Added create group volume snapshot functionality
This commit is contained in:
Raunak Pradip Shah
@@ -17,11 +17,19 @@ limitations under the License.
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package sidecar_controller
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import (
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"context"
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"crypto/sha256"
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"fmt"
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"time"
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v1 "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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"k8s.io/client-go/tools/cache"
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klog "k8s.io/klog/v2"
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crdv1alpha1 "github.com/kubernetes-csi/external-snapshotter/client/v6/apis/volumegroupsnapshot/v1alpha1"
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crdv1 "github.com/kubernetes-csi/external-snapshotter/client/v6/apis/volumesnapshot/v1"
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"github.com/kubernetes-csi/external-snapshotter/v6/pkg/utils"
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)
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@@ -159,12 +167,477 @@ func (ctrl *csiSnapshotSideCarController) syncGroupSnapshotContent(content *crdv
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TODO: Check if the group snapshot content should be deleted
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*/
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/*
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TODO: Check if a new group snapshot should be created by calling CreateGroupSnapshot
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*/
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if len(content.Spec.Source.PersistentVolumeNames) != 0 && content.Status == nil {
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klog.V(5).Infof("syncContent: Call CreateGroupSnapshot for group snapshot content %s", content.Name)
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return ctrl.createGroupSnapshot(content)
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}
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// Skip checkandUpdateGroupSnapshotContentStatus() if ReadyToUse is already
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// true. We don't want to keep calling CreateGroupSnapshot CSI methods over
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// and over again for performance reasons.
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var err error
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if content.Status != nil && content.Status.ReadyToUse != nil && *content.Status.ReadyToUse == true {
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// Try to remove AnnVolumeGroupSnapshotBeingCreated if it is not removed yet for some reason
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_, err = ctrl.removeAnnVolumeGroupSnapshotBeingCreated(content)
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return err
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}
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return ctrl.checkandUpdateGroupSnapshotContentStatus(content)
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}
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// createGroupSnapshot starts new asynchronous operation to create group snapshot
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func (ctrl *csiSnapshotSideCarController) createGroupSnapshot(content *crdv1alpha1.VolumeGroupSnapshotContent) error {
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klog.V(5).Infof("createGroupSnapshot for group snapshot content [%s]: started", content.Name)
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contentObj, err := ctrl.createGroupSnapshotWrapper(content)
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if err != nil {
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ctrl.updateGroupSnapshotContentErrorStatusWithEvent(contentObj, v1.EventTypeWarning, "SnapshotCreationFailed", fmt.Sprintf("Failed to create group snapshot: %v", err))
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klog.Errorf("createSnapshot for content [%s]: error occurred in createSnapshotWrapper: %v", content.Name, err)
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return err
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}
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_, updateErr := ctrl.storeGroupSnapshotContentUpdate(contentObj)
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if updateErr != nil {
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// We will get a "group snapshot update" event soon, this is not a big error
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klog.V(4).Infof("createSnapshot for content [%s]: cannot update internal content cache: %v", content.Name, updateErr)
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}
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/*
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TODO: Check and update group snapshot content status
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*/
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return nil
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}
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// This is a wrapper function for the group snapshot creation process.
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func (ctrl *csiSnapshotSideCarController) createGroupSnapshotWrapper(content *crdv1alpha1.VolumeGroupSnapshotContent) (*crdv1alpha1.VolumeGroupSnapshotContent, error) {
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klog.Infof("createGroupSnapshotWrapper: Creating group snapshot for group snapshot content %s through the plugin ...", content.Name)
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class, snapshotterCredentials, err := ctrl.getCSIGroupSnapshotInput(content)
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if err != nil {
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return content, fmt.Errorf("failed to get input parameters to create group snapshot for content %s: %q", content.Name, err)
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}
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// NOTE(xyang): handle create timeout
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// Add an annotation to indicate the group snapshot creation request has been
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// sent to the storage system and the controller is waiting for a response.
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// The annotation will be removed after the storage system has responded with
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// success or permanent failure. If the request times out, annotation will
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// remain on the content to avoid potential leaking of a group snapshot resource on
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// the storage system.
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content, err = ctrl.setAnnVolumeGroupSnapshotBeingCreated(content)
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if err != nil {
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return content, fmt.Errorf("failed to add VolumeGroupSnapshotBeingCreated annotation on the content %s: %q", content.Name, err)
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}
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parameters, err := utils.RemovePrefixedParameters(class.Parameters)
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if err != nil {
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return content, fmt.Errorf("failed to remove CSI Parameters of prefixed keys: %v", err)
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}
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if ctrl.extraCreateMetadata {
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parameters[utils.PrefixedVolumeGroupSnapshotNameKey] = content.Spec.VolumeGroupSnapshotRef.Name
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parameters[utils.PrefixedVolumeGroupSnapshotNamespaceKey] = content.Spec.VolumeGroupSnapshotRef.Namespace
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parameters[utils.PrefixedVolumeGroupSnapshotContentNameKey] = content.Name
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}
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volumeIDs, err := ctrl.getGroupSnapshotVolumeIDs(content)
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driverName, groupSnapshotID, snapshots, creationTime, readyToUse, err := ctrl.handler.CreateGroupSnapshot(content, volumeIDs, parameters, snapshotterCredentials)
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if err != nil {
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// NOTE(xyang): handle create timeout
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// If it is a final error, remove annotation to indicate
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// storage system has responded with an error
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klog.Infof("createSnapshotWrapper: CreateSnapshot for content %s returned error: %v", content.Name, err)
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if isCSIFinalError(err) {
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var removeAnnotationErr error
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if content, removeAnnotationErr = ctrl.removeAnnVolumeGroupSnapshotBeingCreated(content); removeAnnotationErr != nil {
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return content, fmt.Errorf("failed to remove VolumeGroupSnapshotBeingCreated annotation from the content %s: %s", content.Name, removeAnnotationErr)
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}
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}
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return content, fmt.Errorf("failed to take group snapshot of the volumes %s: %q", content.Spec.Source.PersistentVolumeNames, err)
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}
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klog.V(5).Infof("Created group snapshot: driver %s, groupSnapshotId %s, creationTime %v, readyToUse %t", driverName, groupSnapshotID, creationTime, readyToUse)
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if creationTime.IsZero() {
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creationTime = time.Now()
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}
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// Create individual snapshots and snapshot contents
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for _, snapshot := range snapshots {
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volumeSnapshotContentName := GetSnapshotContentNameForVolumeGroupSnapshotContent(content)
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volumeSnapshotName := GetSnapshotNameForVolumeGroupSnapshotContent(content)
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volumeSnapshotNamespace := content.Spec.VolumeGroupSnapshotRef.Namespace
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volumeSnapshotContent := &crdv1.VolumeSnapshotContent{
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ObjectMeta: metav1.ObjectMeta{
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Name: volumeSnapshotContentName,
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},
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Spec: crdv1.VolumeSnapshotContentSpec{
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VolumeSnapshotRef: v1.ObjectReference{
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Kind: "VolumeSnapshots",
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Name: volumeSnapshotName,
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Namespace: volumeSnapshotNamespace,
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},
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DeletionPolicy: content.Spec.DeletionPolicy,
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Driver: content.Spec.Driver,
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Source: crdv1.VolumeSnapshotContentSource{
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SnapshotHandle: &snapshot.SnapshotId,
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},
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SourceVolumeMode: nil,
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},
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}
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volumeSnapshot := &crdv1.VolumeSnapshot{
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ObjectMeta: metav1.ObjectMeta{
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Name: volumeSnapshotName,
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Namespace: volumeSnapshotNamespace,
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},
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Spec: crdv1.VolumeSnapshotSpec{
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Source: crdv1.VolumeSnapshotSource{
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VolumeSnapshotContentName: &volumeSnapshotContentName,
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},
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},
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}
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_, err = ctrl.clientset.SnapshotV1().VolumeSnapshotContents().Create(context.TODO(), volumeSnapshotContent, metav1.CreateOptions{})
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if err != nil {
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return content, err
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}
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_, err = ctrl.clientset.SnapshotV1().VolumeSnapshots(volumeSnapshotNamespace).Create(context.TODO(), volumeSnapshot, metav1.CreateOptions{})
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if err != nil {
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return content, err
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}
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}
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newContent, err := ctrl.updateGroupSnapshotContentStatus(content, groupSnapshotID, readyToUse, creationTime.UnixNano())
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if err != nil {
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klog.Errorf("error updating status for volume group snapshot content %s: %v.", content.Name, err)
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return content, fmt.Errorf("error updating status for volume group snapshot content %s: %v", content.Name, err)
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}
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content = newContent
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// NOTE(xyang): handle create timeout
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// Remove annotation to indicate storage system has successfully
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// cut the group snapshot
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content, err = ctrl.removeAnnVolumeGroupSnapshotBeingCreated(content)
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if err != nil {
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return content, fmt.Errorf("failed to remove VolumeGroupSnapshotBeingCreated annotation on the content %s: %q", content.Name, err)
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}
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return content, nil
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}
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func (ctrl *csiSnapshotSideCarController) getCSIGroupSnapshotInput(content *crdv1alpha1.VolumeGroupSnapshotContent) (*crdv1alpha1.VolumeGroupSnapshotClass, map[string]string, error) {
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className := content.Spec.VolumeGroupSnapshotClassName
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klog.V(5).Infof("getCSIGroupSnapshotInput for group snapshot content [%s]", content.Name)
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var class *crdv1alpha1.VolumeGroupSnapshotClass
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var err error
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if className != nil {
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class, err = ctrl.getGroupSnapshotClass(*className)
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if err != nil {
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klog.Errorf("getCSISnapshotInput failed to getClassFromVolumeGroupSnapshot %s", err)
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return nil, nil, err
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}
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} else {
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// If dynamic provisioning, return failure if no group snapshot class
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if len(content.Spec.Source.PersistentVolumeNames) != 0 {
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klog.Errorf("failed to getCSISnapshotInput %s without a group snapshot class", content.Name)
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return nil, nil, fmt.Errorf("failed to take group snapshot %s without a group snapshot class", content.Name)
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}
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// For pre-provisioned group snapshot, group snapshot class is not required
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klog.V(5).Infof("getCSISnapshotInput for content [%s]: no VolumeGroupSnapshotClassName provided for pre-provisioned group snapshot", content.Name)
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}
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// TODO: Resolve snapshotting secret credentials.
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return class, nil, nil
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}
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// getGroupSnapshotClass is a helper function to get group snapshot class from the class name.
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func (ctrl *csiSnapshotSideCarController) getGroupSnapshotClass(className string) (*crdv1alpha1.VolumeGroupSnapshotClass, error) {
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klog.V(5).Infof("getGroupSnapshotClass: VolumeGroupSnapshotClassName [%s]", className)
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class, err := ctrl.groupSnapshotClassLister.Get(className)
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if err != nil {
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klog.Errorf("failed to retrieve group snapshot class %s from the informer: %q", className, err)
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return nil, err
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}
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return class, nil
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}
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// setAnnVolumeGroupSnapshotBeingCreated sets VolumeGroupSnapshotBeingCreated annotation
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// on VolumeGroupSnapshotContent
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// If set, it indicates group snapshot is being created
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func (ctrl *csiSnapshotSideCarController) setAnnVolumeGroupSnapshotBeingCreated(content *crdv1alpha1.VolumeGroupSnapshotContent) (*crdv1alpha1.VolumeGroupSnapshotContent, error) {
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if metav1.HasAnnotation(content.ObjectMeta, utils.AnnVolumeGroupSnapshotBeingCreated) {
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// the annotation already exists, return directly
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return content, nil
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}
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// Set AnnVolumeGroupSnapshotBeingCreated
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// Combine existing annotations with the new annotations.
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// If there are no existing annotations, we create a new map.
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klog.V(5).Infof("setAnnVolumeGroupSnapshotBeingCreated: set annotation [%s:yes] on content [%s].", utils.AnnVolumeGroupSnapshotBeingCreated, content.Name)
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patchedAnnotations := make(map[string]string)
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for k, v := range content.GetAnnotations() {
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patchedAnnotations[k] = v
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}
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patchedAnnotations[utils.AnnVolumeGroupSnapshotBeingCreated] = "yes"
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var patches []utils.PatchOp
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patches = append(patches, utils.PatchOp{
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Op: "replace",
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Path: "/metadata/annotations",
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Value: patchedAnnotations,
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})
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patchedContent, err := utils.PatchVolumeGroupSnapshotContent(content, patches, ctrl.clientset)
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if err != nil {
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return content, newControllerUpdateError(content.Name, err.Error())
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}
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// update content if update is successful
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content = patchedContent
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_, err = ctrl.storeContentUpdate(content)
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if err != nil {
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klog.V(4).Infof("setAnnVolumeGroupSnapshotBeingCreated for content [%s]: cannot update internal cache %v", content.Name, err)
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}
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klog.V(5).Infof("setAnnVolumeGroupSnapshotBeingCreated: volume group snapshot content %+v", content)
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return content, nil
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}
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func (ctrl *csiSnapshotSideCarController) getGroupSnapshotVolumeIDs(content *crdv1alpha1.VolumeGroupSnapshotContent) ([]string, error) {
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// TODO: Get add PV lister
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var volumeIDs []string
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for _, pvName := range content.Spec.Source.PersistentVolumeNames {
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pv, err := ctrl.client.CoreV1().PersistentVolumes().Get(context.TODO(), pvName, metav1.GetOptions{})
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if err != nil {
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return nil, err
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}
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if pv.Spec.CSI != nil && pv.Spec.CSI.VolumeHandle != "" {
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volumeIDs = append(volumeIDs, pv.Spec.CSI.VolumeHandle)
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}
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}
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return volumeIDs, nil
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}
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// removeAnnVolumeGroupSnapshotBeingCreated removes the VolumeGroupSnapshotBeingCreated
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// annotation from a content if there exists one.
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func (ctrl csiSnapshotSideCarController) removeAnnVolumeGroupSnapshotBeingCreated(content *crdv1alpha1.VolumeGroupSnapshotContent) (*crdv1alpha1.VolumeGroupSnapshotContent, error) {
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if !metav1.HasAnnotation(content.ObjectMeta, utils.AnnVolumeGroupSnapshotBeingCreated) {
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// the annotation does not exist, return directly
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return content, nil
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}
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contentClone := content.DeepCopy()
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delete(contentClone.ObjectMeta.Annotations, utils.AnnVolumeGroupSnapshotBeingCreated)
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updatedContent, err := ctrl.clientset.GroupsnapshotV1alpha1().VolumeGroupSnapshotContents().Update(context.TODO(), contentClone, metav1.UpdateOptions{})
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if err != nil {
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return content, newControllerUpdateError(content.Name, err.Error())
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}
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klog.V(5).Infof("Removed VolumeGroupSnapshotBeingCreated annotation from volume group snapshot content %s", content.Name)
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_, err = ctrl.storeContentUpdate(updatedContent)
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if err != nil {
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klog.Errorf("failed to update content store %v", err)
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}
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return updatedContent, nil
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}
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func (ctrl *csiSnapshotSideCarController) updateGroupSnapshotContentStatus(
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content *crdv1alpha1.VolumeGroupSnapshotContent,
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groupSnapshotHandle string,
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readyToUse bool,
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createdAt int64) (*crdv1alpha1.VolumeGroupSnapshotContent, error) {
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klog.V(5).Infof("updateSnapshotContentStatus: updating VolumeGroupSnapshotContent [%s], groupSnapshotHandle %s, readyToUse %v, createdAt %v", content.Name, groupSnapshotHandle, readyToUse, createdAt)
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contentObj, err := ctrl.clientset.GroupsnapshotV1alpha1().VolumeGroupSnapshotContents().Get(context.TODO(), content.Name, metav1.GetOptions{})
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if err != nil {
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return nil, fmt.Errorf("error get group snapshot content %s from api server: %v", content.Name, err)
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}
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var newStatus *crdv1alpha1.VolumeGroupSnapshotContentStatus
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updated := false
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if contentObj.Status == nil {
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newStatus = &crdv1alpha1.VolumeGroupSnapshotContentStatus{
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VolumeGroupSnapshotHandle: &groupSnapshotHandle,
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ReadyToUse: &readyToUse,
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CreationTime: &createdAt,
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}
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updated = true
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} else {
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newStatus = contentObj.Status.DeepCopy()
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if newStatus.VolumeGroupSnapshotHandle == nil {
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newStatus.VolumeGroupSnapshotHandle = &groupSnapshotHandle
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updated = true
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}
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if newStatus.ReadyToUse == nil || *newStatus.ReadyToUse != readyToUse {
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newStatus.ReadyToUse = &readyToUse
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updated = true
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if readyToUse && newStatus.Error != nil {
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newStatus.Error = nil
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}
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}
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if newStatus.CreationTime == nil {
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newStatus.CreationTime = &createdAt
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updated = true
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}
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}
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if updated {
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contentClone := contentObj.DeepCopy()
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contentClone.Status = newStatus
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newContent, err := ctrl.clientset.GroupsnapshotV1alpha1().VolumeGroupSnapshotContents().UpdateStatus(context.TODO(), contentClone, metav1.UpdateOptions{})
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if err != nil {
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return contentObj, newControllerUpdateError(content.Name, err.Error())
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}
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return newContent, nil
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}
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return contentObj, nil
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}
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// updateContentStatusWithEvent saves new content.Status to API server and emits
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// given event on the content. It saves the status and emits the event only when
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// the status has actually changed from the version saved in API server.
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// Parameters:
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//
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// * content - content to update
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// * eventtype, reason, message - event to send, see EventRecorder.Event()
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func (ctrl *csiSnapshotSideCarController) updateGroupSnapshotContentErrorStatusWithEvent(content *crdv1alpha1.VolumeGroupSnapshotContent, eventtype, reason, message string) error {
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klog.V(5).Infof("updateContentStatusWithEvent[%s]", content.Name)
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if content.Status != nil && content.Status.Error != nil && *content.Status.Error.Message == message {
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klog.V(4).Infof("updateContentStatusWithEvent[%s]: the same error %v is already set", content.Name, content.Status.Error)
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return nil
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}
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var patches []utils.PatchOp
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ready := false
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contentStatusError := &crdv1.VolumeSnapshotError{
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Time: &metav1.Time{
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Time: time.Now(),
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},
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Message: &message,
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}
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if content.Status == nil {
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// Initialize status if nil
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patches = append(patches, utils.PatchOp{
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Op: "replace",
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Path: "/status",
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Value: &crdv1alpha1.VolumeGroupSnapshotContentStatus{
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ReadyToUse: &ready,
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Error: contentStatusError,
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},
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})
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} else {
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// Patch status if non-nil
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patches = append(patches, utils.PatchOp{
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Op: "replace",
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Path: "/status/error",
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Value: contentStatusError,
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})
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patches = append(patches, utils.PatchOp{
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Op: "replace",
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Path: "/status/readyToUse",
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Value: &ready,
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})
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}
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newContent, err := utils.PatchVolumeGroupSnapshotContent(content, patches, ctrl.clientset, "status")
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// Emit the event even if the status update fails so that user can see the error
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ctrl.eventRecorder.Event(newContent, eventtype, reason, message)
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if err != nil {
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klog.V(4).Infof("updating VolumeGroupSnapshotContent[%s] error status failed %v", content.Name, err)
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return err
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}
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_, err = ctrl.storeGroupSnapshotContentUpdate(newContent)
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if err != nil {
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klog.V(4).Infof("updating VolumeGroupSnapshotContent[%s] error status: cannot update internal cache %v", content.Name, 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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// GetSnapshotNameForVolumeGroupSnapshotContent returns a unique snapshot name for a VolumeGroupSnapshotContent.
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func GetSnapshotNameForVolumeGroupSnapshotContent(content *crdv1alpha1.VolumeGroupSnapshotContent) string {
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return fmt.Sprintf("groupsnapshot-%x-%d", sha256.Sum256([]byte(content.UID)), time.Duration(time.Now().UnixNano())/time.Millisecond)
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}
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|
||||
// GetSnapshotContentNameForVolumeGroupSnapshotContent returns a unique content name for the
|
||||
// passed in VolumeGroupSnapshotContent.
|
||||
func GetSnapshotContentNameForVolumeGroupSnapshotContent(content *crdv1alpha1.VolumeGroupSnapshotContent) string {
|
||||
return fmt.Sprintf("groupsnapcontent-%x-%d", sha256.Sum256([]byte(content.UID)), time.Duration(time.Now().UnixNano())/time.Millisecond)
|
||||
}
|
||||
|
||||
func (ctrl *csiSnapshotSideCarController) checkandUpdateGroupSnapshotContentStatus(content *crdv1alpha1.VolumeGroupSnapshotContent) error {
|
||||
klog.V(5).Infof("checkandUpdateGroupSnapshotContentStatus[%s] started", content.Name)
|
||||
contentObj, err := ctrl.checkandUpdateGroupSnapshotContentStatusOperation(content)
|
||||
if err != nil {
|
||||
ctrl.updateGroupSnapshotContentErrorStatusWithEvent(contentObj, v1.EventTypeWarning, "GroupSnapshotContentCheckandUpdateFailed", fmt.Sprintf("Failed to check and update group snapshot content: %v", err))
|
||||
klog.Errorf("checkandUpdateGroupSnapshotContentStatus [%s]: error occurred %v", content.Name, err)
|
||||
return err
|
||||
}
|
||||
_, updateErr := ctrl.storeGroupSnapshotContentUpdate(contentObj)
|
||||
if updateErr != nil {
|
||||
// We will get a "group snapshot update" event soon, this is not a big error
|
||||
klog.V(4).Infof("checkandUpdateGroupSnapshotContentStatus [%s]: cannot update internal cache: %v", content.Name, updateErr)
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func (ctrl *csiSnapshotSideCarController) checkandUpdateGroupSnapshotContentStatusOperation(content *crdv1alpha1.VolumeGroupSnapshotContent) (*crdv1alpha1.VolumeGroupSnapshotContent, error) {
|
||||
var err error
|
||||
var creationTime time.Time
|
||||
readyToUse := false
|
||||
var driverName string
|
||||
var groupSnapshotID string
|
||||
var snapshotterListCredentials map[string]string
|
||||
|
||||
if content.Spec.Source.VolumeGroupSnapshotHandle != nil {
|
||||
klog.V(5).Infof("checkandUpdateGroupSnapshotContentStatusOperation: call GetSnapshotStatus for group snapshot which is pre-bound to content [%s]", content.Name)
|
||||
|
||||
if content.Spec.VolumeGroupSnapshotClassName != nil {
|
||||
class, err := ctrl.getGroupSnapshotClass(*content.Spec.VolumeGroupSnapshotClassName)
|
||||
if err != nil {
|
||||
klog.Errorf("Failed to get group snapshot class %s for group snapshot content %s: %v", *content.Spec.VolumeGroupSnapshotClassName, content.Name, err)
|
||||
return content, fmt.Errorf("failed to get group snapshot class %s for group snapshot content %s: %v", *content.Spec.VolumeGroupSnapshotClassName, content.Name, err)
|
||||
}
|
||||
|
||||
snapshotterListSecretRef, err := utils.GetSecretReference(utils.SnapshotterListSecretParams, class.Parameters, content.GetObjectMeta().GetName(), nil)
|
||||
if err != nil {
|
||||
klog.Errorf("Failed to get secret reference for group snapshot content %s: %v", content.Name, err)
|
||||
return content, fmt.Errorf("failed to get secret reference for group snapshot content %s: %v", content.Name, err)
|
||||
}
|
||||
|
||||
snapshotterListCredentials, err = utils.GetCredentials(ctrl.client, snapshotterListSecretRef)
|
||||
if err != nil {
|
||||
// Continue with deletion, as the secret may have already been deleted.
|
||||
klog.Errorf("Failed to get credentials for group snapshot content %s: %v", content.Name, err)
|
||||
return content, fmt.Errorf("failed to get credentials for group snapshot content %s: %v", content.Name, err)
|
||||
}
|
||||
}
|
||||
|
||||
readyToUse, creationTime, err = ctrl.handler.GetGroupSnapshotStatus(content, snapshotterListCredentials)
|
||||
if err != nil {
|
||||
klog.Errorf("checkandUpdateGroupSnapshotContentStatusOperation: failed to call get group snapshot status to check whether group snapshot is ready to use %q", err)
|
||||
return content, err
|
||||
}
|
||||
driverName = content.Spec.Driver
|
||||
groupSnapshotID = *content.Spec.Source.VolumeGroupSnapshotHandle
|
||||
|
||||
klog.V(5).Infof("checkandUpdateGroupSnapshotContentStatusOperation: driver %s, groupSnapshotId %s, creationTime %v, size %d, readyToUse %t", driverName, groupSnapshotID, creationTime, readyToUse)
|
||||
|
||||
if creationTime.IsZero() {
|
||||
creationTime = time.Now()
|
||||
}
|
||||
|
||||
updatedContent, err := ctrl.updateGroupSnapshotContentStatus(content, groupSnapshotID, readyToUse, creationTime.UnixNano())
|
||||
if err != nil {
|
||||
return content, err
|
||||
}
|
||||
return updatedContent, nil
|
||||
}
|
||||
return ctrl.createGroupSnapshotWrapper(content)
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user