2018-01-09 18:57:14 +00:00
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/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package bootstrap
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import (
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"fmt"
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"time"
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"github.com/golang/glog"
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"k8s.io/api/core/v1"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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utilruntime "k8s.io/apimachinery/pkg/util/runtime"
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"k8s.io/apimachinery/pkg/util/wait"
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coreinformers "k8s.io/client-go/informers/core/v1"
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clientset "k8s.io/client-go/kubernetes"
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corelisters "k8s.io/client-go/listers/core/v1"
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bootstrapapi "k8s.io/client-go/tools/bootstrap/token/api"
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"k8s.io/client-go/tools/cache"
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"k8s.io/client-go/util/workqueue"
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api "k8s.io/kubernetes/pkg/apis/core"
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"k8s.io/kubernetes/pkg/controller"
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"k8s.io/kubernetes/pkg/util/metrics"
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)
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// TokenCleanerOptions contains options for the TokenCleaner
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type TokenCleanerOptions struct {
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// TokenSecretNamespace string is the namespace for token Secrets.
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TokenSecretNamespace string
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// SecretResync is the time.Duration at which to fully re-list secrets.
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// If zero, re-list will be delayed as long as possible
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SecretResync time.Duration
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}
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// DefaultTokenCleanerOptions returns a set of default options for creating a
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// TokenCleaner
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func DefaultTokenCleanerOptions() TokenCleanerOptions {
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return TokenCleanerOptions{
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TokenSecretNamespace: api.NamespaceSystem,
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}
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}
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// TokenCleaner is a controller that deletes expired tokens
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type TokenCleaner struct {
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tokenSecretNamespace string
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client clientset.Interface
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// secretLister is able to list/get secrets and is populated by the shared informer passed to NewTokenCleaner.
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secretLister corelisters.SecretLister
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// secretSynced returns true if the secret shared informer has been synced at least once.
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secretSynced cache.InformerSynced
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queue workqueue.RateLimitingInterface
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}
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// NewTokenCleaner returns a new *NewTokenCleaner.
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func NewTokenCleaner(cl clientset.Interface, secrets coreinformers.SecretInformer, options TokenCleanerOptions) (*TokenCleaner, error) {
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e := &TokenCleaner{
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client: cl,
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secretLister: secrets.Lister(),
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secretSynced: secrets.Informer().HasSynced,
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tokenSecretNamespace: options.TokenSecretNamespace,
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queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "token_cleaner"),
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}
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if cl.CoreV1().RESTClient().GetRateLimiter() != nil {
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if err := metrics.RegisterMetricAndTrackRateLimiterUsage("token_cleaner", cl.CoreV1().RESTClient().GetRateLimiter()); err != nil {
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return nil, err
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}
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}
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2018-03-06 22:33:18 +00:00
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secrets.Informer().AddEventHandlerWithResyncPeriod(
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cache.FilteringResourceEventHandler{
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FilterFunc: func(obj interface{}) bool {
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switch t := obj.(type) {
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case *v1.Secret:
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return t.Type == bootstrapapi.SecretTypeBootstrapToken && t.Namespace == e.tokenSecretNamespace
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default:
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utilruntime.HandleError(fmt.Errorf("object passed to %T that is not expected: %T", e, obj))
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return false
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}
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},
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Handler: cache.ResourceEventHandlerFuncs{
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AddFunc: e.enqueueSecrets,
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UpdateFunc: func(oldSecret, newSecret interface{}) { e.enqueueSecrets(newSecret) },
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},
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},
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options.SecretResync,
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)
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return e, nil
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}
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// Run runs controller loops and returns when they are done
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func (tc *TokenCleaner) Run(stopCh <-chan struct{}) {
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defer utilruntime.HandleCrash()
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defer tc.queue.ShutDown()
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glog.Infof("Starting token cleaner controller")
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defer glog.Infof("Shutting down token cleaner controller")
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if !controller.WaitForCacheSync("token_cleaner", stopCh, tc.secretSynced) {
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return
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}
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go wait.Until(tc.worker, 10*time.Second, stopCh)
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<-stopCh
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}
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func (tc *TokenCleaner) enqueueSecrets(obj interface{}) {
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key, err := controller.KeyFunc(obj)
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if err != nil {
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utilruntime.HandleError(err)
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return
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}
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tc.queue.Add(key)
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}
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// worker runs a thread that dequeues secrets, handles them, and marks them done.
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func (tc *TokenCleaner) worker() {
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for tc.processNextWorkItem() {
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}
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}
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// processNextWorkItem deals with one key off the queue. It returns false when it's time to quit.
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func (tc *TokenCleaner) processNextWorkItem() bool {
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key, quit := tc.queue.Get()
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if quit {
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return false
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}
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defer tc.queue.Done(key)
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if err := tc.syncFunc(key.(string)); err != nil {
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tc.queue.AddRateLimited(key)
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utilruntime.HandleError(fmt.Errorf("Sync %v failed with : %v", key, err))
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return true
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}
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tc.queue.Forget(key)
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return true
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}
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func (tc *TokenCleaner) syncFunc(key string) error {
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startTime := time.Now()
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defer func() {
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glog.V(4).Infof("Finished syncing secret %q (%v)", key, time.Now().Sub(startTime))
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}()
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namespace, name, err := cache.SplitMetaNamespaceKey(key)
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if err != nil {
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return err
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}
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ret, err := tc.secretLister.Secrets(namespace).Get(name)
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if apierrors.IsNotFound(err) {
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glog.V(3).Infof("secret has been deleted: %v", key)
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return nil
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}
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if err != nil {
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return err
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}
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if ret.Type == bootstrapapi.SecretTypeBootstrapToken {
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tc.evalSecret(ret)
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}
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return nil
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}
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func (tc *TokenCleaner) evalSecret(o interface{}) {
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secret := o.(*v1.Secret)
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if isSecretExpired(secret) {
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glog.V(3).Infof("Deleting expired secret %s/%s", secret.Namespace, secret.Name)
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var options *metav1.DeleteOptions
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if len(secret.UID) > 0 {
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options = &metav1.DeleteOptions{Preconditions: &metav1.Preconditions{UID: &secret.UID}}
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}
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err := tc.client.CoreV1().Secrets(secret.Namespace).Delete(secret.Name, options)
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// NotFound isn't a real error (it's already been deleted)
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// Conflict isn't a real error (the UID precondition failed)
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if err != nil && !apierrors.IsConflict(err) && !apierrors.IsNotFound(err) {
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glog.V(3).Infof("Error deleting Secret: %v", err)
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}
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}
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}
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