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add.go
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// Copyright (c) 2022 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"
"github.com/go-logr/logr"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/util/workqueue"
"k8s.io/utils/pointer"
"sigs.k8s.io/controller-runtime/pkg/builder"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/cluster"
"sigs.k8s.io/controller-runtime/pkg/controller"
"sigs.k8s.io/controller-runtime/pkg/event"
"sigs.k8s.io/controller-runtime/pkg/handler"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/predicate"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
"github.com/gardener/gardener/charts"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
seedmanagementv1alpha1 "github.com/gardener/gardener/pkg/apis/seedmanagement/v1alpha1"
"github.com/gardener/gardener/pkg/controllerutils/mapper"
"github.com/gardener/gardener/pkg/utils"
contextutil "github.com/gardener/gardener/pkg/utils/context"
gutil "github.com/gardener/gardener/pkg/utils/gardener"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
)
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"
)
// AddToManager adds Reconciler to the given manager.
func (r *Reconciler) AddToManager(
mgr manager.Manager,
gardenCluster cluster.Cluster,
seedCluster cluster.Cluster,
) error {
if r.GardenClient == nil {
r.GardenClient = gardenCluster.GetClient()
}
if r.GardenNamespaceGarden == "" {
r.GardenNamespaceGarden = v1beta1constants.GardenNamespace
}
if r.GardenNamespaceShoot == "" {
r.GardenNamespaceShoot = v1beta1constants.GardenNamespace
}
if r.ChartsPath == "" {
r.ChartsPath = charts.Path
}
if r.Actuator == nil {
r.Actuator = newActuator(
gardenCluster.GetConfig(),
gardenCluster.GetAPIReader(),
gardenCluster.GetClient(),
seedCluster.GetClient(),
r.ShootClientMap,
NewValuesHelper(&r.Config, r.ImageVector),
gardenCluster.GetEventRecorderFor(ControllerName+"-controller"),
r.ChartsPath,
r.GardenNamespaceShoot,
)
}
c, err := builder.
ControllerManagedBy(mgr).
Named(ControllerName).
WithOptions(controller.Options{
MaxConcurrentReconciles: pointer.IntDeref(r.Config.Controllers.ManagedSeed.ConcurrentSyncs, 0),
}).
Build(r)
if err != nil {
return err
}
if err := c.Watch(
source.NewKindWithCache(&seedmanagementv1alpha1.ManagedSeed{}, gardenCluster.GetCache()),
r.EnqueueWithJitterDelay(),
r.ManagedSeedPredicate(r.Config.SeedConfig.SeedTemplate.Name),
&predicate.GenerationChangedPredicate{},
); err != nil {
return err
}
return c.Watch(
source.NewKindWithCache(&gardencorev1beta1.Seed{}, gardenCluster.GetCache()),
mapper.EnqueueRequestsFrom(mapper.MapFunc(r.MapSeedToManagedSeed), mapper.UpdateWithNew, c.GetLogger()),
r.SeedOfManagedSeedPredicate(r.Config.SeedConfig.SeedTemplate.Name),
)
}
// ManagedSeedPredicate returns the predicate for ManagedSeed events.
func (r *Reconciler) ManagedSeedPredicate(seedName string) predicate.Predicate {
return &managedSeedPredicate{
reader: r.GardenClient,
gardenNamespace: r.GardenNamespaceGarden,
seedName: seedName,
}
}
type managedSeedPredicate struct {
ctx context.Context
reader client.Reader
gardenNamespace string
seedName string
}
func (p *managedSeedPredicate) InjectStopChannel(stopChan <-chan struct{}) error {
p.ctx = contextutil.FromStopChannel(stopChan)
return nil
}
func (p *managedSeedPredicate) Create(e event.CreateEvent) bool {
return p.filterManagedSeed(e.Object)
}
func (p *managedSeedPredicate) Update(e event.UpdateEvent) bool {
return p.filterManagedSeed(e.ObjectNew)
}
func (p *managedSeedPredicate) Delete(e event.DeleteEvent) bool {
return p.filterManagedSeed(e.Object)
}
func (p *managedSeedPredicate) Generic(_ event.GenericEvent) bool { return false }
// filterManagedSeed is filtering func for ManagedSeeds that checks if the ManagedSeed references a Shoot scheduled on a Seed,
// for which the gardenlet is responsible.
func (p *managedSeedPredicate) filterManagedSeed(obj client.Object) bool {
managedSeed, ok := obj.(*seedmanagementv1alpha1.ManagedSeed)
if !ok {
return false
}
return filterManagedSeed(p.ctx, p.reader, managedSeed, p.gardenNamespace, p.seedName)
}
// SeedOfManagedSeedPredicate returns the predicate for Seed events.
func (r *Reconciler) SeedOfManagedSeedPredicate(seedName string) predicate.Predicate {
return &seedOfManagedSeedPredicate{
reader: r.GardenClient,
gardenNamespace: r.GardenNamespaceGarden,
seedName: seedName,
}
}
type seedOfManagedSeedPredicate struct {
ctx context.Context
reader client.Reader
gardenNamespace string
seedName string
}
func (p *seedOfManagedSeedPredicate) InjectStopChannel(stopChan <-chan struct{}) error {
p.ctx = contextutil.FromStopChannel(stopChan)
return nil
}
func (p *seedOfManagedSeedPredicate) Create(e event.CreateEvent) bool {
return p.filterSeedOfManagedSeed(e.Object)
}
func (p *seedOfManagedSeedPredicate) Update(e event.UpdateEvent) bool {
return p.filterSeedOfManagedSeed(e.ObjectNew)
}
func (p *seedOfManagedSeedPredicate) Delete(e event.DeleteEvent) bool {
return p.filterSeedOfManagedSeed(e.Object)
}
func (p *seedOfManagedSeedPredicate) Generic(_ event.GenericEvent) bool { return false }
// filterSeedOfManagedSeed is filtering func for Seeds that checks if the Seed is owned by a ManagedSeed that references a Shoot
// scheduled on a Seed, for which the gardenlet is responsible.
func (p *seedOfManagedSeedPredicate) filterSeedOfManagedSeed(obj client.Object) bool {
seed, ok := obj.(*gardencorev1beta1.Seed)
if !ok {
return false
}
managedSeed := &seedmanagementv1alpha1.ManagedSeed{}
if err := p.reader.Get(p.ctx, kutil.Key(p.gardenNamespace, seed.Name), managedSeed); err != nil {
return false
}
return filterManagedSeed(p.ctx, p.reader, managedSeed, p.gardenNamespace, p.seedName)
}
func filterManagedSeed(ctx context.Context, reader client.Reader, managedSeed *seedmanagementv1alpha1.ManagedSeed, gardenNamespace, seedName string) bool {
if managedSeed.Spec.Shoot == nil || managedSeed.Spec.Shoot.Name == "" {
return false
}
shoot := &gardencorev1beta1.Shoot{}
if err := reader.Get(ctx, kutil.Key(managedSeed.Namespace, managedSeed.Spec.Shoot.Name), shoot); err != nil {
return false
}
specSeedName, statusSeedName := gutil.GetShootSeedNames(shoot)
return gutil.GetResponsibleSeedName(specSeedName, statusSeedName) == seedName
}
// MapSeedToManagedSeed is a mapper.MapFunc for mapping a Seed to the owning ManagedSeed.
func (r *Reconciler) MapSeedToManagedSeed(_ context.Context, _ logr.Logger, _ client.Reader, obj client.Object) []reconcile.Request {
return []reconcile.Request{{NamespacedName: types.NamespacedName{Namespace: r.GardenNamespaceGarden, Name: obj.GetName()}}}
}
func reconcileRequest(obj client.Object) reconcile.Request {
return reconcile.Request{NamespacedName: types.NamespacedName{
Name: obj.GetName(),
Namespace: obj.GetNamespace(),
}}
}
// RandomDurationWithMetaDuration is an alias for `utils.RandomDurationWithMetaDuration`. Exposed for unit tests.
var RandomDurationWithMetaDuration = utils.RandomDurationWithMetaDuration
// EnqueueWithJitterDelay returns handler.Funcs which enqueues the object with a random Jitter duration when the JitterUpdate
// is enabled in ManagedSeed controller configuration.
// All other events are normally enqueued.
func (r *Reconciler) EnqueueWithJitterDelay() handler.EventHandler {
return &handler.Funcs{
CreateFunc: func(evt event.CreateEvent, q workqueue.RateLimitingInterface) {
managedSeed, ok := evt.Object.(*seedmanagementv1alpha1.ManagedSeed)
if !ok {
return
}
generationChanged := managedSeed.Generation != managedSeed.Status.ObservedGeneration
// Managed seed with deletion timestamp and newly created managed seed will be enqueued immediately.
// Generation is 1 for newly created objects.
if managedSeed.DeletionTimestamp != nil || managedSeed.Generation == 1 {
q.Add(reconcileRequest(evt.Object))
return
}
if generationChanged {
if *r.Config.Controllers.ManagedSeed.JitterUpdates {
q.AddAfter(reconcileRequest(evt.Object), RandomDurationWithMetaDuration(r.Config.Controllers.ManagedSeed.SyncJitterPeriod))
} else {
q.Add(reconcileRequest(evt.Object))
}
return
}
// Spread reconciliation of managed seeds (including gardenlet updates/rollouts) across the configured sync jitter
// period to avoid overloading the gardener-apiserver if all gardenlets in all managed seeds are (re)starting
// roughly at the same time.
q.AddAfter(reconcileRequest(evt.Object), RandomDurationWithMetaDuration(r.Config.Controllers.ManagedSeed.SyncJitterPeriod))
},
UpdateFunc: func(evt event.UpdateEvent, q workqueue.RateLimitingInterface) {
managedSeed, ok := evt.ObjectNew.(*seedmanagementv1alpha1.ManagedSeed)
if !ok {
return
}
if managedSeed.Generation == managedSeed.Status.ObservedGeneration {
return
}
// Managed seed with deletion timestamp and newly created managed seed will be enqueued immediately.
// Generation is 1 for newly created objects.
if managedSeed.DeletionTimestamp != nil || managedSeed.Generation == 1 {
q.Add(reconcileRequest(evt.ObjectNew))
return
}
if *r.Config.Controllers.ManagedSeed.JitterUpdates {
q.AddAfter(reconcileRequest(evt.ObjectNew), RandomDurationWithMetaDuration(r.Config.Controllers.ManagedSeed.SyncJitterPeriod))
} else {
q.Add(reconcileRequest(evt.ObjectNew))
}
},
DeleteFunc: func(evt event.DeleteEvent, q workqueue.RateLimitingInterface) {
if evt.Object == nil {
return
}
q.Add(reconcileRequest(evt.Object))
},
}
}