diff options
Diffstat (limited to 'src/monitor/pkg/controller/resourcebundlestate/daemonSet_controller.go')
-rw-r--r-- | src/monitor/pkg/controller/resourcebundlestate/daemonSet_controller.go | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/src/monitor/pkg/controller/resourcebundlestate/daemonSet_controller.go b/src/monitor/pkg/controller/resourcebundlestate/daemonSet_controller.go new file mode 100644 index 00000000..3ccb40ce --- /dev/null +++ b/src/monitor/pkg/controller/resourcebundlestate/daemonSet_controller.go @@ -0,0 +1,182 @@ +package resourcebundlestate + +import ( + "context" + "log" + + "github.com/onap/multicloud-k8s/src/monitor/pkg/apis/k8splugin/v1alpha1" + + appsv1 "k8s.io/api/apps/v1" + k8serrors "k8s.io/apimachinery/pkg/api/errors" + "k8s.io/apimachinery/pkg/types" + "sigs.k8s.io/controller-runtime/pkg/client" + "sigs.k8s.io/controller-runtime/pkg/controller" + "sigs.k8s.io/controller-runtime/pkg/handler" + "sigs.k8s.io/controller-runtime/pkg/manager" + "sigs.k8s.io/controller-runtime/pkg/reconcile" + "sigs.k8s.io/controller-runtime/pkg/source" +) + +// AddDaemonSetController the new controller to the controller manager +func AddDaemonSetController(mgr manager.Manager) error { + return addDaemonSetController(mgr, newDaemonSetReconciler(mgr)) +} + +func addDaemonSetController(mgr manager.Manager, r *daemonSetReconciler) error { + // Create a new controller + c, err := controller.New("Daemonset-controller", mgr, controller.Options{Reconciler: r}) + if err != nil { + return err + } + + // Watch for changes to secondar resource DaemonSets + // Predicate filters DaemonSets which don't have the k8splugin label + err = c.Watch(&source.Kind{Type: &appsv1.DaemonSet{}}, &handler.EnqueueRequestForObject{}, &daemonSetPredicate{}) + if err != nil { + return err + } + + return nil +} + +func newDaemonSetReconciler(m manager.Manager) *daemonSetReconciler { + return &daemonSetReconciler{client: m.GetClient()} +} + +type daemonSetReconciler struct { + client client.Client +} + +// Reconcile implements the loop that will update the ResourceBundleState CR +// whenever we get any updates from all the daemonSets we watch. +func (r *daemonSetReconciler) Reconcile(req reconcile.Request) (reconcile.Result, error) { + log.Printf("Updating ResourceBundleState for DaemonSet: %+v\n", req) + + ds := &appsv1.DaemonSet{} + err := r.client.Get(context.TODO(), req.NamespacedName, ds) + if err != nil { + if k8serrors.IsNotFound(err) { + log.Printf("DaemonSet not found: %+v. Remove from CR if it is stored there.\n", req.NamespacedName) + // Remove the DaemonSet's status from StatusList + // This can happen if we get the DeletionTimeStamp event + // after the DaemonSet has been deleted. + r.deleteDaemonSetFromAllCRs(req.NamespacedName) + return reconcile.Result{}, nil + } + log.Printf("Failed to get daemonSet: %+v\n", req.NamespacedName) + return reconcile.Result{}, err + } + + // Find the CRs which track this daemonSet via the labelselector + crSelector := returnLabel(ds.GetLabels()) + if crSelector == nil { + log.Println("We should not be here. The predicate should have filtered this DaemonSet") + } + + // Get the CRs which have this label and update them all + // Ideally, we will have only one CR, but there is nothing + // preventing the creation of multiple. + // TODO: Consider using an admission validating webook to prevent multiple + rbStatusList := &v1alpha1.ResourceBundleStateList{} + err = listResources(r.client, req.Namespace, crSelector, rbStatusList) + if err != nil || len(rbStatusList.Items) == 0 { + log.Printf("Did not find any CRs tracking this resource\n") + return reconcile.Result{}, nil + } + + err = r.updateCRs(rbStatusList, ds) + if err != nil { + // Requeue the update + return reconcile.Result{}, err + } + + return reconcile.Result{}, nil +} + +// deleteDaemonSetFromAllCRs deletes daemonSet status from all the CRs when the DaemonSet itself has been deleted +// and we have not handled the updateCRs yet. +// Since, we don't have the daemonSet's labels, we need to look at all the CRs in this namespace +func (r *daemonSetReconciler) deleteDaemonSetFromAllCRs(namespacedName types.NamespacedName) error { + + rbStatusList := &v1alpha1.ResourceBundleStateList{} + err := listResources(r.client, namespacedName.Namespace, nil, rbStatusList) + if err != nil || len(rbStatusList.Items) == 0 { + log.Printf("Did not find any CRs tracking this resource\n") + return nil + } + for _, cr := range rbStatusList.Items { + r.deleteFromSingleCR(&cr, namespacedName.Name) + } + + return nil +} + +func (r *daemonSetReconciler) updateCRs(crl *v1alpha1.ResourceBundleStateList, ds *appsv1.DaemonSet) error { + + for _, cr := range crl.Items { + // DaemonSet is not scheduled for deletion + if ds.DeletionTimestamp == nil { + err := r.updateSingleCR(&cr, ds) + if err != nil { + return err + } + } else { + // DaemonSet is scheduled for deletion + r.deleteFromSingleCR(&cr, ds.Name) + } + } + + return nil +} + +func (r *daemonSetReconciler) deleteFromSingleCR(cr *v1alpha1.ResourceBundleState, name string) error { + cr.Status.ResourceCount-- + length := len(cr.Status.DaemonSetStatuses) + for i, rstatus := range cr.Status.DaemonSetStatuses { + if rstatus.Name == name { + //Delete that status from the array + cr.Status.DaemonSetStatuses[i] = cr.Status.DaemonSetStatuses[length-1] + cr.Status.DaemonSetStatuses[length-1].Status = appsv1.DaemonSetStatus{} + cr.Status.DaemonSetStatuses = cr.Status.DaemonSetStatuses[:length-1] + return nil + } + } + + log.Println("Did not find a status for DaemonSet in CR") + return nil +} + +func (r *daemonSetReconciler) updateSingleCR(cr *v1alpha1.ResourceBundleState, ds *appsv1.DaemonSet) error { + + // Update status after searching for it in the list of resourceStatuses + for i, rstatus := range cr.Status.DaemonSetStatuses { + // Look for the status if we already have it in the CR + if rstatus.Name == ds.Name { + ds.Status.DeepCopyInto(&cr.Status.DaemonSetStatuses[i].Status) + err := r.client.Status().Update(context.TODO(), cr) + if err != nil { + log.Printf("failed to update rbstate: %v\n", err) + return err + } + return nil + } + } + + // Exited for loop with no status found + // Increment the number of tracked resources + cr.Status.ResourceCount++ + + // Add it to CR + cr.Status.DaemonSetStatuses = append(cr.Status.DaemonSetStatuses, appsv1.DaemonSet{ + ObjectMeta: ds.ObjectMeta, + Status: ds.Status, + }) + + err := r.client.Status().Update(context.TODO(), cr) + if err != nil { + log.Printf("failed to update rbstate: %v\n", err) + return err + } + + return nil +} |