django channels error message on websocket start (Sessions.py)

Question

Whenever I start my django channels websocket. I get this:

2019-01-10 00:24:09,463 - WARNING - server - Application instance <Task pending coro=<SessionMiddlewareInstance.__call__() running at C:\Users\JAYK~1\Envs\jyst\lib\site-packages\channels\sessions.py:175> wait_for=<Future pending cb=[<TaskWakeupMethWrapper object at 0x000001B067F32E58>()]>> for connection <WebSocketProtocol client=['127.0.0.1', 57367] path=b'/jysts/m/KIDA_TG'> took too long to shut down and was killed.

Where did you add StopConsumer() ?? I have the same issue. — Mwibutsa Floribert
– Mwibutsa Floribert, Commented Jul 26, 2020 at 5:48
stackoverflow.com/questions/53445286/… Please refer to this. You should be raising it on disconnect — NduJay
– NduJay, Commented Jul 26, 2020 at 23:07

Lewis · Accepted Answer · 2021-12-02 15:48:06Z

1

My application was raising the same Warning as stated in the question. After some time it would kill the asgi application and the Websocket could no longer be connected to until i restarted the service manually.

For me it was adding raise StopConsumer() to the disconnect function:

def disconnect(self, close_code):
 # Leave room group
    async_to_sync(self.channel_layer.group_discard)(
        self.room_group_name,
        self.channel_name
    )
    raise StopConsumer()

As stated by the Channel Documentation: "you need to raise channels.exceptions.StopConsumer to halt the ASGI application cleanly and let the server clean it up. If you leave it running - by not raising this exception - the server will reach its application close timeout (which is 10 seconds by default in Daphne) and then kill your application and raise a warning."

answered Dec 2, 2021 at 15:48

Lewis

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