Python django“U频道”；“文件末尾的读取器”；例外

我已经实现了

django\u频道
AsyncJsonWebsocketConsumer
消费者，他们订阅了
“chat”
组：

from channels.generic.websocket import AsyncJsonWebsocketConsumer

class CeleryTaskConsumer(AsyncJsonWebsocketConsumer):
    async def connect(self):
        await self.accept()
        await self.channel_layer.group_add(group='chat', channel=self.channel_name)

    async def new_message_handler(self, event):
        await self.send_json(content={'event': event})

import channels.layers
from asgiref.sync import async_to_sync

def send_notification():
    channel_layer = channels.layers.get_channel_layer()
    async_to_sync(channel_layer.group_send)("chat", {
        'type': 'new.message.handler',
        'message': 'Hello world!'
    })

然后我定期向
聊天组发送消息：

from channels.generic.websocket import AsyncJsonWebsocketConsumer

class CeleryTaskConsumer(AsyncJsonWebsocketConsumer):
    async def connect(self):
        await self.accept()
        await self.channel_layer.group_add(group='chat', channel=self.channel_name)

    async def new_message_handler(self, event):
        await self.send_json(content={'event': event})

import channels.layers
from asgiref.sync import async_to_sync

def send_notification():
    channel_layer = channels.layers.get_channel_layer()
    async_to_sync(channel_layer.group_send)("chat", {
        'type': 'new.message.handler',
        'message': 'Hello world!'
    })

一切正常，但我经常遇到这样的例外：

Exception inside application: Reader at end of file
  File "/usr/lib64/python3.6/asyncio/coroutines.py", line 129, in throw
    return self.gen.throw(type, value, traceback)
  File "/venv/lib64/python3.6/site-packages/channels/consumer.py", line 59, in __call__
    [receive, self.channel_receive], self.dispatch
  File "/usr/lib64/python3.6/asyncio/coroutines.py", line 129, in throw
    return self.gen.throw(type, value, traceback)
  File "/venv/lib64/python3.6/site-packages/channels/utils.py", line 59, in await_many_dispatch
    await task
  File "/venv/lib64/python3.6/site-packages/channels/utils.py", line 51, in await_many_dispatch
    result = task.result()
  File "/usr/lib64/python3.6/asyncio/coroutines.py", line 126, in send
    return self.gen.send(value)
  File "/venv/lib64/python3.6/site-packages/channels_redis/core.py", line 429, in receive
    real_channel
  File "/usr/lib64/python3.6/asyncio/coroutines.py", line 110, in __next__
    return self.gen.send(None)
  File "/venv/lib64/python3.6/site-packages/channels_redis/core.py", line 484, in receive_single
    index, channel_key, timeout=self.brpop_timeout
  File "/usr/lib64/python3.6/asyncio/coroutines.py", line 110, in __next__
    return self.gen.send(None)
  File "/venv/lib64/python3.6/site-packages/channels_redis/core.py", line 327, in _brpop_with_clean
    await connection.eval(cleanup_script, keys=[], args=[channel, backup_queue])
  File "/venv/lib64/python3.6/site-packages/aioredis/commands/scripting.py", line 12, in eval
    return self.execute(b'EVAL', script, len(keys), *(keys + args))
  File "/venv/lib64/python3.6/site-packages/aioredis/commands/__init__.py", line 51, in execute
    return self._pool_or_conn.execute(command, *args, **kwargs)
  File "/venv/lib64/python3.6/site-packages/aioredis/connection.py", line 319, in execute
    raise ConnectionClosedError(msg)
  Reader at end of file

我不知道是什么原因造成的，如何修复

我正在使用Python
3.6.6
、redis server
5.0.4
和这些Python包：

Django==2.1.5
aioredis==1.2.0
asgiref==2.3.2
async-timeout==3.0.1
asyncio==3.4.3
channels==2.1.7
channels_redis==2.3.3
daphne==2.2.5
hiredis==0.2.0
msgpack==0.6.0
twisted==18.9.0

你试过
'new.message.handler'
-->
'new\u message\u handler'
？@BearBrown是的，我试过了。在这两种情况下都会调用
新消息处理程序
。正如我提到的，我的示例按预期工作，但有时我会出现随机错误。这是怎么回事？在
accept（）
@PankajSharma之前写这行
wait self.channel\u layer.group\u add（group='chat'，channel=self.channel\u name）
，我刚刚尝试了这个修改，但是没有效果。我仍然随机得到
“文件末尾的读取器”
异常。