How to Create and Retrieve Custom Kubernetes Resources using the Go Client Library?

Creating and Retrieving Custom Kubernetes Resources in Go

In Kubernetes, you can define and manage custom resources, which extend the capabilities of the platform. Creating and getting custom resources can be done programmatically using the Go client library.

Creating a Custom Resource

To create a custom resource such as the KongPlugin, you'll need to use the RESTClient of the Kubernetes clientset. Here's how:

<code class="go">// Create a KongPlugin custom resource.
kongPlugin := &KongPlugin{
    TypeMeta: metav1.TypeMeta{
        APIVersion: "configuration.konghq.com/v1",
        Kind:       "KongPlugin",
    },
    ObjectMeta: metav1.ObjectMeta{
        Name: "add-response-header",
    },
    Config: KongPluginConfig{
        Add: KongPluginConfigAdd{
            Headers: []string{"demo: injected-by-kong"},
        },
    },
    Plugin: "response-transformer",
}

body, err := json.Marshal(kongPlugin)
if err != nil {
    panic(err)
}

data, err := clientset.RESTClient().
    Post().
    AbsPath("/apis/configuration.konghq.com/v1/namespaces/" + namespace + "/kongplugins").
    Body(body).
    DoRaw(context.TODO())</code>

Retrieving a Custom Resource

To retrieve a custom resource, you can use the Get() method of the RESTClient:

<code class="go">// Get the KongPlugin custom resource.
data, err := clientset.RESTClient().
    Get().
    AbsPath("/apis/configuration.konghq.com/v1/namespaces/" + namespace + "/kongplugins/add-response-header").
    DoRaw(context.TODO())</code>

AbsPath() Notes:

• The AbsPath() method takes the full absolute path to the Kubernetes resource.
• To find the resource's absolute path, use kubectl get -o=jsonpath='{$.metadata.selfLink}'.
• Alternatively, you can specify the path manually by including the API group, version, namespace, and resource type.

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