Django channels: messages are duplicated in a one channel - django-channels

Question

I'm going through official Django Channels tutorial and get stacked with the same problem as this guy:
Django Channels group send only sends the message to last channel
So, I have a bunch of standard files:
# asgi.py
import os
from channels.auth import AuthMiddlewareStack
from channels.routing import ProtocolTypeRouter, URLRouter
from django.core.asgi import get_asgi_application
import chat.routing
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'mysite.settings')
application = ProtocolTypeRouter({
"http": get_asgi_application(),
"websocket": AuthMiddlewareStack(
URLRouter(
chat.routing.websocket_urlpatterns
)
),
})
# routing.py
from django.urls import re_path
from . import consumers
websocket_urlpatterns = [
re_path(r'ws/chat/(?P<room_name>\w+)/$', consumers.ChatConsumer.as_asgi()),
]
# consumers.py
import json
from channels.generic.websocket import AsyncWebsocketConsumer
class ChatConsumer(AsyncWebsocketConsumer):
async def connect(self):
self.room_name = self.scope['url_route']['kwargs']['room_name']
self.room_group_name = 'chat_%s' % self.room_name
await self.channel_layer.group_add(
self.room_group_name,
self.channel_name
)
await self.accept()
async def disconnect(self, close_code):
await self.channel_layer.group_discard(
self.room_group_name,
self.channel_name
)
async def receive(self, text_data):
print('def receive from websocket')
text_data_json = json.loads(text_data)
message = text_data_json['message']
await self.channel_layer.group_send(
self.room_group_name,
{
'type': 'chat_message',
'message': message
}
)
async def chat_message(self, event):
message = event['message']
await self.send(text_data=json.dumps({
'message': message
}))
And a part of settings.py
ASGI_APPLICATION = 'mysite.asgi.application'
CHANNEL_LAYERS = {
'default': {
'BACKEND': 'channels_redis.core.RedisChannelLayer',
'CONFIG': {
"hosts": [('127.0.0.1', 6379)],
},
},
}
This is a simple chat room. I open two tabs in the same browser, text "Hello" in the first one and get two "Hello" inside of the second tab with zero "Hello" in the first tab.
UPDATE!!!
I made some experiments and I think that consumers functions work correctly (I logged channel_name parameter during the messages sending and inside def receive() I can see exactly that channel_name, from which I sent a message, and at the same time inside def chat_message() I can see all channels). So, the problem should be in js?
<textarea id="chat-log" cols="100" rows="20"></textarea><br>
<input id="chat-message-input" type="text" size="100"><br>
<input id="chat-message-submit" type="button" value="Send">
{{ room_name|json_script:"room-name" }}
<script>
const roomName = JSON.parse(document.getElementById('room-name').textContent);
const chatSocket = new WebSocket(
'ws://'
+ window.location.host
+ '/ws/chat/'
+ roomName
+ '/'
);
chatSocket.onmessage = function(e) {
const data = JSON.parse(e.data);
document.querySelector('#chat-log').value += (data.message + '\n');
};
chatSocket.onclose = function(e) {
console.error('Chat socket closed unexpectedly');
};
document.querySelector('#chat-message-input').focus();
document.querySelector('#chat-message-input').onkeyup = function(e) {
if (e.keyCode === 13) { // enter, return
document.querySelector('#chat-message-submit').click();
}
};
document.querySelector('#chat-message-submit').onclick = function(e) {
const messageInputDom = document.querySelector('#chat-message-input');
const message = messageInputDom.value;
chatSocket.send(JSON.stringify({
'message': message
}));
messageInputDom.value = '';
};
</script>

Answer 1

The problem is solved. In my case it was with django environment. I used the common one, which I also use for other projects. Maybe the reason of issue was in conflict between some installs. I've created a new environment, installed django and channels and everything is working now.

Answer 2

I faced this issue too. I think this is a bug in channels=3.0.0
I upgraded to channels=3.0.4 and it is working now!