从Django服务器连接到远程socket.io服务器

Question

I am trying to build a real-time Django application. Because of the way my hosting service works, I am unable to start a Websocket server in parallel of my Django server.

I managed to have user-to-user interactions by creating an express server on a separate NodeJS website with socket.io , and having clients on the Django server also connect to the remote socket.io server.

However, I'dlike to have my Django server directly send events to users. To do this, I would like to create a connection between the Django server and the NodeJS server. Something like that in python:

socket = io("http://socket.io.server")
socket.emit('eventForUsers')

Is there anyway for me to achieve this?

The only information I found seemed to require me to run a parallel server from my Django app, which I can't do because my host doesn't allow me to run long-term processes.

Answer 1

It really depends what is the most simple solution for you, and what are your requirements. (If you want realtime bidirectional messaging then I suggest to use the socket.io-client instead of the POST example)

---

POST (GET,PUT,...)

You can (for example) use POST requests from your Django to Node

Django: python example (there are other ways to perform a POST to Node from Django)

reqParams = {"action":"doThis","data":"put the pizza in the oven"}    
import requests
requests.post('http://ip:port/route', params = reqParams)

Node example : Listens for post at /route (express) and prints the params of the Django request

var express = require('express');
var app = express();

app.post('/route', function (req, res) {
  console.log(req.query); res.end();
});

app.listen(3000, function () {
  console.log('Example app listening on port 3000!');
});

Then you can use the data in req.params to perform action like broadcasting something to the socket.io clients (or a specific client)

This can also be done the other way around, performing requests to send data from Node to Django using POST (GET,...)

---

Socket.io-client in Django

Another (easier) solution is to include the socket.io-client in your Django webapp so it connects to your Node socket.io server as a client when the webapp is opened by browsers.

(using javascript in django)

<script src="/socket.io/socket.io.js"></script>
<script>
  var socket = io('http://ip:port');
  socket.on('connect', function(){alert("Hello World!");});
  socket.on('event', function(data){});
  socket.on('disconnect', function(){});
</script>

More Resources : 1. JavaScript (Django Docs) 2. Including the static files in your template