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seed_control.go
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seed_control.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 federatedseed
import (
"context"
"fmt"
"sync"
"github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
kubeinformers "k8s.io/client-go/informers"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/workqueue"
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"
"github.com/gardener/gardener/pkg/apis/core/v1beta1/helper"
"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/gardenlet/controller/federatedseed/extensions"
seedapiservernetworkpolicy "github.com/gardener/gardener/pkg/gardenlet/controller/federatedseed/networkpolicy"
"github.com/gardener/gardener/pkg/logger"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
)
// Controller is responsible for maintaining multiple federated Seeds' controllers
type Controller struct {
federatedSeedControllerManager *federatedSeedControllerManager
clientMap clientmap.ClientMap
config *config.GardenletConfiguration
gardenClient client.Client
seedInformer runtimecache.Informer
seedQueue workqueue.RateLimitingInterface
recorder record.EventRecorder
numberOfRunningWorkers int
workerCh chan int
lock sync.RWMutex
}
// NewFederatedSeedController creates new controller that reconciles extension resources.
func NewFederatedSeedController(ctx context.Context, clientMap clientmap.ClientMap, 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, err
}
controller := &Controller{
clientMap: clientMap,
gardenClient: gardenClient.Client(),
seedInformer: seedInformer,
seedQueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "seed-controllers"),
config: config,
workerCh: make(chan int),
recorder: recorder,
}
controller.federatedSeedControllerManager = &federatedSeedControllerManager{
clientMap: clientMap,
extensionControllers: make(map[string]*extensionsController),
namespaceControllers: make(map[string]*namespaceController),
}
return controller, nil
}
func (c *Controller) seedAdd(obj interface{}) {
seedObj := obj.(*gardencorev1beta1.Seed)
bootstrappedCondition := helper.GetCondition(seedObj.Status.Conditions, gardencorev1beta1.SeedBootstrapped)
if bootstrappedCondition == nil || bootstrappedCondition.Status != gardencorev1beta1.ConditionTrue {
return
}
c.addSeedToQueue(obj)
}
func (c *Controller) addSeedToQueue(obj interface{}) {
key, err := cache.MetaNamespaceKeyFunc(obj)
if err != nil {
return
}
c.seedQueue.Add(key)
}
func (c *Controller) seedUpdate(_, newObj interface{}) {
var newSeedObj = newObj.(*gardencorev1beta1.Seed)
newSeedBootstrappedCondition := helper.GetCondition(newSeedObj.Status.Conditions, gardencorev1beta1.SeedBootstrapped)
c.lock.Lock()
defer c.lock.Unlock()
_, found := c.federatedSeedControllerManager.extensionControllers[newSeedObj.Name]
if !found && newSeedBootstrappedCondition != nil && newSeedBootstrappedCondition.Status == gardencorev1beta1.ConditionTrue {
c.addSeedToQueue(newSeedObj)
}
}
func (c *Controller) seedDelete(obj interface{}) {
seed := obj.(*gardencorev1beta1.Seed)
c.federatedSeedControllerManager.removeController(seed.GetName())
}
// Run starts the FederatedSeed Controller
func (c *Controller) Run(ctx context.Context, workers int) {
c.seedInformer.AddEventHandler(cache.FilteringResourceEventHandler{
FilterFunc: controllerutils.SeedFilterFunc(confighelper.SeedNameFromSeedConfig(c.config.SeedConfig), c.config.SeedSelector),
Handler: cache.ResourceEventHandlerFuncs{
AddFunc: c.seedAdd,
UpdateFunc: c.seedUpdate,
DeleteFunc: c.seedDelete,
},
})
var waitGroup sync.WaitGroup
if !cache.WaitForCacheSync(ctx.Done(), c.seedInformer.HasSynced) {
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 Federated controller workers is %d", c.numberOfRunningWorkers)
}
}()
logger.Logger.Infof("Starting federated controllers")
for i := 0; i < workers; i++ {
controllerutils.CreateWorker(ctx, c.seedQueue, "Seed", reconcile.Func(c.reconcileSeedRequest), &waitGroup, c.workerCh)
}
<-ctx.Done()
logger.Logger.Infof("Shutting down federated controllers")
c.federatedSeedControllerManager.ShutDownControllers()
c.seedQueue.ShutDown()
waitGroup.Wait()
}
func (c *Controller) reconcileSeedRequest(ctx context.Context, req reconcile.Request) (reconcile.Result, error) {
seed := &gardencorev1beta1.Seed{}
if err := c.gardenClient.Get(ctx, kutil.Key(req.Name), seed); err != nil {
if apierrors.IsNotFound(err) {
logger.Logger.Infof("Skipping federated seed setup - Seed %s was not found", req.Name)
return reconcile.Result{}, nil
}
return reconcile.Result{}, err
}
if seed.DeletionTimestamp != nil {
logger.Logger.Infof("Skipping federated seed setup - Seed %s is being deleted", req.Name)
return reconcile.Result{}, nil
}
condition := helper.GetCondition(seed.Status.Conditions, gardencorev1beta1.SeedBootstrapped)
if condition.Status != gardencorev1beta1.ConditionTrue {
return reconcile.Result{}, nil
}
seedLogger := logger.Logger.WithField("Seed", seed.GetName())
if err := c.federatedSeedControllerManager.createExtensionControllers(ctx, seedLogger, seed.GetName(), c.clientMap, c.config, c.recorder); err != nil {
return reconcile.Result{}, err
}
if err := c.federatedSeedControllerManager.createNamespaceControllers(ctx, seedLogger, seed.GetName(), c.clientMap, c.config, c.recorder); err != nil {
return reconcile.Result{}, err
}
return reconcile.Result{}, nil
}
type federatedSeedControllerManager struct {
clientMap clientmap.ClientMap
extensionControllers map[string]*extensionsController
namespaceControllers map[string]*namespaceController
extensionControllersLock sync.RWMutex
namespaceControllersLock sync.RWMutex
}
type extensionsController struct {
controller *extensions.Controller
cancelFunc context.CancelFunc
}
func (s *extensionsController) Stop() {
s.cancelFunc()
s.controller.Stop()
}
type namespaceController struct {
controller *seedapiservernetworkpolicy.Controller
cancelFunc context.CancelFunc
}
func (s *namespaceController) Stop() {
logger.Logger.Infof("Stopping extension controller")
s.cancelFunc()
s.controller.Stop()
}
func (f *federatedSeedControllerManager) createExtensionControllers(ctx context.Context, seedLogger *logrus.Entry, seedName string, clientMap clientmap.ClientMap, config *config.GardenletConfiguration, recorder record.EventRecorder) error {
f.extensionControllersLock.Lock()
if _, found := f.extensionControllers[seedName]; found {
f.extensionControllersLock.Unlock()
logger.Logger.Debugf("Extension controllers are already started for seed %s", seedName)
return nil
}
f.extensionControllersLock.Unlock()
gardenClient, err := clientMap.GetClient(ctx, keys.ForGarden())
if err != nil {
return fmt.Errorf("failed to get garden client: %w", err)
}
seedClient, err := clientMap.GetClient(ctx, keys.ForSeedWithName(seedName))
if err != nil {
return fmt.Errorf("failed to get seed client: %w", err)
}
extensionsController, err := extensions.NewController(ctx, gardenClient, seedClient, seedName, seedLogger, recorder)
if err != nil {
return err
}
extensionCtx, extensionCancelFunc := context.WithCancel(ctx)
seedLogger.Info("Run extensions controller")
if err := extensionsController.Run(extensionCtx, *config.Controllers.ControllerInstallationRequired.ConcurrentSyncs, *config.Controllers.ShootStateSync.ConcurrentSyncs); err != nil {
seedLogger.Infof("There was an error running the extension controllers: %v", err)
extensionCancelFunc()
return err
}
f.addExtensionController(seedName, extensionsController, extensionCancelFunc)
return nil
}
func (f *federatedSeedControllerManager) createNamespaceControllers(ctx context.Context, seedLogger *logrus.Entry, seedName string, clientMap clientmap.ClientMap, config *config.GardenletConfiguration, recorder record.EventRecorder) error {
f.namespaceControllersLock.Lock()
if _, found := f.namespaceControllers[seedName]; found {
f.namespaceControllersLock.Unlock()
logger.Logger.Debugf("Namespace controllers are already started for seed %s", seedName)
return nil
}
f.namespaceControllersLock.Unlock()
seedClient, err := clientMap.GetClient(ctx, keys.ForSeedWithName(seedName))
if err != nil {
return fmt.Errorf("failed to get seed client: %w", err)
}
// if another controller also needs to work with endpoint resources in the Seed cluster, consider replacing this informer factory with a reusable informer factory.
// if this informer factory is not bound to the default namespace, make sure that the endpoint event handlers FilterFunc() also filters for the default namespace.
seedDefaultNamespaceKubeInformer := kubeinformers.NewSharedInformerFactoryWithOptions(seedClient.Kubernetes(), 0, kubeinformers.WithNamespace(corev1.NamespaceDefault))
namespaceController, err := seedapiservernetworkpolicy.NewController(ctx, seedClient, seedDefaultNamespaceKubeInformer, seedLogger, recorder, seedName)
if err != nil {
return err
}
seedLogger.Info("Run namespace controller")
namespaceCtx, namespaceCancelFunc := context.WithCancel(ctx)
if err := namespaceController.Run(namespaceCtx, *config.Controllers.SeedAPIServerNetworkPolicy.ConcurrentSyncs); err != nil {
seedLogger.Infof("There was an error running the namespace controller: %v", err)
namespaceCancelFunc()
return err
}
f.addNamespaceController(seedName, namespaceController, namespaceCancelFunc)
return nil
}
func (f *federatedSeedControllerManager) addExtensionController(seedName string, controller *extensions.Controller, cancelFunc context.CancelFunc) {
logger.Logger.Debugf("Adding extension controllers for seed %s", seedName)
f.extensionControllersLock.Lock()
defer f.extensionControllersLock.Unlock()
f.extensionControllers[seedName] = &extensionsController{
controller: controller,
cancelFunc: cancelFunc,
}
}
func (f *federatedSeedControllerManager) addNamespaceController(seedName string, controller *seedapiservernetworkpolicy.Controller, cancelFunc context.CancelFunc) {
logger.Logger.Debugf("Adding namespace controller for seed %s", seedName)
f.namespaceControllersLock.Lock()
defer f.namespaceControllersLock.Unlock()
f.namespaceControllers[seedName] = &namespaceController{
controller: controller,
cancelFunc: cancelFunc,
}
}
func (f *federatedSeedControllerManager) removeController(seedName string) {
if controller, ok := f.extensionControllers[seedName]; ok {
logger.Logger.Debugf("Removing extension controller for seed %s", seedName)
controller.Stop()
f.extensionControllersLock.Lock()
defer f.extensionControllersLock.Unlock()
delete(f.extensionControllers, seedName)
}
if controller, ok := f.namespaceControllers[seedName]; ok {
logger.Logger.Debugf("Removing namespace controller for seed %s", seedName)
controller.Stop()
f.namespaceControllersLock.Lock()
defer f.namespaceControllersLock.Unlock()
delete(f.namespaceControllers, seedName)
}
if err := f.clientMap.InvalidateClient(keys.ForSeedWithName(seedName)); err != nil {
logger.Logger.Errorf("Failed to invalidate seed client: %v", err)
}
}
func (f *federatedSeedControllerManager) ShutDownControllers() {
logger.Logger.Infof("Federated controllers are being stopped")
for _, controller := range f.extensionControllers {
controller.Stop()
}
for _, controller := range f.namespaceControllers {
controller.Stop()
}
}