Add IsReachable to /pkg/kube/client to see if connected to the internet

Signed-off-by: Vibhav Bobade <vibhav.bobde@gmail.com>

pkg/kube/client.go

@@ -63,6 +63,16 @@ func New(getter genericclioptions.RESTClientGetter) *Client {
 
 var nopLogger = func(_ string, _ ...interface{}) {}
 
+// Test connectivity to the Client
+func (c *Client) IsReachable() error {
+	client, _ := c.Factory.KubernetesClientSet()
+	_, err := client.ServerVersion()
+	if err != nil {
+		return errors.New("Kubernetes cluster unreachable")
+	}
+	return nil
+}
+
 // Create creates Kubernetes resources specified in the resource list.
 func (c *Client) Create(resources ResourceList) (*Result, error) {
 	c.Log("creating %d resource(s)", len(resources))

pkg/kube/fake/printer.go

@@ -33,6 +33,11 @@ type PrintingKubeClient struct {
 	Out io.Writer
 }
 
+// isReachable checks if the cluster is reachable
+func (p *PrintingKubeClient) IsReachable() error {
+	return nil
+}
+
 // Create prints the values of what would be created with a real KubeClient.
 func (p *PrintingKubeClient) Create(resources kube.ResourceList) (*kube.Result, error) {
 	_, err := io.Copy(p.Out, bufferize(resources))

pkg/kube/interface.go

@@ -56,6 +56,9 @@ type Interface interface {
 	// WaitAndGetCompletedPodPhase waits up to a timeout until a pod enters a completed phase
 	// and returns said phase (PodSucceeded or PodFailed qualify).
 	WaitAndGetCompletedPodPhase(name string, timeout time.Duration) (v1.PodPhase, error)
+
+	// isReachable checks whether the client is able to connect to the cluster
+	IsReachable() error
 }
 
 var _ Interface = (*Client)(nil)