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backup_bucket.go
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backup_bucket.go
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// Copyright (c) 2019 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 backupbucket
import (
"context"
"fmt"
"sync"
"time"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap/keys"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/gardenlet/apis/config"
confighelper "github.com/gardener/gardener/pkg/gardenlet/apis/config/helper"
"github.com/gardener/gardener/pkg/logger"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
runtimecache "sigs.k8s.io/controller-runtime/pkg/cache"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
)
const (
// finalizerName is the backupbucket controller finalizer.
finalizerName = "core.gardener.cloud/backupbucket"
)
// Controller controls BackupBuckets.
type Controller struct {
gardenClient client.Client
config *config.GardenletConfiguration
reconciler reconcile.Reconciler
recorder record.EventRecorder
backupBucketInformer runtimecache.Informer
backupBucketQueue workqueue.RateLimitingInterface
workerCh chan int
numberOfRunningWorkers int
}
// NewBackupBucketController takes a Kubernetes client for the Garden clusters <k8sGardenClient>, a struct
// holding information about the acting Gardener, a <backupBucketInformer>, and a <recorder> for
// event recording. It creates a new Gardener controller.
func NewBackupBucketController(ctx context.Context, clientMap clientmap.ClientMap, config *config.GardenletConfiguration, recorder record.EventRecorder) (*Controller, error) {
gardenClient, err := clientMap.GetClient(ctx, keys.ForGarden())
if err != nil {
return nil, fmt.Errorf("failed to get garden client: %w", err)
}
backupBucketInformer, err := gardenClient.Cache().GetInformer(ctx, &gardencorev1beta1.BackupBucket{})
if err != nil {
return nil, fmt.Errorf("failed to get BackupBucket Informer: %w", err)
}
controller := &Controller{
gardenClient: gardenClient.Client(),
config: config,
reconciler: newReconciler(clientMap, recorder, config),
recorder: recorder,
backupBucketInformer: backupBucketInformer,
backupBucketQueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "BackupBucket"),
workerCh: make(chan int),
}
controller.backupBucketInformer.AddEventHandler(cache.FilteringResourceEventHandler{
FilterFunc: controllerutils.BackupBucketFilterFunc(confighelper.SeedNameFromSeedConfig(controller.config.SeedConfig)),
Handler: cache.ResourceEventHandlerFuncs{
AddFunc: controller.backupBucketAdd,
UpdateFunc: controller.backupBucketUpdate,
DeleteFunc: controller.backupBucketDelete,
},
})
return controller, nil
}
// Run runs the Controller until the given stop channel is closed.
func (c *Controller) Run(ctx context.Context, workers int) {
var waitGroup sync.WaitGroup
if !cache.WaitForCacheSync(ctx.Done(), c.backupBucketInformer.HasSynced) {
logger.Logger.Fatal("Timed out waiting for BackupBucket Informer to sync")
return
}
// Count number of running workers.
go func() {
for res := range c.workerCh {
c.numberOfRunningWorkers += res
logger.Logger.Debugf("Current number of running BackupBucket workers is %d", c.numberOfRunningWorkers)
}
}()
logger.Logger.Info("BackupBucket controller initialized.")
for i := 0; i < workers; i++ {
controllerutils.CreateWorker(ctx, c.backupBucketQueue, "backupbucket", c.reconciler, &waitGroup, c.workerCh)
}
// Shutdown handling
<-ctx.Done()
c.backupBucketQueue.ShutDown()
for {
if c.backupBucketQueue.Len() == 0 && c.numberOfRunningWorkers == 0 {
logger.Logger.Info("No running BackupBucket worker and no items left in the queues. Terminated BackupBucket controller...")
break
}
logger.Logger.Infof("Waiting for %d BackupBucket worker(s) to finish (%d item(s) left in the queues)...", c.numberOfRunningWorkers, c.backupBucketQueue.Len())
time.Sleep(5 * time.Second)
}
waitGroup.Wait()
}