Sotw add limitador reconcile (#887)

* ADD: Limitador sotw reconcile

This sets up the subscription for events on kuadrant and limitador
resources. The reconcile only is preformed if the limitador resource
does not exist.

---------

Signed-off-by: Jim Fitzpatrick <[email protected]>

controllers/limitador_reconciler.go

@@ -1,8 +1,21 @@
 package controllers
 
 import (
+	"context"
+	"strings"
+	"sync"
+
+	limitadorv1alpha1 "github.com/kuadrant/limitador-operator/api/v1alpha1"
 	"github.com/kuadrant/policy-machinery/controller"
+	"github.com/kuadrant/policy-machinery/machinery"
+	"github.com/samber/lo"
+	"k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/client-go/dynamic"
+	"k8s.io/utils/ptr"
+
+	"github.com/kuadrant/kuadrant-operator/api/v1beta1"
+	"github.com/kuadrant/kuadrant-operator/pkg/common"
 )
 
 type LimitadorReconciler struct {
@@ -14,5 +27,85 @@ func NewLimitadorReconciler(client *dynamic.DynamicClient) *LimitadorReconciler
 }
 
 func (r *LimitadorReconciler) Subscription() *controller.Subscription {
-	return &controller.Subscription{}
+	return &controller.Subscription{
+		ReconcileFunc: r.Reconcile,
+		Events: []controller.ResourceEventMatcher{
+			{Kind: ptr.To(v1beta1.KuadrantGroupKind), EventType: ptr.To(controller.CreateEvent)},
+			{Kind: ptr.To(v1beta1.LimitadorGroupKind), EventType: ptr.To(controller.DeleteEvent)},
+		},
+	}
+}
+
+func (r *LimitadorReconciler) Reconcile(ctx context.Context, _ []controller.ResourceEvent, topology *machinery.Topology, _ error, _ *sync.Map) error {
+	logger := controller.LoggerFromContext(ctx).WithName("LimitadorResourceReconciler")
+	logger.Info("reconciling limtador resource", "status", "started")
+	defer logger.Info("reconciling limitador resource", "status", "completed")
+
+	kobjs := lo.FilterMap(topology.Objects().Roots(), func(item machinery.Object, _ int) (*v1beta1.Kuadrant, bool) {
+		if item.GroupVersionKind().Kind == v1beta1.KuadrantGroupKind.Kind {
+			return item.(*v1beta1.Kuadrant), true
+		}
+		return nil, false
+	})
+
+	kobj, err := GetOldestKuadrant(kobjs)
+	if err != nil {
+		if strings.Contains(err.Error(), "empty list passed") {
+			logger.Info("kuadrant resource not found, ignoring", "status", "skipping")
+			return nil
+		}
+		logger.Error(err, "cannont find kuadrant resource", "status", "error")
+		return err
+	}
+
+	lobjs := lo.FilterMap(topology.Objects().Objects().Items(), func(item machinery.Object, _ int) (machinery.Object, bool) {
+		if item.GroupVersionKind().Kind == v1beta1.LimitadorGroupKind.Kind {
+			return item, true
+		}
+		return nil, false
+	})
+
+	if len(lobjs) > 0 {
+		logger.Info("limitador resource already exists, no need to create", "status", "skipping")
+		return nil
+	}
+
+	limitador := &limitadorv1alpha1.Limitador{
+		TypeMeta: metav1.TypeMeta{
+			Kind:       "Limitador",
+			APIVersion: "limitador.kuadrant.io/v1alpha1",
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      common.LimitadorName,
+			Namespace: kobj.Namespace,
+			OwnerReferences: []metav1.OwnerReference{
+				{
+					APIVersion:         kobj.GroupVersionKind().GroupVersion().String(),
+					Kind:               kobj.GroupVersionKind().Kind,
+					Name:               kobj.Name,
+					UID:                kobj.UID,
+					BlockOwnerDeletion: ptr.To(true),
+					Controller:         ptr.To(true),
+				},
+			},
+		},
+		Spec: limitadorv1alpha1.LimitadorSpec{},
+	}
+
+	unstructuredLimitador, err := controller.Destruct(limitador)
+	if err != nil {
+		logger.Error(err, "failed to destruct limitador", "status", "error")
+		return err
+	}
+	logger.Info("creating limitador resource", "status", "processing")
+	_, err = r.Client.Resource(v1beta1.LimitadorsResource).Namespace(limitador.Namespace).Create(ctx, unstructuredLimitador, metav1.CreateOptions{})
+	if err != nil {
+		if errors.IsAlreadyExists(err) {
+			logger.Info("already created limitador resource", "status", "acceptable")
+		} else {
+			logger.Error(err, "failed to create limitador resource", "status", "error")
+			return err
+		}
+	}
+	return nil
 }