How to understand tornado response request cycle in Django - django

Question

I want to create a real time twitter streaming application using tornado and Django. The problem is I am not able to understand the role of Tornado here, and how will I use view.py models.py of Django in Tornado Web Server.
Below if the request response cycle of Django, could anybody explain to me how the tornado web server will play its role here.
Few questions:
1- What will be role of urls.py file in Django since we will be routing all the urls from Tornado itself.
2- How will I connect to models.py to fetch rows for my tornado application.
I am looking into this github project link

Answer 1

Tornado fits roughly in the "web server" and "wsgi" parts of this diagram, and adds another section for Tornado RequestHandlers attached to the web server. When you create your tornado.web.Application, you will send some URLs to Tornado RequestHandlers and some to the Django WSGIContainer (which will in turn use the Django urls.py).
Using Django models from Tornado code is more challenging; my code from the last time I tried doing this is at https://gist.github.com/bdarnell/654157 (but note that this is quite old and I don't know if it will work any more)

Answer 2

This is tornado_main.py stored in one level with manage.py ... I've tested it with Django 1.8 ...
# coding=utf-8
import os
os.environ.setdefault("DJANGO_SETTINGS_MODULE", "django_project_dir.settings")
import django
django.setup()
from django.core.urlresolvers import reverse_lazy
from django.contrib.auth.models import User
from tornado.options import options, define, parse_command_line
import logging
import tornado.httpserver
import tornado.ioloop
import tornado.web
import tornado.websocket
import tornado.wsgi
define('port', type=int, default=8004)
# tornado.options.options['log_file_prefix'].set(
# '/var/www/myapp/logs/tornado_server.log')
tornado.options.parse_command_line()
class SomeHandler(tornado.websocket.WebSocketHandler):
pass
def main():
logger = logging.getLogger(__name__)
tornado_app = tornado.web.Application(
[
(r'/some_url/(?P<user_id>[0-9]+)', SomeHandler),
],
debug=True
)
logger.info("Tornado server starting...")
server = tornado.httpserver.HTTPServer(tornado_app)
server.listen(options.port)
try:
tornado.ioloop.IOLoop.instance().start()
except KeyboardInterrupt:
tornado.ioloop.IOLoop.instance().stop()
logger.info("Tornado server has stopped")
if __name__ == '__main__':
main()