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Do not panic on nil io #446

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Do not panic on nil io #446

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@sam-at-luther sam-at-luther commented Jun 25, 2025 •
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Description

Avoid panic on close when io unset.

Type of Change

  • [x ] Bug fix (non-breaking change that fixes an issue)
  • New feature (non-breaking change that adds functionality)
  • MCP spec compatibility implementation
  • Breaking change (fix or feature that would cause existing functionality to not work as expected)
  • Documentation update
  • Code refactoring (no functional changes)
  • Performance improvement
  • Tests only (no functional changes)
  • Other (please describe):

Checklist

  • [x ] My code follows the code style of this project
  • I have performed a self-review of my own code
  • [ n/a] I have added tests that prove my fix is effective or that my feature works
  • [ n/a] I have updated the documentation accordingly

MCP Spec Compliance

  • This PR implements a feature defined in the MCP specification
  • Link to relevant spec section: Link text
  • Implementation follows the specification exactly

Additional Information

Summary by CodeRabbit

  • Bug Fixes
    • Improved stability by preventing potential errors when closing input and error streams, ensuring the application no longer panics if these streams are unavailable.

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coderabbitai bot commented Jun 25, 2025 •
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Walkthrough

The Close method in the Stdio struct was updated to include nil checks before attempting to close the stdin and stderr streams. This prevents potential panics if either stream is nil. The rest of the method's logic and error handling remain unchanged.

Changes

Files Change Summary
client/transport/stdio.go Added nil checks before closing stdin and stderr streams in the Close method.

Warning

There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure.

🔧 golangci-lint (1.64.8)

Error: you are using a configuration file for golangci-lint v2 with golangci-lint v1: please use golangci-lint v2
Failed executing command with error: you are using a configuration file for golangci-lint v2 with golangci-lint v1: please use golangci-lint v2

📜 Recent review details

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📥 Commits

Reviewing files that changed from the base of the PR and between 8f5b048 and b053093.

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

137-146: LGTM! Solid bug fix that prevents panic on nil io resources.

The nil checks correctly address the scenario where Close() might be called before Start() or after Start() fails, leaving stdin and stderr uninitialized. The implementation maintains consistency with existing error handling patterns and other nil checks already present in the codebase (e.g., SendRequest and SendNotification methods).

The fix is minimal, non-breaking, and directly addresses the panic issue described in the PR objectives.

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