mirror of
https://github.com/blakeblackshear/frigate.git
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118 lines
3.8 KiB
Python
118 lines
3.8 KiB
Python
"""Websocket communicator."""
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import errno
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import json
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import logging
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import threading
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from typing import Callable
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from wsgiref.simple_server import make_server
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from ws4py.server.wsgirefserver import (
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WebSocketWSGIHandler,
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WebSocketWSGIRequestHandler,
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WSGIServer,
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)
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from ws4py.server.wsgiutils import WebSocketWSGIApplication
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from ws4py.websocket import WebSocket as WebSocket_
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from frigate.comms.dispatcher import Communicator
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from frigate.config import FrigateConfig
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logger = logging.getLogger(__name__)
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class WebSocket(WebSocket_):
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def unhandled_error(self, error):
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"""
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Handles the unfriendly socket closures on the server side
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without showing a confusing error message
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"""
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if hasattr(error, "errno") and error.errno == errno.ECONNRESET:
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pass
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else:
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logging.getLogger("ws4py").exception("Failed to receive data")
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class WebSocketClient(Communicator): # type: ignore[misc]
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"""Frigate wrapper for ws client."""
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def __init__(self, config: FrigateConfig) -> None:
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self.config = config
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self.websocket_server = None
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def subscribe(self, receiver: Callable) -> None:
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self._dispatcher = receiver
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self.start()
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def start(self) -> None:
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"""Start the websocket client."""
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class _WebSocketHandler(WebSocket): # type: ignore[misc]
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receiver = self._dispatcher
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def received_message(self, message: WebSocket.received_message) -> None:
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try:
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json_message = json.loads(message.data.decode("utf-8"))
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json_message = {
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"topic": json_message.get("topic"),
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"payload": json_message.get("payload"),
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}
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except Exception:
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logger.warning(
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f"Unable to parse websocket message as valid json: {message.data.decode('utf-8')}"
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)
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return
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logger.debug(
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f"Publishing mqtt message from websockets at {json_message['topic']}."
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)
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self.receiver(
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json_message["topic"],
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json_message["payload"],
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)
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# start a websocket server on 5002
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WebSocketWSGIHandler.http_version = "1.1"
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self.websocket_server = make_server(
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"127.0.0.1",
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5002,
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server_class=WSGIServer,
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handler_class=WebSocketWSGIRequestHandler,
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app=WebSocketWSGIApplication(handler_cls=_WebSocketHandler),
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)
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self.websocket_server.initialize_websockets_manager()
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self.websocket_thread = threading.Thread(
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target=self.websocket_server.serve_forever
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)
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self.websocket_thread.start()
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def publish(self, topic: str, payload: str, _: bool) -> None:
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try:
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ws_message = json.dumps(
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{
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"topic": topic,
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"payload": payload,
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}
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)
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except Exception:
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# if the payload can't be decoded don't relay to clients
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logger.debug(f"payload for {topic} wasn't text. Skipping...")
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return
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if self.websocket_server is None:
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logger.debug("Skipping message, websocket not connected yet")
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return
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try:
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self.websocket_server.manager.broadcast(ws_message)
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except ConnectionResetError:
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pass
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def stop(self) -> None:
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self.websocket_server.manager.close_all()
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self.websocket_server.manager.stop()
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self.websocket_server.manager.join()
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self.websocket_server.shutdown()
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self.websocket_thread.join()
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logger.info("Exiting websocket client...")
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