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cloudprofile.go
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cloudprofile.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 cloudprofile
import (
"context"
"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/controllermanager/controller/utils"
gardenmetrics "github.com/gardener/gardener/pkg/controllermanager/metrics"
"github.com/gardener/gardener/pkg/logger"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
"github.com/prometheus/client_golang/prometheus"
)
// Controller controls CloudProfiles.
type Controller struct {
k8sGardenClient kubernetes.Interface
k8sGardenInformers gardeninformers.SharedInformerFactory
control ControlInterface
cloudProfileLister gardenlisters.CloudProfileLister
cloudProfileQueue workqueue.RateLimitingInterface
cloudprofileSynced cache.InformerSynced
seedLister gardenlisters.SeedLister
shootLister gardenlisters.ShootLister
workerCh chan int
numberOfRunningWorkers int
}
// NewCloudProfileController takes a Kubernetes client <k8sGardenClient> and a <k8sGardenInformers> for the Garden clusters.
// It creates and return a new Garden controller to control CloudProfiles.
func NewCloudProfileController(k8sGardenClient kubernetes.Interface, k8sGardenInformers gardeninformers.SharedInformerFactory) *Controller {
var (
gardenv1beta1Informer = k8sGardenInformers.Garden().V1beta1()
cloudProfileInformer = gardenv1beta1Informer.CloudProfiles()
seedLister = gardenv1beta1Informer.Seeds().Lister()
shootLister = gardenv1beta1Informer.Shoots().Lister()
)
cloudProfileController := &Controller{
k8sGardenClient: k8sGardenClient,
k8sGardenInformers: k8sGardenInformers,
cloudProfileLister: cloudProfileInformer.Lister(),
cloudProfileQueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "cloudprofile"),
seedLister: seedLister,
shootLister: shootLister,
control: NewDefaultControl(k8sGardenClient, seedLister, shootLister),
workerCh: make(chan int),
}
cloudProfileInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: cloudProfileController.cloudProfileAdd,
UpdateFunc: cloudProfileController.cloudProfileUpdate,
DeleteFunc: cloudProfileController.cloudProfileDelete,
})
cloudProfileController.cloudprofileSynced = cloudProfileInformer.Informer().HasSynced
return cloudProfileController
}
// 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
// Check if informers cache has been populated
if !cache.WaitForCacheSync(ctx.Done(), c.cloudprofileSynced) {
logger.Logger.Error("Time 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 CloudProfile workers is %d", c.numberOfRunningWorkers)
}
}
}()
logger.Logger.Info("CloudProfile controller initialized.")
// Start the workers
for i := 0; i < workers; i++ {
controllerutils.CreateWorker(ctx, c.cloudProfileQueue, "cloudprofile", c.reconcileCloudProfileKey, &waitGroup, c.workerCh)
}
<-ctx.Done()
c.cloudProfileQueue.ShutDown()
for {
if c.cloudProfileQueue.Len() == 0 && c.numberOfRunningWorkers == 0 {
logger.Logger.Debug("No running CloudProfile worker and no items left in the queues. Terminated CloudProfile controller...")
break
}
logger.Logger.Debugf("Waiting for %d CloudProfile worker(s) to finish (%d item(s) left in the queues)...", c.numberOfRunningWorkers, c.cloudProfileQueue.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()), "cloudprofile")
if err != nil {
gardenmetrics.ScrapeFailures.With(prometheus.Labels{"kind": "cloudprofile-controller"}).Inc()
return
}
ch <- metric
}