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import struct

from mod_pywebsocket import common
from mod_pywebsocket import stream


def web_socket_do_extra_handshake(request):
    pass


def web_socket_transfer_data(request):
    while True:
        line = request.ws_stream.receive_message()
        if line is None:
            return
        code, reason = line.split(' ', 1)
        if code is None or reason is None:
            return
        request.ws_stream.close_connection(int(code), reason)
        # close_connection() initiates closing handshake. It validates code
        # and reason. If you want to send a broken close frame for a test,
        # following code will be useful.
        # > data = struct.pack('!H', int(code)) + reason.encode('UTF-8')
        # > request.connection.write(stream.create_close_frame(data))
        # > # Suppress to re-respond client responding close frame.
        # > raise Exception("customized server initiated closing handshake")


def web_socket_passive_closing_handshake(request):
    # Simply echo a close status code
    code, reason = request.ws_close_code, request.ws_close_reason

    # pywebsocket sets pseudo code for receiving an empty body close frame.
    if code == common.STATUS_NO_STATUS_RECEIVED:
        code = None
        reason = ''
    return code, reason


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