🧹 chore: pool form binder maps#3966
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Caution Review failedThe pull request is closed. WalkthroughThe changes introduce object pooling for form maps and file header maps in the form binder to reduce memory allocations. Maps are acquired from pools during binding operations and explicitly cleared before being returned to pools for reuse. Tests verify that state is properly cleared between successive requests. Changes
Estimated code review effort🎯 2 (Simple) | ⏱️ ~10 minutes Possibly related PRs
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Summary of ChangesHello @gaby, 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 optimizes the form binding process by implementing object pooling for the maps used to store form values and multipart file headers. By reusing these map objects instead of allocating new ones for each request, the change aims to reduce memory pressure and garbage collection overhead, leading to improved performance. Comprehensive regression tests have been added to ensure the integrity of data binding and prevent any cross-request data contamination from the pooled objects. Highlights
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## main #3966 +/- ##
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- Coverage 91.67% 91.65% -0.02%
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Files 119 119
Lines 10177 10227 +50
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+ Hits 9330 9374 +44
- Misses 536 539 +3
- Partials 311 314 +3
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Code Review
This pull request introduces sync.Pool to reuse maps for form values and multipart file headers, aiming to reduce memory allocations. The implementation is sound and includes regression tests to verify that pooled maps are cleared between requests. My review includes a few suggestions to improve the implementation by using the clear() built-in function (available since Go 1.21) and removing a redundant map clearing operation to make the code more efficient and maintainable.
| func releaseFormMap(m map[string][]string) { | ||
| clearFormMap(m) | ||
| formMapPool.Put(m) | ||
| } |
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The acquireFormMap function already clears the map before it's used. Clearing it again here in releaseFormMap before putting it back in the pool is redundant. To avoid this duplicate work, it's best to stick to one pattern. Clearing on acquisition is generally safer, so I recommend removing the clear operation from this release function.
func releaseFormMap(m map[string][]string) {
formMapPool.Put(m)
}| func releaseFileHeaderMap(m map[string][]*multipart.FileHeader) { | ||
| clearFileHeaderMap(m) | ||
| formFileMapPool.Put(m) | ||
| } |
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Similar to releaseFormMap, the acquireFileHeaderMap function already handles clearing the map. To avoid redundant work, the call to clearFileHeaderMap can be removed from this release function.
func releaseFileHeaderMap(m map[string][]*multipart.FileHeader) {
formFileMapPool.Put(m)
}| func clearFormMap(m map[string][]string) { | ||
| for k := range m { | ||
| delete(m, k) | ||
| } | ||
| } |
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Since the project's Go version is 1.25.0, you can use the built-in clear() function to empty the map. This is more idiomatic and can be more efficient than iterating over the map to delete each key.
func clearFormMap(m map[string][]string) {
clear(m)
}| func clearFileHeaderMap(m map[string][]*multipart.FileHeader) { | ||
| for k := range m { | ||
| delete(m, k) | ||
| } | ||
| } |
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Similar to clearFormMap, you can use the built-in clear() function here for better readability and potential performance improvement.
func clearFileHeaderMap(m map[string][]*multipart.FileHeader) {
clear(m)
}There was a problem hiding this comment.
Pull request overview
This PR introduces memory pooling for form binding maps to reduce allocations during request processing. By reusing pooled map[string][]string and map[string][]*multipart.FileHeader instances, the binder avoids repeatedly allocating new maps for each request.
- Adds sync.Pool instances for form value maps and multipart file header maps
- Implements acquire/release helper functions with clearing logic to ensure maps are cleaned between uses
- Includes regression tests verifying that pooled maps don't leak data between requests
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.
| File | Description |
|---|---|
| binder/form.go | Implements sync.Pool for form and file header maps with acquire/release/clear helper functions; updates Bind and bindMultipart methods to use pooled maps with proper cleanup via defer |
| binder/form_test.go | Adds two regression tests to verify that pooled maps are properly cleared between sequential requests for both URL-encoded and multipart forms |
| func clearFileHeaderMap(m map[string][]*multipart.FileHeader) { | ||
| for k := range m { | ||
| delete(m, k) | ||
| } | ||
| } |
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Consider using the built-in clear function instead of manually iterating and deleting keys. This would be more idiomatic and consistent with other parts of the codebase (e.g., client/request.go:822, ctx.go:633). The built-in clear function has been available since Go 1.21, and this project uses Go 1.25.0.
| func clearFormMap(m map[string][]string) { | ||
| for k := range m { | ||
| delete(m, k) | ||
| } | ||
| } |
There was a problem hiding this comment.
Consider using the built-in clear function instead of manually iterating and deleting keys. This would be more idiomatic and consistent with other parts of the codebase (e.g., client/request.go:822, ctx.go:633). The built-in clear function has been available since Go 1.21, and this project uses Go 1.25.0.
Summary
Testing
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