92 lines
2.1 KiB
Go
92 lines
2.1 KiB
Go
package tools
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import (
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"crypto/sha256"
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"encoding/hex"
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"hash"
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"io"
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"github.com/git-lfs/git-lfs/errors"
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"github.com/git-lfs/git-lfs/progress"
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)
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// CopyWithCallback copies reader to writer while performing a progress callback
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func CopyWithCallback(writer io.Writer, reader io.Reader, totalSize int64, cb progress.CopyCallback) (int64, error) {
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if success, _ := CloneFile(writer, reader); success {
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if cb != nil {
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cb(totalSize, totalSize, 0)
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}
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return totalSize, nil
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}
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if cb == nil {
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return io.Copy(writer, reader)
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}
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cbReader := &progress.CallbackReader{
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C: cb,
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TotalSize: totalSize,
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Reader: reader,
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}
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return io.Copy(writer, cbReader)
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}
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// Get a new Hash instance of the type used to hash LFS content
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func NewLfsContentHash() hash.Hash {
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return sha256.New()
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}
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// HashingReader wraps a reader and calculates the hash of the data as it is read
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type HashingReader struct {
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reader io.Reader
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hasher hash.Hash
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}
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func NewHashingReader(r io.Reader) *HashingReader {
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return &HashingReader{r, NewLfsContentHash()}
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}
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func NewHashingReaderPreloadHash(r io.Reader, hash hash.Hash) *HashingReader {
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return &HashingReader{r, hash}
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}
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func (r *HashingReader) Hash() string {
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return hex.EncodeToString(r.hasher.Sum(nil))
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}
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func (r *HashingReader) Read(b []byte) (int, error) {
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w, err := r.reader.Read(b)
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if err == nil || err == io.EOF {
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_, e := r.hasher.Write(b[0:w])
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if e != nil && err == nil {
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return w, e
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}
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}
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return w, err
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}
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// RetriableReader wraps a error response of reader as RetriableError()
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type RetriableReader struct {
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reader io.Reader
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}
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func NewRetriableReader(r io.Reader) io.Reader {
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return &RetriableReader{r}
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}
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func (r *RetriableReader) Read(b []byte) (int, error) {
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n, err := r.reader.Read(b)
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// EOF is a successful response as it is used to signal a graceful end
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// of input c.f. https://git.io/v6riQ
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//
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// Otherwise, if the error is non-nil and already retriable (in the
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// case that the underlying reader `r.reader` is itself a
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// `*RetriableReader`, return the error wholesale:
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if err == nil || err == io.EOF || errors.IsRetriableError(err) {
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return n, err
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}
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return n, errors.NewRetriableError(err)
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}
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