281 lines
9.2 KiB
Go
281 lines
9.2 KiB
Go
/*
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Copyright 2019 The KubeSphere 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 certificatesigningrequest
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import (
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"context"
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"fmt"
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"time"
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certificatesv1beta1 "k8s.io/api/certificates/v1beta1"
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corev1 "k8s.io/api/core/v1"
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"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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certificatesinformers "k8s.io/client-go/informers/certificates/v1beta1"
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corev1informers "k8s.io/client-go/informers/core/v1"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/kubernetes/scheme"
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typedcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
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certificateslisters "k8s.io/client-go/listers/certificates/v1beta1"
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"k8s.io/client-go/rest"
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"k8s.io/client-go/tools/cache"
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"k8s.io/client-go/tools/record"
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"k8s.io/client-go/util/workqueue"
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"k8s.io/klog"
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"kubesphere.io/kubesphere/pkg/constants"
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"kubesphere.io/kubesphere/pkg/models/kubeconfig"
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)
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const (
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// SuccessSynced is used as part of the Event 'reason' when a Foo is csrSynced
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successSynced = "Synced"
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// is csrSynced successfully
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messageResourceSynced = "CertificateSigningRequest csrSynced successfully"
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controllerName = "csr-controller"
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)
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type Controller struct {
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k8sclient kubernetes.Interface
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csrInformer certificatesinformers.CertificateSigningRequestInformer
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csrLister certificateslisters.CertificateSigningRequestLister
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csrSynced cache.InformerSynced
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cmSynced cache.InformerSynced
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// workqueue is a rate limited work queue. This is used to queue work to be
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// processed instead of performing it as soon as a change happens. This
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// means we can ensure we only process a fixed amount of resources at a
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// time, and makes it easy to ensure we are never processing the same item
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// simultaneously in two different workers.
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workqueue workqueue.RateLimitingInterface
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// recorder is an event recorder for recording Event resources to the
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// Kubernetes API.
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recorder record.EventRecorder
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kubeconfigOperator kubeconfig.Interface
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}
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func NewController(k8sClient kubernetes.Interface, csrInformer certificatesinformers.CertificateSigningRequestInformer,
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configMapInformer corev1informers.ConfigMapInformer, config *rest.Config) *Controller {
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// Create event broadcaster
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// Add sample-controller types to the default Kubernetes Scheme so Events can be
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// logged for sample-controller types.
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klog.V(4).Info("Creating event broadcaster")
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eventBroadcaster := record.NewBroadcaster()
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eventBroadcaster.StartLogging(klog.Infof)
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eventBroadcaster.StartRecordingToSink(&typedcorev1.EventSinkImpl{Interface: k8sClient.CoreV1().Events("")})
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recorder := eventBroadcaster.NewRecorder(scheme.Scheme, corev1.EventSource{Component: controllerName})
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ctl := &Controller{
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k8sclient: k8sClient,
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csrInformer: csrInformer,
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csrLister: csrInformer.Lister(),
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csrSynced: csrInformer.Informer().HasSynced,
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cmSynced: configMapInformer.Informer().HasSynced,
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kubeconfigOperator: kubeconfig.NewOperator(k8sClient, configMapInformer, config),
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workqueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "CertificateSigningRequest"),
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recorder: recorder,
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}
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klog.Info("Setting up event handlers")
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csrInformer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{
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AddFunc: ctl.enqueueCertificateSigningRequest,
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UpdateFunc: func(old, new interface{}) {
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ctl.enqueueCertificateSigningRequest(new)
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},
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DeleteFunc: ctl.enqueueCertificateSigningRequest,
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})
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return ctl
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}
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func (c *Controller) Run(threadiness int, stopCh <-chan struct{}) error {
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defer utilruntime.HandleCrash()
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defer c.workqueue.ShutDown()
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// Start the csrInformer factories to begin populating the csrInformer caches
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klog.Info("Starting CSR controller")
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// Wait for the caches to be csrSynced before starting workers
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klog.Info("Waiting for csrInformer caches to sync")
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if ok := cache.WaitForCacheSync(stopCh, c.csrSynced, c.cmSynced); !ok {
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return fmt.Errorf("failed to wait for caches to sync")
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}
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klog.Info("Starting workers")
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// Launch two workers to process Foo resources
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for i := 0; i < threadiness; i++ {
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go wait.Until(c.runWorker, time.Second, stopCh)
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}
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klog.Info("Started workers")
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<-stopCh
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klog.Info("Shutting down workers")
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return nil
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}
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func (c *Controller) enqueueCertificateSigningRequest(obj interface{}) {
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var key string
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var err error
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if key, err = cache.MetaNamespaceKeyFunc(obj); err != nil {
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utilruntime.HandleError(err)
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return
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}
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c.workqueue.Add(key)
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}
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func (c *Controller) runWorker() {
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for c.processNextWorkItem() {
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}
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}
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func (c *Controller) processNextWorkItem() bool {
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obj, shutdown := c.workqueue.Get()
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if shutdown {
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return false
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}
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// We wrap this block in a func so we can defer c.workqueue.Done.
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err := func(obj interface{}) error {
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// We call Done here so the workqueue knows we have finished
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// processing this item. We also must remember to call Forget if we
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// do not want this work item being re-queued. For example, we do
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// not call Forget if a transient error occurs, instead the item is
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// put back on the workqueue and attempted again after a back-off
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// period.
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defer c.workqueue.Done(obj)
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var key string
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var ok bool
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// We expect strings to come off the workqueue. These are of the
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// form namespace/name. We do this as the delayed nature of the
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// workqueue means the items in the csrInformer cache may actually be
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// more up to date that when the item was initially put onto the
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// workqueue.
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if key, ok = obj.(string); !ok {
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// As the item in the workqueue is actually invalid, we call
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// Forget here else we'd go into a loop of attempting to
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// process a work item that is invalid.
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c.workqueue.Forget(obj)
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utilruntime.HandleError(fmt.Errorf("expected string in workqueue but got %#v", obj))
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return nil
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}
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// Run the reconcile, passing it the namespace/name string of the
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// Foo resource to be csrSynced.
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if err := c.reconcile(key); err != nil {
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// Put the item back on the workqueue to handle any transient errors.
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c.workqueue.AddRateLimited(key)
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return fmt.Errorf("error syncing '%s': %s, requeuing", key, err.Error())
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}
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// Finally, if no error occurs we Forget this item so it does not
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// get queued again until another change happens.
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c.workqueue.Forget(obj)
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klog.Infof("Successfully csrSynced %s:%s", "key", key)
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return nil
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}(obj)
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if err != nil {
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utilruntime.HandleError(err)
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return true
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}
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return true
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}
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// syncHandler compares the actual state with the desired, and attempts to
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// converge the two. It then updates the Status block of the Foo resource
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// with the current status of the resource.
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func (c *Controller) reconcile(key string) error {
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// Get the CertificateSigningRequest with this name
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csr, err := c.csrLister.Get(key)
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if err != nil {
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// The user may no longer exist, in which case we stop
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// processing.
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if errors.IsNotFound(err) {
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utilruntime.HandleError(fmt.Errorf("csr '%s' in work queue no longer exists", key))
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return nil
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}
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klog.Error(err)
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return err
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}
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// csr create by kubesphere auto approve
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if username := csr.Labels[constants.UsernameLabelKey]; username != "" {
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err = c.Approve(csr)
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if err != nil {
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klog.Error(err)
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return err
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}
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// certificate data is not empty
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if len(csr.Status.Certificate) > 0 {
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err = c.UpdateKubeconfig(csr)
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if err != nil {
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// kubeconfig not generated
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klog.Error(err)
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return err
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}
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// release
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err := c.k8sclient.CertificatesV1beta1().CertificateSigningRequests().Delete(context.Background(), csr.Name, *metav1.NewDeleteOptions(0))
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if err != nil {
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klog.Error(err)
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return err
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}
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}
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}
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c.recorder.Event(csr, corev1.EventTypeNormal, successSynced, messageResourceSynced)
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return nil
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}
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func (c *Controller) Start(stopCh <-chan struct{}) error {
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return c.Run(4, stopCh)
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}
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func (c *Controller) Approve(csr *certificatesv1beta1.CertificateSigningRequest) error {
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// is approved
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if len(csr.Status.Certificate) > 0 {
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return nil
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}
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csr.Status = certificatesv1beta1.CertificateSigningRequestStatus{
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Conditions: []certificatesv1beta1.CertificateSigningRequestCondition{{
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Type: "Approved",
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Reason: "KubeSphereApprove",
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Message: "This CSR was approved by KubeSphere",
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LastUpdateTime: metav1.Time{
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Time: time.Now(),
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},
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}},
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}
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// approve csr
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csr, err := c.k8sclient.CertificatesV1beta1().CertificateSigningRequests().UpdateApproval(context.Background(), csr, metav1.UpdateOptions{})
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if err != nil {
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klog.Errorln(err)
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return err
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}
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return nil
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}
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func (c *Controller) UpdateKubeconfig(csr *certificatesv1beta1.CertificateSigningRequest) error {
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username := csr.Labels[constants.UsernameLabelKey]
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err := c.kubeconfigOperator.UpdateKubeconfig(username, csr)
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if err != nil {
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klog.Error(err)
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}
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return err
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}
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