Nginx+uWSIG+Django+websocket的实现

1.Django+websocket

django-websocket
dwebsocket
django-websocket是旧版的，现在已经没有人维护，dwebsocket是新版的，推荐使用dwebsocket。

python manage.py runserver --port 8000

用这两个库，django用以上的命令启动的时候，可以正常建立websocket连接的
但是如果django用uwsgi启动，会报错：handshake的时候返回400，即客服端不合法
dwebsocket的README.md里面写着可以通过下面的修改来实现从uwsgi启动
1.在settings.py增加WEBSOCKET_FACTORY_CLASS变量
2.修改uwsgi的启动命令为：

uwsgi --http :8000 --http-websockets --processes 1  --wsgi-file django_wsgi.py --async 30 --ugreen --http-timeout 300

但是我试过之后失败了

2.Django+uwsgi+websocket

后面我发现uwsgi2.0已经提供了对websocket的支持
uwsgi文档
DEMO:

def echo_once(request):
    import uwsgi
    uwsgi.websocket_handshake()   #与客户端建立连接 ，在uwsgi2.0中，这个函数不需要参数
    while True:
        msg = uwsgi.websocket_recv()  #阻塞，等待客户端发来的消息
        uwsgi.websocket_send(msg)     #发送消息到客服端

所有的API：
uwsgi.websocket_handshake([key, origin, proto])
uwsgi.websocket_recv()
uwsgi.websocket_send(msg)
uwsgi.websocket_send_binary(msg) (added in 1.9.21 to support binary messages)
uwsgi.websocket_recv_nb()
uwsgi.websocket_send_from_sharedarea(id, pos) (added in 1.9.21, allows sending directly from a SharedArea – share memory pages between uWSGI components)
uwsgi.websocket_send_binary_from_sharedarea(id, pos) (added in 1.9.21, allows sending directly from a SharedArea – share memory pages between uWSGI components)

3.nginx的配置：

            location / {
                    uwsgi_pass 127.0.0.1:8000;
                    include  uwsgi_params;
                    proxy_http_version 1.1;
                    proxy_set_header Upgrade $http_upgrade;
                    proxy_set_header Connection "upgrade";
            }

在nginx的server中加入proxy开头的三行配置

4.调试用的python websocket客户端

from websocket import create_connection
ws = create_connection("ws://192.168.000.000:8000/echo_once") 
print "Sending 'Hello, World'..."
ws.send("Hello, World")
print "Sent"
print "Reeiving..."
result = ws.recv()
print "Received '%s'" % result
ws.close()