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bastion.go
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bastion.go
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// Copyright (c) 2021 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 bastion
import (
"context"
"fmt"
"sync"
"time"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
operationsv1alpha1 "github.com/gardener/gardener/pkg/apis/operations/v1alpha1"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap/keys"
"github.com/gardener/gardener/pkg/controllermanager"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/logger"
"github.com/prometheus/client_golang/prometheus"
"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"
)
const (
// ControllerName is the name of this controller.
ControllerName = "bastion-controller"
)
// Controller controls Bastions.
type Controller struct {
reconciler reconcile.Reconciler
hasSyncedFuncs []cache.InformerSynced
gardenClient client.Client
bastionQueue workqueue.RateLimitingInterface
workerCh chan int
numberOfRunningWorkers int
maxLifetime time.Duration
}
// NewBastionController takes a Kubernetes client <k8sGardenClient> and a <k8sGardenCoreInformers> for the Garden clusters.
// It creates and returns a new Garden controller to control Bastions.
func NewBastionController(
ctx context.Context,
clientMap clientmap.ClientMap,
maxLifetime time.Duration,
) (
*Controller,
error,
) {
gardenClient, err := clientMap.GetClient(ctx, keys.ForGarden())
if err != nil {
return nil, err
}
bastionInformer, err := gardenClient.Cache().GetInformer(ctx, &operationsv1alpha1.Bastion{})
if err != nil {
return nil, fmt.Errorf("failed to get Bastion Informer: %w", err)
}
shootInformer, err := gardenClient.Cache().GetInformer(ctx, &gardencorev1beta1.Shoot{})
if err != nil {
return nil, fmt.Errorf("failed to get Shoot Informer: %w", err)
}
logger := logger.Logger.WithField("controller", ControllerName)
bastionController := &Controller{
gardenClient: gardenClient.Client(),
bastionQueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "bastion"),
reconciler: NewBastionReconciler(logger, gardenClient.Client(), maxLifetime),
workerCh: make(chan int),
maxLifetime: maxLifetime,
}
bastionInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: bastionController.bastionAdd,
UpdateFunc: bastionController.bastionUpdate,
DeleteFunc: bastionController.bastionDelete,
})
shootInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) { bastionController.shootAdd(ctx, obj) },
UpdateFunc: func(old, new interface{}) { bastionController.shootUpdate(ctx, old, new) },
DeleteFunc: func(obj interface{}) { bastionController.shootDelete(ctx, obj) },
})
bastionController.hasSyncedFuncs = append(bastionController.hasSyncedFuncs, bastionInformer.HasSynced, shootInformer.HasSynced)
return bastionController, 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
// Check if informers cache has been populated
if !cache.WaitForCacheSync(ctx.Done(), c.hasSyncedFuncs...) {
logger.Logger.Error("Time out waiting for caches to sync")
return
}
go func() {
for res := range c.workerCh {
c.numberOfRunningWorkers += res
logger.Logger.Debugf("Current number of running Bastion workers is %d", c.numberOfRunningWorkers)
}
}()
logger.Logger.Info("Bastion controller initialized.")
// Start the workers
for i := 0; i < workers; i++ {
controllerutils.CreateWorker(ctx, c.bastionQueue, "Bastion", c.reconciler, &waitGroup, c.workerCh)
}
<-ctx.Done()
c.bastionQueue.ShutDown()
for {
if c.bastionQueue.Len() == 0 && c.numberOfRunningWorkers == 0 {
logger.Logger.Debug("No running Bastion worker and no items left in the queues. Terminating Bastion controller...")
break
}
logger.Logger.Debugf("Waiting for %d Bastion worker(s) to finish (%d item(s) left in the queues)...", c.numberOfRunningWorkers, c.bastionQueue.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()), "bastion")
if err != nil {
controllermanager.ScrapeFailures.With(prometheus.Labels{"kind": ControllerName}).Inc()
return
}
ch <- metric
}