test(api): assert the OpenAPI spec and the server agree on routes - #2448
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First slice of #2112. Until now api/aicr/v1/server.yaml was referenced by no workflow, no Makefile target, and nothing under tools/ -- 3341 lines of published contract that nothing validated, diffed, or checked against the handlers. #1943 had to retroactively align the spec with what the handler actually accepted; nothing would catch the next one. Three assertions, all derived from the spec rather than a hand-maintained list. TestRouteConfiguration already pins the six application routes by hand, which catches a deleted route but cannot catch a route the spec promises and the server never registers. - Paths match in both directions. A spec path with no route is a 404 for any client generated from the contract; a route absent from the spec is an undocumented endpoint the forthcoming breaking-change gate could never protect, since a gate cannot diff what the baseline never had. - Every declared method is accepted (asserts only "not 405", so a documented operation may still answer 400 for an unpopulated request without turning this into a fixture-maintenance burden). - Every undeclared method is rejected. This is the direction that rots silently: an endpoint accepting POST while the spec documents only GET is an ungated public operation nothing else would notice. Scope is paths and methods only. Request/response shapes stay with the contract tests in openapi_sync_test.go. The oasdiff breaking-change gate is the remaining part of #2112 and is deliberately not here: its baseline cannot be committed until #2417 removes the alpha apiVersion enum values, or it would fail on its own planned removal. Refs #2112 Signed-off-by: Mark Chmarny <mark@chmarny.com>
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Included review availability: Your plan provides up to 12 included reviews per hour; 10 remain after this review. 📝 WalkthroughWalkthroughAdded a GET-only wrapper for Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This PR adds spec-to-route conformance checks and restricts /metrics to its documented GET method without affecting Prometheus scraping; no actionable merge-blocking risk remains after normal checks and review. Suggested reviewers: 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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In `@pkg/server/openapi_routes_test.go`:
- Around line 164-177: Update the method tests around newRoutes and the related
method-assertion loop to construct the server with New(...) and issue requests
through s.httpServer.Handler. Iterate over the complete public route set,
including /health, /ready, and /metrics, rather than skipping routes absent from
newRoutes, and validate both declared and undeclared HTTP methods for every
route.
- Around line 209-210: Update the probes setup in the OpenAPI route test to
cover every method represented by httpMethods, including HEAD, OPTIONS, and
TRACE. Either add those constants to probes or derive probes directly from
httpMethods, while preserving the existing method validation behavior.
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pkg/server/openapi_routes_test.go
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Coverage Report ✅
Coverage BadgeMerging this branch will increase overall coverage
Coverage by fileChanged files (no unit tests)
Please note that the "Total", "Covered", and "Missed" counts above refer to code statements instead of lines of code. The value in brackets refers to the test coverage of that file in the old version of the code. |
Review findings on this PR. The method tests iterated the newRoutes map, so the four routes registered outside it -- /, /health, /ready, /metrics -- were never method-checked, and the probe list omitted HEAD, OPTIONS and TRACE even though the spec-side verb set includes them. Both tests now drive the assembled mux and derive probes from that same verb set, with rate limiting raised so a 429 cannot be mistaken for a contract violation. Widening it immediately found one: promhttp.Handler does no method filtering, so /metrics answered 200 to DELETE, PUT, POST, PATCH, HEAD, OPTIONS and TRACE, while api/aicr/v1/server.yaml declares GET alone. That is seven undocumented operations on a public endpoint. getOnly restricts it to GET, matching the published contract; Prometheus scrapes with GET. HEAD is rejected rather than accepted. The spec does not declare it, and widening the surface to match an implementation detail is the wrong direction when the point is to make the contract true. This makes the PR no longer test-only. Reverting getOnly reproduces exactly seven failures. Refs #2112 Signed-off-by: Mark Chmarny <mark@chmarny.com>
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Both findings applied in Method tests now drive the assembled mux. They iterated the Probes derive from the spec verb set. What that found: I fixed the server rather than exempting the route. Exempting would have weakened the gate on its first real catch, which is the opposite of the point. HEAD is rejected rather than accepted. It is defensible either way, but the spec does not declare it, and widening the documented surface to match an implementation detail is the wrong direction when the goal is to make the contract true. Adding it later is a deliberate change to both the spec and the guard. This makes the PR no longer test-only — the Risk Assessment in the description is now understated, and I will update it. Reverting
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📋 Multi-persona review — routes/methods conformance
Method: three independent persona reviewers (Correctness/Test-quality · API-contract/Domain · Security/Operability) fanned out in parallel, then every finding was re-derived from the resolved code by an adversarial senior meta-reviewer. Anchored to head f660c613.
Tier legend: 🔴 Blocker · 🟠 Major · 🟡 Minor · 🔵 Nitpick
Overall
A tight, well-argued PR. The core mechanics are correct and independently verified: the spec's 10 paths and their method declarations match the server's registered routes exactly; undeclared-method rejection checks out path-by-path (every handler returns exactly 405 for undeclared verbs); the anti-vacuum guards (empty-paths fatal, per-path len==0, sorted subtests) are sound; and the rate-limit override genuinely takes effect, so throttling cannot masquerade as a contract violation. The getOnly fix is a correct, leak-free hardening — /metrics is the only promhttp.Handler() in the tree, so wrapping it is the complete fix, and no non-GET /metrics probe/scrape exists anywhere in charts, deploy manifests, or docs (Prometheus scrapes with GET), so the HEAD/OPTIONS→405 change breaks nothing.
Both candidates a persona initially raised as 🟠 survived only at 🟡 after adjudication: one is a documented inherent limitation of http.ServeMux (no pattern enumeration), the other a body-format consistency nit with no underlying spec schema to violate.
Confirmed non-issues (examined and cleared)
- HEAD/OPTIONS to
/metricsnow 405 (was 200) — intended narrow-don't-widen behavior; no non-GET consumer of/metricsexists in-repo. /metricsbypasses rate-limit/auth/requestID/panic-recovery middleware — pre-existing (mux.Handlesince before this PR); this PR only adds thegetOnlywrapper. Out of scope, not a finding against this change.getOnlycorrectness —Allow: GET, 405 status, GET passthrough, and HEAD hitting the 405 branch (nonet/httpHEAD→GET auto-conversion at this layer): verified.- Rate-limit override takes effect —
New()rebuilds the limiter froms.configafterwithConfig;parseConfigreads no env var affectingRateLimit, so CI env drift cannot throttle assertions into false 429s.
Summary
| 🔴 Blocker | 🟠 Major | 🟡 Minor | 🔵 Nitpick |
|---|---|---|---|
| 0 | 0 | 3 | 3 |
Recommendation: Approve with comments. No blockers. Highest-leverage optional follow-up is a shared WriteError-based getOnly helper (folds together the two server.go comments); the systemRoutes list is the known ceiling of the test's coverage and worth a one-line acknowledgment.
| // systemRoutes are registered directly on the mux in New rather than through | ||
| // newRoutes, so they have no other in-code source of truth to compare against. | ||
| // Keep in sync with the mux.HandleFunc calls in server.go. | ||
| var systemRoutes = []string{"/health", "/ready", "/metrics"} |
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🟡 Minor — systemRoutes hand-list blind spot: a future direct-mux route escapes all three conformance tests
registeredPaths derives the "routes served" set from s.config.Handlers ∪ this hand-maintained systemRoutes, not from the real mux. A future mux.HandleFunc("/debug", …) added directly in New() — the very place system routes are wired — would be in none of the three sources these tests consume, so it escapes TestOpenAPISpecPathsMatchRegisteredRoutes, ...MethodsAreAccepted, and ...UndeclaredMethodsAreRejected alike: the exact 'undocumented endpoint nothing would notice' failure mode this PR sets out to catch. Mitigating: http.ServeMux exposes no public pattern enumeration even at go 1.27, so a hand-list is the only practical mechanism and the keep-in-sync coupling is already documented at lines 57-59. Latent, not active. (Raised by two persona lenses; a persona initially tiered this Major, downgraded to Minor after the meta-reviewer confirmed the ServeMux limitation.)
Blast radius: A genuinely undocumented, ungated public endpoint added directly to the mux passes CI green — but only on a future direct-mux addition.
Fix: Optional: a small guard test asserting len(systemRoutes) equals the count of direct mux.Handle* calls, or record registered patterns on the Server as they are wired and build the set from that.
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| if r.Method != http.MethodGet { | ||
| w.Header().Set("Allow", http.MethodGet) | ||
| http.Error(w, "method not allowed", http.StatusMethodNotAllowed) |
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🟡 Minor — /metrics 405 is plain text, diverging from the structured JSON error envelope its peers use
getOnly emits http.Error(w, "method not allowed", 405) (plain text), whereas every sibling 405 — /health, /ready, root, and the recipe/query/bundle handlers — returns the structured JSON error envelope via WriteError, the convention documented in docs/contributor/api-server.md:83. WriteError self-generates a requestID when the middleware context is absent (errors.go:42-45), so the /metrics middleware bypass is no obstacle to using it. This is a consistency divergence, not a contract violation: server.yaml declares no 405 response schema on any endpoint, and /metrics is a promhttp system endpoint already serving plain-text data (downgraded from Major on that basis).
Blast radius: A client that pattern-matches the JSON error envelope (code/requestId) gets a text/plain surprise on /metrics; small, since callers rarely POST to /metrics.
Fix: Optional: route the 405 through WriteError(w, r, http.StatusMethodNotAllowed, aicrerrors.ErrCodeMethodNotAllowed, "Method not allowed", false, map[string]any{keyMethod: r.Method}) — which also collapses the duplicated-guard nitpick below.
| rec := httptest.NewRecorder() | ||
| mux.ServeHTTP(rec, httptest.NewRequest(method, path, nil)) | ||
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| if rec.Code == http.StatusMethodNotAllowed { |
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🟡 Minor — "not 405" is a weak acceptance oracle — a declared op that 500s or panics still passes
TestOpenAPISpecMethodsAreAccepted only fails on rec.Code == 405, so a declared operation whose handler panics (→500 via panicRecoveryMiddleware) or unconditionally 500s satisfies the assertion — the title over-promises relative to what it verifies. The docstring frames the narrowness as intentional (avoid fixture maintenance), which is defensible.
Blast radius: False confidence that a documented method works; only outright 405 regressions are caught.
Fix: Optional test-hardening: also fail on rec.Code >= 500. I traced every declared op with a nil-body probe (recipe/query GET → 400, POST → 400; bundle POST → 400) and none returns ≥500 today, so this is safe now and would surface laundered panics.
| // widening the surface to match an implementation detail is the wrong direction | ||
| // when the point is to make the published contract true. Adding it later is a | ||
| // deliberate change to both the spec and this guard. | ||
| func getOnly(next http.Handler) http.Handler { |
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🔵 Nitpick — getOnly is a 4th inlined copy of the method-gate block
The if r.Method != http.MethodGet { w.Header().Set("Allow", …); <405> } pattern is now inlined in four places — health.go:34, health.go:51, server.go:244 (root), and getOnly:288.
Blast radius: Pure DRY taste at this count; the only material divergence (getOnly's plain-text body) is the finding above.
Fix: A single shared helper using WriteError would collapse both this and the plain-text-405 divergence.
| // cannot be captured until #2417 removes the alpha apiVersion enum values, or | ||
| // it would fail on its own planned removal. | ||
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| const specRelPath = "../../api/aicr/v1/server.yaml" |
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🔵 Nitpick — relative spec path assumes go test CWD (non-issue for this repo's lane)
../../api/aicr/v1/server.yaml resolves via the per-package CWD that go test sets, which would break under go test -c compiled binaries, Bazel, or a CWD-changing harness. The Makefile test target runs stock go test … $(go list ./...) (line 304) and the repo has no compiled-binary or sandboxed Go lane, so this is a non-issue here (downgraded from Minor on that basis).
Blast radius: Brittle only if a hermetic/compiled-binary test runner is ever added; would yield a misleading 'read spec' failure.
Fix: If such a lane appears, anchor the path via runtime.Caller(0) + filepath.Dir.
| ops := make(map[string][]string, len(spec.Paths)) | ||
| for path, item := range spec.Paths { | ||
| var methods []string | ||
| for key := range item { |
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🔵 Nitpick — specOperations misreads a $ref/parameters-only path item as "no operations" (latent)
A path item that carries only a $ref or only shared parameters (both legal OpenAPI) yields zero method keys, tripping the len(ops[path])==0 "declares no HTTP operations" false-failure. All 10 current spec paths use inline get/post, so latent only.
Blast radius: A future spec refactor to $ref path items would break the suite spuriously.
Fix: Skip or resolve $ref/parameters-only path items rather than treating them as an error.
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Approving. Four non-blocking items, ordered by when they are cheapest to handle.
1. The title outlives the PR and currently misdescribes it. test(api): labels a change that alters public endpoint behavior — /metrics goes from answering 200 on seven methods to 405. The body is candid about that, but the body does not survive: this repo squashes with squash_merge_commit_title: PR_TITLE and squash_merge_commit_message: BLANK, so the title alone reaches main and cannot be edited afterward. Everything else here is fixable in a follow-up; this is not. Suggest something closer to fix(server): restrict /metrics to GET and assert spec/route agreement.
2. getOnly returns a plain-text 405 while every other 405 in the package returns structured JSON. Seven existing call sites — including handleHealth and handleReady, two functions above it in the same file — use WriteError(w, r, http.StatusMethodNotAllowed, aicrerrors.ErrCodeMethodNotAllowed, "Method not allowed", false, map[string]any{keyMethod: r.Method}), which also sets the Allow header the helper sets by hand. A client parsing the project's error envelope gets JSON from /health and a bare string from /metrics for the identical condition. One-line swap, and it fits the PR's own thesis of making the published contract truthful.
3. The new tests freeze HEAD rejection into an asserted contract. TestOpenAPIUndeclaredMethodsAreRejected requires 405 for every undeclared method on every registered path, so HEAD is now pinned as rejected on /, /health, /ready, /metrics, and every v1 and v2 GET endpoint. RFC 9110 §9.1 says general-purpose servers must support GET and HEAD. The rejection is pre-existing on /health and /ready, so this is not a regression the PR introduces — but the PR is what turns a wart into an invariant, which makes it the moment to decide deliberately. Declaring head: alongside get: in the spec would give the same alignment without standing against a MUST; if the deviation is intended, a sentence in the test's doc comment would stop the next reader from "fixing" it.
4. Worth stating how the new deprecation policy applies. The policy table merged in #2436 classifies removing a path or method on the REST surface as breaking, and this PR removes six methods from /metrics. The defensible reading — those methods were never declared in api/aicr/v1/server.yaml, so they were never part of the frozen surface — is almost certainly correct, and it is exactly the reasoning the policy exists to make explicit. As the first change to exercise that policy, saying so in a line beats leaving each reviewer to re-derive it.
Verified sound and not repeated above: the operation-key filter against the OpenAPI vocabulary, the len(spec.Paths) == 0 fatal, probing the full method vocabulary rather than a hand-picked list, deriving the route set from a constructed Server so the / root handler is included, the "not 405" narrowness in the accepted-methods test, and raising rather than disabling the rate limit so 429s cannot masquerade as contract violations.
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Summary
Adds a spec↔route conformance test so
api/aicr/v1/server.yamland the running server cannot drift apart unnoticed. First slice of #2112.Motivation / Context
The OpenAPI spec is one of the four surfaces ROADMAP §1 freezes at v1. Today it is referenced by no workflow, no Makefile target, and nothing under
tools/— 3341 lines of published contract that nothing validates, lints, diffs, or checks against the handlers.That is not hypothetical: #1943 had to retroactively align the spec with what the handler actually accepted, and nothing in the tree would catch the next occurrence.
TestRouteConfigurationinserve_test.gopins the six application routes, but by hand — it catches a deleted route and cannot catch a route the spec promises and the server never registers.Fixes: N/A
Related: #2112, #1943, #1953, #2370
Type of Change
Component(s) Affected
cmd/aicrd,pkg/server)Implementation Notes
Three assertions, all derived from the spec rather than a hand-maintained list:
POSTwhile the spec documents onlyGETis an ungated public operation nothing else in the tree would notice.Route set is sourced from
New(WithHandler(newRoutes(...))), not fromnewRoutesalone. My first draft readnewRoutesdirectly and immediately reported/as an undelivered promise of the spec —configureRootHandlerinstalls the root handler separately. That was a defect in the test, not the server, and the helper now builds a realServerso it cannot recur. The three system routes (/health,/ready,/metrics) are registered directly on the mux and are listed explicitly with a pointer to their source.Deliberately out of scope
openapi_sync_test.go.oasdiffbreaking-change gate, which is the rest of API freeze: OpenAPI baseline + breaking-change gate for REST #2112. Its baseline cannot be committed yet: ADR-022 N+2 (v0.23): retire alpha and empty artifact apiVersions #2417 removes the alphaapiVersionenum values from every enum in the spec, so a baseline captured now would fail the gate on its own planned removal. Tooling can be built in parallel; the baseline waits for v0.23./v1vs/v2disposition — API freeze: OpenAPI baseline + breaking-change gate for REST #2112's first task, and a product decision, not one to make in a test PR.Testing
Mutation-tested rather than assumed. Removing
"/v2/bundle"fromnewRoutesfails the path assertion with:The suite also found a real gap in its own first draft (the
/root handler, above), which is why the route set is now derived from server construction.Test-only change; no production code is touched, so package coverage is unchanged in substance (84.2%).
Risk Assessment
Rollout notes: No longer test-only, following review. The new tests found that
promhttp.Handlerdoes no method filtering, so/metricsanswered 200 to DELETE, PUT, POST, PATCH, HEAD, OPTIONS and TRACE while the spec declaresget:alone — seven undocumented operations on a public endpoint.getOnlynow restricts/metricsto GET.The behavior change is confined to
/metrics. Prometheus scrapes with GET, so scraping is unaffected. Anything probing/metricswith HEAD or OPTIONS now receives 405 with anAllow: GETheader; HEAD is rejected rather than accepted because the spec does not declare it, and widening the documented surface to match an implementation detail is the wrong direction here. RevertinggetOnlyreproduces exactly seven test failures.The tests themselves run under
make testand are therefore already inside the merge gate; no new workflow or tool dependency is introduced.Checklist
make testwith-race)make lint)git commit -S)