forked from kaiakz/rsync-os
/
receiver.go
434 lines (381 loc) · 10 KB
/
receiver.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
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
package rsync
import (
"bufio"
"bytes"
"errors"
"fmt"
"github.com/sirupsen/logrus"
"io"
"io/ioutil"
"os"
"sort"
"time"
"github.com/sihuan/ubuffer"
)
/* Receiver:
1. Receive File list
2. Request files by sending files' index
3. Receive Files, pass the files to storage
*/
type Receiver struct {
conn *Conn
module string
path string
seed int32
lVer int32
rVer int32
storage FS
logger *logrus.Logger
}
func (r *Receiver) BuildArgs() string {
return ""
}
// DeMux was started here
func (r *Receiver) StartMuxIn() {
r.conn.reader = NewMuxReaderV0(r.conn.reader)
}
func (r *Receiver) SendExclusions() error {
// Send exclusion
return r.conn.WriteInt(EXCLUSION_END)
}
// Return a filelist from remote
func (r *Receiver) RecvFileList() (FileList, map[string][]byte, error) {
filelist := make(FileList, 0, 1*M)
symlinks := make(map[string][]byte)
for {
flags, err := r.conn.ReadByte()
if err != nil {
return filelist, symlinks, err
}
if flags == FLIST_END {
break
}
//fmt.Printf("[%d]\n", flags)
lastIndex := len(filelist) - 1
var partial, pathlen uint32 = 0, 0
/*
* Read our filename.
* If we have FLIST_NAME_SAME, we inherit some of the last
* transmitted name.
* If we have FLIST_NAME_LONG, then the string length is greater
* than byte-size.
*/
if (flags & FLIST_NAME_SAME) != 0 {
val, err := r.conn.ReadByte()
if err != nil {
return filelist, symlinks, err
}
partial = uint32(val)
//fmt.Println("Partical", partial)
}
/* Get the (possibly-remaining) filename length. */
if (flags & FLIST_NAME_LONG) != 0 {
val, err := r.conn.ReadInt()
if err != nil {
return filelist, symlinks, err
}
pathlen = uint32(val) // can't use for rsync 31
} else {
val, err := r.conn.ReadByte()
if err != nil {
return filelist, symlinks, err
}
pathlen = uint32(val)
}
//fmt.Println("PathLen", pathlen)
/* Allocate our full filename length. */
/* FIXME: maximum pathname length. */
// TODO: if pathlen + partical == 0
// malloc len error?
p := make([]byte, pathlen)
_, err = io.ReadFull(r.conn, p)
if err != nil {
return filelist, symlinks, err
}
path := make([]byte, 0, partial+pathlen)
/* If so, use last */
if (flags & FLIST_NAME_SAME) != 0 { // FLIST_NAME_SAME
last := filelist[lastIndex]
path = append(path, last.Path[0:partial]...)
}
path = append(path, p...)
//fmt.Println("Path ", string(path))
size, err := r.conn.ReadVarint()
if err != nil {
return filelist, symlinks, err
}
//fmt.Println("Size ", size)
/* Read the modification time. */
var mtime int32
if (flags & FLIST_TIME_SAME) == 0 {
mtime, err = r.conn.ReadInt()
if err != nil {
return filelist, symlinks, err
}
} else {
mtime = filelist[lastIndex].Mtime
}
//fmt.Println("MTIME ", mtime)
/* Read the file mode. */
var mode FileMode
if (flags & FLIST_MODE_SAME) == 0 {
val, err := r.conn.ReadInt()
if err != nil {
return filelist, symlinks, err
}
mode = FileMode(val)
} else {
mode = filelist[lastIndex].Mode
}
//fmt.Println("Mode", uint32(mode))
// TODO: Sym link
if ((mode & 32768) != 0) && ((mode & 8192) != 0) {
sllen, err := r.conn.ReadInt()
if err != nil {
return filelist, symlinks, err
}
slink := make([]byte, sllen)
_, err = io.ReadFull(r.conn, slink)
symlinks[string(path)] = slink
if err != nil {
return filelist, symlinks, errors.New("Failed to read symlink")
}
//fmt.Println("Symbolic Len:", len, "Content:", slink)
}
if r.logger.Level == logrus.DebugLevel {
fmt.Fprintln(r.logger.Out,"@", string(path), mode, size, mtime)
}
filelist = append(filelist, FileInfo{
Path: path,
Size: size,
Mtime: mtime,
Mode: mode,
})
}
// Sort the filelist lexicographically
sort.Sort(filelist)
return filelist, symlinks, nil
}
// Generator: handle files: if it's a regular file, send its index. Otherwise, put them to storage
func (r *Receiver) Generator(remoteList FileList, downloadList []int, symlinks map[string][]byte) error {
emptyBlocks := make([]byte, 16) // 4 + 4 + 4 + 4 bytes, all bytes set to 0
content := new(bytes.Buffer)
for _, v := range downloadList {
if remoteList[v].Mode.IsREG() {
if err := r.conn.WriteInt(int32(v)); err != nil {
r.logger.Error("Failed to send index")
return err
}
//fmt.Println("Request: ", string(remoteList[v].Path), uint32(remoteList[v].Mode))
if _, err := r.conn.Write(emptyBlocks); err != nil {
return err
}
} else {
// TODO: Supports more file mode
// EXPERIMENTAL
// Handle folders & symbol links
content.Reset()
size := remoteList[v].Size
if remoteList[v].Mode.IsLNK() {
if _, err := content.Write(symlinks[string(remoteList[v].Path)]); err != nil {
return err
}
size = int64(content.Len())
}
if _, err := r.storage.Put(string(remoteList[v].Path), content, size, FileMetadata{
Mtime: remoteList[v].Mtime,
Mode: remoteList[v].Mode,
}); err != nil {
return err
}
}
}
// Send -1 to finish, then start to download
if err := r.conn.WriteInt(INDEX_END); err != nil {
r.logger.Error("Can't send INDEX_END")
return err
}
r.logger.Info("Request completed")
startTime := time.Now()
err := r.FileDownloader(remoteList[:])
r.logger.Info("Downloaded duration: ", time.Since(startTime))
return err
}
// TODO: It is better to update files in goroutine
func (r *Receiver) FileDownloader(localList FileList) error {
tempDir, err := ioutil.TempDir(".", "syncTemp-")
if err != nil {
return err
}
defer os.RemoveAll(tempDir)
rmd4 := make([]byte, 16)
for {
index, err := r.conn.ReadInt()
if err != nil {
return err
}
if index == INDEX_END { // -1 means the end of transfer files
return nil
}
//fmt.Println("INDEX:", index)
count, err := r.conn.ReadInt() /* block count */
if err != nil {
return err
}
blen, err := r.conn.ReadInt() /* block length */
if err != nil {
return err
}
clen, err := r.conn.ReadInt() /* checksum length */
if err != nil {
return err
}
remainder, err := r.conn.ReadInt() /* block remainder */
if err != nil {
return err
}
path := localList[index].Path
r.logger.WithFields(logrus.Fields{
"count": count,
"blen": blen,
"clen": clen,
"remainder": remainder,
"size": localList[index].Size,
}).Info("Downloading: ", string(path))
// If the file is too big to store in memory, creates a temporary file in the directory 'tmp'
buffer := ubuffer.NewBuffer(localList[index].Size, tempDir)
downloadeSize := 0
bufwriter := bufio.NewWriter(buffer)
// Create MD4
//lmd4 := md4.New()
//if err := binary.Write(lmd4, binary.LittleEndian, r.seed); err != nil {
// log.Println("Failed to compute md4")
//}
for {
token, err := r.conn.ReadInt()
if err != nil {
return err
}
r.logger.Debug("TOKEN: ", token)
if token == 0 {
break
} else if token < 0 {
return errors.New("Does not support block checksum")
// Reference
} else {
ctx := make([]byte, token) // FIXME: memory leak?
_, err = io.ReadFull(r.conn, ctx)
if err != nil {
return err
}
downloadeSize += int(token)
r.logger.Debug("Downloaded: ", downloadeSize, " byte")
if _, err := bufwriter.Write(ctx); err != nil {
return err
}
//if _, err := lmd4.Write(ctx); err != nil {
// return err
//}
}
}
if bufwriter.Flush() != nil {
return errors.New("Failed to flush buffer")
}
// Remote MD4
// TODO: compare computed MD4 with remote MD4
_, err = io.ReadFull(r.conn, rmd4)
if err != nil {
return err
}
// Compare two MD4
//if bytes.Compare(rmd4, lmd4.Sum(nil)) != 0 {
// log.Println("Checksum error")
//}
// Put file to object storage
var n int64
n, err = buffer.Seek(0, io.SeekStart)
n, err = r.storage.Put(string(path), buffer, int64(downloadeSize), FileMetadata{
Mtime: localList[index].Mtime,
Mode: localList[index].Mode,
})
if err != nil {
return err
}
if buffer.Finalize() != nil {
return errors.New("Buffer can't be finalized")
}
r.logger.WithFields(logrus.Fields{
"path": string(path),
"size": n,
}).Info("Successfully uploaded")
}
}
// Clean up local files
func (r *Receiver) FileCleaner(localList FileList, deleteList []int) error {
// Since file list was already sorted, we can iterate it in the reverse direction to traverse the file tree in post-order
// Thus it always cleans sub-files firstly
for i := len(deleteList) - 1; i >= 0; i-- {
fname := string(localList[deleteList[i]].Path)
err := r.storage.Delete(fname, localList[deleteList[i]].Mode)
r.logger.Info("Deleted: ", fname)
if err != nil {
return err
}
}
return nil
}
func (r *Receiver) FinalPhase() error {
//go func() {
// ioerror, err := r.conn.ReadInt()
// log.Println(ioerror, err)
//}()
err := r.conn.WriteInt(INDEX_END)
if err != nil {
return err
}
return r.conn.WriteInt(INDEX_END)
}
func (r *Receiver) Sync() error {
defer func() {
r.logger.WithFields(logrus.Fields{
"conn close err": r.conn.Close(), // TODO: How to handle errors from Close
}).Warn("Task completed")
}()
lfiles, err := r.storage.List()
if err != nil {
return err
}
//for _, v := range lfiles {
// fmt.Println("Local File:", string(v.Path), v.Mode, v.Mtime)
//}
rfiles, symlinks, err := r.RecvFileList()
if err != nil {
return err
}
r.logger.Info("Remote files count: ", len(rfiles))
ioerr, err := r.conn.ReadInt()
if err != nil {
return nil
}
r.logger.Info("IOERR: ", ioerr)
newfiles, oldfiles := lfiles.Diff(rfiles)
if len(newfiles) == 0 && len(oldfiles) == 0 {
r.logger.Warn("There is nothing to do")
}
if r.logger.Level == logrus.DebugLevel {
fmt.Fprintln(r.logger.Out,"New Files:",newfiles)
fmt.Fprintln(r.logger.Out,"Old Files:",oldfiles)
}
r.logger.Info("newfiles count: ",len(newfiles))
r.logger.Info("oldfiles count: ",len(oldfiles))
if err := r.Generator(rfiles[:], newfiles[:], symlinks); err != nil {
return err
}
if err := r.FileCleaner(lfiles[:], oldfiles[:]); err != nil {
return err
}
if err := r.FinalPhase(); err != nil {
return err
}
return nil
}