Avoid reconciling policies multiple times

`SriovNetworkNodePolicy` reconcile function lists all node policies
and updates all SriovNetworkNodeState. Hence there is no need to
resync all of them periodically.

Avoid triggering multiple reconciliations when creating multiple
policies in a row (that is what happens when using yaml files).

Signed-off-by: Andrea Panattoni <[email protected]>

controllers/sriovnetworknodepolicy_controller.go

@@ -23,6 +23,7 @@ import (
 	"os"
 	"sort"
 	"strings"
+	"time"
 
 	errs "github.com/pkg/errors"
 	appsv1 "k8s.io/api/apps/v1"
@@ -35,11 +36,15 @@ import (
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/types"
 	kscheme "k8s.io/client-go/kubernetes/scheme"
+	"k8s.io/client-go/util/workqueue"
 	ctrl "sigs.k8s.io/controller-runtime"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 	"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
+	"sigs.k8s.io/controller-runtime/pkg/event"
+	"sigs.k8s.io/controller-runtime/pkg/handler"
 	"sigs.k8s.io/controller-runtime/pkg/log"
 	"sigs.k8s.io/controller-runtime/pkg/reconcile"
+	"sigs.k8s.io/controller-runtime/pkg/source"
 
 	dptypes "github.com/k8snetworkplumbingwg/sriov-network-device-plugin/pkg/types"
 
@@ -49,6 +54,8 @@ import (
 	"github.com/k8snetworkplumbingwg/sriov-network-operator/pkg/render"
 )
 
+const nodePolicySyncEventName = "node-policy-sync-event"
+
 // SriovNetworkNodePolicyReconciler reconciles a SriovNetworkNodePolicy object
 type SriovNetworkNodePolicyReconciler struct {
 	client.Client
@@ -69,8 +76,13 @@ type SriovNetworkNodePolicyReconciler struct {
 // For more details, check Reconcile and its Result here:
 // - https://pkg.go.dev/sigs.k8s.io/[email protected]/pkg/reconcile
 func (r *SriovNetworkNodePolicyReconciler) Reconcile(ctx context.Context, req ctrl.Request) (ctrl.Result, error) {
-	reqLogger := log.FromContext(ctx).WithValues("sriovnetworknodepolicy", req.NamespacedName)
 
+	// Only handle node-policy-sync-event
+	if req.Name != nodePolicySyncEventName {
+		return reconcile.Result{}, nil
+	}
+
+	reqLogger := log.FromContext(ctx).WithValues("sriovnetworknodepolicy", req.NamespacedName)
 	reqLogger.Info("Reconciling")
 
 	defaultPolicy := &sriovnetworkv1.SriovNetworkNodePolicy{}
@@ -152,8 +164,29 @@ func (r *SriovNetworkNodePolicyReconciler) Reconcile(ctx context.Context, req ct
 
 // SetupWithManager sets up the controller with the Manager.
 func (r *SriovNetworkNodePolicyReconciler) SetupWithManager(mgr ctrl.Manager) error {
+	qHandler := func(q workqueue.RateLimitingInterface) {
+		q.AddAfter(reconcile.Request{NamespacedName: types.NamespacedName{
+			Namespace: namespace,
+			Name:      nodePolicySyncEventName,
+		}}, time.Second)
+	}
+
+	squashAndDebounceHandler := handler.Funcs{
+		CreateFunc: func(e event.CreateEvent, q workqueue.RateLimitingInterface) {
+			log.Log.WithName("SriovNetworkNodePolicy").
+				Info("Enqueuing sync for create event", "resource", e.Object.GetName())
+			qHandler(q)
+		},
+		UpdateFunc: func(e event.UpdateEvent, q workqueue.RateLimitingInterface) {
+			log.Log.WithName("SriovNetworkNodePolicy").
+				Info("Enqueuing sync for create event", "resource", e.ObjectNew.GetName())
+			qHandler(q)
+		},
+	}
+
 	return ctrl.NewControllerManagedBy(mgr).
 		For(&sriovnetworkv1.SriovNetworkNodePolicy{}).
+		Watches(&source.Kind{Type: &sriovnetworkv1.SriovNetworkNodePolicy{}}, squashAndDebounceHandler).
 		Complete(r)
 }