How to Create and Retrieve Custom Kubernetes Resources using RESTClient?

Create/Get a Custom Kubernetes Resource

For creating and retrieving custom Kubernetes resources, you need to use the RESTClient and specify the custom resource's API path and version.

Creating a Custom Resource

To create a custom resource, such as a KongPlugin, you can use the following code:

<code class="go">import "k8s.io/client-go/rest"

func CreateCustomResource() error {
    // Construct the full path to the custom resource
    absPath := "/apis/configuration.konghq.com/v1/namespaces/default/kongplugins"

    // Marshal the custom resource data into a byte array
    body, err := json.Marshal(customResource)
    if err != nil {
        return err
    }

    // Create a RESTClient using in-cluster configuration
    confs, err := rest.InClusterConfig()
    if err != nil {
        return err
    }
    client, err := rest.RESTClientFor(confs)
    if err != nil {
        return err
    }

    // Make a POST request to create the custom resource
    _, err = client.Post().AbsPath(absPath).Body(body).DoRaw()
    if err != nil {
        return err
    }

    return nil
}</code>

Getting a Custom Resource

To retrieve a custom resource, you can use the following code:

<code class="go">import "k8s.io/client-go/rest"

func GetCustomResource() (*CustomResource, error) {
    // Construct the full path to the custom resource
    absPath := "/apis/configuration.konghq.com/v1/namespaces/default/kongplugins/kongplugin-sample"

    // Create a RESTClient using in-cluster configuration
    confs, err := rest.InClusterConfig()
    if err != nil {
        return nil, err
    }
    client, err := rest.RESTClientFor(confs)
    if err != nil {
        return nil, err
    }

    // Make a GET request to retrieve the custom resource
    data, err := client.Get().AbsPath(absPath).DoRaw()
    if err != nil {
        return nil, err
    }

    // Unmarshal the JSON response into the custom resource object
    customResource := &CustomResource{}
    if err := json.Unmarshal(data, customResource); err != nil {
        return nil, err
    }

    return customResource, nil
}</code>

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