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shoot_hibernation_control.go
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shoot_hibernation_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 shoot
import (
"fmt"
garden "github.com/gardener/gardener/pkg/client/garden/clientset/versioned"
"github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/sirupsen/logrus"
"k8s.io/apimachinery/pkg/api/equality"
"k8s.io/client-go/util/retry"
"reflect"
"time"
gardenv1beta1 "github.com/gardener/gardener/pkg/apis/garden/v1beta1"
gardenlogger "github.com/gardener/gardener/pkg/logger"
"github.com/robfig/cron"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/client-go/tools/cache"
)
func hibernationLogger(key string) logrus.FieldLogger {
return gardenlogger.Logger.WithFields(logrus.Fields{
"controller": "shoot-hibernation",
"key": key,
})
}
func getShootHibernationSchedules(shoot *gardenv1beta1.Shoot) []gardenv1beta1.HibernationSchedule {
hibernation := shoot.Spec.Hibernation
if hibernation == nil {
return nil
}
return hibernation.Schedules
}
func shootHasHibernationSchedules(shoot *gardenv1beta1.Shoot) bool {
return getShootHibernationSchedules(shoot) != nil
}
func (c *Controller) shootHibernationAdd(obj interface{}) {
if shootHasHibernationSchedules(obj.(*gardenv1beta1.Shoot)) {
key, err := cache.MetaNamespaceKeyFunc(obj)
if err != nil {
gardenlogger.Logger.Errorf("Couldn't get key for object %+v: %v", obj, err)
return
}
c.shootHibernationQueue.Add(key)
}
}
func (c *Controller) shootHibernationUpdate(oldObj, newObj interface{}) {
var (
oldShoot = oldObj.(*gardenv1beta1.Shoot)
newShoot = newObj.(*gardenv1beta1.Shoot)
oldSchedule = getShootHibernationSchedules(oldShoot)
newSchedule = getShootHibernationSchedules(newShoot)
)
if !reflect.DeepEqual(oldSchedule, newSchedule) {
key, err := cache.MetaNamespaceKeyFunc(newObj)
if err != nil {
gardenlogger.Logger.Errorf("Couldn't get key for object %+v: %v", newObj, err)
return
}
c.shootHibernationQueue.Add(key)
}
}
func (c *Controller) shootHibernationDelete(obj interface{}) {
if shootHasHibernationSchedules(obj.(*gardenv1beta1.Shoot)) {
key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
if err != nil {
gardenlogger.Logger.Errorf("Couldn't get key for object %+v: %v", obj, err)
return
}
c.shootHibernationQueue.Add(key)
}
}
func (c *Controller) deleteShootCron(logger logrus.FieldLogger, key string) {
if cr, ok := c.shootToHibernationCron[key]; ok {
cr.Stop()
logger.Debugf("Stopped cron")
}
delete(c.shootToHibernationCron, key)
logger.Debugf("Deleted cron")
}
func (c *Controller) reconcileShootHibernationKey(key string) error {
logger := hibernationLogger(key)
logger.Info("Shoot Hibernation")
namespace, name, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
return err
}
shoot, err := c.shootLister.Shoots(namespace).Get(name)
if apierrors.IsNotFound(err) {
c.deleteShootCron(logger, key)
logger.Debugf("Skipping because Shoot has been deleted", key)
return nil
}
if err != nil {
logger.Debugf("Unable to retrieve object from store: %v", key, err)
return err
}
if shoot.DeletionTimestamp != nil {
c.deleteShootCron(logger, key)
return nil
}
return c.reconcileShootHibernation(logger, key, shoot.DeepCopy())
}
func (c *Controller) shootHibernationJob(logger logrus.FieldLogger, client garden.Interface, target *gardenv1beta1.Shoot, enabled bool) cron.Job {
return cron.FuncJob(func() {
_, err := kubernetes.TryUpdateShootHibernation(client, retry.DefaultBackoff, target.ObjectMeta,
func(shoot *gardenv1beta1.Shoot) (*gardenv1beta1.Shoot, error) {
if shoot.Spec.Hibernation == nil || !equality.Semantic.DeepEqual(target.Spec.Hibernation.Schedules, shoot.Spec.Hibernation.Schedules) {
return nil, fmt.Errorf("shoot %s/%s hibernation schedule changed mid-air", shoot.Namespace, shoot.Name)
}
shoot.Spec.Hibernation.Enabled = enabled
return shoot, nil
})
if err != nil {
logger.Errorf("Could not set hibernation.enabled to %t: %+v", enabled, err)
return
}
logger.Debugf("Successfully set hibernation.enabled to %t", enabled)
})
}
func (c *Controller) reconcileShootHibernation(logger logrus.FieldLogger, key string, shoot *gardenv1beta1.Shoot) error {
var (
schedules = getShootHibernationSchedules(shoot)
client = c.k8sGardenClient.Garden()
)
c.deleteShootCron(logger, key)
if len(schedules) == 0 {
return nil
}
cr := cron.NewWithLocation(time.UTC)
for _, schedule := range schedules {
if schedule.Start != nil {
start, err := cron.ParseStandard(*schedule.Start)
if err != nil {
return err
}
cr.Schedule(start, c.shootHibernationJob(logger, client, shoot, true))
}
if schedule.End != nil {
end, err := cron.ParseStandard(*schedule.End)
if err != nil {
return err
}
cr.Schedule(end, c.shootHibernationJob(logger, client, shoot, false))
}
}
c.shootToHibernationCron[key] = cr
cr.Start()
logger.Debugf("Successfully started hibernation schedule")
return nil
}