API Machinery unstructured package

get-resources-dynamic.go

import (
	"context"
	"fmt"

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
	"k8s.io/apimachinery/pkg/runtime/schema"
	"k8s.io/client-go/dynamic"
	ctrl "sigs.k8s.io/controller-runtime"
)

func main() {
	ctx := context.Background()
	config := ctrl.GetConfigOrDie()
	dynamic := dynamic.NewForConfigOrDie(config)

	namespace := "default"
	items, err := GetResourcesDynamically(dynamic, ctx,
	      "apps", "v1", "deployments", namespace)
	if err != nil {
		fmt.Println(err)
	} else {
		for _, item := range items {
			fmt.Printf("%+v\n", item)
		}
	}
}

func GetResourcesDynamically(dynamic dynamic.Interface, ctx context.Context,
	group string, version string, resource string, namespace string) (
	[]unstructured.Unstructured, error) {

	resourceId := schema.GroupVersionResource{
		Group:    group,
		Version:  version,
		Resource: resource,
	}
	list, err := dynamic.Resource(resourceId).Namespace(namespace).
		List(ctx, metav1.ListOptions{})

	if err != nil {
		return nil, err
	}

	return list.Items, nil
}