/* Copyright 2020 The Kruise Authors. 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 controller import ( "fmt" "sync" "time" extclient "github.com/openkruise/kruise/pkg/client" webhookutil "github.com/openkruise/kruise/pkg/webhook/util" "github.com/openkruise/kruise/pkg/webhook/util/configuration" "github.com/openkruise/kruise/pkg/webhook/util/generator" "github.com/openkruise/kruise/pkg/webhook/util/writer" "k8s.io/api/admissionregistration/v1beta1" v1 "k8s.io/api/core/v1" "k8s.io/apimachinery/pkg/types" utilruntime "k8s.io/apimachinery/pkg/util/runtime" "k8s.io/apimachinery/pkg/util/wait" "k8s.io/client-go/informers" admissionregistrationinformers "k8s.io/client-go/informers/admissionregistration/v1beta1" coreinformers "k8s.io/client-go/informers/core/v1" clientset "k8s.io/client-go/kubernetes" admissionregistrationlisters "k8s.io/client-go/listers/admissionregistration/v1beta1" corelisters "k8s.io/client-go/listers/core/v1" "k8s.io/client-go/tools/cache" "k8s.io/client-go/util/workqueue" "k8s.io/klog" "sigs.k8s.io/controller-runtime/pkg/client" "sigs.k8s.io/controller-runtime/pkg/webhook/admission" ) var ( mutatingWebhookConfigurationName = "kruise-mutating-webhook-configuration" validatingWebhookConfigurationName = "kruise-validating-webhook-configuration" namespace = webhookutil.GetNamespace() secretName = webhookutil.GetSecretName() uninit = make(chan struct{}) onceInit = sync.Once{} ) func Inited() chan struct{} { return uninit } type Controller struct { kubeClient clientset.Interface runtimeClient client.Client handlers map[string]admission.Handler informerFactory informers.SharedInformerFactory secretLister corelisters.SecretNamespaceLister mutatingWCLister admissionregistrationlisters.MutatingWebhookConfigurationLister validatingWCLister admissionregistrationlisters.ValidatingWebhookConfigurationLister synced []cache.InformerSynced queue workqueue.RateLimitingInterface } func New(cli client.Client, handlers map[string]admission.Handler) (*Controller, error) { c := &Controller{ kubeClient: extclient.GetGenericClient().KubeClient, runtimeClient: cli, handlers: handlers, queue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "webhook-controller"), } c.informerFactory = informers.NewSharedInformerFactory(c.kubeClient, 0) secretInformer := coreinformers.New(c.informerFactory, namespace, nil).Secrets() c.secretLister = secretInformer.Lister().Secrets(namespace) admissionRegistrationInformer := admissionregistrationinformers.New(c.informerFactory, v1.NamespaceAll, nil) c.mutatingWCLister = admissionRegistrationInformer.MutatingWebhookConfigurations().Lister() c.validatingWCLister = admissionRegistrationInformer.ValidatingWebhookConfigurations().Lister() c.synced = []cache.InformerSynced{ secretInformer.Informer().HasSynced, admissionRegistrationInformer.MutatingWebhookConfigurations().Informer().HasSynced, admissionRegistrationInformer.ValidatingWebhookConfigurations().Informer().HasSynced, } secretInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{ AddFunc: func(obj interface{}) { secret := obj.(*v1.Secret) if secret.Name == secretName { klog.Infof("Secret %s added", secretName) c.queue.Add("") } }, UpdateFunc: func(old, cur interface{}) { secret := cur.(*v1.Secret) if secret.Name == secretName { klog.Infof("Secret %s updated", secretName) c.queue.Add("") } }, }) admissionRegistrationInformer.MutatingWebhookConfigurations().Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{ AddFunc: func(obj interface{}) { conf := obj.(*v1beta1.MutatingWebhookConfiguration) if conf.Name == mutatingWebhookConfigurationName { klog.Infof("MutatingWebhookConfiguration %s added", mutatingWebhookConfigurationName) c.queue.Add("") } }, UpdateFunc: func(old, cur interface{}) { conf := cur.(*v1beta1.MutatingWebhookConfiguration) if conf.Name == mutatingWebhookConfigurationName { klog.Infof("MutatingWebhookConfiguration %s update", mutatingWebhookConfigurationName) c.queue.Add("") } }, }) admissionRegistrationInformer.ValidatingWebhookConfigurations().Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{ AddFunc: func(obj interface{}) { conf := obj.(*v1beta1.ValidatingWebhookConfiguration) if conf.Name == validatingWebhookConfigurationName { klog.Infof("ValidatingWebhookConfiguration %s added", validatingWebhookConfigurationName) c.queue.Add("") } }, UpdateFunc: func(old, cur interface{}) { conf := cur.(*v1beta1.ValidatingWebhookConfiguration) if conf.Name == validatingWebhookConfigurationName { klog.Infof("ValidatingWebhookConfiguration %s updated", validatingWebhookConfigurationName) c.queue.Add("") } }, }) return c, nil } func (c *Controller) Start(stopCh <-chan struct{}) { defer utilruntime.HandleCrash() defer c.queue.ShutDown() klog.Infof("Starting webhook-controller") defer klog.Infof("Shutting down webhook-controller") c.informerFactory.Start(stopCh) if !cache.WaitForNamedCacheSync("webhook-controller", stopCh, c.synced...) { return } go wait.Until(func() { for c.processNextWorkItem() { } }, time.Second, stopCh) klog.Infof("Started webhook-controller") <-stopCh } func (c *Controller) processNextWorkItem() bool { key, quit := c.queue.Get() if quit { return false } defer c.queue.Done(key) err := c.sync() if err == nil { c.queue.Forget(key) return true } utilruntime.HandleError(fmt.Errorf("sync %q failed with %v", key, err)) c.queue.AddRateLimited(key) return true } func (c *Controller) sync() error { klog.Infof("Starting to sync webhook certs and configurations") defer func() { klog.Infof("Finished to sync webhook certs and configurations") }() var dnsName string var certWriter writer.CertWriter var err error if dnsName = webhookutil.GetHost(); len(dnsName) > 0 { certWriter, err = writer.NewFSCertWriter(writer.FSCertWriterOptions{ Path: webhookutil.GetCertDir(), }) } else { dnsName = generator.ServiceToCommonName(webhookutil.GetNamespace(), webhookutil.GetServiceName()) certWriter, err = writer.NewSecretCertWriter(writer.SecretCertWriterOptions{ Client: c.runtimeClient, Secret: &types.NamespacedName{Namespace: webhookutil.GetNamespace(), Name: webhookutil.GetSecretName()}, }) } if err != nil { return fmt.Errorf("failed to ensure certs: %v", err) } certs, _, err := certWriter.EnsureCert(dnsName) if err != nil { return fmt.Errorf("failed to ensure certs: %v", err) } if err := writer.WriteCertsToDir(webhookutil.GetCertDir(), certs); err != nil { return fmt.Errorf("failed to write certs to dir: %v", err) } if err := configuration.Ensure(c.runtimeClient, c.handlers, certs.CACert); err != nil { return fmt.Errorf("failed to ensure configuration: %v", err) } onceInit.Do(func() { close(uninit) }) return nil }