mirror of
https://github.com/ceph/ceph-csi.git
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61 lines
1.8 KiB
Go
61 lines
1.8 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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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 util
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import (
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"sync"
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"k8s.io/apimachinery/pkg/util/sets"
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)
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const (
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// VolumeOperationAlreadyExistsFmt string format to return for concurrent operation
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VolumeOperationAlreadyExistsFmt = "an operation with the given Volume ID %s already exists"
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// SnapshotOperationAlreadyExistsFmt string format to return for concurrent operation
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SnapshotOperationAlreadyExistsFmt = "an operation with the given Snapshot ID %s already exists"
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)
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// VolumeLocks implements a map with atomic operations. It stores a set of all volume IDs
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// with an ongoing operation.
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type VolumeLocks struct {
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locks sets.String
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mux sync.Mutex
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}
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// NewVolumeLocks returns new VolumeLocks
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func NewVolumeLocks() *VolumeLocks {
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return &VolumeLocks{
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locks: sets.NewString(),
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}
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}
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// TryAcquire tries to acquire the lock for operating on volumeID and returns true if successful.
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// If another operation is already using volumeID, returns false.
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func (vl *VolumeLocks) TryAcquire(volumeID string) bool {
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vl.mux.Lock()
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defer vl.mux.Unlock()
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if vl.locks.Has(volumeID) {
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return false
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}
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vl.locks.Insert(volumeID)
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return true
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}
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func (vl *VolumeLocks) Release(volumeID string) {
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vl.mux.Lock()
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defer vl.mux.Unlock()
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vl.locks.Delete(volumeID)
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}
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