Split snapshot controller using beta APIs
This commit is contained in:
xing-yang
280
pkg/sidecar-controller/snapshot_controller_base.go
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280
pkg/sidecar-controller/snapshot_controller_base.go
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/*
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Copyright 2019 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 sidecar_controller
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import (
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"fmt"
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"time"
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crdv1 "github.com/kubernetes-csi/external-snapshotter/pkg/apis/volumesnapshot/v1beta1"
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clientset "github.com/kubernetes-csi/external-snapshotter/pkg/client/clientset/versioned"
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storageinformers "github.com/kubernetes-csi/external-snapshotter/pkg/client/informers/externalversions/volumesnapshot/v1beta1"
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storagelisters "github.com/kubernetes-csi/external-snapshotter/pkg/client/listers/volumesnapshot/v1beta1"
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"github.com/kubernetes-csi/external-snapshotter/pkg/snapshotter"
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"k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/kubernetes/scheme"
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corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
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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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"k8s.io/kubernetes/pkg/util/goroutinemap"
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)
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type csiSnapshotSideCarController struct {
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clientset clientset.Interface
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client kubernetes.Interface
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driverName string
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eventRecorder record.EventRecorder
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contentQueue workqueue.RateLimitingInterface
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contentLister storagelisters.VolumeSnapshotContentLister
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contentListerSynced cache.InformerSynced
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classLister storagelisters.VolumeSnapshotClassLister
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classListerSynced cache.InformerSynced
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contentStore cache.Store
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handler Handler
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// Map of scheduled/running operations.
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runningOperations goroutinemap.GoRoutineMap
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resyncPeriod time.Duration
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}
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// NewCSISnapshotSideCarController returns a new *csiSnapshotSideCarController
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func NewCSISnapshotSideCarController(
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clientset clientset.Interface,
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client kubernetes.Interface,
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driverName string,
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volumeSnapshotContentInformer storageinformers.VolumeSnapshotContentInformer,
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volumeSnapshotClassInformer storageinformers.VolumeSnapshotClassInformer,
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snapshotter snapshotter.Snapshotter,
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timeout time.Duration,
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resyncPeriod time.Duration,
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snapshotNamePrefix string,
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snapshotNameUUIDLength int,
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) *csiSnapshotSideCarController {
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broadcaster := record.NewBroadcaster()
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broadcaster.StartLogging(klog.Infof)
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broadcaster.StartRecordingToSink(&corev1.EventSinkImpl{Interface: client.CoreV1().Events(v1.NamespaceAll)})
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var eventRecorder record.EventRecorder
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eventRecorder = broadcaster.NewRecorder(scheme.Scheme, v1.EventSource{Component: fmt.Sprintf("csi-snapshotter %s", driverName)})
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ctrl := &csiSnapshotSideCarController{
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clientset: clientset,
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client: client,
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driverName: driverName,
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eventRecorder: eventRecorder,
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handler: NewCSIHandler(snapshotter, timeout, snapshotNamePrefix, snapshotNameUUIDLength),
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runningOperations: goroutinemap.NewGoRoutineMap(true),
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resyncPeriod: resyncPeriod,
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contentStore: cache.NewStore(cache.DeletionHandlingMetaNamespaceKeyFunc),
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contentQueue: workqueue.NewNamedRateLimitingQueue(workqueue.DefaultControllerRateLimiter(), "csi-snapshotter-content"),
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}
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volumeSnapshotContentInformer.Informer().AddEventHandlerWithResyncPeriod(
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cache.ResourceEventHandlerFuncs{
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AddFunc: func(obj interface{}) { ctrl.enqueueContentWork(obj) },
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UpdateFunc: func(oldObj, newObj interface{}) { ctrl.enqueueContentWork(newObj) },
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DeleteFunc: func(obj interface{}) { ctrl.enqueueContentWork(obj) },
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},
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ctrl.resyncPeriod,
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)
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ctrl.contentLister = volumeSnapshotContentInformer.Lister()
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ctrl.contentListerSynced = volumeSnapshotContentInformer.Informer().HasSynced
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ctrl.classLister = volumeSnapshotClassInformer.Lister()
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ctrl.classListerSynced = volumeSnapshotClassInformer.Informer().HasSynced
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return ctrl
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}
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func (ctrl *csiSnapshotSideCarController) Run(workers int, stopCh <-chan struct{}) {
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defer ctrl.contentQueue.ShutDown()
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klog.Infof("Starting CSI snapshotter")
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defer klog.Infof("Shutting CSI snapshotter")
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if !cache.WaitForCacheSync(stopCh, ctrl.contentListerSynced, ctrl.classListerSynced) {
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klog.Errorf("Cannot sync caches")
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return
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}
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ctrl.initializeCaches(ctrl.contentLister)
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for i := 0; i < workers; i++ {
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go wait.Until(ctrl.contentWorker, 0, stopCh)
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}
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<-stopCh
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}
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// enqueueContentWork adds snapshot content to given work queue.
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func (ctrl *csiSnapshotSideCarController) enqueueContentWork(obj interface{}) {
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// Beware of "xxx deleted" events
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if unknown, ok := obj.(cache.DeletedFinalStateUnknown); ok && unknown.Obj != nil {
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obj = unknown.Obj
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}
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if content, ok := obj.(*crdv1.VolumeSnapshotContent); ok {
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objName, err := cache.DeletionHandlingMetaNamespaceKeyFunc(content)
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if err != nil {
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klog.Errorf("failed to get key from object: %v, %v", err, content)
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return
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}
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klog.V(5).Infof("enqueued %q for sync", objName)
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ctrl.contentQueue.Add(objName)
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}
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}
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// contentWorker processes items from contentQueue. It must run only once,
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// syncContent is not assured to be reentrant.
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func (ctrl *csiSnapshotSideCarController) contentWorker() {
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workFunc := func() bool {
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keyObj, quit := ctrl.contentQueue.Get()
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if quit {
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return true
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}
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defer ctrl.contentQueue.Done(keyObj)
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key := keyObj.(string)
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klog.V(5).Infof("contentWorker[%s]", key)
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_, name, err := cache.SplitMetaNamespaceKey(key)
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if err != nil {
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klog.V(4).Infof("error getting name of snapshotContent %q to get snapshotContent from informer: %v", key, err)
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return false
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}
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content, err := ctrl.contentLister.Get(name)
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// The content still exists in informer cache, the event must have
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// been add/update/sync
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if err == nil {
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if ctrl.isDriverMatch(content) {
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ctrl.updateContentInCacheStore(content)
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}
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return false
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}
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if !errors.IsNotFound(err) {
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klog.V(2).Infof("error getting content %q from informer: %v", key, err)
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return false
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}
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// The content is not in informer cache, the event must have been
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// "delete"
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contentObj, found, err := ctrl.contentStore.GetByKey(key)
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if err != nil {
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klog.V(2).Infof("error getting content %q from cache: %v", key, err)
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return false
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}
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if !found {
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// The controller has already processed the delete event and
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// deleted the content from its cache
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klog.V(2).Infof("deletion of content %q was already processed", key)
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return false
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}
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content, ok := contentObj.(*crdv1.VolumeSnapshotContent)
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if !ok {
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klog.Errorf("expected content, got %+v", content)
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return false
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}
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ctrl.deleteContentInCacheStore(content)
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return false
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}
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for {
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if quit := workFunc(); quit {
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klog.Infof("content worker queue shutting down")
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return
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}
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}
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}
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// verify whether the driver specified in VolumeSnapshotContent matches the controller's driver name
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func (ctrl *csiSnapshotSideCarController) isDriverMatch(content *crdv1.VolumeSnapshotContent) bool {
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if content.Spec.Source.VolumeHandle == nil && content.Spec.Source.SnapshotHandle == nil {
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// Skip this snapshot content if it does not have a valid source
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return false
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}
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if content.Spec.Driver != ctrl.driverName {
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// Skip this snapshot content if the driver does not match
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return false
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}
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snapshotClassName := content.Spec.VolumeSnapshotClassName
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if snapshotClassName != nil {
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if snapshotClass, err := ctrl.classLister.Get(*snapshotClassName); err == nil {
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if snapshotClass.Driver != ctrl.driverName {
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return false
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}
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}
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}
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return true
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}
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// updateContent runs in worker thread and handles "content added",
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// "content updated" and "periodic sync" events.
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func (ctrl *csiSnapshotSideCarController) updateContentInCacheStore(content *crdv1.VolumeSnapshotContent) {
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// Store the new content version in the cache and do not process it if this is
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// an old version.
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new, err := ctrl.storeContentUpdate(content)
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if err != nil {
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klog.Errorf("%v", err)
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}
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if !new {
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return
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}
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err = ctrl.syncContent(content)
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if err != nil {
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if errors.IsConflict(err) {
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// Version conflict error happens quite often and the controller
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// recovers from it easily.
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klog.V(3).Infof("could not sync content %q: %+v", content.Name, err)
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} else {
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klog.Errorf("could not sync content %q: %+v", content.Name, err)
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}
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}
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}
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// deleteContent runs in worker thread and handles "content deleted" event.
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func (ctrl *csiSnapshotSideCarController) deleteContentInCacheStore(content *crdv1.VolumeSnapshotContent) {
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_ = ctrl.contentStore.Delete(content)
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klog.V(4).Infof("content %q deleted", content.Name)
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}
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// initializeCaches fills all controller caches with initial data from etcd in
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// order to have the caches already filled when first addSnapshot/addContent to
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// perform initial synchronization of the controller.
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func (ctrl *csiSnapshotSideCarController) initializeCaches(contentLister storagelisters.VolumeSnapshotContentLister) {
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contentList, err := contentLister.List(labels.Everything())
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if err != nil {
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klog.Errorf("CSISnapshotController can't initialize caches: %v", err)
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return
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}
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for _, content := range contentList {
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if ctrl.isDriverMatch(content) {
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contentClone := content.DeepCopy()
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if _, err = ctrl.storeContentUpdate(contentClone); err != nil {
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klog.Errorf("error updating volume snapshot content cache: %v", err)
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}
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}
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}
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klog.V(4).Infof("controller initialized")
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}
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