[svc] return error if no LoadBalancer IP

If there is an issue with the LoadBalancer service in the cluster,
like the MetalLB instance is down, or the requested IP using the
metallb.universe.tf/loadBalancerIPs annotation is outside the
configured range of the IPAddressPool, the k8s LoadBalancert service
External-IP is stuck in pending. This would not allow dataplane
service to connect to the service.
This change returns an error in this case to reflect that there is
an issue with the k8s service, which needs to be fixed and the consumer
of the func can reconcile to wait for a LoadBalancer IP to be available.

Signed-off-by: Martin Schuppert <mschuppert@redhat.com>

modules/common/service/service.go

@@ -338,6 +338,8 @@ func (s *Service) CreateOrPatch(
 			for _, ingr := range service.Status.LoadBalancer.Ingress {
 				s.externalIPs = append(s.externalIPs, ingr.IP)
 			}
+		} else {
+			return ctrl.Result{}, fmt.Errorf("%s LoadBalancer IP still pending", s.service.Name)
 		}
 	}
 

modules/common/test/functional/service_test.go

@@ -221,10 +221,26 @@ var _ = Describe("service package", func() {
 		Expect(err).ShouldNot(HaveOccurred())
 
 		_, err = s.CreateOrPatch(ctx, h)
-		Expect(err).ShouldNot(HaveOccurred())
+		// when LoadBalancer service gets created and LB has not assigned an LB IP we exect an error
+		Expect(err).Should(HaveOccurred())
+		Expect(err.Error()).Should(ContainSubstring("test-svc LoadBalancer IP still pending"))
+
 		svc := th.AssertServiceExists(types.NamespacedName{Namespace: namespace, Name: "test-svc"})
 		Expect(svc.Spec.Type).To(Equal(corev1.ServiceTypeLoadBalancer))
 
+		// simulate LoadBalancer assigned IP and updated the k8s service to have a LB IP
+		svc.Status.LoadBalancer.Ingress = []corev1.LoadBalancerIngress{
+			{
+				IP: "1.1.1.1",
+			},
+		}
+		Expect(th.K8sClient.Status().Update(ctx, svc)).Should(Succeed())
+
+		// LoadBalancer IP still pending error should _NOT_ occure
+		_, err = s.CreateOrPatch(ctx, h)
+		Expect(err).ShouldNot(HaveOccurred())
+		Expect(s.GetExternalIPs()).To(Equal([]string{"1.1.1.1"}))
+
 		// NONE endpoint with port
 		endpointURL, err := s.GetAPIEndpoint(nil, ptr.To(service.ProtocolNone), "")
 		Expect(err).ShouldNot(HaveOccurred())