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plant_control.go
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plant_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 plant
import (
"context"
"fmt"
"sync"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
gardencorev1beta1helper "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/controllermanager/apis/config"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/logger"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/labels"
kubecorev1listers "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/retry"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// reconcilePlantForMatchingSecret checks if there is a plant resource that references this secret and then reconciles the plant again
func (c *Controller) reconcilePlantForMatchingSecret(obj interface{}) {
secret, ok := obj.(*corev1.Secret)
if !ok {
logger.Logger.Errorf("Could not convert object %v into Secret", obj)
return
}
plants, err := c.plantLister.List(labels.Everything())
if err != nil {
logger.Logger.Errorf("Couldn't list plants for updated secret %+v: %v", obj, err)
return
}
for _, plant := range plants {
if isPlantSecret(plant, kutil.Key(secret.Namespace, secret.Name)) {
key, err := cache.MetaNamespaceKeyFunc(plant)
if err != nil {
logger.Logger.Errorf("Couldn't get key for plant %+v: %v", plant, err)
return
}
logger.Logger.Infof("[PLANT RECONCILE] Reconciling Plant after secret change")
c.plantQueue.Add(key)
return
}
}
}
// plantSecretUpdate calls reconcilePlantForMatchingSecret with the updated secret
func (c *Controller) plantSecretUpdate(oldObj, newObj interface{}) {
old, ok1 := oldObj.(*corev1.Secret)
new, ok2 := newObj.(*corev1.Secret)
if !ok1 || !ok2 {
return
}
if old.ResourceVersion != new.ResourceVersion {
c.reconcilePlantForMatchingSecret(newObj)
}
}
// plantAdd adds the plant resource
func (c *Controller) plantAdd(obj interface{}) {
key, err := cache.MetaNamespaceKeyFunc(obj)
if err != nil {
logger.Logger.Errorf("Couldn't get key for object %+v: %v", obj, err)
return
}
c.plantQueue.Add(key)
}
// plantUpdate updates the plant resource
func (c *Controller) plantUpdate(oldObj, newObj interface{}) {
old, ok1 := oldObj.(*gardencorev1beta1.Plant)
new, ok2 := newObj.(*gardencorev1beta1.Plant)
if !ok1 || !ok2 {
return
}
if new.ObjectMeta.Generation == old.ObjectMeta.Generation {
return
}
c.plantAdd(newObj)
}
func (c *Controller) plantDelete(obj interface{}) {
key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
if err != nil {
logger.Logger.Errorf("Couldn't get key for object %+v: %v", obj, err)
return
}
c.plantQueue.Add(key)
}
func (c *Controller) reconcilePlantKey(ctx context.Context, key string) error {
namespace, name, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
return err
}
plant, err := c.plantLister.Plants(namespace).Get(name)
if apierrors.IsNotFound(err) {
logger.Logger.Debugf("[PLANT RECONCILE] %s - skipping because Plant has been deleted", key)
return nil
}
if err != nil {
logger.Logger.Errorf("[PLANT RECONCILE] %s - unable to retrieve object from store: %v", key, err)
return err
}
if err := c.plantControl.Reconcile(ctx, plant); err != nil {
return err
}
c.plantQueue.AddAfter(key, c.config.Controllers.Plant.SyncPeriod.Duration)
return nil
}
// ControlInterface implements the control logic for updating Plants. It is implemented as an interface to allow
// for extensions that provide different semantics. Currently, there is only one implementation.
type ControlInterface interface {
Reconcile(context.Context, *gardencorev1beta1.Plant) error
}
// NewDefaultPlantControl returns a new instance of the default implementation ControlInterface that
// implements the documented semantics for Plants.
func NewDefaultPlantControl(clientMap clientmap.ClientMap, recorder record.EventRecorder, config *config.ControllerManagerConfiguration, secretLister kubecorev1listers.SecretLister) ControlInterface {
return &defaultPlantControl{
clientMap: clientMap,
secretsLister: secretLister,
recorder: recorder,
config: config,
}
}
func (c *defaultPlantControl) Reconcile(ctx context.Context, obj *gardencorev1beta1.Plant) error {
var (
plant = obj.DeepCopy()
logger = logger.NewFieldLogger(logger.Logger, "plant", plant.Name)
)
if plant.DeletionTimestamp != nil {
return c.delete(ctx, plant)
}
return c.reconcile(ctx, plant, logger)
}
func (c *defaultPlantControl) reconcile(ctx context.Context, plant *gardencorev1beta1.Plant, logger logrus.FieldLogger) error {
logger.Infof("[PLANT RECONCILE] %s", plant.Name)
gardenClient, err := c.clientMap.GetClient(ctx, keys.ForGarden())
if err != nil {
return fmt.Errorf("failed to get garden client: %w", err)
}
// Add Finalizers to Plant
if err := controllerutils.EnsureFinalizer(ctx, gardenClient.Client(), plant, FinalizerName); err != nil {
return fmt.Errorf("failed to ensure finalizer on plant: %w", err)
}
var (
conditionAPIServerAvailable = gardencorev1beta1helper.GetOrInitCondition(plant.Status.Conditions, gardencorev1beta1.PlantAPIServerAvailable)
conditionEveryNodeReady = gardencorev1beta1helper.GetOrInitCondition(plant.Status.Conditions, gardencorev1beta1.PlantEveryNodeReady)
)
kubeconfigSecret, err := c.secretsLister.Secrets(plant.Namespace).Get(plant.Spec.SecretRef.Name)
if err != nil {
if apierrors.IsNotFound(err) {
return updateStatusToUnknown(ctx, gardenClient.DirectClient(), plant, "Referenced Plant secret could not be found.", conditionAPIServerAvailable, conditionEveryNodeReady)
}
return fmt.Errorf("failed to get plant secret '%s/%s': %w", plant.Namespace, plant.Spec.SecretRef.Name, err)
}
if err := controllerutils.EnsureFinalizer(ctx, gardenClient.Client(), kubeconfigSecret, FinalizerName); err != nil {
return fmt.Errorf("failed to ensure finalizer on plant secret '%s/%s': %w", plant.Namespace, plant.Spec.SecretRef.Name, err)
}
plantClient, err := c.clientMap.GetClient(ctx, keys.ForPlant(plant))
if err != nil {
msg := fmt.Sprintf("failed to get plant client: %v", err)
logger.Error(msg)
return updateStatusToUnknown(ctx, gardenClient.DirectClient(), plant, msg, conditionAPIServerAvailable, conditionEveryNodeReady)
}
healthChecker := NewHealthChecker(plantClient.Client(), plantClient.Kubernetes().Discovery())
// Trigger health check
conditionAPIServerAvailable, conditionEveryNodeReady = c.healthChecks(ctx, healthChecker, conditionAPIServerAvailable, conditionEveryNodeReady)
cloudInfo, err := FetchCloudInfo(ctx, plantClient.Client(), plantClient.Kubernetes().Discovery(), logger)
if err != nil {
return fmt.Errorf("failed to fetch cloud info for plant: %w", err)
}
return updateStatus(ctx, gardenClient.DirectClient(), plant, cloudInfo, conditionAPIServerAvailable, conditionEveryNodeReady)
}
func updateStatusToUnknown(ctx context.Context, c client.Client, plant *gardencorev1beta1.Plant, message string, conditionAPIServerAvailable, conditionEveryNodeReady gardencorev1beta1.Condition) error {
conditionAPIServerAvailable = gardencorev1beta1helper.UpdatedCondition(conditionAPIServerAvailable, gardencorev1beta1.ConditionFalse, "APIServerDown", message)
conditionEveryNodeReady = gardencorev1beta1helper.UpdatedCondition(conditionEveryNodeReady, gardencorev1beta1.ConditionFalse, "Nodes not reachable", message)
return updateStatus(ctx, c, plant, &StatusCloudInfo{}, conditionAPIServerAvailable, conditionEveryNodeReady)
}
func updateStatus(ctx context.Context, c client.Client, plant *gardencorev1beta1.Plant, cloudInfo *StatusCloudInfo, conditions ...gardencorev1beta1.Condition) error {
return kutil.TryUpdateStatus(ctx, retry.DefaultBackoff, c, plant, func() error {
if plant.Status.ClusterInfo == nil {
plant.Status.ClusterInfo = &gardencorev1beta1.ClusterInfo{}
}
plant.Status.ClusterInfo.Cloud.Type = cloudInfo.CloudType
plant.Status.ClusterInfo.Cloud.Region = cloudInfo.Region
plant.Status.ClusterInfo.Kubernetes.Version = cloudInfo.K8sVersion
plant.Status.Conditions = conditions
return nil
})
}
func (c *defaultPlantControl) delete(ctx context.Context, plant *gardencorev1beta1.Plant) error {
gardenClient, err := c.clientMap.GetClient(ctx, keys.ForGarden())
if err != nil {
return fmt.Errorf("failed to get garden client: %w", err)
}
secret := &corev1.Secret{}
if err := gardenClient.Client().Get(ctx, kutil.Key(plant.Namespace, plant.Spec.SecretRef.Name), secret); client.IgnoreNotFound(err) != nil {
return fmt.Errorf("failed to get plant secret '%s/%s': %w", plant.Namespace, plant.Spec.SecretRef.Name, err)
}
if err := controllerutils.RemoveFinalizer(ctx, gardenClient.DirectClient(), secret, FinalizerName); err != nil {
return fmt.Errorf("failed to remove finalizer from plant secret '%s/%s': %w", plant.Namespace, plant.Spec.SecretRef.Name, err)
}
if err := controllerutils.RemoveFinalizer(ctx, gardenClient.DirectClient(), plant, FinalizerName); err != nil {
return fmt.Errorf("failed to remove finalizer from plant: %w", err)
}
if err := c.clientMap.InvalidateClient(keys.ForPlant(plant)); err != nil {
return fmt.Errorf("failed to invalidate plant client: %w", err)
}
return nil
}
func (c *defaultPlantControl) healthChecks(ctx context.Context, healthChecker *HealthChecker, apiserverAvailability, everyNodeReady gardencorev1beta1.Condition) (gardencorev1beta1.Condition, gardencorev1beta1.Condition) {
var wg sync.WaitGroup
wg.Add(2)
go func() {
defer wg.Done()
apiserverAvailability = healthChecker.CheckAPIServerAvailability(apiserverAvailability)
}()
go func() {
defer wg.Done()
everyNodeReady = healthChecker.CheckPlantClusterNodes(ctx, everyNodeReady)
}()
wg.Wait()
return apiserverAvailability, everyNodeReady
}