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♻️ Refactor: reduce DefaultCtx from 768 bytes to 736 bytes #3353

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@ksw2000 ksw2000 commented Mar 15, 2025

Description

In the default context, pathBuffer and detectionPathBuffer can be used as path and detectionPath directly. We can remove two string fields and save 32 bytes for each context.

goos: linux
goarch: amd64
pkg: github.com/gofiber/fiber/v3
cpu: AMD EPYC 9J14 96-Core Processor                
                                             │   old.txt   │              new.txt               │
                                             │   sec/op    │   sec/op     vs base               │
_Ctx_AcquireReleaseFlow/withoutRequestCtx-16   41.30n ± 1%   39.10n ± 0%  -5.33% (p=0.000 n=25)
_Ctx_AcquireReleaseFlow/withRequestCtx-16      530.8n ± 1%   518.7n ± 1%  -2.28% (p=0.000 n=25)
geomean                                        148.1n        142.4n       -3.82%

                                             │   old.txt    │                new.txt                │
                                             │     B/op     │     B/op      vs base                 │
_Ctx_AcquireReleaseFlow/withoutRequestCtx-16     3.000 ± 0%     3.000 ± 0%       ~ (p=1.000 n=25) ¹
_Ctx_AcquireReleaseFlow/withRequestCtx-16      1.532Ki ± 0%   1.532Ki ± 0%       ~ (p=1.000 n=25) ¹
geomean                                          68.61          68.61       +0.00%
¹ all samples are equal

                                             │  old.txt   │               new.txt               │
                                             │ allocs/op  │ allocs/op   vs base                 │
_Ctx_AcquireReleaseFlow/withoutRequestCtx-16   1.000 ± 0%   1.000 ± 0%       ~ (p=1.000 n=25) ¹
_Ctx_AcquireReleaseFlow/withRequestCtx-16      5.000 ± 0%   5.000 ± 0%       ~ (p=1.000 n=25) ¹
geomean                                        2.236        2.236       +0.00%
¹ all samples are equal

Type of change

  • Enhancement (improvement to existing features and functionality)
  • Code consistency (non-breaking change which improves code reliability and robustness)

Checklist

Before you submit your pull request, please make sure you meet these requirements:

  • Followed the inspiration of the Express.js framework for new functionalities, making them similar in usage.
  • Conducted a self-review of the code and provided comments for complex or critical parts.
  • Updated the documentation in the /docs/ directory for Fiber's documentation.
  • Added or updated unit tests to validate the effectiveness of the changes or new features.
  • Ensured that new and existing unit tests pass locally with the changes.
  • Verified that any new dependencies are essential and have been agreed upon by the maintainers/community.
  • Aimed for optimal performance with minimal allocations in the new code.
  • Provided benchmarks for the new code to analyze and improve upon.

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coderabbitai bot commented Mar 15, 2025

Walkthrough

This pull request refactors the handling of HTTP paths by updating the DefaultCtx struct in ctx.go and modifying the invocation of the match function in router.go. The DefaultCtx struct eliminates buffer fields for paths, replacing them with byte slices and making corresponding adjustments in its methods. In router.go, the parameters passed to the match function are now wrapped in utils.UnsafeString, indicating a conversion to a potentially unsafe string format.

Changes

File(s) Changes Summary
ctx.go - Removed pathBuffer and detectionPathBuffer fields.
- Added path and detectionPath as []byte.
- Updated Path, configDependentPaths, and getDetectionPath methods to utilize the new fields and handle string conversion correctly.
router.go - Adjusted the next method in the App struct to pass c.detectionPath and c.path to the match function using utils.UnsafeString.

Sequence Diagram(s)

sequenceDiagram
    participant App
    participant Ctx as DefaultCtx
    participant Utils
    participant Match as match()

    App->>Ctx: Process request context
    Ctx-->>App: Return modified path via getString()
    App->>Utils: Convert c.detectionPath to UnsafeString
    App->>Utils: Convert c.path to UnsafeString
    App->>Match: Call match(UnsafeString(detectionPath), UnsafeString(path))
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Poem

I am a rabbit, quick and spry,
Hop-ping through code under the sky.
Buffers are gone; bytes now lead the way,
Paths are trimmed and pave a clearer day.
With every change, I dance and sing,
Celebrating code evolution with a joyful spring! 🐇


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📥 Commits

Reviewing files that changed from the base of the PR and between 395c8fa and 18be6c1.

📒 Files selected for processing (2)
  • ctx.go (5 hunks)
  • router.go (1 hunks)

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codecov bot commented Mar 15, 2025

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.60%. Comparing base (395c8fa) to head (18be6c1).

Additional details and impacted files
@@            Coverage Diff             @@
##             main    #3353      +/-   ##
==========================================
- Coverage   83.61%   83.60%   -0.02%     
==========================================
  Files         118      118              
  Lines       11727    11719       -8     
==========================================
- Hits         9806     9798       -8     
  Misses       1491     1491              
  Partials      430      430              
Flag Coverage Δ
unittests 83.60% <100.00%> (-0.02%) ⬇️

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@ksw2000 ksw2000 marked this pull request as ready for review March 15, 2025 08:38
@ksw2000 ksw2000 requested a review from a team as a code owner March 15, 2025 08:38
@ksw2000 ksw2000 requested review from gaby, sixcolors, ReneWerner87 and efectn and removed request for a team March 15, 2025 08:38
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LGTM, just one comment.


// Define the path for dividing routes into areas for fast tree detection, so that fewer routes need to be traversed,
// since the first three characters area select a list of routes
c.treePath = c.treePath[0:0]
c.treePath = ""
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Why replace c.treePath[:0] here?

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3 participants