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fix: race by deferring the return of buf to sync.Pool when using RawBody #542

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merged 2 commits into from
Aug 15, 2024

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nunoo
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@nunoo nunoo commented Aug 14, 2024

You are still using the result of buf.Bytes() in body, later in this function. This defers until completion. Alternatively we can make body a copy of the bytes from the buffer.

https://www.captaincodeman.com/golang-buffer-pool-gotcha#the-gotcha---were-still-using-it

Summary by CodeRabbit

  • Chores

    • Improved resource management in the registration process by optimizing buffer handling.
    • Enhanced control flow and error handling through the use of deferred execution for cleanup.
  • Tests

    • Added a new test function to evaluate race conditions for concurrent API requests, improving the reliability of the API under high load.

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coderabbitai bot commented Aug 14, 2024

Walkthrough

The changes enhance resource management and testing capabilities in the codebase. The Register function in huma.go now employs defer for buffer handling, ensuring efficient cleanup based on context. Additionally, a new test function in huma_test.go introduces concurrent testing to identify potential race conditions, improving the robustness of the API under load.

Changes

Files Change Summary
huma.go, huma_test.go Updated the Register function to use defer for buffer management, and added TestBodyRace to test for race conditions in concurrent requests.

Poem

🐰 In the meadow where soft bunnies play,
A buffer’s reset starts a new day.
With defer we manage, no leaks in sight,
Cleanup is smart; everything feels right!
Hooray for the changes that keep things neat,
In the code's gentle dance, we hop on our feet! 🌼


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Actionable comments posted: 0

Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 5c12ecb and 0534ce8.

Files selected for processing (1)
  • huma.go (1 hunks)
Additional comments not posted (1)
huma.go (1)

1295-1296: Use of defer for buffer management is appropriate.

The changes to use defer for bufPool.Put(buf) and buf.Reset() ensure that the buffer is properly reset and returned to the pool, regardless of how the function exits. This improves resource management and reduces the risk of resource leaks.

@danielgtaylor danielgtaylor added the bug Something isn't working label Aug 15, 2024
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codecov bot commented Aug 15, 2024

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.75%. Comparing base (5c12ecb) to head (6ca70c3).
Report is 3 commits behind head on main.

Additional details and impacted files
@@           Coverage Diff           @@
##             main     #542   +/-   ##
=======================================
  Coverage   92.74%   92.75%           
=======================================
  Files          22       22           
  Lines        3872     3876    +4     
=======================================
+ Hits         3591     3595    +4     
  Misses        236      236           
  Partials       45       45           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

@danielgtaylor danielgtaylor changed the title Defer buf fix: race by deferring the return of buf to sync.Pool when using RawBody Aug 15, 2024
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Actionable comments posted: 0

Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between 0534ce8 and 6ca70c3.

Files selected for processing (2)
  • huma.go (1 hunks)
  • huma_test.go (1 hunks)
Files skipped from review as they are similar to previous changes (1)
  • huma.go
Additional comments not posted (1)
huma_test.go (1)

2163-2185: LGTM! Verify the correctness of RawBody modification.

The test setup for detecting race conditions looks good. Ensure that modifying RawBody is intentional and does not affect other tests or production code.

Consider verifying that the RawBody modification is safe and does not introduce unintended side effects.

Verification successful

Modification of RawBody is safe and confined to tests.

The modification of RawBody in the TestBodyRace function is isolated to test scenarios and does not affect production code. This approach effectively tests for race conditions without introducing side effects.

  • The RawBody field is primarily used in test files (huma_test.go).
  • The production code (huma.go) handles RawBody without modifications leading to race conditions.
Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify the usage of `RawBody` in the codebase to ensure safe modification.

# Test: Search for `RawBody` usage. Expect: Only test-related modifications.
rg --type go -A 5 $'RawBody'

Length of output: 7860

@danielgtaylor
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@nunoo thank you for the PR! I added a commit with a test to trigger the issue, and slightly modified your fix to only apply when RawBody is in use, so when using a just the normal body struct we get a slight performance improvement by being able to re-use the buffer earlier. This will go into the next release in a few days. 👍

@danielgtaylor danielgtaylor merged commit b13a422 into danielgtaylor:main Aug 15, 2024
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@nunoo
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nunoo commented Aug 15, 2024

@danielgtaylor thanks for the quick review and additional context to the changes you made! I'm excited to have contributed to the code base!

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500 errors with "cannot read request body" Data race when consuming input RawBody
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