SnapshotCache.go

Documentation: k8s.io/kubernetes/test/e2e/storage/drivers/csi-test/mock/cache

     1  /*
     2  Copyright 2021 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package cache
    18  
    19  import (
    20  	"strings"
    21  	"sync"
    22  
    23  	"github.com/container-storage-interface/spec/lib/go/csi"
    24  )
    25  
    26  type SnapshotCache interface {
    27  	Add(snapshot Snapshot)
    28  
    29  	Delete(i int)
    30  
    31  	List(ready bool) []csi.Snapshot
    32  
    33  	FindSnapshot(k, v string) (int, Snapshot)
    34  }
    35  
    36  type Snapshot struct {
    37  	Name        string
    38  	Parameters  map[string]string
    39  	SnapshotCSI csi.Snapshot
    40  }
    41  
    42  type snapshotCache struct {
    43  	snapshotsRWL sync.RWMutex
    44  	snapshots    []Snapshot
    45  }
    46  
    47  func NewSnapshotCache() SnapshotCache {
    48  	return &snapshotCache{
    49  		snapshots: make([]Snapshot, 0),
    50  	}
    51  }
    52  
    53  func (snap *snapshotCache) Add(snapshot Snapshot) {
    54  	snap.snapshotsRWL.Lock()
    55  	defer snap.snapshotsRWL.Unlock()
    56  
    57  	snap.snapshots = append(snap.snapshots, snapshot)
    58  }
    59  
    60  func (snap *snapshotCache) Delete(i int) {
    61  	snap.snapshotsRWL.Lock()
    62  	defer snap.snapshotsRWL.Unlock()
    63  
    64  	copy(snap.snapshots[i:], snap.snapshots[i+1:])
    65  	snap.snapshots = snap.snapshots[:len(snap.snapshots)-1]
    66  }
    67  
    68  func (snap *snapshotCache) List(ready bool) []csi.Snapshot {
    69  	snap.snapshotsRWL.RLock()
    70  	defer snap.snapshotsRWL.RUnlock()
    71  
    72  	snapshots := make([]csi.Snapshot, 0)
    73  	for _, v := range snap.snapshots {
    74  		if v.SnapshotCSI.GetReadyToUse() {
    75  			snapshots = append(snapshots, v.SnapshotCSI)
    76  		}
    77  	}
    78  
    79  	return snapshots
    80  }
    81  
    82  func (snap *snapshotCache) FindSnapshot(k, v string) (int, Snapshot) {
    83  	snap.snapshotsRWL.RLock()
    84  	defer snap.snapshotsRWL.RUnlock()
    85  
    86  	snapshotIdx := -1
    87  	for i, vi := range snap.snapshots {
    88  		switch k {
    89  		case "id":
    90  			if strings.EqualFold(v, vi.SnapshotCSI.GetSnapshotId()) {
    91  				return i, vi
    92  			}
    93  		case "sourceVolumeId":
    94  			if strings.EqualFold(v, vi.SnapshotCSI.SourceVolumeId) {
    95  				return i, vi
    96  			}
    97  		case "name":
    98  			if vi.Name == v {
    99  				return i, vi
   100  			}
   101  		}
   102  	}
   103  
   104  	return snapshotIdx, Snapshot{}
   105  }
   106
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