spec(control-plane): gate gateway re-provisioning on desired-state convergence - #151
spec(control-plane): gate gateway re-provisioning on desired-state convergence#151markturansky wants to merge 7 commits into
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Amber Analysis This PR establishes the right architectural foundation for preventing spec-change drift by keying the provisioning gate on desired-state convergence ( To ensure clean downstream implementation across the API server, OpenAPI schemas, and gRPC stubs, here are three recommended spec clarifications and the corresponding implementation blueprint: Recommended Spec Clarifications
Downstream Implementation Blueprint1. REST API (
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Thanks @jhjaggars — all three addressed in 6034dcd (spec-only):
The downstream implementation blueprint matches the intended |
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WalkthroughThe specifications add Gateway ChangesGateway generation convergence
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to The specification adds generation-based reprovisioning, but it does not yet define how supervisor_image is persisted, how existing Gateways are backfilled, or how omitted observed_generation is preserved during health-only updates. These gaps could leave live gateways stale or reject valid health updates; the PR is mergeable with explicit owner follow-up. Suggested reviewers: 🚥 Pre-merge checks | ✅ 11✅ Passed checks (11 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@specs/platform/control-plane.spec.md`:
- Line 98: Update GatewayReconciler.Handle to gate re-application on generation
convergence rather than phase: only skip when observed_generation equals
generation, while allowing desired-spec changes through regardless of phase.
After manifest application succeeds, persist the exact applied generation as
observed_generation, while continuing to reconcile health/status updates for all
Gateway phases.
In `@specs/platform/data-model.spec.md`:
- Around line 220-252: Update the UpdateGateway handler to process
observed_generation from UpdateGatewayRequest only for authenticated
control-plane callers. Validate that the value is no greater than the current
generation and no less than the current observed_generation, reject unauthorized
or out-of-range writes, and assign valid values while preserving existing
control-plane updates.
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specs/platform/control-plane.spec.mdspecs/platform/data-model.spec.mdspecs/platform/openshell-gateway-health.spec.md
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The provisioning gate currently skips re-applying manifests for any Gateway in phase Running/Provisioning/Degraded. This masks drift: a spec change to a Running gateway (new image, route, DNS SANs, OIDC) is never re-applied, yet the gateway keeps reporting Running/Healthy so it looks converged when it is not. Introduce a desired-state generation primitive and re-key the gate on it: - data-model: add `generation` (API-server-incremented on any desired-spec change) and `observed_generation` (control-plane-owned, last successfully applied) to Gateway; a Gateway is converged when they are equal. `generation` is read-only across all client-facing REST/gRPC contracts; `observed_generation` is read-only in REST/create but control-plane-writable via UpdateGatewayRequest. New gateways initialize generation=1, observed_generation=0 so they are never spuriously converged. observed_generation writes are bounded to a monotonic latch (current <= new <= generation), rejecting regressions and overshoot. - health: replace "Health Reconciliation Not Suppressed By Phase" with "Provisioning Gate Keyed On Desired State" -- skip re-apply only when converged; re-provision on generation advance regardless of phase; set observed_generation on success, leave it on failure to retry. Health phase/status updates remain unsuppressed. - control-plane: Status Synchronization now gates re-application on convergence, not phase, with a spec-change-to-Running scenario. Scope: closes spec-change drift only. Periodic re-apply to heal out-of-band edits to managed resources is intentionally left out pending a separate decision. Assisted-by: Claude Opus 4.8 <noreply@anthropic.com>
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Inline comments:
In `@specs/platform/data-model.spec.md`:
- Around line 100-101: Add supervisor_image to the Gateway entity model
alongside generation and observed_generation, matching the existing type and
naming defined by the desired-spec and provisioning sections. Ensure the Gateway
ER model reflects that this persisted field participates in generation updates.
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specs/platform/data-model.spec.md
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| int generation | ||
| int observed_generation |
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🗄️ Data Integrity & Integration | 🟡 Minor | ⚡ Quick win
Add supervisor_image to the Gateway entity model.
The generation requirement lists supervisor_image as a desired-spec field at Lines 208-213, and the provisioning table defines it at Line 182. The Gateway ER entity does not list it. Add the field or state why it is not persisted. Otherwise, implementers can omit a field that must advance generation.
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In `@specs/platform/data-model.spec.md` around lines 100 - 101, Add
supervisor_image to the Gateway entity model alongside generation and
observed_generation, matching the existing type and naming defined by the
desired-spec and provisioning sections. Ensure the Gateway ER model reflects
that this persisted field participates in generation updates.
Add the desired-state convergence primitive to the Gateway API surface: - OpenAPI: `generation` and `observed_generation` (int64, readOnly) on the Gateway response schema; omitted from create/patch (client-read-only). - proto: `int64 generation = 21` and `optional int64 observed_generation = 22` on Gateway; `optional int64 observed_generation = 20` on UpdateGatewayRequest (control-plane write-back channel). Not on CreateGatewayRequest. Regenerates pkg/api/openapi and pkg/api/grpc stubs. No behavior wired yet. Assisted-by: Claude Opus 4.8 <noreply@anthropic.com>
Wire the generation primitive through the backend and gRPC: - model: add Generation/ObservedGeneration (int64); BeforeCreate initializes generation=1, observed_generation=0 so a new Gateway is never spuriously converged. Migration adds both columns (default 1 -> existing rows converged). - service.Replace centralizes ownership: increments generation iff a desired-spec field changed (identity/observed fields excluded via desiredStateChanged), never trusting a client-supplied generation; and enforces observed_generation as a monotonic latch, rejecting a write below the current value or above the (possibly advanced) generation with 400. - gRPC UpdateGateway accepts observed_generation (control-plane write-back); REST/gRPC presenters surface both fields. Unit tests cover BeforeCreate init and desiredStateChanged field selection. Assisted-by: Claude Opus 4.8 <noreply@anthropic.com>
Adds Generation/ObservedGeneration (int64) to the Gateway type from the updated OpenAPI contract. Assisted-by: Claude Opus 4.8 <noreply@anthropic.com>
Adds generation/observed_generation to the Gateway type from the updated OpenAPI contract. Assisted-by: Claude Opus 4.8 <noreply@anthropic.com>
Replace the phase gate in GatewayReconciler.Handle with a convergence gate: skip re-applying manifests only when the Gateway is converged (observed_generation == generation). A desired-spec change advances generation past observed_generation, so it now falls through the gate and re-provisions regardless of Running/Provisioning/Degraded phase. After ReconcileGateway succeeds, write observed_generation = generation via the gRPC back-channel, marking the Gateway converged. On apply failure the write is skipped so the change is retried. Health phase/status updates are unchanged. Assisted-by: Claude Opus 4.8 <noreply@anthropic.com>
Record DM-8 (Gateway Generation Tracking) and CP-2j (convergence-gated re-provisioning) as Present, and add the GEN wave history entry for the downstream implementation of PR #151. Assisted-by: Claude Opus 4.8 <noreply@anthropic.com>
Amber reviewStatus: Complete VerdictRequest changes (delivered as a COMMENT-event review per the Amber review protocol). The convergence-gate design is sound and well-documented, but there is one high-impact correctness risk: the GORM Hi, Amber here. This is a clean, thoughtfully-commented change that replaces the phase-based provisioning gate with a Blocker / Critical1. Major2. PR description says "spec only", but the PR contains the full implementation (Major, reviewability). Minor3. 4. Test Diff ScrutinyNo modified assertions in pre-existing tests — |
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Verdict
Request changes (delivered as a COMMENT-event review per the Amber review protocol). The convergence-gate design is sound and well-documented, but there is one high-impact correctness risk: the GORM default:1 tag on observed_generation very likely defeats BeforeCreate's ObservedGeneration = 0, which would persist new gateways as already-converged and stop them from ever being provisioned. There are also material cross-PR coordination points (notably #179, #200, #185, #194) that maintainers should resolve before/at merge.
Hi, Amber here. This is a clean, thoughtfully-commented change that replaces the phase-based provisioning gate with a generation/observed_generation convergence gate to close the spec-change drift-masking bug. The API-server ownership split (API server increments generation on desired-spec change, control plane is the sole writer of observed_generation), the advisory-locked read-modify-write in service.Replace, and the monotonic range validation are all correct patterns. My main concern is a GORM persistence pitfall on the new field, plus a scope/description mismatch and several cross-PR interactions.
Blocker / Critical
1. default:1 on observed_generation likely overrides BeforeCreate's 0, marking new gateways converged (Critical, confidence Medium-High).
model.go:36 tags ObservedGeneration int64 with gorm:"not null;default:1", while BeforeCreate (model.go:59) sets d.ObservedGeneration = 0. GORM treats a zero-valued field that has a default tag as "unset": on Create it omits the column from the INSERT and lets the DB default (1) apply, then backfills the struct via RETURNING. dao.go:52 uses a plain Create, so a freshly created gateway would very likely persist observed_generation = 1 = generation = 1 → converged → the reconciler skips provisioning entirely (reconciler.go:267 gate). The added test only exercises the in-memory struct after BeforeCreate, so it wouldn't catch this. Recommend: drop default:1 from the model field for observed_generation (set the DB default to 0, or omit the default and keep the explicit BeforeCreate assignment), and handle existing-row backfill to 1 explicitly in the migration via a raw UPDATE/UpdateColumn rather than a struct default. Add an integration test that creates a gateway and asserts the persisted observed_generation == 0.
Major
2. PR description says "spec only", but the PR contains the full implementation (Major, reviewability).
The body states "## Change (spec only)" and lists the proto + DB migration + reconciler.go gate change under "Downstream (next, via /reconcile — not in this PR)". In fact this PR ships all of it: a new DB migration, proto/gRPC contract fields, generated SDKs, service.Replace generation logic, and the reconciler gate rewrite. Please update the description so reviewers know they are approving a schema migration, a gRPC contract change, and a live reconciler behavior change — not a spec-only doc PR.
Minor
3. desiredStateChanged is a manual field enumeration — add a guard against future drift (Minor).
service.go:148 lists each desired-spec field by hand. If a new desired field is later added to Gateway and someone forgets to add it here, generation won't advance on changes to that field and drift will be silently masked again — the exact bug this PR fixes. Consider a comment/table-test that fails when a new desired field is added, or a struct-tag-driven comparison.
4. updateObservedGeneration swallows the gRPC write error (Minor, acceptable-by-design but worth noting).
reconciler.go:453 only logs WARN when the observed_generation write fails. This is safe because the gateway stays unconverged and re-applies next event (idempotent), but per the "never silently swallow partial failures" convention it's worth an explicit comment that the failure is intentionally soft because convergence retries on the next event.
Test Diff Scrutiny
No modified assertions in pre-existing tests — model_test.go changes are purely additive (TestBeforeCreateInitializesGenerationUnconverged, TestDesiredStateChanged). The migration backfills existing rows to observed_generation = 1 (converged), which is a reasonable, explicit backfill for the optional→tracked transition (new gateways are correctly intended to start unconverged). No removed guarantees.
Cross-PR coordination
I reviewed the other open PRs in openshift-online/hypershell. Open PRs at review time: #216, #214, #212, #211, #210, #209, #208, #207, #206, #201, #200, #194, #189, #188, #185, #182, #179, #150, #148, #135, #109, #75, #73. Material conflicts / coordination points with #151:
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#179
fix(control-plane): reconcile existing Keycloak clients on gated gateways— DIRECT conflict, same code. Both PRs edit the exact phase-gate block inGatewayReconciler.Handle(reconciler.go). #179 keeps the phase gate (Running/Provisioning/Degraded) and inserts a lightweight Keycloak drift reconciliation before the early return; #151 replaces that phase gate with the convergence gate (observed_generation == generation). #179's own description has a "PR #151 interaction" section acknowledging this: it says its helper "should be called inside that convergence-gate branch" once #151 lands, and that its handler fixtures "should then represent convergence rather than phase-only gating." Maintainers must decide merge order and who does the integration: if #151 lands first, #179 must move its Keycloak drift pass into the converged branch (converged gateways still need Keycloak drift repair, since existing rows migrate as converged). This is a real design/ordering decision, not just a text merge. -
#200
docs: define control plane reconciliation contract— overlapping/competing data model in the same specs. #200 editsspecs/platform/openshell-gateway-health.spec.mdandspecs/platform/control-plane.spec.md(both also edited by #151) and introduces an MVCC reconciliation contract based on "immutable UIDs, resource versions, generations, and conditional status." #151 introduces its owngeneration/observed_generationprimitive and rewrites the same health-spec section ("healthy phase does not suppress drift repair" vs "Provisioning Gate Keyed On Desired State"). Two PRs are defining generation-based drift semantics in the same files. Maintainers need to decide which generation model is canonical and reconcile #151's concreteGateway.generation/observed_generationfields with #200's broader resourceVersion+generation contract so they don't diverge. -
#185
docs(control-plane): specify periodic world synchronization— assumption interaction on drift. #151 explicitly defers "periodic re-apply to heal out-of-band edits … pending a separate decision." #185 appears to be that decision (periodic resync, revision-aware queues) and editsspecs/platform/control-plane.spec.mdandspecs/platform/data-model.spec.md(both edited by #151). Key interaction to resolve: #151's convergence gate makes the event-driven reconciler skip re-apply whenobserved_generation == generation, so periodic resync built on the same gate would NOT heal out-of-band drift (deleted ConfigMap, edited RBAC) unless it deliberately bypasses the convergence gate. #185 notes it "must not force Gateway phases or fight the health reconciler." Maintainers should define whether periodic resync re-applies regardless of convergence, and align the data-model additions in both PRs. -
#194
feat(control-plane): adopt upstream OpenShell Helm chart— apply mechanism vs convergence latch. #194 rewrites how the control plane applies gateway manifests (SSA → Helm SDK) and also editsreconciler.go/health.go. #151's correctness depends on writingobserved_generationonly after a successful apply (ReconcileGateway). If #194 lands, the "successful apply" boundary moves into the Helm release path, and #151'supdateObservedGenerationcall site must be re-wired to that new boundary. Coordination on ordering + where the convergence latch is set is needed. -
#207
feat: reconcile-to-request trace correlation— file overlap only, not a material design conflict. #207 touches the same gateways plugin files (model.go,migration.go,service.go,grpc_presenter.go,plugin.go) and adds another migration + pre-Replacelogic (CaptureTraceContext). The concerns are orthogonal (trace context vs generation tracking); this is a routine merge/migration-ordering coordination (two new migrations, both editingService.Replaceand theinit()migration list), not a competing design. Flagging only so whoever merges second re-runsmake generate/migration checks.
No other open PR (#211, #216, #214, #212, #210, #209, #208, #206, #201, #182, #150, #148, dependency/UI PRs) shows a material logical or plan conflict with #151.
Findings Summary (ordered by severity, highest first):
- [Critical]
default:1onobserved_generationlikely overridesBeforeCreate's0, persisting new gateways as converged and blocking provisioning — Correctness / Data Model (model.go:36, model.go:59, dao.go:52) - [Major] PR description claims "spec only" but ships migration + gRPC contract + reconciler behavior change — Reviewability / Scope (PR body)
- [Minor]
desiredStateChangedmanual field list can silently miss future desired fields — Maintainability (service.go:148) - [Minor]
updateObservedGenerationlogs-and-continues on write failure without an explicit soft-failure rationale — Error Handling (reconciler.go:453)
Convention Checklist:
| Convention | Result |
|---|---|
No panic() in production code |
Pass |
Errors wrapped with fmt.Errorf context |
Pass |
errors.IsNotFound / 404 handling |
Pass |
| No secrets in logs or responses | Pass |
| Input validated (generation range) | Pass |
| Reconcile (update-or-create), not create-or-skip | Pass |
Context propagation (stream ctx, no context.TODO()) |
Pass |
| OpenAPI client regenerated, not hand-edited | Pass |
| Conventional commit messages | Pass |
| Never silently swallow partial failures | Soft-fail (reconciler.go:453) |
| Optional→tracked field has backfill/migration | Pass (migration backfills existing rows) |
| Persisted default matches intended new-record value | Fail (model.go:36) |
| DatabaseConfig *string `json:"database_config" gorm:"type:jsonb"` | ||
| CredentialDriver *string `json:"credential_driver" gorm:"type:jsonb"` | ||
| Generation int64 `json:"generation" gorm:"not null;default:1"` | ||
| ObservedGeneration int64 `json:"observed_generation" gorm:"not null;default:1"` |
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[Critical] default:1 here likely defeats BeforeCreate's ObservedGeneration = 0 (model.go:59).
GORM treats a zero-valued field that carries a default tag as "unset": on Create it omits the column from the INSERT so the DB default (1) applies, then backfills the struct via RETURNING. dao.go:52 uses a plain Create, so a new gateway would very likely persist observed_generation = 1 = generation = 1 → converged → the reconciler skips provisioning entirely.
Fix: remove default:1 from this model field (keep not null), let BeforeCreate set 0 for new rows, and backfill existing rows to 1 with an explicit UPDATE/UpdateColumn in the migration. Add an integration test asserting the persisted observed_generation == 0 for a freshly created gateway (the current test only checks the in-memory struct).
| // (status, phase, route_address, generation, observed_generation) and identity | ||
| // fields (name, fleet_id, namespace) are excluded: they do not alter the live | ||
| // workload and must not advance generation. See data-model.spec.md. | ||
| func desiredStateChanged(current, next *Gateway) bool { |
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[Minor] Manual desired-field enumeration is a future-drift hazard.
If a new desired-spec field is later added to Gateway and not added here, generation won't advance on changes to it and drift will be silently masked again — the exact bug this PR fixes. Consider a table-driven test (or a struct-tag-driven comparison) that fails when a new desired field is introduced without being reflected here.
| ObservedGeneration: &generation, | ||
| }) | ||
| if err != nil { | ||
| log.Printf("WARN failed to update gateway %s observed_generation to %d: %v", gatewayID, generation, err) |
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[Minor] Soft-swallowed write failure — please make the rationale explicit.
Logging WARN and continuing is acceptable here because the gateway stays unconverged and re-applies on the next event (idempotent), but per the "never silently swallow partial failures" convention it's worth a one-line comment stating this is an intentional soft failure that convergence retries on the next event.
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Problem
The control plane's provisioning gate (
GatewayReconciler.Handle,reconciler.go:253) skips re-applying manifests for any Gateway in phaseRunning,Provisioning, orDegraded. The continuous health loop only observes Deployment readiness, never spec conformance. Together this masks drift:image,route,server_dns_names,oidc,database) emits an update event, butHandlereturns early onphase == "Running"— the change never reaches the cluster.Running/Healthy, so the API server shows the new desired spec and a healthy phase — it looks converged when the live workload is still on the old spec.Degradedgateway that a re-apply would fix is never re-provisioned.There is no
observedGeneration-style signal, so nothing surfaces the discrepancy.Change (spec only)
Introduces a desired-state generation primitive and re-keys the gate on convergence instead of phase:
data-model.spec.md— addgeneration(API-server-incremented on any desired-spec change) andobserved_generation(control-plane-owned, last successfully applied) to Gateway. Converged ⇔observed_generation == generation. Both read-only in REST/gRPC contracts.openshell-gateway-health.spec.md— replace "Health Reconciliation Not Suppressed By Phase" with "Provisioning Gate Keyed On Desired State": skip re-apply only when converged; re-provision on generation advance regardless of phase; setobserved_generationon success, leave it on failure to retry. Healthphase/statusupdates remain unsuppressed.control-plane.spec.md— Status Synchronization now gates re-application on convergence, not phase, with a spec-change-to-Running scenario.Scope / follow-up
Closes spec-change drift only. Periodic re-apply to heal out-of-band edits to managed resources (deleted ConfigMap, edited RBAC) — which would turn the health loop into a full reconcile loop — is intentionally left out pending a separate decision.
Downstream (next, via
/reconcile— not in this PR)generation/observed_generationon Gateway; API server incrementsgenerationon spec mutation.reconciler.go:253: gate onobserved_generation == generationinstead of phase; writeobserved_generationafter successfulReconcileGateway.🤖 Generated with Claude Code
Summary by CodeRabbit
New Features
RunningandDegradedduring provisioning.Documentation