Tornado

Real Time Web Server

Real Time, so what?
Tornado – The baby that comes with it
1000s simultaneously active connections

Open-source (Apache 2.0 License)
Nginx
Non-blocking web server
Epoll (callbacks on the kernel file structure)
Push vs Pull (long polling)
Real-time web services

- Module List

- Code Snippets
URL Mapping (get + post)
class MainHandler(tornado.web.RequestHandler):
def get(self):
self.write("You requested the main page")
class StoryHandler(tornado.web.RequestHandler):
def get(self, story_id):
self.write("You requested the story " + story_id)
application = tornado.web.Application([ (r"/", MainHandler), (r"/story/([0-9]+)", StoryHandler), ])
Post arguments
def get(self):
self.write('<html><body><form action="/" method="post">'
'<input type="text" name="message">'
'<input type="submit" value="Submit">'
'</form></body></html>')
def post(self):
self.set_header("Content-Type", "text/plain")
self.write("You wrote " + self.get_argument("message"))
HTTPRequest

- Code Snippets
HTML Templates
<html>
<head>
<title>{{ title }}</title>
</head>
<body>
<ul>
{% for item in items %}
<li>{{ escape(item) }}</li>
{% end %}
</ul>
</body>
</html>
Template Handler
def get(self):
Items = ["Item 1", "Item 2", "Item 3"]
self.render("template.html", title="My title", items=items)

- UI Modules
Widget
HTML, CSS
JavaScript
MySQL
Blog Post 1
Widget
myModule.py
Blog Post 2
Widget
Web Page
<short python code here…>

- Asynchronous Requests
1. Fetch data
www.website.com
Picasa/Flickr
2. Response (callback)
Synchronous Requests
immediate server response
cannot later-update the client
Asynchronous Requests
immediate server response
allows for 3rd party services
push technologies

- References
Non-blocking
Long-polling
Web Server
CSRF Protection
Asynchronous
Signed Cookies
modular
Tornado - http://www.tornadoweb.org/
Epoll man page - http://linux.die.net/man/4/epoll
Long Pooling - http://en.wikipedia.org/wiki/Push_technology
CSRF - http://en.wikipedia.org/wiki/Cross-site_request_forgery
Hack it now…
Q/A minute

Cristian Andreica
331 CB
cristian.andreica@gmail.com
: @acristian
http://www.slideshare.net/cristianAndreica/tornado
Thank YOU!

Tornado

by Cristian Andreica on May 17, 2010

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Tornado — Presentation Transcript