fix controller: use Service's TargetPort

instead of NodePort which is usually "0"
for updating RayCluster's `status.endpoints`.

follow up to ray-project#341

ray-operator/controllers/ray/raycluster_controller.go

@@ -666,34 +666,52 @@ func (r *RayClusterReconciler) updateStatus(instance *rayiov1alpha1.RayCluster)
 		}
 	}
 
+	if err := r.updateEndpoints(instance); err != nil {
+		return err
+	}
+
+	timeNow := metav1.Now()
+	instance.Status.LastUpdateTime = &timeNow
+	if err := r.Status().Update(context.Background(), instance); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (r *RayClusterReconciler) updateEndpoints(instance *rayiov1alpha1.RayCluster) error {
+	// TODO: (@scarlet25151) For now there are be several K8s Services for
+	// one RayCluster. We filter for head Services with label selectors and pick the first one.
+	// We may need use the Get method to select by name in the future.
 	rayHeadSvc := corev1.ServiceList{}
-	filterLabels = client.MatchingLabels{
+	filterLabels := client.MatchingLabels{
 		common.RayClusterLabelKey:  instance.Name,
 		common.RayNodeTypeLabelKey: "head",
 	}
-	// TODO: (@scarlet25151) for now there would be several kubernetes serivces related to
-	// one raycluster, we have used the label to select the headservice and pick the first one.
-	// we may need use Get method to select by name.
 	if err := r.List(context.TODO(), &rayHeadSvc, client.InNamespace(instance.Namespace), filterLabels); err != nil {
 		return err
 	}
+
 	if len(rayHeadSvc.Items) != 0 {
 		svc := rayHeadSvc.Items[0]
 		if instance.Status.Endpoints == nil {
 			instance.Status.Endpoints = map[string]string{}
 		}
 		for _, port := range svc.Spec.Ports {
 			if len(port.Name) == 0 {
-				r.Log.Info("updateStatus", "service port name is empty", port)
+				r.Log.Info("updateStatus", "service port's name is empty. Not adding it to RayCluster status.endpoints", port)
 				continue
 			}
-			instance.Status.Endpoints[port.Name] = fmt.Sprintf("%d", port.NodePort)
+			if port.TargetPort.IntVal != 0 {
+				instance.Status.Endpoints[port.Name] = fmt.Sprintf("%d", port.TargetPort.IntVal)
+			} else if port.TargetPort.StrVal != "" {
+				instance.Status.Endpoints[port.Name] = port.TargetPort.StrVal
+			} else {
+				r.Log.Info("updateStatus", "service port's targetPort is empty. Not adding it to RayCluster status.endpoints", port)
+			}
 		}
-	}
-	timeNow := metav1.Now()
-	instance.Status.LastUpdateTime = &timeNow
-	if err := r.Status().Update(context.Background(), instance); err != nil {
-		return err
+	} else {
+		r.Log.Info("updateEndpoints", "unable to find a Service for this RayCluster. Not adding RayCluster status.endpoints", instance.Name, "Service selectors", filterLabels)
 	}
 
 	return nil

ray-operator/controllers/ray/raycluster_controller_fake_test.go

@@ -30,6 +30,7 @@ import (
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/selection"
 	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/apimachinery/pkg/util/intstr"
 	"k8s.io/client-go/tools/record"
 	ctrl "sigs.k8s.io/controller-runtime"
 	clientFake "sigs.k8s.io/controller-runtime/pkg/client/fake"
@@ -55,6 +56,7 @@ var (
 	expectReplicaNum        int32
 	testPods                []runtime.Object
 	testRayCluster          *rayiov1alpha1.RayCluster
+	testServices            []runtime.Object
 	workerSelector          labels.Selector
 	workersToDelete         []string
 )
@@ -297,6 +299,26 @@ func setupTest(t *testing.T) {
 		},
 	}
 
+	headService, err := common.BuildServiceForHeadPod(*testRayCluster)
+	if err != nil {
+		t.Errorf("failed to build head service: %v", err)
+	}
+	// K8s automatically sets TargetPort to the same value as Port. So we mimic that behavior here.
+	for i, port := range headService.Spec.Ports {
+		headService.Spec.Ports[i].TargetPort = intstr.IntOrString{IntVal: port.Port}
+	}
+	dashboardService, err := common.BuildDashboardService(*testRayCluster)
+	if err != nil {
+		t.Errorf("failed to build dashboard service: %v", err)
+	}
+	for i, port := range dashboardService.Spec.Ports {
+		headService.Spec.Ports[i].TargetPort = intstr.IntOrString{IntVal: port.Port}
+	}
+	testServices = []runtime.Object{
+		headService,
+		dashboardService,
+	}
+
 	instanceReqValue := []string{instanceName}
 	instanceReq, err := labels.NewRequirement(
 		common.RayClusterLabelKey,
@@ -684,3 +706,28 @@ func TestReconcile_AutoscalerRoleBinding(t *testing.T) {
 
 	assert.Nil(t, err, "Fail to get autoscaler RoleBinding after reconciliation")
 }
+
+func TestUpdateEndpoints(t *testing.T) {
+	setupTest(t)
+	defer tearDown(t)
+
+	fakeClient := clientFake.NewClientBuilder().WithRuntimeObjects(testServices...).Build()
+
+	testRayClusterReconciler := &RayClusterReconciler{
+		Client:   fakeClient,
+		Recorder: &record.FakeRecorder{},
+		Scheme:   scheme.Scheme,
+		Log:      ctrl.Log.WithName("controllers").WithName("RayCluster"),
+	}
+
+	testRayClusterReconciler.updateEndpoints(testRayCluster)
+
+	expected := map[string]string{
+		"client":    "10001",
+		"dashboard": "8265",
+		"metrics":   "8080",
+		"redis":     "6379",
+		"serve":     "8000",
+	}
+	assert.Equal(t, expected, testRayCluster.Status.Endpoints, "RayCluster status endpoints not updated")
+}