Repository navigation
Expand file tree
/
Copy pathgateway-gcs.go
More file actions
1128 lines (966 loc) · 35 KB
/
Copy pathgateway-gcs.go
File metadata and controls
1128 lines (966 loc) · 35 KB
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
8000
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
/*
* Minio Cloud Storage, (C) 2017, 2018 Minio, Inc.
*
* 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 gcs
import (
"context"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"math"
"os"
"regexp"
"strings"
"time"
"cloud.google.com/go/storage"
humanize "github.com/dustin/go-humanize"
"github.com/minio/cli"
"github.com/minio/minio-go/pkg/policy"
"github.com/minio/minio/pkg/auth"
"github.com/minio/minio/pkg/errors"
"github.com/minio/minio/pkg/hash"
"google.golang.org/api/googleapi"
"google.golang.org/api/iterator"
"google.golang.org/api/option"
minio "github.com/minio/minio/cmd"
)
var (
// Project ID format is not valid.
errGCSInvalidProjectID = fmt.Errorf("GCS project id is either empty or invalid")
// Project ID not found
errGCSProjectIDNotFound = fmt.Errorf("Unknown project id")
// Invalid format.
errGCSFormat = fmt.Errorf("Unknown format")
)
const (
// Path where multipart objects are saved.
// If we change the backend format we will use a different url path like /multipart/v2
// but we will not migrate old data.
gcsMinioMultipartPathV1 = minio.GatewayMinioSysTmp + "multipart/v1"
// Multipart meta file.
gcsMinioMultipartMeta = "gcs.json"
// gcs.json version number
gcsMinioMultipartMetaCurrentVersion = "1"
// token prefixed with GCS returned marker to differentiate
// from user supplied marker.
gcsTokenPrefix = "{minio}"
// Maximum component object count to create a composite object.
// Refer https://cloud.google.com/storage/docs/composite-objects
gcsMaxComponents = 32
// Every 24 hours we scan minio.sys.tmp to delete expired multiparts in minio.sys.tmp
gcsCleanupInterval = time.Hour * 24
// The cleanup routine deletes files older than 2 weeks in minio.sys.tmp
gcsMultipartExpiry = time.Hour * 24 * 14
// Project ID key in credentials.json
gcsProjectIDKey = "project_id"
gcsBackend = "gcs"
)
func init() {
const gcsGatewayTemplate = `NAME:
{{.HelpName}} - {{.Usage}}
USAGE:
{{.HelpName}} {{if .VisibleFlags}}[FLAGS]{{end}} [PROJECTID]
{{if .VisibleFlags}}
FLAGS:
{{range .VisibleFlags}}{{.}}
{{end}}{{end}}
PROJECTID:
GCS project-id should be provided if GOOGLE_APPLICATION_CREDENTIALS environmental variable is not set.
ENVIRONMENT VARIABLES:
ACCESS:
MINIO_ACCESS_KEY: Username or access key of GCS.
MINIO_SECRET_KEY: Password or secret key of GCS.
BROWSER:
MINIO_BROWSER: To disable web browser access, set this value to "off".
UPDATE:
MINIO_UPDATE: To turn off in-place upgrades, set this value to "off".
DOMAIN:
MINIO_DOMAIN: To enable virtual-host-style requests. Set this value to Minio host domain name.
GCS credentials file:
GOOGLE_APPLICATION_CREDENTIALS: Path to credentials.json
EXAMPLES:
1. Start minio gateway server for GCS backend.
$ export GOOGLE_APPLICATION_CREDENTIALS=/path/to/credentials.json
(Instructions to generate credentials : https://developers.google.com/identity/protocols/application-default-credentials)
$ export MINIO_ACCESS_KEY=accesskey
$ export MINIO_SECRET_KEY=secretkey
$ {{.HelpName}} mygcsprojectid
`
minio.RegisterGatewayCommand(cli.Command{
Name: gcsBackend,
Usage: "Google Cloud Storage.",
Action: gcsGatewayMain,
CustomHelpTemplate: gcsGatewayTemplate,
HideHelpCommand: true,
})
}
// Handler for 'minio gateway gcs' command line.
func gcsGatewayMain(ctx *cli.Context) {
projectID := ctx.Args().First()
if projectID == "" && os.Getenv("GOOGLE_APPLICATION_CREDENTIALS") == "" {
minio.ErrorIf(errGCSProjectIDNotFound, "project-id should be provided as argument or GOOGLE_APPLICATION_CREDENTIALS should be set with path to credentials.json")
cli.ShowCommandHelpAndExit(ctx, "gcs", 1)
}
if projectID != "" && !isValidGCSProjectIDFormat(projectID) {
minio.ErrorIf(errGCSInvalidProjectID, "Unable to start GCS gateway with %s", ctx.Args().First())
cli.ShowCommandHelpAndExit(ctx, "gcs", 1)
}
minio.StartGateway(ctx, &GCS{projectID})
}
// GCS implements Azure.
type GCS struct {
projectID string
}
// Name returns the name of gcs ObjectLayer.
func (g *GCS) Name() string {
return gcsBackend
}
// NewGatewayLayer returns gcs ObjectLayer.
func (g *GCS) NewGatewayLayer(creds auth.Credentials) (minio.ObjectLayer, error) {
ctx := context.Background()
var err error
if g.projectID == "" {
// If project ID is not provided on command line, we figure it out
// from the credentials.json file.
g.projectID, err = gcsParseProjectID(os.Getenv("GOOGLE_APPLICATION_CREDENTIALS"))
if err != nil {
return nil, err
}
}
// Initialize a GCS client.
// Send user-agent in this format for Google to obtain usage insights while participating in the
// Google Cloud Technology Partners (https://cloud.google.com/partners/)
client, err := storage.NewClient(ctx, option.WithUserAgent(fmt.Sprintf("Minio/%s (GPN:Minio;)", minio.Version)))
if err != nil {
return nil, err
}
gcs := &gcsGateway{
client: client,
projectID: g.projectID,
ctx: ctx,
}
// Start background process to cleanup old files in minio.sys.tmp
go gcs.CleanupGCSMinioSysTmp()
return gcs, nil
}
// Production - FIXME: GCS is not production ready yet.
func (g *GCS) Production() bool {
return false
}
// Stored in gcs.json - Contents of this file is not used anywhere. It can be
// used for debugging purposes.
type gcsMultipartMetaV1 struct {
Version string `json:"version"` // Version number
Bucket string `json:"bucket"` // Bucket name
Object string `json:"object"` // Object name
}
// Returns name of the multipart meta object.
func gcsMultipartMetaName(uploadID string) string {
return fmt.Sprintf("%s/%s/%s", gcsMinioMultipartPathV1, uploadID, gcsMinioMultipartMeta)
}
// Returns name of the part object.
func gcsMultipartDataName(uploadID string, partNumber int, etag string) string {
return fmt.Sprintf("%s/%s/%05d.%s", gcsMinioMultipartPathV1, uploadID, partNumber, etag)
}
// Convert Minio errors to minio object layer errors.
func gcsToObjectError(err error, params ...string) error {
if err == nil {
return nil
}
e, ok := err.(*errors.Error)
if !ok {
// Code should be fixed if this function is called without doing errors.Trace()
// Else handling different situations in this function makes this function complicated.
minio.ErrorIf(err, "Expected type *Error")
return err
}
err = e.Cause
bucket := ""
object := ""
uploadID := ""
if len(params) >= 1 {
bucket = params[0]
}
if len(params) == 2 {
object = params[1]
}
if len(params) == 3 {
uploadID = params[2]
}
// in some cases just a plain error is being returned
switch err.Error() {
case "storage: bucket doesn't exist":
err = minio.BucketNotFound{
Bucket: bucket,
}
e.Cause = err
return e
case "storage: object doesn't exist":
if uploadID != "" {
err = minio.InvalidUploadID{
UploadID: uploadID,
}
} else {
err = minio.ObjectNotFound{
Bucket: bucket,
Object: object,
}
}
e.Cause = err
return e
}
googleAPIErr, ok := err.(*googleapi.Error)
if !ok {
// We don't interpret non Minio errors. As minio errors will
// have StatusCode to help to convert to object errors.
e.Cause = err
return e
}
if len(googleAPIErr.Errors) == 0 {
e.Cause = err
return e
}
reason := googleAPIErr.Errors[0].Reason
message := googleAPIErr.Errors[0].Message
switch reason {
case "required":
// Anonymous users does not have storage.xyz access to project 123.
fallthrough
case "keyInvalid":
fallthrough
case "forbidden":
err = minio.PrefixAccessDenied{
Bucket: bucket,
Object: object,
}
case "invalid":
err = minio.BucketNameInvalid{
Bucket: bucket,
}
case "notFound":
if object != "" {
err = minio.ObjectNotFound{
Bucket: bucket,
Object: object,
}
break
}
err = minio.BucketNotFound{Bucket: bucket}
case "conflict":
if message == "You already own this bucket. Please select another name." {
err = minio.BucketAlreadyOwnedByYou{Bucket: bucket}
break
}
if message == "Sorry, that name is not available. Please try a different one." {
err = minio.BucketAlreadyExists{Bucket: bucket}
break
}
err = minio.BucketNotEmpty{Bucket: bucket}
default:
err = fmt.Errorf("Unsupported error reason: %s", reason)
}
e.Cause = err
return e
}
// gcsProjectIDRegex defines a valid gcs project id format
var gcsProjectIDRegex = regexp.MustCompile("^[a-z][a-z0-9-]{5,29}$")
// isValidGCSProjectIDFormat - checks if a given project id format is valid or not.
// Project IDs must start with a lowercase letter and can have lowercase ASCII letters,
// digits or hyphens. Project IDs must be between 6 and 30 characters.
// Ref: https://cloud.google.com/resource-manager/reference/rest/v1/projects#Project (projectId section)
func isValidGCSProjectIDFormat(projectID string) bool {
// Checking projectID format
return gcsProjectIDRegex.MatchString(projectID)
}
// gcsGateway - Implements gateway for Minio and GCS compatible object storage servers.
type gcsGateway struct {
minio.GatewayUnsupported
client *storage.Client
projectID string
ctx context.Context
}
// Returns projectID from the GOOGLE_APPLICATION_CREDENTIALS file.
func gcsParseProjectID(credsFile string) (projectID string, err error) {
contents, err := ioutil.ReadFile(credsFile)
if err != nil {
return projectID, err
}
googleCreds := make(map[string]string)
if err = json.Unmarshal(contents, &googleCreds); err != nil {
return projectID, err
}
return googleCreds[gcsProjectIDKey], err
}
// Cleanup old files in minio.sys.tmp of the given bucket.
func (l *gcsGateway) CleanupGCSMinioSysTmpBucket(bucket string) {
it := l.client.Bucket(bucket).Objects(l.ctx, &storage.Query{Prefix: minio.GatewayMinioSysTmp, Versions: false})
for {
attrs, err := it.Next()
if err != nil {
if err != iterator.Done {
minio.ErrorIf(err, "Object listing error on bucket %s during purging of old files in minio.sys.tmp", bucket)
}
return
}
if time.Since(attrs.Updated) > gcsMultipartExpiry {
// Delete files older than 2 weeks.
err := l.client.Bucket(bucket).Object(attrs.Name).Delete(l.ctx)
if err != nil {
minio.ErrorIf(err, "Unable to delete %s/%s during purging of old files in minio.sys.tmp", bucket, attrs.Name)
return
}
}
}
}
// Cleanup old files in minio.sys.tmp of all buckets.
func (l *gcsGateway) CleanupGCSMinioSysTmp() {
for {
it := l.client.Buckets(l.ctx, l.projectID)
for {
attrs, err := it.Next()
if err != nil {
if err != iterator.Done {
minio.ErrorIf(err, "Bucket listing error during purging of old files in minio.sys.tmp")
}
break
}
l.CleanupGCSMinioSysTmpBucket(attrs.Name)
}
// Run the cleanup loop every 1 day.
time.Sleep(gcsCleanupInterval)
}
}
// Shutdown - save any gateway metadata to disk
// if necessary and reload upon next restart.
func (l *gcsGateway) Shutdown(ctx context.Context) error {
return nil
}
// StorageInfo - Not relevant to GCS backend.
func (l *gcsGateway) StorageInfo(ctx context.Context) minio.StorageInfo {
return minio.StorageInfo{}
}
// MakeBucketWithLocation - Create a new container on GCS backend.
func (l *gcsGateway) MakeBucketWithLocation(ctx context.Context, bucket, location string) error {
bkt := l.client.Bucket(bucket)
// we'll default to the us multi-region in case of us-east-1
if location == "us-east-1" {
location = "us"
}
err := bkt.Create(l.ctx, l.projectID, &storage.BucketAttrs{
Location: location,
})
return gcsToObjectError(errors.Trace(err), bucket)
}
// GetBucketInfo - Get bucket metadata..
func (l *gcsGateway) GetBucketInfo(ctx context.Context, bucket string) (minio.BucketInfo, error) {
attrs, err := l.client.Bucket(bucket).Attrs(l.ctx)
if err != nil {
return minio.BucketInfo{}, gcsToObjectError(errors.Trace(err), bucket)
}
return minio.BucketInfo{
Name: attrs.Name,
Created: attrs.Created,
}, nil
}
// ListBuckets lists all buckets under your project-id on GCS.
func (l *gcsGateway) ListBuckets(ctx context.Context) (buckets []minio.BucketInfo, err error) {
it := l.client.Buckets(l.ctx, l.projectID)
// Iterate and capture all the buckets.
for {
attrs, ierr := it.Next()
if ierr == iterator.Done {
break
}
if ierr != nil {
return buckets, gcsToObjectError(errors.Trace(ierr))
}
buckets = append(buckets, minio.BucketInfo{
Name: attrs.Name,
Created: attrs.Created,
})
}
return buckets, nil
}
// DeleteBucket delete a bucket on GCS.
func (l *gcsGateway) DeleteBucket(ctx context.Context, bucket string) error {
itObject := l.client.Bucket(bucket).Objects(l.ctx, &storage.Query{
Delimiter: "/",
Versions: false,
})
// We list the bucket and if we find any objects we return BucketNotEmpty error. If we
// find only "minio.sys.tmp/" then we remove it before deleting the bucket.
gcsMinioPathFound := false
nonGCSMinioPathFound := false
for {
objAttrs, err := itObject.Next()
if err == iterator.Done {
break
}
if err != nil {
return gcsToObjectError(errors.Trace(err))
}
if objAttrs.Prefix == minio.GatewayMinioSysTmp {
gcsMinioPathFound = true
continue
}
nonGCSMinioPathFound = true
break
}
if nonGCSMinioPathFound {
return gcsToObjectError(errors.Trace(minio.BucketNotEmpty{}))
}
if gcsMinioPathFound {
// Remove minio.sys.tmp before deleting the bucket.
itObject = l.client.Bucket(bucket).Objects(l.ctx, &storage.Query{Versions: false, Prefix: minio.GatewayMinioSysTmp})
for {
objAttrs, err := itObject.Next()
if err == iterator.Done {
break
}
if err != nil {
return gcsToObjectError(errors.Trace(err))
}
err = l.client.Bucket(bucket).Object(objAttrs.Name).Delete(l.ctx)
if err != nil {
return gcsToObjectError(errors.Trace(err))
}
}
}
err := l.client.Bucket(bucket).Delete(l.ctx)
return gcsToObjectError(errors.Trace(err), bucket)
}
func toGCSPageToken(name string) string {
length := uint16(len(name))
b := []byte{
0xa,
byte(length & 0xFF),
}
length = length >> 7
if length > 0 {
b = append(b, byte(length&0xFF))
}
b = append(b, []byte(name)...)
return base64.StdEncoding.EncodeToString(b)
}
// Returns true if marker was returned by GCS, i.e prefixed with
// ##minio by minio gcs minio.
func isGCSMarker(marker string) bool {
return strings.HasPrefix(marker, gcsTokenPrefix)
}
// ListObjects - lists all blobs in GCS bucket filtered by prefix
func (l *gcsGateway) ListObjects(ctx context.Context, bucket string, prefix string, marker string, delimiter string, maxKeys int) (minio.ListObjectsInfo, error) {
it := l.client.Bucket(bucket).Objects(l.ctx, &storage.Query{
Delimiter: delimiter,
Prefix: prefix,
Versions: false,
})
isTruncated := false
nextMarker := ""
prefixes := []string{}
// To accommodate S3-compatible applications using
// ListObjectsV1 to use object keys as markers to control the
// listing of objects, we use the following encoding scheme to
// distinguish between GCS continuation tokens and application
// supplied markers.
//
// - NextMarker in ListObjectsV1 response is constructed by
// prefixing "##minio" to the GCS continuation token,
// e.g, "##minioCgRvYmoz"
//
// - Application supplied markers are used as-is to list
// object keys that appear after it in the lexicographical order.
// If application is using GCS continuation token we should
// strip the gcsTokenPrefix we added.
gcsMarker := isGCSMarker(marker)
if gcsMarker {
it.PageInfo().Token = strings.TrimPrefix(marker, gcsTokenPrefix)
}
it.PageInfo().MaxSize = maxKeys
objects := []minio.ObjectInfo{}
for {
if len(objects) >= maxKeys {
// check if there is one next object and
// if that one next object is our hidden
// metadata folder, then just break
// otherwise we've truncated the output
attrs, _ := it.Next()
if attrs != nil && attrs.Prefix == minio.GatewayMinioSysTmp {
break
}
isTruncated = true
break
}
attrs, err := it.Next()
if err == iterator.Done {
break
}
if err != nil {
return minio.ListObjectsInfo{}, gcsToObjectError(errors.Trace(err), bucket, prefix)
}
nextMarker = toGCSPageToken(attrs.Name)
if attrs.Prefix == minio.GatewayMinioSysTmp {
// We don't return our metadata prefix.
continue
}
if !strings.HasPrefix(prefix, minio.GatewayMinioSysTmp) {
// If client lists outside gcsMinioPath then we filter out gcsMinioPath/* entries.
// But if the client lists inside gcsMinioPath then we return the entries in gcsMinioPath/
// which will be helpful to observe the "directory structure" for debugging purposes.
if strings.HasPrefix(attrs.Prefix, minio.GatewayMinioSysTmp) ||
strings.HasPrefix(attrs.Name, minio.GatewayMinioSysTmp) {
continue
}
}
if attrs.Prefix != "" {
prefixes = append(prefixes, attrs.Prefix)
continue
}
if !gcsMarker && attrs.Name <= marker {
// if user supplied a marker don't append
// objects until we reach marker (and skip it).
continue
}
objects = append(objects, minio.ObjectInfo{
Name: attrs.Name,
Bucket: attrs.Bucket,
ModTime: attrs.Updated,
Size: attrs.Size,
ETag: minio.ToS3ETag(fmt.Sprintf("%d", attrs.CRC32C)),
UserDefined: attrs.Metadata,
ContentType: attrs.ContentType,
ContentEncoding: attrs.ContentEncoding,
})
}
return minio.ListObjectsInfo{
IsTruncated: isTruncated,
NextMarker: gcsTokenPrefix + nextMarker,
Prefixes: prefixes,
Objects: objects,
}, nil
}
// ListObjectsV2 - lists all blobs in GCS bucket filtered by prefix
func (l *gcsGateway) ListObjectsV2(ctx context.Context, bucket, prefix, continuationToken, delimiter string, maxKeys int, fetchOwner bool, startAfter string) (minio.ListObjectsV2Info, error) {
it := l.client.Bucket(bucket).Objects(l.ctx, &storage.Query{
Delimiter: delimiter,
Prefix: prefix,
Versions: false,
})
isTruncated := false
it.PageInfo().MaxSize = maxKeys
if continuationToken != "" {
// If client sends continuationToken, set it
it.PageInfo().Token = continuationToken
} else {
// else set the continuationToken to return
continuationToken = it.PageInfo().Token
if continuationToken != "" {
// If GCS SDK sets continuationToken, it means there are more than maxKeys in the current page
// and the response will be truncated
isTruncated = true
}
}
var prefixes []string
var objects []minio.ObjectInfo
for {
attrs, err := it.Next()
if err == iterator.Done {
break
}
if err != nil {
return minio.ListObjectsV2Info{}, gcsToObjectError(errors.Trace(err), bucket, prefix)
}
if attrs.Prefix == minio.GatewayMinioSysTmp {
// We don't return our metadata prefix.
continue
}
if !strings.HasPrefix(prefix, minio.GatewayMinioSysTmp) {
// If client lists outside gcsMinioPath then we filter out gcsMinioPath/* entries.
// But if the client lists inside gcsMinioPath then we return the entries in gcsMinioPath/
// which will be helpful to observe the "directory structure" for debugging purposes.
if strings.HasPrefix(attrs.Prefix, minio.GatewayMinioSysTmp) ||
strings.HasPrefix(attrs.Name, minio.GatewayMinioSysTmp) {
continue
}
}
if attrs.Prefix != "" {
prefixes = append(prefixes, attrs.Prefix)
continue
}
objects = append(objects, fromGCSAttrsToObjectInfo(attrs))
}
return minio.ListObjectsV2Info{
IsTruncated: isTruncated,
ContinuationToken: continuationToken,
NextContinuationToken: continuationToken,
Prefixes: prefixes,
Objects: objects,
}, nil
}
// GetObject - reads an object from GCS. Supports additional
// parameters like offset and length which are synonymous with
// HTTP Range requests.
//
// startOffset indicates the starting read location of the object.
// length indicates the total length of the object.
func (l *gcsGateway) GetObject(ctx context.Context, bucket string, key string, startOffset int64, length int64, writer io.Writer, etag string) error {
// if we want to mimic S3 behavior exactly, we need to verify if bucket exists first,
// otherwise gcs will just return object not exist in case of non-existing bucket
if _, err := l.client.Bucket(bucket).Attrs(l.ctx); err != nil {
return gcsToObjectError(errors.Trace(err), bucket)
}
object := l.client.Bucket(bucket).Object(key)
r, err := object.NewRangeReader(l.ctx, startOffset, length)
if err != nil {
return gcsToObjectError(errors.Trace(err), bucket, key)
}
defer r.Close()
if _, err := io.Copy(writer, r); err != nil {
return gcsToObjectError(errors.Trace(err), bucket, key)
}
return nil
}
// fromGCSAttrsToObjectInfo converts GCS BucketAttrs to gateway ObjectInfo
func fromGCSAttrsToObjectInfo(attrs *storage.ObjectAttrs) minio.ObjectInfo {
// All google cloud storage objects have a CRC32c hash, whereas composite objects may not have a MD5 hash
// Refer https://cloud.google.com/storage/docs/hashes-etags. Use CRC32C for ETag
return minio.ObjectInfo{
Name: attrs.Name,
Bucket: attrs.Bucket,
ModTime: attrs.Updated,
Size: attrs.Size,
ETag: minio.ToS3ETag(fmt.Sprintf("%d", attrs.CRC32C)),
UserDefined: attrs.Metadata,
ContentType: attrs.ContentType,
ContentEncoding: attrs.ContentEncoding,
}
}
// GetObjectInfo - reads object info and replies back ObjectInfo
func (l *gcsGateway) GetObjectInfo(ctx context.Context, bucket string, object string) (minio.ObjectInfo, error) {
// if we want to mimic S3 behavior exactly, we need to verify if bucket exists first,
// otherwise gcs will just return object not exist in case of non-existing bucket
if _, err := l.client.Bucket(bucket).Attrs(l.ctx); err != nil {
return minio.ObjectInfo{}, gcsToObjectError(errors.Trace(err), bucket)
}
attrs, err := l.client.Bucket(bucket).Object(object).Attrs(l.ctx)
if err != nil {
return minio.ObjectInfo{}, gcsToObjectError(errors.Trace(err), bucket, object)
}
return fromGCSAttrsToObjectInfo(attrs), nil
}
// PutObject - Create a new object with the incoming data,
func (l *gcsGateway) PutObject(ctx context.Context, bucket string, key string, data *hash.Reader, metadata map[string]string) (minio.ObjectInfo, error) {
// if we want to mimic S3 behavior exactly, we need to verify if bucket exists first,
// otherwise gcs will just return object not exist in case of non-existing bucket
if _, err := l.client.Bucket(bucket).Attrs(l.ctx); err != nil {
return minio.ObjectInfo{}, gcsToObjectError(errors.Trace(err), bucket)
}
object := l.client.Bucket(bucket).Object(key)
w := object.NewWriter(l.ctx)
w.ContentType = metadata["content-type"]
w.ContentEncoding = metadata["content-encoding"]
w.Metadata = metadata
if _, err := io.Copy(w, data); err != nil {
// Close the object writer upon error.
w.CloseWithError(err)
return minio.ObjectInfo{}, gcsToObjectError(errors.Trace(err), bucket, key)
}
// Close the object writer upon success.
w.Close()
attrs, err := object.Attrs(l.ctx)
if err != nil {
return minio.ObjectInfo{}, gcsToObjectError(errors.Trace(err), bucket, key)
}
return fromGCSAttrsToObjectInfo(attrs), nil
}
// CopyObject - Copies a blob from source container to destination container.
func (l *gcsGateway) CopyObject(ctx context.Context, srcBucket string, srcObject string, destBucket string, destObject string,
srcInfo minio.ObjectInfo) (minio.ObjectInfo, error) {
src := l.client.Bucket(srcBucket).Object(srcObject)
dst := l.client.Bucket(destBucket).Object(destObject)
copier := dst.CopierFrom(src)
copier.ObjectAttrs.Metadata = srcInfo.UserDefined
attrs, err := copier.Run(l.ctx)
if err != nil {
return minio.ObjectInfo{}, gcsToObjectError(errors.Trace(err), destBucket, destObject)
}
return fromGCSAttrsToObjectInfo(attrs), nil
}
// DeleteObject - Deletes a blob in bucket
func (l *gcsGateway) DeleteObject(ctx context.Context, bucket string, object string) error {
err := l.client.Bucket(bucket).Object(object).Delete(l.ctx)
if err != nil {
return gcsToObjectError(errors.Trace(err), bucket, object)
}
return nil
}
// NewMultipartUpload - upload object in multiple parts
func (l *gcsGateway) NewMultipartUpload(ctx context.Context, bucket string, key string, metadata map[string]string) (uploadID string, err error) {
// generate new uploadid
uploadID = minio.MustGetUUID()
// generate name for part zero
meta := gcsMultipartMetaName(uploadID)
w := l.client.Bucket(bucket).Object(meta).NewWriter(l.ctx)
defer w.Close()
w.ContentType = metadata["content-type"]
w.ContentEncoding = metadata["content-encoding"]
w.Metadata = metadata
if err = json.NewEncoder(w).Encode(gcsMultipartMetaV1{
gcsMinioMultipartMetaCurrentVersion,
bucket,
key,
}); err != nil {
return "", gcsToObjectError(errors.Trace(err), bucket, key)
}
return uploadID, nil
}
// ListMultipartUploads - lists all multipart uploads.
func (l *gcsGateway) ListMultipartUploads(ctx context.Context, bucket string, prefix string, keyMarker string, uploadIDMarker string, delimiter string, maxUploads int) (minio.ListMultipartsInfo, error) {
return minio.ListMultipartsInfo{
KeyMarker: keyMarker,
UploadIDMarker: uploadIDMarker,
MaxUploads: maxUploads,
Prefix: prefix,
Delimiter: delimiter,
}, nil
}
// Checks if minio.sys.tmp/multipart/v1/<upload-id>/gcs.json exists, returns
// an object layer compatible error upon any error.
func (l *gcsGateway) checkUploadIDExists(ctx context.Context, bucket string, key string, uploadID string) error {
_, err := l.client.Bucket(bucket).Object(gcsMultipartMetaName(uploadID)).Attrs(l.ctx)
return gcsToObjectError(errors.Trace(err), bucket, key, uploadID)
}
// PutObjectPart puts a part of object in bucket
func (l *gcsGateway) PutObjectPart(ctx context.Context, bucket string, key string, uploadID string, partNumber int, data *hash.Reader) (minio.PartInfo, error) {
if err := l.checkUploadIDExists(ctx, bucket, key, uploadID); err != nil {
return minio.PartInfo{}, err
}
etag := data.MD5HexString()
if etag == "" {
// Generate random ETag.
etag = minio.GenETag()
}
object := l.client.Bucket(bucket).Object(gcsMultipartDataName(uploadID, partNumber, etag))
w := object.NewWriter(l.ctx)
// Disable "chunked" uploading in GCS client. If enabled, it can cause a corner case
// where it tries to upload 0 bytes in the last chunk and get error from server.
w.ChunkSize = 0
if _, err := io.Copy(w, data); err != nil {
// Make sure to close object writer upon error.
w.Close()
return minio.PartInfo{}, gcsToObjectError(errors.Trace(err), bucket, key)
}
// Make sure to close the object writer upon success.
w.Close()
return minio.PartInfo{
PartNumber: partNumber,
ETag: etag,
LastModified: minio.UTCNow(),
Size: data.Size(),
}, nil
}
// ListObjectParts returns all object parts for specified object in specified bucket
func (l *gcsGateway) ListObjectParts(ctx context.Context, bucket string, key string, uploadID string, partNumberMarker int, maxParts int) (minio.ListPartsInfo, error) {
return minio.ListPartsInfo{}, l.checkUploadIDExists(ctx, bucket, key, uploadID)
}
// Called by AbortMultipartUpload and CompleteMultipartUpload for cleaning up.
func (l *gcsGateway) cleanupMultipartUpload(bucket, key, uploadID string) error {
prefix := fmt.Sprintf("%s/%s/", gcsMinioMultipartPathV1, uploadID)
// iterate through all parts and delete them
it := l.client.Bucket(bucket).Objects(l.ctx, &storage.Query{Prefix: prefix, Versions: false})
for {
attrs, err := it.Next()
if err == iterator.Done {
break
}
if err != nil {
return gcsToObjectError(errors.Trace(err), bucket, key)
}
object := l.client.Bucket(bucket).Object(attrs.Name)
// Ignore the error as parallel AbortMultipartUpload might have deleted it.
object.Delete(l.ctx)
}
return nil
}
// AbortMultipartUpload aborts a ongoing multipart upload
func (l *gcsGateway) AbortMultipartUpload(ctx context.Context, bucket string, key string, uploadID string) error {
if err := l.checkUploadIDExists(ctx, bucket, key, uploadID); err != nil {
return err
}
return l.cleanupMultipartUpload(bucket, key, uploadID)
}
// CompleteMultipartUpload completes ongoing multipart upload and finalizes object
// Note that there is a limit (currently 32) to the number of components that can
// be composed in a single operation. There is a limit (currently 1024) to the total
// number of components for a given composite object. This means you can append to
// each object at most 1023 times. There is a per-project rate limit (currently 200)
// to the number of components you can compose per second. This rate counts both the
// components being appended to a composite object as well as the components being
// copied when the composite object of which they are a part is copied.
func (l *gcsGateway) CompleteMultipartUpload(ctx context.Context, bucket string, key string, uploadID string, uploadedParts []minio.CompletePart) (minio.ObjectInfo, error) {
meta := gcsMultipartMetaName(uploadID)
object := l.client.Bucket(bucket).Object(meta)
partZeroAttrs, err := object.Attrs(l.ctx)
if err != nil {
return minio.ObjectInfo{}, gcsToObjectError(errors.Trace(err), bucket, key, uploadID)
}
r, err := object.NewReader(l.ctx)
if err != nil {
return minio.ObjectInfo{}, gcsToObjectError(errors.Trace(err), bucket, key)
}
defer r.Close()
// Check version compatibility of the meta file before compose()
multipartMeta := gcsMultipartMetaV1{}
if err = json.NewDecoder(r).Decode(&multipartMeta); err != nil {
return minio.ObjectInfo{}, gcsToObjectError(errors.Trace(err), bucket, key)
}
if multipartMeta.Version != gcsMinioMultipartMetaCurrentVersion {
return minio.ObjectInfo{}, gcsToObjectError(errors.Trace(errGCSFormat), bucket, key)
}
// Validate if the gcs.json stores valid entries for the bucket and key.
if multipartMeta.Bucket != bucket || multipartMeta.Object != key {
return minio.ObjectInfo{}, gcsToObjectError(minio.InvalidUploadID{
UploadID: uploadID,
}, bucket, key)
}
var parts []*storage.ObjectHandle
partSizes := make([]int64, len(uploadedParts))
for i, uploadedPart := range uploadedParts {
parts = append(parts, l.client.Bucket(bucket).Object(gcsMultipartDataName(uploadID,
uploadedPart.PartNumber, uploadedPart.ETag)))
partAttr, pErr := l.client.Bucket(bucket).Object(gcsMultipartDataName(uploadID, uploadedPart.PartNumber, uploadedPart.ETag)).Attrs(l.ctx)
if pErr != nil {
return minio.ObjectInfo{}, gcsToObjectError(errors.Trace(pErr), bucket, key, uploadID)
}
partSizes[i] = partAttr.Size
}
// Error out if parts except last part sizing < 5MiB.
for i, size := range partSizes[:len(partSizes)-1] {
if size < 5*humanize.MiByte {
return minio.ObjectInfo{}, errors.Trace(minio.PartTooSmall{
PartNumber: uploadedParts[i].PartNumber,
PartSize: size,