feat(prefork): add support for process monitoring and callbacks in prefork mode

[ReneWerner87]

Modified fasthttp version
ReneWerner87/fasthttp@master...ReneWerner87:fasthttp:prefork_optimization
PR to fasthttp is coming

[coderabbitai]

Important

Review skipped

Draft detected.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

• 🔍 Trigger a full review

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch prefork_optimization

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[gemini-code-assist]

Summary of Changes

Hello @ReneWerner87, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly refactors Fiber's prefork implementation by integrating the fasthttp/prefork package. This change introduces robust process monitoring capabilities, including automatic child process recovery, and extends prefork support to custom listeners via a new callback mechanism. The goal is to provide a more stable and flexible prefork experience for Fiber applications.

Highlights

• Integration with fasthttp/prefork: Fiber's internal prefork implementation has been replaced by the more robust fasthttp/prefork package, centralizing prefork logic and leveraging its features.
• Child Process Monitoring and Recovery: The prefork mode now includes built-in monitoring for child process crashes and automatic recovery, configurable via a new PreforkRecoverThreshold in ListenConfig.
• Enhanced Custom Listener Support: The app.Listener() method now fully supports prefork mode through a new OnPreforkServe callback, allowing each child process to create its own reuseport listener, removing a previous limitation.

🧠 New Feature in Public Preview: You can now enable Memory to help Gemini Code Assist learn from your team's feedback. This makes future code reviews more consistent and personalized to your project's style. Click here to enable Memory in your admin console.

Using Gemini Code Assist

The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point by creating a comment using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands on the current page.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in pull request comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

To customize Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counter productive. You can react with 👍 and 👎 on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for Github and other Google products, sign up here.

You can also get AI-powered code generation, chat, as well as code reviews directly in the IDE at no cost with the Gemini Code Assist IDE Extension.

Footnotes

1. Review the Privacy Notices, Generative AI Prohibited Use Policy, Terms of Service, and learn how to configure Gemini Code Assist in GitHub here. Gemini can make mistakes, so double check it and use code with caution. ↩

[gemini-code-assist]

Code Review

This pull request refactors the prefork implementation to leverage fasthttp's native capabilities, introducing OnPreforkServe for custom listeners and PreforkRecoverThreshold for process monitoring. While these are valuable additions, a critical supply chain vulnerability has been identified: the go.mod file replaces a core dependency with a personal fork using a suspicious, future-dated pseudo-version. This practice should be remediated by using official, verified dependencies. Furthermore, there is a critical issue with a missing type definition that will prevent compilation, and an opportunity to refactor duplicated code to enhance maintainability.

[codecov]

Codecov Report

❌ Patch coverage is 65.43210% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.03%. Comparing base (ab05467) to head (d383b0c).
⚠️ Report is 51 commits behind head on main.

Files with missing lines	Patch %	Lines
prefork.go	65.33%	23 Missing and 3 partials ⚠️
listen.go	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4037      +/-   ##
==========================================
- Coverage   91.15%   91.03%   -0.13%     
==========================================
  Files         119      120       +1     
  Lines       11117    11187      +70     
==========================================
+ Hits        10134    10184      +50     
- Misses        625      642      +17     
- Partials      358      361       +3     

Flag	Coverage Δ
unittests	91.03% <65.43%> (-0.13%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.