/
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"
"sync"
"time"
gardencoreinformers "github.com/gardener/gardener/pkg/client/core/informers/externalversions"
gardencorelisters "github.com/gardener/gardener/pkg/client/core/listers/core/v1beta1"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/controllermanager"
"github.com/gardener/gardener/pkg/controllermanager/apis/config"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/logger"
"github.com/prometheus/client_golang/prometheus"
kubeinformers "k8s.io/client-go/informers"
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/workqueue"
)
// FinalizerName is the name of the Plant finalizer.
const FinalizerName = "core.gardener.cloud/plant"
// Controller controls Plant.
type Controller struct {
k8sInformers kubeinformers.SharedInformerFactory
config *config.ControllerManagerConfiguration
recorder record.EventRecorder
secretLister kubecorev1listers.SecretLister
secretSynced cache.InformerSynced
plantControl ControlInterface
plantLister gardencorelisters.PlantLister
plantSynced cache.InformerSynced
plantQueue workqueue.RateLimitingInterface
workerCh chan int
numberOfRunningWorkers int
}
// NewController instantiates a new Plant controller.
func NewController(k8sGardenClient kubernetes.Interface,
gardenCoreInformerFactory gardencoreinformers.SharedInformerFactory,
kubeInformerFactory kubeinformers.SharedInformerFactory,
config *config.ControllerManagerConfiguration,
recorder record.EventRecorder) *Controller {
var (
gardenCoreInformer = gardenCoreInformerFactory.Core().V1beta1()
kubeInfomer = kubeInformerFactory.Core().V1()
plantInformer = gardenCoreInformer.Plants()
plantLister = plantInformer.Lister()
secretInformer = kubeInfomer.Secrets()
secretLister = secretInformer.Lister()
plantQueue = workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "plant")
)
controller := &Controller{
k8sInformers: kubeInformerFactory,
config: config,
recorder: recorder,
secretLister: secretLister,
plantLister: plantLister,
plantQueue: plantQueue,
plantControl: NewDefaultPlantControl(k8sGardenClient, recorder, config, plantLister, secretLister),
workerCh: make(chan int),
}
controller.plantSynced = plantInformer.Informer().HasSynced
plantInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: controller.plantAdd,
UpdateFunc: controller.plantUpdate,
DeleteFunc: controller.plantDelete,
})
controller.secretSynced = secretInformer.Informer().HasSynced
secretInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: controller.reconcilePlantForMatchingSecret,
UpdateFunc: controller.plantSecretUpdate,
DeleteFunc: controller.reconcilePlantForMatchingSecret,
})
return controller
}
// 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.plantSynced, c.secretSynced) {
logger.Logger.Error("Timed out waiting for caches to sync")
return
}
go func() {
for res := range c.workerCh {
c.numberOfRunningWorkers += res
logger.Logger.Debugf("Current number of running Plant workers is %d", c.numberOfRunningWorkers)
}
}()
logger.Logger.Info("Plant controller initialized.")
for i := 0; i < workers; i++ {
controllerutils.DeprecatedCreateWorker(ctx, c.plantQueue, "plant", func(key string) error { return c.reconcilePlantKey(ctx, key) }, &waitGroup, c.workerCh)
}
// Shutdown handling
<-ctx.Done()
c.plantQueue.ShutDown()
for {
if c.plantQueue.Len() == 0 && c.numberOfRunningWorkers == 0 {
logger.Logger.Debug("No running Plant worker and no items left in the queues. Terminating Plant controller...")
break
}
logger.Logger.Debugf("Waiting for %d Plant worker(s) to finish (%d item(s) left in the queues)...", c.numberOfRunningWorkers, c.plantQueue.Len())
time.Sleep(5 * time.Second)
}
waitGroup.Wait()
}
// RunningWorkers returns the number of running workers.
func (c *Controller) RunningWorkers() int {
return c.numberOfRunningWorkers
}
// CollectMetrics implements gardenmetrics.ControllerMetricsCollector interface
func (c *Controller) CollectMetrics(ch chan<- prometheus.Metric) {
metric, err := prometheus.NewConstMetric(controllermanager.ControllerWorkerSum, prometheus.GaugeValue, float64(c.RunningWorkers()), "plant")
if err != nil {
controllermanager.ScrapeFailures.With(prometheus.Labels{"kind": "plant-controller"}).Inc()
return
}
ch <- metric
}