如何让这个websocket示例与Flask一起使用?

时间:2013-11-11 05:39:06

标签: javascript python websocket flask flask-sockets

我正在尝试使用Kenneth reitz's Flask-Sockets库来编写一个简单的websocket接口/服务器。这是我到目前为止所拥有的。

from flask import Flask
from flask_sockets import Sockets

app = Flask(__name__)
sockets = Sockets(app)

@sockets.route('/echo')
def echo_socket(ws):

    while True:
        message = ws.receive()
        ws.send(message)


@app.route('/')
def hello():
    return \
'''
<html>

    <head>
        <title>Admin</title>

        <script type="text/javascript">
            var ws = new WebSocket("ws://" + location.host + "/echo");
            ws.onmessage = function(evt){ 
                    var received_msg = evt.data;
                    alert(received_msg);
            };

            ws.onopen = function(){
                ws.send("hello john");
            };
        </script>

    </head>

    <body>
        <p>hello world</p>
    </body>

</html>
'''

if __name__ == "__main__":

    app.run(debug=True)

我期待发生的是当我进入默认的烧瓶页面{I} http://localhost:5000时,我会看到一个包含文本hello john的警告框,但是我得到了一个Firefox错误。错误是Firefox can't establish a connection to the server at ws://localhost:5000/echo。如何通过向Web服务器发送消息然后回显回复来使警告框中显示hello john

1 个答案:

答案 0 :(得分:6)

使用gevent-websocket(参见gevent-websocket usage):

if __name__ == "__main__":
    from gevent import pywsgi
    from geventwebsocket.handler import WebSocketHandler
    server = pywsgi.WSGIServer(('', 5000), app, handler_class=WebSocketHandler)
    server.serve_forever()

或者使用gunicorn运行服务器(参见Flask-Sockets Deployment):

gunicorn -k flask_sockets.worker module_name:app