From 369117e5ef687d56117ef701aa29558c4f7e7eb9 Mon Sep 17 00:00:00 2001
From: Jordan Liggitt <jliggitt@redhat.com>
Date: Fri, 12 May 2017 13:01:54 -0400
Subject: [PATCH] UPSTREAM: 50583: Make endpoints controller update based on
 semantic equality

---
 .../endpoint/endpoints_controller.go          |  9 ++-
 .../endpoint/endpoints_controller_test.go     | 64 +++++++++++++++++++
 2 files changed, 70 insertions(+), 3 deletions(-)

diff --git a/vendor/k8s.io/kubernetes/pkg/controller/endpoint/endpoints_controller.go b/vendor/k8s.io/kubernetes/pkg/controller/endpoint/endpoints_controller.go
index 446dd90ffb70..a4d1ecf146d1 100644
--- a/vendor/k8s.io/kubernetes/pkg/controller/endpoint/endpoints_controller.go
+++ b/vendor/k8s.io/kubernetes/pkg/controller/endpoint/endpoints_controller.go
@@ -22,6 +22,7 @@ import (
 	"strconv"
 	"time"
 
+	apiequality "k8s.io/apimachinery/pkg/api/equality"
 	"k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
@@ -498,8 +499,11 @@ func (e *EndpointController) syncService(key string) error {
 		}
 	}
 
-	if reflect.DeepEqual(currentEndpoints.Subsets, subsets) &&
-		reflect.DeepEqual(currentEndpoints.Labels, service.Labels) {
+	createEndpoints := len(currentEndpoints.ResourceVersion) == 0
+
+	if !createEndpoints &&
+		apiequality.Semantic.DeepEqual(currentEndpoints.Subsets, subsets) &&
+		apiequality.Semantic.DeepEqual(currentEndpoints.Labels, service.Labels) {
 		glog.V(5).Infof("endpoints are equal for %s/%s, skipping update", service.Namespace, service.Name)
 		return nil
 	}
@@ -515,7 +519,6 @@ func (e *EndpointController) syncService(key string) error {
 	}
 
 	glog.V(4).Infof("Update endpoints for %v/%v, ready: %d not ready: %d", service.Namespace, service.Name, readyEps, notReadyEps)
-	createEndpoints := len(currentEndpoints.ResourceVersion) == 0
 	if createEndpoints {
 		// No previous endpoints, create them
 		_, err = e.client.Core().Endpoints(service.Namespace).Create(newEndpoints)
diff --git a/vendor/k8s.io/kubernetes/pkg/controller/endpoint/endpoints_controller_test.go b/vendor/k8s.io/kubernetes/pkg/controller/endpoint/endpoints_controller_test.go
index a4f83a596c77..dda86d8a267b 100644
--- a/vendor/k8s.io/kubernetes/pkg/controller/endpoint/endpoints_controller_test.go
+++ b/vendor/k8s.io/kubernetes/pkg/controller/endpoint/endpoints_controller_test.go
@@ -144,6 +144,70 @@ func TestSyncEndpointsItemsPreserveNoSelector(t *testing.T) {
 	endpointsHandler.ValidateRequestCount(t, 0)
 }
 
+func TestSyncEndpointsExistingNilSubsets(t *testing.T) {
+	ns := metav1.NamespaceDefault
+	testServer, endpointsHandler := makeTestServer(t, ns)
+	defer testServer.Close()
+	endpoints := newController(testServer.URL)
+	endpoints.endpointsStore.Add(&v1.Endpoints{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:            "foo",
+			Namespace:       ns,
+			ResourceVersion: "1",
+		},
+		Subsets: nil,
+	})
+	endpoints.serviceStore.Add(&v1.Service{
+		ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: ns},
+		Spec: v1.ServiceSpec{
+			Selector: map[string]string{"foo": "bar"},
+			Ports:    []v1.ServicePort{{Port: 80}},
+		},
+	})
+	endpoints.syncService(ns + "/foo")
+	endpointsHandler.ValidateRequestCount(t, 0)
+}
+
+func TestSyncEndpointsExistingEmptySubsets(t *testing.T) {
+	ns := metav1.NamespaceDefault
+	testServer, endpointsHandler := makeTestServer(t, ns)
+	defer testServer.Close()
+	endpoints := newController(testServer.URL)
+	endpoints.endpointsStore.Add(&v1.Endpoints{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:            "foo",
+			Namespace:       ns,
+			ResourceVersion: "1",
+		},
+		Subsets: []v1.EndpointSubset{},
+	})
+	endpoints.serviceStore.Add(&v1.Service{
+		ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: ns},
+		Spec: v1.ServiceSpec{
+			Selector: map[string]string{"foo": "bar"},
+			Ports:    []v1.ServicePort{{Port: 80}},
+		},
+	})
+	endpoints.syncService(ns + "/foo")
+	endpointsHandler.ValidateRequestCount(t, 0)
+}
+
+func TestSyncEndpointsNewNoSubsets(t *testing.T) {
+	ns := metav1.NamespaceDefault
+	testServer, endpointsHandler := makeTestServer(t, ns)
+	defer testServer.Close()
+	endpoints := newController(testServer.URL)
+	endpoints.serviceStore.Add(&v1.Service{
+		ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: ns},
+		Spec: v1.ServiceSpec{
+			Selector: map[string]string{"foo": "bar"},
+			Ports:    []v1.ServicePort{{Port: 80}},
+		},
+	})
+	endpoints.syncService(ns + "/foo")
+	endpointsHandler.ValidateRequestCount(t, 1)
+}
+
 func TestCheckLeftoverEndpoints(t *testing.T) {
 	ns := metav1.NamespaceDefault
 	testServer, _ := makeTestServer(t, ns)