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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 issuers
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/util"
)
type Controller struct {
*controllerpkg.Context
// To allow injection for testing.
syncHandler func(ctx context.Context, key string) error
issuerLister cmlisters.IssuerLister
secretLister corelisters.SecretLister
watchedInformers []cache.InformerSynced
queue workqueue.RateLimitingInterface
}
func New(ctx *controllerpkg.Context) *Controller {
ctrl := &Controller{
Context: ctx,
}
ctrl.syncHandler = ctrl.processNextWorkItem
ctrl.queue = workqueue.NewNamedRateLimitingQueue(workqueue.NewItemExponentialFailureRateLimiter(time.Second*5, time.Minute*1), "issuers")
issuerInformer := ctrl.SharedInformerFactory.Certmanager().V1alpha1().Issuers()
issuerInformer.Informer().AddEventHandler(&controllerpkg.QueuingEventHandler{Queue: ctrl.queue})
ctrl.watchedInformers = append(ctrl.watchedInformers, issuerInformer.Informer().HasSynced)
ctrl.issuerLister = issuerInformer.Lister()
secretsInformer := ctrl.KubeSharedInformerFactory.Core().V1().Secrets()
secretsInformer.Informer().AddEventHandler(&controllerpkg.BlockingEventHandler{WorkFunc: ctrl.secretDeleted})
ctrl.watchedInformers = append(ctrl.watchedInformers, secretsInformer.Informer().HasSynced)
ctrl.secretLister = secretsInformer.Lister()
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 was not a Secret object %#v", obj))
return
}
issuers, err := c.issuersForSecret(secret)
if err != nil {
runtime.HandleError(fmt.Errorf("Error looking up issuers observing Secret: %s/%s", secret.Namespace, secret.Name))
return
}
for _, iss := range issuers {
key, err := keyFunc(iss)
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 on are synced
if !cache.WaitForCacheSync(stopCh, c.watchedInformers...) {
// TODO: replace with Errorf call to glog
return fmt.Errorf("error waiting for informer caches to sync")
}
var wg sync.WaitGroup
for i := 0; i < workers; i++ {
wg.Add(1)
// TODO (@munnerz): make time.Second duration configurable
go wait.Until(func() {
defer wg.Done()
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...")
wg.Wait()
glog.V(4).Infof("Workers exited.")
return nil
}
func (c *Controller) worker(stopCh <-chan struct{}) {
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
}
issuer, err := c.issuerLister.Issuers(namespace).Get(name)
if err != nil {
if k8sErrors.IsNotFound(err) {
runtime.HandleError(fmt.Errorf("issuer '%s' in work queue no longer exists", key))
return nil
}
return err
}
return c.Sync(ctx, issuer)
}
var keyFunc = controllerpkg.KeyFunc
const (
ControllerName = "issuers"
)
func init() {
controllerpkg.Register(ControllerName, func(ctx *controllerpkg.Context) controllerpkg.Interface {
return New(ctx).Run
})
}