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managedseedset.go
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managedseedset.go
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// Copyright (c) 2021 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 managedseedset
import (
"context"
"fmt"
"sync"
"time"
"github.com/sirupsen/logrus"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
"k8s.io/utils/pointer"
runtimecache "sigs.k8s.io/controller-runtime/pkg/cache"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
gardencorev1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
seedmanagementv1alpha1 "github.com/gardener/gardener/pkg/apis/seedmanagement/v1alpha1"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap/keys"
"github.com/gardener/gardener/pkg/controllermanager/apis/config"
"github.com/gardener/gardener/pkg/controllerutils"
kutils "github.com/gardener/gardener/pkg/utils/kubernetes"
)
// Controller controls ManagedSeedSets.
type Controller struct {
gardenClient kubernetes.Interface
reconciler reconcile.Reconciler
managedSeedSetInformer runtimecache.Informer
shootInformer runtimecache.Informer
managedSeedInformer runtimecache.Informer
seedInformer runtimecache.Informer
managedSeedSetQueue workqueue.RateLimitingInterface
numberOfRunningWorkers int
workerCh chan int
logger *logrus.Logger
}
// NewManagedSeedSetController creates a new Gardener controller for ManagedSeedSets.
func NewManagedSeedSetController(
ctx context.Context,
clientMap clientmap.ClientMap,
config *config.ControllerManagerConfiguration,
recorder record.EventRecorder,
logger *logrus.Logger,
) (*Controller, error) {
gardenClient, err := clientMap.GetClient(ctx, keys.ForGarden())
if err != nil {
return nil, fmt.Errorf("could not get garden client: %w", err)
}
managedSeedSetInformer, err := gardenClient.Cache().GetInformer(ctx, &seedmanagementv1alpha1.ManagedSeedSet{})
if err != nil {
return nil, fmt.Errorf("could not get ManagedSeedSet informer: %w", err)
}
shootInformer, err := gardenClient.Cache().GetInformer(ctx, &gardencorev1beta1.Shoot{})
if err != nil {
return nil, fmt.Errorf("could not get Shoot informer: %w", err)
}
managedSeedInformer, err := gardenClient.Cache().GetInformer(ctx, &seedmanagementv1alpha1.ManagedSeed{})
if err != nil {
return nil, fmt.Errorf("could not get ManagedSeed informer: %w", err)
}
seedInformer, err := gardenClient.Cache().GetInformer(ctx, &gardencorev1beta1.Seed{})
if err != nil {
return nil, fmt.Errorf("could not get Seed informer: %w", err)
}
replicaFactory := ReplicaFactoryFunc(NewReplica)
replicaGetter := NewReplicaGetter(gardenClient, replicaFactory)
actuator := NewActuator(gardenClient, replicaGetter, replicaFactory, config.Controllers.ManagedSeedSet, recorder, logger)
reconciler := NewReconciler(gardenClient, actuator, config.Controllers.ManagedSeedSet, logger)
return &Controller{
gardenClient: gardenClient,
reconciler: reconciler,
managedSeedSetInformer: managedSeedSetInformer,
shootInformer: shootInformer,
managedSeedInformer: managedSeedInformer,
seedInformer: seedInformer,
managedSeedSetQueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "ManagedSeedSet"),
workerCh: make(chan int),
logger: logger,
}, nil
}
// Run runs the Controller until the given context is cancelled.
func (c *Controller) Run(ctx context.Context, workers int) {
var waitGroup sync.WaitGroup
c.managedSeedSetInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: c.managedSeedSetAdd,
UpdateFunc: c.managedSeedSetUpdate,
DeleteFunc: c.managedSeedSetDelete,
})
// Add event handler for controlled shoots
c.shootInformer.AddEventHandler(&kutils.ControlledResourceEventHandler{
ControllerTypes: []kutils.ControllerType{
{Type: &seedmanagementv1alpha1.ManagedSeedSet{}},
},
Ctx: ctx,
Reader: c.gardenClient.Cache(),
ControllerPredicateFactory: kutils.ControllerPredicateFactoryFunc(c.filterShoot),
Enqueuer: kutils.EnqueuerFunc(func(obj client.Object) { c.managedSeedSetAdd(obj) }),
Scheme: kubernetes.GardenScheme,
Logger: c.logger,
})
// Add event handler for controlled managed seeds
c.managedSeedInformer.AddEventHandler(&kutils.ControlledResourceEventHandler{
ControllerTypes: []kutils.ControllerType{
{Type: &seedmanagementv1alpha1.ManagedSeedSet{}},
},
Ctx: ctx,
Reader: c.gardenClient.Cache(),
ControllerPredicateFactory: kutils.ControllerPredicateFactoryFunc(c.filterManagedSeed),
Enqueuer: kutils.EnqueuerFunc(func(obj client.Object) { c.managedSeedSetAdd(obj) }),
Scheme: kubernetes.GardenScheme,
Logger: c.logger,
})
// Add event handler for controlled seeds
c.seedInformer.AddEventHandler(&kutils.ControlledResourceEventHandler{
ControllerTypes: []kutils.ControllerType{
{
Type: &seedmanagementv1alpha1.ManagedSeed{},
Namespace: pointer.String(gardencorev1beta1constants.GardenNamespace),
NameFunc: func(obj client.Object) string { return obj.GetName() },
},
{Type: &seedmanagementv1alpha1.ManagedSeedSet{}},
},
Ctx: ctx,
Reader: c.gardenClient.Cache(),
ControllerPredicateFactory: kutils.ControllerPredicateFactoryFunc(c.filterSeed),
Enqueuer: kutils.EnqueuerFunc(func(obj client.Object) { c.managedSeedSetAdd(obj) }),
Scheme: kubernetes.GardenScheme,
Logger: c.logger,
})
if !cache.WaitForCacheSync(ctx.Done(), c.managedSeedSetInformer.HasSynced, c.shootInformer.HasSynced, c.managedSeedInformer.HasSynced, c.seedInformer.HasSynced) {
c.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
c.logger.Debugf("Current number of running ManagedSeedSet workers is %d", c.numberOfRunningWorkers)
}
}()
c.logger.Info("ManagedSeedSet controller initialized.")
for i := 0; i < workers; i++ {
controllerutils.CreateWorker(ctx, c.managedSeedSetQueue, "ManagedSeedSet", c.reconciler, &waitGroup, c.workerCh)
}
// Shutdown handling
<-ctx.Done()
c.managedSeedSetQueue.ShutDown()
for {
if c.managedSeedSetQueue.Len() == 0 && c.numberOfRunningWorkers == 0 {
c.logger.Debug("No running ManagedSeedSet worker and no items left in the queues. Terminated ManagedSeedSet controller...")
break
}
c.logger.Debugf("Waiting for %d ManagedSeedSet worker(s) to finish (%d item(s) left in the queues)...", c.numberOfRunningWorkers, c.managedSeedSetQueue.Len())
time.Sleep(5 * time.Second)
}
waitGroup.Wait()
}