add k8s client

pkg/client/k8sclient.go

@@ -15,3 +15,56 @@ limitations under the License.
 */
 
 package client
+
+
+import (
+	"kubesphere.io/kubesphere/pkg/options"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/clientcmd"
+	"github.com/golang/glog"
+)
+
+var k8sClient *kubernetes.Clientset
+
+func getKubeConfig() (kubeConfig *rest.Config, err error) {
+
+	kubeConfigFile := options.ServerOptions.GetKubeConfigFile()
+
+	if len(kubeConfigFile) > 0 {
+
+		kubeConfig, err = clientcmd.BuildConfigFromFlags("", kubeConfigFile)
+		if err != nil {
+			return nil, err
+		}
+
+	} else {
+
+		kubeConfig, err = rest.InClusterConfig()
+		if err != nil{
+			return nil, err
+		}
+	}
+
+	return kubeConfig, nil
+
+}
+
+func NewK8sClient() *kubernetes.Clientset {
+	if k8sClient != nil {
+		return k8sClient
+	}
+
+	kubeConfig, err := getKubeConfig()
+	if err != nil {
+		glog.Error(err)
+		panic(err)
+	}
+
+	k8sClient, err = kubernetes.NewForConfig(kubeConfig)
+	if err != nil{
+		glog.Error(err)
+		panic(err)
+	}
+	return k8sClient
+}