controller-gen Unknown supported Kind Interface when generating crd

[szediktam]

I use kubebuilder to building api by using crds.
when I generate crd by controller-gen, with a command:
controller-gen crd
it occurs an error:
Unknown supported Kind Interface

The reason is, in my crd types, I use a interface to accept any object.
I want to generate a "object" item in crd. An example as following:
type RequestBody interface {
}
CRD define:

    body:
        description: Request body
        type: object

But the controller-gen donot support interface kind to generate crd.
A bug? Or any other way to make it.
Thanks.

[DirectXMan12]

For the moment, at least, I'd use json.RawMessage here as the underlying type. That should work fine. We decided to not support this because it's not recommended as part of the Kubernetes API conventions, but we can revisit that decision if it proves onerous.

[DirectXMan12]

alternatively, runtime.RawExtension will covert the equivalent for specifically Kubernetes-related raw JSON blobs.

[szediktam]

Thanks for your reply. @DirectXMan12
But how to use json.RawMessage or runtime.RawExtension to make it.
Can you show me an example?

[szediktam]

I use runtime.RawExtension as the type, and generated a object type in crd.
RawExtension.Raw is []byte, unmarshal it to interface to process the data.

[szediktam]

Using interface type is a direct idea for user to generate crd.
Maybe it is onerous to support interface type. @DirectXMan12

[DirectXMan12]

sorry, I'm having trouble parsing your issue with RawExtension -- it's designed for when you need to represent an arbitrary Kubernetes object.

Using interface type is a direct idea for user to generate crd.

Sorry, I'm having trouble parsing what you're trying to say here.

[szediktam]

sorry for my poor english.
I use runtime.RawExtension to solve my problem.

But, I think it is necessary to support initerface type when generate crds by controller-gen.