1 // Copyright (C) The Arvados Authors. All rights reserved.
3 // SPDX-License-Identifier: AGPL-3.0
24 "git.curoverse.com/arvados.git/sdk/go/arvados"
25 "github.com/AdRoll/goamz/aws"
26 "github.com/AdRoll/goamz/s3"
30 s3DefaultReadTimeout = arvados.Duration(10 * time.Minute)
31 s3DefaultConnectTimeout = arvados.Duration(time.Minute)
35 // ErrS3TrashDisabled is returned by Trash if that operation
36 // is impossible with the current config.
37 ErrS3TrashDisabled = fmt.Errorf("trash function is disabled because -trash-lifetime=0 and -s3-unsafe-delete=false")
39 s3AccessKeyFile string
40 s3SecretKeyFile string
45 s3RaceWindow time.Duration
53 maxClockSkew = 600 * time.Second
54 nearlyRFC1123 = "Mon, 2 Jan 2006 15:04:05 GMT"
57 type s3VolumeAdder struct {
61 // String implements flag.Value
62 func (s *s3VolumeAdder) String() string {
66 func (s *s3VolumeAdder) Set(bucketName string) error {
68 return fmt.Errorf("no container name given")
70 if s3AccessKeyFile == "" || s3SecretKeyFile == "" {
71 return fmt.Errorf("-s3-access-key-file and -s3-secret-key-file arguments must given before -s3-bucket-volume")
73 if deprecated.flagSerializeIO {
74 log.Print("Notice: -serialize is not supported by s3-bucket volumes.")
76 s.Config.Volumes = append(s.Config.Volumes, &S3Volume{
78 AccessKeyFile: s3AccessKeyFile,
79 SecretKeyFile: s3SecretKeyFile,
82 RaceWindow: arvados.Duration(s3RaceWindow),
83 S3Replication: s3Replication,
84 UnsafeDelete: s3UnsafeDelete,
85 ReadOnly: deprecated.flagReadonly,
91 func s3regions() (okList []string) {
92 for r := range aws.Regions {
93 okList = append(okList, r)
99 VolumeTypes = append(VolumeTypes, func() VolumeWithExamples { return &S3Volume{} })
101 flag.Var(&s3VolumeAdder{theConfig},
103 "Use the given bucket as a storage volume. Can be given multiple times.")
108 fmt.Sprintf("AWS region used for subsequent -s3-bucket-volume arguments. Allowed values are %+q.", s3regions()))
113 "Endpoint URL used for subsequent -s3-bucket-volume arguments. If blank, use the AWS endpoint corresponding to the -s3-region argument. For Google Storage, use \"https://storage.googleapis.com\".")
116 "s3-access-key-file",
118 "`File` containing the access key used for subsequent -s3-bucket-volume arguments.")
121 "s3-secret-key-file",
123 "`File` containing the secret key used for subsequent -s3-bucket-volume arguments.")
128 "Maximum eventual consistency latency for subsequent -s3-bucket-volume arguments.")
133 "Replication level reported to clients for subsequent -s3-bucket-volume arguments.")
138 "EXPERIMENTAL. Enable deletion (garbage collection) even when trash lifetime is zero, even though there are known race conditions that can cause data loss.")
141 // S3Volume implements Volume using an S3 bucket.
142 type S3Volume struct {
148 LocationConstraint bool
151 ConnectTimeout arvados.Duration
152 ReadTimeout arvados.Duration
153 RaceWindow arvados.Duration
156 StorageClasses []string
163 // Examples implements VolumeWithExamples.
164 func (*S3Volume) Examples() []Volume {
167 AccessKeyFile: "/etc/aws_s3_access_key.txt",
168 SecretKeyFile: "/etc/aws_s3_secret_key.txt",
171 Bucket: "example-bucket-name",
174 RaceWindow: arvados.Duration(24 * time.Hour),
175 ConnectTimeout: arvados.Duration(time.Minute),
176 ReadTimeout: arvados.Duration(5 * time.Minute),
179 AccessKeyFile: "/etc/gce_s3_access_key.txt",
180 SecretKeyFile: "/etc/gce_s3_secret_key.txt",
181 Endpoint: "https://storage.googleapis.com",
183 Bucket: "example-bucket-name",
186 RaceWindow: arvados.Duration(24 * time.Hour),
187 ConnectTimeout: arvados.Duration(time.Minute),
188 ReadTimeout: arvados.Duration(5 * time.Minute),
193 // Type implements Volume.
194 func (*S3Volume) Type() string {
198 // Start populates private fields and verifies the configuration is
200 func (v *S3Volume) Start() error {
201 region, ok := aws.Regions[v.Region]
202 if v.Endpoint == "" {
204 return fmt.Errorf("unrecognized region %+q; try specifying -s3-endpoint instead", v.Region)
207 return fmt.Errorf("refusing to use AWS region name %+q with endpoint %+q; "+
208 "specify empty endpoint (\"-s3-endpoint=\") or use a different region name", v.Region, v.Endpoint)
212 S3Endpoint: v.Endpoint,
213 S3LocationConstraint: v.LocationConstraint,
219 auth.AccessKey, err = readKeyFromFile(v.AccessKeyFile)
223 auth.SecretKey, err = readKeyFromFile(v.SecretKeyFile)
228 // Zero timeouts mean "wait forever", which is a bad
229 // default. Default to long timeouts instead.
230 if v.ConnectTimeout == 0 {
231 v.ConnectTimeout = s3DefaultConnectTimeout
233 if v.ReadTimeout == 0 {
234 v.ReadTimeout = s3DefaultReadTimeout
237 client := s3.New(auth, region)
238 if region.EC2Endpoint.Signer == aws.V4Signature {
239 // Currently affects only eu-central-1
240 client.Signature = aws.V4Signature
242 client.ConnectTimeout = time.Duration(v.ConnectTimeout)
243 client.ReadTimeout = time.Duration(v.ReadTimeout)
244 v.bucket = &s3bucket{
253 // DeviceID returns a globally unique ID for the storage bucket.
254 func (v *S3Volume) DeviceID() string {
255 return "s3://" + v.Endpoint + "/" + v.Bucket
258 func (v *S3Volume) getReaderWithContext(ctx context.Context, loc string) (rdr io.ReadCloser, err error) {
259 ready := make(chan bool)
261 rdr, err = v.getReader(loc)
268 theConfig.debugLogf("s3: abandoning getReader(): %s", ctx.Err())
275 return nil, ctx.Err()
279 // getReader wraps (Bucket)GetReader.
281 // In situations where (Bucket)GetReader would fail because the block
282 // disappeared in a Trash race, getReader calls fixRace to recover the
283 // data, and tries again.
284 func (v *S3Volume) getReader(loc string) (rdr io.ReadCloser, err error) {
285 rdr, err = v.bucket.GetReader(loc)
286 err = v.translateError(err)
287 if err == nil || !os.IsNotExist(err) {
291 _, err = v.bucket.Head("recent/"+loc, nil)
292 err = v.translateError(err)
294 // If we can't read recent/X, there's no point in
295 // trying fixRace. Give up.
303 rdr, err = v.bucket.GetReader(loc)
305 log.Printf("warning: reading %s after successful fixRace: %s", loc, err)
306 err = v.translateError(err)
311 // Get a block: copy the block data into buf, and return the number of
313 func (v *S3Volume) Get(ctx context.Context, loc string, buf []byte) (int, error) {
314 rdr, err := v.getReaderWithContext(ctx, loc)
320 ready := make(chan bool)
325 n, err = io.ReadFull(rdr, buf)
328 case nil, io.EOF, io.ErrUnexpectedEOF:
331 err = v.translateError(err)
336 theConfig.debugLogf("s3: interrupting ReadFull() with Close() because %s", ctx.Err())
338 // Must wait for ReadFull to return, to ensure it
339 // doesn't write to buf after we return.
340 theConfig.debugLogf("s3: waiting for ReadFull() to fail")
348 // Compare the given data with the stored data.
349 func (v *S3Volume) Compare(ctx context.Context, loc string, expect []byte) error {
350 errChan := make(chan error, 1)
352 _, err := v.bucket.Head("recent/"+loc, nil)
359 case err = <-errChan:
362 // Checking for "loc" itself here would interfere with
363 // future GET requests.
365 // On AWS, if X doesn't exist, a HEAD or GET request
366 // for X causes X's non-existence to be cached. Thus,
367 // if we test for X, then create X and return a
368 // signature to our client, the client might still get
369 // 404 from all keepstores when trying to read it.
371 // To avoid this, we avoid doing HEAD X or GET X until
372 // we know X has been written.
374 // Note that X might exist even though recent/X
375 // doesn't: for example, the response to HEAD recent/X
376 // might itself come from a stale cache. In such
377 // cases, we will return a false negative and
378 // PutHandler might needlessly create another replica
379 // on a different volume. That's not ideal, but it's
380 // better than passing the eventually-consistent
381 // problem on to our clients.
382 return v.translateError(err)
384 rdr, err := v.getReaderWithContext(ctx, loc)
389 return v.translateError(compareReaderWithBuf(ctx, rdr, expect, loc[:32]))
392 // Put writes a block.
393 func (v *S3Volume) Put(ctx context.Context, loc string, block []byte) error {
395 return MethodDisabledError
400 md5, err := hex.DecodeString(loc)
404 opts.ContentMD5 = base64.StdEncoding.EncodeToString(md5)
407 // Send the block data through a pipe, so that (if we need to)
408 // we can close the pipe early and abandon our PutReader()
409 // goroutine, without worrying about PutReader() accessing our
410 // block buffer after we release it.
411 bufr, bufw := io.Pipe()
413 io.Copy(bufw, bytes.NewReader(block))
418 ready := make(chan bool)
421 if ctx.Err() != nil {
422 theConfig.debugLogf("%s: abandoned PutReader goroutine finished with err: %s", v, err)
426 err = v.bucket.PutReader(loc, bufr, int64(size), "application/octet-stream", s3ACL, opts)
430 err = v.bucket.PutReader("recent/"+loc, nil, 0, "application/octet-stream", s3ACL, s3.Options{})
434 theConfig.debugLogf("%s: taking PutReader's input away: %s", v, ctx.Err())
435 // Our pipe might be stuck in Write(), waiting for
436 // PutReader() to read. If so, un-stick it. This means
437 // PutReader will get corrupt data, but that's OK: the
438 // size and MD5 won't match, so the write will fail.
439 go io.Copy(ioutil.Discard, bufr)
440 // CloseWithError() will return once pending I/O is done.
441 bufw.CloseWithError(ctx.Err())
442 theConfig.debugLogf("%s: abandoning PutReader goroutine", v)
445 // Unblock pipe in case PutReader did not consume it.
446 io.Copy(ioutil.Discard, bufr)
447 return v.translateError(err)
451 // Touch sets the timestamp for the given locator to the current time.
452 func (v *S3Volume) Touch(loc string) error {
454 return MethodDisabledError
456 _, err := v.bucket.Head(loc, nil)
457 err = v.translateError(err)
458 if os.IsNotExist(err) && v.fixRace(loc) {
459 // The data object got trashed in a race, but fixRace
461 } else if err != nil {
464 err = v.bucket.PutReader("recent/"+loc, nil, 0, "application/octet-stream", s3ACL, s3.Options{})
465 return v.translateError(err)
468 // Mtime returns the stored timestamp for the given locator.
469 func (v *S3Volume) Mtime(loc string) (time.Time, error) {
470 _, err := v.bucket.Head(loc, nil)
472 return zeroTime, v.translateError(err)
474 resp, err := v.bucket.Head("recent/"+loc, nil)
475 err = v.translateError(err)
476 if os.IsNotExist(err) {
477 // The data object X exists, but recent/X is missing.
478 err = v.bucket.PutReader("recent/"+loc, nil, 0, "application/octet-stream", s3ACL, s3.Options{})
480 log.Printf("error: creating %q: %s", "recent/"+loc, err)
481 return zeroTime, v.translateError(err)
483 log.Printf("info: created %q to migrate existing block to new storage scheme", "recent/"+loc)
484 resp, err = v.bucket.Head("recent/"+loc, nil)
486 log.Printf("error: created %q but HEAD failed: %s", "recent/"+loc, err)
487 return zeroTime, v.translateError(err)
489 } else if err != nil {
490 // HEAD recent/X failed for some other reason.
493 return v.lastModified(resp)
496 // IndexTo writes a complete list of locators with the given prefix
497 // for which Get() can retrieve data.
498 func (v *S3Volume) IndexTo(prefix string, writer io.Writer) error {
499 // Use a merge sort to find matching sets of X and recent/X.
501 Bucket: v.bucket.Bucket,
503 PageSize: v.IndexPageSize,
504 Stats: &v.bucket.stats,
507 Bucket: v.bucket.Bucket,
508 Prefix: "recent/" + prefix,
509 PageSize: v.IndexPageSize,
510 Stats: &v.bucket.stats,
512 for data, recent := dataL.First(), recentL.First(); data != nil && dataL.Error() == nil; data = dataL.Next() {
514 // Conveniently, "recent/*" and "trash/*" are
515 // lexically greater than all hex-encoded data
516 // hashes, so stopping here avoids iterating
517 // over all of them needlessly with dataL.
520 if !v.isKeepBlock(data.Key) {
524 // stamp is the list entry we should use to report the
525 // last-modified time for this data block: it will be
526 // the recent/X entry if one exists, otherwise the
527 // entry for the data block itself.
530 // Advance to the corresponding recent/X marker, if any
531 for recent != nil && recentL.Error() == nil {
532 if cmp := strings.Compare(recent.Key[7:], data.Key); cmp < 0 {
533 recent = recentL.Next()
537 recent = recentL.Next()
540 // recent/X marker is missing: we'll
541 // use the timestamp on the data
546 if err := recentL.Error(); err != nil {
549 t, err := time.Parse(time.RFC3339, stamp.LastModified)
553 fmt.Fprintf(writer, "%s+%d %d\n", data.Key, data.Size, t.UnixNano())
558 // Trash a Keep block.
559 func (v *S3Volume) Trash(loc string) error {
561 return MethodDisabledError
563 if t, err := v.Mtime(loc); err != nil {
565 } else if time.Since(t) < theConfig.BlobSignatureTTL.Duration() {
568 if theConfig.TrashLifetime == 0 {
570 return ErrS3TrashDisabled
572 return v.translateError(v.bucket.Del(loc))
574 err := v.checkRaceWindow(loc)
578 err = v.safeCopy("trash/"+loc, loc)
582 return v.translateError(v.bucket.Del(loc))
585 // checkRaceWindow returns a non-nil error if trash/loc is, or might
586 // be, in the race window (i.e., it's not safe to trash loc).
587 func (v *S3Volume) checkRaceWindow(loc string) error {
588 resp, err := v.bucket.Head("trash/"+loc, nil)
589 err = v.translateError(err)
590 if os.IsNotExist(err) {
591 // OK, trash/X doesn't exist so we're not in the race
594 } else if err != nil {
595 // Error looking up trash/X. We don't know whether
596 // we're in the race window
599 t, err := v.lastModified(resp)
601 // Can't parse timestamp
604 safeWindow := t.Add(theConfig.TrashLifetime.Duration()).Sub(time.Now().Add(time.Duration(v.RaceWindow)))
606 // We can't count on "touch trash/X" to prolong
607 // trash/X's lifetime. The new timestamp might not
608 // become visible until now+raceWindow, and EmptyTrash
609 // is allowed to delete trash/X before then.
610 return fmt.Errorf("same block is already in trash, and safe window ended %s ago", -safeWindow)
612 // trash/X exists, but it won't be eligible for deletion until
613 // after now+raceWindow, so it's safe to overwrite it.
617 // safeCopy calls PutCopy, and checks the response to make sure the
618 // copy succeeded and updated the timestamp on the destination object
619 // (PutCopy returns 200 OK if the request was received, even if the
621 func (v *S3Volume) safeCopy(dst, src string) error {
622 resp, err := v.bucket.PutCopy(dst, s3ACL, s3.CopyOptions{
623 ContentType: "application/octet-stream",
624 MetadataDirective: "REPLACE",
625 }, v.bucket.Name+"/"+src)
626 err = v.translateError(err)
627 if os.IsNotExist(err) {
629 } else if err != nil {
630 return fmt.Errorf("PutCopy(%q ← %q): %s", dst, v.bucket.Name+"/"+src, err)
632 if t, err := time.Parse(time.RFC3339Nano, resp.LastModified); err != nil {
633 return fmt.Errorf("PutCopy succeeded but did not return a timestamp: %q: %s", resp.LastModified, err)
634 } else if time.Now().Sub(t) > maxClockSkew {
635 return fmt.Errorf("PutCopy succeeded but returned an old timestamp: %q: %s", resp.LastModified, t)
640 // Get the LastModified header from resp, and parse it as RFC1123 or
641 // -- if it isn't valid RFC1123 -- as Amazon's variant of RFC1123.
642 func (v *S3Volume) lastModified(resp *http.Response) (t time.Time, err error) {
643 s := resp.Header.Get("Last-Modified")
644 t, err = time.Parse(time.RFC1123, s)
645 if err != nil && s != "" {
646 // AWS example is "Sun, 1 Jan 2006 12:00:00 GMT",
647 // which isn't quite "Sun, 01 Jan 2006 12:00:00 GMT"
648 // as required by HTTP spec. If it's not a valid HTTP
649 // header value, it's probably AWS (or s3test) giving
650 // us a nearly-RFC1123 timestamp.
651 t, err = time.Parse(nearlyRFC1123, s)
656 // Untrash moves block from trash back into store
657 func (v *S3Volume) Untrash(loc string) error {
658 err := v.safeCopy(loc, "trash/"+loc)
662 err = v.bucket.PutReader("recent/"+loc, nil, 0, "application/octet-stream", s3ACL, s3.Options{})
663 return v.translateError(err)
666 // Status returns a *VolumeStatus representing the current in-use
667 // storage capacity and a fake available capacity that doesn't make
668 // the volume seem full or nearly-full.
669 func (v *S3Volume) Status() *VolumeStatus {
670 return &VolumeStatus{
672 BytesFree: BlockSize * 1000,
677 // InternalStats returns bucket I/O and API call counters.
678 func (v *S3Volume) InternalStats() interface{} {
679 return &v.bucket.stats
682 // String implements fmt.Stringer.
683 func (v *S3Volume) String() string {
684 return fmt.Sprintf("s3-bucket:%+q", v.Bucket)
687 // Writable returns false if all future Put, Mtime, and Delete calls
688 // are expected to fail.
689 func (v *S3Volume) Writable() bool {
693 // Replication returns the storage redundancy of the underlying
694 // device. Configured via command line flag.
695 func (v *S3Volume) Replication() int {
696 return v.S3Replication
699 // GetStorageClasses implements Volume
700 func (v *S3Volume) GetStorageClasses() []string {
701 return v.StorageClasses
704 var s3KeepBlockRegexp = regexp.MustCompile(`^[0-9a-f]{32}$`)
706 func (v *S3Volume) isKeepBlock(s string) bool {
707 return s3KeepBlockRegexp.MatchString(s)
710 // fixRace(X) is called when "recent/X" exists but "X" doesn't
711 // exist. If the timestamps on "recent/"+loc and "trash/"+loc indicate
712 // there was a race between Put and Trash, fixRace recovers from the
713 // race by Untrashing the block.
714 func (v *S3Volume) fixRace(loc string) bool {
715 trash, err := v.bucket.Head("trash/"+loc, nil)
717 if !os.IsNotExist(v.translateError(err)) {
718 log.Printf("error: fixRace: HEAD %q: %s", "trash/"+loc, err)
722 trashTime, err := v.lastModified(trash)
724 log.Printf("error: fixRace: parse %q: %s", trash.Header.Get("Last-Modified"), err)
728 recent, err := v.bucket.Head("recent/"+loc, nil)
730 log.Printf("error: fixRace: HEAD %q: %s", "recent/"+loc, err)
733 recentTime, err := v.lastModified(recent)
735 log.Printf("error: fixRace: parse %q: %s", recent.Header.Get("Last-Modified"), err)
739 ageWhenTrashed := trashTime.Sub(recentTime)
740 if ageWhenTrashed >= theConfig.BlobSignatureTTL.Duration() {
741 // No evidence of a race: block hasn't been written
742 // since it became eligible for Trash. No fix needed.
746 log.Printf("notice: fixRace: %q: trashed at %s but touched at %s (age when trashed = %s < %s)", loc, trashTime, recentTime, ageWhenTrashed, theConfig.BlobSignatureTTL)
747 log.Printf("notice: fixRace: copying %q to %q to recover from race between Put/Touch and Trash", "recent/"+loc, loc)
748 err = v.safeCopy(loc, "trash/"+loc)
750 log.Printf("error: fixRace: %s", err)
756 func (v *S3Volume) translateError(err error) error {
757 switch err := err.(type) {
759 if (err.StatusCode == http.StatusNotFound && err.Code == "NoSuchKey") ||
760 strings.Contains(err.Error(), "Not Found") {
761 return os.ErrNotExist
763 // Other 404 errors like NoSuchVersion and
764 // NoSuchBucket are different problems which should
765 // get called out downstream, so we don't convert them
766 // to os.ErrNotExist.
771 // EmptyTrash looks for trashed blocks that exceeded TrashLifetime
772 // and deletes them from the volume.
773 func (v *S3Volume) EmptyTrash() {
774 var bytesInTrash, blocksInTrash, bytesDeleted, blocksDeleted int64
776 // Define "ready to delete" as "...when EmptyTrash started".
779 emptyOneKey := func(trash *s3.Key) {
781 if !v.isKeepBlock(loc) {
784 atomic.AddInt64(&bytesInTrash, trash.Size)
785 atomic.AddInt64(&blocksInTrash, 1)
787 trashT, err := time.Parse(time.RFC3339, trash.LastModified)
789 log.Printf("warning: %s: EmptyTrash: %q: parse %q: %s", v, trash.Key, trash.LastModified, err)
792 recent, err := v.bucket.Head("recent/"+loc, nil)
793 if err != nil && os.IsNotExist(v.translateError(err)) {
794 log.Printf("warning: %s: EmptyTrash: found trash marker %q but no %q (%s); calling Untrash", v, trash.Key, "recent/"+loc, err)
797 log.Printf("error: %s: EmptyTrash: Untrash(%q): %s", v, loc, err)
800 } else if err != nil {
801 log.Printf("warning: %s: EmptyTrash: HEAD %q: %s", v, "recent/"+loc, err)
804 recentT, err := v.lastModified(recent)
806 log.Printf("warning: %s: EmptyTrash: %q: parse %q: %s", v, "recent/"+loc, recent.Header.Get("Last-Modified"), err)
809 if trashT.Sub(recentT) < theConfig.BlobSignatureTTL.Duration() {
810 if age := startT.Sub(recentT); age >= theConfig.BlobSignatureTTL.Duration()-time.Duration(v.RaceWindow) {
811 // recent/loc is too old to protect
812 // loc from being Trashed again during
813 // the raceWindow that starts if we
814 // delete trash/X now.
816 // Note this means (TrashCheckInterval
817 // < BlobSignatureTTL - raceWindow) is
818 // necessary to avoid starvation.
819 log.Printf("notice: %s: EmptyTrash: detected old race for %q, calling fixRace + Touch", v, loc)
824 _, err := v.bucket.Head(loc, nil)
825 if os.IsNotExist(err) {
826 log.Printf("notice: %s: EmptyTrash: detected recent race for %q, calling fixRace", v, loc)
829 } else if err != nil {
830 log.Printf("warning: %s: EmptyTrash: HEAD %q: %s", v, loc, err)
834 if startT.Sub(trashT) < theConfig.TrashLifetime.Duration() {
837 err = v.bucket.Del(trash.Key)
839 log.Printf("warning: %s: EmptyTrash: deleting %q: %s", v, trash.Key, err)
842 atomic.AddInt64(&bytesDeleted, trash.Size)
843 atomic.AddInt64(&blocksDeleted, 1)
845 _, err = v.bucket.Head(loc, nil)
847 log.Printf("warning: %s: EmptyTrash: HEAD %q succeeded immediately after deleting %q", v, loc, loc)
850 if !os.IsNotExist(v.translateError(err)) {
851 log.Printf("warning: %s: EmptyTrash: HEAD %q: %s", v, loc, err)
854 err = v.bucket.Del("recent/" + loc)
856 log.Printf("warning: %s: EmptyTrash: deleting %q: %s", v, "recent/"+loc, err)
860 var wg sync.WaitGroup
861 todo := make(chan *s3.Key, theConfig.EmptyTrashWorkers)
862 for i := 0; i < 1 || i < theConfig.EmptyTrashWorkers; i++ {
866 for key := range todo {
873 Bucket: v.bucket.Bucket,
875 PageSize: v.IndexPageSize,
876 Stats: &v.bucket.stats,
878 for trash := trashL.First(); trash != nil; trash = trashL.Next() {
884 if err := trashL.Error(); err != nil {
885 log.Printf("error: %s: EmptyTrash: lister: %s", v, err)
887 log.Printf("EmptyTrash stats for %v: Deleted %v bytes in %v blocks. Remaining in trash: %v bytes in %v blocks.", v.String(), bytesDeleted, blocksDeleted, bytesInTrash-bytesDeleted, blocksInTrash-blocksDeleted)
890 type s3Lister struct {
900 // First fetches the first page and returns the first item. It returns
901 // nil if the response is the empty set or an error occurs.
902 func (lister *s3Lister) First() *s3.Key {
907 // Next returns the next item, fetching the next page if necessary. It
908 // returns nil if the last available item has already been fetched, or
910 func (lister *s3Lister) Next() *s3.Key {
911 if len(lister.buf) == 0 && lister.nextMarker != "" {
917 // Return the most recent error encountered by First or Next.
918 func (lister *s3Lister) Error() error {
922 func (lister *s3Lister) getPage() {
923 lister.Stats.Tick(&lister.Stats.Ops, &lister.Stats.ListOps)
924 resp, err := lister.Bucket.List(lister.Prefix, "", lister.nextMarker, lister.PageSize)
925 lister.nextMarker = ""
930 if resp.IsTruncated {
931 lister.nextMarker = resp.NextMarker
933 lister.buf = make([]s3.Key, 0, len(resp.Contents))
934 for _, key := range resp.Contents {
935 if !strings.HasPrefix(key.Key, lister.Prefix) {
936 log.Printf("warning: s3Lister: S3 Bucket.List(prefix=%q) returned key %q", lister.Prefix, key.Key)
939 lister.buf = append(lister.buf, key)
943 func (lister *s3Lister) pop() (k *s3.Key) {
944 if len(lister.buf) > 0 {
946 lister.buf = lister.buf[1:]
951 // s3bucket wraps s3.bucket and counts I/O and API usage stats.
952 type s3bucket struct {
957 func (b *s3bucket) GetReader(path string) (io.ReadCloser, error) {
958 rdr, err := b.Bucket.GetReader(path)
959 b.stats.Tick(&b.stats.Ops, &b.stats.GetOps)
961 return NewCountingReader(rdr, b.stats.TickInBytes), err
964 func (b *s3bucket) Head(path string, headers map[string][]string) (*http.Response, error) {
965 resp, err := b.Bucket.Head(path, headers)
966 b.stats.Tick(&b.stats.Ops, &b.stats.HeadOps)
971 func (b *s3bucket) PutReader(path string, r io.Reader, length int64, contType string, perm s3.ACL, options s3.Options) error {
973 // goamz will only send Content-Length: 0 when reader
974 // is nil due to net.http.Request.ContentLength
975 // behavior. Otherwise, Content-Length header is
976 // omitted which will cause some S3 services
977 // (including AWS and Ceph RadosGW) to fail to create
981 r = NewCountingReader(r, b.stats.TickOutBytes)
983 err := b.Bucket.PutReader(path, r, length, contType, perm, options)
984 b.stats.Tick(&b.stats.Ops, &b.stats.PutOps)
989 func (b *s3bucket) Del(path string) error {
990 err := b.Bucket.Del(path)
991 b.stats.Tick(&b.stats.Ops, &b.stats.DelOps)
996 type s3bucketStats struct {
1006 func (s *s3bucketStats) TickErr(err error) {
1010 errType := fmt.Sprintf("%T", err)
1011 if err, ok := err.(*s3.Error); ok {
1012 errType = errType + fmt.Sprintf(" %d %s", err.StatusCode, err.Code)
1014 s.statsTicker.TickErr(err, errType)