streaming

type File interface {
	// Body fetches the content of the file.  If there are any errors, the
	// io.ReadCloser will be nil.  It is the caller's responsibility to close
	// the io.ReadCloser.
	Body(ctx context.Context) (io.ReadCloser, error)
}

type FileStreamer interface {
	io.Closer
	NextFile(ctx context.Context) (File, error)
}