peer.py 文件源码

def send_bitfield(self):
        """
        Tell the peer all the pieces you have in a really compact form.
        """
        # the pieces are compacted in sequence in to bits
        field = BitArray(
            map(
                lambda (sha, piece): sha == piece.digest,
                self.torrent.pieces.items()
            )
        )
        self.send_payload(5, field.tobytes())