Question 121404 in Redis Question posted in
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Redis – How to send data to a websocket from outside of consumer django channels

I’m trying to send data to a websocket from outside of the consumer

so i did following:

settings.py

CHANNEL_LAYERS = {
    "default": {
        "BACKEND": "channels_redis.core.RedisChannelLayer",
        "CONFIG": {
            "hosts": [("127.0.0.1", 6379)],
        },
    },
}

routing.py

from django.urls import path

from .consumers import CoinsListConsumer

websocket_urlpatterns = [
    path('ws/coins/', CoinsListConsumer.as_asgi())
]

asgi.py

import os

from django.core.asgi import get_asgi_application
from channels.auth import AuthMiddlewareStack
from channels.routing import ProtocolTypeRouter, URLRouter
from channels.security.websocket import AllowedHostsOriginValidator

from apps.coins.routing import websocket_urlpatterns

os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'config.settings.local')

application = ProtocolTypeRouter({
    'http': get_asgi_application(),
    'websocket': AllowedHostsOriginValidator(
        AuthMiddlewareStack(
            URLRouter(
                websocket_urlpatterns,
            )
        )
    )
})

consumers.py

class CoinsListConsumer(AsyncWebsocketConsumer):
    async def connect(self):
        logger.info('Websocket was connected.')
        await self.accept()
    
    async def disconnect(self, code):
        logger.warning('Websocket was disconnected.')
        pass

    async def receive(self, text_data=None, bytes_data=None):
        return await super().receive(text_data, bytes_data)

well this is ok and when i go to a view… the websocket will connect very well

but when i want to send data to the websocket.

def send_data_to_websocket_coins_list_view(data: List[Dict]) -> None:
    """Send data to websocket coins list view """
    async_to_sync(channel_layer.send)(json.dumps(data))

This did not work and raised following error
TypeError: send() missing 1 required positional argument: 'message'

Also in the documentation this is should work by following code

async_to_sync(channel_layer.send)("channel_name", json.dumps({...}))

its also not worked and raise the following error
AssertionError: message is not a dict

So what is the problem? what should i do?

Tags:

2

Answers


  1. 0

    You don’t need to dump data

    async_to_sync(channel_layer.send)(data)
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  2. 0

    You can use it in an ApiView for example:

    from channels.layers import get_channel_layer
from asgiref.sync import async_to_sync

class NotificationView(APIView):
    def post(self, request, *args, **kwargs):
        # Process the notification
        notification_data = {'message': 'New notification'}

        # Send the notification to the WebSocket consumer
        channel_layer = get_channel_layer()
        async_to_sync(channel_layer.group_send)(
            'notifications',
            {'type': 'send_notification', 'text': json.dumps(notification_data)}
        )

        return Response(status=status.HTTP_200_OK)
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