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informer.go
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informer.go
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// Copyright 2018 The Operator-SDK 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 informer
import (
"context"
"time"
"github.com/sirupsen/logrus"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
)
type Informer interface {
Run(ctx context.Context)
}
type informer struct {
resourcePluralName string
sharedIndexInformer cache.SharedIndexInformer
queue workqueue.RateLimitingInterface
namespace string
context context.Context
deletedObjects map[string]interface{}
}
func New(resourcePluralName, namespace string, resourceClient dynamic.ResourceInterface, resyncPeriod int) Informer {
i := &informer{
resourcePluralName: resourcePluralName,
queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), resourcePluralName),
namespace: namespace,
deletedObjects: map[string]interface{}{},
}
resyncDuration := time.Duration(resyncPeriod) * time.Second
i.sharedIndexInformer = cache.NewSharedIndexInformer(
newListWatcherFromResourceClient(resourceClient), &unstructured.Unstructured{}, resyncDuration, cache.Indexers{},
)
i.sharedIndexInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: i.handleAddResourceEvent,
DeleteFunc: i.handleDeleteResourceEvent,
UpdateFunc: i.handleUpdateResourceEvent,
})
return i
}
func newListWatcherFromResourceClient(resourceClient dynamic.ResourceInterface) *cache.ListWatch {
listFunc := func(options metav1.ListOptions) (runtime.Object, error) {
return resourceClient.List(options)
}
watchFunc := func(options metav1.ListOptions) (watch.Interface, error) {
return resourceClient.Watch(options)
}
return &cache.ListWatch{ListFunc: listFunc, WatchFunc: watchFunc}
}
func (i *informer) Run(ctx context.Context) {
i.context = ctx
defer i.queue.ShutDown()
logrus.Infof("starting %s controller", i.resourcePluralName)
go i.sharedIndexInformer.Run(ctx.Done())
if !cache.WaitForCacheSync(ctx.Done(), i.sharedIndexInformer.HasSynced) {
panic("Timed out waiting for caches to sync")
}
const numWorkers = 1
for n := 0; n < numWorkers; n++ {
go wait.Until(i.runWorker, time.Second, ctx.Done())
}
<-ctx.Done()
logrus.Infof("stopping %s controller", i.resourcePluralName)
}
func (i *informer) handleAddResourceEvent(obj interface{}) {
key, err := cache.MetaNamespaceKeyFunc(obj)
if err != nil {
panic(err)
}
i.queue.Add(key)
}
func (i *informer) handleDeleteResourceEvent(obj interface{}) {
// For deletes we have to use this key function
// to handle the DeletedFinalStateUnknown case for the object
key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
if err != nil {
panic(err)
}
// TODO: Revisit the need for passing delete events to the handler
// Save the last known state for the deleted object
i.deletedObjects[key] = obj.(*unstructured.Unstructured).DeepCopy()
i.queue.Add(key)
}
func (i *informer) handleUpdateResourceEvent(oldObj, newObj interface{}) {
key, err := cache.MetaNamespaceKeyFunc(newObj)
if err != nil {
panic(err)
}
i.queue.Add(key)
}