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feat: implement statefulset primitive#25

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sourcehawk merged 34 commits intomainfrom
feature/statefulset-primitive
Mar 25, 2026
Merged

feat: implement statefulset primitive#25
sourcehawk merged 34 commits intomainfrom
feature/statefulset-primitive

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@sourcehawk sourcehawk commented Mar 22, 2026

Implements the statefulset Kubernetes resource primitive following the pattern established by the existing ConfigMap and Deployment primitives.

Summary

  • Adds statefulset primitive package under pkg/primitives/statefulset/
  • Implements required lifecycle interfaces
  • Includes editors, mutator, flavors, and builder
  • Updates shared documentation (docs/primitives.md) to list the new primitive

Checklist

  • Compiles cleanly
  • Tests pass
  • Follows naming conventions in CONTEXT.md
  • Shared file modifications are limited to documentation updates, Makefile (adding the statefulset example target), and a new StatefulSetSpecEditor in pkg/mutation/editors/

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Pull request overview

Adds a new statefulset workload primitive to the operator-component-framework, matching the existing primitive patterns (builder/resource, mutation planning, flavors, and lifecycle handlers), plus accompanying editor support, docs, and an end-to-end example.

Changes:

  • Introduces pkg/primitives/statefulset/ with builder/resource, mutator, handlers, and flavors (plus tests).
  • Adds StatefulSetSpecEditor under pkg/mutation/editors/ (plus tests) to support typed spec mutations.
  • Adds documentation and a runnable example demonstrating the new primitive.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 5 comments.

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File Description
pkg/primitives/statefulset/resource.go Implements the StatefulSet resource wrapper and default field applicator behavior.
pkg/primitives/statefulset/mutator.go Adds the statefulset mutator with feature-bounded planning and apply ordering (incl. VCT ops).
pkg/primitives/statefulset/handlers.go Provides default converge/grace/suspend handlers for StatefulSets.
pkg/primitives/statefulset/flavors.go Adds field-application flavors for preserving labels/annotations (object + pod template).
pkg/primitives/statefulset/builder.go Provides fluent builder API wiring defaults, mutations, flavors, and handlers.
pkg/primitives/statefulset/mutator_test.go Tests mutator semantics (ordering, snapshots, presence ops, convenience helpers).
pkg/primitives/statefulset/handlers_test.go Tests default handler behavior for converge/grace/suspension.
pkg/primitives/statefulset/flavors_test.go Tests flavor ordering and preservation semantics.
pkg/primitives/statefulset/builder_test.go Tests builder validation and option wiring.
pkg/mutation/editors/statefulsetspec.go Introduces a typed editor for appsv1.StatefulSetSpec.
pkg/mutation/editors/statefulsetspec_test.go Verifies StatefulSetSpecEditor setters and Raw() behavior.
examples/statefulset-primitive/main.go Runnable example using a fake client to reconcile across spec changes and suspension.
examples/statefulset-primitive/resources/statefulset.go Builds a StatefulSet resource with mutations, flavors, custom handlers, and data extraction.
examples/statefulset-primitive/features/mutations.go Example feature mutations demonstrating container edits/presence and metadata edits.
examples/statefulset-primitive/features/flavors.go Example custom flavors and custom converge/grace/suspend behaviors.
examples/statefulset-primitive/app/owner.go Re-exports shared example CRD types for the example package.
examples/statefulset-primitive/app/controller.go Example controller wiring the component framework to the statefulset primitive.
examples/statefulset-primitive/README.md Documentation on running and understanding the example.
docs/primitives/statefulset.md User-facing docs for the new statefulset primitive API and behavior.

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Pull request overview

Copilot reviewed 20 out of 20 changed files in this pull request and generated 2 comments.

@sourcehawk
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Claude Review Cycle 1 Complete

Addressed:

  • Fixed duplicated word in Mutate comment: "custom customFieldApplicator" → "custom field applicator" (resource.go:71)
  • Fixed incorrect status name in ConvergingStatus comment: "Ready" → "Healthy" to match concepts.AliveConvergingStatusHealthy (resource.go:89)

Intentionally ignored:
None

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Copilot AI review requested due to automatic review settings March 22, 2026 19:48
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Pull request overview

Copilot reviewed 20 out of 20 changed files in this pull request and generated 1 comment.

@sourcehawk
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Claude Review Cycle 1 Complete

Addressed:

  • mutator.go:452 — VolumeClaimTemplate ops now guarded by ResourceVersion == "" check so they are skipped on existing StatefulSets (immutable after creation). Added test covering the update scenario.

Intentionally ignored:
None

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approve

Copilot AI review requested due to automatic review settings March 23, 2026 03:00
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Pull request overview

Copilot reviewed 20 out of 20 changed files in this pull request and generated 2 comments.

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Claude Review Cycle 1 Complete

Addressed:

  • Fixed range variable pointer bug in mutator_test.go:52findEnv now iterates by index (&env[i]) instead of taking the address of the reused range variable (&e)
  • Updated capabilities table in docs/primitives/statefulset.md to align with actual implementation: removed claim of Failing status, replaced "Graceful rollouts" with "Rollout health", and clarified that grace handler returns Degraded/Down without grace-period timing logic

Intentionally ignored:
None

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Copilot AI review requested due to automatic review settings March 23, 2026 16:06
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Pull request overview

Copilot reviewed 20 out of 20 changed files in this pull request and generated 3 comments.

Copilot AI review requested due to automatic review settings March 23, 2026 16:59
@sourcehawk
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Claude Review Cycle 1 Complete

Addressed:

  • Added comprehensive resource-level tests for the StatefulSet primitive (Identity, Object deep-copy, Mutate, feature ordering, ConvergingStatus, GraceStatus, DeleteOnSuspend, Suspend, SuspensionStatus, ExtractData, CustomFieldApplicator) — aligning test coverage with the Deployment primitive.

Intentionally ignored:

  • PreserveStatus comment (resource.go line 28): Already addressed in a prior commit — generic.PreserveStatus(current, original) is already called on line 25, with a dedicated test (TestDefaultFieldApplicator_PreservesStatus) verifying the behavior.
  • PR description checklist comment (statefulsetspec.go line 20): This is a documentation/process note about updating the PR description to clarify that pkg/mutation/editors/statefulsetspec.go is a new shared file. Not a code change — left for the PR author to update the description if desired.

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Claude Review Cycle 1 - Follow-up Fix

The PreserveStatus fix in resource.go and corresponding docs update were uncommitted local changes that were not included in the previous push. This caused TestDefaultFieldApplicator_PreservesStatus to fail in CI.

Fixed in commit 75657adgeneric.PreserveStatus(current, original) is now properly committed and CI is green.

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Pull request overview

Copilot reviewed 20 out of 20 changed files in this pull request and generated 2 comments.

sourcehawk and others added 6 commits March 23, 2026 20:16
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Adds builder, resource, mutator, flavors, and handlers for the StatefulSet
workload primitive, following the same patterns as the Deployment primitive.

Key differences from Deployment:
- DefaultFieldApplicator preserves VolumeClaimTemplates (immutable after creation)
- Mutator supports EnsureVolumeClaimTemplate/RemoveVolumeClaimTemplate operations
- EditStatefulSetSpec provides typed access to StatefulSet-specific fields
- VCT operations run after all container edits in the apply order

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Demonstrates building a StatefulSet with feature mutations, flavors,
custom status handlers, suspension logic, and data extraction.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Align StatefulSet mutator's EditContainers docstring with the deployment
mutator by documenting that selectors target baseline/presence-added
containers and should not rely on earlier edits changing match results.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Claude Review Cycle 1 Complete

Addressed:
None

Intentionally ignored:

  • mutator.go:89 (EditContainers doc comment): The comment suggests expanding the snapshot-based selector matching docs "as is done in the deployment mutator," but the deployment mutator (pkg/primitives/deployment/mutator.go:87-92) has identical doc comments to the statefulset mutator. Applying the suggestion only to statefulset would create an inconsistency between the two primitives. The existing docs already convey the same information (snapshot evaluation + edits don't affect selector matching) in the same style used across the codebase.

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@sourcehawk sourcehawk requested review from Copilot and removed request for Copilot March 24, 2026 17:19
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Pull request overview

Copilot reviewed 21 out of 21 changed files in this pull request and generated 3 comments.

Comment on lines +35 to +38
res, _ := NewBuilder(desired).
WithFieldApplicationFlavor(PreserveCurrentLabels).
Build()

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These subtests ignore the error returned by Build(). If builder validation fails, the test will panic later (nil res) or hide the real failure. Please assert require.NoError(t, err) and only proceed when res is non-nil.

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Comment on lines +64 to +68
res, _ := NewBuilder(desired).
WithFieldApplicationFlavor(flavor1).
WithFieldApplicationFlavor(flavor2).
Build()

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The error returned by Build() is ignored here. Please capture it and use require.NoError(t, err) so the test fails with the correct cause if builder validation/configuration is broken.

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Comment on lines +81 to +84
res, _ := NewBuilder(desired).
WithFieldApplicationFlavor(flavor).
Build()

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Build()'s returned error is ignored. Please assert it with require.NoError before using res, otherwise the test may fail with a nil dereference instead of the underlying build error.

Copilot uses AI. Check for mistakes.
Capture and assert the error from Build() with require.NoError in all
three TestMutate_OrderingAndFlavors subtests so that a builder failure
surfaces as a clear test error instead of a nil-pointer panic.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Claude Review Cycle 2 Complete

Addressed:

  • flavors_test.go:38 — Assert require.NoError(t, err) on Build() in "flavors run after baseline applicator" subtest
  • flavors_test.go:68 — Assert require.NoError(t, err) on Build() in "flavors run in registration order" subtest
  • flavors_test.go:84 — Assert require.NoError(t, err) on Build() in "flavor error is returned with context" subtest

Intentionally ignored:
None

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Pull request overview

Copilot reviewed 21 out of 21 changed files in this pull request and generated 1 comment.

Comment on lines +11 to +12
- **Custom Status Handlers**: Overriding the default logic for determining readiness (`ConvergeStatus`) and health
assessment during rollouts (`GraceStatus`).
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The README references ConvergeStatus, but the framework/API uses ConvergingStatus (and the builder hook is WithCustomConvergeStatus). Please update the wording so readers can find the correct method/type names.

Suggested change
- **Custom Status Handlers**: Overriding the default logic for determining readiness (`ConvergeStatus`) and health
assessment during rollouts (`GraceStatus`).
- **Custom Status Handlers**: Overriding the default logic for determining readiness (via `ConvergingStatus` and the
`WithCustomConvergeStatus` builder hook) and health assessment during rollouts (`GraceStatus`).

Copilot uses AI. Check for mistakes.
Update `ConvergeStatus` to `ConvergingStatus` and mention the
`WithCustomConvergeStatus` builder hook so readers can find the
correct method/type names in the codebase.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
@sourcehawk
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Claude Review Cycle 3 Complete

Addressed:

  • Fixed README.md line 11-12: Updated ConvergeStatus to ConvergingStatus and added mention of the WithCustomConvergeStatus builder hook so readers can find the correct method/type names.

Intentionally ignored:
None

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Pull request overview

Copilot reviewed 21 out of 21 changed files in this pull request and generated 3 comments.

Comment on lines +26 to +33
## Running the Example

You can run this example directly using `go run`:

```bash
go run examples/statefulset-primitive/main.go
```

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This PR adds a new example, but the repository’s make run-examples target runs an explicit list of go run ./examples/<name>/. commands (Makefile:114-119) and currently won’t exercise statefulset-primitive. Consider updating the Makefile so the new example is covered by the standard example run target.

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Comment on lines +81 to +86
}

res, err := NewBuilder(desired).
WithFieldApplicationFlavor(flavor).
Build()
require.NoError(t, err)
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These tests ignore the error returned by Build() (using res, _ := ...). If Build fails, the assertions on the error message may be misleading because the failure could be from Build rather than Mutate; assert require.NoError(t, err) on Build and then check the Mutate error.

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Comment on lines +7 to +15
// StatefulSetSpecEditor provides a typed API for mutating a Kubernetes StatefulSetSpec.
type StatefulSetSpecEditor struct {
spec *appsv1.StatefulSetSpec
}

// NewStatefulSetSpecEditor creates a new StatefulSetSpecEditor for the given StatefulSetSpec.
func NewStatefulSetSpecEditor(spec *appsv1.StatefulSetSpec) *StatefulSetSpecEditor {
return &StatefulSetSpecEditor{spec: spec}
}
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PR description/checklist says shared file modifications are limited to documentation updates, but this PR adds a new shared editor (StatefulSetSpecEditor) under pkg/mutation/editors (plus examples and a new primitive). Please update the PR description/checklist to reflect the actual scope so reviewers know to expect shared Go code changes.

Copilot uses AI. Check for mistakes.
The new statefulset-primitive example was not included in the
run-examples target, so it was not exercised by `make run-examples`.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Claude Review Cycle 4 Complete

Addressed:

  • Added statefulset-primitive to the run-examples Makefile target (examples/statefulset-primitive/README.md:33 comment)

Intentionally ignored:

  • flavors_test.go Build() error assertion: Already addressed in commit ec8729d — all Build() calls already have require.NoError(t, err) checks
  • PR description/checklist scope update (statefulsetspec.go:15 comment): This is a PR metadata concern, not a code change. The PR author should update the description to reflect that shared Go code (StatefulSetSpecEditor) was added under pkg/mutation/editors/

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Pull request overview

Copilot reviewed 22 out of 22 changed files in this pull request and generated no new comments.

sourcehawk and others added 4 commits March 24, 2026 17:51
Align StatefulSet mutator with deployment/configmap: NewMutator no
longer creates an initial feature plan. BeginFeature must be called
before registering any mutations.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Align the statefulset primitive with the framework's move to
Server-Side Apply. DefaultFieldApplicator, WithCustomFieldApplicator,
WithFieldApplicationFlavor, and all flavor helpers are removed.
The generic builder constructor call drops the defaultApplicator
parameter. Tests now pass Object() output to Mutate() instead of
empty structs. Docs and examples are updated accordingly.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Pull request overview

Copilot reviewed 20 out of 20 changed files in this pull request and generated 1 comment.

Comment on lines 122 to 126
run-examples: ## Run all examples to verify they execute without error.
go run ./examples/deployment-primitive/.
go run ./examples/configmap-primitive/.
go run ./examples/statefulset-primitive/.
go run ./examples/custom-resource-implementation/.
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The PR description/checklist states “Shared file modifications are limited to documentation updates”, but this PR also changes the Makefile (adds the new example to run-examples). Either update the PR description/checklist to reflect this, or move this change out if it’s intentionally out-of-scope.

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sourcehawk and others added 2 commits March 25, 2026 15:46
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Pull request overview

Copilot reviewed 20 out of 20 changed files in this pull request and generated 1 comment.

Comment on lines +248 to +256
// EnsureVolumeClaimTemplate records that a PersistentVolumeClaim template must be
// present in the StatefulSet. If a VolumeClaimTemplate with the same name exists,
// it is replaced; otherwise, it is appended.
//
// Note: VolumeClaimTemplates are immutable once the StatefulSet exists in the cluster.
// Changes to VolumeClaimTemplates on an existing StatefulSet will be rejected by
// the Kubernetes API server. This method is primarily useful for initial creation
// or when recreating a StatefulSet.
func (m *Mutator) EnsureVolumeClaimTemplate(pvc corev1.PersistentVolumeClaim) {
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The GoDoc for EnsureVolumeClaimTemplate says changes on an existing StatefulSet will be rejected by the API server, but this mutator currently skips all volumeClaimTemplateOps when ResourceVersion is non-empty (see Apply). That makes the behavior a silent no-op rather than an API rejection. Update the comment (and/or method docs) to explicitly state that these ops are ignored for existing resources (and when that “existing” determination applies in this framework).

Copilot uses AI. Check for mistakes.
Clarify that VolumeClaimTemplate operations are silently skipped for
existing resources (non-empty ResourceVersion) during Apply, rather than
stating they would be rejected by the API server.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Claude Review Cycle 1 Complete

Addressed:

  • mutator.go:256 — Updated GoDoc for EnsureVolumeClaimTemplate and RemoveVolumeClaimTemplate to accurately state that volumeClaimTemplate operations are silently skipped for existing resources (non-empty ResourceVersion) during Apply, rather than misleadingly claiming the API server would reject them.

Intentionally ignored:
None

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Pull request overview

Copilot reviewed 20 out of 20 changed files in this pull request and generated 4 comments.

Comment on lines +90 to +98
func (m *Mutator) EditContainers(selector selectors.ContainerSelector, edit func(*editors.ContainerEditor) error) {
if selector == nil || edit == nil {
return
}
m.active.containerEdits = append(m.active.containerEdits, containerEdit{
selector: selector,
edit: edit,
})
}
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All mutation registration methods dereference m.active, but m.active is only set by BeginFeature(). Calling EditContainers (and similarly EnsureContainer, EditPodSpec, etc.) before BeginFeature() will deterministically panic with a nil-pointer dereference. Consider enforcing the invariant by either: (a) calling BeginFeature() in NewMutator, (b) lazily creating a plan when m.active == nil, or (c) returning a descriptive error (requires changing method signatures) / explicit panic with a clear message.

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Comment on lines +117 to +124
| Editor | Scope |
| ----------------------- | ----------------------------------------------------------------------- |
| `ContainerEditor` | Environment variables, arguments, resource limits, ports |
| `PodSpecEditor` | Volumes, tolerations, node selectors, service account, security context |
| `DeploymentSpecEditor` | Replicas, update strategy, label selectors |
| `StatefulSetSpecEditor` | Replicas, service name, pod management policy, update strategy |
| `ConfigMapDataEditor` | `.data` entries — set, remove, deep-merge YAML patches, raw access |
| `ObjectMetaEditor` | Labels and annotations on any Kubernetes object |
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These tables use || as the row prefix, which in Markdown creates an empty first column and can render incorrectly (especially now that the indentation was removed). Converting these to standard Markdown table rows starting with a single | (and ensuring consistent column separators) will make the docs render as intended. The same formatting issue also appears in the 'Built-in Primitives' table further down in this file.

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Comment on lines +9 to +14
| Capability | Detail |
| --------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Health tracking** | Verifies `ObservedGeneration` matches `Generation` before evaluating `ReadyReplicas`; reports `Healthy`, `Creating`, `Updating`, or `Scaling`; grace handler can mark Down/Degraded |
| **Rollout health** | Surfaces stalled or failing rollouts by transitioning the resource to `Degraded` or `Down` (no grace-period timing) |
| **Suspension** | Scales to zero replicas; reports `Suspending` / `Suspended` |
| **Mutation pipeline** | Typed editors for metadata, statefulset spec, pod spec, containers, and volume claim templates |
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The capability table (and other tables in this new doc) use || prefixes, which typically renders as an extra empty column in Markdown. Switching table rows to start with a single | will avoid the empty-column artifact and improve rendering consistency across Markdown viewers.

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run-examples: ## Run all examples to verify they execute without error.
go run ./examples/deployment-primitive/.
go run ./examples/configmap-primitive/.
go run ./examples/statefulset-primitive/.
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The PR description/checklist states that 'Shared file modifications are limited to documentation updates', but this PR also changes shared/non-doc files (e.g., Makefile and pkg/mutation/editors/statefulsetspec.go). Either update the PR description/checklist item to reflect the actual scope, or move these non-doc changes into a separate PR if that restriction is important for review/release processes.

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Claude Review Cycle 1 Complete

Addressed:

  • Updated PR description/checklist to accurately reflect shared file modifications (Makefile and StatefulSetSpecEditor) per Copilot comment on Makefile:125

Intentionally ignored:

  • mutator.go:98 — nil pointer on m.active: BeginFeature() is always called by the framework's ApplyMutations helper before any mutation method runs. The Mutator is not called directly by users — it is an internal contract enforced by the generic mutation pipeline. The deployment primitive uses the identical pattern. Adding a guard here but not in deployment would be inconsistent; changing both is a framework-wide decision outside the scope of this PR.
  • docs/primitives.md:124 — || table prefixes: Invalid. The tables use standard single | Markdown prefixes. No || exists anywhere in the docs directory.
  • docs/primitives/statefulset.md:14 — || table prefixes: Invalid. Same as above — all tables use correct single | syntax.

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Pull request overview

Copilot reviewed 20 out of 20 changed files in this pull request and generated no new comments.

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