mirror of https://github.com/k3s-io/k3s
144 lines
4.1 KiB
Go
144 lines
4.1 KiB
Go
/*
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Copyright 2018 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 establish
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import (
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"fmt"
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"time"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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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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"k8s.io/client-go/tools/cache"
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"k8s.io/client-go/util/workqueue"
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"k8s.io/klog"
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"k8s.io/apiextensions-apiserver/pkg/apis/apiextensions"
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client "k8s.io/apiextensions-apiserver/pkg/client/clientset/internalclientset/typed/apiextensions/internalversion"
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informers "k8s.io/apiextensions-apiserver/pkg/client/informers/internalversion/apiextensions/internalversion"
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listers "k8s.io/apiextensions-apiserver/pkg/client/listers/apiextensions/internalversion"
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)
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// EstablishingController controls how and when CRD is established.
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type EstablishingController struct {
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crdClient client.CustomResourceDefinitionsGetter
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crdLister listers.CustomResourceDefinitionLister
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crdSynced cache.InformerSynced
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// To allow injection for testing.
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syncFn func(key string) error
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queue workqueue.RateLimitingInterface
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}
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// NewEstablishingController creates new EstablishingController.
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func NewEstablishingController(crdInformer informers.CustomResourceDefinitionInformer,
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crdClient client.CustomResourceDefinitionsGetter) *EstablishingController {
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ec := &EstablishingController{
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crdClient: crdClient,
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crdLister: crdInformer.Lister(),
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crdSynced: crdInformer.Informer().HasSynced,
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queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "crdEstablishing"),
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}
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ec.syncFn = ec.sync
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return ec
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}
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// QueueCRD adds CRD into the establishing queue.
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func (ec *EstablishingController) QueueCRD(key string, timeout time.Duration) {
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ec.queue.AddAfter(key, timeout)
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}
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// Run starts the EstablishingController.
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func (ec *EstablishingController) Run(stopCh <-chan struct{}) {
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defer utilruntime.HandleCrash()
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defer ec.queue.ShutDown()
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klog.Infof("Starting EstablishingController")
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defer klog.Infof("Shutting down EstablishingController")
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if !cache.WaitForCacheSync(stopCh, ec.crdSynced) {
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return
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}
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// only start one worker thread since its a slow moving API
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go wait.Until(ec.runWorker, time.Second, stopCh)
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<-stopCh
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}
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func (ec *EstablishingController) runWorker() {
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for ec.processNextWorkItem() {
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}
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}
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// processNextWorkItem deals with one key off the queue.
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// It returns false when it's time to quit.
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func (ec *EstablishingController) processNextWorkItem() bool {
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key, quit := ec.queue.Get()
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if quit {
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return false
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}
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defer ec.queue.Done(key)
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err := ec.syncFn(key.(string))
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if err == nil {
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ec.queue.Forget(key)
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return true
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}
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utilruntime.HandleError(fmt.Errorf("%v failed with: %v", key, err))
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ec.queue.AddRateLimited(key)
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return true
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}
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// sync is used to turn CRDs into the Established state.
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func (ec *EstablishingController) sync(key string) error {
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cachedCRD, err := ec.crdLister.Get(key)
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if apierrors.IsNotFound(err) {
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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 !apiextensions.IsCRDConditionTrue(cachedCRD, apiextensions.NamesAccepted) ||
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apiextensions.IsCRDConditionTrue(cachedCRD, apiextensions.Established) {
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return nil
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}
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crd := cachedCRD.DeepCopy()
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establishedCondition := apiextensions.CustomResourceDefinitionCondition{
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Type: apiextensions.Established,
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Status: apiextensions.ConditionTrue,
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Reason: "InitialNamesAccepted",
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Message: "the initial names have been accepted",
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}
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apiextensions.SetCRDCondition(crd, establishedCondition)
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// Update server with new CRD condition.
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_, err = ec.crdClient.CustomResourceDefinitions().UpdateStatus(crd)
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if err != nil {
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return err
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}
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return nil
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}
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