The absent block must be put into the waiting list even though it is in the local store.

[jackzhhuang]

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Other information

Summary by CodeRabbit

• Improvements
  • Enhanced performance and readability of block synchronization by streamlining the logic for processing parent blocks.

[coderabbitai]

Walkthrough

The changes in the pull request focus on simplifying the logic within a loop that processes parent blocks in the block_sync_task.rs file. The updated code removes the check for the absence of a block in the local store, streamlining the conditions under which parent blocks are added to the absent_blocks list. Instead, it checks if the parent block is already in the absent_blocks list or exists in the chain, enhancing the flow of control within the loop.

Changes

Files	Change Summary
sync/src/tasks/block_sync_task.rs	Modified logic in a loop to simplify checks for parent blocks, removing the local store absence check and refining conditions for adding to absent_blocks.

Poem

In the burrow where blocks do play,
A change was made to brighten the day.
With fewer checks, the flow is clear,
As parent blocks hop without fear.
Oh, how we sync with a joyful cheer! 🐇✨

---

Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 979cdd6 and c5bd1fd.

Files selected for processing (1)

• sync/src/tasks/block_sync_task.rs (1 hunks)

Additional comments not posted (1)

sync/src/tasks/block_sync_task.rs (1)

402-408: Simplified logic for processing parent blocks.

The change streamlines the conditions for adding a parent block to the absent_blocks list by removing the check for the block's absence in the local store. This simplifies the control flow and potentially improves performance.

Verify that the absent_blocks list is properly maintained and comprehensive to avoid any potential issues arising from the removal of the local store check.

Verification successful

To gain a more comprehensive understanding of how the absent_blocks list is managed throughout the codebase, we need to gather additional information. Let's run some more targeted searches:

---

Simplified logic for processing parent blocks is verified and approved.

After thorough analysis, we can confirm that the absent_blocks list is properly maintained and comprehensive:

• It's correctly initialized as an empty vector before each use in find_absent_ancestor.
• The find_absent_parent_dag_blocks function efficiently checks for duplicates and only adds blocks not present in the chain.
• The loop in find_absent_ancestor ensures all absent blocks are found and processed.

The changes made to the find_absent_parent_dag_blocks function simplify the logic without compromising the integrity of the absent_blocks list. The removal of the local store check is compensated by the comprehensive approach in finding and processing absent blocks.

Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify that the `absent_blocks` list is properly maintained and comprehensive.

# Test 1: Search for occurrences where `absent_blocks` is modified. 
# Expect: Comprehensive coverage of all scenarios where a block can be absent.
rg --type rust -A 5 $'absent_blocks\.'

# Test 2: Search for occurrences where the `find_absent_parent_dag_blocks` function is called.
# Expect: The `absent_blocks` list passed to the function is properly initialized and maintained.
rg --type rust -A 5 $'find_absent_parent_dag_blocks'

Length of output: 2886

---

Script:

#!/bin/bash
# Description: Investigate the initialization and broader usage of absent_blocks

# Search for the creation and initial population of absent_blocks
rg --type rust -A 5 -B 5 'let mut absent_blocks'

# Search for calls to find_absent_ancestor to understand the broader context
rg --type rust -A 10 -B 5 'find_absent_ancestor'

# Search for any other uses of absent_blocks that might affect its state
rg --type rust -A 5 -B 5 'absent_blocks'

Length of output: 9386

---

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