perf(server): cut hot-path overhead and guard the production-shaped path - #694
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Four measured quick wins on the per-request path: - Serialize responses with goccy/go-json instead of echo's reflection- based encoding/json default (request decode already uses goccy via the core types, so every response paid for the slower of the two encoders). - Drop the dedicated request-ID middleware: RequestSnapshotCapture runs unconditionally and already calls ensureRequestID first thing, so every request paid a second context wrap + request copy for no effect. - Canonicalize session-anchor segments with goccy and replace the full second trailing-data decode with Decoder.More. Canonical bytes are byte-identical to encoding/json's (pinned by TestCanonicalSegmentMatchesStdlib), so auto-detected session ids are stable across the switch. - Look up known JSON fields for the struct-derived lists (chat request, responses request/output item) in a set instead of scanning a ~40-entry slice per key. Hand-listed callers with a handful of fields keep the linear scan, which is faster at that size. Guard benchmarks: bare hot path 6,814 -> 6,014 ns/op (110 -> 106 allocs), routed 7,771 -> 7,435 ns/op (130 -> 126 allocs), production shape 18.5 -> 16.5 us/op. Ceilings tightened accordingly. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
The perf guard built the server with a config that disables every default-on subsystem (no auth, no audit, no usage, no session keeping, no rate limits), so it measured a configuration nobody deploys — none of the middleware added since the guard was written was visible to it. The real default-deployment request costs ~2.2x the guarded one. - BenchmarkGatewayHotPathProductionShape wires master-key auth, audit (bodies + headers), usage, session keeping, and a real ratelimit service with one configured rule; TestHotPathPerfGuard now enforces allocation ceilings on it (baseline 300 allocs / ~25.1 KB). - BenchmarkAblation* isolates per-subsystem cost against the full shape (diagnostic, via make perf-bench). - TestSessionIDVisibilityByBodySize pins that content-based session auto-detection is independent of body size, including past the 64 KiB snapshot inline-capture limit. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Organization UI Review profile: ASSERTIVE Plan: Pro Plus Run ID: 📒 Files selected for processing (3)
Included review availability: Your plan includes up to 4 reviews per rolling hour; 1 remains after this review. 📝 WalkthroughWalkthroughThe change adds set-based JSON field tracking, configures goccy/go-json for responses and session canonicalization, moves request-ID assignment into ingress capture, and adds production-shaped gateway benchmarks with session visibility and allocation checks. ChangesJSON and gateway performance
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: ⚪ Minimal · up to This change reduces request overhead and adds production-shaped performance coverage without any supplied unresolved correctness or operational concerns; no actionable merge-blocking risk remains. Sequence Diagram(s)sequenceDiagram
participant BenchmarkGatewayHotPathProductionShape
participant Echo
participant Authentication
participant RateLimitService
participant MockProvider
BenchmarkGatewayHotPathProductionShape->>Echo: Send authenticated chat-completion request
Echo->>Authentication: Validate master key
Echo->>RateLimitService: Check user-path rule
Echo->>MockProvider: Route request to target model
MockProvider-->>Echo: Return chat completion
Echo-->>BenchmarkGatewayHotPathProductionShape: Return HTTP 200 and allocation data
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🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Actionable comments posted: 1
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Inline comments:
In `@internal/session/detect.go`:
- Line 214: Replace the decoder.More() trailing-data check in the session
canonicalization logic with an additional decode that must return io.EOF,
rejecting any non-whitespace trailing input such as ] or }. Add regression cases
covering trailing ] and } in canonical_test.go.
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ℹ️ Review info
⚙️ Run configuration
Configuration used: Organization UI
Review profile: ASSERTIVE
Plan: Pro Plus
Run ID: 2bcc612e-0ccc-4a5d-847f-685af4d397f3
📒 Files selected for processing (12)
internal/core/chat_json.gointernal/core/json_fields.gointernal/core/responses_json.gointernal/server/http.gointernal/server/json_serializer.gointernal/session/canonical_test.gointernal/session/detect.gotests/perf/README.mdtests/perf/ablation_test.gotests/perf/hotpath_test.gotests/perf/production_shape_test.gotests/perf/session_body_size_test.go
Included review availability: Your plan includes up to 4 reviews per rolling hour; 2 remain after this review.
Confidence Score: 4/5The change is nearly merge-safe once the session visibility regression test is made to fail when detection is absent. There is one non-security P2 finding. The test computes the expected session-detection condition but does not enforce it, leaving its intended regression protection ineffective. Files Needing Attention: tests/perf/session_body_size_test.go Reviews (1): Last reviewed commit: "test(perf): guard the production-shaped ..." | Re-trigger Greptile |
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| detected := strings.TrimSpace(in.SessionID) != "" |
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detected is calculated only for logging and is never asserted. Consequently, a request body size that causes session extraction to return an empty ID still makes this test pass, so the large-body regression guard does not protect the behavior it is intended to cover. Fail the subtest when detected is false.
Context Used: CLAUDE.md (source)
Review findings on #694: Decoder.More treats a stray closing bracket ("1]", "1}") as end of input, so such malformed raw segments would be canonicalized instead of falling back to their exact bytes as before the goccy switch. Decode to io.EOF instead — for valid input the extra decode reads only the empty remainder, so the hot path is unaffected. Adds the bracket cases to the fallback test. Also makes TestSessionIDVisibilityByBodySize assert detection instead of only logging it, so the large-body regression guard actually fails when a size stops producing a session id. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Both review findings addressed in 10bbaac:
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2 participants
Summary
Two-part change: measured hot-path quick wins, and a perf-guard extension so CI can actually see the configuration deployments run.
Part 1 — quick wins (
perf(server)commit)encoding/jsonencoder. Deserialize keeps echo's default (adminc.Binderror mapping untouched).ensureRequestID: the dedicated request-ID middleware repeated workRequestSnapshotCapture(unconditional, runs right after) already does — a second context wrap + request copy per request for no effect.Decoder.Moreinstead of a full second trailing-data decode, ~5–12× per request. Canonical bytes are byte-identical toencoding/json's — pinned byTestCanonicalSegmentMatchesStdlib— so auto-detected session ids do not re-anchor on upgrade (virtual-model affinity pins and downstream per-session consumers are unaffected).Part 2 — production-shape guard (
test(perf)commit)The guard built the server with every default-on subsystem disabled (no auth, audit, usage, session keeping, rate limits), so nothing added to the middleware chain since it was written was visible to CI — the real default deployment costs ~2.2× the guarded number.
BenchmarkGatewayHotPathProductionShape: auth + audit (bodies/headers) + usage + session keeping + a realratelimit.Servicewith one configured rule, now ceiling-enforced inTestHotPathPerfGuard(runs in the existing Performance Guard CI job viamake perf-check— no workflow change needed).BenchmarkAblation*: per-subsystem cost attribution against the full shape (diagnostic,make perf-bench).TestSessionIDVisibilityByBodySize: pins that content auto-detection is independent of body size, including past the 64 KiB snapshot inline-capture limit.User-visible impact
Lower per-request latency/allocations on every translated endpoint; no API or behavior change. Session ids, response bytes, and error shapes are unchanged (each pinned by test).
Testing
Full suite (
test-race), lint, and the extended perf guard pass locally (pre-commit runs all three); ceilings tightened to the new baselines.Related: ENTERPILOT/GoModel-pro#20 removes the Pro-side same-session serialization this benchmarking uncovered.
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Summary by CodeRabbit
Performance
Reliability
Testing & Documentation