feat(prefork): delegate to fasthttp/prefork to eliminate code duplication by ReneWerner87 · Pull Request #4210 · gofiber/fiber

ReneWerner87 · 2026-04-11T19:33:00Z

Summary

Replaces previous PR #4037 (accidentally merged via branch tracking misconfiguration).

Replace Fiber's own prefork implementation with fasthttp's prefork package
Eliminate ~100 lines of duplicated process management logic
Add PreforkRecoverThreshold to ListenConfig for configurable child recovery
Add PreforkLogger to ListenConfig for configurable prefork logging
IsChild() delegates to prefork.IsChild()
Callbacks (OnChildSpawn, OnMasterReady, OnChildRecover) integrate Fiber's hooks
New prefork_logger.go with PreforkLoggerInterface

Depends on

https://github.com/ReneWerner87/fasthttp (prefork_optimization branch) — adds OnMasterDeath, OnChildSpawn, OnMasterReady, OnChildRecover, CommandProducer to fasthttp/prefork

valyala/fasthttp#2180

Test plan

All prefork tests pass (child, master, TLS, mTLS, hooks)
Full fiber test suite passes (27s)
FastHTTP prefork tests pass (20/20)
gosec security scan: 0 issues

🤖 Generated with Claude Code

…tion Replace Fiber's own prefork implementation with fasthttp's prefork package. This eliminates duplicated process management logic and adds new features: - IsChild() now delegates to prefork.IsChild() - Master process uses fasthttp's recovery loop (RecoverThreshold) - Callbacks (OnChildSpawn, OnMasterReady, OnChildRecover) integrate Fiber's hooks system (OnFork, OnListen, startup message) - CommandProducer enables clean test injection (replaces testPreforkMaster) - OnMasterDeath replaces Fiber's watchMaster (now in fasthttp) - New PreforkRecoverThreshold field in ListenConfig - prefork_logger.go adapts Fiber's logger to fasthttp's Logger interface - go.mod uses replace directive for local fasthttp development Code reduction: ~200 lines of process management removed from Fiber. All existing tests adapted for recovery behavior (ErrOverRecovery). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Ensures deterministic and fast execution regardless of GOMAXPROCS count. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Use github.com/ReneWerner87/fasthttp@2802b1a (prefork_optimization branch) instead of local ../fasthttp path, so CI and other developers can resolve the dependency. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Includes fix for ListenAndServeTLS parameter order preservation. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

- prefork_logger.go: use grouped import declaration - prefork.go: rename unused 'files' parameter to '_' - prefork.go: wrap external errors from cmd.Start() and ListenAndServe() Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

- Move windowsOS constant to constants.go (global consts file) - Make prefork logger configurable via ListenConfig.PreforkLogger - Define PreforkLoggerInterface for custom logger implementations - Use logger.Printf instead of direct log.Warnf in OnChildRecover - Remove unused log import from prefork.go Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

coderabbitai · 2026-04-11T19:33:08Z

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Code Review

This pull request refactors the preforking mechanism by delegating process management to the fasthttp/prefork package, simplifying the internal implementation and adding support for recovery thresholds and custom loggers. Feedback highlights a security and maintenance risk regarding the use of a personal fork for fasthttp, a bug in the test command producer that starts processes prematurely, and a logic issue where the default recovery threshold could be zero on single-core systems.

go.mod

prefork.go

…tems runtime.GOMAXPROCS(0)/2 yields 0 on single-core, disabling recovery. Use max(1, ...) to guarantee at least one recovery attempt. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

codecov · 2026-04-12T17:38:34Z

Codecov Report

❌ Patch coverage is 92.85714% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.26%. Comparing base (6c19f48) to head (b0d1e8c).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
prefork.go	92.50%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4210      +/-   ##
==========================================
+ Coverage   91.16%   91.26%   +0.09%     
==========================================
  Files         123      124       +1     
  Lines       11855    11846       -9     
==========================================
+ Hits        10808    10811       +3     
+ Misses        659      649      -10     
+ Partials      388      386       -2

Flag	Coverage Δ
unittests	`91.26% <92.85%> (+0.09%)`	⬆️

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Includes lint fixes and review feedback for CommandProducer validation. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ReneWerner87 and others added 7 commits April 11, 2026 20:09

test(prefork): add PreforkRecoverThreshold to invalid-command test case

dba20e1

Ensures deterministic and fast execution regardless of GOMAXPROCS count. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

refactor(prefork): use windowsOS constant in dummyCmd for consistency

cfc5a9d

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

build: update fasthttp fork reference to c1055ce

3124fc2

Includes fix for ListenAndServeTLS parameter order preservation. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ReneWerner87 added v3 ✏️ Feature 🤖 Dependencies labels Apr 11, 2026

ReneWerner87 added this to v3 Apr 11, 2026

ReneWerner87 added this to the v3 milestone Apr 11, 2026

ReneWerner87 removed the 🤖 Dependencies label Apr 11, 2026

ReneWerner87 mentioned this pull request Apr 11, 2026

feat(prefork): add support for process monitoring and callbacks in prefork mode #4037

Merged

gemini-code-assist bot reviewed Apr 11, 2026

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fix(prefork): ensure minimum RecoverThreshold of 1 on single-core sys…

696dfc2

…tems runtime.GOMAXPROCS(0)/2 yields 0 on single-core, disabling recovery. Use max(1, ...) to guarantee at least one recovery attempt. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ReneWerner87 added the 🤖 Dependencies label Apr 12, 2026

ReneWerner87 mentioned this pull request Apr 12, 2026

feat(prefork): Enhance prefork management with WatchMaster, CommandProducer, and Windows support valyala/fasthttp#2180

Open

build: update fasthttp fork reference to be2ef67

b0d1e8c

Includes lint fixes and review feedback for CommandProducer validation. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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feat(prefork): delegate to fasthttp/prefork to eliminate code duplication#4210

feat(prefork): delegate to fasthttp/prefork to eliminate code duplication#4210
ReneWerner87 wants to merge 9 commits intomainfrom
prefork_optimization

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ReneWerner87 commented Apr 11, 2026 •

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