Reduce cyclomatic complexity in controller.go (#6373)

reduce cyclomatic complexity

internal/k8s/controller.go

@@ -3015,6 +3015,19 @@ func findPoliciesForSecret(policies []*conf_v1.Policy, secretNamespace string, s
 	return res
 }
 
+func (lbc *LoadBalancerController) getTransportServerBackupEndpointsAndKey(transportServer *conf_v1.TransportServer, u conf_v1.TransportServerUpstream, externalNameSvcs map[string]bool) ([]string, string) {
+	backupEndpointsKey := configs.GenerateEndpointsKey(transportServer.Namespace, u.Backup, nil, *u.BackupPort)
+	backupEndps, external, err := lbc.getEndpointsForUpstream(transportServer.Namespace, u.Backup, *u.BackupPort)
+	if err != nil {
+		glog.Warningf("Error getting Endpoints for Upstream %v: %v", u.Name, err)
+	}
+	if err == nil && external {
+		externalNameSvcs[configs.GenerateExternalNameSvcKey(transportServer.Namespace, u.Backup)] = true
+	}
+	bendps := getIPAddressesFromEndpoints(backupEndps)
+	return bendps, backupEndpointsKey
+}
+
 func (lbc *LoadBalancerController) createTransportServerEx(transportServer *conf_v1.TransportServer, listenerPort int) *configs.TransportServerEx {
 	endpoints := make(map[string][]string)
 	externalNameSvcs := make(map[string]bool)
@@ -3042,17 +3055,8 @@ func (lbc *LoadBalancerController) createTransportServerEx(transportServer *conf
 			}
 		}
 
-		// If backup defined on Upstream retrieve its external name and port.
 		if u.Backup != "" && u.BackupPort != nil {
-			backupEndpointsKey := configs.GenerateEndpointsKey(transportServer.Namespace, u.Backup, nil, *u.BackupPort)
-			backupEndps, external, err := lbc.getEndpointsForUpstream(transportServer.Namespace, u.Backup, *u.BackupPort)
-			if err != nil {
-				glog.Warningf("Error getting Endpoints for Upstream %v: %v", u.Name, err)
-			}
-			if err == nil && external {
-				externalNameSvcs[configs.GenerateExternalNameSvcKey(transportServer.Namespace, u.Backup)] = true
-			}
-			bendps := getIPAddressesFromEndpoints(backupEndps)
+			bendps, backupEndpointsKey := lbc.getTransportServerBackupEndpointsAndKey(transportServer, u, externalNameSvcs)
 			endpoints[backupEndpointsKey] = bendps
 		}
 	}