Using Django-channels3 on connecting throwing error

Question

I am using Django-Channels3 with django-redis, following a youtube tutorial, being a newbie @ Websockets, i got no idea, why WebSocketKing Client throwing this error

Could not connect to "ws://localhost:8000/ws/test/". You may be able to find more information using Inspector/Dev Tools on this page.

Error :-

WebSocket HANDSHAKING /ws/test/ [127.0.0.1:58045] Exception inside application: __call__() missing 1 required positional argument: 'send' Traceback (most recent call last): File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/channels/staticfiles.py", line 44, in __call__ return await self.application(scope, receive, send) File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/channels/routing.py", line 71, in __call__ return await application(scope, receive, send) File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/channels/routing.py", line 150, in __call__ return await application( File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/asgiref/compatibility.py", line 35, in new_application return await instance(receive, send) TypeError: __call__() missing 1 required positional argument: 'send' WebSocket DISCONNECT /ws/test/ [127.0.0.1:58045]

consumers.py

from channels.generic.websocket import WebsocketConsumer from asgiref.sync import async_to_sync import json class TestConsumer(WebsocketConsumer): def connect(self): self.room_name = "test_consumer" self.room_group_name = "test_consumer_group" async_to_sync(self.channel_layer.group_add)( self.room_name, self.room_group_name ) self.accept() self.send(text_data=json.dumps({'status' : 'connected'})) # def receive(self): # pass # def disconnect(self): # pass

asgi.py

import os from django.core.asgi import get_asgi_application from channels.routing import ProtocolTypeRouter, URLRouter from django.urls import path from home.consumers import * os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'dj_channels.settings') application = get_asgi_application() ws_patterns = [ path('ws/test/', TestConsumer) ] application = ProtocolTypeRouter({ 'websocket' : URLRouter(ws_patterns) })

Settings.py

INSTALLED_APPS = [ 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'channels', 'home', ] ROOT_URLCONF = 'dj_channels.urls' # WSGI_APPLICATION = 'dj_channels.wsgi.application' ASGI_APPLICATION = 'dj_channels.asgi.application' CHANNEL_LAYERS = { "default": { "BACKEND": "channels_redis.core.RedisChannelLayer", "CONFIG": { "hosts": [("localhost", 6379)], }, }, }

From what I understand you want just notify on the frontend that the user is connected and websocket is working; try running the self.send({"type": "websocket.send", "text": "connected", }) — Chinmay Dali
– Chinmay Dali, Commented Jul 28, 2021 at 18:21

Yogesh Agarwal · Accepted Answer · 2022-04-12 06:39:47Z

In Asgi.py file use

ws_patterns = [ path('ws/test/', TestConsumer.as_asgi()) ]

Instead of Using

ws_patterns = [ path('ws/test/', TestConsumer) ]

Then It should work.

Al Jaber Nishad · Accepted Answer · 2022-04-19 05:18:40Z

You need to do two things to solve this problem.

In asgi.py file, use

ws_patterns = [ path('ws/test/', TestConsumer.as_asgi()) ]

In consumers.py file, you don't need to call async_to_sync() method.

self.channel_layer.group_add( 'test_consumer', self.channel_name )

Collectives™ on Stack Overflow

Using Django-channels3 on connecting throwing error

2 Answers 2

Comments

Comments

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Related