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7e4797f588
This avoids an unnecessary apiserver List call when the backup reconciler is already at capacity. Signed-off-by: Scott Seago <sseago@redhat.com>
117 lines
3.3 KiB
Go
117 lines
3.3 KiB
Go
/*
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Copyright 2018 the Velero contributors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package controller
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import (
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"fmt"
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"sync"
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"k8s.io/apimachinery/pkg/util/sets"
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)
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// BackupTracker keeps track of in-progress backups.
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type BackupTracker interface {
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// Add informs the tracker that a backup is ReadyToStart.
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AddReadyToStart(ns, name string)
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// Add informs the tracker that a backup is in progress.
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Add(ns, name string)
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// Add informs the tracker that a backup has moved beyond InProgress
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AddPostProcessing(ns, name string)
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// Delete informs the tracker that a backup has reached a terminal state.
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Delete(ns, name string)
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// Contains returns true if backup is InProgress or post-InProgress
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Contains(ns, name string) bool
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// RunningCount returns the number of backups which are ReadyToStart or InProgress
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RunningCount() int
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}
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type backupTracker struct {
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lock sync.RWMutex
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readyToStartBackups sets.Set[string]
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inProgressBackups sets.Set[string]
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postProgressBackups sets.Set[string]
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}
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// NewBackupTracker returns a new BackupTracker.
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func NewBackupTracker() BackupTracker {
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return &backupTracker{
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readyToStartBackups: sets.New[string](),
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inProgressBackups: sets.New[string](),
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postProgressBackups: sets.New[string](),
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}
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}
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func (bt *backupTracker) AddReadyToStart(ns, name string) {
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bt.lock.Lock()
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defer bt.lock.Unlock()
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bt.readyToStartBackups.Insert(backupTrackerKey(ns, name))
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}
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func (bt *backupTracker) Add(ns, name string) {
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bt.lock.Lock()
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defer bt.lock.Unlock()
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key := backupTrackerKey(ns, name)
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bt.readyToStartBackups.Delete(key)
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bt.inProgressBackups.Insert(key)
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}
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func (bt *backupTracker) AddPostProcessing(ns, name string) {
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bt.lock.Lock()
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defer bt.lock.Unlock()
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key := backupTrackerKey(ns, name)
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bt.readyToStartBackups.Delete(key)
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bt.inProgressBackups.Delete(key)
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bt.postProgressBackups.Insert(key)
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}
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func (bt *backupTracker) Delete(ns, name string) {
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bt.lock.Lock()
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defer bt.lock.Unlock()
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key := backupTrackerKey(ns, name)
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bt.readyToStartBackups.Delete(key)
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bt.inProgressBackups.Delete(key)
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bt.postProgressBackups.Delete(key)
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}
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// Contains returns true if backup is InProgress or post-InProgress
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// ignores ReadyToStart, since this is used to determine whether
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// a backup is in progress and thus not able to be deleted now.
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func (bt *backupTracker) Contains(ns, name string) bool {
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bt.lock.RLock()
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defer bt.lock.RUnlock()
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key := backupTrackerKey(ns, name)
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return bt.inProgressBackups.Has(key) || bt.postProgressBackups.Has(key)
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}
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// RunningCount returns the number of backups which are ReadyToStart or InProgress
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// used by queue controller to determine whether a new backup can be started.
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func (bt *backupTracker) RunningCount() int {
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bt.lock.RLock()
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defer bt.lock.RUnlock()
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return bt.inProgressBackups.Len() + bt.readyToStartBackups.Len()
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}
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func backupTrackerKey(ns, name string) string {
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return fmt.Sprintf("%s/%s", ns, name)
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}
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