Django-Channels:如何从user_id获取channel_name？

Question

下面的代码打印客户端的channel_name

class ChatConsumer(WebsocketConsumer):
    def connect(self):
        self.room_name = self.scope['url_route']['kwargs']['room_name']
        self.room_group_name = 'chat_%s' % self.room_name
        print(self.channel_name)

如何从user_id (user.id)获取经过身份验证的用户的channel_name (需要从消费者外部访问)？类似于下面的内容

import foo
channel_name=foo.get_channel_name_from_user_id(user_id)
print(channel_name)

谢谢!新年快乐！

Answer 1

self.channel_name不与用户类关联，而是与“AsyncWebsocketConsumer”关联；

如果需要，可以通过显式定义通道层名称来完全指定基于user_id的channel_name

async def connect(self):
    user = self.scope['user']

    if user.is_anonymous:
        print("user was unknown")
        await self.close()
    else:
        await self.channel_layer.group_add(
            group=self.doc_pat_grp_id,
            channel=user.id#the channel-name
        )
        await self.accept()

Using Channel-layer outside of consumer

#The python code; like you mentioned above.
import foo
from django.contrib.auth import get_user_model
from channels.layers import get_channel_layer
from asgiref.sync import async_to_sync 
#since django runs synchronously and channel_layer runs asynchronous 
#we need to explicitly tell channel_layer to run it in synchronous

user = get_user_model()
channel_layer = get_channel_layer()
print(channel_layer)