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controller.go
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controller.go
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// Copyright 2017 The etcd-operator Authors
//
// 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 controller
import (
"context"
"time"
api "github.com/coreos/etcd-operator/pkg/apis/etcd/v1beta2"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
)
func (b *Backup) run(ctx context.Context) {
source := cache.NewListWatchFromClient(
b.backupCRCli.EtcdV1beta2().RESTClient(),
api.EtcdBackupResourcePlural,
b.namespace,
fields.Everything(),
)
b.queue = workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "etcd-backup-operator")
b.indexer, b.informer = cache.NewIndexerInformer(source, &api.EtcdBackup{}, 0, cache.ResourceEventHandlerFuncs{
AddFunc: b.onAdd,
UpdateFunc: b.onUpdate,
DeleteFunc: b.onDelete,
}, cache.Indexers{})
defer b.queue.ShutDown()
b.logger.Info("starting backup controller")
go b.informer.Run(ctx.Done())
if !cache.WaitForCacheSync(ctx.Done(), b.informer.HasSynced) {
return
}
const numWorkers = 1
for i := 0; i < numWorkers; i++ {
go wait.Until(b.runWorker, time.Second, ctx.Done())
}
<-ctx.Done()
b.logger.Info("stopping backup controller")
}
func (b *Backup) onAdd(obj interface{}) {
key, err := cache.MetaNamespaceKeyFunc(obj)
if err != nil {
panic(err)
}
b.queue.Add(key)
}
func (b *Backup) onUpdate(oldObj, newObj interface{}) {
key, err := cache.MetaNamespaceKeyFunc(newObj)
if err != nil {
panic(err)
}
b.queue.Add(key)
}
func (b *Backup) onDelete(obj interface{}) {
key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
if err != nil {
panic(err)
}
b.queue.Add(key)
}