django-channels：找不到路径的路径

Question

我有一个 Django + Vue.js 聊天应用程序，我正在尝试连接到 django-channels。

要访问任何聊天室，您只需转到：

http://localhost:8080/rooms/"id"/

我的 javascript 连接如下所示：

connectToWebSocket () {
  const chatSocket = new WebSocket(
    `ws://localhost:8000/ws/rooms/${this.$route.params.id}/`
  )

  chatSocket.onopen = this.onOpen
  chatSocket.onclose = this.onClose
  chatSocket.onmessage = this.onMessage
  chatSocket.onerror = this.onError
},

我的消费者.py：

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

    # Join room group
    async_to_sync(self.channel_layer.group_add)(
        self.room_group_name,
        self.channel_name
    )

    self.accept()

def disconnect(self, close_code):
    # Leave room group
    async_to_sync(self.channel_layer.group_discard)(
        self.room_group_name,
        self.channel_name
    )

# Receive message from WebSocket
def receive(self, text_data):
    text_data_json = json.loads(text_data)
    message = text_data_json['message']
    user = text_data_json['user.username']

    # Send message to room group
    async_to_sync(self.channel_layer.group_send)(
        self.room_group_name,
        {
            'type': 'chat_message',
            'user': user,
            'message': message
        }
    )

# Receive message from room group
def chat_message(self, event):
    user = event['user']
    message = event['message']

    # Send message to WebSocket
    self.send(text_data=json.dumps({
        'user': user,
        'message': message
    }))

还有我的 routing.py：

from django.conf.urls import url

from core import consumers


websocket_urlpatterns = [
    url(r'^ws/rooms/<uri>/', consumers.ChatConsumer),
]

我的项目routing.py：

from channels.auth import AuthMiddlewareStack
from channels.routing import ProtocolTypeRouter, URLRouter

import core.routing


application = ProtocolTypeRouter({
    'websocket': AuthMiddlewareStack(
        URLRouter(
            core.routing.websocket_urlpatterns
        )
    )
})

问题是，我无法连接到 websocket，我的 django 服务器说：

[失败实例：回溯：：找不到路径“ws/rooms/759b9a8262ea4b7/”的路由。

我无法通过 websocket 连接到特定房间的代码有什么问题？

完整的堆栈跟踪：

[失败实例：回溯：：找不到路径“ws/rooms/759b9a8262ea4b7/”的路由。 /home/dave/PycharmProjects/chatapp2/back/venv/lib/python3.6/site-packages/autobahn/websocket/protocol.py:2801:processHandshake /home/dave/PycharmProjects/chatapp2/back/venv/lib/python3.6/site-packages/txaio/tx.py:429:as_future /home/dave/PycharmProjects/chatapp2/back/venv/lib/python3.6/site-packages/twisted/internet/defer.py:151:maybeDeferred /home/dave/PycharmProjects/chatapp2/back/venv/lib/python3.6/site-packages/daphne/ws_protocol.py:82:onConnect --- --- /home/dave/PycharmProjects/chatapp2/back/venv/lib/python3.6/site-packages/twisted/internet/defer.py:151:maybeDeferred /home/dave/PycharmProjects/chatapp2/back/venv/lib/python3.6/site-packages/daphne/server.py:198:create_application /home/dave/PycharmProjects/chatapp2/back/venv/lib/python3.6/site-packages/channels/staticfiles.py:41:调用 /home/dave/PycharmProjects/chatapp2/back/venv/lib/python3.6/site-packages/channels/routing.py:58:调用 /home/dave/PycharmProjects/chatapp2/back/venv/lib/python3.6/site-packages/channels/sessions.py:43:调用 /home/dave/PycharmProjects/chatapp2/back/venv/lib/python3.6/site-packages/channels/sessions.py:141:调用 /home/dave/PycharmProjects/chatapp2/back/venv/lib/python3.6/site-packages/channels/sessions.py:165:init /home/dave/PycharmProjects/chatapp2/back/venv/lib/python3.6/site-packages/channels/middleware.py:31:调用 /home/dave/PycharmProjects/chatapp2/back/venv/lib/python3.6/site-packages/channels/routing.py:154:调用

Answer 1

试试这样的：

routing.py（在您的 django 应用程序中）

from django.urls import path
from core import consumers

websocket_urlpatterns = [
    path('ws/rooms/<uri>/', consumers.ChatConsumer),
]

routing.py（与您的 settings.py 级别相同）

from channels.auth import AuthMiddlewareStack
from channels.routing import ProtocolTypeRouter, URLRouter
import myapp.routing

application = ProtocolTypeRouter({
    # (http->django views is added by default)
    'websocket': AuthMiddlewareStack(
        URLRouter(
            myapp.routing.websocket_urlpatterns
        )
    ),
})

最后在你的 settings.py 中

CHANNEL_LAYERS = {
    'default': {
        'BACKEND': 'channels_redis.core.RedisChannelLayer',
        'CONFIG': {
            "hosts": [REDIS_URL],
        },
    },
}

INSTALLED_APPS.append('channels')
ASGI_APPLICATION = 'myapp.routing.application'

Answer 2

我遇到了和你一样的问题，刚才正好解决了！ 在我的 ws_client.py 我写了这个

ws.create_connection("ws://127.0.0.1:8000/alarm")

在routing.py中我改成了下面这个，它工作了

from django.urls import path
channel_routing = [
    path('alarm',consumers.ws_message),
    # before I wrote 'alarm/', I just change from alarm/ to alarm
]

它成功了！你可以试试

Answer 3

你需要使用url，我遇到了同样的问题：

不工作

websocket_urlpatterns = [
  path('ws/chat/<str:room_name>/$', consumers.ChatConsumer),
]

工作

websocket_urlpatterns = [
   url(r'^ws/chat/(?P<room_name>[^/]+)/$', consumers.ChatConsumer),
]

Answer 4

从 app.routing 路由文件中删除斜杠解决了这个问题，我猜它在该套接字的 URL 中被计算为重复斜杠。

例如，我有：

url(r'/ws/documents/get-df', consumers.DFConsumer.as_asgi())

这不起作用，但是当我删除之前的第一个斜杠时它起作用了

url(r'ws/documents/get-df', consumers.DFConsumer.as_asgi())

Answer 5

我有类似的问题并添加了 .as_asgi() 并且它有效

url(r"messages/(?P<username>[\w.@+-]+)/", ChatConsumer.as_asgi()),

Answer 6

致任何可能面临此问题的新人。不要将path 模式匹配器与正则表达式一起使用。如果您想使用，请改用url 或re_path。

使用path

匹配没有尾随或前导斜杠 (/) 的模式，并确保模式与客户端 Web 套接字 URL 对应

websocket_urlpatterns = [
    path("ws/chat/<int:uri>", ChatConsumer.as_asgi()),
]

使用re_path 或url

匹配不带斜杠 (/) 的模式。

url(r'^ws/chat/(?P<uri>[^/]+)/$', ChatConsumer.as_asgi()),

注意：我建议使用path，因为它更容易匹配模式和阅读。

Answer 7

您可能需要重新启动服务，似乎不会自动重新加载。