Create a strimzi CustomResource in a Golang - operator-sdk based operator

[DanArlowski]

when creating a Golang based operator, to use an external custom resources you add

import (
pkgname "github.com/some/package/api/v1
)

...

utilruntime.Must(pkgname.AddToScheme(scheme))

I was wondering how to create a strimzi Cr using my operator, as the operator is not written natively in go, so the API package does not exist in go.

[ppatierno]

We currently support the API in Java of course that helps but not in Go.
I think the only way you have is kind of writing the api package by yourself. I mean, you have to write the corresponding Go structs mapping the Strimzi related custom resource. The simpler way would be having a tool converting the provided CRDs (YAML) into Go structs but I am not aware of such a tool.

[DanArlowski]

suggest supporting it officially as the api may can (and probably will) change,

as such - this can help most go-based k8s operators and apps.

nonetheless - thanks for you help and quick answer.

[scholzj]

The simpler way would be having a tool converting the provided CRDs (YAML) into Go structs but I am not aware of such a tool.

I know Pulumi has a tool which is quite similar to this, but I think it generates the Golang structures for some Pulumi client and not the Kubernetes client: https://www.pulumi.com/blog/introducing-crd2pulumi/ ... not sure how easy it would be to change these or use them with the Kubernetes client.

suggest supporting it officially as the api may can (and probably will) change,

The CRD generator (https://github.com/strimzi/strimzi-kafka-operator/tree/main/crd-generator) currently generates the docs and the CRD YAMLs. It would need to be extended to generate the Golang files. Contributions are always welcomed ;-).

---

Other option should IMHO be to use the dynamic Kubernetes client -> basically just use map[string]interface{} structures as described here: https://github.com/kubernetes/client-go/blob/master/examples/dynamic-create-update-delete-deployment/main.go ... then you should not need any generated types

[tusharm]

Hi! Just checking if things have changed since last comment 😄 . I have come across a similar usecase and would like to know if client-go dynamic pkg is still the way to go.

[scholzj]

No, I don't think anything changed since last time.

[scholzj]

FYI: I put together a generator for Golang APIs and Kubernetes clients: https://github.com/scholzj/strimzi-go ... if anyone is still interested in this, please check it out and let me know if you have any feedback and/or are interested in using it.