-
Notifications
You must be signed in to change notification settings - Fork 0
/
s3.go
1040 lines (921 loc) · 28.8 KB
/
s3.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
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
package filesystem
import (
"bytes"
"context"
"errors"
"io"
"io/fs"
"net/http"
"path"
"regexp"
"strings"
"time"
"github.com/minio/minio-go/v7"
"github.com/minio/minio-go/v7/pkg/credentials"
"github.com/sirupsen/logrus"
)
// constants regarding stubs and directories
const (
DirStubFileName = ".dir" // name of stub file to imitate empty folder
DirStubFileContent = "!" // content of stub file to imitate empty folder
TempDir = "tmp"
)
// ErrSkipDir should be returned from WalkDirFunc to skip walking inside directory
var ErrSkipDir = fs.SkipDir
// errors
var (
ErrCantOpenS3Directory = errors.New("can't open S3 directory")
ErrDirectoryNotEmpty = errors.New("directory not empty")
ErrDestinationPathIsNotDirectory = errors.New("destination path is not directory while source is")
ErrCantUseRenameWithStubObject = errors.New("can't use rename with stub object")
ErrRenamingNonExistentDirectory = errors.New("can't rename non-existent directory")
ErrNotADirectory = errors.New("given path is not a directory")
ErrDirectoryNotExists = errors.New("directory not exists")
ErrUnknownFileMode = errors.New("unknown file mode")
ErrFileAlreadyOpened = errors.New("file already opened")
)
// S3 implements FileSystem. The implementation is not concurrent-safe
type S3 struct {
endpoint string
region string
accessKey string
secretKey string
logger logrus.FieldLogger
useSSL bool
bucketName string
minioClient *minio.Client
openedFilesLocalFS *Local
openedFilesList *S3OpenedFilesList
openedFilesTTL time.Duration
openedFilesTempDir string
emulateEmptyDirs bool
listDirectoryEntries bool
}
// NewS3 returns a pointer to a new Local object
func NewS3(ctx context.Context, p S3Params) (s3 *S3, err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
p.applyDefaults()
s3 = &S3{
endpoint: p.Endpoint,
region: p.Region,
accessKey: p.AccessKey,
secretKey: p.SecretKey,
useSSL: p.UseSSL,
bucketName: p.BucketName,
logger: p.Logger,
openedFilesList: NewS3OpenedFilesList(),
openedFilesTTL: p.OpenedFilesTTL,
openedFilesLocalFS: NewLocal().(*Local),
openedFilesTempDir: p.OpenedFilesTempDir,
emulateEmptyDirs: p.EmulateEmptyDirs,
listDirectoryEntries: p.ListDirectoryEntries,
}
if s3.minioClient, err = minio.New(s3.endpoint, &minio.Options{
Creds: credentials.NewStaticV4(s3.accessKey, s3.secretKey, ""),
Secure: s3.useSSL,
Region: s3.region,
}); err != nil {
return
}
var exists bool
if exists, err = s3.minioClient.BucketExists(ctx, s3.bucketName); err != nil {
return
}
if !exists {
err = s3.minioClient.MakeBucket(ctx, s3.bucketName, minio.MakeBucketOptions{
Region: s3.region,
ObjectLocking: false,
})
}
if s3.emulateEmptyDirs {
if err = s3.putStubObject(ctx, ""); err != nil {
return s3, err
}
}
go s3.openedFilesListCleaning()
return
}
// Logger provides access to a logger
func (s *S3) Logger() logrus.FieldLogger { return s.logger }
// SetListDirectoryEntries or unset it, use mainly for tests
func (s *S3) SetListDirectoryEntries(v bool) { s.listDirectoryEntries = v }
// MinioClient provides access to Minio Client, use mainly for tests
func (s *S3) MinioClient() *minio.Client { return s.minioClient }
// OpenedFilesList provides access to opened files list, use mainly for tests
func (s *S3) OpenedFilesList() *S3OpenedFilesList { return s.openedFilesList }
// OpenedFilesListLock locks opened files list associated mutex, use mainly for tests
func (s *S3) OpenedFilesListLock() { s.openedFilesList.Lock() }
// OpenedFilesListUnlock unlocks opened files list associated mutex, use mainly for tests
func (s *S3) OpenedFilesListUnlock() { s.openedFilesList.Unlock() }
func (s *S3) now() time.Time { return time.Now() }
var driveLetterRegexp = regexp.MustCompile(`^[A-Za-z?]:`)
func (s *S3) nameToDir(name string) string {
if !strings.HasSuffix(name, "/") {
name += "/"
}
return name
}
func (s *S3) nameToStub(name string) string {
return s.nameToDir(name) + DirStubFileName
}
func (s *S3) nameIsADirectory(name string) bool {
return s.nameIsADirectoryPath(name) || s.nameIsADirectoryStub(name)
}
func (s *S3) nameIsADirectoryPath(name string) bool { return strings.HasSuffix(name, "/") }
func (s *S3) nameIsADirectoryStub(name string) bool {
return strings.HasSuffix(name, "/"+DirStubFileName)
}
func (s *S3) stubToDir(name string) string {
if !s.nameIsADirectoryStub(name) {
return name
}
return strings.TrimPrefix(s.Dir(name)+"/", ".")
}
func (s *S3) normalizeName(name string) string {
if len(name) == 0 {
name = "/"
}
isDir := s.nameIsADirectoryPath(name)
name = driveLetterRegexp.ReplaceAllString(name, "")
name = path.Clean(name)
name = strings.ReplaceAll(name, `\`, `/`)
if !strings.HasPrefix(name, "/") {
name = "/" + name
}
if isDir && name != "/" {
name += "/"
}
return name
}
func (s *S3) openedFilesListCleaning() {
for range time.NewTicker(s.openedFilesTTL).C {
var s3FilesToClose []*S3OpenedFile
func() {
s.OpenedFilesListLock()
defer s.OpenedFilesListUnlock()
for key, value := range s.openedFilesList.m {
if s.now().Before(value.Added.Add(s.openedFilesTTL)) { // should not be purged yet
continue
}
s3FilesToClose = append(s3FilesToClose, s.openedFilesList.m[key].S3File)
}
}()
for _, s3File := range s3FilesToClose {
s.logger.Infof("openedFilesListCleaning: autoclosing file %q", s3File.localName)
if err := s3File.Close(); err != nil {
s.logger.Errorf("openedFilesListCleaning: failed to s3File.Close(): %v", err)
}
}
}
}
// TempFileName converts file name to a temporary file name
func (s *S3) TempFileName(name string) string {
return s.openedFilesLocalFS.Join(s.openedFilesTempDir, TempDir, strings.ReplaceAll(name, "/", "__"))
}
const (
fileModeOpen = iota
fileModeCreate
fileModeWrite
)
func (s *S3) openFile(ctx context.Context, name string, fileMode int) (f File, err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
if fileMode > fileModeWrite || fileMode < fileModeOpen {
return nil, ErrUnknownFileMode
}
if name = s.normalizeName(name); s.nameIsADirectory(name) {
return nil, ErrCantOpenS3Directory
}
localFileName := s.TempFileName(name)
var s3OpenedFile *S3OpenedFilesListEntry
func() { // checking lock on entry
s.OpenedFilesListLock()
defer s.OpenedFilesListUnlock()
s3OpenedFile, _ = s.openedFilesList.Map()[localFileName]
}()
if s3OpenedFile != nil {
return s3OpenedFile.S3File, ErrFileAlreadyOpened
}
if err = s.openedFilesLocalFS.MakePathAll(ctx, s.openedFilesLocalFS.Dir(localFileName)); err != nil {
return nil, err
}
if s3OpenedFile == nil {
s3OpenedFile = &S3OpenedFilesListEntry{
Added: s.now(),
S3File: &S3OpenedFile{
ctx: ctx,
s3: s,
underlying: nil, // to be written below
localName: localFileName,
objectName: name,
},
}
}
s.openedFilesList.AddAndLockEntry(localFileName, s3OpenedFile)
defer func() {
if err == nil {
return
}
s.openedFilesList.DeleteAndUnlockEntry(localFileName)
if f != nil {
_ = f.Close()
}
}()
if fileMode != fileModeCreate { // fileModeOpen or fileModeWrite, so we create local file from S3 object
var object *minio.Object
if object, err = s.minioClient.GetObject(ctx, s.bucketName, name, minio.GetObjectOptions{}); err != nil {
return nil, err
}
if err = func() error {
localFile, err := s.openedFilesLocalFS.Create(ctx, localFileName)
if err != nil {
return err
}
defer localFile.Close()
_, err = io.Copy(localFile, object)
return err
}(); err != nil {
return nil, err
}
}
switch fileMode {
case fileModeOpen:
f, err = s.openedFilesLocalFS.Open(ctx, localFileName)
case fileModeCreate:
f, err = s.openedFilesLocalFS.Create(ctx, localFileName)
case fileModeWrite:
f, err = s.openedFilesLocalFS.OpenW(ctx, localFileName)
}
s3OpenedFile.S3File.SetUnderlying(f)
return s3OpenedFile.S3File, err
}
// Open file with given name in the client's bucket.
// An object will be downloaded from S3 storage and opened as a local file for reading.
// To remove the actual local file and write out into S3 object
// it should be properly closed by calling Close() on the caller's side.
// Calls to Open, Create, OpenW and S3OpenedFile.Close are concurrent-safe and mutually locking.
func (s *S3) Open(ctx context.Context, name string) (f File, err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
return s.openFile(ctx, name, fileModeOpen)
}
// Create file with given name in the client's bucket.
// A file will be created locally for reading, writing, truncating.
// To remove the actual local file and write out into S3 object
// it should be properly closed by calling Close() on the caller's side.
// Calls to Open, Create, OpenW and S3OpenedFile.Close are concurrent-safe and mutually locking.
func (s *S3) Create(ctx context.Context, name string) (f File, err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
if dir := s.Dir(name); dir != "." && dir != "/" {
if err = s.MakePathAll(ctx, dir); err != nil {
return
}
}
return s.openFile(ctx, name, fileModeCreate)
}
// OpenW opens file in the FileSystem for writing.
// An object will be downloaded from S3 storage and opened as a local file for writing.
// To remove the actual local file and write out into S3 object
// it should be properly closed by calling Close() on the caller's side.
// Calls to Open, Create, OpenW and S3OpenedFile.Close are concurrent-safe and mutually locking.
func (s *S3) OpenW(ctx context.Context, name string) (f File, err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
if dir := s.Dir(name); dir != "." && dir != "/" {
if err = s.MakePathAll(ctx, dir); err != nil {
return
}
}
return s.openFile(ctx, name, fileModeWrite)
}
// ReadFile by it's name from the client's bucket
func (s *S3) ReadFile(ctx context.Context, name string) (b []byte, err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
name = s.normalizeName(name)
var o *minio.Object
if o, err = s.minioClient.GetObject(ctx, s.bucketName, name, minio.GetObjectOptions{}); err != nil {
return
}
return io.ReadAll(o)
}
// WriteFile by it's name to the client's bucket
func (s *S3) WriteFile(ctx context.Context, name string, b []byte) (err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
name = s.normalizeName(name)
if s.emulateEmptyDirs {
if dir := s.Dir(name); dir != "." && dir != "/" {
if err = s.MakePathAll(ctx, dir); err != nil {
return
}
}
}
_, err = s.minioClient.PutObject(ctx, s.bucketName, name, bytes.NewReader(b), int64(len(b)),
minio.PutObjectOptions{ContentType: http.DetectContentType(b)})
return err
}
// WriteFiles by the data given. An archive will be created by the underlying minio client
func (s *S3) WriteFiles(ctx context.Context, f []FileNameData) (err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
snowBallC := make(chan minio.SnowballObject)
for i, el := range f {
f[i].Name = s.normalizeName(el.Name)
if s.emulateEmptyDirs {
// todo may be optimized if many files have to be written in same subdir structure via a tree
if dir := s.Dir(el.Name); dir != "." && dir != "/" {
if err = s.MakePathAll(ctx, dir); err != nil {
return
}
}
}
}
go func() {
for i := range f {
snowBallC <- minio.SnowballObject{
Key: f[i].Name,
Size: int64(len(f[i].Data)),
ModTime: s.now(),
Content: bytes.NewReader(f[i].Data),
}
}
close(snowBallC)
}()
return s.minioClient.PutObjectsSnowball(ctx, s.bucketName, minio.SnowballOptions{Compress: true}, snowBallC)
}
// Reader returns reader by it's name
func (s *S3) Reader(ctx context.Context, name string) (r io.ReadCloser, err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
name = s.normalizeName(name)
return s.minioClient.GetObject(ctx, s.bucketName, name, minio.GetObjectOptions{})
}
// Count returns count of items in a folder. May count in childs also if recursive param set to true.
func (s *S3) Count(ctx context.Context, name string, recursive bool,
countFunc func(oi minio.ObjectInfo, num int64) (proceed bool, e error)) (c int64, err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
name = s.normalizeName(name)
var cancel context.CancelFunc
ctx, cancel = context.WithCancel(ctx)
defer cancel()
for objectInfo := range s.minioClient.ListObjects(ctx, s.bucketName, minio.ListObjectsOptions{
Prefix: strings.TrimPrefix(name, "/"),
Recursive: recursive,
}) {
c++
if countFunc != nil {
proceed, e := countFunc(objectInfo, c)
if !proceed {
break
}
if e != nil {
return c, e
}
}
if objectInfo.Err != nil {
return c, objectInfo.Err
}
}
return c, nil
}
// Exists checks whether an object exists
func (s *S3) Exists(ctx context.Context, name string) (e bool, err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
name = s.normalizeName(name)
if !s.nameIsADirectoryPath(name) { // not a folder
_, err = s.minioClient.StatObject(ctx, s.bucketName, name, minio.StatObjectOptions{})
switch {
case err == nil:
return true, nil
case s.IsNotExist(err):
return false, nil
default:
return false, err
}
}
// if name is a folder path
// we may check for just a stub file. But we do a more thorough check
// for a case if stub file will not exist.
var count int64
count, err = s.Count(ctx, name, true, nil)
return count > 0, err
}
func (s *S3) putStubObject(ctx context.Context, name string) (err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
name = s.nameToStub(name)
_, err = s.minioClient.PutObject(ctx, s.bucketName, name, strings.NewReader(DirStubFileContent),
int64(len(DirStubFileContent)), minio.PutObjectOptions{
DisableMultipart: true,
ContentType: "text/plain",
})
return
}
// MakePathAll does nothing in S3 FileSystem. As a workaround to make sure that we have a precreated folder,
// we create a small file in it.
// refer to: https://github.com/minio/minio/issues/3555, https://github.com/minio/minio/issues/2423
func (s *S3) MakePathAll(ctx context.Context, name string) (err error) {
if !s.emulateEmptyDirs { // if no empty dirs allowed just do nothing
return
}
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
name = s.normalizeName(name)
for ; name != "/"; name = s.Dir(name) {
if err = s.putStubObject(ctx, name); err != nil {
return
}
}
return
}
// Remove object by the given name. Returns no error even if object does not exists
func (s *S3) Remove(ctx context.Context, name string) (err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
name = s.normalizeName(name)
name = s.stubToDir(name) // if stub, convert to dir with trailing '/'
if !s.nameIsADirectoryPath(name) { // means was not a stub but a normal object name
return s.minioClient.RemoveObject(ctx, s.bucketName, name, minio.RemoveObjectOptions{})
}
// if nameIsADirectoryPath
var isEmpty bool
if isEmpty, err = s.IsEmptyPath(ctx, name); err != nil {
return
}
if !isEmpty {
return ErrDirectoryNotEmpty
}
// if nameIsADirectoryPath && isEmpty
if !s.emulateEmptyDirs {
return
}
return s.minioClient.RemoveObject(ctx, s.bucketName, s.nameToStub(name), minio.RemoveObjectOptions{})
}
// RemoveFiles removes multiple objects in batch by the given names.
// Returns no error even if any object does not exists
func (s *S3) RemoveFiles(ctx context.Context, names []string) (failed []string, err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
objectInfoC := make(chan minio.ObjectInfo)
idx := make([]int, 0, len(names))
for i := range names {
names[i] = s.normalizeName(names[i])
names[i] = s.stubToDir(names[i]) // if stub, convert to dir with trailing '/'
if !s.nameIsADirectoryPath(names[i]) || !s.emulateEmptyDirs { // means was not a stub but a normal object name
idx = append(idx, i)
continue
}
// if nameIsADirectoryPath
var isEmpty bool
if isEmpty, err = s.IsEmptyPath(ctx, names[i]); err != nil {
return nil, err
}
if !isEmpty {
return nil, ErrDirectoryNotEmpty
}
// if nameIsADirectoryPath && isEmpty
idx = append(idx, i)
}
go func() {
defer close(objectInfoC)
for _, i := range idx {
objectInfoC <- minio.ObjectInfo{Key: names[i]}
}
}()
objectRemoveErrorC := s.minioClient.RemoveObjects(ctx, s.bucketName, objectInfoC, minio.RemoveObjectsOptions{})
select {
case ore, more := <-objectRemoveErrorC: // if no error, more will be false
if more && ore.Err != nil {
failed = append(failed, ore.ObjectName)
}
}
return failed, nil
}
// RemoveAll objects by the given filepath
func (s *S3) RemoveAll(ctx context.Context, name string) (err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
name = s.normalizeName(name)
ctx1, cancel1 := context.WithCancel(ctx)
defer cancel1()
objectInfoC := s.minioClient.ListObjects(ctx1, s.bucketName, minio.ListObjectsOptions{
Prefix: strings.TrimPrefix(name, "/"),
Recursive: s.nameIsADirectory(name),
})
ctx2, cancel2 := context.WithCancel(ctx)
defer cancel2()
for roeC := range s.minioClient.RemoveObjects(ctx2, s.bucketName, objectInfoC, minio.RemoveObjectsOptions{}) {
if roeC.Err != nil {
return roeC.Err
}
}
return nil
}
// IsNotExist returns whether err is an 'bucket not exists' error or 'object not exists' error
func (s *S3) IsNotExist(err error) bool {
if err == nil {
return false
}
// look https://github.com/minio/minio-go/issues/1082#issuecomment-468215014 for more details
switch minio.ToErrorResponse(err).Code {
case "NoSuchKey", "NoSuchBucket":
return true
default:
return false
}
}
// IsEmptyPath works according to the MakePathAll implementation.
// Returns true only if specified path contains only a dir stub file.
func (s *S3) IsEmptyPath(ctx context.Context, name string) (e bool, err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
name = s.normalizeName(name)
name = s.nameToDir(name)
if s.emulateEmptyDirs {
var exists bool
if exists, err = s.Exists(ctx, name); err != nil {
return false, err
}
if !exists {
return true, nil
}
}
ctx, cancel := context.WithCancel(ctx)
defer cancel()
var i int
for objectInfo := range s.minioClient.ListObjects(ctx, s.bucketName, minio.ListObjectsOptions{
Prefix: strings.TrimPrefix(name, "/"),
Recursive: true,
}) {
if objectInfo.Err != nil {
return false, objectInfo.Err
}
i++
if (i > 1 || !s.nameIsADirectoryStub("/"+objectInfo.Key)) && s.emulateEmptyDirs ||
i > 0 && !s.emulateEmptyDirs {
return false, nil
}
}
return i == 1 && s.emulateEmptyDirs || i == 0 && !s.emulateEmptyDirs, nil
}
// PreparePath works according to the MakePathAll implementation.
func (s *S3) PreparePath(ctx context.Context, name string) (_ string, err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
name = s.normalizeName(name)
if !s.emulateEmptyDirs { // if no empty dirs allowed just do nothing
return name, nil
}
var exists bool
if exists, err = s.Exists(ctx, name); !exists && err == nil {
if err = s.MakePathAll(ctx, name); err != nil {
return "", err
}
}
return name, nil
}
// Rename object
func (s *S3) Rename(ctx context.Context, from string, to string) (err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
if from, to = s.normalizeName(from), s.normalizeName(to); from == to {
return
}
if s.nameIsADirectoryStub(to) || s.nameIsADirectoryStub(from) {
return ErrCantUseRenameWithStubObject
}
if !s.nameIsADirectory(from) { // normal object
if dir := s.Dir(to); dir != "." && dir != "/" {
if err = s.MakePathAll(ctx, dir); err != nil {
return
}
}
if _, err = s.minioClient.CopyObject(ctx,
minio.CopyDestOptions{Bucket: s.bucketName, Object: to},
minio.CopySrcOptions{Bucket: s.bucketName, Object: from}); err != nil {
return
}
return s.minioClient.RemoveObject(ctx, s.bucketName, from, minio.RemoveObjectOptions{})
}
// if s.nameIsADirectory(from)
if !s.nameIsADirectoryPath(to) {
return ErrDestinationPathIsNotDirectory
}
var exists bool
if exists, err = s.Exists(ctx, from); err != nil {
return
}
if !exists {
return ErrRenamingNonExistentDirectory
}
ctx1, cancel1 := context.WithCancel(ctx)
defer cancel1()
for objectInfo := range s.minioClient.ListObjects(ctx1, s.bucketName, minio.ListObjectsOptions{
Prefix: strings.TrimPrefix(from, "/"),
Recursive: true,
}) {
objTo := to + strings.TrimPrefix("/"+objectInfo.Key, from)
if dir := s.Dir(objTo); dir != "." && dir != "/" {
if err = s.MakePathAll(ctx, dir); err != nil {
return
}
}
if _, err = s.minioClient.CopyObject(ctx,
minio.CopyDestOptions{Bucket: s.bucketName, Object: objTo},
minio.CopySrcOptions{Bucket: s.bucketName, Object: objectInfo.Key}); err != nil {
return
}
if err = s.minioClient.RemoveObject(ctx, s.bucketName, objectInfo.Key, minio.RemoveObjectOptions{}); err != nil {
s.logger.Errorf("S3.Rename: failed to remove object %q while batch moving", objectInfo.Key)
return
}
}
return nil
}
// Stat returns S3 object information as FileInfo interface
func (s *S3) Stat(ctx context.Context, name string) (fi FileInfo, err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
name = s.normalizeName(name)
if s.nameIsADirectoryPath(name) && s.emulateEmptyDirs {
var objectInfo minio.ObjectInfo
if objectInfo, err = s.minioClient.StatObject(ctx, s.bucketName, s.nameToStub(name),
minio.StatObjectOptions{}); err != nil {
return
}
// objectInfo.LastModified may be zero struct
return NewS3FileInfoStub(s, name, objectInfo.LastModified), nil
}
// if !s.nameIsADirectory(name) || !s.emulateEmptyDirs
if s.nameIsADirectoryPath(name) {
var c int64
if c, err = s.Count(ctx, name, true, nil); err != nil {
return
}
if c > 0 { // directory virtually exists
// modTime is not available when empty dirs are not emulated
return NewS3FileInfoStub(s, name, time.Time{}), nil
}
return nil, ErrDirectoryNotExists
}
// if (!s.nameIsADirectory(name) || !s.emulateEmptyDirs) && !s.nameIsADirectoryPath(name)
var objectInfo minio.ObjectInfo
if objectInfo, err = s.minioClient.StatObject(ctx, s.bucketName, name, minio.StatObjectOptions{}); err != nil {
return
}
return NewS3FileInfo(s, objectInfo), nil
}
// ReadDir simulates directory reading by the given name
func (s *S3) ReadDir(ctx context.Context, name string) (fi FilesInfo, err error) {
if ctx, err = invokeBeforeOperationCB(ctx); err != nil {
return
}
defer func() {
if errcb := invokeAfterOperationCB(ctx); err == nil {
err = errcb
} // else drop callback error
}()
name = s.normalizeName(name)
if !s.nameIsADirectory(name) {
return nil, ErrNotADirectory
}
name = s.stubToDir(name)
dirMap := make(map[string]struct{})
var cancel context.CancelFunc
ctx, cancel = context.WithCancel(ctx)
defer cancel()
fi = make(FilesInfo, 0)
// reading files
for objectInfo := range s.minioClient.ListObjects(ctx, s.bucketName, minio.ListObjectsOptions{
Prefix: strings.TrimPrefix(name, "/"),
Recursive: false,
}) {
if objectInfo.Err != nil {
return fi, objectInfo.Err
}
if s.nameIsADirectory(objectInfo.Key) {
continue
}
if !strings.HasPrefix(objectInfo.Key, "/") { // add leading '/'
objectInfo.Key = "/" + objectInfo.Key
}
fi = append(fi, NewS3FileInfo(s, objectInfo))
}
if !s.listDirectoryEntries {
return fi, nil
}
// reading dir entries
for objectInfo := range s.minioClient.ListObjects(ctx, s.bucketName, minio.ListObjectsOptions{
Prefix: strings.TrimPrefix(name, "/"),
Recursive: true,
}) {
if objectInfo.Err != nil {
return fi, objectInfo.Err
}
// only current level directories
var key string
parent := func() string { return s.Dir("/"+objectInfo.Key) + "/" }
stillNotRoot := func() bool { return len(strings.TrimRight(key, "/")) > 0 }
upwards := func() string { return s.Dir(strings.TrimSuffix(key, "/")) + "/" }
for key = parent(); stillNotRoot(); key = upwards() {
if strings.HasPrefix(key, name) && strings.Count(strings.TrimPrefix(key, name), "/") <= 1 && key != name {
dirMap[key] = struct{}{}
}
}
}
for dirName := range dirMap { // adding directory entries to the list
s3fi := NewS3FileInfoStub(s, dirName, time.Time{})
if s.emulateEmptyDirs { // may request stat
var o FileInfo
if o, err = s.Stat(ctx, s.nameToStub(dirName)); err != nil {
return fi, err
}
s3fi.oi.LastModified = o.ModTime()
}
fi = append(fi, s3fi)
}
return fi, nil
}
// walkDir recursively descends path, calling walkDirFunc
func (s *S3) walkDir(ctx context.Context, name string, d DirEntry, walkDirFunc WalkDirFunc) (err error) {
name = s.normalizeName(name)
if err = walkDirFunc(name, d, nil); err != nil || !d.IsDir() {
if err == ErrSkipDir && d.IsDir() {
err = nil
}
return // err may be nil if it is not directory
}
var fsi FilesInfo
if fsi, err = s.ReadDir(ctx, name); err != nil {
if err = walkDirFunc(name, d, err); err != nil { // second call, to report an error from s.ReadDir()
return
}
}
for _, fi := range fsi {
if s.nameIsADirectoryStub(fi.FullName()) {
continue
}
if err = s.walkDir(ctx, fi.FullName(), S3DirEntry{oi: fi.(S3FileInfo).oi, fi: fi, s3: fi.Sys().(*S3)},
walkDirFunc); err != nil {
if err == ErrSkipDir {
break
}