Add CRD Controller for Network

Add CRD controller functionality for
Network creation and deletion. Related
generated code is uploaded in patch:
https://gerrit.opnfv.org/gerrit/#/c/ovn4nfv-k8s-plugin/+/68324/

Change-Id: Ibd3e652edc56aa1084f684438597e1b978977bbf
Signed-off-by: Ritu Sood <ritu.sood@intel.com>

4 files changed, 223 insertions, 2 deletions

diff --git a/pkg/apis/k8s/v1alpha1/network_types.go b/pkg/apis/k8s/v1alpha1/network_types.go
index a52dd58..a606dbb 100644
--- a/pkg/apis/k8s/v1alpha1/network_types.go
+++ b/pkg/apis/k8s/v1alpha1/network_types.go
@@ -42,8 +42,10 @@ type DnsSpec struct {
 const (
 	//Created indicates the status of success
 	Created = "Created"
-	//Indicates internal Irrecoverable Error
-	InternalError = "InternalError"
+	//CreateInternalError indicates create internal irrecoverable Error
+	CreateInternalError = "CreateInternalError"
+	//DeleteInternalError indicates delete internal irrecoverable Error
+	DeleteInternalError = "DeleteInternalError"
 )
 
 // NetworkStatus defines the observed state of Network
diff --git a/pkg/controller/add_network.go b/pkg/controller/add_network.go
new file mode 100644
index 0000000..d35657b
--- /dev/null
+++ b/pkg/controller/add_network.go
@@ -0,0 +1,10 @@
+package controller
+
+import (
+	"ovn4nfv-k8s-plugin/pkg/controller/network"
+)
+
+func init() {
+	// AddToManagerFuncs is a list of functions to create controllers and add them to a manager.
+	AddToManagerFuncs = append(AddToManagerFuncs, network.Add)
+}
diff --git a/pkg/controller/network/network_controller.go b/pkg/controller/network/network_controller.go
new file mode 100644
index 0000000..2392e3d
--- /dev/null
+++ b/pkg/controller/network/network_controller.go
@@ -0,0 +1,189 @@
+package network
+
+import (
+	"context"
+	"fmt"
+	k8sv1alpha1 "ovn4nfv-k8s-plugin/pkg/apis/k8s/v1alpha1"
+
+	//	corev1 "k8s.io/api/core/v1"
+	"github.com/go-logr/logr"
+	"k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/runtime"
+	"ovn4nfv-k8s-plugin/internal/pkg/ovn"
+	"ovn4nfv-k8s-plugin/pkg/utils"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/controller"
+	"sigs.k8s.io/controller-runtime/pkg/handler"
+	"sigs.k8s.io/controller-runtime/pkg/manager"
+	"sigs.k8s.io/controller-runtime/pkg/reconcile"
+	logf "sigs.k8s.io/controller-runtime/pkg/runtime/log"
+	"sigs.k8s.io/controller-runtime/pkg/source"
+)
+
+var log = logf.Log.WithName("network_controller")
+
+// Add creates a new Network Controller and adds it to the Manager. The Manager will set fields on the Controller
+// and Start it when the Manager is Started.
+func Add(mgr manager.Manager) error {
+	return add(mgr, newReconciler(mgr))
+}
+
+// newReconciler returns a new reconcile.Reconciler
+func newReconciler(mgr manager.Manager) reconcile.Reconciler {
+	return &ReconcileNetwork{client: mgr.GetClient(), scheme: mgr.GetScheme()}
+}
+
+// add adds a new Controller to mgr with r as the reconcile.Reconciler
+func add(mgr manager.Manager, r reconcile.Reconciler) error {
+	// Create a new controller
+	c, err := controller.New("network-controller", mgr, controller.Options{Reconciler: r})
+	if err != nil {
+		return err
+	}
+	// Watch for changes to primary resource Network
+	err = c.Watch(&source.Kind{Type: &k8sv1alpha1.Network{}}, &handler.EnqueueRequestForObject{})
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// blank assignment to verify that ReconcileNetwork implements reconcile.Reconciler
+var _ reconcile.Reconciler = &ReconcileNetwork{}
+
+// ReconcileNetwork reconciles a Network object
+type ReconcileNetwork struct {
+	// This client, initialized using mgr.Client() above, is a split client
+	// that reads objects from the cache and writes to the apiserver
+	client client.Client
+	scheme *runtime.Scheme
+}
+type reconcileFun func(instance *k8sv1alpha1.Network, reqLogger logr.Logger) error
+
+// Reconcile reads that state of the cluster for a Network object and makes changes based on the state read
+// and what is in the Network.Spec
+// The Controller will requeue the Request to be processed again if the returned error is non-nil or
+// Result.Requeue is true, otherwise upon completion it will remove the work from the queue.
+func (r *ReconcileNetwork) Reconcile(request reconcile.Request) (reconcile.Result, error) {
+	reqLogger := log.WithValues("Request.Namespace", request.Namespace, "Request.Name", request.Name)
+	reqLogger.V(1).Info("Reconciling Network")
+
+	// Fetch the Network instance
+	instance := &k8sv1alpha1.Network{}
+	err := r.client.Get(context.TODO(), request.NamespacedName, instance)
+	if err != nil {
+		if errors.IsNotFound(err) {
+			// Request object not found, could have been deleted after reconcile request.
+			// Owned objects are automatically garbage collected. For additional cleanup logic use finalizers.
+			// Return and don't requeue
+			reqLogger.V(1).Info("Network Object not found")
+			return reconcile.Result{}, nil
+		}
+		// Error reading the object - requeue the request.
+		return reconcile.Result{}, err
+	}
+	for _, fun := range []reconcileFun{
+		r.reconcileFinalizers,
+		r.createNetwork,
+	} {
+		if err = fun(instance, reqLogger); err != nil {
+			return reconcile.Result{}, err
+		}
+	}
+	return reconcile.Result{}, nil
+}
+
+const (
+	nfnNetworkFinalizer = "nfnCleanUpNetwork"
+)
+
+func (r *ReconcileNetwork) createNetwork(cr *k8sv1alpha1.Network, reqLogger logr.Logger) error {
+
+	if !cr.DeletionTimestamp.IsZero() {
+		// Marked for deletion
+		return nil
+	}
+	switch {
+	case cr.Spec.CniType == "ovn4nfv":
+		ovnCtl, err := ovn.GetOvnController()
+		if err != nil {
+			return err
+		}
+		err = ovnCtl.CreateNetwork(cr)
+		if err != nil {
+			// Log the error
+			reqLogger.Error(err, "Error Creating Network")
+			cr.Status.State = k8sv1alpha1.CreateInternalError
+		} else {
+			cr.Status.State = k8sv1alpha1.Created
+		}
+		err = r.client.Status().Update(context.TODO(), cr)
+		if err != nil {
+			return err
+		}
+		// If OVN internal error don't requeue
+		return nil
+		// Add other CNI types here
+	}
+	reqLogger.Info("CNI type not supported", "name", cr.Spec.CniType)
+	return fmt.Errorf("CNI type not supported")
+
+}
+
+func (r *ReconcileNetwork) deleteNetwork(cr *k8sv1alpha1.Network, reqLogger logr.Logger) error {
+
+	switch {
+	case cr.Spec.CniType == "ovn4nfv":
+		ovnCtl, err := ovn.GetOvnController()
+		if err != nil {
+			return err
+		}
+		err = ovnCtl.DeleteNetwork(cr)
+		if err != nil {
+			// Log the error
+			reqLogger.Error(err, "Error Delete Network")
+			cr.Status.State = k8sv1alpha1.DeleteInternalError
+			err = r.client.Status().Update(context.TODO(), cr)
+			if err != nil {
+				return err
+			}
+		}
+		// If OVN internal error don't requeue
+		return nil
+		// Add other CNI types here
+	}
+	reqLogger.Info("CNI type not supported", "name", cr.Spec.CniType)
+	return fmt.Errorf("CNI type not supported")
+}
+
+func (r *ReconcileNetwork) reconcileFinalizers(instance *k8sv1alpha1.Network, reqLogger logr.Logger) (err error) {
+
+	if !instance.DeletionTimestamp.IsZero() {
+		// Instance marked for deletion
+		if utils.Contains(instance.ObjectMeta.Finalizers, nfnNetworkFinalizer) {
+			reqLogger.V(1).Info("Finalizer found - delete network")
+			if err = r.deleteNetwork(instance, reqLogger); err != nil {
+				reqLogger.Error(err, "Delete network")
+			}
+			// Remove the finalizer even if Delete Network fails. Fatal error retry will not resolve
+			instance.ObjectMeta.Finalizers = utils.Remove(instance.ObjectMeta.Finalizers, nfnNetworkFinalizer)
+			if err = r.client.Update(context.TODO(), instance); err != nil {
+				reqLogger.Error(err, "Removing Finalize")
+				return err
+			}
+		}
+
+	} else {
+		// If finalizer doesn't exist add it
+		if !utils.Contains(instance.GetFinalizers(), nfnNetworkFinalizer) {
+			instance.SetFinalizers(append(instance.GetFinalizers(), nfnNetworkFinalizer))
+			if err = r.client.Update(context.TODO(), instance); err != nil {
+				reqLogger.Error(err, "Adding Finalize")
+				return err
+			}
+			reqLogger.V(1).Info("Finalizer added")
+		}
+	}
+	return nil
+}
diff --git a/pkg/utils/finalizer_utils.go b/pkg/utils/finalizer_utils.go
new file mode 100644
index 0000000..5f196c0
--- /dev/null
+++ b/pkg/utils/finalizer_utils.go
@@ -0,0 +1,20 @@
+package utils
+
+func Contains(slice []string, str string) bool {
+	for _, item := range slice {
+		if item == str {
+			return true
+		}
+	}
+	return false
+}
+
+func Remove(slice []string, str string) (result []string) {
+	for _, item := range slice {
+		if item == str {
+			continue
+		}
+		result = append(result, item)
+	}
+	return result
+}