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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"
"fmt"
"sync"
"time"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap/keys"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/gardenlet/apis/config"
confighelper "github.com/gardener/gardener/pkg/gardenlet/apis/config/helper"
"github.com/gardener/gardener/pkg/healthz"
"github.com/gardener/gardener/pkg/logger"
"github.com/gardener/gardener/pkg/utils/imagevector"
)
// Controller controls Seeds.
type Controller struct {
reconciler reconcile.Reconciler
leaseReconciler reconcile.Reconciler
extensionCheckReconciler reconcile.Reconciler
seedQueue workqueue.RateLimitingInterface
seedLeaseQueue workqueue.RateLimitingInterface
seedExtensionCheckQueue workqueue.RateLimitingInterface
hasSyncedFuncs []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 <seedInformer>, and a <recorder> for
// event recording. It creates a new Gardener controller.
func NewSeedController(
ctx context.Context,
clientMap clientmap.ClientMap,
healthManager healthz.Manager,
imageVector imagevector.ImageVector,
componentImageVectors imagevector.ComponentImageVectors,
identity *gardencorev1beta1.Gardener,
clientCertificateExpirationTimestamp *metav1.Time,
config *config.GardenletConfiguration,
recorder record.EventRecorder,
) (*Controller, error) {
gardenClient, err := clientMap.GetClient(ctx, keys.ForGarden())
if err != nil {
return nil, err
}
seedInformer, err := gardenClient.Cache().GetInformer(ctx, &gardencorev1beta1.Seed{})
if err != nil {
return nil, fmt.Errorf("failed to get Seed Informer: %w", err)
}
controllerInstallationInformer, err := gardenClient.Cache().GetInformer(ctx, &gardencorev1beta1.ControllerInstallation{})
if err != nil {
return nil, fmt.Errorf("failed to get ControllerInstallation Informer: %w", err)
}
seedController := &Controller{
reconciler: newReconciler(clientMap, recorder, logger.Logger, imageVector, componentImageVectors, identity, clientCertificateExpirationTimestamp, config),
leaseReconciler: NewLeaseReconciler(clientMap, logger.Logger, healthManager, metav1.Now, config),
// TODO: move this reconciler to controller-manager and let it run once for all Seeds, no Seed specifics required here
extensionCheckReconciler: NewExtensionCheckReconciler(clientMap, logger.Logger, metav1.Now),
seedQueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "seed"),
seedLeaseQueue: workqueue.NewNamedRateLimitingQueue(workqueue.NewItemExponentialFailureRateLimiter(time.Millisecond, 2*time.Second), "seed-lease"),
seedExtensionCheckQueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "seed-extension-check"),
workerCh: make(chan int),
}
seedInformer.AddEventHandler(cache.FilteringResourceEventHandler{
FilterFunc: controllerutils.SeedFilterFunc(confighelper.SeedNameFromSeedConfig(config.SeedConfig)),
Handler: cache.ResourceEventHandlerFuncs{
AddFunc: seedController.seedAdd,
UpdateFunc: seedController.seedUpdate,
DeleteFunc: seedController.seedDelete,
},
})
seedInformer.AddEventHandler(cache.FilteringResourceEventHandler{
FilterFunc: controllerutils.SeedFilterFunc(confighelper.SeedNameFromSeedConfig(config.SeedConfig)),
Handler: cache.ResourceEventHandlerFuncs{
AddFunc: seedController.seedLeaseAdd,
},
})
controllerInstallationInformer.AddEventHandler(cache.FilteringResourceEventHandler{
FilterFunc: controllerutils.ControllerInstallationFilterFunc(confighelper.SeedNameFromSeedConfig(config.SeedConfig)),
Handler: cache.ResourceEventHandlerFuncs{
AddFunc: seedController.controllerInstallationOfSeedAdd,
UpdateFunc: seedController.controllerInstallationOfSeedUpdate,
DeleteFunc: seedController.controllerInstallationOfSeedDelete,
},
})
seedController.hasSyncedFuncs = []cache.InformerSynced{
seedInformer.HasSynced,
controllerInstallationInformer.HasSynced,
}
return seedController, nil
}
// 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.hasSyncedFuncs...) {
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.CreateWorker(ctx, c.seedQueue, "Seed", c.reconciler, &waitGroup, c.workerCh)
controllerutils.CreateWorker(ctx, c.seedLeaseQueue, "Seed Lease", c.leaseReconciler, &waitGroup, c.workerCh)
controllerutils.CreateWorker(ctx, c.seedExtensionCheckQueue, "Seed Extension Check", c.extensionCheckReconciler, &waitGroup, c.workerCh)
}
// Shutdown handling
<-ctx.Done()
c.seedQueue.ShutDown()
c.seedLeaseQueue.ShutDown()
c.seedExtensionCheckQueue.ShutDown()
for {
if c.seedQueue.Len() == 0 && c.seedLeaseQueue.Len() == 0 && c.seedExtensionCheckQueue.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()+c.seedLeaseQueue.Len()+c.seedExtensionCheckQueue.Len())
time.Sleep(5 * time.Second)
}
waitGroup.Wait()
}