proxy/ipvs: add a unit tests for when the ProxyTerminatingEndpoint feature gate is disabled

Signed-off-by: Andrew Sy Kim <kim.andrewsy@gmail.com>

pkg/proxy/ipvs/proxier_test.go

@@ -4795,9 +4795,8 @@ func Test_EndpointSliceReadyAndTerminatingLocal(t *testing.T) {
 	// externalIP should route to local ready + non-terminating endpoints if they exist
 	realServers2, rsErr2 := ipvs.GetRealServers(externalIPServer)
 	assert.Nil(t, rsErr2, "Expected no error getting real servers")
-	assert.Len(t, realServers2, 2, "Expected 2 real servers")
-	assert.Equal(t, realServers2[0].String(), "10.0.1.1:80")
-	assert.Equal(t, realServers2[1].String(), "10.0.1.2:80")
+	assert.Len(t, realServers2, 1, "Expected 1 real servers")
+	assert.Equal(t, realServers2[0].String(), "10.0.1.3:80")
 
 	fp.OnEndpointSliceDelete(endpointSlice)
 	fp.syncProxyRules()
@@ -5002,3 +5001,174 @@ func Test_EndpointSliceOnlyReadyAndTerminatingLocal(t *testing.T) {
 	assert.Nil(t, rsErr2, "Expected no error getting real servers")
 	assert.Len(t, realServers2, 0, "Expected 0 real servers")
 }
+
+// Test_EndpointSliceOnlyReadyTerminatingLocalWithFeatureGateDisabled tests that when there are only local ready terminating
+// endpoints, we fall back to those endpoints.
+func Test_EndpointSliceOnlyReadyAndTerminatingLocalWithFeatureGateDisabled(t *testing.T) {
+	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.ProxyTerminatingEndpoints, false)()
+
+	ipt := iptablestest.NewFake()
+	ipvs := ipvstest.NewFake()
+	ipset := ipsettest.NewFake(testIPSetVersion)
+	fp := NewFakeProxier(ipt, ipvs, ipset, nil, nil, true, v1.IPv4Protocol)
+	fp.servicesSynced = true
+	fp.endpointsSynced = true
+	fp.endpointSlicesSynced = true
+
+	localInternalTrafficPolicy := v1.ServiceInternalTrafficPolicyLocal
+
+	// Add initial service
+	serviceName := "svc1"
+	namespaceName := "ns1"
+	fp.OnServiceAdd(&v1.Service{
+		ObjectMeta: metav1.ObjectMeta{Name: serviceName, Namespace: namespaceName},
+		Spec: v1.ServiceSpec{
+			ClusterIP:             "172.20.1.1",
+			Selector:              map[string]string{"foo": "bar"},
+			Type:                  v1.ServiceTypeNodePort,
+			ExternalTrafficPolicy: v1.ServiceExternalTrafficPolicyTypeLocal,
+			InternalTrafficPolicy: &localInternalTrafficPolicy,
+			ExternalIPs: []string{
+				"1.2.3.4",
+			},
+			Ports: []v1.ServicePort{
+				{
+					Name:       "",
+					Port:       80,
+					TargetPort: intstr.FromInt(80),
+					Protocol:   v1.ProtocolTCP,
+				},
+			},
+		},
+	})
+
+	// Add initial endpoint slice
+	tcpProtocol := v1.ProtocolTCP
+	endpointSlice := &discovery.EndpointSlice{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      fmt.Sprintf("%s-1", serviceName),
+			Namespace: namespaceName,
+			Labels:    map[string]string{discovery.LabelServiceName: serviceName},
+		},
+		Ports: []discovery.EndpointPort{{
+			Name:     utilpointer.StringPtr(""),
+			Port:     utilpointer.Int32Ptr(80),
+			Protocol: &tcpProtocol,
+		}},
+		AddressType: discovery.AddressTypeIPv4,
+		Endpoints: []discovery.Endpoint{
+			{
+				Addresses: []string{"10.0.1.1"},
+				Conditions: discovery.EndpointConditions{
+					Ready:       utilpointer.BoolPtr(false),
+					Serving:     utilpointer.BoolPtr(true),
+					Terminating: utilpointer.BoolPtr(true),
+				},
+				Topology: map[string]string{"kubernetes.io/hostname": testHostname},
+			},
+			{
+				Addresses: []string{"10.0.1.2"},
+				Conditions: discovery.EndpointConditions{
+					Ready:       utilpointer.BoolPtr(false),
+					Serving:     utilpointer.BoolPtr(true),
+					Terminating: utilpointer.BoolPtr(true),
+				},
+				Topology: map[string]string{"kubernetes.io/hostname": testHostname},
+			},
+			{
+				Addresses: []string{"10.0.1.3"},
+				Conditions: discovery.EndpointConditions{
+					Ready:       utilpointer.BoolPtr(false),
+					Serving:     utilpointer.BoolPtr(false),
+					Terminating: utilpointer.BoolPtr(true),
+				},
+				Topology: map[string]string{"kubernetes.io/hostname": testHostname},
+			},
+			{
+				Addresses: []string{"10.0.1.4"},
+				Conditions: discovery.EndpointConditions{
+					Ready:       utilpointer.BoolPtr(false),
+					Serving:     utilpointer.BoolPtr(true),
+					Terminating: utilpointer.BoolPtr(true),
+				},
+				Topology: map[string]string{"kubernetes.io/hostname": "another-host"},
+			},
+			{
+				Addresses: []string{"10.0.1.5"},
+				Conditions: discovery.EndpointConditions{
+					Ready:       utilpointer.BoolPtr(true),
+					Serving:     utilpointer.BoolPtr(true),
+					Terminating: utilpointer.BoolPtr(false),
+				},
+				Topology: map[string]string{"kubernetes.io/hostname": "another-host"},
+			},
+		},
+	}
+
+	fp.OnEndpointSliceAdd(endpointSlice)
+	fp.syncProxyRules()
+
+	// Ensure that Proxier updates ipvs appropriately after EndpointSlice update
+	assert.NotNil(t, fp.ipsetList["KUBE-LOOP-BACK"])
+	activeEntries1 := fp.ipsetList["KUBE-LOOP-BACK"].activeEntries
+	assert.Equal(t, 3, activeEntries1.Len(), "Expected 3 active entry in KUBE-LOOP-BACK")
+	assert.Equal(t, true, activeEntries1.Has("10.0.1.1,tcp:80,10.0.1.1"), "Expected activeEntries to reference first (local) pod")
+	assert.Equal(t, true, activeEntries1.Has("10.0.1.2,tcp:80,10.0.1.2"), "Expected activeEntries to reference second (local) pod")
+	assert.Equal(t, true, activeEntries1.Has("10.0.1.3,tcp:80,10.0.1.3"), "Expected activeEntries to reference second (local) pod")
+
+	virtualServers, vsErr := ipvs.GetVirtualServers()
+	assert.Nil(t, vsErr, "Expected no error getting virtual servers")
+	assert.Len(t, virtualServers, 2, "Expected 2 virtual server")
+
+	var clusterIPServer, externalIPServer *utilipvs.VirtualServer
+	for _, virtualServer := range virtualServers {
+		if virtualServer.Address.String() == "172.20.1.1" {
+			clusterIPServer = virtualServer
+		}
+
+		if virtualServer.Address.String() == "1.2.3.4" {
+			externalIPServer = virtualServer
+		}
+	}
+
+	// clusterIP should route to cluster-wide Ready endpoints
+	realServers1, rsErr1 := ipvs.GetRealServers(clusterIPServer)
+	assert.Nil(t, rsErr1, "Expected no error getting real servers")
+	assert.Len(t, realServers1, 1, "Expected 1 real servers")
+	assert.Equal(t, realServers1[0].String(), "10.0.1.5:80")
+
+	// externalIP should have 0 endpoints since the feature gate is disabled.
+	realServers2, rsErr2 := ipvs.GetRealServers(externalIPServer)
+	assert.Nil(t, rsErr2, "Expected no error getting real servers")
+	assert.Len(t, realServers2, 0, "Expected 0 real servers")
+
+	fp.OnEndpointSliceDelete(endpointSlice)
+	fp.syncProxyRules()
+
+	// Ensure that Proxier updates ipvs appropriately after EndpointSlice delete
+	assert.NotNil(t, fp.ipsetList["KUBE-LOOP-BACK"])
+	activeEntries2 := fp.ipsetList["KUBE-LOOP-BACK"].activeEntries
+	assert.Equal(t, 0, activeEntries2.Len(), "Expected 0 active entries in KUBE-LOOP-BACK")
+
+	virtualServers, vsErr = ipvs.GetVirtualServers()
+	assert.Nil(t, vsErr, "Expected no error getting virtual servers")
+	assert.Len(t, virtualServers, 2, "Expected 1 virtual server")
+
+	for _, virtualServer := range virtualServers {
+		if virtualServer.Address.String() == "172.20.1.1" {
+			clusterIPServer = virtualServer
+		}
+
+		if virtualServer.Address.String() == "1.2.3.4" {
+			externalIPServer = virtualServer
+		}
+	}
+
+	realServers1, rsErr1 = ipvs.GetRealServers(clusterIPServer)
+	assert.Nil(t, rsErr1, "Expected no error getting real servers")
+	assert.Len(t, realServers1, 0, "Expected 0 real servers")
+
+	realServers2, rsErr2 = ipvs.GetRealServers(externalIPServer)
+	assert.Nil(t, rsErr2, "Expected no error getting real servers")
+	assert.Len(t, realServers2, 0, "Expected 0 real servers")
+}