sigs.k8s.io/cluster-api@v1.7.1/controllers/remote/cluster_cache_reconciler.go (about)

     1  /*
     2  Copyright 2020 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package remote
    18  
    19  import (
    20  	"context"
    21  
    22  	"github.com/pkg/errors"
    23  	apierrors "k8s.io/apimachinery/pkg/api/errors"
    24  	ctrl "sigs.k8s.io/controller-runtime"
    25  	"sigs.k8s.io/controller-runtime/pkg/client"
    26  	"sigs.k8s.io/controller-runtime/pkg/controller"
    27  	"sigs.k8s.io/controller-runtime/pkg/reconcile"
    28  
    29  	clusterv1 "sigs.k8s.io/cluster-api/api/v1beta1"
    30  	"sigs.k8s.io/cluster-api/util/predicates"
    31  )
    32  
    33  // ClusterCacheReconciler is responsible for stopping remote cluster caches when
    34  // the cluster for the remote cache is being deleted.
    35  type ClusterCacheReconciler struct {
    36  	Client  client.Client
    37  	Tracker *ClusterCacheTracker
    38  
    39  	// WatchFilterValue is the label value used to filter events prior to reconciliation.
    40  	WatchFilterValue string
    41  }
    42  
    43  func (r *ClusterCacheReconciler) SetupWithManager(ctx context.Context, mgr ctrl.Manager, options controller.Options) error {
    44  	err := ctrl.NewControllerManagedBy(mgr).
    45  		Named("remote/clustercache").
    46  		For(&clusterv1.Cluster{}).
    47  		WithOptions(options).
    48  		WithEventFilter(predicates.ResourceHasFilterLabel(ctrl.LoggerFrom(ctx), r.WatchFilterValue)).
    49  		Complete(r)
    50  
    51  	if err != nil {
    52  		return errors.Wrap(err, "failed setting up with a controller manager")
    53  	}
    54  	return nil
    55  }
    56  
    57  // Reconcile reconciles Clusters and removes ClusterCaches for any Cluster that cannot be retrieved from the
    58  // management cluster.
    59  func (r *ClusterCacheReconciler) Reconcile(ctx context.Context, req reconcile.Request) (reconcile.Result, error) {
    60  	log := ctrl.LoggerFrom(ctx)
    61  	log.V(4).Info("Reconciling")
    62  
    63  	var cluster clusterv1.Cluster
    64  
    65  	err := r.Client.Get(ctx, req.NamespacedName, &cluster)
    66  	if err == nil {
    67  		log.V(4).Info("Cluster still exists")
    68  		return reconcile.Result{}, nil
    69  	} else if !apierrors.IsNotFound(err) {
    70  		log.Error(err, "Error retrieving cluster")
    71  		return reconcile.Result{}, err
    72  	}
    73  
    74  	log.V(2).Info("Cluster no longer exists")
    75  
    76  	r.Tracker.deleteAccessor(ctx, req.NamespacedName)
    77  
    78  	return reconcile.Result{}, nil
    79  }