Clean up unused Tower tags regularly

controllers/elfcluster_controller.go

@@ -279,6 +279,32 @@ func (r *ElfClusterReconciler) reconcileDeleteLabel(ctx *context.ClusterContext,
 	return nil
 }
 
+// cleanLabels cleans unused labels for Tower every day.
+// If an error is encountered during the cleanup process,
+// it will not be retried and will be started again in the next reconcile.
+func (r *ElfClusterReconciler) cleanLabels(ctx *context.ClusterContext) {
+	// Locking ensures that only one coroutine cleans at the same time,
+	if ok := acquireTicketForGCTowerLabels(ctx.ElfCluster.Spec.Tower.Server); ok {
+		defer releaseTicketForForGCTowerLabels(ctx.ElfCluster.Spec.Tower.Server)
+	} else {
+		return
+	}
+
+	ctx.Logger.V(1).Info(fmt.Sprintf("Cleaning labels for Tower %s", ctx.ElfCluster.Spec.Tower.Server))
+
+	keys := []string{towerresources.GetVMLabelClusterName(), towerresources.GetVMLabelVIP(), towerresources.GetVMLabelNamespace(), towerresources.GetVMLabelManaged()}
+	labelIDs, err := ctx.VMService.CleanLabels(keys)
+	if err != nil {
+		ctx.Logger.Error(err, fmt.Sprintf("failed to clean labels for Tower %s", ctx.ElfCluster.Spec.Tower.Server))
+
+		return
+	}
+
+	recordGCTimeForTowerLabels(ctx.ElfCluster.Spec.Tower.Server)
+
+	ctx.Logger.V(1).Info(fmt.Sprintf("Labels of Tower %s are cleaned successfully", ctx.ElfCluster.Spec.Tower.Server), "labelCount", len(labelIDs))
+}
+
 func (r *ElfClusterReconciler) reconcileNormal(ctx *context.ClusterContext) (reconcile.Result, error) { //nolint:unparam
 	ctx.Logger.Info("Reconciling ElfCluster")
 
@@ -298,6 +324,8 @@ func (r *ElfClusterReconciler) reconcileNormal(ctx *context.ClusterContext) (rec
 		return reconcile.Result{}, nil
 	}
 
+	r.cleanLabels(ctx)
+
 	// Wait until the API server is online and accessible.
 	if !r.isAPIServerOnline(ctx) {
 		return reconcile.Result{}, nil

controllers/elfcluster_controller_test.go

@@ -135,6 +135,9 @@ var _ = Describe("ElfClusterReconciler", func() {
 			}
 			fake.InitClusterOwnerReferences(ctrlContext, elfCluster, cluster)
 
+			keys := []string{towerresources.GetVMLabelClusterName(), towerresources.GetVMLabelVIP(), towerresources.GetVMLabelNamespace(), towerresources.GetVMLabelManaged()}
+			mockVMService.EXPECT().CleanLabels(keys).Return(nil, nil)
+
 			elfClusterKey := capiutil.ObjectKey(elfCluster)
 			reconciler := &ElfClusterReconciler{ControllerContext: ctrlContext, NewVMService: mockNewVMService}
 			_, _ = reconciler.Reconcile(ctx, ctrl.Request{NamespacedName: elfClusterKey})

controllers/vm_limiter.go

@@ -144,6 +144,61 @@ func getKeyForVMDuplicate(name string) string {
 	return fmt.Sprintf("vm:duplicate:%s", name)
 }
 
+/* Label */
+
+var labelOperationLock sync.Mutex
+
+func getKeyForGCLabel(tower string) string {
+	return fmt.Sprintf("label:gc:%s", tower)
+}
+
+func getKeyForGCLabelTime(tower string) string {
+	return fmt.Sprintf("label:gc:time:%s", tower)
+}
+
+// acquireTicketForGCTowerLabels returns whether label gc operation can be performed.
+func acquireTicketForGCTowerLabels(tower string) bool {
+	labelOperationLock.Lock()
+	defer labelOperationLock.Unlock()
+
+	if _, found := inMemoryCache.Get(getKeyForGCLabel(tower)); found {
+		return false
+	}
+
+	key := getKeyForGCLabelTime(tower)
+	if val, found := inMemoryCache.Get(key); found {
+		lastGCTime, ok := val.(time.Time)
+		if ok {
+			if time.Now().Before(lastGCTime.Add(24 * time.Hour)) {
+				return false
+			}
+		} else {
+			// Delete unexpected data.
+			inMemoryCache.Delete(key)
+		}
+	}
+
+	inMemoryCache.Set(getKeyForGCLabel(tower), nil, cache.NoExpiration)
+
+	return true
+}
+
+// releaseTicketForForGCTowerLabels releases the Tower whose labels are being cleared.
+func releaseTicketForForGCTowerLabels(tower string) {
+	labelOperationLock.Lock()
+	defer labelOperationLock.Unlock()
+
+	inMemoryCache.Delete(getKeyForGCLabel(tower))
+}
+
+// recordGCTimeForTowerLabels records the last GC label time of the specified Tower.
+func recordGCTimeForTowerLabels(tower string) {
+	labelOperationLock.Lock()
+	defer labelOperationLock.Unlock()
+
+	inMemoryCache.Set(getKeyForGCLabelTime(tower), time.Now(), cache.NoExpiration)
+}
+
 /* GPU */
 
 type lockedGPUDevice struct {

pkg/service/vm.go

@@ -67,6 +67,7 @@ type VMService interface {
 	GetVlan(id string) (*models.Vlan, error)
 	UpsertLabel(key, value string) (*models.Label, error)
 	DeleteLabel(key, value string, strict bool) (string, error)
+	CleanLabels(keys []string) ([]string, error)
 	AddLabelsToVM(vmID string, labels []string) (*models.Task, error)
 	CreateVMPlacementGroup(name, clusterID string, vmPolicy models.VMVMPolicy) (*models.WithTaskVMPlacementGroup, error)
 	GetVMPlacementGroup(name string) (*models.VMPlacementGroup, error)
@@ -769,7 +770,7 @@ func (svr *TowerVMService) DeleteLabel(key, value string, strict bool) (string,
 	if strict {
 		deleteLabelParams.RequestBody.Where.AND = append(
 			deleteLabelParams.RequestBody.Where.AND,
-			&models.LabelWhereInput{VMNum: TowerInt32(0)},
+			&models.LabelWhereInput{TotalNum: TowerInt32(0)},
 		)
 	}
 
@@ -785,6 +786,30 @@ func (svr *TowerVMService) DeleteLabel(key, value string, strict bool) (string,
 	return *deleteLabelResp.Payload[0].Data.ID, nil
 }
 
+// CleanLabels deletes specified unused labels.
+// CleanLabels is used to clean unused labels regularly and should not be called frequently.
+func (svr *TowerVMService) CleanLabels(keys []string) ([]string, error) {
+	deleteLabelParams := clientlabel.NewDeleteLabelParams()
+	deleteLabelParams.RequestBody = &models.LabelDeletionParams{
+		Where: &models.LabelWhereInput{
+			KeyIn:        keys,
+			CreatedAtLte: TowerString(time.Now().Add(-24 * time.Hour).UTC().Format(time.RFC3339)),
+		},
+	}
+
+	deleteLabelResp, err := svr.Session.Label.DeleteLabel(deleteLabelParams)
+	if err != nil {
+		return nil, err
+	}
+
+	labelIDs := make([]string, len(deleteLabelResp.Payload))
+	for i := 0; i < len(deleteLabelResp.Payload); i++ {
+		labelIDs[i] = *deleteLabelResp.Payload[i].Data.ID
+	}
+
+	return labelIDs, nil
+}
+
 // AddLabelsToVM adds a label to a VM.
 func (svr *TowerVMService) AddLabelsToVM(vmID string, labelIds []string) (*models.Task, error) {
 	addLabelsParams := clientlabel.NewAddLabelsToResourcesParams()