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smart-clone-controller.go
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smart-clone-controller.go
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package controller
import (
"context"
"fmt"
"reflect"
"github.com/go-logr/logr"
snapshotv1 "github.com/kubernetes-csi/external-snapshotter/v2/pkg/apis/volumesnapshot/v1beta1"
"github.com/pkg/errors"
corev1 "k8s.io/api/core/v1"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/tools/record"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller"
"sigs.k8s.io/controller-runtime/pkg/event"
"sigs.k8s.io/controller-runtime/pkg/handler"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/predicate"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
cdiv1 "kubevirt.io/containerized-data-importer/pkg/apis/core/v1beta1"
"kubevirt.io/containerized-data-importer/pkg/common"
)
const (
//AnnSmartCloneRequest sets our expected annotation for a CloneRequest
AnnSmartCloneRequest = "k8s.io/SmartCloneRequest"
)
// SmartCloneReconciler members
type SmartCloneReconciler struct {
client client.Client
recorder record.EventRecorder
scheme *runtime.Scheme
log logr.Logger
}
// NewSmartCloneController creates a new instance of the Smart clone controller.
func NewSmartCloneController(mgr manager.Manager, log logr.Logger) (controller.Controller, error) {
reconciler := &SmartCloneReconciler{
client: mgr.GetClient(),
scheme: mgr.GetScheme(),
log: log.WithName("smartclone-controller"),
recorder: mgr.GetEventRecorderFor("smartclone-controller"),
}
smartCloneController, err := controller.New("smartclone-controller", mgr, controller.Options{
Reconciler: reconciler,
})
if err != nil {
return nil, err
}
if err := addSmartCloneControllerWatches(mgr, smartCloneController); err != nil {
return nil, err
}
return smartCloneController, nil
}
func addSmartCloneControllerWatches(mgr manager.Manager, smartCloneController controller.Controller) error {
// Add schemes.
if err := cdiv1.AddToScheme(mgr.GetScheme()); err != nil {
return err
}
if err := snapshotv1.AddToScheme(mgr.GetScheme()); err != nil {
return err
}
// Setup watches
if err := smartCloneController.Watch(&source.Kind{Type: &corev1.PersistentVolumeClaim{}}, &handler.EnqueueRequestForOwner{
OwnerType: &cdiv1.DataVolume{},
IsController: true,
}, predicate.Funcs{
CreateFunc: func(e event.CreateEvent) bool {
return shouldReconcilePvc(e.Object.(*corev1.PersistentVolumeClaim))
},
UpdateFunc: func(e event.UpdateEvent) bool {
return shouldReconcilePvc(e.ObjectNew.(*corev1.PersistentVolumeClaim))
},
DeleteFunc: func(e event.DeleteEvent) bool {
return shouldReconcilePvc(e.Object.(*corev1.PersistentVolumeClaim))
},
GenericFunc: func(e event.GenericEvent) bool {
return shouldReconcilePvc(e.Object.(*corev1.PersistentVolumeClaim))
},
}); err != nil {
return err
}
// check if volume snapshots exist
err := mgr.GetClient().List(context.TODO(), &snapshotv1.VolumeSnapshotList{})
if meta.IsNoMatchError(err) {
return nil
}
if err != nil && !isErrCacheNotStarted(err) {
return err
}
if err := smartCloneController.Watch(&source.Kind{Type: &snapshotv1.VolumeSnapshot{}}, &handler.EnqueueRequestForOwner{
OwnerType: &cdiv1.DataVolume{},
IsController: true,
}, predicate.Funcs{
CreateFunc: func(e event.CreateEvent) bool {
return shouldReconcileSnapshot(e.Object.(*snapshotv1.VolumeSnapshot))
},
UpdateFunc: func(e event.UpdateEvent) bool {
return shouldReconcileSnapshot(e.ObjectNew.(*snapshotv1.VolumeSnapshot))
},
DeleteFunc: func(e event.DeleteEvent) bool {
return shouldReconcileSnapshot(e.Object.(*snapshotv1.VolumeSnapshot))
},
GenericFunc: func(e event.GenericEvent) bool {
return shouldReconcileSnapshot(e.Object.(*snapshotv1.VolumeSnapshot))
},
}); err != nil {
return err
}
return nil
}
func shouldReconcileSnapshot(snapshot *snapshotv1.VolumeSnapshot) bool {
_, ok := snapshot.GetAnnotations()[AnnSmartCloneRequest]
if !ok {
return false
}
return snapshot.Status != nil && snapshot.Status.ReadyToUse != nil && *snapshot.Status.ReadyToUse
}
func shouldReconcilePvc(pvc *corev1.PersistentVolumeClaim) bool {
if pvc.Status.Phase == corev1.ClaimLost {
return false
}
val, ok := pvc.GetAnnotations()[AnnSmartCloneRequest]
return ok && val == "true"
}
// Reconcile the reconcile loop for smart cloning.
func (r *SmartCloneReconciler) Reconcile(req reconcile.Request) (reconcile.Result, error) {
log := r.log.WithValues("Datavolume", req.NamespacedName)
log.Info("reconciling smart clone")
pvc := &corev1.PersistentVolumeClaim{}
if err := r.client.Get(context.TODO(), req.NamespacedName, pvc); err != nil {
if k8serrors.IsNotFound(err) {
// PVC not found, look up smart clone.
snapshot := &snapshotv1.VolumeSnapshot{}
if err := r.client.Get(context.TODO(), req.NamespacedName, snapshot); err != nil {
if k8serrors.IsNotFound(err) {
return reconcile.Result{}, nil
}
return reconcile.Result{}, err
}
return r.reconcileSnapshot(log, snapshot)
}
return reconcile.Result{}, err
}
return r.reconcilePvc(log, pvc)
}
func (r *SmartCloneReconciler) reconcilePvc(log logr.Logger, pvc *corev1.PersistentVolumeClaim) (reconcile.Result, error) {
log.WithValues("pvc.Name", pvc.Name).WithValues("pvc.Namespace", pvc.Namespace).Info("PVC created from snapshot, updating datavolume status")
snapshotName := pvc.Spec.DataSource.Name
datavolume := &cdiv1.DataVolume{}
if err := r.client.Get(context.TODO(), types.NamespacedName{Name: snapshotName, Namespace: pvc.Namespace}, datavolume); err != nil {
return reconcile.Result{}, err
}
// Update DV phase and emit PVC in progress event
if err := r.updateSmartCloneStatusPhase(cdiv1.Succeeded, datavolume, pvc); err != nil {
// Have not properly updated the data volume status, don't delete the snapshot so we retry.
log.Error(err, "error updating datavolume with success")
return reconcile.Result{}, err
}
// Don't delete snapshot unless the PVC is bound.
if pvc.Status.Phase == corev1.ClaimBound {
snapshotToDelete := &snapshotv1.VolumeSnapshot{}
if err := r.client.Get(context.TODO(), types.NamespacedName{Name: snapshotName, Namespace: pvc.Namespace}, snapshotToDelete); err != nil {
if k8serrors.IsNotFound(err) {
// Already gone, so no need to try a delete.
return reconcile.Result{}, nil
}
return reconcile.Result{}, err
}
if err := r.client.Delete(context.TODO(), snapshotToDelete); err != nil {
if !k8serrors.IsNotFound(err) {
log.Error(err, "error deleting snapshot for smart-clone")
return reconcile.Result{}, err
}
}
log.V(3).Info("Snapshot deleted")
}
return reconcile.Result{}, nil
}
func (r *SmartCloneReconciler) reconcileSnapshot(log logr.Logger, snapshot *snapshotv1.VolumeSnapshot) (reconcile.Result, error) {
log.WithValues("snapshot.Name", snapshot.Name).WithValues("snapshot.Namespace", snapshot.Namespace).Info("Updating datavolume status using snapshot")
datavolume := &cdiv1.DataVolume{}
if err := r.client.Get(context.TODO(), types.NamespacedName{Name: snapshot.Name, Namespace: snapshot.Namespace}, datavolume); err != nil {
return reconcile.Result{}, err
}
// Update DV phase and emit PVC in progress event
if err := r.updateSmartCloneStatusPhase(SmartClonePVCInProgress, datavolume, nil); err != nil {
// Have not properly updated the data volume status, don't delete the snapshot so we retry.
log.Error(err, "error updating datavolume with success")
return reconcile.Result{}, err
}
newPvc := newPvcFromSnapshot(snapshot, datavolume)
if newPvc == nil {
return reconcile.Result{}, errors.New("error creating new pvc from snapshot object, snapshot has no owner")
}
log.V(3).Info("Creating PVC from snapshot", "pvc.Namespace", newPvc.Namespace, "pvc.Name", newPvc.Name)
if err := r.client.Create(context.TODO(), newPvc); err != nil {
log.Error(err, "error creating pvc from snapshot")
return reconcile.Result{}, err
}
return reconcile.Result{}, nil
}
func (r *SmartCloneReconciler) updateSmartCloneStatusPhase(phase cdiv1.DataVolumePhase, dataVolume *cdiv1.DataVolume, newPVC *corev1.PersistentVolumeClaim) error {
var dataVolumeCopy = dataVolume.DeepCopy()
var event DataVolumeEvent
switch phase {
case cdiv1.SmartClonePVCInProgress:
dataVolumeCopy.Status.Phase = cdiv1.SmartClonePVCInProgress
event.eventType = corev1.EventTypeNormal
event.reason = SmartClonePVCInProgress
event.message = fmt.Sprintf(MessageSmartClonePVCInProgress, dataVolumeCopy.Spec.Source.PVC.Namespace, dataVolumeCopy.Spec.Source.PVC.Name)
dataVolume.Status.Conditions = updateBoundCondition(dataVolume.Status.Conditions, newPVC)
dataVolume.Status.Conditions = updateReadyCondition(dataVolume.Status.Conditions, corev1.ConditionFalse, "", "")
dataVolume.Status.Conditions = updateCondition(dataVolume.Status.Conditions, cdiv1.DataVolumeRunning, corev1.ConditionTrue, MessageSmartClonePVCInProgress, SmartClonePVCInProgress)
case cdiv1.Succeeded:
dataVolumeCopy.Status.Phase = cdiv1.Succeeded
event.eventType = corev1.EventTypeNormal
event.reason = CloneSucceeded
event.message = fmt.Sprintf(MessageCloneSucceeded, dataVolumeCopy.Spec.Source.PVC.Namespace, dataVolumeCopy.Spec.Source.PVC.Name, newPVC.Namespace, newPVC.Name)
dataVolume.Status.Conditions = updateBoundCondition(dataVolume.Status.Conditions, newPVC)
dataVolume.Status.Conditions = updateReadyCondition(dataVolume.Status.Conditions, corev1.ConditionTrue, "", "")
dataVolume.Status.Conditions = updateCondition(dataVolume.Status.Conditions, cdiv1.DataVolumeRunning, corev1.ConditionFalse, cloneComplete, "Completed")
}
return r.emitEvent(dataVolume, dataVolumeCopy, &event, newPVC)
}
func (r *SmartCloneReconciler) emitEvent(dataVolume *cdiv1.DataVolume, dataVolumeCopy *cdiv1.DataVolume, event *DataVolumeEvent, newPVC *corev1.PersistentVolumeClaim) error {
// Only update the object if something actually changed in the status.
if !reflect.DeepEqual(dataVolume.Status, dataVolumeCopy.Status) {
if err := r.client.Update(context.TODO(), dataVolumeCopy); err == nil {
// Emit the event only when the status change happens, not every time
if event.eventType != "" {
r.recorder.Event(dataVolume, event.eventType, event.reason, event.message)
}
} else {
return err
}
}
return nil
}
func newPvcFromSnapshot(snapshot *snapshotv1.VolumeSnapshot, dataVolume *cdiv1.DataVolume) *corev1.PersistentVolumeClaim {
labels := map[string]string{
"cdi-controller": snapshot.Name,
common.CDILabelKey: common.CDILabelValue,
common.CDIComponentLabel: common.SmartClonerCDILabel,
}
ownerRef := metav1.GetControllerOf(snapshot)
if ownerRef == nil {
return nil
}
annotations := make(map[string]string)
annotations[AnnSmartCloneRequest] = "true"
annotations[AnnCloneOf] = "true"
annotations[AnnRunningCondition] = string(corev1.ConditionFalse)
annotations[AnnRunningConditionMessage] = cloneComplete
annotations[AnnRunningConditionReason] = "Completed"
return &corev1.PersistentVolumeClaim{
ObjectMeta: metav1.ObjectMeta{
Name: snapshot.Name,
Namespace: snapshot.Namespace,
Labels: labels,
Annotations: annotations,
OwnerReferences: []metav1.OwnerReference{*ownerRef},
},
Spec: corev1.PersistentVolumeClaimSpec{
DataSource: &corev1.TypedLocalObjectReference{
Name: snapshot.Name,
Kind: "VolumeSnapshot",
APIGroup: &snapshotv1.SchemeGroupVersion.Group,
},
VolumeMode: dataVolume.Spec.PVC.VolumeMode,
AccessModes: dataVolume.Spec.PVC.AccessModes,
StorageClassName: dataVolume.Spec.PVC.StorageClassName,
Resources: corev1.ResourceRequirements{
Requests: dataVolume.Spec.PVC.Resources.Requests,
},
},
}
}