client.py

"""
WebSocket Client for Growl Notification

Requirements:
- websocket-client:
    https://github.com/liris/websocket-client
- Growl:
    http://growl.info/documentation/developer/python-support.php
"""

import websocket
import json
import Growl
import urllib2

class MyGrowl:
    @classmethod
    def get_growl(cls):
        if not hasattr(cls, "g"):
            cls.g = Growl.GrowlNotifier(applicationName="BalibaliNotifier",
                                        notifications=["Notify"])
            cls.g.register()
        return cls.g

    @classmethod
    def notify(cls, title, description, image_url="", sticky=False):
        g = cls.get_growl()
        g.notify(noteType="Notify",
                 title=title,
                 description=description,
                 icon=cls.get_image(image_url),
                 sticky=sticky)

    @staticmethod
    def get_image(url):
        if url:
            return Growl.Image.imageWithData(urllib2.urlopen(url).read())

def on_message(ws, message):
    MyGrowl.notify(**json.loads(message))

if __name__ == "__main__":
    # websocket.enableTrace(True)
    ws = websocket.WebSocketApp("ws://localhost:3000/", on_message=on_message)
    ws.run_forever()

notify.js

var ws = require("websocket-server");

var server;

var express = require("express");
var app = express.createServer();
app.get("/", function(req, res) {
  if (req.query.description) {
    server.broadcast(JSON.stringify({
      "title":       req.query.title,
      "description": req.query.description,
      "image_url":   req.query.image_url,
      "sticky":      req.query.sticky
    }));

    res.send("notified");
  } else {
    res.send("description not found");
  }
});

server = ws.createServer({server: app, debug: true});
server.listen(3000);