/
certificatesigningrequest.go
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/
certificatesigningrequest.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 certificatesigningrequest
import (
"context"
"fmt"
"sync"
"time"
"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"
certificatesv1 "k8s.io/api/certificates/v1"
certificatesv1beta1 "k8s.io/api/certificates/v1beta1"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
ctrlruntimecache "sigs.k8s.io/controller-runtime/pkg/cache"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
)
// Controller controls CertificateSigningRequests.
type Controller struct {
reconciler reconcile.Reconciler
hasSyncedFuncs []cache.InformerSynced
csrQueue workqueue.RateLimitingInterface
workerCh chan int
numberOfRunningWorkers int
}
// NewCSRController takes a Kubernetes client for the Garden clusters <k8sGardenClient>, a struct
// holding information about the acting Gardener, a <kubeInformerFactory>, and a <recorder> for
// event recording. It creates a new CSR controller.
func NewCSRController(
ctx context.Context,
clientMap clientmap.ClientMap,
) (
*Controller,
error,
) {
gardenClient, err := clientMap.GetClient(ctx, keys.ForGarden())
if err != nil {
return nil, err
}
var (
csrInformer ctrlruntimecache.Informer
certificatesAPIVersion = "v1"
)
csrInformer, err = gardenClient.Cache().GetInformer(ctx, &certificatesv1.CertificateSigningRequest{})
if err != nil {
if !meta.IsNoMatchError(err) {
return nil, fmt.Errorf("failed to get CSR Informer: %w", err)
}
// fallback to v1beta1
csrInformer, err = gardenClient.Cache().GetInformer(ctx, &certificatesv1beta1.CertificateSigningRequest{})
if err != nil {
return nil, fmt.Errorf("failed to get CSR Informer: %w", err)
}
certificatesAPIVersion = "v1beta1"
}
csrController := &Controller{
reconciler: NewCSRReconciler(logger.Logger, gardenClient, certificatesAPIVersion),
csrQueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "CertificateSigningRequest"),
workerCh: make(chan int),
}
csrInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: csrController.csrAdd,
UpdateFunc: csrController.csrUpdate,
})
csrController.hasSyncedFuncs = append(csrController.hasSyncedFuncs, csrInformer.HasSynced)
return csrController, nil
}
// Run runs the Controller until the given context <ctx> is alive.
func (c *Controller) Run(ctx context.Context, workers int) {
var waitGroup sync.WaitGroup
if !cache.WaitForCacheSync(ctx.Done(), c.hasSyncedFuncs...) {
logger.Logger.Error("Timed out waiting for caches to sync")
return
}
// Count number of running workers.
go func() {
for res := range c.workerCh {
c.numberOfRunningWorkers += res
logger.Logger.Debugf("Current number of running CertificateSigningRequest workers is %d", c.numberOfRunningWorkers)
}
}()
logger.Logger.Info("CertificateSigningRequest controller initialized.")
for i := 0; i < workers; i++ {
controllerutils.CreateWorker(ctx, c.csrQueue, "CertificateSigningRequest", c.reconciler, &waitGroup, c.workerCh)
}
// Shutdown handling
<-ctx.Done()
c.csrQueue.ShutDown()
for {
if c.csrQueue.Len() == 0 && c.numberOfRunningWorkers == 0 {
logger.Logger.Debug("No running CertificateSigningRequest worker and no items left in the queues. Terminated CertificateSigningRequest controller...")
break
}
logger.Logger.Debugf("Waiting for %d CertificateSigningRequest worker(s) to finish (%d item(s) left in the queues)...", c.numberOfRunningWorkers, c.csrQueue.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()), "csr")
if err != nil {
controllermanager.ScrapeFailures.With(prometheus.Labels{"kind": "csr-controller"}).Inc()
return
}
ch <- metric
}