mirror of
https://github.com/avatao-content/baseimage-tutorial-framework
synced 2024-09-16 23:44:10 +00:00
96 lines
3.1 KiB
Python
96 lines
3.1 KiB
Python
# Copyright (C) 2018 Avatao.com Innovative Learning Kft.
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# All Rights Reserved. See LICENSE file for details.
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from abc import ABC, abstractmethod
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from tornado.web import Application
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from tfw.networking.event_handlers import ServerUplinkConnector
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from tfw.networking.server import EventHandlerConnector
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from tfw.networking import MessageSender
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from tfw.config.logs import logging
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from .zmq_websocket_proxy import ZMQWebSocketProxy
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LOG = logging.getLogger(__name__)
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class TFWServer:
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"""
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This class handles the proxying of messages between the frontend and event handers.
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It proxies messages from the "/ws" route to all event handlers subscribed to a ZMQ
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SUB socket.
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"""
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def __init__(self):
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self._event_handler_connector = EventHandlerConnector()
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self._uplink_connector = ServerUplinkConnector()
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self.application = Application([(
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r'/ws', ZMQWebSocketProxy, {
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'event_handler_connector': self._event_handler_connector,
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'message_handlers': [self.handle_trigger, self.handle_recover],
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'frontend_message_handlers': [self.save_frontend_messages]
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})])
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self._frontend_messages = FrontendMessageStorage()
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def handle_trigger(self, message):
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if 'trigger' in message:
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LOG.debug('Executing handler for trigger "%s"', message.get('trigger', ''))
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self._uplink_connector.send_to_eventhandler({
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'key': 'fsm',
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'data': {
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'command': 'trigger',
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'value': message.get('trigger', '')
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}
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})
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def handle_recover(self, message):
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if message['key'] == 'recover':
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self._frontend_messages.replay_messages(self._uplink_connector)
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self._frontend_messages.clear()
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def save_frontend_messages(self, message):
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self._frontend_messages.save_message(message)
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def listen(self, port):
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self.application.listen(port)
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class MessageStorage(ABC):
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def __init__(self):
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self.saved_messages = []
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def save_message(self, message):
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if self.filter_message(message):
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self.saved_messages.extend(self.transform_message(message))
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@abstractmethod
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def filter_message(self, message):
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raise NotImplementedError
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def transform_message(self, message): # pylint: disable=no-self-use
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yield message
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def clear(self):
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self.saved_messages.clear()
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class FrontendMessageStorage(MessageStorage):
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def filter_message(self, message):
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key = message['key']
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command = message.get('data', {}).get('command')
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return (
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key in ('message', 'dashboard', 'queueMessages')
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or key == 'ide' and command in ('select', 'read')
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)
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def transform_message(self, message):
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if message['key'] == 'queueMessages':
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yield from MessageSender.generate_messages_from_queue(message)
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else:
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yield message
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def replay_messages(self, connector):
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for message in self.saved_messages:
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connector.send(message)
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