-
Notifications
You must be signed in to change notification settings - Fork 27
/
snapshot.go
274 lines (233 loc) · 6.23 KB
/
snapshot.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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
/*
* knoxite
* Copyright (c) 2016-2018, Christian Muehlhaeuser <[email protected]>
*
* For license see LICENSE
*/
package knoxite
import (
"math"
"os"
"path/filepath"
"strings"
"sync"
"time"
uuid "github.com/nu7hatch/gouuid"
)
// A Snapshot is a compilation of one or many archives.
type Snapshot struct {
mut sync.Mutex
ID string `json:"id"`
Date time.Time `json:"date"`
Description string `json:"description"`
Stats Stats `json:"stats"`
Archives map[string]*Archive `json:"items"`
}
// StoreOptions holds all the storage settings for a snapshot operation.
type StoreOptions struct {
CWD string
Paths []string
Excludes []string
Compress uint16
Encrypt uint16
Pedantic bool
DataParts uint
ParityParts uint
}
// NewSnapshot creates a new snapshot.
func NewSnapshot(description string) (*Snapshot, error) {
snapshot := Snapshot{
Date: time.Now(),
Description: description,
Archives: make(map[string]*Archive),
}
u, err := uuid.NewV4()
if err != nil {
return &snapshot, err
}
snapshot.ID = u.String()[:8]
return &snapshot, nil
}
func (snapshot *Snapshot) gatherTargetInformation(cwd string, paths []string, excludes []string) <-chan ArchiveResult {
ch := make(chan ArchiveResult)
var wg sync.WaitGroup
results := func(rr []ArchiveResult) {
go func() {
for _, r := range rr {
ch <- r
wg.Done()
}
}()
}
go func() {
var archives []ArchiveResult
for _, path := range paths {
ff := findFiles(path, excludes)
for result := range ff {
if result.Error == nil {
rel, err := filepath.Rel(cwd, result.Archive.Path)
if err == nil && !strings.HasPrefix(rel, ".."+string(os.PathSeparator)) {
result.Archive.Path = rel
}
if isSpecialPath(result.Archive.Path) {
continue
}
// update scan statistics
snapshot.mut.Lock()
snapshot.Stats.Size += result.Archive.Size
switch result.Archive.Type {
case Directory:
snapshot.Stats.Dirs++
case File:
snapshot.Stats.Files++
case SymLink:
snapshot.Stats.SymLinks++
}
snapshot.mut.Unlock()
}
wg.Add(1)
archives = append(archives, result)
if len(archives) >= 128 {
results(archives)
archives = []ArchiveResult{}
}
}
}
results(archives)
wg.Wait()
close(ch)
}()
return ch
}
// Add adds a path to a Snapshot.
func (snapshot *Snapshot) Add(repository Repository, chunkIndex *ChunkIndex, opts StoreOptions) <-chan Progress {
progress := make(chan Progress)
ch := snapshot.gatherTargetInformation(opts.CWD, opts.Paths, opts.Excludes)
go func() {
defer close(progress)
for result := range ch {
if result.Error != nil {
p := newProgressError(result.Error)
p.Path = result.Archive.Path
progress <- p
if opts.Pedantic {
break
}
continue
}
archive := result.Archive
rel, err := filepath.Rel(opts.CWD, archive.Path)
if err == nil && !strings.HasPrefix(rel, ".."+string(os.PathSeparator)) {
archive.Path = rel
}
if isSpecialPath(archive.Path) {
continue
}
p := newProgress(archive)
snapshot.mut.Lock()
p.TotalStatistics = snapshot.Stats
snapshot.mut.Unlock()
progress <- p
if archive.Type == File {
opts.DataParts = uint(math.Max(1, float64(opts.DataParts)))
chunkchan, err := chunkFile(archive.Path, repository.Key, opts)
if err != nil {
if os.IsNotExist(err) {
// if this file has already been deleted before we could backup it, we can gracefully ignore it and continue
continue
}
p = newProgressError(err)
p.Path = archive.Path
progress <- p
if opts.Pedantic {
break
}
continue
}
archive.Encrypted = opts.Encrypt
archive.Compressed = opts.Compress
for cd := range chunkchan {
if cd.Error != nil {
p = newProgressError(err)
p.Path = archive.Path
progress <- p
if opts.Pedantic {
return
}
continue
}
chunk := cd.Chunk
// fmt.Printf("\tSplit %s (#%d, %d bytes), compression: %s, encryption: %s, hash: %s\n", id.Path, cd.Num, cd.Size, CompressionText(cd.Compressed), EncryptionText(cd.Encrypted), cd.Hash)
// store this chunk
n, err := repository.backend.StoreChunk(chunk)
if err != nil {
p = newProgressError(err)
p.Path = archive.Path
progress <- p
if opts.Pedantic {
return
}
continue
}
// release the memory, we don't need the data anymore
chunk.Data = &[][]byte{}
archive.Chunks = append(archive.Chunks, chunk)
archive.StorageSize += n
p.CurrentItemStats.StorageSize = archive.StorageSize
p.CurrentItemStats.Transferred += uint64(chunk.OriginalSize)
snapshot.Stats.Transferred += uint64(chunk.OriginalSize)
snapshot.Stats.StorageSize += n
snapshot.mut.Lock()
p.TotalStatistics = snapshot.Stats
snapshot.mut.Unlock()
progress <- p
}
}
snapshot.AddArchive(archive)
chunkIndex.AddArchive(archive, snapshot.ID)
}
}()
return progress
}
// Clone clones a snapshot.
func (snapshot *Snapshot) Clone() (*Snapshot, error) {
s, err := NewSnapshot(snapshot.Description)
if err != nil {
return s, err
}
s.Stats = snapshot.Stats
s.Archives = snapshot.Archives
return s, nil
}
// openSnapshot opens an existing snapshot.
func openSnapshot(id string, repository *Repository) (*Snapshot, error) {
snapshot := Snapshot{
Archives: make(map[string]*Archive),
}
b, err := repository.backend.LoadSnapshot(id)
if err != nil {
return &snapshot, err
}
pipe, err := NewDecodingPipeline(CompressionLZMA, EncryptionAES, repository.Key)
if err != nil {
return &snapshot, err
}
err = pipe.Decode(b, &snapshot)
return &snapshot, err
}
// Save writes a snapshot's metadata.
func (snapshot *Snapshot) Save(repository *Repository) error {
pipe, err := NewEncodingPipeline(CompressionLZMA, EncryptionAES, repository.Key)
if err != nil {
return err
}
b, err := pipe.Encode(snapshot)
if err != nil {
return err
}
return repository.backend.SaveSnapshot(snapshot.ID, b)
}
// AddArchive adds an archive to a snapshot.
func (snapshot *Snapshot) AddArchive(archive *Archive) {
snapshot.Archives[archive.Path] = archive
}