/
secretbinding.go
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/
secretbinding.go
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// Copyright (c) 2018 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 secretbinding
import (
"context"
"fmt"
"sync"
"time"
"github.com/go-logr/logr"
"k8s.io/apimachinery/pkg/util/wait"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
"github.com/gardener/gardener/pkg/controllerutils"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
)
// ControllerName is the name of this controller.
const ControllerName = "secretbinding"
// Controller controls SecretBindings.
type Controller struct {
reconciler reconcile.Reconciler
secretBindingProviderReconciler reconcile.Reconciler
secretBindingQueue workqueue.RateLimitingInterface
shootQueue workqueue.RateLimitingInterface
log logr.Logger
hasSyncedFuncs []cache.InformerSynced
workerCh chan int
numberOfRunningWorkers int
}
// NewSecretBindingController takes a Kubernetes client for the Garden clusters <k8sGardenClient>, a struct
// holding information about the acting Gardener, a <secretBindingInformer>, and a <recorder> for
// event recording. It creates a new Gardener controller.
func NewSecretBindingController(
ctx context.Context,
log logr.Logger,
mgr manager.Manager,
) (
*Controller,
error,
) {
log = log.WithName(ControllerName)
gardenClient := mgr.GetClient()
gardenCache := mgr.GetCache()
secretBindingInformer, err := gardenCache.GetInformer(ctx, &gardencorev1beta1.SecretBinding{})
if err != nil {
return nil, fmt.Errorf("failed to get SecretBinding Informer: %w", err)
}
shootInformer, err := gardenCache.GetInformer(ctx, &gardencorev1beta1.Shoot{})
if err != nil {
return nil, fmt.Errorf("failed to get Shoot Informer: %w", err)
}
secretBindingController := &Controller{
reconciler: NewSecretBindingReconciler(gardenClient, mgr.GetEventRecorderFor(ControllerName+"-controller")),
secretBindingProviderReconciler: NewSecretBindingProviderReconciler(gardenClient),
secretBindingQueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "SecretBinding"),
shootQueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "Shoot"),
log: log,
workerCh: make(chan int),
}
secretBindingInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: secretBindingController.secretBindingAdd,
UpdateFunc: secretBindingController.secretBindingUpdate,
DeleteFunc: secretBindingController.secretBindingDelete,
})
shootInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: secretBindingController.shootAdd,
})
secretBindingController.hasSyncedFuncs = append(secretBindingController.hasSyncedFuncs, secretBindingInformer.HasSynced, shootInformer.HasSynced)
return secretBindingController, nil
}
// Run runs the Controller until the given stop channel can be read from.
func (c *Controller) Run(ctx context.Context, secretBindingWorkers, secretBindingProviderWorkers int) {
var waitGroup sync.WaitGroup
if !cache.WaitForCacheSync(ctx.Done(), c.hasSyncedFuncs...) {
c.log.Error(wait.ErrWaitTimeout, "Timed out waiting for caches to sync")
return
}
// Count number of running workers.
go func() {
for res := range c.workerCh {
c.numberOfRunningWorkers += res
}
}()
c.log.Info("SecretBinding controller initialized")
for i := 0; i < secretBindingWorkers; i++ {
controllerutils.CreateWorker(ctx, c.secretBindingQueue, "SecretBinding", c.reconciler, &waitGroup, c.workerCh, controllerutils.WithLogger(c.log))
}
for i := 0; i < secretBindingProviderWorkers; i++ {
controllerutils.CreateWorker(ctx, c.shootQueue, "SecretBinding Provider", c.secretBindingProviderReconciler, &waitGroup, c.workerCh, controllerutils.WithLogger(c.log.WithName(providerTypeReconcilerName)))
}
// Shutdown handling
<-ctx.Done()
c.secretBindingQueue.ShutDown()
c.shootQueue.ShutDown()
for {
queueLengths := c.secretBindingQueue.Len() + c.shootQueue.Len()
if queueLengths == 0 && c.numberOfRunningWorkers == 0 {
c.log.V(1).Info("No running SecretBinding worker and no items left in the queues. Terminating SecretBinding controller")
break
}
c.log.V(1).Info("Waiting for SecretBinding workers to finish", "numberOfRunningWorkers", c.numberOfRunningWorkers, "queueLength", queueLengths)
time.Sleep(5 * time.Second)
}
waitGroup.Wait()
}