✨ Fakeclient: Add apply support by alvaroaleman · Pull Request #2981 · kubernetes-sigs/controller-runtime

alvaroaleman · 2024-10-14T03:14:23Z

This change adds apply support into the fake client.

This relies on the upstream support for this which is implemented in a new FieldManagedObjectTracker. In order to support many types, a custom multiTypeConverter is added.

The FieldManagedObjectTracker results in ManagedFields being set after any operations. As that would be a very breaking change, the fake client will by default unset them and allows to optionally leave them.

Based on all existing tests still passing, I believe this change is fully backwards-compatible (But depends on breaking changes such as a very new client-go and apimachinery and #3228).

Fixes #2341

k8s-ci-robot · 2024-10-14T03:14:25Z

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/lifecycle stale

alvaroaleman · 2025-02-08T22:51:59Z

/lifecycle frozen
This is a requested feature so I'd like to keep this open to demonstrate the challenges. I personally will not be working further on it though.

k8s-ci-robot · 2025-02-08T22:52:01Z

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In response to this:

/lifecycle frozen
This is a requested feature so I'd like to keep this open to demonstrate the challenges. I personally will not be working further on it though.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

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/remove-lifecycle frozen

jpbetz · 2025-02-25T16:26:22Z

pkg/client/fake/typeconverter.go

+type multiTypeConverter struct {
+	upstream []managedfields.TypeConverter
+}


Providing this composite type converter seems fine.

We have a different use case for a composite type converter in the apiserver for admission: https://github.com/kubernetes/kubernetes/blob/25e11cd1c143ef136418c33bfbbbd4f24e32e529/staging/src/k8s.io/apiserver/pkg/admission/plugin/policy/mutating/patch/typeconverter.go#L37. But the use case is different, it takes a single static type converter and an openapi client, instead of multiple underlying type converters, so it is not useful here.

I'd like to ensure we keep this implementation unexported. Maybe add some godoc to that effect?

Yep makes sense, will do that

jpbetz · 2025-02-25T16:30:15Z

pkg/client/fake/client.go

 	withStatusSubresource []client.Object
 	objectTracker         testing.ObjectTracker
 	interceptorFuncs      *interceptor.Funcs
+	typeConverters        []managedfields.TypeConverter


nit: Can this simply be typeConverter managedfields.TypeConverter? When multiTypeConverter is needed, it should implement the managedfields.TypeConverter interface and so can be initialized and used here?

This is on the builder and often times it will be needed to have more than one, as both in-tree and CRs are used

pkg/client/fake/client.go

jpbetz

This looks like a good approach. Left some minor feedback then LGTM.

k8s-triage-robot · 2025-04-07T04:23:22Z

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/lifecycle rotten

pkg/client/fake/client.go

sbueringer · 2025-06-19T05:50:01Z

pkg/client/fake/client.go

 }

+// WithTypeConverters sets the type converters for the fake client. The list is ordered and the first
+// non-erroring converter is used. A type converter must be provided for all types the client is used


Under which exact circumstances must these be provided?

Only if SSA with custom types is used with the fake client? (based on the unit test it looks like Unstructured also works without setting TypeConverters)

It is always requiered if the FieldManagedObjectTracker is used, it seems to error out on all of its methods if the typeConverter doesn't handle a given type

I think I'm missing something.

So if I'm using the fake client today with my own CRDs, this will now break if I don't start setting type converters for them? This would break a lot of people

(FieldManagedObjectTracker is always used if objectTracker is not explicitly set, right?)

So if I'm using the fake client today with my own CRDs, this will now break if I don't start setting type converters for them? This would break a lot of people

No it will not break. SSA might not work correctly due to the inferencing type converter, but that is all.

Okay, can we make this slightly clearer please? The current comment is

A type converter must be provided for all types the client is used for, otherwise it will error.

I'm not sure if folks will infer that correctly otherwise

pkg/client/fake/client.go

pkg/client/fake/typeconverter.go

pkg/client/fake/client_test.go

sbueringer · 2025-06-19T06:32:37Z

Nice! Thx for working on this.

My comments are mostly around improving test coverage and godoc a bit

alvaroaleman · 2025-06-19T16:21:31Z

@tomasaschan @fsommar could you please find a different place for your comments that are not about feedback to the code changes in here to avoid polluting this? Thanks!

sbueringer · 2025-06-26T14:36:11Z

@alvaroaleman Last one from my side: #2981 (comment)

This change adds apply support into the fake client. This relies on the upstream support for this which is implemented in a new [FieldManagedObjectTracker][0]. In order to support many types, a custom `multiTypeConverter` is added. [0]: https://github.com/kubernetes/kubernetes/blob/4dc7a48ac6fb631a84e1974772bf7b8fd0bb9c59/staging/src/k8s.io/client-go/testing/fixture.go#L643

sbueringer · 2025-06-26T17:59:39Z

/lgtm
/approve

k8s-ci-robot · 2025-06-26T17:59:46Z

LGTM label has been added.

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Git tree hash: 2b9d7c67fa6bf77671bde55014a360b49b49e0fd

k8s-ci-robot · 2025-06-26T17:59:46Z

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Replace Create+AlreadyExists pattern with SSA for ResourceQuota, PDB, and workload deployment in debug_session_reconciler.go. Add ApplyTypedObject helper that converts typed k8s objects to unstructured for SSA. This is cleaner than Create+AlreadyExists and provides proper create-or-update semantics. Note: API Creates (BreakglassSession, DebugSession) are kept as-is: - AddBreakglassSession uses GenerateName (SSA needs known name) - CreateDebugSession needs AlreadyExists detection for 409 response Refs: kubernetes-sigs/controller-runtime#2981 Refs: kubernetes-sigs/controller-runtime#3321 Refs: kubernetes-sigs/controller-runtime#3253

k8s-ci-robot added do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. approved Indicates a PR has been approved by an approver from all required OWNERS files. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. labels Oct 14, 2024

k8s-ci-robot requested review from inteon and vincepri October 14, 2024 03:14

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alvaroaleman force-pushed the apply-fake branch from ac5705d to b8202b9 Compare February 23, 2025 17:56

k8s-ci-robot removed the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Feb 23, 2025

alvaroaleman changed the title ~~✨ Fakeclient: Add apply support~~ ⚠️ : Fakeclient: Add apply support Feb 23, 2025

k8s-ci-robot added size/L Denotes a PR that changes 100-499 lines, ignoring generated files. and removed size/M Denotes a PR that changes 30-99 lines, ignoring generated files. labels Feb 23, 2025

alvaroaleman force-pushed the apply-fake branch from b8202b9 to 71e305a Compare February 23, 2025 17:57

alvaroaleman changed the title ~~⚠️ : Fakeclient: Add apply support~~ ⚠️ Fakeclient: Add apply support Feb 23, 2025

jpbetz reviewed Feb 25, 2025

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sbueringer mentioned this pull request Mar 30, 2025

Feature: Native SSA Support #3183

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sbueringer reviewed Jun 19, 2025

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k8s-ci-robot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Jun 19, 2025

alvaroaleman force-pushed the apply-fake branch from e087e01 to 5f2b677 Compare June 19, 2025 16:03

k8s-ci-robot removed the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Jun 19, 2025

alvaroaleman force-pushed the apply-fake branch 3 times, most recently from c33ac89 to 04c0089 Compare June 20, 2025 17:36

alvaroaleman force-pushed the apply-fake branch 2 times, most recently from b83e359 to 2f94e55 Compare June 26, 2025 16:54

alvaroaleman force-pushed the apply-fake branch from 2f94e55 to f4014f5 Compare June 26, 2025 16:55

k8s-ci-robot assigned sbueringer Jun 26, 2025

k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Jun 26, 2025

k8s-ci-robot merged commit cacd627 into kubernetes-sigs:main Jun 26, 2025
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sbueringer mentioned this pull request Jun 27, 2025

🌱Bump to k8s.io/* v0.34.0-alpha.2 kubernetes-sigs/controller-tools#1225

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ezeriver94 mentioned this pull request Aug 4, 2025

fake client: SSA issues: opts propagation and dryPatch bug #3267

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MarianMacik mentioned this pull request Aug 7, 2025

RHOAIENG-31497 - Monitoring namespace is not created on self-managed clusters - display error opendatahub-io/opendatahub-operator#2257

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enarha mentioned this pull request Oct 19, 2025

Investigate server-side apply to allow cooperating controllers knative/pkg#2128

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ScheererJ mentioned this pull request Oct 29, 2025

Upgrade k8s.io/* to v0.34, sigs.k8s.io/controller-runtime to v0.22 gardener/gardener#13162

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frobware mentioned this pull request Jan 5, 2026

Config follow-up: Implement Server-Side Apply bpfman/bpfman-operator#472

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alvaroaleman deleted the apply-fake branch January 18, 2026 18:57

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