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Merged
merged 1 commit into from
Apr 25, 2025
Merged

Enforce fixed size read for s3 binlog upload #43

merged 1 commit into from
Apr 25, 2025

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liweiyi88
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@liweiyi88 liweiyi88 commented Apr 25, 2025 •
edited by coderabbitai bot
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Summary by CodeRabbit

  • Bug Fixes
    • Improved reliability when saving binlog files by ensuring only the file content up to its current size is saved, preventing issues if the file is updated during upload.

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coderabbitai bot commented Apr 25, 2025 •
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Walkthrough

The update modifies the process of saving a binlog file by introducing an io.LimitReader that restricts reading to the file size determined at the time of access. This change ensures that only the intended portion of the file is saved, even if the file is being concurrently updated. The modification is localized to the logic that prepares the file reader before invoking the storage's Save method. No changes were made to public interfaces or error handling routines.

Changes

File(s) Change Summary
binlog/binlogsyncer.go Wrapped the binlog file handle in an io.LimitReader using the file's stat size before saving.

Poem

In the warren where binlogs hop and grow,
A LimitReader bounds how far they go.
No more chasing bytes that change mid-flight—
The file’s just right, not a nibble more, nor slight.
With stat in paw, I save with glee,
Consistent binlogs for you and me! 🐇✨

📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
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📥 Commits

Reviewing files that changed from the base of the PR and between 965976a and cde3f79.

📒 Files selected for processing (1)
  • binlog/binlogsyncer.go (2 hunks)
⏰ Context from checks skipped due to timeout of 90000ms (1)
  • GitHub Check: test (1.24.1, windows-latest)
🔇 Additional comments (4)
binlog/binlogsyncer.go (4)

6-6: LGTM: Necessary import for io.LimitReader

The addition of the io package import is appropriate for using io.LimitReader in the code.

42-44: Good documentation of the problem and solution

The comments clearly explain the rationale for using LimitReader - that binlog files can be updated by MySQL during the upload process.

44-44: LGTM: Appropriate use of io.LimitReader

Using io.LimitReader to cap the read size to what was measured at file open time is a good, idiomatic solution for ensuring consistent file uploads when the source file might be concurrently modified.

50-50: LGTM: Correctly uses the limited reader

The change properly passes the limited reader to storage.Save instead of the file handle directly, ensuring only the intended portion of the file is uploaded.

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codecov bot commented Apr 25, 2025 •
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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.66%. Comparing base (965976a) to head (cde3f79).
Report is 1 commits behind head on main.

Additional details and impacted files 
@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
+ Coverage   75.64%   75.66%   +0.02%     
==========================================
  Files          33       33              
  Lines        2373     2375       +2     
==========================================
+ Hits         1795     1797       +2     
  Misses        440      440              
  Partials      138      138

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@liweiyi88 liweiyi88 merged commit bd25ba7 into main Apr 25, 2025
4 checks passed
@liweiyi88 liweiyi88 deleted the fixed-size-binlog-sync branch April 25, 2025 04:46
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