mirror of
https://github.com/avatao-content/baseimage-tutorial-framework
synced 2024-09-16 23:44:10 +00:00
139 lines
4.5 KiB
Python
139 lines
4.5 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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import json
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from tornado.websocket import WebSocketHandler
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from tfw.mixins import CallbackMixin
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from tfw.config.logs import logging
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LOG = logging.getLogger(__name__)
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class ZMQWebSocketProxy(WebSocketHandler):
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# pylint: disable=abstract-method
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instances = set()
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def initialize(self, **kwargs): # pylint: disable=arguments-differ
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self._event_handler_connector = kwargs['event_handler_connector']
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self._message_handlers = kwargs.get('message_handlers', [])
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self._frontend_message_handlers = kwargs.get('frontend_message_handlers', [])
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self._eventhandler_message_handlers = kwargs.get('eventhandler_message_handlers', [])
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self._proxy_filters = kwargs.get('proxy_filters', [])
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self.proxy_eventhandler_to_websocket = TFWProxy(
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self.send_eventhandler_message,
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self.send_websocket_message
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)
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self.proxy_websocket_to_eventhandler = TFWProxy(
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self.send_websocket_message,
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self.send_eventhandler_message
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)
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self.subscribe_proxy_callbacks()
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def subscribe_proxy_callbacks(self):
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self.proxy_websocket_to_eventhandler.subscribe_proxy_callbacks_and_filters(
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self._eventhandler_message_handlers + self._message_handlers,
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self._proxy_filters
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)
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self.proxy_eventhandler_to_websocket.subscribe_proxy_callbacks_and_filters(
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self._frontend_message_handlers + self._message_handlers,
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self._proxy_filters
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)
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def prepare(self):
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ZMQWebSocketProxy.instances.add(self)
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def on_close(self):
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ZMQWebSocketProxy.instances.remove(self)
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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.eventhander_callback)
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def eventhander_callback(self, message):
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"""
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Invoked on ZMQ messages from event handlers.
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"""
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LOG.debug('Received on pull socket: %s', message)
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self.proxy_eventhandler_to_websocket(message)
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def on_message(self, message):
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"""
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Invoked on WS messages from frontend.
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"""
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message = json.loads(message)
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LOG.debug('Received on WebSocket: %s', message)
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self.proxy_websocket_to_eventhandler(message)
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def send_eventhandler_message(self, message):
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self._event_handler_connector.send_message(message)
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@staticmethod
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def send_websocket_message(message):
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for instance in ZMQWebSocketProxy.instances:
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instance.write_message(message)
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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 TFWProxy:
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# pylint: disable=protected-access
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def __init__(self, to_source, to_destination):
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self.to_source = to_source
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self.to_destination = to_destination
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self.proxy_filters = CallbackMixin()
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self.proxy_callbacks = CallbackMixin()
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self.proxy_filters.subscribe_callback(self.validate_message)
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self.keyhandlers = {
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'mirror': self.mirror,
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'broadcast': self.broadcast
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}
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@staticmethod
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def validate_message(message):
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if 'key' not in message:
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raise ValueError('Invalid TFW message format!')
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def __call__(self, message):
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try:
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self.proxy_filters._execute_callbacks(message)
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except ValueError:
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LOG.exception('Invalid TFW message received!')
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return
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self.proxy_callbacks._execute_callbacks(message)
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if message['key'] not in self.keyhandlers:
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self.to_destination(message)
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else:
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handler = self.keyhandlers[message['key']]
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try:
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handler(message)
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except KeyError:
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LOG.error('Invalid "%s" message format! Ignoring.', handler.__name__)
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def mirror(self, message):
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message = message['data']
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LOG.debug('Mirroring message: %s', message)
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self.to_source(message)
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def broadcast(self, message):
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message = message['data']
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LOG.debug('Broadcasting message: %s', message)
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self.to_source(message)
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self.to_destination(message)
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def subscribe_proxy_callbacks_and_filters(self, proxy_callbacks, proxy_filters):
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self.proxy_callbacks.subscribe_callbacks(*proxy_callbacks)
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self.proxy_filters.subscribe_callbacks(*proxy_filters)
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