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controllerregistration.go
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controllerregistration.go
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// Copyright (c) 2018 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 controllerregistration
import (
"context"
"sync"
"time"
gardencoreinformers "github.com/gardener/gardener/pkg/client/core/informers/externalversions"
gardencorelisters "github.com/gardener/gardener/pkg/client/core/listers/core/v1alpha1"
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"
"github.com/gardener/gardener/pkg/controllermanager/apis/config"
controllerutils "github.com/gardener/gardener/pkg/controllermanager/controller/utils"
gardenmetrics "github.com/gardener/gardener/pkg/controllermanager/metrics"
"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"
)
// FinalizerName is the name of the ControllerRegistration finalizer.
const FinalizerName = "core.gardener.cloud/controllerregistration"
// Controller controls ControllerRegistration.
type Controller struct {
k8sGardenClient kubernetes.Interface
k8sGardenInformers gardeninformers.SharedInformerFactory
k8sGardenCoreInformers gardencoreinformers.SharedInformerFactory
config *config.ControllerManagerConfiguration
seedControl SeedControlInterface
controllerRegistrationControl ControlInterface
recorder record.EventRecorder
seedQueue workqueue.RateLimitingInterface
seedLister gardenlisters.SeedLister
seedSynced cache.InformerSynced
controllerRegistrationQueue workqueue.RateLimitingInterface
controllerRegistrationLister gardencorelisters.ControllerRegistrationLister
controllerRegistrationSynced cache.InformerSynced
controllerInstallationSynced cache.InformerSynced
workerCh chan int
numberOfRunningWorkers int
}
// NewController instantiates a new ControllerRegistration controller.
func NewController(k8sGardenClient kubernetes.Interface, gardenInformerFactory gardeninformers.SharedInformerFactory, gardenCoreInformerFactory gardencoreinformers.SharedInformerFactory, config *config.ControllerManagerConfiguration, recorder record.EventRecorder) *Controller {
var (
gardenInformer = gardenInformerFactory.Garden().V1beta1()
gardenCoreInformer = gardenCoreInformerFactory.Core().V1alpha1()
seedInformer = gardenInformer.Seeds()
seedLister = seedInformer.Lister()
seedQueue = workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "seed")
controllerRegistrationInformer = gardenCoreInformer.ControllerRegistrations()
controllerRegistrationLister = controllerRegistrationInformer.Lister()
controllerRegistrationQueue = workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "controllerregistration")
controllerInstallationInformer = gardenCoreInformer.ControllerInstallations()
controllerInstallationLister = controllerInstallationInformer.Lister()
)
controller := &Controller{
k8sGardenClient: k8sGardenClient,
k8sGardenInformers: gardenInformerFactory,
k8sGardenCoreInformers: gardenCoreInformerFactory,
seedControl: NewDefaultSeedControl(k8sGardenClient, gardenInformerFactory, gardenCoreInformerFactory, recorder, config, controllerRegistrationLister, controllerInstallationLister, controllerRegistrationQueue),
controllerRegistrationControl: NewDefaultControllerRegistrationControl(k8sGardenClient, gardenInformerFactory, gardenCoreInformerFactory, recorder, config, seedLister, controllerRegistrationLister, controllerInstallationLister),
config: config,
recorder: recorder,
seedLister: seedLister,
seedQueue: seedQueue,
controllerRegistrationLister: controllerRegistrationLister,
controllerRegistrationQueue: controllerRegistrationQueue,
workerCh: make(chan int),
}
seedInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: controller.seedAdd,
UpdateFunc: controller.seedUpdate,
DeleteFunc: controller.seedDelete,
})
controller.seedSynced = seedInformer.Informer().HasSynced
controllerRegistrationInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: controller.controllerRegistrationAdd,
UpdateFunc: controller.controllerRegistrationUpdate,
DeleteFunc: controller.controllerRegistrationDelete,
})
controller.controllerRegistrationSynced = controllerRegistrationInformer.Informer().HasSynced
controller.controllerInstallationSynced = controllerInstallationInformer.Informer().HasSynced
return controller
}
// 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.seedSynced, c.controllerRegistrationSynced, c.controllerInstallationSynced) {
logger.Logger.Error("Timed out waiting for caches to sync")
return
}
go func() {
for {
select {
case res := <-c.workerCh:
c.numberOfRunningWorkers += res
logger.Logger.Debugf("Current number of running ControllerRegistration workers is %d", c.numberOfRunningWorkers)
}
}
}()
logger.Logger.Info("ControllerRegistration controller initialized.")
for i := 0; i < workers; i++ {
controllerutils.CreateWorker(ctx, c.seedQueue, "Seed", c.reconcileSeedKey, &waitGroup, c.workerCh)
controllerutils.CreateWorker(ctx, c.controllerRegistrationQueue, "ControllerRegistration", c.reconcileControllerRegistrationKey, &waitGroup, c.workerCh)
}
// Shutdown handling
<-ctx.Done()
c.seedQueue.ShutDown()
c.controllerRegistrationQueue.ShutDown()
for {
if c.controllerRegistrationQueue.Len() == 0 && c.seedQueue.Len() == 0 && c.numberOfRunningWorkers == 0 {
logger.Logger.Debug("No running ControllerRegistration worker and no items left in the queues. Terminated ControllerRegistration controller...")
break
}
logger.Logger.Debugf("Waiting for %d ControllerRegistration worker(s) to finish (%d item(s) left in the queues)...", c.numberOfRunningWorkers, c.controllerRegistrationQueue.Len()+c.seedQueue.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(gardenmetrics.ControllerWorkerSum, prometheus.GaugeValue, float64(c.RunningWorkers()), "controllerregistration")
if err != nil {
gardenmetrics.ScrapeFailures.With(prometheus.Labels{"kind": "controllerregistration-controller"}).Inc()
return
}
ch <- metric
}