing functionalities related to block processing are preserved.

Changes

File	Change Summary
node/process.go	Modified handleNewBlock to check for registered event handlers before processing FinalizeBlockEvents. No changes to the blockProcessLooper method's overall structure or logic.

Sequence Diagram(s)

sequenceDiagram
    participant Node
    participant EventHandler

    Node->>Node: handleNewBlock()
    alt Event Handlers Registered
        Node->>EventHandler: Process FinalizeBlockEvents
    else No Event Handlers
        Node->>Node: Skip FinalizeBlockEvents Processing
    end

Loading

🐇 "In the code where blocks are made,
A check for handlers now is laid.
If none are there, we skip the fuss,
Efficiency blooms, no need to rush!
With logic clear, the flow stays bright,
Hopping along, all feels just right!" 🌼

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[coderabbitai]

Actionable comments posted: 1

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

📥 Commits

Files that changed from the base of the PR and between 86916b3 and 6700e14.

📒 Files selected for processing (1)

• node/process.go (1 hunks)

🧰 Additional context used

🔇 Additional comments (2)

node/process.go (2)

173-178: Excellent improvement to prevent unnecessary processing and potential panics.

This change effectively addresses the issue mentioned in the PR objectives. By adding a check for registered event handlers before processing FinalizeBlockEvents, you've prevented potential panics when no handlers are present and improved the efficiency of the function.

The modification aligns well with best practices:

1. It follows the "fail-fast" principle by checking preconditions early.
2. It maintains consistency with the existing error handling and logging patterns.
3. It preserves the existing functionality for cases where event handlers are present.

Great job on this improvement!

---

Line range hint 1-278: Overall assessment: Approved with suggestions for future improvements.

The changes made to the handleNewBlock function effectively address the issue described in the PR objectives. The modification is well-implemented, consistent with the existing code style, and improves both the efficiency and robustness of the function.

While the current changes are approved, there are opportunities for future improvements:

1. Refactoring the handleNewBlock function to reduce its complexity and improve maintainability.
2. Considering the extraction of repeated conditions into helper methods.

These suggestions aim to enhance the overall code quality and maintainability in the long term, but they don't detract from the value of the current PR.

Great work on this contribution!

[beer-1]

LGTM