Use controller runtime and operator sdk

Changing the framework to use controller
runtime and operator sdk. This allows to
add CRD controllers for Network, Provider
Network etc in the same operator. Binary
renamed to nfn-operator (Network funtion
networking).

Change-Id: Ic25a3c3f5f1418fc0614f3aede48b41d9c1156cd
Signed-off-by: Ritu Sood <ritu.sood@intel.com>

3 files changed, 233 insertions, 0 deletions

diff --git a/pkg/controller/add_pod.go b/pkg/controller/add_pod.go
new file mode 100644
index 0000000..cc5f562
--- /dev/null
+++ b/pkg/controller/add_pod.go
@@ -0,0 +1,10 @@
+package controller
+
+import (
+	"ovn4nfv-k8s-plugin/pkg/controller/pod"
+)
+
+func init() {
+	// AddToManagerFuncs is a list of functions to create controllers and add them to a manager.
+	AddToManagerFuncs = append(AddToManagerFuncs, pod.Add)
+}
diff --git a/pkg/controller/controller.go b/pkg/controller/controller.go
new file mode 100644
index 0000000..7c069f3
--- /dev/null
+++ b/pkg/controller/controller.go
@@ -0,0 +1,18 @@
+package controller
+
+import (
+	"sigs.k8s.io/controller-runtime/pkg/manager"
+)
+
+// AddToManagerFuncs is a list of functions to add all Controllers to the Manager
+var AddToManagerFuncs []func(manager.Manager) error
+
+// AddToManager adds all Controllers to the Manager
+func AddToManager(m manager.Manager) error {
+	for _, f := range AddToManagerFuncs {
+		if err := f(m); err != nil {
+			return err
+		}
+	}
+	return nil
+}
diff --git a/pkg/controller/pod/pod_controller.go b/pkg/controller/pod/pod_controller.go
new file mode 100644
index 0000000..8792985
--- /dev/null
+++ b/pkg/controller/pod/pod_controller.go
@@ -0,0 +1,205 @@
+package pod
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	corev1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/types"
+	"ovn4nfv-k8s-plugin/internal/pkg/ovn"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+	"sigs.k8s.io/controller-runtime/pkg/controller"
+	"sigs.k8s.io/controller-runtime/pkg/event"
+	"sigs.k8s.io/controller-runtime/pkg/handler"
+	"sigs.k8s.io/controller-runtime/pkg/manager"
+	"sigs.k8s.io/controller-runtime/pkg/predicate"
+	"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("controller_pod")
+
+const (
+	nfnNetworkAnnotation = "k8s.plugin.opnfv.org/nfn-network"
+)
+
+type nfnNetwork struct {
+	Type      string                   "json:\"type\""
+	Interface []map[string]interface{} "json:\"interface\""
+}
+
+// Add creates a new Pod 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 &ReconcilePod{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 that will call the provided Reconciler function in response
+	// to events.
+	c, err := controller.New("pod-controller", mgr, controller.Options{Reconciler: r})
+	if err != nil {
+		return err
+	}
+	// Define Predicates On Create and Update function
+	p := predicate.Funcs{
+		UpdateFunc: func(e event.UpdateEvent) bool {
+			annotaion := e.MetaNew.GetAnnotations()
+			// The object doesn't contain annotation ,nfnNetworkAnnotation so the event will be
+			// ignored.
+			if _, ok := annotaion[nfnNetworkAnnotation]; !ok {
+				return false
+			}
+			// If pod is already processed by OVN don't add event
+			if _, ok := annotaion[ovn.Ovn4nfvAnnotationTag]; ok {
+				return false
+			}
+			return true
+		},
+		CreateFunc: func(e event.CreateEvent) bool {
+			// The object doesn't contain annotation ,nfnNetworkAnnotation so the event will be
+			// ignored.
+			annotaion := e.Meta.GetAnnotations()
+			if _, ok := annotaion[nfnNetworkAnnotation]; !ok {
+				return false
+			}
+			return true
+		},
+		DeleteFunc: func(e event.DeleteEvent) bool {
+			// The object doesn't contain annotation ,nfnNetworkAnnotation so the event will be
+			// ignored.
+			annotaion := e.Meta.GetAnnotations()
+			if _, ok := annotaion[nfnNetworkAnnotation]; !ok {
+				return false
+			}
+			return true
+		},
+	}
+
+	// Watch for Pod create / update / delete events and call Reconcile
+	err = c.Watch(&source.Kind{Type: &corev1.Pod{}}, &handler.EnqueueRequestForObject{}, p)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+// blank assignment to verify that ReconcuilePod implements reconcile.Reconciler
+var _ reconcile.Reconciler = &ReconcilePod{}
+
+// ReconcilePod reconciles a ProviderNetwork object
+type ReconcilePod 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
+}
+
+// Reconcile function
+// 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 *ReconcilePod) Reconcile(request reconcile.Request) (reconcile.Result, error) {
+	reqLogger := log.WithValues("Request.Namespace", request.Namespace, "Request.Name", request.Name)
+	reqLogger.Info("Enter Reconciling Pod")
+
+	// Fetch the Pod instance
+	instance := &corev1.Pod{}
+	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
+			if instance.Name == "" || instance.Namespace == "" {
+				return reconcile.Result{}, nil
+			}
+			r.deleteLogicalPorts(request.Name, request.Namespace)
+			return reconcile.Result{}, nil
+		}
+		// Error reading the object - requeue the request.
+		return reconcile.Result{}, err
+	}
+	if instance.Name == "" || instance.Namespace == "" {
+		return reconcile.Result{}, nil
+	}
+	err = r.addLogicalPorts(instance)
+	if err != nil && err.Error() == "Failed to add ports" {
+		// Requeue the object
+		return reconcile.Result{}, err
+	}
+	reqLogger.Info("Exit Reconciling Pod")
+	return reconcile.Result{}, nil
+}
+
+// annotatePod annotates pod with the given annotations
+func (r *ReconcilePod) setPodAnnotation(pod *corev1.Pod, key, value string) error {
+
+	patchData := fmt.Sprintf(`{"metadata":{"annotations":{"%s":"%s"}}}`, key, value)
+	err := r.client.Patch(context.TODO(), pod, client.ConstantPatch(types.MergePatchType, []byte(patchData)))
+	if err != nil {
+		log.Error(err, "Updating pod failed", "pod", pod, "key", key, "value", value)
+		return err
+	}
+	return nil
+}
+
+func (r *ReconcilePod) addLogicalPorts(pod *corev1.Pod) error {
+
+	nfn, err := r.readPodAnnotation(pod)
+	if err != nil {
+		return err
+	}
+
+	switch {
+	case nfn.Type == "ovn4nfv":
+		ovnCtl, err := ovn.GetOvnController()
+		if err != nil {
+			return err
+		}
+		key, value := ovnCtl.AddLogicalPorts(pod, nfn.Interface)
+		if len(key) > 0 {
+			return r.setPodAnnotation(pod, key, value)
+		}
+		return fmt.Errorf("Failed to add ports")
+	default:
+		return fmt.Errorf("Unsupported Networking type %s", nfn.Type)
+	// Add other types here
+	}
+}
+
+func (r *ReconcilePod) deleteLogicalPorts(name, namesapce string) error {
+
+	// Run delete for all controllers; pod annonations inaccessible
+	ovnCtl, err := ovn.GetOvnController()
+	if err != nil {
+		return err
+	}
+	ovnCtl.DeleteLogicalPorts(name, namesapce)
+	return nil
+	// Add other types here
+}
+
+func (r *ReconcilePod) readPodAnnotation(pod *corev1.Pod) (*nfnNetwork, error) {
+	annotaion, ok := pod.Annotations[nfnNetworkAnnotation]
+	if !ok {
+		return nil, fmt.Errorf("Invalid annotations")
+	}
+	var nfn nfnNetwork
+	err := json.Unmarshal([]byte(annotaion), &nfn)
+	if err != nil {
+		log.Error(err, "Invalid nfn annotaion", "annotaiton", annotaion)
+		return nil, err
+	}
+	return &nfn, nil
+}