How to query a CR for a given namespace using client-go RESTClient() function

Question

This golang code works well:

    topics := &kafka.KafkaTopicList{}
    d, err := clientSet.RESTClient().Get().AbsPath("/apis/kafka.strimzi.io/v1beta2/kafkatopics").DoRaw(context.TODO())
    if err != nil {
        panic(err.Error())
    }

However I'd like to get the kafkatopics custom resources only for a given namespace, is there a way to do this using client-go api? For information, using clientSet.RESTClient().Get().Namespace("<my-namespace>") returns the following error message: "the server could not find the requested resource"

Answer 1

Try:

group := "kafka.strimzi.io"
version := "v1beta2"
plural := "kafkatopics"

namespace := "..."

d, err := clientSet.RESTClient().Get().AbsPath(
    fmt.Sprintf("/apis/%s/%s/namespaces/%s/%s",
        group,
        version,
        namespace,
        plural,
    ).DoRaw(context.TODO())
if err != nil {
    panic(err.Error())
}

I think using CRDs, client-go's Namespace method incorrectly appends namespace/{namespace} into the request URL with CRDs.

You want:

/apis/{group}/{version}/namespaces/{namespace}/{plural}

Using Namespace, you get:

/apis/{group}/{version}/{plural}/namespaces/{namespace}

You can prove this to yourself with:

log.Println(restClient.Get().Namespace(namespace).AbsPath(
    fmt.Sprintf("/apis/%s/%s/%s",
        group,
        version,
        plural,
    ),
).URL().String())