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controller.go
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controller.go
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// Copyright (c) 2021 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dnsrecord
import (
"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/predicate"
"sigs.k8s.io/controller-runtime/pkg/source"
extensionspredicate "github.com/gardener/gardener/extensions/pkg/predicate"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
"github.com/gardener/gardener/pkg/controllerutils/mapper"
predicateutils "github.com/gardener/gardener/pkg/controllerutils/predicate"
)
const (
// FinalizerName is the dnsrecord controller finalizer.
FinalizerName = "extensions.gardener.cloud/dnsrecord"
// ControllerName is the name of the controller
ControllerName = "dnsrecord_controller"
)
// AddArgs are arguments for adding an dnsrecord controller to a manager.
type AddArgs struct {
// Actuator is an dnsrecord actuator.
Actuator Actuator
// ControllerOptions are the controller options used for creating a controller.
// The options.Reconciler is always overridden with a reconciler created from the
// given actuator.
ControllerOptions controller.Options
// Predicates are the predicates to use.
// If unset, GenerationChangedPredicate will be used.
Predicates []predicate.Predicate
// Type is the type of the resource considered for reconciliation.
Type string
// IgnoreOperationAnnotation specifies whether to ignore the operation annotation or not.
// If the annotation is not ignored, the extension controller will only reconcile
// with a present operation annotation typically set during a reconcile (e.g in the maintenance time) by the Gardenlet
IgnoreOperationAnnotation bool
}
// DefaultPredicates returns the default predicates for a dnsrecord reconciler.
func DefaultPredicates(ignoreOperationAnnotation bool) []predicate.Predicate {
return extensionspredicate.DefaultControllerPredicates(ignoreOperationAnnotation,
// Special case for preconditions for the DNSRecord controller: Some DNSRecord resources are created in the
// 'garden' namespace and don't belong to a Shoot. Most other DNSRecord resources are created in regular shoot
// namespaces (in such cases we want to check whether the respective Shoot is failed). Consequently, we add both
// preconditions and ensure at least one of them applies.
predicateutils.Or(
extensionspredicate.IsInGardenNamespacePredicate,
extensionspredicate.ShootNotFailedPredicate(),
),
)
}
// Add creates a new dnsrecord controller and adds it to the given Manager.
func Add(mgr manager.Manager, args AddArgs) error {
args.ControllerOptions.Reconciler = NewReconciler(args.Actuator)
ctrl, err := controller.New(ControllerName, mgr, args.ControllerOptions)
if err != nil {
return err
}
predicates := extensionspredicate.AddTypePredicate(args.Predicates, args.Type)
if args.IgnoreOperationAnnotation {
if err := ctrl.Watch(
&source.Kind{Type: &extensionsv1alpha1.Cluster{}},
mapper.EnqueueRequestsFrom(ClusterToDNSRecordMapper(predicates), mapper.UpdateWithNew),
); err != nil {
return err
}
}
return ctrl.Watch(&source.Kind{Type: &extensionsv1alpha1.DNSRecord{}}, &handler.EnqueueRequestForObject{}, predicates...)
}