containerized-data-importer/pkg/controller/dataimportcron-controller.go

/*
Copyright 2021 The CDI Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
limitations under the License.
See the License for the specific language governing permissions and
*/

package controller

import (
	"context"
	"fmt"
	"net/url"
	"reflect"
	"sort"
	"strings"
	"time"

	"github.com/containers/image/v5/docker/reference"
	"github.com/go-logr/logr"
	"github.com/gorhill/cronexpr"
	imagev1 "github.com/openshift/api/image/v1"
	"github.com/pkg/errors"
	"github.com/prometheus/client_golang/prometheus"

	batchv1 "k8s.io/api/batch/v1"
	v1beta1 "k8s.io/api/batch/v1beta1"
	corev1 "k8s.io/api/core/v1"
	extv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
	k8serrors "k8s.io/apimachinery/pkg/api/errors"
	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-api/pkg/apis/core/v1beta1"
	"kubevirt.io/containerized-data-importer/pkg/common"
	"kubevirt.io/containerized-data-importer/pkg/util"
)

const (
	prometheusNsLabel       = "ns"
	prometheusCronNameLabel = "cron_name"
)

var (
	// DataImportCronOutdatedGauge is the metric we use to alert about DataImportCrons failing
	DataImportCronOutdatedGauge = prometheus.NewGaugeVec(
		prometheus.GaugeOpts{
			Name: "kubevirt_cdi_dataimportcron_outdated",
			Help: "DataImportCron has an outdated import",
		},
		[]string{prometheusNsLabel, prometheusCronNameLabel},
	)
)

// DataImportCronReconciler members
type DataImportCronReconciler struct {
	client          client.Client
	uncachedClient  client.Client
	recorder        record.EventRecorder
	scheme          *runtime.Scheme
	log             logr.Logger
	image           string
	pullPolicy      string
	cdiNamespace    string
	installerLabels map[string]string
}

const (
	// AnnSourceDesiredDigest is the digest of the pending updated image
	AnnSourceDesiredDigest = AnnAPIGroup + "/storage.import.sourceDesiredDigest"
	// AnnImageStreamDockerRef is the ImageStream Docker reference
	AnnImageStreamDockerRef = AnnAPIGroup + "/storage.import.imageStreamDockerRef"
	// AnnNextCronTime is the next time stamp which satisfies the cron expression
	AnnNextCronTime = AnnAPIGroup + "/storage.import.nextCronTime"

	// dataImportCronFinalizer ensures CronJob is deleted when DataImportCron is deleted, as there is no cross-namespace OwnerReference
	dataImportCronFinalizer = "cdi.kubevirt.io/dataImportCronFinalizer"

	dataImportControllerName    = "dataimportcron-controller"
	digestPrefix                = "sha256:"
	digestDvNameSuffixLength    = 12
	cronJobUIDSuffixLength      = 8
	defaultImportsToKeepPerCron = 3
)

// Reconcile loop for DataImportCronReconciler
func (r *DataImportCronReconciler) Reconcile(ctx context.Context, req reconcile.Request) (reconcile.Result, error) {
	dataImportCron := &cdiv1.DataImportCron{}
	if err := r.client.Get(ctx, req.NamespacedName, dataImportCron); err != nil {
		if k8serrors.IsNotFound(err) {
			return reconcile.Result{}, nil
		}
		return reconcile.Result{}, err
	}
	if dataImportCron.DeletionTimestamp != nil {
		err := r.cleanup(ctx, dataImportCron)
		return reconcile.Result{}, err
	}
	if err := r.initCron(ctx, dataImportCron); err != nil {
		return reconcile.Result{}, err
	}
	return r.update(ctx, dataImportCron)
}

func (r *DataImportCronReconciler) initCron(ctx context.Context, dataImportCron *cdiv1.DataImportCron) error {
	if !HasFinalizer(dataImportCron, dataImportCronFinalizer) {
		crd := &extv1.CustomResourceDefinition{}
		if err := r.client.Get(context.TODO(), types.NamespacedName{Name: "dataimportcrons.cdi.kubevirt.io"}, crd); err != nil {
			return err
		}
		if crd.DeletionTimestamp != nil {
			return errors.Errorf("CRD has DeletionTimestamp")
		}
		AddFinalizer(dataImportCron, dataImportCronFinalizer)
	}
	if isURLSource(dataImportCron) && !r.cronJobExists(ctx, dataImportCron) {
		cronJob, err := r.newCronJob(dataImportCron)
		if err != nil {
			return err
		}
		if err := r.client.Create(ctx, cronJob); err != nil {
			return err
		}
		if err := r.client.Create(ctx, r.newInitialJob(dataImportCron, cronJob)); err != nil {
			return err
		}
	} else if isImageStreamSource(dataImportCron) && dataImportCron.Annotations[AnnNextCronTime] == "" {
		addAnnotation(dataImportCron, AnnNextCronTime, time.Now().Format(time.RFC3339))
	}
	return nil
}

func (r *DataImportCronReconciler) getImageStream(ctx context.Context, imageStreamName, imageStreamNamespace string) (*imagev1.ImageStream, string, error) {
	if imageStreamName == "" || imageStreamNamespace == "" {
		return nil, "", errors.Errorf("Missing ImageStream name or namespace")
	}
	imageStream := &imagev1.ImageStream{}
	name, tag, err := splitImageStreamName(imageStreamName)
	if err != nil {
		return nil, "", err
	}
	imageStreamNamespacedName := types.NamespacedName{
		Namespace: imageStreamNamespace,
		Name:      name,
	}
	if err := r.client.Get(ctx, imageStreamNamespacedName, imageStream); err != nil {
		return nil, "", err
	}
	return imageStream, tag, nil
}

func getImageStreamDigest(imageStream *imagev1.ImageStream, imageStreamTag string) (string, string, error) {
	if imageStream == nil {
		return "", "", errors.Errorf("No ImageStream")
	}
	tags := imageStream.Status.Tags
	if len(tags) == 0 {
		return "", "", errors.Errorf("ImageStream %s has no tags", imageStream.Name)
	}

	tagIdx := 0
	if len(imageStreamTag) > 0 {
		tagIdx = -1
		for i, tag := range tags {
			if tag.Tag == imageStreamTag {
				tagIdx = i
				break
			}
		}
	}
	if tagIdx == -1 {
		return "", "", errors.Errorf("ImageStream %s has no tag %s", imageStream.Name, imageStreamTag)
	}

	if len(tags[tagIdx].Items) == 0 {
		return "", "", errors.Errorf("ImageStream %s tag %s has no items", imageStream.Name, imageStreamTag)
	}
	return tags[tagIdx].Items[0].Image, tags[tagIdx].Items[0].DockerImageReference, nil
}

func splitImageStreamName(imageStreamName string) (string, string, error) {
	if subs := strings.Split(imageStreamName, ":"); len(subs) == 1 {
		return imageStreamName, "", nil
	} else if len(subs) == 2 && len(subs[0]) > 0 && len(subs[1]) > 0 {
		return subs[0], subs[1], nil
	}
	return "", "", errors.Errorf("Illegal ImageStream name %s", imageStreamName)
}

func (r *DataImportCronReconciler) pollImageStreamDigest(ctx context.Context, dataImportCron *cdiv1.DataImportCron) (reconcile.Result, error) {
	if nextTimeStr := dataImportCron.Annotations[AnnNextCronTime]; nextTimeStr != "" {
		nextTime, err := time.Parse(time.RFC3339, nextTimeStr)
		if err != nil {
			return reconcile.Result{}, err
		}
		if nextTime.Before(time.Now()) {
			if err := r.updateImageStreamDesiredDigest(ctx, dataImportCron); err != nil {
				return reconcile.Result{}, err
			}
		}
	}
	return r.setNextCronTime(dataImportCron)
}

func (r *DataImportCronReconciler) setNextCronTime(dataImportCron *cdiv1.DataImportCron) (reconcile.Result, error) {
	now := time.Now()
	expr, err := cronexpr.Parse(dataImportCron.Spec.Schedule)
	if err != nil {
		return reconcile.Result{}, err
	}
	nextTime := expr.Next(now)
	diffSec := time.Duration(nextTime.Sub(now).Seconds()) + 1
	res := reconcile.Result{Requeue: true, RequeueAfter: diffSec * time.Second}
	addAnnotation(dataImportCron, AnnNextCronTime, nextTime.Format(time.RFC3339))
	r.log.Info("setNextCronTime", "nextTime", nextTime)
	return res, err
}

func isImageStreamSource(dataImportCron *cdiv1.DataImportCron) bool {
	regSource, err := getCronRegistrySource(dataImportCron)
	return err == nil && regSource.ImageStream != nil
}

func isURLSource(dataImportCron *cdiv1.DataImportCron) bool {
	regSource, err := getCronRegistrySource(dataImportCron)
	return err == nil && regSource.URL != nil
}

func getCronRegistrySource(cron *cdiv1.DataImportCron) (*cdiv1.DataVolumeSourceRegistry, error) {
	source := cron.Spec.Template.Spec.Source
	if source == nil || source.Registry == nil {
		return nil, errors.Errorf("Cron with no registry source %s", cron.Name)
	}
	return source.Registry, nil
}

func (r *DataImportCronReconciler) update(ctx context.Context, dataImportCron *cdiv1.DataImportCron) (reconcile.Result, error) {
	log := r.log.WithName("update")
	res := reconcile.Result{}

	now := metav1.Now()
	dataImportCron.Status.LastExecutionTimestamp = &now

	importSucceeded := false
	imports := dataImportCron.Status.CurrentImports
	if imports != nil {
		// Get the currently imported DataVolume
		dataVolume := &cdiv1.DataVolume{}
		if err := r.client.Get(ctx, types.NamespacedName{Namespace: dataImportCron.Namespace, Name: imports[0].DataVolumeName}, dataVolume); err != nil {
			if !k8serrors.IsNotFound(err) {
				return res, err
			}
			log.Info("DataVolume not found for some reason, so let's recreate it", "name", imports[0].DataVolumeName)
			if err := r.createImportDataVolume(ctx, dataImportCron); err != nil {
				return res, err
			}
		}
		switch dataVolume.Status.Phase {
		case cdiv1.Succeeded:
			importSucceeded = true
			if err := r.updateDataImportCronOnSuccess(ctx, dataImportCron); err != nil {
				return res, err
			}
			updateDataImportCronCondition(dataImportCron, cdiv1.DataImportCronProgressing, corev1.ConditionFalse, "No current import", noImport)
			if err := r.garbageCollectOldImports(ctx, dataImportCron); err != nil {
				return res, err
			}
		case cdiv1.ImportScheduled:
			updateDataImportCronCondition(dataImportCron, cdiv1.DataImportCronProgressing, corev1.ConditionFalse, "Import is scheduled", scheduled)
		case cdiv1.ImportInProgress:
			updateDataImportCronCondition(dataImportCron, cdiv1.DataImportCronProgressing, corev1.ConditionTrue, "Import is progressing", inProgress)
		default:
			dvPhase := string(dataVolume.Status.Phase)
			updateDataImportCronCondition(dataImportCron, cdiv1.DataImportCronProgressing, corev1.ConditionFalse, fmt.Sprintf("Import DataVolume phase %s", dvPhase), dvPhase)
		}
	} else {
		updateDataImportCronCondition(dataImportCron, cdiv1.DataImportCronProgressing, corev1.ConditionFalse, "No current import", noImport)
	}

	if err := r.updateDataSource(ctx, dataImportCron); err != nil {
		return res, err
	}

	// We use the poller returned reconcile.Result for RequeueAfter if needed
	var err error
	if isImageStreamSource(dataImportCron) {
		res, err = r.pollImageStreamDigest(ctx, dataImportCron)
		if err != nil {
			return res, err
		}
	}

	desiredDigest := dataImportCron.Annotations[AnnSourceDesiredDigest]
	digestUpdated := desiredDigest != "" && (len(imports) == 0 || desiredDigest != imports[0].Digest)
	if digestUpdated {
		updateDataImportCronCondition(dataImportCron, cdiv1.DataImportCronUpToDate, corev1.ConditionFalse, "Source digest updated since last import", outdated)
		if importSucceeded || len(imports) == 0 {
			if err := r.createImportDataVolume(ctx, dataImportCron); err != nil {
				return res, err
			}
		}
	} else if importSucceeded {
		updateDataImportCronCondition(dataImportCron, cdiv1.DataImportCronUpToDate, corev1.ConditionTrue, "Latest import is up to date", upToDate)
	} else if len(imports) > 0 {
		updateDataImportCronCondition(dataImportCron, cdiv1.DataImportCronUpToDate, corev1.ConditionFalse, "Import is progressing", inProgress)
	} else {
		updateDataImportCronCondition(dataImportCron, cdiv1.DataImportCronUpToDate, corev1.ConditionFalse, "No source digest", noDigest)
	}

	if err := r.client.Update(ctx, dataImportCron); err != nil {
		return res, err
	}
	return res, nil
}

func (r *DataImportCronReconciler) updateImageStreamDesiredDigest(ctx context.Context, dataImportCron *cdiv1.DataImportCron) error {
	regSource, err := getCronRegistrySource(dataImportCron)
	if err != nil {
		return err
	}
	if regSource.ImageStream == nil {
		return nil
	}
	imageStream, imageStreamTag, err := r.getImageStream(ctx, *regSource.ImageStream, dataImportCron.Namespace)
	if err != nil {
		return err
	}
	digest, dockerRef, err := getImageStreamDigest(imageStream, imageStreamTag)
	if err != nil {
		return err
	}
	if digest != "" && dataImportCron.Annotations[AnnSourceDesiredDigest] != digest {
		r.log.Info("Updated", "digest", digest, "cron", dataImportCron.Name)
		addAnnotation(dataImportCron, AnnSourceDesiredDigest, digest)
		addAnnotation(dataImportCron, AnnImageStreamDockerRef, dockerRef)
	}
	return nil
}

func (r *DataImportCronReconciler) updateDataSource(ctx context.Context, dataImportCron *cdiv1.DataImportCron) error {
	log := r.log.WithName("updateDataSource")
	dataSourceName := dataImportCron.Spec.ManagedDataSource
	dataSource := &cdiv1.DataSource{}
	if err := r.client.Get(ctx, types.NamespacedName{Namespace: dataImportCron.Namespace, Name: dataSourceName}, dataSource); err != nil {
		if k8serrors.IsNotFound(err) {
			log.Info("Create DataSource", "name", dataSourceName)
			dataSource = newDataSource(dataImportCron)
			if err := r.client.Create(ctx, dataSource); err != nil {
				return err
			}
		} else {
			return err
		}
	}
	dataSourceCopy := dataSource.DeepCopy()
	util.SetRecommendedLabels(dataSource, r.installerLabels, common.CDIControllerName)
	dataSource.Labels[common.DataImportCronLabel] = dataImportCron.Name

	sourcePVC := dataImportCron.Status.LastImportedPVC
	if sourcePVC != nil {
		dataSource.Spec.Source.PVC = sourcePVC
	}
	if !reflect.DeepEqual(dataSource, dataSourceCopy) {
		if err := r.client.Update(ctx, dataSource); err != nil {
			return err
		}
	}
	return nil
}

func (r *DataImportCronReconciler) updateDataImportCronOnSuccess(ctx context.Context, dataImportCron *cdiv1.DataImportCron) error {
	if dataImportCron.Status.CurrentImports == nil {
		return errors.Errorf("No CurrentImports in cron %s", dataImportCron.Name)
	}
	sourcePVC := &cdiv1.DataVolumeSourcePVC{
		Namespace: dataImportCron.Namespace,
		Name:      dataImportCron.Status.CurrentImports[0].DataVolumeName,
	}
	if dataImportCron.Status.LastImportedPVC == nil || *dataImportCron.Status.LastImportedPVC != *sourcePVC {
		dataImportCron.Status.LastImportedPVC = sourcePVC
		now := metav1.Now()
		dataImportCron.Status.LastImportTimestamp = &now
	}
	return nil
}

func (r *DataImportCronReconciler) createImportDataVolume(ctx context.Context, dataImportCron *cdiv1.DataImportCron) error {
	dataSourceName := dataImportCron.Spec.ManagedDataSource
	digest := dataImportCron.Annotations[AnnSourceDesiredDigest]
	dvName := createDvName(dataSourceName, digest)
	dv := r.newSourceDataVolume(dataImportCron, dvName)
	if err := r.client.Create(ctx, dv); err != nil {
		if !k8serrors.IsAlreadyExists(err) {
			return err
		}
		if err := r.client.Get(ctx, types.NamespacedName{Namespace: dv.Namespace, Name: dv.Name}, dv); err != nil {
			return err
		}
		// Touch the DV Ready condition heartbeat time, so DV wan't be garbage collected
		if cond := findConditionByType(cdiv1.DataVolumeReady, dv.Status.Conditions); cond != nil {
			cond.LastHeartbeatTime = metav1.Now()
			if err := r.client.Update(ctx, dv); err != nil {
				return err
			}
		}
	}
	// Update references to current import
	dataImportCron.Status.CurrentImports = []cdiv1.ImportStatus{{DataVolumeName: dvName, Digest: digest}}
	return nil
}

func (r *DataImportCronReconciler) garbageCollectOldImports(ctx context.Context, dataImportCron *cdiv1.DataImportCron) error {
	if dataImportCron.Spec.GarbageCollect != nil && *dataImportCron.Spec.GarbageCollect != cdiv1.DataImportCronGarbageCollectOutdated {
		return nil
	}
	maxDvs := defaultImportsToKeepPerCron
	importsToKeep := dataImportCron.Spec.ImportsToKeep
	if importsToKeep != nil && *importsToKeep >= 0 {
		maxDvs = int(*importsToKeep)
	}
	return r.deleteOldImports(ctx, dataImportCron, maxDvs)
}

func (r *DataImportCronReconciler) deleteOldImports(ctx context.Context, dataImportCron *cdiv1.DataImportCron, maxDvs int) error {
	log := r.log.WithName("deleteOldImports")
	selector, err := metav1.LabelSelectorAsSelector(&metav1.LabelSelector{
		MatchLabels: map[string]string{
			common.DataImportCronLabel: dataImportCron.Name,
		},
	})
	if err != nil {
		return err
	}
	dvList := &cdiv1.DataVolumeList{}
	if err := r.client.List(ctx, dvList, &client.ListOptions{Namespace: dataImportCron.Namespace, LabelSelector: selector}); err != nil {
		return err
	}
	if len(dvList.Items) <= maxDvs {
		return nil
	}
	sort.Slice(dvList.Items, func(i, j int) bool {
		getDvTimestamp := func(dv cdiv1.DataVolume) time.Time {
			if cond := findConditionByType(cdiv1.DataVolumeReady, dv.Status.Conditions); cond != nil {
				return cond.LastHeartbeatTime.Time
			}
			return dv.CreationTimestamp.Time
		}
		return getDvTimestamp(dvList.Items[i]).After(getDvTimestamp(dvList.Items[j]))
	})
	for _, dv := range dvList.Items[maxDvs:] {
		if err := r.client.Delete(ctx, &dv); err != nil {
			if k8serrors.IsNotFound(err) {
				log.Info("DataVolume not found for deletion", "name", dv.Name)
			} else {
				log.Error(err, "Unable to delete DataVolume", "name", dv.Name)
			}
		} else {
			log.Info("DataVolume deleted", "name", dv.Name)
		}
	}
	return nil
}

func (r *DataImportCronReconciler) cleanup(ctx context.Context, dataImportCron *cdiv1.DataImportCron) error {
	if !HasFinalizer(dataImportCron, dataImportCronFinalizer) {
		return nil
	}

	// Don't keep alerting over a cron thats being deleted, will get set back to 1 again by reconcile loop if needed.
	DataImportCronOutdatedGauge.With(getPrometheusCronLabels(dataImportCron)).Set(0)

	if err := r.deleteJobs(ctx, dataImportCron); err != nil {
		return err
	}

	if dataImportCron.Spec.RetentionPolicy != nil && *dataImportCron.Spec.RetentionPolicy == cdiv1.DataImportCronRetainNone {
		dataSource := &cdiv1.DataSource{ObjectMeta: metav1.ObjectMeta{Namespace: dataImportCron.Namespace, Name: dataImportCron.Spec.ManagedDataSource}}
		if err := r.client.Delete(ctx, dataSource); IgnoreNotFound(err) != nil {
			return err
		}
		if err := r.deleteOldImports(ctx, dataImportCron, 0); err != nil {
			return err
		}
	}

	RemoveFinalizer(dataImportCron, dataImportCronFinalizer)
	if err := r.client.Update(ctx, dataImportCron); err != nil {
		return err
	}
	return nil
}

func (r *DataImportCronReconciler) deleteJobs(ctx context.Context, dataImportCron *cdiv1.DataImportCron) error {
	deletePropagationBackground := metav1.DeletePropagationBackground
	deleteOpts := &client.DeleteOptions{PropagationPolicy: &deletePropagationBackground}
	cronJob := &v1beta1.CronJob{ObjectMeta: metav1.ObjectMeta{Namespace: r.cdiNamespace, Name: GetCronJobName(dataImportCron)}}
	if err := r.client.Delete(ctx, cronJob, deleteOpts); IgnoreNotFound(err) != nil {
		return err
	}
	job := &batchv1.Job{ObjectMeta: metav1.ObjectMeta{Namespace: r.cdiNamespace, Name: GetInitialJobName(dataImportCron)}}
	if err := r.client.Delete(ctx, job, deleteOpts); IgnoreNotFound(err) != nil {
		return err
	}
	return nil
}

// NewDataImportCronController creates a new instance of the DataImportCron controller
func NewDataImportCronController(mgr manager.Manager, log logr.Logger, importerImage, pullPolicy string, installerLabels map[string]string) (controller.Controller, error) {
	uncachedClient, err := client.New(mgr.GetConfig(), client.Options{
		Scheme: mgr.GetScheme(),
		Mapper: mgr.GetRESTMapper(),
	})
	if err != nil {
		return nil, err
	}
	reconciler := &DataImportCronReconciler{
		client:          mgr.GetClient(),
		uncachedClient:  uncachedClient,
		recorder:        mgr.GetEventRecorderFor(dataImportControllerName),
		scheme:          mgr.GetScheme(),
		log:             log.WithName(dataImportControllerName),
		image:           importerImage,
		pullPolicy:      pullPolicy,
		cdiNamespace:    util.GetNamespace(),
		installerLabels: installerLabels,
	}
	dataImportCronController, err := controller.New(dataImportControllerName, mgr, controller.Options{Reconciler: reconciler})
	if err != nil {
		return nil, err
	}
	if err := addDataImportCronControllerWatches(mgr, dataImportCronController, log); err != nil {
		return nil, err
	}
	log.Info("Initialized DataImportCron controller")
	return dataImportCronController, nil
}

func addDataImportCronControllerWatches(mgr manager.Manager, c controller.Controller, log logr.Logger) error {
	if err := cdiv1.AddToScheme(mgr.GetScheme()); err != nil {
		return err
	}
	if err := imagev1.AddToScheme(mgr.GetScheme()); err != nil {
		return err
	}
	if err := extv1.AddToScheme(mgr.GetScheme()); err != nil {
		return err
	}
	if err := c.Watch(&source.Kind{Type: &cdiv1.DataImportCron{}}, &handler.EnqueueRequestForObject{}); err != nil {
		return err
	}

	getCronName := func(obj client.Object) string {
		return obj.GetLabels()[common.DataImportCronLabel]
	}
	mapToCron := func(obj client.Object) []reconcile.Request {
		return []reconcile.Request{{NamespacedName: types.NamespacedName{Name: getCronName(obj), Namespace: obj.GetNamespace()}}}
	}
	if err := c.Watch(&source.Kind{Type: &cdiv1.DataVolume{}},
		handler.EnqueueRequestsFromMapFunc(mapToCron),
		predicate.Funcs{
			CreateFunc: func(e event.CreateEvent) bool { return false },
			UpdateFunc: func(e event.UpdateEvent) bool { return getCronName(e.ObjectNew) != "" },
			DeleteFunc: func(e event.DeleteEvent) bool { return getCronName(e.Object) != "" },
		},
	); err != nil {
		return err
	}
	// Watch only for DataSource deletion
	if err := c.Watch(&source.Kind{Type: &cdiv1.DataSource{}},
		handler.EnqueueRequestsFromMapFunc(mapToCron),
		predicate.Funcs{
			CreateFunc: func(event.CreateEvent) bool { return false },
			UpdateFunc: func(event.UpdateEvent) bool { return false },
			DeleteFunc: func(e event.DeleteEvent) bool { return getCronName(e.Object) != "" },
		},
	); err != nil {
		return err
	}
	return nil
}

func (r *DataImportCronReconciler) cronJobExists(ctx context.Context, cron *cdiv1.DataImportCron) bool {
	var cronJob v1beta1.CronJob
	cronJobNamespacedName := types.NamespacedName{Namespace: r.cdiNamespace, Name: GetCronJobName(cron)}
	return r.uncachedClient.Get(ctx, cronJobNamespacedName, &cronJob) == nil
}

func (r *DataImportCronReconciler) newCronJob(cron *cdiv1.DataImportCron) (*v1beta1.CronJob, error) {
	regSource, err := getCronRegistrySource(cron)
	if err != nil {
		return nil, err
	}
	if regSource.URL == nil {
		return nil, errors.Errorf("No URL source in cron %s", cron.Name)
	}
	cdiConfig := &cdiv1.CDIConfig{}
	if err = r.client.Get(context.TODO(), types.NamespacedName{Name: common.ConfigName}, cdiConfig); err != nil {
		return nil, err
	}
	insecureTLS, err := IsInsecureTLS(*regSource.URL, cdiConfig, r.uncachedClient, r.log)
	if err != nil {
		return nil, err
	}
	container := corev1.Container{
		Name:  "cdi-source-update-poller",
		Image: r.image,
		Command: []string{
			"/usr/bin/cdi-source-update-poller",
			"-ns", cron.Namespace,
			"-cron", cron.Name,
			"-url", *regSource.URL,
		},
		ImagePullPolicy: corev1.PullPolicy(r.pullPolicy),
	}

	hasCertConfigMap := regSource.CertConfigMap != nil && *regSource.CertConfigMap != ""
	if hasCertConfigMap {
		vm := corev1.VolumeMount{
			Name:      CertVolName,
			MountPath: common.ImporterCertDir,
		}
		container.VolumeMounts = []corev1.VolumeMount{vm}
		container.Command = append(container.Command, "-certdir", common.ImporterCertDir)
	}

	if regSource.SecretRef != nil && *regSource.SecretRef != "" {
		container.Env = append(container.Env,
			corev1.EnvVar{
				Name: common.ImporterAccessKeyID,
				ValueFrom: &corev1.EnvVarSource{
					SecretKeyRef: &corev1.SecretKeySelector{
						LocalObjectReference: corev1.LocalObjectReference{
							Name: *regSource.SecretRef,
						},
						Key: common.KeyAccess,
					},
				},
			},
			corev1.EnvVar{
				Name: common.ImporterSecretKey,
				ValueFrom: &corev1.EnvVarSource{
					SecretKeyRef: &corev1.SecretKeySelector{
						LocalObjectReference: corev1.LocalObjectReference{
							Name: *regSource.SecretRef,
						},
						Key: common.KeySecret,
					},
				},
			},
		)
	}

	if insecureTLS {
		container.Env = append(container.Env,
			corev1.EnvVar{
				Name:  common.InsecureTLSVar,
				Value: "true",
			},
		)
	}

	successfulJobsHistoryLimit := int32(0)
	failedJobsHistoryLimit := int32(0)
	ttlSecondsAfterFinished := int32(0)
	backoffLimit := int32(2)
	gracePeriodSeconds := int64(0)

	cronJobName := GetCronJobName(cron)
	cronJob := &v1beta1.CronJob{
		ObjectMeta: metav1.ObjectMeta{
			Name:      cronJobName,
			Namespace: r.cdiNamespace,
		},
		Spec: v1beta1.CronJobSpec{
			Schedule:                   cron.Spec.Schedule,
			ConcurrencyPolicy:          v1beta1.ForbidConcurrent,
			SuccessfulJobsHistoryLimit: &successfulJobsHistoryLimit,
			FailedJobsHistoryLimit:     &failedJobsHistoryLimit,
			JobTemplate: v1beta1.JobTemplateSpec{
				Spec: batchv1.JobSpec{
					Template: corev1.PodTemplateSpec{
						Spec: corev1.PodSpec{
							RestartPolicy:                 corev1.RestartPolicyNever,
							TerminationGracePeriodSeconds: &gracePeriodSeconds,
							Containers:                    []corev1.Container{container},
							ServiceAccountName:            "cdi-cronjob",
						},
					},
					TTLSecondsAfterFinished: &ttlSecondsAfterFinished,
					BackoffLimit:            &backoffLimit,
				},
			},
		},
	}

	if hasCertConfigMap {
		vol := corev1.Volume{
			Name: CertVolName,
			VolumeSource: corev1.VolumeSource{
				ConfigMap: &corev1.ConfigMapVolumeSource{
					LocalObjectReference: corev1.LocalObjectReference{
						Name: *regSource.CertConfigMap,
					},
				},
			},
		}
		cronJob.Spec.JobTemplate.Spec.Template.Spec.Volumes = []corev1.Volume{vol}
	}

	util.SetRecommendedLabels(cronJob, r.installerLabels, common.CDIControllerName)
	return cronJob, nil
}

func (r *DataImportCronReconciler) newInitialJob(cron *cdiv1.DataImportCron, cronJob *v1beta1.CronJob) *batchv1.Job {
	job := &batchv1.Job{
		ObjectMeta: metav1.ObjectMeta{
			Name:      GetInitialJobName(cron),
			Namespace: cronJob.Namespace,
		},
		Spec: cronJob.Spec.JobTemplate.Spec,
	}
	util.SetRecommendedLabels(job, r.installerLabels, common.CDIControllerName)
	return job
}

func (r *DataImportCronReconciler) newSourceDataVolume(cron *cdiv1.DataImportCron, dataVolumeName string) *cdiv1.DataVolume {
	var digestedURL string
	dv := cron.Spec.Template.DeepCopy()
	if isURLSource(cron) {
		digestedURL = untagDigestedDockerURL(*dv.Spec.Source.Registry.URL + "@" + cron.Annotations[AnnSourceDesiredDigest])
	} else if isImageStreamSource(cron) {
		// No way to import image stream by name when we want speciific digest, so we use its docker reference
		digestedURL = "docker://" + cron.Annotations[AnnImageStreamDockerRef]
		dv.Spec.Source.Registry.ImageStream = nil
	}
	dv.Spec.Source.Registry.URL = &digestedURL
	dv.Name = dataVolumeName
	dv.Namespace = cron.Namespace
	util.SetRecommendedLabels(dv, r.installerLabels, common.CDIControllerName)
	dv.Labels[common.DataImportCronLabel] = cron.Name
	passCronAnnotationToDv(cron, dv, AnnImmediateBinding)
	passCronAnnotationToDv(cron, dv, AnnPodRetainAfterCompletion)
	return dv
}

func untagDigestedDockerURL(dockerURL string) string {
	if u, err := url.Parse(dockerURL); err == nil {
		url := u.Host + u.Path
		subs := reference.ReferenceRegexp.FindStringSubmatch(url)
		// Check for tag
		if len(subs) > 2 && len(subs[2]) > 0 {
			if untaggedRef, err := reference.ParseDockerRef(url); err == nil {
				return u.Scheme + "://" + untaggedRef.String()
			}
		}
	}
	return dockerURL
}

func passCronAnnotationToDv(cron *cdiv1.DataImportCron, dv *cdiv1.DataVolume, ann string) {
	if val := cron.Annotations[ann]; val != "" {
		addAnnotation(dv, ann, val)
	}
}

func newDataSource(cron *cdiv1.DataImportCron) *cdiv1.DataSource {
	dataSource := &cdiv1.DataSource{
		ObjectMeta: metav1.ObjectMeta{
			Name:      cron.Spec.ManagedDataSource,
			Namespace: cron.Namespace,
		},
	}
	return dataSource
}

// Create DataVolume name based on the DataSource name + prefix of the digest sha256
func createDvName(prefix, digest string) string {
	fromIdx := len(digestPrefix)
	toIdx := fromIdx + digestDvNameSuffixLength
	return prefix + "-" + digest[fromIdx:toIdx]
}

// GetCronJobName get CronJob name based on cron name and UID
func GetCronJobName(cron *cdiv1.DataImportCron) string {
	return cron.Name + "-" + string(cron.UID)[:cronJobUIDSuffixLength]
}

// GetInitialJobName get initial job name based on cron name and UID
func GetInitialJobName(cron *cdiv1.DataImportCron) string {
	return "initial-job-" + GetCronJobName(cron)
}