8 // offsetReader is a thread-safe io.ReadCloser to prevent racing
9 // with retrying requests
10 type offsetReader struct {
16 func newOffsetReader(buf io.ReadSeeker, offset int64) *offsetReader {
17 reader := &offsetReader{}
24 // Close will close the instance of the offset reader's access to
25 // the underlying io.ReadSeeker.
26 func (o *offsetReader) Close() error {
33 // Read is a thread-safe read of the underlying io.ReadSeeker
34 func (o *offsetReader) Read(p []byte) (int, error) {
45 // Seek is a thread-safe seeking operation.
46 func (o *offsetReader) Seek(offset int64, whence int) (int64, error) {
50 return o.buf.Seek(offset, whence)
53 // CloseAndCopy will return a new offsetReader with a copy of the old buffer
54 // and close the old buffer.
55 func (o *offsetReader) CloseAndCopy(offset int64) *offsetReader {
57 return newOffsetReader(o.buf, offset)