Slides for Lightining talk that I gave in PyCon Finland in Turku on 21.10.2010

1. quick’n’dirty
TORNADO intro
Teemu Kurppa
www.dirtyaura.org/blog
Twitter: teemu
Huikea Experience
Social mobile gaming startup
www.huikea.com

3. TORNADO
scalable, non-blocking web server

4. TORNADO
asynchronous requests
simple clean DB API, no ORM
programmer-friendly templates
readable codebase
proven in production: FriendFeed

5. TORNADO
Probably good for
real-time web services (hanging GETs to poll)
super-popular dynamic sites
non-web REST services
non-CMS sites
for devs like me

6. Our Tornado instance
app
cheap, async call
Twitter

7. Our Tornado instance
db.slow_synchronous_query()
cheap, async call
?
Twitter

8. Our Tornado instance
cheap, async calls
Another Tornado instance
Twitter
db.slow_synchronous_query()

9. Programmer-friendly templates
{% for index,value in entries.iteritems() %}
{{ index }} : {{ value }
{% end %}
{% for value in entries %}
{{ forloop.counter0 }} : {{ value }}
{% endfor %}

10. CODE DEMO

11. class TwitterBadgeHandler(tornado.web.RequestHandler):
@tornado.web.asynchronous
def get(self, username):
http = tornado.httpclient.AsyncHTTPClient()
url = "http://api.twitter.com/1/users/show/%s.json" % username
http.fetch(url, callback=self.on_response)
def on_response(self, response):
if response.error:
self.render("badge_error.html")
else:
user = tornado.escape.json_decode(response.body)
self.render("twitter_badge.html", **user)

12. ....
<style type="text/css">
.badge {
background: #{{profile_background_color}} url({{profile_background_image_url}});
... rest of wrapping and css left-out ...
<div class="badge">
<img class="badge-photo” src="{{ profile_image_url }}">
<div class="badge-title">{{ screen_name }}</div>
<div class="badge-description">{{ description }}</div>
<div class="clear"></div>
<div class="badge-status">{{ status['text'] }}</div>
</div>