Client-go: object return by client-go informer don't have api Kind info

[wangweihong]

When I use informer to watch cluster resource infos, I find runtime.Object return by informer don't include object Kind info.
fmt.Println(obj.GetObjectKind().GetVersionKind().String())print /, Kind=

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[krmayankk]

/remove-lifecycle stale

[krmayankk]

@smarterclayton i am also seeing this issue. If you know how to fix it ,i would like to take a stab at it

[krmayankk]

/assign @krmayankk

[thomastaylor312]

I don't think the Kind is returned either with List

[bostrt]

The k8s REST API does not provide the Kind value. kubectl (or one of its dependencies) inserts the Kind information. Perhaps the code that figures the Kind info can be moved to client-go? Just for example, see get cmd and how it inserts the List value.

[nikhita]

This occurs because the gvk is cleared during decoding: https://github.com/kubernetes/kubernetes/blob/master/staging/src/k8s.io/apimachinery/pkg/runtime/serializer/versioning/versioning.go#L256.

This is intentional. See https://github.com/kubernetes/kubernetes/pull/59264#issuecomment-362575608 for more details.

[nikhita]

Reported in kubernetes/kubernetes#3030

Fix in progress in kubernetes/kubernetes#63972

[thomastaylor312]

Thank you for the update @nikhita!

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[k8s-ci-robot]

@fejta-bot: Closing this issue.

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[aermakov-zalando]

/reopen

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[hjkatz]

For those of us still looking for a concise way to add TypeMeta information to runtime objects, here you go!

// addTypeInformationToObject adds TypeMeta information to a runtime.Object based upon the loaded scheme.Scheme
// inspired by: https://github.com/kubernetes/cli-runtime/blob/v0.19.2/pkg/printers/typesetter.go#L41
func addTypeInformationToObject(obj runtime.Object) error {
    gvks, _, err := scheme.Scheme.ObjectKinds(obj)
    if err != nil {
        return fmt.Errorf("missing apiVersion or kind and cannot assign it; %w", err)
    }

    for _, gvk := range gvks {
        if len(gvk.Kind) == 0 {
            continue
        }
        if len(gvk.Version) == 0 || gvk.Version == runtime.APIVersionInternal {
            continue
        }
        obj.GetObjectKind().SetGroupVersionKind(gvk)
        break
    }

    return nil
}