Fix fifocache evict

[LeftHandCold]

User description

What type of PR is this?

• API-change
• BUG
• Improvement
• Documentation
• Feature
• Test and CI
• Code Refactoring

Which issue(s) this PR fixes:

issue #16443

What this PR does / why we need it:

When the cache evicts, although the values in cache's shards are deleted,
there are still references in queue1, so fix.

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PR Type

Bug fix

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Description

• Fixed an issue in the FIFO cache eviction process where dequeued values were not reset, causing lingering references in the queue.
• Ensured that the dequeued value is set to its zero value after removal.

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Changes walkthrough 📝

	Relevant files
Bug fix	queue.go Fix lingering references in FIFO cache eviction                    pkg/fileservice/fifocache/queue.go Reset the dequeued value to its zero value to ensure no lingering references. +2/-0

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💡 PR-Agent usage:
Comment /help on the PR to get a list of all available PR-Agent tools and their descriptions

[codiumai-pr-agent-pro]

PR Review 🔍

⏱️ Estimated effort to review [1-5]	2, because the changes are minimal and localized to a specific function in one file, but understanding the context of cache operations and the implications of the fix requires some domain knowledge.
🧪 Relevant tests	No
⚡ Possible issues	Possible Bug: The fix sets the dequeued value to its zero value, which is correct for clearing references. However, ensure that this does not unintentionally affect other parts of the system where the dequeued value might still be expected to be accessible or used.
🔒 Security concerns	No

[codiumai-pr-agent-pro]

PR Code Suggestions ✨

Category	Suggestion	Score
Possible bug	Add a boundary check to prevent out-of-bounds errors Consider adding a check to ensure that p.tail.begin does not exceed the length of p.tail.values to avoid potential out-of-bounds errors. pkg/fileservice/fifocache/queue.go [89] p.tail.begin++ +if p.tail.begin >= len(p.tail.values) { + p.tail.begin = 0 +} Suggestion importance[1-10]: 8 Why: This suggestion is crucial for preventing potential runtime errors due to out-of-bounds access, which is a common issue in array manipulations.	8
	Add a nil check for p.tail to prevent potential nil pointer dereference Consider adding a check to ensure that p.tail is not nil before accessing its properties to avoid potential nil pointer dereference. pkg/fileservice/fifocache/queue.go [86] -ret = p.tail.values[p.tail.begin] +if p.tail != nil { + ret = p.tail.values[p.tail.begin] +} Suggestion importance[1-10]: 7 Why: This suggestion addresses a critical safety issue by preventing a possible nil pointer dereference, which could lead to a runtime panic.	7
Enhancement	Use the zero value directly instead of creating a new variable Instead of creating a new variable zero, consider using the zero value directly to improve code readability. pkg/fileservice/fifocache/queue.go [87-88] -var zero T -p.tail.values[p.tail.begin] = zero +p.tail.values[p.tail.begin] = *new(T) Suggestion importance[1-10]: 6 Why: Using the zero value directly can enhance code readability and efficiency by avoiding unnecessary variable declaration.	6
Maintainability	Add a comment to explain the purpose of resetting the value to its zero value Add a comment explaining why the value at p.tail.begin is being reset to its zero value to improve code maintainability. pkg/fileservice/fifocache/queue.go [88] +// Reset the value at p.tail.begin to its zero value to avoid memory leaks p.tail.values[p.tail.begin] = zero Suggestion importance[1-10]: 4 Why: Adding a comment improves maintainability by making the code's intention clearer, though it's a relatively minor enhancement.	4