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]
> <javascript:>> 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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