handle resource snapshot missing but work already synced and add cro/…

…ro annotation

apis/placement/v1beta1/commons.go

@@ -50,6 +50,12 @@ const (
 	// The format is {workPrefix}-configMap-uuid
 	WorkNameWithConfigEnvelopeFmt = "%s-configmap-%s"
 
+	// ParentClusterResourceOverrideSnapshotHashAnnotation is the label to work that contains the hash of the parent cluster resource override snapshot list.
+	ParentClusterResourceOverrideSnapshotHashAnnotation = fleetPrefix + "parent-cluster-resource-override-snapshot-hash"
+
+	// ParentResourceOverrideSnapshotHashAnnotation is the label to work that contains the hash of the parent resource override snapshot list.
+	ParentResourceOverrideSnapshotHashAnnotation = fleetPrefix + "parent-resource-override-snapshot-hash"
+
 	// ParentResourceSnapshotIndexLabel is the label applied to work that contains the index of the resource snapshot that generates the work.
 	ParentResourceSnapshotIndexLabel = fleetPrefix + "parent-resource-snapshot-index"
 

pkg/controllers/rollout/controller.go

@@ -281,6 +281,7 @@ func createUpdateInfo(binding *fleetv1beta1.ClusterResourceBinding, crp *fleetv1
 	desiredBinding.Spec.ResourceSnapshotName = latestResourceSnapshot.Name
 	// update the resource apply strategy when controller rolls out the new changes
 	desiredBinding.Spec.ApplyStrategy = crp.Spec.Strategy.ApplyStrategy
+	// TODO: check the size of the cro and ro to not exceed the limit
 	desiredBinding.Spec.ClusterResourceOverrideSnapshots = cro
 	desiredBinding.Spec.ResourceOverrideSnapshots = ro
 	return toBeUpdatedBinding{

pkg/controllers/workgenerator/controller.go

@@ -49,13 +49,14 @@ import (
 	"go.goms.io/fleet/pkg/utils/controller"
 	"go.goms.io/fleet/pkg/utils/informer"
 	"go.goms.io/fleet/pkg/utils/labels"
+	"go.goms.io/fleet/pkg/utils/resource"
 )
 
 var (
 	// maxFailedResourcePlacementLimit indicates the max number of failed resource placements to include in the status.
 	maxFailedResourcePlacementLimit = 100
 
-	errResourceSnapshotNotFound = errors.New("the master resource snapshot is not found")
+	errResourceSnapshotNotFound = fmt.Errorf("the master resource snapshot is not found")
 )
 
 // Reconciler watches binding objects and generate work objects in the designated cluster namespace
@@ -375,10 +376,28 @@ func (r *Reconciler) listAllWorksAssociated(ctx context.Context, resourceBinding
 func (r *Reconciler) syncAllWork(ctx context.Context, resourceBinding *fleetv1beta1.ClusterResourceBinding, existingWorks map[string]*fleetv1beta1.Work, cluster clusterv1beta1.MemberCluster) (bool, bool, error) {
 	updateAny := atomic.NewBool(false)
 	resourceBindingRef := klog.KObj(resourceBinding)
+	// the hash256 function can can handle empty list https://go.dev/play/p/_4HW17fooXM
+	resourceOverrideSnapshotHash, err := resource.HashOf(resourceBinding.Spec.ResourceOverrideSnapshots)
+	if err != nil {
+		return false, false, controller.NewUnexpectedBehaviorError(err)
+	}
+	clusterResourceOverrideSnapshotHash, err := resource.HashOf(resourceBinding.Spec.ClusterResourceOverrideSnapshots)
+	if err != nil {
+		return false, false, controller.NewUnexpectedBehaviorError(err)
+	}
+	// TODO: check all work synced first before fetching the snapshots after we put ParentResourceOverrideSnapshotHashAnnotation and ParentClusterResourceOverrideSnapshotHashAnnotation in all the work objects
 
 	// Gather all the resource resourceSnapshots
 	resourceSnapshots, err := r.fetchAllResourceSnapshots(ctx, resourceBinding)
 	if err != nil {
+		if errors.Is(err, errResourceSnapshotNotFound) {
+			// the resourceIndex is deleted but the works might still be up to date with the binding.
+			if areAllWorkSynced(existingWorks, resourceBinding.Spec.ResourceSnapshotName, resourceOverrideSnapshotHash, clusterResourceOverrideSnapshotHash) {
+				klog.V(2).InfoS("All the works are synced with the resourceBinding even if the resource snapshot index is removed", "resourceBinding", resourceBindingRef)
+				return false, false, nil
+			}
+			return false, false, controller.NewUserError(err)
+		}
 		// TODO(RZ): handle errResourceNotFullyCreated error so we don't need to wait for all the snapshots to be created
 		return false, false, err
 	}
@@ -422,7 +441,7 @@ func (r *Reconciler) syncAllWork(ctx context.Context, resourceBinding *fleetv1be
 			if uResource.GetObjectKind().GroupVersionKind() == utils.ConfigMapGVK &&
 				len(uResource.GetAnnotations()[fleetv1beta1.EnvelopeConfigMapAnnotation]) != 0 {
 				// get a work object for the enveloped configMap
-				work, err := r.getConfigMapEnvelopWorkObj(ctx, workNamePrefix, resourceBinding, snapshot, &uResource)
+				work, err := r.getConfigMapEnvelopWorkObj(ctx, workNamePrefix, resourceBinding, snapshot, &uResource, resourceOverrideSnapshotHash, clusterResourceOverrideSnapshotHash)
 				if err != nil {
 					return true, false, err
 				}
@@ -438,7 +457,7 @@ func (r *Reconciler) syncAllWork(ctx context.Context, resourceBinding *fleetv1be
 		// generate a work object for the manifests even if there is nothing to place
 		// to allow CRP to collect the status of the placement
 		// TODO (RZ): revisit to see if we need this hack
-		work := generateSnapshotWorkObj(workNamePrefix, resourceBinding, snapshot, simpleManifests)
+		work := generateSnapshotWorkObj(workNamePrefix, resourceBinding, snapshot, simpleManifests, resourceOverrideSnapshotHash, clusterResourceOverrideSnapshotHash)
 		activeWork[work.Name] = work
 		newWork = append(newWork, work)
 
@@ -485,6 +504,17 @@ func (r *Reconciler) syncAllWork(ctx context.Context, resourceBinding *fleetv1be
 	return true, updateAny.Load(), nil
 }
 
+// areAllWorkSynced checks if all the works are synced with the resource binding.
+func areAllWorkSynced(existingWorks map[string]*fleetv1beta1.Work, resourceSnapshotIndex, _, _ string) bool {
+	// TODO: check resourceOverrideSnapshotHash and  clusterResourceOverrideSnapshotHash after all the work has the ParentResourceOverrideSnapshotHashAnnotation and ParentClusterResourceOverrideSnapshotHashAnnotation
+	for _, work := range existingWorks {
+		if work.GetLabels()[fleetv1beta1.ParentResourceSnapshotIndexLabel] != resourceSnapshotIndex {
+			return false
+		}
+	}
+	return true
+}
+
 // fetchAllResourceSnapshots gathers all the resource snapshots for the resource binding.
 func (r *Reconciler) fetchAllResourceSnapshots(ctx context.Context, resourceBinding *fleetv1beta1.ClusterResourceBinding) (map[string]*fleetv1beta1.ClusterResourceSnapshot, error) {
 	// fetch the master snapshot first
@@ -504,7 +534,7 @@ func (r *Reconciler) fetchAllResourceSnapshots(ctx context.Context, resourceBind
 // getConfigMapEnvelopWorkObj first try to locate a work object for the corresponding envelopObj of type configMap.
 // we create a new one if the work object doesn't exist. We do this to avoid repeatedly delete and create the same work object.
 func (r *Reconciler) getConfigMapEnvelopWorkObj(ctx context.Context, workNamePrefix string, resourceBinding *fleetv1beta1.ClusterResourceBinding,
-	resourceSnapshot *fleetv1beta1.ClusterResourceSnapshot, envelopeObj *unstructured.Unstructured) (*fleetv1beta1.Work, error) {
+	resourceSnapshot *fleetv1beta1.ClusterResourceSnapshot, envelopeObj *unstructured.Unstructured, resourceOverrideSnapshotHash, clusterResourceOverrideSnapshotHash string) (*fleetv1beta1.Work, error) {
 	// we group all the resources in one configMap to one work
 	manifest, err := extractResFromConfigMap(envelopeObj)
 	if err != nil {
@@ -514,6 +544,7 @@ func (r *Reconciler) getConfigMapEnvelopWorkObj(ctx context.Context, workNamePre
 	}
 	klog.V(2).InfoS("Successfully extract the enveloped resources from the configMap", "numOfResources", len(manifest),
 		"snapshot", klog.KObj(resourceSnapshot), "resourceBinding", klog.KObj(resourceBinding), "configMapWrapper", klog.KObj(envelopeObj))
+
 	// Try to see if we already have a work represent the same enveloped object for this CRP in the same cluster
 	// The ParentResourceSnapshotIndexLabel can change between snapshots so we have to exclude that label in the match
 	envelopWorkLabelMatcher := client.MatchingLabels{
@@ -544,6 +575,10 @@ func (r *Reconciler) getConfigMapEnvelopWorkObj(ctx context.Context, workNamePre
 					fleetv1beta1.EnvelopeNameLabel:                envelopeObj.GetName(),
 					fleetv1beta1.EnvelopeNamespaceLabel:           envelopeObj.GetNamespace(),
 				},
+				Annotations: map[string]string{
+					fleetv1beta1.ParentResourceOverrideSnapshotHashAnnotation:        resourceOverrideSnapshotHash,
+					fleetv1beta1.ParentClusterResourceOverrideSnapshotHashAnnotation: clusterResourceOverrideSnapshotHash,
+				},
 				OwnerReferences: []metav1.OwnerReference{
 					{
 						APIVersion:         fleetv1beta1.GroupVersion.String(),
@@ -567,16 +602,18 @@ func (r *Reconciler) getConfigMapEnvelopWorkObj(ctx context.Context, workNamePre
 		klog.ErrorS(controller.NewUnexpectedBehaviorError(fmt.Errorf("find %d work representing configMap", len(workList.Items))),
 			"snapshot", klog.KObj(resourceSnapshot), "resourceBinding", klog.KObj(resourceBinding), "configMapWrapper", klog.KObj(envelopeObj))
 	}
-	// we just pick the first one if there are more than one.
 	work := workList.Items[0]
 	work.Labels[fleetv1beta1.ParentResourceSnapshotIndexLabel] = resourceSnapshot.Labels[fleetv1beta1.ResourceIndexLabel]
+	work.Annotations[fleetv1beta1.ParentResourceOverrideSnapshotHashAnnotation] = resourceOverrideSnapshotHash
+	work.Annotations[fleetv1beta1.ParentClusterResourceOverrideSnapshotHashAnnotation] = clusterResourceOverrideSnapshotHash
 	work.Spec.Workload.Manifests = manifest
 	work.Spec.ApplyStrategy = resourceBinding.Spec.ApplyStrategy
 	return &work, nil
 }
 
 // generateSnapshotWorkObj generates the work object for the corresponding snapshot
-func generateSnapshotWorkObj(workName string, resourceBinding *fleetv1beta1.ClusterResourceBinding, resourceSnapshot *fleetv1beta1.ClusterResourceSnapshot, manifest []fleetv1beta1.Manifest) *fleetv1beta1.Work {
+func generateSnapshotWorkObj(workName string, resourceBinding *fleetv1beta1.ClusterResourceBinding, resourceSnapshot *fleetv1beta1.ClusterResourceSnapshot,
+	manifest []fleetv1beta1.Manifest, resourceOverrideSnapshotHash, clusterResourceOverrideSnapshotHash string) *fleetv1beta1.Work {
 	return &fleetv1beta1.Work{
 		ObjectMeta: metav1.ObjectMeta{
 			Name:      workName,
@@ -586,6 +623,10 @@ func generateSnapshotWorkObj(workName string, resourceBinding *fleetv1beta1.Clus
 				fleetv1beta1.CRPTrackingLabel:                 resourceBinding.Labels[fleetv1beta1.CRPTrackingLabel],
 				fleetv1beta1.ParentResourceSnapshotIndexLabel: resourceSnapshot.Labels[fleetv1beta1.ResourceIndexLabel],
 			},
+			Annotations: map[string]string{
+				fleetv1beta1.ParentResourceOverrideSnapshotHashAnnotation:        resourceOverrideSnapshotHash,
+				fleetv1beta1.ParentClusterResourceOverrideSnapshotHashAnnotation: clusterResourceOverrideSnapshotHash,
+			},
 			OwnerReferences: []metav1.OwnerReference{
 				{
 					APIVersion:         fleetv1beta1.GroupVersion.String(),
@@ -619,6 +660,7 @@ func (r *Reconciler) upsertWork(ctx context.Context, newWork, existingWork *flee
 			"resourceSnapshot", resourceSnapshotObj, "work", workObj)
 		return true, nil
 	}
+	// TODO: remove the compare after we did the check on all work in the sync all
 	// check if we need to update the existing work object
 	workResourceIndex, err := labels.ExtractResourceSnapshotIndexFromWork(existingWork)
 	if err != nil {
@@ -628,12 +670,19 @@ func (r *Reconciler) upsertWork(ctx context.Context, newWork, existingWork *flee
 	// we already checked the label in fetchAllResourceSnapShots function so no need to check again
 	resourceIndex, _ := labels.ExtractResourceIndexFromClusterResourceSnapshot(resourceSnapshot)
 	if workResourceIndex == resourceIndex {
-		// no need to do anything if the work is generated from the same resource snapshot group since the resource snapshot is immutable.
-		klog.V(2).InfoS("Work is already associated with the desired resourceSnapshot", "resourceIndex", resourceIndex, "work", workObj, "resourceSnapshot", resourceSnapshotObj)
-		return false, nil
+		// no need to do anything if the work is generated from the same snapshots
+		if existingWork.Annotations[fleetv1beta1.ParentResourceOverrideSnapshotHashAnnotation] == newWork.Annotations[fleetv1beta1.ParentResourceOverrideSnapshotHashAnnotation] &&
+			existingWork.Annotations[fleetv1beta1.ParentClusterResourceOverrideSnapshotHashAnnotation] == newWork.Annotations[fleetv1beta1.ParentClusterResourceOverrideSnapshotHashAnnotation] {
+			klog.V(2).InfoS("Work is not associated with the desired override snapshots", "existingROHash", existingWork.Annotations[fleetv1beta1.ParentResourceOverrideSnapshotHashAnnotation],
+				"existingCROHash", existingWork.Annotations[fleetv1beta1.ParentClusterResourceOverrideSnapshotHashAnnotation], "work", workObj)
+			return false, nil
+		}
+		klog.V(2).InfoS("Work is already associated with the desired resourceSnapshot but still not having the right override snapshots", "resourceIndex", resourceIndex, "work", workObj, "resourceSnapshot", resourceSnapshotObj)
 	}
-	// need to update the existing work, only two possible changes:
-	existingWork.Labels[fleetv1beta1.ParentResourceSnapshotIndexLabel] = resourceSnapshot.Labels[fleetv1beta1.ResourceIndexLabel]
+	// need to copy the new work to the existing work, only 4 possible changes:
+	existingWork.Labels[fleetv1beta1.ParentResourceSnapshotIndexLabel] = newWork.Labels[fleetv1beta1.ParentResourceSnapshotIndexLabel]
+	existingWork.Annotations[fleetv1beta1.ParentResourceOverrideSnapshotHashAnnotation] = newWork.Annotations[fleetv1beta1.ParentResourceOverrideSnapshotHashAnnotation]
+	existingWork.Annotations[fleetv1beta1.ParentClusterResourceOverrideSnapshotHashAnnotation] = newWork.Annotations[fleetv1beta1.ParentClusterResourceOverrideSnapshotHashAnnotation]
 	existingWork.Spec.Workload.Manifests = newWork.Spec.Workload.Manifests
 	if err := r.Client.Update(ctx, existingWork); err != nil {
 		klog.ErrorS(err, "Failed to update the work associated with the resourceSnapshot", "resourceSnapshot", resourceSnapshotObj, "work", workObj)