func (ds *DiskStorage) blobDirectory(b blob.Ref) string {
d := b.Digest()
if len(d) < 4 {
d = d + "____"
}
return filepath.Join(ds.root, b.HashName(), d[0:2], d[2:4])
}
func (s *Storage) Fetch(br blob.Ref) (rc io.ReadCloser, size uint32, err error) {
if s.cache != nil {
if rc, size, err = s.cache.Fetch(br); err == nil {
return
}
}
r, fi, err := s.cl.DownloadFileByName(s.b.Name, s.dirPrefix+br.String())
if err, ok := err.(*b2.Error); ok && err.Status == 404 {
return nil, 0, os.ErrNotExist
}
if err != nil {
return nil, 0, err
}
if br.HashName() == "sha1" && fi.ContentSHA1 != br.Digest() {
return nil, 0, errors.New("b2: remote ContentSHA1 mismatch")
}
if fi.ContentLength >= 1<<32 {
r.Close()
return nil, 0, errors.New("object larger than a uint32")
}
size = uint32(fi.ContentLength)
if size > constants.MaxBlobSize {
r.Close()
return nil, size, errors.New("object too big")
}
return r, size, nil
}
func (ds *DiskStorage) blobDirectory(partition string, b blob.Ref) string {
d := b.Digest()
if len(d) < 6 {
d = d + "______"
}
return filepath.Join(ds.PartitionRoot(partition), b.HashName(), d[0:3], d[3:6])
}
func (s *Storage) ReceiveBlob(br blob.Ref, source io.Reader) (blob.SizedRef, error) {
var buf bytes.Buffer
size, err := io.Copy(&buf, source)
if err != nil {
return blob.SizedRef{}, err
}
b := bytes.NewReader(buf.Bytes())
fi, err := s.b.Upload(b, s.dirPrefix+br.String(), "")
if err != nil {
return blob.SizedRef{}, err
}
if int64(fi.ContentLength) != size {
return blob.SizedRef{}, fmt.Errorf("b2: expected ContentLength %d, got %d", size, fi.ContentLength)
}
if br.HashName() == "sha1" && fi.ContentSHA1 != br.Digest() {
return blob.SizedRef{}, fmt.Errorf("b2: expected ContentSHA1 %s, got %s", br.Digest(), fi.ContentSHA1)
}
if s.cache != nil {
// NoHash because it's already verified if we read it without
// errors from the source, and uploaded it without mismatch.
blobserver.ReceiveNoHash(s.cache, br, &buf)
}
return blob.SizedRef{Ref: br, Size: uint32(size)}, nil
}
func blobFileBaseName(b blob.Ref) string {
return fmt.Sprintf("%s-%s.dat", b.HashName(), b.Digest())
}