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add.go
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add.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 tokenrequestor
import (
"fmt"
resourcesv1alpha1 "github.com/gardener/gardener/pkg/apis/resources/v1alpha1"
"github.com/spf13/pflag"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/util/clock"
"k8s.io/apimachinery/pkg/util/wait"
corev1clientset "k8s.io/client-go/kubernetes/typed/core/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/cluster"
crcontroller "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/source"
)
// ControllerName is the name of the controller.
const ControllerName = "token-requestor"
// defaultControllerConfig is the default config for the controller.
var defaultControllerConfig ControllerConfig
// ControllerOptions are options for adding the controller to a Manager.
type ControllerOptions struct {
maxConcurrentWorkers int
}
// ControllerConfig is the completed configuration for the controller.
type ControllerConfig struct {
MaxConcurrentWorkers int
TargetCluster cluster.Cluster
}
// AddToManagerWithOptions adds the controller to a Manager with the given config.
func AddToManagerWithOptions(mgr manager.Manager, conf ControllerConfig) error {
if conf.MaxConcurrentWorkers == 0 {
return nil
}
coreV1Client, err := corev1clientset.NewForConfig(conf.TargetCluster.GetConfig())
if err != nil {
return fmt.Errorf("could not create coreV1Client: %w", err)
}
ctrl, err := crcontroller.New(ControllerName, mgr, crcontroller.Options{
MaxConcurrentReconciles: conf.MaxConcurrentWorkers,
Reconciler: NewReconciler(clock.RealClock{}, wait.Jitter, conf.TargetCluster.GetClient(), coreV1Client),
})
if err != nil {
return fmt.Errorf("unable to set up tokenRequestor controller: %w", err)
}
return ctrl.Watch(
&source.Kind{Type: &corev1.Secret{}},
&handler.EnqueueRequestForObject{},
predicate.Funcs{
CreateFunc: func(e event.CreateEvent) bool { return isRelevantSecret(e.Object) },
UpdateFunc: func(e event.UpdateEvent) bool { return isRelevantSecretUpdate(e.ObjectOld, e.ObjectNew) },
DeleteFunc: func(e event.DeleteEvent) bool { return isRelevantSecret(e.Object) },
GenericFunc: func(e event.GenericEvent) bool { return false },
},
)
}
// AddToManager adds the controller to a Manager using the default config.
func AddToManager(mgr manager.Manager) error {
return AddToManagerWithOptions(mgr, defaultControllerConfig)
}
// AddFlags adds the needed command line flags to the given FlagSet.
func (o *ControllerOptions) AddFlags(fs *pflag.FlagSet) {
fs.IntVar(&o.maxConcurrentWorkers, "token-requestor-max-concurrent-workers", 0, "number of worker threads for concurrent token request reconciliations (default: 0)")
}
// Complete completes the given command line flags and set the defaultControllerConfig accordingly.
func (o *ControllerOptions) Complete() error {
defaultControllerConfig = ControllerConfig{
MaxConcurrentWorkers: o.maxConcurrentWorkers,
}
return nil
}
// Completed returns the completed ControllerConfig.
func (o *ControllerOptions) Completed() *ControllerConfig {
return &defaultControllerConfig
}
func isRelevantSecret(obj client.Object) bool {
secret, ok := obj.(*corev1.Secret)
if !ok {
return false
}
return secret.Labels != nil && secret.Labels[resourcesv1alpha1.ResourceManagerPurpose] == resourcesv1alpha1.LabelPurposeTokenRequest
}
func isRelevantSecretUpdate(oldObj, newObj client.Object) bool {
return isRelevantSecret(newObj) || (isRelevantSecret(oldObj) && !isRelevantSecret(newObj))
}