I tried not having CHANNEL_LAYERS or setting it to {}
same exception
On Saturday, February 3, 2018 at 3:36:43 AM UTC+2, Andrew Godwin wrote:
>
> Do you have a CHANNEL_LAYERS setting in your settings file? If so, what is
> it set to?
>
> Andrew
>
> On Fri, Feb 2, 2018 at 5:17 PM, Ahmed Magdy <[email protected]
> <javascript:>> wrote:
>
>> That's what I did after reading the documentation here's how my channels
>> files look like
>>
>> # settings.py
>> # ...
>> ASGI_APPLICATION = 'djangoChannels.routing.application'
>> # ...
>>
>> # routing.py
>> from django.conf.urls import url
>>
>> from channels.routing import ProtocolTypeRouter, URLRouter
>> from channels.auth import AuthMiddlewareStack
>>
>> from .consumers import ChatConsumer
>>
>> application = ProtocolTypeRouter({
>> # Empty for now (http->django views is added by default)
>> 'websocket': AuthMiddlewareStack(
>> URLRouter([
>> url('^sessions/$', ChatConsumer)
>> ])
>> )
>> })
>>
>> # consumers.py
>> from asgiref.sync import AsyncToSync
>> from channels.generic.websocket import WebsocketConsumer
>>
>> class ChatConsumer(WebsocketConsumer):
>>
>> def connect(self):
>> AsyncToSync(self.channel_layer.group_add)("chat", self
>> .channel_name)
>>
>> def disconnect(self):
>> AsyncToSync(self.channel_layer.group_discard)("chat", self
>> .channel_name)
>>
>>
>> After connecting with JS websocket to
>>
>> ws://127.0.0.1:8000/sessions/
>>>
>>
>> Raises an exception
>>
>> Performing system checks...
>>>
>>> System check identified no issues (0 silenced).
>>> February 03, 2018 - 03:14:29
>>> Django version 2.0.2, using settings 'djangoChannels.settings'
>>> Starting ASGI/Channels development server at http://127.0.0.1:8000/
>>> Quit the server with CTRL-BREAK.
>>> 2018-02-03 03:14:29,799 - INFO - server - HTTP/2 support not enabled
>>> (install the http2 and tls Twisted extras)
>>> 2018-02-03 03:14:29,800 - INFO - server - Listening on endpoint
>>> tcp:port=8000:interface=127.0.0.1
>>> [2018/02/03 03:14:32] WebSocket HANDSHAKING /sessions/ [127.0.0.1:8631]
>>> ERROR:root:Exception inside application: 'NoneType' object has no
>>> attribute 'group_add'
>>> File "c:\python35\Lib\asyncio\tasks.py", line 241, in _step
>>> result = coro.throw(exc)
>>> File
>>> "D:\Programming\DjangoWebsite\HUWebsite\lib\site-packages\channels\consumer.py",
>>>
>>> line 53, in __call__
>>> await await_many_dispatch([receive], self.dispatch)
>>> File
>>> "D:\Programming\DjangoWebsite\HUWebsite\lib\site-packages\channels\utils.py",
>>>
>>> line 48, in await_many_dispatch
>>> await dispatch(result)
>>> File
>>> "D:\Programming\DjangoWebsite\HUWebsite\lib\site-packages\asgiref\sync.py",
>>> line 84, in inner
>>> return await async_func(*args, **kwargs)
>>> File
>>> "D:\Programming\DjangoWebsite\HUWebsite\lib\site-packages\asgiref\sync.py",
>>> line 67, in __call__
>>> return await asyncio.wait_for(future, timeout=None)
>>> File "c:\python35\Lib\asyncio\tasks.py", line 367, in wait_for
>>> return (yield from fut)
>>> File "c:\python35\Lib\asyncio\futures.py", line 358, in __iter__
>>> yield self # This tells Task to wait for completion.
>>> File "c:\python35\Lib\asyncio\tasks.py", line 290, in _wakeup
>>> future.result()
>>> File "c:\python35\Lib\asyncio\futures.py", line 274, in result
>>> raise self._exception
>>> File "c:\python35\Lib\concurrent\futures\thread.py", line 55, in run
>>> result = self.fn(*self.args, **self.kwargs)
>>> File
>>> "D:\Programming\DjangoWebsite\HUWebsite\lib\site-packages\asgiref\sync.py",
>>> line 76, in thread_handler
>>> raise e
>>> File
>>> "D:\Programming\DjangoWebsite\HUWebsite\lib\site-packages\asgiref\sync.py",
>>> line 74, in thread_handler
>>> self.func(*args, **kwargs)
>>> File
>>> "D:\Programming\DjangoWebsite\HUWebsite\lib\site-packages\channels\consumer.py",
>>>
>>> line 93, in dispatch
>>> handler(message)
>>> File
>>> "D:\Programming\DjangoWebsite\HUWebsite\lib\site-packages\channels\generic\websocket.py",
>>>
>>> line 19, in websocket_connect
>>> self.connect()
>>> File
>>> "D:\Programming\DjangoWebsite\HUWebsite\husite\djangoChannels\djangoChannels\consumers.py",
>>>
>>> line 8, in connect
>>> AsyncToSync(self.channel_layer.group_add)("chat", self.channel_name)
>>> 'NoneType' object has no attribute 'group_add'
>>> [2018/02/03 03:14:32] WebSocket DISCONNECT /sessions/ [127.0.0.1:8631]
>>>
>>
>>
>> On Friday, February 2, 2018 at 7:37:36 PM UTC+2, Andrew Godwin wrote:
>>>
>>> Hi Ahmed,
>>>
>>> In the new release channel layers are optional - if you don't configure
>>> them they will indeed come through as None. The settings format changed
>>> slightly too - you can read more here:
>>> http://channels.readthedocs.io/en/latest/topics/channel_layers.html
>>>
>>> Andrew
>>>
>>> On Fri, Feb 2, 2018 at 3:31 AM, Ahmed Magdy <[email protected]> wrote:
>>>
>>>> I'm relatively new to channels and was using Channels v1.x.x groups
>>>> easily, but after v2.0.0 update and reading the documentation
>>>>
>>>> # This example uses WebSocket consumer, which is synchronous, and so
>>>> # needs the async channel layer functions to be converted.
>>>> from asgiref.sync import AsyncToSync
>>>>
>>>> class ChatConsumer(WebsocketConsumer):
>>>>
>>>> def connect(self):
>>>> AsyncToSync(self.channel_layer.group_add)("chat",
>>>> self.channel_name)
>>>>
>>>> def disconnect(self):
>>>> AsyncToSync(self.channel_layer.group_discard)("chat",
>>>> self.channel_name)
>>>>
>>>> Enter code here...
>>>>
>>>> channel_layer, channel_name are always NoneType and exception occurs.
>>>>
>>>> Is that because I didn't configure channel layers? But in the old
>>>> version I also used the in memory type and Groups were working well.
>>>>
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>>>
>>>
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>
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