Enhance radix tree with generics #3594
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Summary of Changes
Hello @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 modernizes the radix.Tree implementation by migrating it to use Go generics, significantly enhancing type safety and code clarity by removing reliance on interface{} for value storage. In addition to this core refactoring, performance optimizations such as an LRU cache for prefix lookups and an adaptive edge storage mechanism within tree nodes have been implemented. The App and router components have been updated to seamlessly integrate with the new generic tree, ensuring a more robust and efficient routing mechanism.
Highlights
- Generics Adoption: The core
radix.Treeimplementation, along with its internalnodeandedgestructures, has been refactored to leverage Go generics ([V any]). This change replaces the use ofinterface{}(aliased asany) for storing values, providing compile-time type safety and eliminating the need for runtime type assertions. - Type-Safe Integration: The
Appand router components have been updated to seamlessly integrate with the new genericradix.Tree. Specifically,app.radixTreesnow explicitly uses[]*radix.Tree[[]*Route], which removes the need for manual type assertions like.([]*Route)when retrieving values, leading to cleaner and safer code. - Performance Enhancements: Two key performance improvements have been introduced to the
radix.Tree: an LRU cache forLongestPrefixlookups to speed up repeated queries, and an adaptive edge storage mechanism withinnodes that switches from a slice to a map for child edges when the fan-out exceeds a threshold, optimizinggetEdgeandsetEdgeoperations for dense nodes. - Test Updates & Cleanup: The
radixpackage's tests have been adjusted to instantiate the genericTreewith specific types (e.g.,New[int]()) and to correctly handle zero values for generic types. Additionally, some duplicated comments and unnecessarynilassignments have been cleaned up.
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Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## 2025-07-17-12-41-05 #3594 +/- ##
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- Coverage 91.03% 90.74% -0.29%
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Files 112 112
Lines 11373 11467 +94
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+ Hits 10353 10406 +53
- Misses 766 802 +36
- Partials 254 259 +5
Flags with carried forward coverage won't be shown. Click here to find out more. ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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Code Review
This pull request enhances the radix tree with generics, improving type safety and code clarity. The addition of an LRU cache is a thoughtful performance optimization. My review includes a few suggestions to further improve the code, mainly focusing on correctness, maintainability, and removing some duplicated comments.
radix/radix.go
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| child.edges = []edge[V]{{label: split.prefix[0], node: split}} | ||
| child.leaf = false |
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When a node is split, the original child node becomes an internal node. Its value is moved to the new split node, but it's not cleared from the child node. While child.leaf is set to false, preventing this stale value from being returned in lookups, the value itself is still held in memory. If V is a pointer type or a large struct, this can lead to a memory leak, as the object will not be garbage collected. To prevent this, you should explicitly set child.value to the zero value for type V.
child.prefix = child.prefix[:l]
var zero V
child.value = zero
child.edges = []edge[V]{{label: split.prefix[0], node: split}}There was a problem hiding this comment.
⚠️ Performance Alert ⚠️
Possible performance regression was detected for benchmark.
Benchmark result of this commit is worse than the previous benchmark result exceeding threshold 1.50.
| Benchmark suite | Current: 259a22b | Previous: 30dee26 | Ratio |
|---|---|---|---|
BenchmarkAppendMsgitem-4_middleware_csrf - MB/s |
3141.32 MB/s |
1594.3 MB/s |
1.97 |
BenchmarkAppendMsgstorageManager |
0.6275 ns/op 1593.71 MB/s 0 B/op 0 allocs/op |
0.3247 ns/op 3079.84 MB/s 0 B/op 0 allocs/op |
1.93 |
BenchmarkAppendMsgstorageManager - ns/op |
0.6275 ns/op |
0.3247 ns/op |
1.93 |
BenchmarkAppendMsgdata - MB/s |
3212.92 MB/s |
1600.78 MB/s |
2.01 |
This comment was automatically generated by workflow using github-action-benchmark.
Summary
anyradix.Tree[[]*Route]