feat(dir-metadata-prefetch): create readObjectsUnlocked function + refactoring of existing code

[ashmeenkaur]

Description

This PR refactors the directory reading logic by introducing a new readObjectsUnlocked function to perform GCS I/O without holding the directory lock. This will allow for for more concurrent operations by minimizing lock contention during potentially long-running List calls which will become more frequent as we add dir-metadata-prefetch feature.

It also migrates the test suite from ogletest to the more standard testify/suite, which improves maintainability.

Link to the issue in case of a bug fix.

b/473411326

Testing details

1. Manual - NA
2. Unit tests - Added
3. Integration tests - via KOKORO

Any backward incompatible change? If so, please explain.

NA

[ashmeenkaur]

/gemini summary

[ashmeenkaur]

/gemini review

[gemini-code-assist]

Summary of Changes

This pull request introduces a significant refactoring to the directory inode's object reading mechanism, primarily by separating the GCS I/O from the cache update logic. A new readObjectsUnlocked function allows for more concurrent operations by minimizing lock contention during potentially long-running GCS calls. The changes also include a comprehensive update of the associated test file to use the testify assertion library, enhancing test readability and maintainability.

Highlights

• New Functionality: Introduced a new readObjectsUnlocked function in dir.go designed to perform GCS I/O operations without holding a lock on the directory inode, improving concurrency. The lock is only acquired briefly to update the cache.
• Refactoring: The existing readObjects function was refactored and renamed to listObjectsAndBuildCores. This new helper function now encapsulates the common logic for listing objects and building core metadata, separating it from the cache insertion logic.
• Helper Function: A new private helper function insertToCache was added to centralize the logic for inserting object metadata into the directory's type cache.
• Testing Framework Update: The test suite in dir_test.go was migrated from oglematchers and ogletest to github.com/stretchr/testify (specifically assert, require, and suite), leading to more idiomatic Go testing practices and clearer assertions.
• New Test Cases: Added dedicated test cases (Test_ReadObjectsUnlocked and Test_readObjectsUnlocked_Empty) to thoroughly validate the behavior and locking mechanism of the newly introduced readObjectsUnlocked function.

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Changelog

• internal/fs/inode/dir.go
  • Renamed readObjects to listObjectsAndBuildCores to better reflect its purpose as a GCS listing and core building helper.
  • Created a new insertToCache function to encapsulate cache insertion logic.
  • Implemented readObjectsUnlocked which calls listObjectsAndBuildCores and then acquires a lock to call insertToCache.
  • Modified the original readObjects to utilize the new listObjectsAndBuildCores and insertToCache functions.
• internal/fs/inode/dir_test.go
  • Replaced oglematchers and ogletest imports with github.com/stretchr/testify/assert, require, and suite.
  • Updated test suite setup methods (SetUp, TearDown) to SetupTest and TearDownTestSuite for testify compatibility.
  • Converted all existing assertions from AssertEq, ExpectEq, AssertNe, ExpectNe, AssertTrue, ExpectTrue, AssertFalse, ExpectFalse, ExpectThat to their testify equivalents (require.NoError, assert.Equal, require.NotNil, assert.EqualValues, require.True, assert.True, require.False, assert.False, assert.ErrorContains, assert.ElementsMatch).
  • Renamed all test functions to follow the Test<FunctionName> convention required by testify.
  • Added new test cases Test_ReadObjectsUnlocked and Test_readObjectsUnlocked_Empty to verify the functionality of the new readObjectsUnlocked method.

Activity

• The author ashmeenkaur requested a summary of the pull request.

[gemini-code-assist]

Code Review

This pull request refactors the directory object reading logic by introducing a new readObjectsUnlocked function to perform GCS I/O without holding the directory lock, which is a good performance improvement. It also migrates the test suite from ogletest to the more standard testify/suite, which improves maintainability. However, the refactoring in dir.go has introduced a critical race condition and a redundant operation due to incomplete removal of old logic. The tests have also been updated accordingly, but there's a minor typo in one of the test names.

[codecov]

Codecov Report

❌ Patch coverage is 78.94737% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.13%. Comparing base (8985dad) to head (039fc04).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/fs/inode/dir.go	78.94%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4240      +/-   ##
==========================================
+ Coverage   83.09%   83.13%   +0.03%     
==========================================
  Files         154      154              
  Lines       18980    18994      +14     
==========================================
+ Hits        15772    15791      +19     
+ Misses       2631     2627       -4     
+ Partials      577      576       -1     

Flag	Coverage Δ
unittests	83.13% <78.94%> (+0.03%)	⬆️

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[github-actions]

Hi @vadlakondaswetha, your feedback is needed to move this pull request forward. This automated reminder was triggered because there has been no activity for over 24 hours. Please provide your input when you have a moment. Thank you!