forked from gardener/gardener
/
secretbinding.go
132 lines (109 loc) · 4.77 KB
/
secretbinding.go
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// Copyright 2018 The Gardener 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 secretbinding
import (
"sync"
"time"
gardeninformers "github.com/gardener/gardener/pkg/client/garden/informers/externalversions"
gardenlisters "github.com/gardener/gardener/pkg/client/garden/listers/garden/v1beta1"
"github.com/gardener/gardener/pkg/client/kubernetes"
controllerutils "github.com/gardener/gardener/pkg/controller/utils"
"github.com/gardener/gardener/pkg/logger"
kubeinformers "k8s.io/client-go/informers"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
)
// Controller controls SecretBindings.
type Controller struct {
k8sGardenClient kubernetes.Client
k8sGardenInformers gardeninformers.SharedInformerFactory
k8sInformers kubeinformers.SharedInformerFactory
control ControlInterface
recorder record.EventRecorder
secretBindingLister gardenlisters.SecretBindingLister
secretBindingQueue workqueue.RateLimitingInterface
secretBindingSynced cache.InformerSynced
shootLister gardenlisters.ShootLister
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(k8sGardenClient kubernetes.Client, gardenInformerFactory gardeninformers.SharedInformerFactory, kubeInformerFactory kubeinformers.SharedInformerFactory, recorder record.EventRecorder) *Controller {
var (
gardenv1beta1Informer = gardenInformerFactory.Garden().V1beta1()
corev1Informer = kubeInformerFactory.Core().V1()
secretBindingInformer = gardenv1beta1Informer.SecretBindings()
secretBindingLister = secretBindingInformer.Lister()
secretLister = corev1Informer.Secrets().Lister()
shootLister = gardenv1beta1Informer.Shoots().Lister()
)
secretBindingController := &Controller{
k8sGardenClient: k8sGardenClient,
k8sGardenInformers: gardenInformerFactory,
control: NewDefaultControl(k8sGardenClient, gardenInformerFactory, recorder, secretLister, shootLister),
recorder: recorder,
secretBindingLister: secretBindingLister,
secretBindingQueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "SecretBinding"),
shootLister: shootLister,
workerCh: make(chan int),
}
secretBindingInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: secretBindingController.secretBindingAdd,
UpdateFunc: secretBindingController.secretBindingUpdate,
DeleteFunc: secretBindingController.secretBindingDelete,
})
secretBindingController.secretBindingSynced = secretBindingInformer.Informer().HasSynced
return secretBindingController
}
// Run runs the Controller until the given stop channel can be read from.
func (c *Controller) Run(workers int, stopCh <-chan struct{}) {
var waitGroup sync.WaitGroup
if !cache.WaitForCacheSync(stopCh, c.secretBindingSynced) {
logger.Logger.Error("Timed out waiting for caches to sync")
return
}
// Count number of running workers.
go func() {
for {
select {
case res := <-c.workerCh:
c.numberOfRunningWorkers += res
logger.Logger.Debugf("Current number of running SecretBinding workers is %d", c.numberOfRunningWorkers)
}
}
}()
logger.Logger.Info("SecretBinding controller initialized.")
for i := 0; i < workers; i++ {
controllerutils.CreateWorker(c.secretBindingQueue, "SecretBinding", c.reconcileSecretBindingKey, stopCh, &waitGroup, c.workerCh)
}
// Shutdown handling
<-stopCh
c.secretBindingQueue.ShutDown()
for {
if c.secretBindingQueue.Len() == 0 && c.numberOfRunningWorkers == 0 {
logger.Logger.Info("No running SecretBinding worker and no items left in the queues. Terminated SecretBinding controller...")
break
}
logger.Logger.Infof("Waiting for %d SecretBinding worker(s) to finish (%d item(s) left in the queues)...", c.numberOfRunningWorkers, c.secretBindingQueue.Len())
time.Sleep(5 * time.Second)
}
waitGroup.Wait()
}
// RunningWorkers returns the number of running workers.
func (c *Controller) RunningWorkers() int {
return c.numberOfRunningWorkers
}