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plant.go
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plant.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"
"time"
"github.com/go-logr/logr"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
"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/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"
)
const (
// FinalizerName is the name of the Plant finalizer.
FinalizerName = "core.gardener.cloud/plant"
// ControllerName is the name of this controller.
ControllerName = "plant"
)
// Controller controls Plant.
type Controller struct {
gardenClient client.Client
log logr.Logger
reconciler reconcile.Reconciler
hasSyncedFuncs []cache.InformerSynced
plantQueue workqueue.RateLimitingInterface
workerCh chan int
numberOfRunningWorkers int
}
// NewController instantiates a new Plant controller.
func NewController(
ctx context.Context,
log logr.Logger,
clientMap clientmap.ClientMap,
config *config.ControllerManagerConfiguration,
) (
*Controller,
error,
) {
log = log.WithName(ControllerName)
gardenClient, err := clientMap.GetClient(ctx, keys.ForGarden())
if err != nil {
return nil, err
}
plantInformer, err := gardenClient.Cache().GetInformer(ctx, &gardencorev1beta1.Plant{})
if err != nil {
return nil, fmt.Errorf("failed to get Plant Informer: %w", err)
}
secretInformer, err := gardenClient.Cache().GetInformer(ctx, &corev1.Secret{})
if err != nil {
return nil, fmt.Errorf("failed to get Secret Informer: %w", err)
}
controller := &Controller{
gardenClient: gardenClient.Client(),
log: log,
reconciler: NewPlantReconciler(clientMap, gardenClient.Client(), config.Controllers.Plant),
plantQueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "plant"),
workerCh: make(chan int),
}
plantInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: controller.plantAdd,
UpdateFunc: controller.plantUpdate,
DeleteFunc: controller.plantDelete,
})
secretInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) { controller.reconcilePlantForMatchingSecret(ctx, obj) },
UpdateFunc: func(oldObj, newObj interface{}) { controller.plantSecretUpdate(ctx, oldObj, newObj) },
DeleteFunc: func(obj interface{}) { controller.reconcilePlantForMatchingSecret(ctx, obj) },
})
controller.hasSyncedFuncs = append(controller.hasSyncedFuncs, plantInformer.HasSynced, secretInformer.HasSynced)
return controller, nil
}
// Run runs the Controller until the given stop channel can be read from.
func (c *Controller) Run(ctx context.Context, workers int) {
var waitGroup sync.WaitGroup
if !cache.WaitForCacheSync(ctx.Done(), c.hasSyncedFuncs...) {
c.log.Error(wait.ErrWaitTimeout, "Timed out waiting for caches to sync")
return
}
go func() {
for res := range c.workerCh {
c.numberOfRunningWorkers += res
}
}()
c.log.Info("Plant controller initialized")
for i := 0; i < workers; i++ {
controllerutils.CreateWorker(ctx, c.plantQueue, "Plant", c.reconciler, &waitGroup, c.workerCh, controllerutils.WithLogger(c.log))
}
// Shutdown handling
<-ctx.Done()
c.plantQueue.ShutDown()
for {
if c.plantQueue.Len() == 0 && c.numberOfRunningWorkers == 0 {
c.log.V(1).Info("No running Plant worker and no items left in the queues. Terminating Plant controller")
break
}
c.log.V(1).Info("Waiting for Plant workers to finish", "numberOfRunningWorkers", c.numberOfRunningWorkers, "queueLength", c.plantQueue.Len())
time.Sleep(5 * time.Second)
}
waitGroup.Wait()
}