251 lines
8.0 KiB
Python
251 lines
8.0 KiB
Python
"""View to accept incoming websocket connection."""
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import asyncio
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from contextlib import suppress
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import logging
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from typing import Optional
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from aiohttp import WSMsgType, web
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import async_timeout
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from homeassistant.components.http import HomeAssistantView
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from homeassistant.const import EVENT_HOMEASSISTANT_STOP
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from homeassistant.core import callback
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from homeassistant.helpers.event import async_call_later
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from .auth import AuthPhase, auth_required_message
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from .const import (
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CANCELLATION_ERRORS,
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DATA_CONNECTIONS,
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MAX_PENDING_MSG,
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PENDING_MSG_PEAK,
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PENDING_MSG_PEAK_TIME,
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SIGNAL_WEBSOCKET_CONNECTED,
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SIGNAL_WEBSOCKET_DISCONNECTED,
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URL,
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)
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from .error import Disconnect
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from .messages import message_to_json
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# mypy: allow-untyped-calls, allow-untyped-defs, no-check-untyped-defs
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_WS_LOGGER = logging.getLogger(f"{__name__}.connection")
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class WebsocketAPIView(HomeAssistantView):
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"""View to serve a websockets endpoint."""
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name = "websocketapi"
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url = URL
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requires_auth = False
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async def get(self, request: web.Request) -> web.WebSocketResponse:
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"""Handle an incoming websocket connection."""
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return await WebSocketHandler(request.app["hass"], request).async_handle()
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class WebSocketAdapter(logging.LoggerAdapter):
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"""Add connection id to websocket messages."""
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def process(self, msg, kwargs):
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"""Add connid to websocket log messages."""
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return f'[{self.extra["connid"]}] {msg}', kwargs
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class WebSocketHandler:
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"""Handle an active websocket client connection."""
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def __init__(self, hass, request):
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"""Initialize an active connection."""
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self.hass = hass
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self.request = request
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self.wsock: Optional[web.WebSocketResponse] = None
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self._to_write: asyncio.Queue = asyncio.Queue(maxsize=MAX_PENDING_MSG)
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self._handle_task = None
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self._writer_task = None
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self._logger = WebSocketAdapter(_WS_LOGGER, {"connid": id(self)})
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self._peak_checker_unsub = None
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async def _writer(self):
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"""Write outgoing messages."""
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# Exceptions if Socket disconnected or cancelled by connection handler
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with suppress(RuntimeError, ConnectionResetError, *CANCELLATION_ERRORS):
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while not self.wsock.closed:
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message = await self._to_write.get()
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if message is None:
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break
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self._logger.debug("Sending %s", message)
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if not isinstance(message, str):
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message = message_to_json(message)
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await self.wsock.send_str(message)
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# Clean up the peaker checker when we shut down the writer
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if self._peak_checker_unsub:
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self._peak_checker_unsub()
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self._peak_checker_unsub = None
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@callback
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def _send_message(self, message):
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"""Send a message to the client.
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Closes connection if the client is not reading the messages.
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Async friendly.
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"""
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try:
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self._to_write.put_nowait(message)
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except asyncio.QueueFull:
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self._logger.error(
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"Client exceeded max pending messages [2]: %s", MAX_PENDING_MSG
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)
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self._cancel()
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if self._to_write.qsize() < PENDING_MSG_PEAK:
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if self._peak_checker_unsub:
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self._peak_checker_unsub()
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self._peak_checker_unsub = None
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return
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if self._peak_checker_unsub is None:
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self._peak_checker_unsub = async_call_later(
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self.hass, PENDING_MSG_PEAK_TIME, self._check_write_peak
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)
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@callback
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def _check_write_peak(self, _):
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"""Check that we are no longer above the write peak."""
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self._peak_checker_unsub = None
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if self._to_write.qsize() < PENDING_MSG_PEAK:
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return
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self._logger.error(
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"Client unable to keep up with pending messages. Stayed over %s for %s seconds",
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PENDING_MSG_PEAK,
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PENDING_MSG_PEAK_TIME,
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)
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self._cancel()
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@callback
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def _cancel(self):
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"""Cancel the connection."""
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self._handle_task.cancel()
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self._writer_task.cancel()
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async def async_handle(self) -> web.WebSocketResponse:
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"""Handle a websocket response."""
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request = self.request
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wsock = self.wsock = web.WebSocketResponse(heartbeat=55)
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await wsock.prepare(request)
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self._logger.debug("Connected from %s", request.remote)
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self._handle_task = asyncio.current_task()
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@callback
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def handle_hass_stop(event):
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"""Cancel this connection."""
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self._cancel()
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unsub_stop = self.hass.bus.async_listen(
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EVENT_HOMEASSISTANT_STOP, handle_hass_stop
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)
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# As the webserver is now started before the start
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# event we do not want to block for websocket responses
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self._writer_task = asyncio.create_task(self._writer())
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auth = AuthPhase(self._logger, self.hass, self._send_message, request)
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connection = None
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disconnect_warn = None
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try:
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self._send_message(auth_required_message())
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# Auth Phase
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try:
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with async_timeout.timeout(10):
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msg = await wsock.receive()
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except asyncio.TimeoutError as err:
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disconnect_warn = "Did not receive auth message within 10 seconds"
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raise Disconnect from err
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if msg.type in (WSMsgType.CLOSE, WSMsgType.CLOSING):
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raise Disconnect
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if msg.type != WSMsgType.TEXT:
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disconnect_warn = "Received non-Text message."
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raise Disconnect
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try:
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msg_data = msg.json()
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except ValueError as err:
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disconnect_warn = "Received invalid JSON."
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raise Disconnect from err
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self._logger.debug("Received %s", msg_data)
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connection = await auth.async_handle(msg_data)
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self.hass.data[DATA_CONNECTIONS] = (
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self.hass.data.get(DATA_CONNECTIONS, 0) + 1
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)
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self.hass.helpers.dispatcher.async_dispatcher_send(
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SIGNAL_WEBSOCKET_CONNECTED
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)
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# Command phase
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while not wsock.closed:
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msg = await wsock.receive()
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if msg.type in (WSMsgType.CLOSE, WSMsgType.CLOSING):
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break
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if msg.type != WSMsgType.TEXT:
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disconnect_warn = "Received non-Text message."
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break
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try:
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msg_data = msg.json()
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except ValueError:
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disconnect_warn = "Received invalid JSON."
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break
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self._logger.debug("Received %s", msg_data)
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connection.async_handle(msg_data)
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except asyncio.CancelledError:
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self._logger.info("Connection closed by client")
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except Disconnect:
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pass
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except Exception: # pylint: disable=broad-except
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self._logger.exception("Unexpected error inside websocket API")
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finally:
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unsub_stop()
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if connection is not None:
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connection.async_close()
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try:
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self._to_write.put_nowait(None)
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# Make sure all error messages are written before closing
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await self._writer_task
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await wsock.close()
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except asyncio.QueueFull: # can be raised by put_nowait
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self._writer_task.cancel()
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finally:
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if disconnect_warn is None:
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self._logger.debug("Disconnected")
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else:
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self._logger.warning("Disconnected: %s", disconnect_warn)
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if connection is not None:
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self.hass.data[DATA_CONNECTIONS] -= 1
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self.hass.helpers.dispatcher.async_dispatcher_send(
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SIGNAL_WEBSOCKET_DISCONNECTED
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)
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return wsock
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