Allow for headless envoy services

internal/gatewayapi/status/gateway.go

@@ -58,7 +58,12 @@ func UpdateGatewayStatusProgrammedCondition(gw *gwapiv1.Gateway, svc *corev1.Ser
 			if len(svc.Spec.ExternalIPs) > 0 {
 				addresses = append(addresses, svc.Spec.ExternalIPs...)
 			} else if len(svc.Spec.ClusterIPs) > 0 {
-				addresses = append(addresses, svc.Spec.ClusterIPs...)
+				// Filter out "None" values which represent headless services
+				for _, ip := range svc.Spec.ClusterIPs {
+					if ip != "" && ip != "None" {
+						addresses = append(addresses, ip)
+					}
+				}
 			}
 		} else {
 			if svc.Spec.Type == corev1.ServiceTypeLoadBalancer {

internal/gatewayapi/status/gateway_test.go

@@ -242,6 +242,21 @@ func TestUpdateGatewayStatusProgrammedCondition(t *testing.T) {
 				},
 			},
 		},
+		{
+			name: "Headless ClusterIP svc with None",
+			args: args{
+				gw: &gwapiv1.Gateway{},
+				svc: &corev1.Service{
+					TypeMeta:   metav1.TypeMeta{},
+					ObjectMeta: metav1.ObjectMeta{},
+					Spec: corev1.ServiceSpec{
+						ClusterIPs: []string{"None"},
+						Type:       corev1.ServiceTypeClusterIP,
+					},
+				},
+			},
+			wantAddresses: nil,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {