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https://github.com/avatao-content/baseimage-tutorial-framework
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63 lines
2.3 KiB
Python
63 lines
2.3 KiB
Python
import json
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from tornado.websocket import WebSocketHandler
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from .serialization import deserialize_all
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from ..util import parse_anchor_from_message
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from .event_handler_connector import EventHandlerConnector
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from ..config.logs import logging
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log = logging.getLogger(__name__)
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class ZMQWebSocketHandler(WebSocketHandler):
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_event_handler_connector = EventHandlerConnector() #----.
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# TODO: investigate thread safety! <-----------------'
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# ZMQ sockets shared between several WebSocketHandler instances
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# http://pyzmq.readthedocs.io/en/latest/morethanbindings.html#thread-safety
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def __init__(self, application, request, **kwargs):
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super().__init__(application, request, **kwargs)
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def open(self, *args, **kwargs):
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log.debug('WebSocket connection initiated')
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self._event_handler_connector.register_callback(self.zmq_callback)
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def zmq_callback(self, msg_parts):
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anchor, data = deserialize_all(*msg_parts)
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log.debug('Received on pull socket: {}'.format(data))
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self.write_message(data)
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def on_message(self, message):
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log.debug('Received on WebSocket: {}'.format(message))
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self.send_message(*self.make_response(message))
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def make_response(self, message):
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raise NotImplementedError
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def send_message(self, message: str, anchor: str = None):
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self._event_handler_connector.send_message(message, anchor)
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def on_close(self):
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pass
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# much secure, very cors, wow
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def check_origin(self, origin):
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return True
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class FSMManagingSocketHandler(ZMQWebSocketHandler):
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def __init__(self, FSM, application, request, **kwargs):
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super().__init__(application, request, **kwargs)
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self.fsm = FSM()
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self.fsm.subscribe_message_handler(self.handle_fsm_message)
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def handle_fsm_message(self, message):
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self._event_handler_connector.send_message(message)
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def make_response(self, message):
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self.fsm.trigger(parse_anchor_from_message(message), message=message)
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anchor = 'FSMUpdate'
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response = {'anchor': anchor,
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'data': {'current_state': self.fsm.state,
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'valid_transitions':
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[{'trigger': trigger} for trigger in self.fsm.machine.get_triggers()]}}
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return json.dumps(response), anchor
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