From 54c2fbbfdf92806bd7ca4b52fe09a63310d522ec Mon Sep 17 00:00:00 2001 From: nikhiljindal Date: Sun, 6 Nov 2016 14:14:44 -0800 Subject: [PATCH] Updating federation replicaset controller to support cascading deletion --- .../replicaset/replicasetcontroller.go | 122 +++++++++++++++++- 1 file changed, 120 insertions(+), 2 deletions(-) diff --git a/federation/pkg/federation-controller/replicaset/replicasetcontroller.go b/federation/pkg/federation-controller/replicaset/replicasetcontroller.go index 4e114edb165..75984fd1f42 100644 --- a/federation/pkg/federation-controller/replicaset/replicasetcontroller.go +++ b/federation/pkg/federation-controller/replicaset/replicasetcontroller.go @@ -29,16 +29,19 @@ import ( fedv1 "k8s.io/kubernetes/federation/apis/federation/v1beta1" fedclientset "k8s.io/kubernetes/federation/client/clientset_generated/federation_release_1_5" fedutil "k8s.io/kubernetes/federation/pkg/federation-controller/util" + "k8s.io/kubernetes/federation/pkg/federation-controller/util/deletionhelper" "k8s.io/kubernetes/federation/pkg/federation-controller/util/eventsink" "k8s.io/kubernetes/federation/pkg/federation-controller/util/planner" "k8s.io/kubernetes/federation/pkg/federation-controller/util/podanalyzer" "k8s.io/kubernetes/pkg/api" + "k8s.io/kubernetes/pkg/api/errors" apiv1 "k8s.io/kubernetes/pkg/api/v1" extensionsv1 "k8s.io/kubernetes/pkg/apis/extensions/v1beta1" "k8s.io/kubernetes/pkg/client/cache" kubeclientset "k8s.io/kubernetes/pkg/client/clientset_generated/release_1_5" "k8s.io/kubernetes/pkg/client/record" "k8s.io/kubernetes/pkg/controller" + "k8s.io/kubernetes/pkg/conversion" "k8s.io/kubernetes/pkg/runtime" "k8s.io/kubernetes/pkg/util/flowcontrol" "k8s.io/kubernetes/pkg/util/wait" @@ -94,6 +97,8 @@ type ReplicaSetController struct { // For events eventRecorder record.EventRecorder + deletionHelper *deletionhelper.DeletionHelper + defaultPlanner *planner.Planner } @@ -205,9 +210,72 @@ func NewReplicaSetController(federationClient fedclientset.Interface) *ReplicaSe return err }) + frsc.deletionHelper = deletionhelper.NewDeletionHelper( + frsc.hasFinalizerFunc, + frsc.removeFinalizerFunc, + frsc.addFinalizerFunc, + // objNameFunc + func(obj runtime.Object) string { + replicaset := obj.(*extensionsv1.ReplicaSet) + return replicaset.Name + }, + updateTimeout, + frsc.eventRecorder, + frsc.fedReplicaSetInformer, + frsc.fedUpdater, + ) + return frsc } +// Returns true if the given object has the given finalizer in its ObjectMeta. +func (frsc *ReplicaSetController) hasFinalizerFunc(obj runtime.Object, finalizer string) bool { + replicaset := obj.(*extensionsv1.ReplicaSet) + for i := range replicaset.ObjectMeta.Finalizers { + if string(replicaset.ObjectMeta.Finalizers[i]) == finalizer { + return true + } + } + return false +} + +// Removes the finalizer from the given objects ObjectMeta. +// Assumes that the given object is a replicaset. +func (frsc *ReplicaSetController) removeFinalizerFunc(obj runtime.Object, finalizer string) (runtime.Object, error) { + replicaset := obj.(*extensionsv1.ReplicaSet) + newFinalizers := []string{} + hasFinalizer := false + for i := range replicaset.ObjectMeta.Finalizers { + if string(replicaset.ObjectMeta.Finalizers[i]) != finalizer { + newFinalizers = append(newFinalizers, replicaset.ObjectMeta.Finalizers[i]) + } else { + hasFinalizer = true + } + } + if !hasFinalizer { + // Nothing to do. + return obj, nil + } + replicaset.ObjectMeta.Finalizers = newFinalizers + replicaset, err := frsc.fedClient.Extensions().ReplicaSets(replicaset.Namespace).Update(replicaset) + if err != nil { + return nil, fmt.Errorf("failed to remove finalizer %s from replicaset %s: %v", finalizer, replicaset.Name, err) + } + return replicaset, nil +} + +// Adds the given finalizer to the given objects ObjectMeta. +// Assumes that the given object is a replicaset. +func (frsc *ReplicaSetController) addFinalizerFunc(obj runtime.Object, finalizer string) (runtime.Object, error) { + replicaset := obj.(*extensionsv1.ReplicaSet) + replicaset.ObjectMeta.Finalizers = append(replicaset.ObjectMeta.Finalizers, finalizer) + replicaset, err := frsc.fedClient.Extensions().ReplicaSets(replicaset.Namespace).Update(replicaset) + if err != nil { + return nil, fmt.Errorf("failed to add finalizer %s to replicaset %s: %v", finalizer, replicaset.Name, err) + } + return replicaset, nil +} + func (frsc *ReplicaSetController) Run(workers int, stopCh <-chan struct{}) { go frsc.replicaSetController.Run(stopCh) frsc.fedReplicaSetInformer.Start() @@ -413,7 +481,7 @@ func (frsc *ReplicaSetController) reconcileReplicaSet(key string) (reconciliatio startTime := time.Now() defer glog.V(4).Infof("Finished reconcile replicaset %q (%v)", key, time.Now().Sub(startTime)) - obj, exists, err := frsc.replicaSetStore.Indexer.GetByKey(key) + objFromStore, exists, err := frsc.replicaSetStore.Indexer.GetByKey(key) if err != nil { return statusError, err } @@ -421,7 +489,37 @@ func (frsc *ReplicaSetController) reconcileReplicaSet(key string) (reconciliatio // don't delete local replicasets for now. Do not reconcile it anymore. return statusAllOk, nil } - frs := obj.(*extensionsv1.ReplicaSet) + obj, err := conversion.NewCloner().DeepCopy(objFromStore) + frs, ok := obj.(*extensionsv1.ReplicaSet) + if err != nil || !ok { + glog.Errorf("Error in retrieving obj from store: %v, %v", ok, err) + frsc.deliverReplicaSetByKey(key, 0, true) + return statusError, err + } + if frs.DeletionTimestamp != nil { + if err := frsc.delete(frs); err != nil { + glog.Errorf("Failed to delete %s: %v", frs, err) + frsc.eventRecorder.Eventf(frs, api.EventTypeNormal, "DeleteFailed", + "ReplicaSet delete failed: %v", err) + frsc.deliverReplicaSetByKey(key, 0, true) + return statusError, err + } + return statusAllOk, nil + } + + glog.V(3).Infof("Ensuring delete object from underlying clusters finalizer for replicaset: %s", + frs.Name) + // Add the required finalizers before creating a replicaset in underlying clusters. + updatedRsObj, err := frsc.deletionHelper.EnsureFinalizers(frs) + if err != nil { + glog.Errorf("Failed to ensure delete object from underlying clusters finalizer in replicaset %s: %v", + frs.Name, err) + frsc.deliverReplicaSetByKey(key, 0, false) + return statusError, err + } + frs = updatedRsObj.(*extensionsv1.ReplicaSet) + + glog.V(3).Infof("Syncing replicaset %s in underlying clusters", frs.Name) clusters, err := frsc.fedReplicaSetInformer.GetReadyClusters() if err != nil { @@ -535,3 +633,23 @@ func (frsc *ReplicaSetController) reconcileReplicaSetsOnClusterChange() { frsc.deliverReplicaSetByKey(key, 0, false) } } + +// delete deletes the given replicaset or returns error if the deletion was not complete. +func (frsc *ReplicaSetController) delete(replicaset *extensionsv1.ReplicaSet) error { + glog.V(3).Infof("Handling deletion of replicaset: %v", *replicaset) + _, err := frsc.deletionHelper.HandleObjectInUnderlyingClusters(replicaset) + if err != nil { + return err + } + + err = frsc.fedClient.Extensions().ReplicaSets(replicaset.Namespace).Delete(replicaset.Name, nil) + if err != nil { + // Its all good if the error is not found error. That means it is deleted already and we do not have to do anything. + // This is expected when we are processing an update as a result of replicaset finalizer deletion. + // The process that deleted the last finalizer is also going to delete the replicaset and we do not have to do anything. + if !errors.IsNotFound(err) { + return fmt.Errorf("failed to delete replicaset: %v", err) + } + } + return nil +}