mirror of
https://github.com/rclone/rclone.git
synced 2024-11-08 01:25:14 +01:00
e43b5ce5e5
This is possible now that we no longer support go1.12 and brings rclone into line with standard practices in the Go world. This also removes errors.New and errors.Errorf from lib/errors and prefers the stdlib errors package over lib/errors.
482 lines
14 KiB
Go
482 lines
14 KiB
Go
// Upload large files for b2
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//
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// Docs - https://www.backblaze.com/b2/docs/large_files.html
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package b2
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import (
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"bytes"
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"context"
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"crypto/sha1"
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"encoding/hex"
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"fmt"
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gohash "hash"
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"io"
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"strings"
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"sync"
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"github.com/rclone/rclone/backend/b2/api"
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"github.com/rclone/rclone/fs"
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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/atexit"
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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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h gohash.Hash
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in io.Reader
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hexSum string
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hexReader io.Reader
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}
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// Read returns bytes all bytes from the original reader, then the hex sum
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// of what was read so far, then EOF.
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func (har *hashAppendingReader) Read(b []byte) (int, error) {
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if har.hexReader == nil {
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n, err := har.in.Read(b)
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if err == io.EOF {
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har.in = nil // allow GC
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err = nil // allow reading hexSum before EOF
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har.hexSum = hex.EncodeToString(har.h.Sum(nil))
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har.hexReader = strings.NewReader(har.hexSum)
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}
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return n, err
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}
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return har.hexReader.Read(b)
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}
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// AdditionalLength returns how many bytes the appended hex sum will take up.
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func (har *hashAppendingReader) AdditionalLength() int {
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return hex.EncodedLen(har.h.Size())
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}
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// HexSum returns the hash sum as hex. It's only available after the original
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// reader has EOF'd. It's an empty string before that.
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func (har *hashAppendingReader) HexSum() string {
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return har.hexSum
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}
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// newHashAppendingReader takes a Reader and a Hash and will append the hex sum
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// after the original reader reaches EOF. The increased size depends on the
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// given hash, which may be queried through AdditionalLength()
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func newHashAppendingReader(in io.Reader, h gohash.Hash) *hashAppendingReader {
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withHash := io.TeeReader(in, h)
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return &hashAppendingReader{h: h, in: withHash}
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}
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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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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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//
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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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sha1SliceSize := int64(maxParts)
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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(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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return nil, fmt.Errorf("%q too big (%d bytes) makes too many parts %d > %d - increase --b2-chunk-size", remote, size, parts, maxParts)
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}
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sha1SliceSize = parts
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}
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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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}
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bucket, bucketPath := o.split()
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bucketID, err := f.getBucketID(ctx, bucket)
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if err != nil {
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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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}
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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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resp, err := f.srv.CallJSON(ctx, &opts, &request, &response)
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return f.shouldRetry(ctx, resp, err)
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})
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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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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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// getUploadURL returns the upload info with the UploadURL and the AuthorizationToken
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//
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// This should be returned with returnUploadURL when finished
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func (up *largeUpload) getUploadURL(ctx context.Context) (upload *api.GetUploadPartURLResponse, err error) {
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up.uploadMu.Lock()
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defer up.uploadMu.Unlock()
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if len(up.uploads) == 0 {
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opts := rest.Opts{
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Method: "POST",
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Path: "/b2_get_upload_part_url",
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}
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var request = api.GetUploadPartURLRequest{
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ID: up.id,
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}
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err := up.f.pacer.Call(func() (bool, error) {
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resp, err := up.f.srv.CallJSON(ctx, &opts, &request, &upload)
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return up.f.shouldRetry(ctx, resp, err)
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})
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if err != nil {
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return nil, fmt.Errorf("failed to get upload URL: %w", err)
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}
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} else {
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upload, up.uploads = up.uploads[0], up.uploads[1:]
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}
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return upload, nil
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}
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// returnUploadURL returns the UploadURL to the cache
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func (up *largeUpload) returnUploadURL(upload *api.GetUploadPartURLResponse) {
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if upload == nil {
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return
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}
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up.uploadMu.Lock()
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up.uploads = append(up.uploads, upload)
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up.uploadMu.Unlock()
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}
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// Transfer a chunk
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func (up *largeUpload) transferChunk(ctx context.Context, part int64, body []byte) error {
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err := up.f.pacer.Call(func() (bool, error) {
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fs.Debugf(up.o, "Sending chunk %d length %d", part, len(body))
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// Get upload URL
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upload, err := up.getUploadURL(ctx)
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if err != nil {
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return false, err
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}
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in := newHashAppendingReader(bytes.NewReader(body), sha1.New())
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size := int64(len(body)) + int64(in.AdditionalLength())
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// Authorization
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//
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// An upload authorization token, from b2_get_upload_part_url.
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//
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// X-Bz-Part-Number
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//
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// A number from 1 to 10000. The parts uploaded for one file
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// must have contiguous numbers, starting with 1.
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//
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// Content-Length
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//
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// The number of bytes in the file being uploaded. Note that
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// this header is required; you cannot leave it out and just
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// use chunked encoding. The minimum size of every part but
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// the last one is 100 MB (100,000,000 bytes)
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//
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// X-Bz-Content-Sha1
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//
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// The SHA1 checksum of the this part of the file. B2 will
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// check this when the part is uploaded, to make sure that the
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// data arrived correctly. The same SHA1 checksum must be
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// passed to b2_finish_large_file.
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opts := rest.Opts{
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Method: "POST",
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RootURL: upload.UploadURL,
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Body: up.wrap(in),
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ExtraHeaders: map[string]string{
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"Authorization": upload.AuthorizationToken,
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"X-Bz-Part-Number": fmt.Sprintf("%d", part),
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sha1Header: "hex_digits_at_end",
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},
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ContentLength: &size,
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}
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var response api.UploadPartResponse
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resp, err := up.f.srv.CallJSON(ctx, &opts, nil, &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 sending chunk %d (retry=%v): %v: %#v", part, retry, err, err)
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}
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// On retryable error clear PartUploadURL
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if retry {
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fs.Debugf(up.o, "Clearing part upload URL because of error: %v", err)
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upload = nil
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}
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up.returnUploadURL(upload)
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up.sha1s[part-1] = in.HexSum()
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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 sending chunk %d: %v", part, err)
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} else {
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fs.Debugf(up.o, "Done sending chunk %d", part)
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}
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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 %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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}
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var request = api.FinishLargeFileRequest{
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ID: up.id,
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SHA1s: up.sha1s,
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}
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var response api.FileInfo
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err := up.f.pacer.Call(func() (bool, error) {
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resp, err := up.f.srv.CallJSON(ctx, &opts, &request, &response)
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return up.f.shouldRetry(ctx, resp, err)
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})
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if err != nil {
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return err
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}
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return up.o.decodeMetaDataFileInfo(&response)
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}
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// cancel aborts the large upload
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func (up *largeUpload) cancel(ctx context.Context) error {
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fs.Debugf(up.o, "Cancelling large file %s", up.what)
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opts := rest.Opts{
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Method: "POST",
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Path: "/b2_cancel_large_file",
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}
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var request = api.CancelLargeFileRequest{
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ID: up.id,
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}
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var response api.CancelLargeFileResponse
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err := up.f.pacer.Call(func() (bool, error) {
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resp, err := up.f.srv.CallJSON(ctx, &opts, &request, &response)
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return up.f.shouldRetry(ctx, resp, err)
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})
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if err != nil {
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fs.Errorf(up.o, "Failed to cancel large file %s: %v", up.what, err)
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}
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return err
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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 atexit.OnError(&err, func() { _ = up.cancel(ctx) })()
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fs.Debugf(up.o, "Starting streaming of large file (id %q)", up.id)
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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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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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// 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 fmt.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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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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up.sha1s = up.sha1s[:up.parts]
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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) (err error) {
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defer atexit.OnError(&err, func() { _ = up.cancel(ctx) })()
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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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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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return up.finish(ctx)
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}
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