baseimage-tutorial-framework/lib/tfw/networking/server/tfw_server.py

from tornado.web import Application

from tfw.networking.controller_connector import ControllerConnector
from tfw.networking.serialization import deserialize_all, serialize_all
from tfw.networking.server.zmq_websocket_handler import FSMManagingSocketHandler


class TFWServer:
    def __init__(self, fsm_type):
        self._fsm = fsm_type()
        self.application = Application(
            [(r'/ws', FSMManagingSocketHandler, {'fsm': self.fsm})]
        )
        self.controller_connector = ControllerConnector()
        self.controller_connector.register_callback(self.zmq_callback)

    @property
    def fsm(self):
        return self._fsm

    def zmq_callback(self, stream, msg_parts):
        key, data = deserialize_all(*msg_parts)
        if key == 'test':
            stream.send_multipart(serialize_all(key, 'OK'))
        if key == 'solution_check':
            stream.send_multipart(serialize_all(key, {
                'solved': self.fsm.is_solved(),
                'message': 'solved' if self.fsm.is_solved() else 'not solved'
            }))

    def listen(self, port):
        self.application.listen(port)