connecting python to javascript for two-direction communication

Question

I would like to serve queries from a javascript code by python. But I am not experienced in this field at all. What I would like to build is something like this:

Answer 1

What you need is a socket server on the python end and a client/request server on the javascript end.

For the python server side, refer to SocketServer, (example taken from there as well), one thing you have to make sure is to have the socket go past NAT (possibly port forwarding). One other alternative is Twisted which is a very powerful framework, i believe it has functionality to send data through NAT.

import SocketServer

class MyTCPHandler(SocketServer.BaseRequestHandler):
    """
    The RequestHandler class for our server.

    It is instantiated once per connection to the server, and must
    override the handle() method to implement communication to the
    client.
    """

    def handle(self):
        # self.request is the TCP socket connected to the client
        self.data = self.request.recv(1024).strip()
        print "{} wrote:".format(self.client_address[0])
        print self.data
        # just send back the same data, but upper-cased
        self.request.sendall(self.data.upper())

if __name__ == "__main__":
    HOST, PORT = "localhost", 9999

    # Create the server, binding to localhost on port 9999
    server = SocketServer.TCPServer((HOST, PORT), MyTCPHandler)

    # Activate the server; this will keep running until you
    # interrupt the program with Ctrl-C
    server.serve_forever()

On the JavaScript there are many frameworks that allow socket connections, here are a few

• Socket IO

Example:

• You can even use HTML5 Web Sockets

Example:

var connection = new WebSocket('ws://IPAddress:Port');
connection.onopen = function () {
  connection.send('Ping'); // Send the message 'Ping' to the server
};

• Also, take a look at a part of this book , Chapter 22 of Javascript: The Definitive Guide , https://www.inkling.com/read/javascript-definitive-guide-david-flanagan-6th/chapter-22/web-sockets

• Finally, take a look at jssockets

Example:

_jssocket.setCallBack(event, callback);
_jssocket.connect(ip,port);
_jssocket.write(message);
_jssocket.disconnect();

Hope this help!