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fix(server): exclude uninitialized replicas from readiness - #646
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/health always answered HTTP 200 with "degraded" in the body while lazy database initialization had not run on the process, so Azure readiness probes admitted cold replicas to traffic and the deployment smoke gate flapped (#488). - add /ready as the traffic-admission contract: 503 until this process has completed required initialization, sharing one collectHealth pipeline with /health so the two can never drift - keep /health as the liveness contract: always 200, verdict in the body - start background database initialization with retries at HTTP server startup so readiness no longer depends on user traffic; each attempt runs under a 10-minute bound so a wedged secret store becomes a retryable error instead of holding dbMu forever - collectHealth snapshots the store pointers under dbMu TryLock instead of racing ensureDB, reporting pending while initialization holds the lock; Lambda keeps lazy initialization and no /ready route - document /ready in the OpenAPI spec
The smoke gate warmed /api/ to trigger lazy initialization and then parsed the /health body, but the warm-up initialized whichever replica the load balancer picked, not the one the next /health request reached (#488). - wait-for-healthy.sh now polls /ready with curl --fail-with-body, so a 503 fails the attempt while still printing which dependency is pending; the warm-up request and HEALTH_WARMUP_PATH are gone because the server initializes in the background at startup - deploy-azure.yml drops its inline copy of the polling loop and calls the script for both the fast-fail gate (1x5) and the rollout-race gate (3x30), moving the sparse checkout ahead of them - the offline test replays the pre-fix inline loop with its original first-healthy-passes semantics to show it passed the rollout-race scenario, and the curl stub now only prints a 503 body when --fail-with-body was passed
Readiness and origin health probes decide whether a replica receives traffic, so they must use the readiness contract, not the 200-always liveness endpoint (#488). - AKS and Container Apps readiness probes move from /health to /ready; liveness and startup probes stay on /health - the Front Door origin group health probe moves to /ready so the CDN layer stops re-admitting cold origins the platform probe excluded; Front Door treats all origins as healthy when every probe fails, so a transient database blip cannot hard-outage the site - nginx proxies /ready to the backend so it no longer falls through to the SPA catch-all, which would answer 200 with index.html
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📝 WalkthroughWalkthroughEach HTTP-serving process now initializes its database in the background and exposes separate liveness and readiness responses. Azure probes and deployment verification use ChangesAzure readiness
Priority: ⬆️ High Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix · Severity of issue fixed: High Sequence Diagram(s)sequenceDiagram
participant StartHTTPServer
participant initializeUntilReady
participant ensureDB
participant ReadinessProbe
participant handleReadinessCheck
StartHTTPServer->>initializeUntilReady: start background initialization
initializeUntilReady->>ensureDB: attempt database initialization
ReadinessProbe->>handleReadinessCheck: request /ready
handleReadinessCheck-->>ReadinessProbe: return 503 while checks are pending
ensureDB-->>initializeUntilReady: return successful initialization
ReadinessProbe->>handleReadinessCheck: request /ready
handleReadinessCheck-->>ReadinessProbe: return 200 when status is healthy
Merge Risk: 🟡 Moderate · up to Persistent secret-resolution failures can exhaust database connections during startup retries. Close the failed attempt’s pool before merging. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Coordination note: this PR duplicates in-progress claimed work tracked on #488 (see the coordination comments there, incl. the Oct 5 comparison recommending the claimed owner's unpublished tree as base). Posted a reconciliation note on #488 offering to close this PR and port its extras (Front Door probe, nginx /ready, OpenAPI doc, TryLock race fix) if the owner publishes, or to rework it to the recommended barrier/bounded-failure design otherwise. Do not merge until that coordination resolves. |
The misspell linter enforces the canonical US spelling (migration 000089); three new comments used "cancelled".
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Actionable comments posted: 1
🔇 Additional comments (10)
scripts/nginx.conf (1)
35-41: LGTM!terraform/modules/compute/azure/aks/main.tf (1)
452-454: LGTM!Also applies to: 457-457
terraform/modules/compute/azure/container-apps/main.tf (1)
164-167: LGTM!Also applies to: 171-171
terraform/modules/frontend/azure/main.tf (1)
191-194: LGTM!Also applies to: 196-196
internal/server/app.go (1)
89-92: LGTM!internal/server/health.go (1)
80-98: LGTM!internal/server/readiness_test.go (1)
1-299: LGTM!internal/api/openapi.yaml (1)
2117-2140: LGTM!internal/server/health_test.go (1)
381-381: LGTM!Also applies to: 417-417
scripts/wait-for-healthy.sh-53-53 (1)
53-53: 🎯 Functional Correctness | 🟠 Major | ⚡ Quick win
⚠️ Unverified finding
Verification ran but could not confirm this finding. It is shown for review, not as a verified issue.Require HTTP 200 before counting a ready response.
If a proxy or authentication layer returns HTTP 3xx for
/ready, curl exits successfully without checking the destination. The script then counts the redirect as ready and can pass both deployment gates without a healthy readiness response. Check the numeric status code before incrementingstreak, and add a redirect case to the offline tests.
- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @internal/server/http.go:
- Around line 32-37: In ensureDB, close dbConn and clear app.DB when
resolveAdminPassword returns an error during AutoMigrate, before returning the
error; preserve the existing fatal error behavior.
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📒 Files selected for processing (13)
.github/workflows/deploy-azure.ymlinternal/api/openapi.yamlinternal/server/app.gointernal/server/health.gointernal/server/health_test.gointernal/server/http.gointernal/server/readiness_test.goscripts/nginx.confscripts/test-wait-for-healthy.shscripts/wait-for-healthy.shterraform/modules/compute/azure/aks/main.tfterraform/modules/compute/azure/container-apps/main.tfterraform/modules/frontend/azure/main.tf
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CodeRabbit review on #646: ensureDB stored dbConn in app.DB before resolveAdminPassword, and that failure path returned without closing or clearing it. The new background retry loop would leak one pool per 5-second attempt while a secret store stays unreachable. Close and clear, matching the reinitializeAfterConnect failure path below it. Not covered by a new unit test: reaching this branch requires a live PostgreSQL connection (NewConnection fails first otherwise), which the package's hermetic tests cannot fake; the fix mirrors the adjacent, already-reviewed cleanup path.
…igrations ready - wait-for-healthy.sh: drop -f; curl rejects -f together with --fail-with-body (exit 2), so the Azure readiness gate could never pass. The offline stub now rejects that combination and a real-curl check runs against throwaway localhost 200/503 servers. - /ready: only a pending migration run makes the replica unready. A failed run stays "degraded" in the body (and in /health) but answers 200, since ensureDB never retries migrations and 503 would pull every replica after one transient error.
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The GCP test-deployment job still used the pre-LeanerCloud#488 inline smoke gate: warm up /api/auth/check-admin, then parse the /health body. The two requests could land on different Cloud Run instances, and /health is a liveness signal. Replace both inline steps with scripts/wait-for-healthy.sh against /ready, with the same fast-gate (1 of 5) and rollout smoke-gate (3 in a row within 30) parameters deploy-azure.yml uses since LeanerCloud#646. Refs LeanerCloud#648 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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…tus (#1023) * fix(infra): gate deployment checks and GCP uptime on /health body status /health is the liveness contract since #488/#646: it answers HTTP 200 even when every dependency is down and reports the verdict in the body's top-level "status" ("healthy" / "degraded"). Two verification layers still treated that 200 as meaningful and passed on a fully degraded deployment: - deployment-checks: check "health" asserted only status_code == 200, and the warmup provisioner returned on any non-000/502/503 status. The check now also requires jsondecode(body).status == "healthy", and warmup waits for a 200 whose body reports "healthy" (falling back to 200-only when python3 is unavailable). Gating on the body works unchanged on Lambda, where /ready does not exist. - monitoring/gcp: the uptime check's CONTAINS_STRING "healthy" matcher also matches "unhealthy" and every nested check's {"status":"healthy"}, so it passed on degraded replicas. It now exact-matches "healthy" at JSON path $.status. It stays on /health, not /ready. /health's status-code semantics are unchanged. Tests: terraform tests for both modules (mocked providers, plan only; they fail on the old config) wired into the terraform-validate CI job, plus a Go test pinning the top-level "status" contract on the server mux and the Lambda router. Closes #649 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * build(terraform): record linux/darwin hashes in deployment-checks lock file The lock file held a single h1 hash for hashicorp/http 3.5.0 (one platform), so `terraform init -lockfile=readonly` on the linux_amd64 CI runner could not verify the downloaded package and `terraform test` failed in the new "Test /health gate modules" step. Regenerated with `terraform providers lock -platform=linux_amd64 -platform=darwin_arm64 -platform=darwin_amd64`; the provider version is unchanged. Refs #649 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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…ness (#1024) * fix(gcp): exclude uninitialized replicas from GKE and Cloud Run readiness After #488 added /ready (503 until the replica has completed initialization), the GCP traffic-admission probes still gated on /health, which answers 200 on a cold replica. - GKE: new readiness_probe_path variable (default /ready) drives the readinessProbe; the liveness probe stays on health_check_path (/health) so a slow init does not get the pod restarted. - Cloud Run: the startup probe (Cloud Run's admission gate) now checks /ready, with its failure budget widened from 3 to 24 x 10 s so a slow-but-recovering init (120 s default migration timeout plus connect retries) does not restart-loop the container. Liveness stays on /health. - Static Go tests over the module sources pin both probe paths, the variable defaults and the startup window bounds. Closes #648 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * fix(ci): gate the GCP deploy on /ready via wait-for-healthy.sh The GCP test-deployment job still used the pre-#488 inline smoke gate: warm up /api/auth/check-admin, then parse the /health body. The two requests could land on different Cloud Run instances, and /health is a liveness signal. Replace both inline steps with scripts/wait-for-healthy.sh against /ready, with the same fast-gate (1 of 5) and rollout smoke-gate (3 in a row within 30) parameters deploy-azure.yml uses since #646. Refs #648 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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* fix(aws): gate Fargate ALB traffic admission on /ready The ALB target group health check used /health, which answers HTTP 200 even while a task is still initializing, so the ALB routed production traffic to cold Fargate tasks. Point it at /ready (503 until this task has finished database initialization, added in #646) and keep the ECS container health check, which is liveness, on /health. ECS also replaces tasks the target group reports unhealthy, so add a health_check_grace_period_seconds (default 300s) to the ECS service; without it a task still connecting to the database or running migrations would be killed before it could become ready. The deploy smoke gate drops the /api/auth/check-admin warm-up and the /health body parse and runs scripts/wait-for-healthy.sh against /ready, mirroring deploy-azure.yml. Closes #647 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * fix(aws): reject redirects in the readiness gate and gate on the served URL Review of #1025 found the Fargate smoke gate could pass vacuously: with HTTPS enabled the port 80 listener answers 301 on every path, and scripts/wait-for-healthy.sh (curl --fail-with-body, no -L) counted any status below 400 as ready. - wait-for-healthy.sh: only 2xx counts as ready. A 3xx is not ready and is logged with its redirect target (%{redirect_url}); redirects are not followed. Non-2xx bodies are still printed. Tests add 301 stub cases and a real-curl 301 server case (the reviewer's repro), which fail against the old script. - New fargate_app_url output: https on the api-<env> alias (covered by the listener's wildcard cert) when HTTPS is enabled, otherwise http on the ALB DNS name. test-deployment gates on it instead of the bare ALB DNS name. - Target group unhealthy_threshold default 3 -> 6 (about 180s of failing /ready at the 30s interval before ECS replaces a task), so a short database blip or Multi-AZ failover does not cycle every task. - First gate budget 10 -> 30 attempts (300s), covering the ECS grace period. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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Summary
Closes #488.
Azure readiness admitted HTTP server processes before their lazy database initialization completed:
/healthanswered HTTP 200 with"degraded"in the body, and both the Container Apps/AKS readiness probes and the deploy smoke gate treated that as ready. A successful warm-up request only initialized whichever replica the load balancer picked, so the next request could hit a still-cold replica — which is exactly what the main-branch Azure smoke test recorded (~167 ms between a healthy gate answer and a degraded smoke response).What changed
/readyendpoint as the traffic-admission contract — 503 until this process has completed required initialization, sharing onecollectHealthpipeline with/healthso the two can never drift./healthstays the liveness contract (always 200, verdict in the body). Lambda is untouched: no/readyroute, lazy init retained.dbMuforever), so readiness no longer depends on user traffic arriving.collectHealthsnapshots the store pointers underdbMuTryLockinstead of racingensureDB; while initialization holds the lock the store checks reportpendingrather than reading half-written state or blocking behind migrations.scripts/wait-for-healthy.shpolls/readywith--fail-with-body(a 503 fails the attempt but still prints which dependency is pending); the warm-up request andHEALTH_WARMUP_PATHare gone.deploy-azure.ymldrops its inline copy of the polling loop and calls the script for both the fast-fail gate and the rollout-race streak gate./ready; liveness/startup probes stay on/health. nginx proxies/readyto the backend so it can't fall through to the SPA catch-all (which would answer 200 withindex.html).Verification
internal/server/readiness_test.go(new): cold replica answers 503 while a warmed sibling answers 200; permanent init failure stays 503; failed/pending/disabled migration facets;/healthstays 200 while degraded;/readyregistered on the real mux; retry loop retries transient failures, stops on cancelled context, and answers 503 without blocking whiledbMuis held.go test ./internal/server/ -count=1 -race— clean.scripts/test-wait-for-healthy.sh— 19/19 (the offline curl stub now rejects-fwith--fail-with-body, and two checks run the real curl against throwaway localhost 200/503 servers), including a faithful replay of the pre-fix inline loop showing it passed the rollout-race scenario on the first healthy response (the admission bug), and the new gate passing that same scenario only after 3 consecutive ready answers.Behavior notes
/readyanswers 503 only while a migration run ispending. Afailedrun is still reported asdegradedin the/healthand/readybodies but answers 200, becauseensureDBnever retries migrations: 503 would pull every replica after one transient error with nothing to bring them back./readygating is Azure-only. Only the Azure probes, nginx and the Azure deploy gate use/ready. Background initialization now runs at boot in every non-LambdaStartHTTPServerprocess (AWS Fargate, GCP Cloud Run/GKE, docker-compose), which still probe/health.Out of scope (follow-up issues to be filed)
The same bug class survives on the other platforms: AWS Fargate ALB target-group health check, GKE readiness probe, Cloud Run startup probe, and the AWS/GCP deploy smoke gates still use the old warm-up + body-parse pattern; the
deployment-checksTerraform module and the Azure/GCP uptime monitors assert only HTTP 200 on/health, which is now tautological.Summary by CodeRabbit
New Features
Bug Fixes