/
seed.go
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/
seed.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 seed
import (
"context"
"sync"
"time"
gardencoreinformers "github.com/gardener/gardener/pkg/client/core/informers/externalversions"
gardencorelisters "github.com/gardener/gardener/pkg/client/core/listers/core/v1beta1"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap"
"github.com/gardener/gardener/pkg/controllermanager"
"github.com/gardener/gardener/pkg/controllermanager/apis/config"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/logger"
"github.com/prometheus/client_golang/prometheus"
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 Seeds.
type Controller struct {
clientMap clientmap.ClientMap
k8sGardenCoreInformers gardencoreinformers.SharedInformerFactory
config *config.ControllerManagerConfiguration
control ControlInterface
recorder record.EventRecorder
seedLister gardencorelisters.SeedLister
seedQueue workqueue.RateLimitingInterface
seedSynced cache.InformerSynced
shootLister gardencorelisters.ShootLister
shootSynced cache.InformerSynced
leaseSynced cache.InformerSynced
workerCh chan int
numberOfRunningWorkers int
}
// NewSeedController takes a Kubernetes client for the Garden clusters <k8sGardenClient>, a struct
// holding information about the acting Gardener, a <gardenInformerFactory>, and a <recorder> for
// event recording. It creates a new Gardener controller.
func NewSeedController(clientMap clientmap.ClientMap, gardenInformerFactory gardencoreinformers.SharedInformerFactory, kubeInformerFactory kubeinformers.SharedInformerFactory,
config *config.ControllerManagerConfiguration, recorder record.EventRecorder) *Controller {
var (
gardenCoreV1beta1Informer = gardenInformerFactory.Core().V1beta1()
seedInformer = gardenCoreV1beta1Informer.Seeds()
seedLister = seedInformer.Lister()
shootInformer = gardenCoreV1beta1Informer.Shoots()
shootLister = shootInformer.Lister()
leaseInformer = kubeInformerFactory.Coordination().V1().Leases()
leaseLister = leaseInformer.Lister()
)
seedController := &Controller{
clientMap: clientMap,
k8sGardenCoreInformers: gardenInformerFactory,
config: config,
control: NewDefaultControl(clientMap, leaseLister, shootLister, config),
recorder: recorder,
seedLister: seedLister,
shootLister: shootLister,
seedQueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "Seed"),
workerCh: make(chan int),
}
seedInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: seedController.seedAdd,
})
seedController.seedSynced = seedInformer.Informer().HasSynced
seedController.shootSynced = shootInformer.Informer().HasSynced
seedController.leaseSynced = leaseInformer.Informer().HasSynced
return seedController
}
// 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.shootSynced, c.leaseSynced) {
logger.Logger.Error("Timed out waiting for caches to sync")
return
}
// Count number of running workers.
go func() {
for res := range c.workerCh {
c.numberOfRunningWorkers += res
logger.Logger.Debugf("Current number of running Seed workers is %d", c.numberOfRunningWorkers)
}
}()
logger.Logger.Info("Seed controller initialized.")
for i := 0; i < workers; i++ {
controllerutils.DeprecatedCreateWorker(ctx, c.seedQueue, "Seed", c.reconcileSeedKey, &waitGroup, c.workerCh)
}
// Shutdown handling
<-ctx.Done()
c.seedQueue.ShutDown()
for {
if c.seedQueue.Len() == 0 && c.numberOfRunningWorkers == 0 {
logger.Logger.Debug("No running Seed worker and no items left in the queues. Terminated Seed controller...")
break
}
logger.Logger.Debugf("Waiting for %d Seed worker(s) to finish (%d item(s) left in the queues)...", c.numberOfRunningWorkers, 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(controllermanager.ControllerWorkerSum, prometheus.GaugeValue, float64(c.RunningWorkers()), "seed")
if err != nil {
controllermanager.ScrapeFailures.With(prometheus.Labels{"kind": "seed-controller"}).Inc()
return
}
ch <- metric
}