⚠️ Fakeclient: Add apply support #2981

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.

Fixes #2341

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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.

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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.

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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

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

@@ -119,6 +123,7 @@ type ClientBuilder struct {
 	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?

jpbetz · 2025-02-25T16:31:50Z

pkg/client/fake/client.go

@@ -160,6 +165,8 @@ func (f *ClientBuilder) WithRuntimeObjects(initRuntimeObjs ...runtime.Object) *C
 }

 // WithObjectTracker can be optionally used to initialize this fake client with testing.ObjectTracker.
+// Setting this is incompatible with setting WithTypeConverters, as they are a setting on the


Enforce this in code with an assertion?

jpbetz · 2025-02-25T16:31:56Z

pkg/client/fake/client.go

@@ -216,6 +223,18 @@ func (f *ClientBuilder) WithInterceptorFuncs(interceptorFuncs interceptor.Funcs)
 	return f
 }

+// WithTypeConverters sets the type converters for the fake client. The list is ordered and the first
+// non-erroring converter is used.
+// This setting is incompatible with WithObjectTracker, as the type converters are a setting on the tracker.


Enforce this in code with an assertion?

jpbetz

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

k8s-ci-robot · 2025-03-08T03:40:01Z

PR needs rebase.

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/lifecycle rotten

tomasaschan · 2025-04-11T05:43:24Z

@alvaroaleman I ran into this myself but was able to verify that this PR solves it well enough for my own needs at least.

Is there anything I can do to help land this in a release?

alvaroaleman · 2025-04-11T21:46:45Z

@tomasaschan this can not be merged in its current form, we need support in the upstream tracker for reloading the scheme and find a way to avoid breaking everyone by adding the managed fields.

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

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

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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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tomasaschan mentioned this pull request Apr 10, 2025

Support server-side apply (client.Apply) in fake Client #2341

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tomasaschan added a commit to tomasaschan/controller-runtime that referenced this pull request Apr 11, 2025

Address review feedback from kubernetes-sigs#2981

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tomasaschan mentioned this pull request Apr 11, 2025

⚠️ Fakeclient: Add apply support (take 2) #3196

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⚠️ Fakeclient: Add apply support #2981

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