Add DeletionHandlingObjectToName

Signed-off-by: Mike Spreitzer <mspreitz@us.ibm.com>

staging/src/k8s.io/client-go/tools/cache/controller.go

@@ -336,6 +336,16 @@ func DeletionHandlingMetaNamespaceKeyFunc(obj interface{}) (string, error) {
 	return MetaNamespaceKeyFunc(obj)
 }
 
+// DeletionHandlingObjectToName checks for
+// DeletedFinalStateUnknown objects before calling
+// ObjectToName.
+func DeletionHandlingObjectToName(obj interface{}) (ObjectName, error) {
+	if d, ok := obj.(DeletedFinalStateUnknown); ok {
+		return ParseObjectName(d.Key)
+	}
+	return ObjectToName(obj)
+}
+
 // NewInformer returns a Store and a controller for populating the store
 // while also providing event notifications. You should only used the returned
 // Store for Get/List operations; Add/Modify/Deletes will cause the event

staging/src/k8s.io/client-go/tools/cache/controller_test.go

@@ -574,3 +574,31 @@ func TestTransformingInformer(t *testing.T) {
 
 	close(stopCh)
 }
+
+func TestDeletionHandlingObjectToName(t *testing.T) {
+	cm := &v1.ConfigMap{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      "testname",
+			Namespace: "testnamespace",
+		},
+	}
+	stringKey, err := MetaNamespaceKeyFunc(cm)
+	if err != nil {
+		t.Error(err)
+	}
+	deleted := DeletedFinalStateUnknown{
+		Key: stringKey,
+		Obj: cm,
+	}
+	expected, err := ObjectToName(cm)
+	if err != nil {
+		t.Error(err)
+	}
+	actual, err := DeletionHandlingObjectToName(deleted)
+	if err != nil {
+		t.Error(err)
+	}
+	if expected != actual {
+		t.Errorf("Expected %#v, got %#v", expected, actual)
+	}
+}