import typing


class Server:

    def main(self, port):
        # init socket at given port and listen it
        socket = object()
        socket.listen(port, self.handle_request)
        pass


    def handle_request(self, bytes_received):
        str_received = RequestHandler.handle_request(bytes_received)

        need_sync = 'need_sync' in str_received

        if need_sync:
            # asynchronous
            self.perform_sync()


    def perform_sync(self, *args):
        pass


class RequestHandler:

    @staticmethod
    def send_request(ip, port, request_to_send):
        bytes_to_send = Serializer.from_str_to_bytes(request_to_send)
        # send_request_to(ip + ':' + port, bytes_to_send)
        pass

    @staticmethod
    def handle_request(bytes_from_client):
        str_received = Serializer.from_bytes_to_str(bytes_from_client)
        return str_received



class Serializer:
    @staticmethod
    def from_bytes_to_str(bytes) -> str:
        pass

    @staticmethod
    def from_str_to_bytes(str) -> typing.List[bytes]:
        pass