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Fix race condition in stdio.SendRequest with canceled context #503

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Merged
merged 1 commit into from
Jul 22, 2025
Merged

Fix race condition in stdio.SendRequest with canceled context #503

merged 1 commit into from
Jul 22, 2025

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ezynda3
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@ezynda3 ezynda3 commented Jul 22, 2025 •
edited by coderabbitai bot
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Summary

  • Fix race condition where stdio.SendRequest could return nil instead of context.Canceled error
  • Add early context cancellation check before any I/O operations
  • Ensures consistent behavior across different environments (fixes GitHub Actions test failures)

Test plan

  • Run go test -race -v ./client/transport -run TestStdio/SendRequestWithTimeout
  • Verify test passes locally with race detector enabled
  • CI tests should now pass consistently

🤖 Generated with opencode

Summary by CodeRabbit

  • Bug Fixes
    • Improved request handling to immediately stop processing if the operation has already been canceled, resulting in more efficient behavior and faster error reporting in canceled scenarios.

@ezynda3
Fix race condition in stdio.SendRequest with canceled context
345940a 
Add early context cancellation check to prevent race condition where
SendRequest could return nil instead of context.Canceled when called
with an already-canceled context. This issue only manifested in certain
environments like GitHub Actions due to timing differences.

The fix ensures consistent behavior by checking context cancellation
before any I/O operations.

🤖 Generated with [opencode](https://opencode.ai)

Co-Authored-By: opencode <noreply@opencode.ai>
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coderabbitai bot commented Jul 22, 2025 •
edited
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Walkthrough

A preemptive context cancellation check was added at the beginning of the SendRequest method in client/transport/stdio.go. The method now immediately returns with the context's error if the context is already canceled, preventing further processing when the context is no longer valid.

Changes

Files Change Summary
client/transport/stdio.go Added early context cancellation check in SendRequest to avoid unnecessary work if canceled.

Estimated code review effort

1 (~2 minutes)

Possibly related PRs

Suggested reviewers

  • pottekkat
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📥 Commits

Reviewing files that changed from the base of the PR and between 7c38b56 and 345940a.

📒 Files selected for processing (1)
  • client/transport/stdio.go (1 hunks)
🔇 Additional comments (1)
client/transport/stdio.go (1)

310-315: Excellent fix for the race condition issue!

The preemptive context cancellation check effectively addresses the race condition described in the PR objectives. This ensures that ctx.Err() (likely context.Canceled) is consistently returned instead of potentially returning nil when the context is already canceled before any I/O operations begin.

The implementation follows Go best practices and prevents unnecessary work (marshaling, channel registration, I/O operations) when the context is already done.

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@ezynda3 ezynda3 merged commit 5800c20 into main Jul 22, 2025
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