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managedseed.go
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managedseed.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 managedseed
import (
"context"
"fmt"
"sync"
"time"
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/controllerutils"
"github.com/gardener/gardener/pkg/gardenlet/apis/config"
confighelper "github.com/gardener/gardener/pkg/gardenlet/apis/config/helper"
"github.com/gardener/gardener/pkg/utils/imagevector"
kutils "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/go-logr/logr"
"k8s.io/apimachinery/pkg/util/wait"
"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"
)
const (
// ControllerName is the name of this controller.
ControllerName = "managedseed"
// GardenletDefaultKubeconfigSecretName is the default name for the field in the Gardenlet component configuration
// .gardenClientConnection.KubeconfigSecret.Name
GardenletDefaultKubeconfigSecretName = "gardenlet-kubeconfig"
// GardenletDefaultKubeconfigBootstrapSecretName is the default name for the field in the Gardenlet component configuration
// .gardenClientConnection.BootstrapKubeconfig.Name
GardenletDefaultKubeconfigBootstrapSecretName = "gardenlet-kubeconfig-bootstrap"
)
// Controller controls ManagedSeeds.
type Controller struct {
log logr.Logger
gardenClient kubernetes.Interface
config *config.GardenletConfiguration
reconciler reconcile.Reconciler
managedSeedInformer runtimecache.Informer
seedInformer runtimecache.Informer
managedSeedQueue workqueue.RateLimitingInterface
numberOfRunningWorkers int
workerCh chan int
}
// NewManagedSeedController creates a new Gardener controller for ManagedSeeds.
func NewManagedSeedController(
ctx context.Context,
log logr.Logger,
clientMap clientmap.ClientMap,
config *config.GardenletConfiguration,
imageVector imagevector.ImageVector,
recorder record.EventRecorder,
) (
*Controller,
error,
) {
log = log.WithName(ControllerName)
gardenClient, err := clientMap.GetClient(ctx, keys.ForGarden())
if err != nil {
return nil, fmt.Errorf("could not get garden client: %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)
}
var (
valuesHelper = NewValuesHelper(config, imageVector)
actuator = newActuator(gardenClient, clientMap, valuesHelper, recorder)
)
return &Controller{
log: log,
gardenClient: gardenClient,
config: config,
reconciler: newReconciler(gardenClient, actuator, config.Controllers.ManagedSeed),
managedSeedInformer: managedSeedInformer,
seedInformer: seedInformer,
managedSeedQueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "ManagedSeed"),
workerCh: make(chan int),
}, 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.managedSeedInformer.AddEventHandler(cache.FilteringResourceEventHandler{
FilterFunc: controllerutils.ManagedSeedFilterFunc(ctx, c.gardenClient.Cache(), confighelper.SeedNameFromSeedConfig(c.config.SeedConfig)),
Handler: cache.ResourceEventHandlerFuncs{
AddFunc: c.managedSeedAdd,
UpdateFunc: c.managedSeedUpdate,
DeleteFunc: c.managedSeedDelete,
},
})
// Add event handler for controlled seeds
c.seedInformer.AddEventHandler(cache.FilteringResourceEventHandler{
FilterFunc: controllerutils.SeedOfManagedSeedFilterFunc(ctx, c.gardenClient.Cache(), confighelper.SeedNameFromSeedConfig(c.config.SeedConfig)),
Handler: &kutils.ControlledResourceEventHandler{
ControllerTypes: []kutils.ControllerType{
{
Type: &seedmanagementv1alpha1.ManagedSeed{},
Namespace: pointer.String(gardencorev1beta1constants.GardenNamespace),
NameFunc: func(obj client.Object) string { return obj.GetName() },
},
},
Ctx: ctx,
Reader: c.gardenClient.Cache(),
ControllerPredicateFactory: kutils.ControllerPredicateFactoryFunc(c.filterSeed),
Enqueuer: kutils.EnqueuerFunc(func(obj client.Object) { c.managedSeedAdd(obj) }),
Scheme: kubernetes.GardenScheme,
Logger: c.log,
},
})
if !cache.WaitForCacheSync(ctx.Done(), c.managedSeedInformer.HasSynced, c.seedInformer.HasSynced) {
c.log.Error(wait.ErrWaitTimeout, "Timed out waiting for caches to sync")
return
}
// Count number of running workers
go func() {
for res := range c.workerCh {
c.numberOfRunningWorkers += res
}
}()
c.log.Info("ManagedSeed controller initialized")
for i := 0; i < workers; i++ {
controllerutils.CreateWorker(ctx, c.managedSeedQueue, "ManagedSeed", c.reconciler, &waitGroup, c.workerCh, controllerutils.WithLogger(c.log))
}
// Shutdown handling
<-ctx.Done()
c.managedSeedQueue.ShutDown()
for {
if c.managedSeedQueue.Len() == 0 && c.numberOfRunningWorkers == 0 {
c.log.V(1).Info("No running ManagedSeed worker and no items left in the queues. Terminated ManagedSeed controller")
break
}
c.log.V(1).Info("Waiting for ManagedSeed workers to finish", "numberOfRunningWorkers", c.numberOfRunningWorkers, "queueLength", c.managedSeedQueue.Len())
time.Sleep(5 * time.Second)
}
waitGroup.Wait()
}