-
Notifications
You must be signed in to change notification settings - Fork 13
/
memory.go
155 lines (132 loc) · 3.39 KB
/
memory.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
/*
Copyright 2021 The cert-manager Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package storage
import (
"encoding/json"
"sync"
apiequality "k8s.io/apimachinery/pkg/api/equality"
"github.com/cert-manager/csi-lib/metadata"
)
type MemoryFS struct {
files map[string]map[string][]byte
lock sync.Mutex
}
var _ Interface = &MemoryFS{}
func NewMemoryFS() *MemoryFS {
return &MemoryFS{
files: make(map[string]map[string][]byte),
}
}
func (m *MemoryFS) PathForVolume(volumeID string) string {
m.lock.Lock()
defer m.lock.Unlock()
return volumeID
}
func (m *MemoryFS) RemoveVolume(volumeID string) error {
m.lock.Lock()
defer m.lock.Unlock()
delete(m.files, volumeID)
return nil
}
func (m *MemoryFS) ReadMetadata(volumeID string) (metadata.Metadata, error) {
m.lock.Lock()
defer m.lock.Unlock()
volMap, ok := m.files[volumeID]
if !ok {
return metadata.Metadata{}, ErrNotFound
}
metaFile, ok := volMap["metadata.json"]
if !ok {
return metadata.Metadata{}, ErrNotFound
}
meta := &metadata.Metadata{}
if err := json.Unmarshal(metaFile, meta); err != nil {
return metadata.Metadata{}, ErrInvalidJSON
}
return *meta, nil
}
func (m *MemoryFS) ListVolumes() ([]string, error) {
m.lock.Lock()
defer m.lock.Unlock()
var vols []string
for vol := range m.files {
vols = append(vols, vol)
}
return vols, nil
}
func (m *MemoryFS) WriteMetadata(volumeID string, meta metadata.Metadata) error {
m.lock.Lock()
defer m.lock.Unlock()
vol, ok := m.files[volumeID]
if !ok {
return ErrNotFound
}
metaJSON, err := json.Marshal(meta)
if err != nil {
return err
}
vol["metadata.json"] = metaJSON
return nil
}
func (m *MemoryFS) RegisterMetadata(meta metadata.Metadata) (bool, error) {
m.lock.Lock()
defer m.lock.Unlock()
vol, ok := m.files[meta.VolumeID]
if !ok {
vol = make(map[string][]byte)
m.files[meta.VolumeID] = vol
}
existingMetaJSON, ok := vol["metadata.json"]
if ok {
var existingMeta metadata.Metadata
if err := json.Unmarshal(existingMetaJSON, &existingMeta); err != nil {
return false, err
}
// If the volume context hasn't changed in the existing metadata, no need to write
if apiequality.Semantic.DeepEqual(existingMeta.VolumeContext, meta.VolumeContext) {
return false, nil
}
}
metaJSON, err := json.Marshal(meta)
if err != nil {
return false, err
}
vol["metadata.json"] = metaJSON
return true, nil
}
func (m *MemoryFS) WriteFiles(meta metadata.Metadata, files map[string][]byte) error {
m.lock.Lock()
defer m.lock.Unlock()
vol, ok := m.files[meta.VolumeID]
if !ok {
return ErrNotFound
}
for k, v := range files {
vol[k] = v
}
return nil
}
func (m *MemoryFS) ReadFiles(volumeID string) (map[string][]byte, error) {
m.lock.Lock()
defer m.lock.Unlock()
vol, ok := m.files[volumeID]
if !ok {
return nil, ErrNotFound
}
// make a copy of the map to ensure no races can occur
cpy := make(map[string][]byte)
for k, v := range vol {
cpy[k] = v
}
return cpy, nil
}