/
backup_entry.go
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/
backup_entry.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 backupentry
import (
"context"
"sync"
"time"
gardencoreinformers "github.com/gardener/gardener/pkg/client/core/informers/externalversions"
gardencorelisters "github.com/gardener/gardener/pkg/client/core/listers/core/v1beta1"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/gardenlet"
"github.com/gardener/gardener/pkg/gardenlet/apis/config"
confighelper "github.com/gardener/gardener/pkg/gardenlet/apis/config/helper"
"github.com/gardener/gardener/pkg/logger"
"github.com/prometheus/client_golang/prometheus"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
)
// Controller controls BackupEntries.
type Controller struct {
config *config.GardenletConfiguration
reconciler reconcile.Reconciler
recorder record.EventRecorder
backupEntryQueue workqueue.RateLimitingInterface
backupEntrySynced cache.InformerSynced
seedLister gardencorelisters.SeedLister
workerCh chan int
numberOfRunningWorkers int
}
// NewBackupEntryController takes a Kubernetes client for the Garden clusters <k8sGardenClient>, a struct
// holding information about the acting Gardener, a <backupEntryInformer>, and a <recorder> for
// event recording. It creates a new Gardener controller.
func NewBackupEntryController(k8sGardenClient kubernetes.Interface, gardenCoreInformerFactory gardencoreinformers.SharedInformerFactory, config *config.GardenletConfiguration, recorder record.EventRecorder) *Controller {
var (
gardencorev1beta1Informer = gardenCoreInformerFactory.Core().V1beta1()
backupEntryInformer = gardencorev1beta1Informer.BackupEntries()
seedInformer = gardencorev1beta1Informer.Seeds()
seedLister = seedInformer.Lister()
)
backupEntryController := &Controller{
config: config,
reconciler: newReconciler(context.TODO(), k8sGardenClient.Client(), recorder, config),
recorder: recorder,
backupEntryQueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "BackupEntry"),
seedLister: seedLister,
workerCh: make(chan int),
}
backupEntryInformer.Informer().AddEventHandler(cache.FilteringResourceEventHandler{
FilterFunc: controllerutils.BackupEntryFilterFunc(confighelper.SeedNameFromSeedConfig(config.SeedConfig), seedLister, config.SeedSelector),
Handler: cache.ResourceEventHandlerFuncs{
AddFunc: backupEntryController.backupEntryAdd,
UpdateFunc: backupEntryController.backupEntryUpdate,
DeleteFunc: backupEntryController.backupEntryDelete,
},
})
backupEntryController.backupEntrySynced = backupEntryInformer.Informer().HasSynced
return backupEntryController
}
// Run runs the Controller until the given stop channel can be read from.
func (c *Controller) Run(ctx context.Context, workers int) {
var waitGroup sync.WaitGroup
if !cache.WaitForCacheSync(ctx.Done(), c.backupEntrySynced) {
logger.Logger.Error("Timed out waiting for caches 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 BackupEntry workers is %d", c.numberOfRunningWorkers)
}
}()
logger.Logger.Info("BackupEntry controller initialized.")
for i := 0; i < workers; i++ {
controllerutils.CreateWorker(ctx, c.backupEntryQueue, "backupentry", c.reconciler, &waitGroup, c.workerCh)
}
// Shutdown handling
<-ctx.Done()
c.backupEntryQueue.ShutDown()
for {
if c.backupEntryQueue.Len() == 0 && c.numberOfRunningWorkers == 0 {
logger.Logger.Info("No running BackupEntry worker and no items left in the queues. Terminated BackupEntry controller...")
break
}
logger.Logger.Infof("Waiting for %d BackupEntry worker(s) to finish (%d item(s) left in the queues)...", c.numberOfRunningWorkers, c.backupEntryQueue.Len())
time.Sleep(5 * time.Second)
}
waitGroup.Wait()
}
// RunningWorkers returns the number of running workers.
func (c *Controller) RunningWorkers() int {
return c.numberOfRunningWorkers
}
// CollectMetrics implements gardenmetrics.ControllerMetricsCollector interface
func (c *Controller) CollectMetrics(ch chan<- prometheus.Metric) {
metric, err := prometheus.NewConstMetric(gardenlet.ControllerWorkerSum, prometheus.GaugeValue, float64(c.RunningWorkers()), "backupentry")
if err != nil {
gardenlet.ScrapeFailures.With(prometheus.Labels{"kind": "backupentry-controller"}).Inc()
return
}
ch <- metric
}