/
controller.go
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/
controller.go
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/*
Copyright 2018 The Jetstack cert-manager contributors.
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 certificates
import (
"context"
"fmt"
"sync"
"time"
"github.com/golang/glog"
corev1 "k8s.io/api/core/v1"
k8sErrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/wait"
corelisters "k8s.io/client-go/listers/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/workqueue"
cmlisters "github.com/jetstack/cert-manager/pkg/client/listers/certmanager/v1alpha1"
controllerpkg "github.com/jetstack/cert-manager/pkg/controller"
"github.com/jetstack/cert-manager/pkg/scheduler"
"github.com/jetstack/cert-manager/pkg/util"
)
type Controller struct {
*controllerpkg.Context
// To allow injection for testing.
syncHandler func(ctx context.Context, key string) error
issuerLister cmlisters.IssuerLister
clusterIssuerLister cmlisters.ClusterIssuerLister
certificateLister cmlisters.CertificateLister
secretLister corelisters.SecretLister
queue workqueue.RateLimitingInterface
scheduledWorkQueue scheduler.ScheduledWorkQueue
workerWg sync.WaitGroup
syncedFuncs []cache.InformerSynced
}
// New returns a new Certificates controller. It sets up the informer handler
// functions for all the types it watches.
func New(ctx *controllerpkg.Context) *Controller {
ctrl := &Controller{Context: ctx}
ctrl.syncHandler = ctrl.processNextWorkItem
ctrl.queue = workqueue.NewNamedRateLimitingQueue(workqueue.NewItemExponentialFailureRateLimiter(time.Second*2, time.Minute*1), "certificates")
// Create a scheduled work queue that calls the ctrl.queue.Add method for
// each object in the queue. This is used to schedule re-checks of
// Certificate resources when they get near to expiry
ctrl.scheduledWorkQueue = scheduler.NewScheduledWorkQueue(ctrl.queue.AddRateLimited)
certificateInformer := ctrl.SharedInformerFactory.Certmanager().V1alpha1().Certificates()
certificateInformer.Informer().AddEventHandler(&controllerpkg.QueuingEventHandler{Queue: ctrl.queue})
ctrl.certificateLister = certificateInformer.Lister()
ctrl.syncedFuncs = append(ctrl.syncedFuncs, certificateInformer.Informer().HasSynced)
issuerInformer := ctrl.SharedInformerFactory.Certmanager().V1alpha1().Issuers()
ctrl.issuerLister = issuerInformer.Lister()
ctrl.syncedFuncs = append(ctrl.syncedFuncs, issuerInformer.Informer().HasSynced)
clusterIssuerInformer := ctrl.SharedInformerFactory.Certmanager().V1alpha1().ClusterIssuers()
ctrl.clusterIssuerLister = clusterIssuerInformer.Lister()
ctrl.syncedFuncs = append(ctrl.syncedFuncs, clusterIssuerInformer.Informer().HasSynced)
secretsInformer := ctrl.KubeSharedInformerFactory.Core().V1().Secrets()
secretsInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
DeleteFunc: ctrl.secretDeleted,
})
ctrl.secretLister = secretsInformer.Lister()
ctrl.syncedFuncs = append(ctrl.syncedFuncs, secretsInformer.Informer().HasSynced)
// We add pod, service and ingress informers to the list of informers to sync.
// They are not actually used directly by the Certificates controller,
// however the ACME HTTP challenge solver *does* require a Pod and Secret
// lister, and due to the way the instantiation of issuers is performed it
// is far more performant to perform the sync here.
// This will be refactored into a dedicated 'challenges' controller in future.
ingressInformer := ctrl.KubeSharedInformerFactory.Extensions().V1beta1().Ingresses()
podsInformer := ctrl.KubeSharedInformerFactory.Core().V1().Pods()
serviceInformer := ctrl.KubeSharedInformerFactory.Core().V1().Services()
ctrl.syncedFuncs = append(ctrl.syncedFuncs, ingressInformer.Informer().HasSynced)
ctrl.syncedFuncs = append(ctrl.syncedFuncs, podsInformer.Informer().HasSynced)
ctrl.syncedFuncs = append(ctrl.syncedFuncs, serviceInformer.Informer().HasSynced)
return ctrl
}
// TODO: replace with generic handleObjet function (like Navigator)
func (c *Controller) secretDeleted(obj interface{}) {
var secret *corev1.Secret
var ok bool
secret, ok = obj.(*corev1.Secret)
if !ok {
runtime.HandleError(fmt.Errorf("Object is not a Secret object %#v", obj))
return
}
crts, err := c.certificatesForSecret(secret)
if err != nil {
runtime.HandleError(fmt.Errorf("Error looking up Certificates observing Secret: %s/%s", secret.Namespace, secret.Name))
return
}
for _, crt := range crts {
key, err := keyFunc(crt)
if err != nil {
runtime.HandleError(err)
continue
}
c.queue.AddRateLimited(key)
}
}
func (c *Controller) Run(workers int, stopCh <-chan struct{}) error {
glog.V(4).Infof("Starting %s control loop", ControllerName)
// wait for all the informer caches we depend to sync
if !cache.WaitForCacheSync(stopCh, c.syncedFuncs...) {
return fmt.Errorf("error waiting for informer caches to sync")
}
glog.V(4).Infof("Synced all caches for %s control loop", ControllerName)
for i := 0; i < workers; i++ {
c.workerWg.Add(1)
// TODO (@munnerz): make time.Second duration configurable
go wait.Until(func() { c.worker(stopCh) }, time.Second, stopCh)
}
<-stopCh
glog.V(4).Infof("Shutting down queue as workqueue signaled shutdown")
c.queue.ShutDown()
glog.V(4).Infof("Waiting for workers to exit...")
c.workerWg.Wait()
glog.V(4).Infof("Workers exited.")
return nil
}
func (c *Controller) worker(stopCh <-chan struct{}) {
defer c.workerWg.Done()
glog.V(4).Infof("Starting %q worker", ControllerName)
for {
obj, shutdown := c.queue.Get()
if shutdown {
break
}
var key string
err := func(obj interface{}) error {
defer c.queue.Done(obj)
var ok bool
if key, ok = obj.(string); !ok {
return nil
}
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
ctx = util.ContextWithStopCh(ctx, stopCh)
glog.Infof("%s controller: syncing item '%s'", ControllerName, key)
if err := c.syncHandler(ctx, key); err != nil {
return err
}
c.queue.Forget(obj)
return nil
}(obj)
if err != nil {
glog.Errorf("%s controller: Re-queuing item %q due to error processing: %s", ControllerName, key, err.Error())
c.queue.AddRateLimited(obj)
continue
}
glog.Infof("%s controller: Finished processing work item %q", ControllerName, key)
}
glog.V(4).Infof("Exiting %q worker loop", ControllerName)
}
func (c *Controller) processNextWorkItem(ctx context.Context, key string) error {
namespace, name, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
runtime.HandleError(fmt.Errorf("invalid resource key: %s", key))
return nil
}
crt, err := c.certificateLister.Certificates(namespace).Get(name)
if err != nil {
if k8sErrors.IsNotFound(err) {
c.scheduledWorkQueue.Forget(key)
runtime.HandleError(fmt.Errorf("certificate '%s' in work queue no longer exists", key))
return nil
}
return err
}
return c.Sync(ctx, crt)
}
var keyFunc = controllerpkg.KeyFunc
const (
ControllerName = "certificates"
)
func init() {
controllerpkg.Register(ControllerName, func(ctx *controllerpkg.Context) controllerpkg.Interface {
return New(ctx).Run
})
}