162 lines
No EOL
5.1 KiB
Python
162 lines
No EOL
5.1 KiB
Python
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from argparse import Namespace
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import asyncio
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import logging
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from typing import Set, Union, Dict, Any
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from typing_extensions import Self
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from urllib.error import HTTPError
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import tornado.ioloop
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import tornado.web
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import tornado.websocket
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import zmq
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import zmq.asyncio
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logger = logging.getLogger("trajpred.forwarder")
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class WebSocketTrajectoryHandler(tornado.websocket.WebSocketHandler):
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def initialize(self, zmq_socket: zmq.asyncio.Socket):
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self.zmq_socket = zmq_socket
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async def on_message(self, message):
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logger.info(f"recieve: {message}")
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try:
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await self.zmq_socket.send_string(message)
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# msg = json.loads(message)
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except Exception as e:
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# self.send({'alert': 'Invalid request: {}'.format(e)})
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logger.exception(e)
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# self.write_message(u"You said: " + message)
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def open(self, p=None):
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logger.info(f"connected {self.request.remote_ip}")
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# client disconnected
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def on_close(self):
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logger.info(f"Client disconnected: {self.request.remote_ip}")
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class WebSocketPredictionHandler(tornado.websocket.WebSocketHandler):
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connections: Set[Self] = set()
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def initialize(self, config):
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self.config = config
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def on_message(self, message):
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logger.warning(f"Receiving message on send-only ws handler: {message}")
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def open(self, p=None):
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logger.info(f"Prediction WS connected {self.request.remote_ip}")
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self.__class__.connections.add(self)
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# client disconnected
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def on_close(self):
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self.__class__.rmConnection(self)
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logger.info(f"Client disconnected: {self.request.remote_ip}")
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@classmethod
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def rmConnection(cls, client):
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if client not in cls.connections:
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return
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cls.connections.remove(client)
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@classmethod
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def hasConnection(cls, client):
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return client in cls.connections
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@classmethod
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def write_to_clients(cls, msg: Union[bytes, str, Dict[str, Any]]):
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if msg is None:
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logger.critical("Tried to send 'none'")
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return
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toRemove = []
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for client in cls.connections:
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try:
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client.write_message(msg)
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except tornado.websocket.WebSocketClosedError as e:
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logger.warning(f"Not properly closed websocket connection")
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toRemove.append(client) # If we remove it here from the set we get an exception about changing set size during iteration
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for client in toRemove:
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cls.rmConnection(client)
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class DemoHandler(tornado.web.RequestHandler):
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def initialize(self, config: Namespace):
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self.config = config
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def get(self):
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self.render("index.html", ws_port=self.config.ws_port)
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class StaticFileWithHeaderHandler(tornado.web.StaticFileHandler):
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def set_extra_headers(self, path):
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"""For subclass to add extra headers to the response"""
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if path[-5:] == ".html":
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self.set_header("Access-Control-Allow-Origin", "*")
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if path[-4:] == ".svg":
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self.set_header("Content-Type", "image/svg+xml")
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class WsRouter:
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def __init__(self, config: Namespace):
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self.config = config
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context = zmq.asyncio.Context()
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self.trajectory_socket = context.socket(zmq.PUB)
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self.trajectory_socket.bind(config.zmq_prediction_addr if config.bypass_prediction else config.zmq_trajectory_addr)
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self.prediction_socket = context.socket(zmq.SUB)
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self.prediction_socket.connect(config.zmq_prediction_addr)
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self.prediction_socket.setsockopt(zmq.SUBSCRIBE, b'')
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self.application = tornado.web.Application(
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[
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(
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r"/ws/trajectory",
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WebSocketTrajectoryHandler,
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{
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"zmq_socket": self.trajectory_socket
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},
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),
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(
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r"/ws/prediction",
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WebSocketPredictionHandler,
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{
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"config": config,
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},
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),
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(r"/", DemoHandler, {"config": config}),
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# (r"/(.*)", StaticFileWithHeaderHandler, {"config": config, "index": 'index.html'}),
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],
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template_path = 'trajpred/web/',
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compiled_template_cache=False)
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def start(self):
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evt_loop = asyncio.new_event_loop()
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asyncio.set_event_loop(evt_loop)
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# loop = tornado.ioloop.IOLoop.current()
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logger.info(f"Listen on {self.config.ws_port}")
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self.application.listen(self.config.ws_port)
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loop = asyncio.get_event_loop()
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task = evt_loop.create_task(self.prediction_forwarder())
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evt_loop.run_forever()
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async def prediction_forwarder(self):
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logger.info("Starting prediction forwarder")
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while True:
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msg = await self.prediction_socket.recv_string()
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logger.debug(f"Forward prediction message of {len(msg)} chars")
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WebSocketPredictionHandler.write_to_clients(msg)
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def run_ws_forwarder(config: Namespace):
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router = WsRouter(config)
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router.start() |