b2: Implement server side copy for files > 5GB - fixes #3991
This factors copy out of SetModTime and Copy so it can be called from both places. This also reworks all the multipart uploading to use sync.Errgroup and memory pooling like the other backends. This makes it more memory efficient and handle errors better. See: https://forum.rclone.org/t/copying-files-within-a-b2-bucket/16680/10
This commit is contained in:
Nick Craig-Wood
parent
4c7f7582fd
commit
fb61ed8506
3 changed files with 339 additions and 228 deletions
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@ -21,6 +21,7 @@ import (
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"github.com/rclone/rclone/fs/accounting"
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"github.com/rclone/rclone/fs/hash"
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"github.com/rclone/rclone/lib/rest"
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"golang.org/x/sync/errgroup"
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)
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type hashAppendingReader struct {
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@ -68,20 +69,26 @@ func newHashAppendingReader(in io.Reader, h gohash.Hash) *hashAppendingReader {
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// largeUpload is used to control the upload of large files which need chunking
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type largeUpload struct {
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f *Fs // parent Fs
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o *Object // object being uploaded
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in io.Reader // read the data from here
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wrap accounting.WrapFn // account parts being transferred
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id string // ID of the file being uploaded
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size int64 // total size
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parts int64 // calculated number of parts, if known
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sha1s []string // slice of SHA1s for each part
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uploadMu sync.Mutex // lock for upload variable
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uploads []*api.GetUploadPartURLResponse // result of get upload URL calls
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f *Fs // parent Fs
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o *Object // object being uploaded
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doCopy bool // doing copy rather than upload
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what string // text name of operation for logs
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in io.Reader // read the data from here
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wrap accounting.WrapFn // account parts being transferred
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id string // ID of the file being uploaded
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size int64 // total size
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parts int64 // calculated number of parts, if known
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sha1s []string // slice of SHA1s for each part
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uploadMu sync.Mutex // lock for upload variable
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uploads []*api.GetUploadPartURLResponse // result of get upload URL calls
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chunkSize int64 // chunk size to use
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src *Object // if copying, object we are reading from
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}
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// newLargeUpload starts an upload of object o from in with metadata in src
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func (f *Fs) newLargeUpload(ctx context.Context, o *Object, in io.Reader, src fs.ObjectInfo) (up *largeUpload, err error) {
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//
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// If newInfo is set then metadata from that will be used instead of reading it from src
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func (f *Fs) newLargeUpload(ctx context.Context, o *Object, in io.Reader, src fs.ObjectInfo, chunkSize fs.SizeSuffix, doCopy bool, newInfo *api.File) (up *largeUpload, err error) {
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remote := o.remote
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size := src.Size()
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parts := int64(0)
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@ -89,8 +96,8 @@ func (f *Fs) newLargeUpload(ctx context.Context, o *Object, in io.Reader, src fs
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if size == -1 {
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fs.Debugf(o, "Streaming upload with --b2-chunk-size %s allows uploads of up to %s and will fail only when that limit is reached.", f.opt.ChunkSize, maxParts*f.opt.ChunkSize)
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} else {
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parts = size / int64(o.fs.opt.ChunkSize)
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if size%int64(o.fs.opt.ChunkSize) != 0 {
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parts = size / int64(chunkSize)
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if size%int64(chunkSize) != 0 {
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parts++
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}
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if parts > maxParts {
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@ -99,7 +106,6 @@ func (f *Fs) newLargeUpload(ctx context.Context, o *Object, in io.Reader, src fs
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sha1SliceSize = parts
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}
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modTime := src.ModTime(ctx)
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opts := rest.Opts{
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Method: "POST",
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Path: "/b2_start_large_file",
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@ -110,18 +116,24 @@ func (f *Fs) newLargeUpload(ctx context.Context, o *Object, in io.Reader, src fs
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return nil, err
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}
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var request = api.StartLargeFileRequest{
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BucketID: bucketID,
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Name: f.opt.Enc.FromStandardPath(bucketPath),
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ContentType: fs.MimeType(ctx, src),
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Info: map[string]string{
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timeKey: timeString(modTime),
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},
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BucketID: bucketID,
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Name: f.opt.Enc.FromStandardPath(bucketPath),
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}
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// Set the SHA1 if known
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if !o.fs.opt.DisableCheckSum {
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if calculatedSha1, err := src.Hash(ctx, hash.SHA1); err == nil && calculatedSha1 != "" {
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request.Info[sha1Key] = calculatedSha1
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if newInfo == nil {
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modTime := src.ModTime(ctx)
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request.ContentType = fs.MimeType(ctx, src)
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request.Info = map[string]string{
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timeKey: timeString(modTime),
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}
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// Set the SHA1 if known
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if !o.fs.opt.DisableCheckSum || doCopy {
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if calculatedSha1, err := src.Hash(ctx, hash.SHA1); err == nil && calculatedSha1 != "" {
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request.Info[sha1Key] = calculatedSha1
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}
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}
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} else {
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request.ContentType = newInfo.ContentType
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request.Info = newInfo.Info
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}
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var response api.StartLargeFileResponse
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err = f.pacer.Call(func() (bool, error) {
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@ -131,18 +143,24 @@ func (f *Fs) newLargeUpload(ctx context.Context, o *Object, in io.Reader, src fs
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if err != nil {
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return nil, err
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}
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up = &largeUpload{
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f: f,
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o: o,
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doCopy: doCopy,
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what: "upload",
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id: response.ID,
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size: size,
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parts: parts,
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sha1s: make([]string, sha1SliceSize),
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chunkSize: int64(chunkSize),
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}
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// unwrap the accounting from the input, we use wrap to put it
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// back on after the buffering
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in, wrap := accounting.UnWrap(in)
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up = &largeUpload{
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f: f,
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o: o,
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in: in,
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wrap: wrap,
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id: response.ID,
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size: size,
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parts: parts,
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sha1s: make([]string, sha1SliceSize),
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if doCopy {
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up.what = "copy"
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up.src = src.(*Object)
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} else {
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up.in, up.wrap = accounting.UnWrap(in)
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}
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return up, nil
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}
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@ -256,9 +274,41 @@ func (up *largeUpload) transferChunk(ctx context.Context, part int64, body []byt
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return err
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}
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// Copy a chunk
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func (up *largeUpload) copyChunk(ctx context.Context, part int64, partSize int64) error {
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err := up.f.pacer.Call(func() (bool, error) {
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fs.Debugf(up.o, "Copying chunk %d length %d", part, partSize)
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opts := rest.Opts{
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Method: "POST",
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Path: "/b2_copy_part",
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}
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offset := (part - 1) * up.chunkSize // where we are in the source file
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var request = api.CopyPartRequest{
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SourceID: up.src.id,
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LargeFileID: up.id,
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PartNumber: part,
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Range: fmt.Sprintf("bytes=%d-%d", offset, offset+partSize-1),
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}
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var response api.UploadPartResponse
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resp, err := up.f.srv.CallJSON(ctx, &opts, &request, &response)
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retry, err := up.f.shouldRetry(ctx, resp, err)
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if err != nil {
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fs.Debugf(up.o, "Error copying chunk %d (retry=%v): %v: %#v", part, retry, err, err)
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}
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up.sha1s[part-1] = response.SHA1
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return retry, err
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})
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if err != nil {
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fs.Debugf(up.o, "Error copying chunk %d: %v", part, err)
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} else {
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fs.Debugf(up.o, "Done copying chunk %d", part)
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}
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return err
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}
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// finish closes off the large upload
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func (up *largeUpload) finish(ctx context.Context) error {
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fs.Debugf(up.o, "Finishing large file upload with %d parts", up.parts)
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fs.Debugf(up.o, "Finishing large file %s with %d parts", up.what, up.parts)
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opts := rest.Opts{
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Method: "POST",
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Path: "/b2_finish_large_file",
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@ -295,136 +345,145 @@ func (up *largeUpload) cancel(ctx context.Context) error {
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return err
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}
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func (up *largeUpload) managedTransferChunk(ctx context.Context, wg *sync.WaitGroup, errs chan error, part int64, buf []byte) {
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wg.Add(1)
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go func(part int64, buf []byte) {
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defer wg.Done()
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defer up.f.putUploadBlock(buf)
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err := up.transferChunk(ctx, part, buf)
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if err != nil {
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select {
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case errs <- err:
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default:
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}
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}
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}(part, buf)
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}
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func (up *largeUpload) finishOrCancelOnError(ctx context.Context, err error, errs chan error) error {
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if err == nil {
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select {
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case err = <-errs:
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default:
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}
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// If the error pointer is not nil then cancel the transfer
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func (up *largeUpload) cancelOnError(ctx context.Context, err *error) {
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if *err == nil {
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return
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}
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if err != nil {
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fs.Debugf(up.o, "Cancelling large file upload due to error: %v", err)
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cancelErr := up.cancel(ctx)
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if cancelErr != nil {
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fs.Errorf(up.o, "Failed to cancel large file upload: %v", cancelErr)
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}
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return err
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fs.Debugf(up.o, "Cancelling large file %s due to error: %v", up.what, *err)
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cancelErr := up.cancel(ctx)
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if cancelErr != nil {
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fs.Errorf(up.o, "Failed to cancel large file %s: %v", up.what, cancelErr)
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}
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return up.finish(ctx)
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}
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// Stream uploads the chunks from the input, starting with a required initial
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// chunk. Assumes the file size is unknown and will upload until the input
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// reaches EOF.
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//
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// Note that initialUploadBlock must be returned to f.putBuf()
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func (up *largeUpload) Stream(ctx context.Context, initialUploadBlock []byte) (err error) {
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defer up.cancelOnError(ctx, &err)
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fs.Debugf(up.o, "Starting streaming of large file (id %q)", up.id)
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errs := make(chan error, 1)
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hasMoreParts := true
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var wg sync.WaitGroup
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// Transfer initial chunk
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var (
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g, gCtx = errgroup.WithContext(ctx)
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hasMoreParts = true
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)
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up.size = int64(len(initialUploadBlock))
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up.managedTransferChunk(ctx, &wg, errs, 1, initialUploadBlock)
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g.Go(func() error {
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for part := int64(1); hasMoreParts; part++ {
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// Get a block of memory from the pool and token which limits concurrency.
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var buf []byte
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if part == 1 {
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buf = initialUploadBlock
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} else {
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buf = up.f.getBuf(false)
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}
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outer:
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for part := int64(2); hasMoreParts; part++ {
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// Check any errors
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select {
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case err = <-errs:
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break outer
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default:
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// Fail fast, in case an errgroup managed function returns an error
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// gCtx is cancelled. There is no point in uploading all the other parts.
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if gCtx.Err() != nil {
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up.f.putBuf(buf, false)
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return nil
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}
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// Read the chunk
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var n int
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if part == 1 {
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n = len(buf)
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} else {
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n, err = io.ReadFull(up.in, buf)
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if err == io.ErrUnexpectedEOF {
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fs.Debugf(up.o, "Read less than a full chunk, making this the last one.")
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buf = buf[:n]
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hasMoreParts = false
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} else if err == io.EOF {
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fs.Debugf(up.o, "Could not read any more bytes, previous chunk was the last.")
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up.f.putBuf(buf, false)
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return nil
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} else if err != nil {
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// other kinds of errors indicate failure
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up.f.putBuf(buf, false)
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return err
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}
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}
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// Keep stats up to date
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up.parts = part
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up.size += int64(n)
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if part > maxParts {
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up.f.putBuf(buf, false)
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return errors.Errorf("%q too big (%d bytes so far) makes too many parts %d > %d - increase --b2-chunk-size", up.o, up.size, up.parts, maxParts)
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}
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part := part // for the closure
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g.Go(func() (err error) {
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defer up.f.putBuf(buf, false)
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return up.transferChunk(gCtx, part, buf)
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})
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}
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// Get a block of memory
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buf := up.f.getUploadBlock()
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// Read the chunk
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var n int
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n, err = io.ReadFull(up.in, buf)
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if err == io.ErrUnexpectedEOF {
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fs.Debugf(up.o, "Read less than a full chunk, making this the last one.")
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buf = buf[:n]
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hasMoreParts = false
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err = nil
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} else if err == io.EOF {
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fs.Debugf(up.o, "Could not read any more bytes, previous chunk was the last.")
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up.f.putUploadBlock(buf)
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err = nil
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break outer
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} else if err != nil {
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// other kinds of errors indicate failure
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up.f.putUploadBlock(buf)
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break outer
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}
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// Keep stats up to date
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up.parts = part
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up.size += int64(n)
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if part > maxParts {
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err = errors.Errorf("%q too big (%d bytes so far) makes too many parts %d > %d - increase --b2-chunk-size", up.o, up.size, up.parts, maxParts)
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break outer
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}
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// Transfer the chunk
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up.managedTransferChunk(ctx, &wg, errs, part, buf)
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return nil
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})
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err = g.Wait()
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if err != nil {
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return err
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}
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wg.Wait()
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up.sha1s = up.sha1s[:up.parts]
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return up.finishOrCancelOnError(ctx, err, errs)
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return up.finish(ctx)
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}
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// Upload uploads the chunks from the input
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func (up *largeUpload) Upload(ctx context.Context) error {
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fs.Debugf(up.o, "Starting upload of large file in %d chunks (id %q)", up.parts, up.id)
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remaining := up.size
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errs := make(chan error, 1)
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var wg sync.WaitGroup
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var err error
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outer:
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for part := int64(1); part <= up.parts; part++ {
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// Check any errors
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select {
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case err = <-errs:
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break outer
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default:
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func (up *largeUpload) Upload(ctx context.Context) (err error) {
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defer up.cancelOnError(ctx, &err)
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fs.Debugf(up.o, "Starting %s of large file in %d chunks (id %q)", up.what, up.parts, up.id)
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var (
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g, gCtx = errgroup.WithContext(ctx)
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remaining = up.size
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)
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g.Go(func() error {
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for part := int64(1); part <= up.parts; part++ {
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// Get a block of memory from the pool and token which limits concurrency.
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buf := up.f.getBuf(up.doCopy)
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// Fail fast, in case an errgroup managed function returns an error
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// gCtx is cancelled. There is no point in uploading all the other parts.
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if gCtx.Err() != nil {
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up.f.putBuf(buf, up.doCopy)
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return nil
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}
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reqSize := remaining
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if reqSize >= up.chunkSize {
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reqSize = up.chunkSize
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}
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if !up.doCopy {
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// Read the chunk
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buf = buf[:reqSize]
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_, err = io.ReadFull(up.in, buf)
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if err != nil {
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up.f.putBuf(buf, up.doCopy)
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return err
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}
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}
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part := part // for the closure
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g.Go(func() (err error) {
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defer up.f.putBuf(buf, up.doCopy)
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if !up.doCopy {
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err = up.transferChunk(gCtx, part, buf)
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} else {
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err = up.copyChunk(gCtx, part, reqSize)
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}
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return err
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})
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remaining -= reqSize
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}
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reqSize := remaining
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if reqSize >= int64(up.f.opt.ChunkSize) {
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reqSize = int64(up.f.opt.ChunkSize)
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}
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// Get a block of memory
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buf := up.f.getUploadBlock()[:reqSize]
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// Read the chunk
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_, err = io.ReadFull(up.in, buf)
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if err != nil {
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up.f.putUploadBlock(buf)
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break outer
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}
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// Transfer the chunk
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up.managedTransferChunk(ctx, &wg, errs, part, buf)
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remaining -= reqSize
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return nil
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})
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err = g.Wait()
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if err != nil {
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return err
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}
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wg.Wait()
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return up.finishOrCancelOnError(ctx, err, errs)
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return up.finish(ctx)
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}
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