fix: network status in ForeignCluster resource

This patch fixes the network status in the ForeignCluster resource.
Previously, when the connection or the configuration were missing no
conditions were shown, so who looked at the ForeignCluster status could
think that everything is correctly configured.
Moreover, this patch makes the status check more robust, collecting all
the errors first and only once we are sure that the module is enabled
(there is at least a network resource present), it writes the
errors in the status.

apis/core/v1beta1/foreigncluster_types.go

@@ -96,8 +96,11 @@ const (
 	APIServerStatusCondition ConditionType = "APIServerStatus"
 
 	// NETWORKING
+	// NetworkConfigurationStatusCondition tells whether the network configuration of the peer cluster is present.
+	NetworkConfigurationStatusCondition ConditionType = "NetworkConfigurationStatus"
 	// NetworkConnectionStatusCondition shows the network connection status.
 	NetworkConnectionStatusCondition ConditionType = "NetworkConnectionStatus"
+	NetworkGatewayPresenceCondition  ConditionType = "NetworkGatewayPresence"
 	// NetworkGatewayServerStatusCondition shows the network gateway server status.
 	NetworkGatewayServerStatusCondition ConditionType = "NetworkGatewayServerStatus"
 	// NetworkGatewayClientStatusCondition shows the network gateway client status.
@@ -139,7 +142,7 @@ const (
 // Condition contains details about state of a.
 type Condition struct {
 	// Type of the condition.
-	// +kubebuilder:validation:Enum="APIServerStatus";"NetworkConnectionStatus";"NetworkGatewayServerStatus";"NetworkGatewayClientStatus";"AuthIdentityControlPlaneStatus";"AuthTenantStatus";"OffloadingVirtualNodeStatus";"OffloadingNodeStatus"
+	// +kubebuilder:validation:Enum="APIServerStatus";"NetworkConnectionStatus";"NetworkGatewayServerStatus";"NetworkGatewayClientStatus";"NetworkGatewayPresence";"NetworkConfigurationStatus";"AuthIdentityControlPlaneStatus";"AuthTenantStatus";"OffloadingVirtualNodeStatus";"OffloadingNodeStatus"
 	//
 	//nolint:lll // ignore long lines given by Kubebuilder marker annotations
 	Type ConditionType `json:"type"`

deployments/liqo/charts/liqo-crds/crds/core.liqo.io_foreignclusters.yaml

@@ -107,6 +107,8 @@ spec:
                       - NetworkConnectionStatus
                       - NetworkGatewayServerStatus
                       - NetworkGatewayClientStatus
+                      - NetworkGatewayPresence
+                      - NetworkConfigurationStatus
                       - AuthIdentityControlPlaneStatus
                       - AuthTenantStatus
                       - OffloadingVirtualNodeStatus
@@ -170,6 +172,8 @@ spec:
                               - NetworkConnectionStatus
                               - NetworkGatewayServerStatus
                               - NetworkGatewayClientStatus
+                              - NetworkGatewayPresence
+                              - NetworkConfigurationStatus
                               - AuthIdentityControlPlaneStatus
                               - AuthTenantStatus
                               - OffloadingVirtualNodeStatus
@@ -231,6 +235,8 @@ spec:
                               - NetworkConnectionStatus
                               - NetworkGatewayServerStatus
                               - NetworkGatewayClientStatus
+                              - NetworkGatewayPresence
+                              - NetworkConfigurationStatus
                               - AuthIdentityControlPlaneStatus
                               - AuthTenantStatus
                               - OffloadingVirtualNodeStatus
@@ -292,6 +298,8 @@ spec:
                               - NetworkConnectionStatus
                               - NetworkGatewayServerStatus
                               - NetworkGatewayClientStatus
+                              - NetworkGatewayPresence
+                              - NetworkConfigurationStatus
                               - AuthIdentityControlPlaneStatus
                               - AuthTenantStatus
                               - OffloadingVirtualNodeStatus

pkg/liqo-controller-manager/core/foreigncluster-controller/conditions.go

@@ -24,6 +24,9 @@ const (
 	connectionErrorReason  = "ConnectionError"
 	connectionErrorMessage = "The network connection with the foreign cluster is in error"
 
+	connectionMissingReason  = "ConnectionMissing"
+	connectionMissingMessage = "There is no network connection with the foreign cluster"
+
 	gatewaysReadyReason  = "GatewaysReady"
 	gatewaysReadyMessage = "All gateway replicas are ready"
 
@@ -33,6 +36,18 @@ const (
 	gatewaysNotReadyReason  = "GatewaysNotReady"
 	gatewaysNotReadyMessage = "All gateway replicas are not ready"
 
+	gatewayMissingReason  = "GatewayMissing"
+	gatewayMissingMessage = "The gateway resource connecting to the foreign cluster is missing"
+
+	gatewayPresentReason  = "GatewayPresence"
+	gatewayPresentMessage = "There is a gateway connecting to the foreign cluster"
+
+	networkConfigurationPresenceReason  = "NetworkConfigurationPresence"
+	networkConfigurationPresenceMessage = "The network configuration of the peer cluster is present"
+
+	networkConfigurationMissingReason  = "NetworkConfigurationMissing"
+	networkConfigurationMissingMessage = "The network configuration for the connection with the foreign cluster is missing"
+
 	tenantReadyReason  = "TenantReady"
 	tenantReadyMessage = "The tenant has been successfully configured"
 

pkg/liqo-controller-manager/core/foreigncluster-controller/foreigncluster_controller.go

@@ -170,6 +170,7 @@ func (r *ForeignClusterReconciler) SetupWithManager(mgr ctrl.Manager, workers in
 
 	return ctrl.NewControllerManagedBy(mgr).Named(consts.CtrlForeignCluster).
 		For(&liqov1beta1.ForeignCluster{}, builder.WithPredicates(foreignClusterPredicate)).
+		Watches(&networkingv1beta1.Configuration{}, handler.EnqueueRequestsFromMapFunc(r.foreignclusterEnqueuer)).
 		Watches(&networkingv1beta1.Connection{}, handler.EnqueueRequestsFromMapFunc(r.foreignclusterEnqueuer)).
 		Watches(&networkingv1beta1.GatewayServer{}, handler.EnqueueRequestsFromMapFunc(r.foreignclusterEnqueuer)).
 		Watches(&networkingv1beta1.GatewayClient{}, handler.EnqueueRequestsFromMapFunc(r.foreignclusterEnqueuer)).

pkg/liqo-controller-manager/core/foreigncluster-controller/status.go

@@ -35,6 +35,12 @@ import (
 	"github.com/liqotech/liqo/pkg/utils/pod"
 )
 
+type statusException struct {
+	liqov1beta1.ConditionStatusType
+	Reason  string
+	Message string
+}
+
 func (r *ForeignClusterReconciler) clearStatusExceptConditions(foreignCluster *liqov1beta1.ForeignCluster) {
 	foreignCluster.Status = liqov1beta1.ForeignClusterStatus{
 		Role: liqov1beta1.UnknownRole,
@@ -56,20 +62,20 @@ func (r *ForeignClusterReconciler) clearStatusExceptConditions(foreignCluster *l
 	}
 }
 
-func (r *ForeignClusterReconciler) handleNetworkingModuleStatus(ctx context.Context,
-	fc *liqov1beta1.ForeignCluster, moduleEnabled bool) error {
-	if !moduleEnabled {
-		clearModule(&fc.Status.Modules.Networking)
-		return nil
-	}
-
+func (r *ForeignClusterReconciler) handleConnectionStatus(ctx context.Context,
+	fc *liqov1beta1.ForeignCluster, statusExceptions map[liqov1beta1.ConditionType]statusException) error {
 	clusterID := fc.Spec.ClusterID
 
 	connection, err := getters.GetConnectionByClusterID(ctx, r.Client, string(clusterID))
 	switch {
 	case errors.IsNotFound(err):
 		klog.V(6).Infof("Connection resource not found for ForeignCluster %q", clusterID)
 		fcutils.DeleteModuleCondition(&fc.Status.Modules.Networking, liqov1beta1.NetworkConnectionStatusCondition)
+		statusExceptions[liqov1beta1.NetworkConnectionStatusCondition] = statusException{
+			ConditionStatusType: liqov1beta1.ConditionStatusNotReady,
+			Reason:              connectionMissingReason,
+			Message:             connectionMissingMessage,
+		}
 	case err != nil:
 		klog.Errorf("an error occurred while getting the Connection resource for the ForeignCluster %q: %s", clusterID, err)
 		return err
@@ -90,15 +96,38 @@ func (r *ForeignClusterReconciler) handleNetworkingModuleStatus(ctx context.Cont
 				connectionErrorReason, connectionErrorMessage)
 		}
 	}
+	return nil
+}
+
+func (r *ForeignClusterReconciler) handleGatewaysStatus(ctx context.Context,
+	fc *liqov1beta1.ForeignCluster, statusExceptions map[liqov1beta1.ConditionType]statusException) error {
+	clusterID := fc.Spec.ClusterID
+
+	gwServer, errServer := getters.GetGatewayServerByClusterID(ctx, r.Client, clusterID)
+	gwClient, errClient := getters.GetGatewayClientByClusterID(ctx, r.Client, clusterID)
+
+	if errors.IsNotFound(errServer) && errors.IsNotFound(errClient) {
+		klog.V(6).Infof("Both GatewayServer and GatewayClient resources not found for ForeignCluster %q", clusterID)
+		statusExceptions[liqov1beta1.NetworkGatewayPresenceCondition] = statusException{
+			ConditionStatusType: liqov1beta1.ConditionStatusNotReady,
+			Reason:              gatewayMissingReason,
+			Message:             gatewayMissingMessage,
+		}
+	} else {
+		statusExceptions[liqov1beta1.NetworkGatewayPresenceCondition] = statusException{
+			ConditionStatusType: liqov1beta1.ConditionStatusReady,
+			Reason:              gatewayPresentReason,
+			Message:             gatewayPresentMessage,
+		}
+	}
 
-	gwServer, err := getters.GetGatewayServerByClusterID(ctx, r.Client, clusterID)
 	switch {
-	case errors.IsNotFound(err):
+	case errors.IsNotFound(errServer):
 		klog.V(6).Infof("GatewayServer resource not found for ForeignCluster %q", clusterID)
 		fcutils.DeleteModuleCondition(&fc.Status.Modules.Networking, liqov1beta1.NetworkGatewayServerStatusCondition)
-	case err != nil:
-		klog.Errorf("an error occurred while getting the GatewayServer resource for the ForeignCluster %q: %s", clusterID, err)
-		return err
+	case errServer != nil:
+		klog.Errorf("an error occurred while getting the GatewayServer resource for the ForeignCluster %q: %s", clusterID, errServer)
+		return errServer
 	default:
 		fcutils.EnableModuleNetworking(fc)
 		gwDeployment := &appsv1.Deployment{
@@ -127,14 +156,13 @@ func (r *ForeignClusterReconciler) handleNetworkingModuleStatus(ctx context.Cont
 		}
 	}
 
-	gwClient, err := getters.GetGatewayClientByClusterID(ctx, r.Client, clusterID)
 	switch {
-	case errors.IsNotFound(err):
+	case errors.IsNotFound(errClient):
 		klog.V(6).Infof("GatewayClient resource not found for ForeignCluster %q", clusterID)
 		fcutils.DeleteModuleCondition(&fc.Status.Modules.Networking, liqov1beta1.NetworkGatewayClientStatusCondition)
-	case err != nil:
-		klog.Errorf("an error occurred while getting the GatewayClient resource for the ForeignCluster %q: %s", clusterID, err)
-		return err
+	case errClient != nil:
+		klog.Errorf("an error occurred while getting the GatewayClient resource for the ForeignCluster %q: %s", clusterID, errClient)
+		return errClient
 	default:
 		fcutils.EnableModuleNetworking(fc)
 		gwDeployment := &appsv1.Deployment{
@@ -166,6 +194,64 @@ func (r *ForeignClusterReconciler) handleNetworkingModuleStatus(ctx context.Cont
 	return nil
 }
 
+func (r *ForeignClusterReconciler) handleNetworkConfigurationStatus(ctx context.Context,
+	fc *liqov1beta1.ForeignCluster, statusExceptions map[liqov1beta1.ConditionType]statusException) error {
+	clusterID := fc.Spec.ClusterID
+	_, err := getters.GetConfigurationByClusterID(ctx, r.Client, clusterID)
+	switch {
+	case errors.IsNotFound(err):
+		klog.V(6).Infof("Configuration resource not found for ForeignCluster %q", clusterID)
+		fcutils.DeleteModuleCondition(&fc.Status.Modules.Networking, liqov1beta1.NetworkConfigurationStatusCondition)
+		statusExceptions[liqov1beta1.NetworkConfigurationStatusCondition] = statusException{
+			ConditionStatusType: liqov1beta1.ConditionStatusNotReady,
+			Reason:              networkConfigurationMissingReason,
+			Message:             networkConfigurationMissingMessage,
+		}
+	case err != nil:
+		klog.Errorf("an error occurred while getting the Configuration resource for the ForeignCluster %q: %s", clusterID, err)
+		return err
+	default:
+		fcutils.EnableModuleNetworking(fc)
+		fcutils.EnsureModuleCondition(&fc.Status.Modules.Networking,
+			liqov1beta1.NetworkConfigurationStatusCondition, liqov1beta1.ConditionStatusReady,
+			networkConfigurationPresenceReason, networkConfigurationPresenceMessage)
+	}
+	return nil
+}
+
+func (r *ForeignClusterReconciler) handleNetworkingModuleStatus(ctx context.Context,
+	fc *liqov1beta1.ForeignCluster, moduleEnabled bool) error {
+	if !moduleEnabled {
+		clearModule(&fc.Status.Modules.Networking)
+		return nil
+	}
+
+	statusExceptions := map[liqov1beta1.ConditionType]statusException{}
+
+	if err := r.handleNetworkConfigurationStatus(ctx, fc, statusExceptions); err != nil {
+		return err
+	}
+
+	if err := r.handleGatewaysStatus(ctx, fc, statusExceptions); err != nil {
+		return err
+	}
+
+	if err := r.handleConnectionStatus(ctx, fc, statusExceptions); err != nil {
+		return err
+	}
+
+	// Write the exception in the status if the module is enabled
+	if fc.Status.Modules.Networking.Enabled {
+		for condition, condDescription := range statusExceptions {
+			fcutils.EnsureModuleCondition(&fc.Status.Modules.Networking,
+				condition, condDescription.ConditionStatusType,
+				condDescription.Reason, condDescription.Message)
+		}
+	}
+
+	return nil
+}
+
 func (r *ForeignClusterReconciler) handleAuthenticationModuleStatus(ctx context.Context,
 	fc *liqov1beta1.ForeignCluster, moduleEnabled bool, consumer, provider *bool) error {
 	if !moduleEnabled {