Django achieve websocket

django achieve websocket generally, there are two ways, one channels, one is dwebsocket. channels depends on redis, twisted, etc.

A dwebsocket

1 Django achieve Websocket

django achieve websocket generally, there are two ways, one channels, one is dwebsocket. channels depends on the redis, twisted, etc., compared to use dwebsocket to be more convenient for some

2 dwebsocket installation

pip3 install dwebsocket

3 dwebsocket Configuration

setting setting

INSTALLED_APPS = [
    ...
    ...   
    ' Dwebsocket ' 
]

import dwebsocket
The MIDDLEWARE_CLASSES = [
     ' dwebsocket.middleware.WebSocketMiddleware '   # all URL websocket to provide, if necessary, only a single view is not selected 
]
WEBSOCKET_ACCEPT_ALL = True   　　　　　　　　　　　　  # may allow each individual practical view websockets

urls.py

from django.conf.urls import url
from django.contrib import admin
from app01 import views

urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^login/', views.login),
    url(r'^path/', views.path),
]

views.py

from django.shortcuts import render


def login(request):
    return render(request, 'index.html')


from dwebsocket.decorators import accept_websocket


@accept_websocket
def path(request):
    if request.is_websocket():
        print(1)
        request.websocket.send ( ' download completes ' .encode ( ' UTF-. 8 ' ))

html

<body>
　　<button onclick="WebSocketTest()">test</button>
</body>


<script>
    function WebSocketTest() {
        if ("WebSocket" in window) {
            Alert ( " Your browser supports the WebSocket! " );

            // Open a web socket
            var ws = new WebSocket("ws://127.0.0.1:8000/path/");
            console.log('ws',ws)

            ws.onopen = function () {
                 // the Web is the Socket connection, using the send () method for transmitting data
                ws.send ( " transmit data " );
                Alert ( " data transmission ... " );
            };

            ws.onmessage = function (evt) {
                var received_msg = evt.data;
                Alert ( " data has been received ... " );
                Alert ( " Data: " + received_msg)
            };

            ws.onclose = function () {
                // 关闭 websocket
                Alert ( " Connection closed ... " );
            };
        }

        the else {
             // browser does not support WebSocket
            Alert ( " Your browser does not support the WebSocket! " );
        }
    }
</script>

4 dwesocket parameters

dwebsocket two decorators: require_websocket and accept_websocekt, using require_websocket decorative function will not result in view of the results in a normal http request received, generally used accept_websocket embodiment can,

dwebsocket some built-in methods:

request.is_websocket (): determining whether the request is websocket way, it returns true, false otherwise

request.websocket (): when the request is websocket time, increases in a websocket attribute request,

WebSocket.wait (): Returns the client sends a message, it will not receive any information leading to obstruction

WebSocket.read () and wait message returned as acceptable, but this is non-blocking, no message return None

WebSocket.count_messages (): Return the number of messages

WebSocket.has_messages (): Returns whether there is new information coming

WebSocket.send (msg): Like the client sends a message, message type byte is