Support TCP type runtime endpoint for kubelet.

pkg/kubelet/util/util.go

@@ -17,6 +17,9 @@ limitations under the License.
 package util
 
 import (
+	"fmt"
+	"net/url"
+
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
@@ -25,3 +28,18 @@ import (
 func FromApiserverCache(opts *metav1.GetOptions) {
 	opts.ResourceVersion = "0"
 }
+
+func parseEndpoint(endpoint string) (string, string, error) {
+	u, err := url.Parse(endpoint)
+	if err != nil {
+		return "", "", err
+	}
+
+	if u.Scheme == "tcp" {
+		return "tcp", u.Host, nil
+	} else if u.Scheme == "unix" {
+		return "unix", u.Path, nil
+	} else {
+		return "", "", fmt.Errorf("protocol %q not supported", u.Scheme)
+	}
+}