util: moved GetNodeLabels() under internal/util/k8s

Signed-off-by: Praveen M <m.praveen@ibm.com>

internal/util/k8s/client.go

@@ -25,8 +25,14 @@ import (
 	"k8s.io/client-go/tools/clientcmd"
 )
 
+var kubeclient *kubernetes.Clientset
+
 // NewK8sClient create kubernetes client.
 func NewK8sClient() (*kubernetes.Clientset, error) {
+	if kubeclient != nil {
+		return kubeclient, nil
+	}
+
 	var cfg *rest.Config
 	var err error
 	cPath := os.Getenv("KUBERNETES_CONFIG_PATH")
@@ -46,5 +52,7 @@ func NewK8sClient() (*kubernetes.Clientset, error) {
 		return nil, fmt.Errorf("failed to create client: %w", err)
 	}
 
+	kubeclient = client
+
 	return client, nil
 }

internal/util/k8s/node.go

@@ -0,0 +1,39 @@
+/*
+Copyright 2023 The CephCSI Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package k8s
+
+import (
+	"context"
+	"fmt"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+func GetNodeLabels(nodeName string) (map[string]string, error) {
+	client, err := NewK8sClient()
+	if err != nil {
+		return nil, fmt.Errorf("can not get node %q information, failed "+
+			"to connect to Kubernetes: %w", nodeName, err)
+	}
+
+	node, err := client.CoreV1().Nodes().Get(context.TODO(), nodeName, metav1.GetOptions{})
+	if err != nil {
+		return nil, fmt.Errorf("failed to get node %q information: %w", nodeName, err)
+	}
+
+	return node.GetLabels(), nil
+}