This is the presentation that I gave on the European On Air tour in Munich. Hence the footy pieces. A lot of the presentation was going through a live application, a port of the addressbook app to App Engine, that lives on Google Code.

1. Google App Engine
Flying into Munich

2. Dion Almaer
twitter.com/dalmaer
almaer.com

6. Don't forget, RIA's have rich
internet back-ends (RIBs?)
Jonathan Schwartz
CEO, Sun Microsystems

7. Google App Engine
Running Web Apps on Google’s Infrastructure
• Fully-integrated
application environment
• Language agnostic runtime
Python for now
• Free quota of 5M
pageviews per month
code.google.com/appengine

8. Google App Engine
Technical Challenges

9. Google App Engine
Financial and Admin Challenges

10. Google App Engine
Easy to use, Easy to scale, Free to start

11. Google App Engine
Free Quota and Expected Pricing
Resource Free Quota Additional
CPU 10-12¢ / core-hour
Storage Equivalent to 5M 15-18¢ / GB-month
pageviews / month
Bandwidth, Outgoing for a typical app 11-13¢ / GB transferred
Bandwidth, Incoming 9-11¢ / GB transferred
11

13. Google App Engine
Free Quota and Expected Pricing
eo rge!
an ks G
Th
Resource Free Quota Additional
CPU 1 euro / core-year
Storage Equivalent to 5M 1 euro / GB-decade
pageviews / month
Bandwidth, Outgoing for a typical app 1 euro / PB transferred
Bandwidth, Incoming 1 euro / PB transferred
13

14. Develop locally. Deploy to Google. Launch.

15. Develop locally. Deploy to Google. Launch.
Deploy

17. Develop locally. Deploy to Google. Launch.

18. Develop locally.
• Google App Engine SDK is open source
• Simulates production environment
•dev_appserver.py myapp
•appcfg.py update myapp

19. Hello World
Simplest output, simplest config
# helloworld.py
print quot;Content-Type: text/htmlquot;
print
print quot;Hello, world!quot;
# app.yaml
application: dalmaer-helloworld
version: 1
runtime: python
api_version: 1
handlers:
- url: /.*
script: helloworld.py

21. loadcontacts
var contacts = [
{ id: 1, name: ‘Dion Almaer’, ... },
{ id: 2, name: ‘Ben Galbraith’, ... },
savecontact ]
name=’Dion A Lamer’
email=’dion@almaer.com’
Web Services

22. threads
sockets
files
foreground
the snake is almost there

23. from django import v0_96 as django

24. Store data
Scalable, and not like a RDBMS
Wow, that's a
big table!

25. • No joins
• Hierarchies
• Indexes

26. Data Model
Just an object
from google.appengine.ext import db
class Story(db.Model):
title = db.StringProperty()
body = db.TextProperty(required=True)
author = db.UserProperty(required=True)
created = db.DateTimeProperty(auto_now_add=True)
rating = db.RatingProperty()
# Many other types: BlobProperty, ReferenceProperty, EmailProperty, PhoneProperty, IMProperty,
PostallAddressProperty, etc.

27. GQL
Our query language
SELECT *
FROM Story
WHERE title = 'App Engine Launch'
AND author = :current_user
AND rating >= 10
ORDER BY rating, created DESC

28. Run the queries
Beyond GQL
Story.gql(GQL_FROM_BEFORE,
current_user = users.get_current_user())
query = Story.all()
query.filter('title =', 'Foo')
.order('-date')
.ancestor(key)

29. Inserts
Manipulating the data
story = Story(
title = 'Morning Glory',
body = '....',
author = users.get_current_user(),
)
story.put() # save or update
story.delete() # delete if saved

30. Call Web Services

31. URL Fetch API
Aint no urllib2
from google.appengine.api import urlfetch
some_feed = urlfetch.fetch('http://somesite.com/rss')
if some_feed.status_code == 200:
self.response.out.write(some_feed.content)
53
421

32. Authenticate to Google
OpenID provider.... available

33. Users API
But you can do your own thing too of course...
from google.appengine.api import users
current_user = users.get_current_user()
if not current_user:
self.redirect(users.create_login_url('/
current_url'))
nickname = current_user.nickname()
email = current_user.email()
if users.is_current_user_admin():
...

34. Send Email

35. Email API
No SMTP config required
from google.appengine.api import mail
def post(self):
email_body = self.request.get('email_body')
sender = users.get_current_user().email
mail.send_mail(sender=sender,
to='marce@google.com',
subject='Wiki Page',
body=email_body)
self.response.out.write('Email Sent')

36. Manipulate Images

37. Image Manipulation API
No SMTP config required
# in model
avatar = db.BlobProperty()
# in handler
avatar = images.resize(self.request.get(quot;imgquot;), 32,
32)
# available
resize
crop
rotate
horizontal_flip
vertical_flip
im_feeling_lucky :)

38. Memcache Support
In-memory distributed cache

39. Memcache API
In-memory distributed cache
from google.appengine.api import memcache
def get_data():
data = memcache.get(quot;keyquot;)
if data is not None:
return data
else:
data = self.query_for_data()
memcache.add(quot;keyquot;, data, 60)
return data
# Set several values, overwriting any existing values for these keys.
memcache.set_multi({ quot;USA_98105quot;: quot;rainingquot;,
quot;USA_94105quot;: quot;foggyquot;,
quot;USA_94043quot;: quot;sunnyquot; },
key_prefix=quot;weather_quot;, time=3600)
# Atomically increment an integer value.
memcache.set(key=quot;counterquot;, 0)
memcache.incr(quot;counterquot;)
memcache.incr(quot;counterquot;)
memcache.incr(quot;counterquot;)

40. Google App Engine
Areas of Work, Including…
• Offline Processing
• Rich Media Support
– e.g., large file upload / download
• Add’l Infrastructure Services
• What would you like to see?
40

41. Use it as you will
No need to go whole hog

42. Your Application
Web Services

44. Google App Engine
Announcing Open Signups

46. Python
Runtime
Web
Configuration
Applications
Static Files URL Fetch API
Google App
Engine
Email API Users API
Memcache API Image API

47. What if popular JavaScript libraries
were available and shared in the browser?
1 Now hosting open source JavaScript libraries at Google
Starting with: Prototype, Script.aculo.us, jQuery, Dojo, Mootools
Accepting requests for other open source libraries
Can access directly:
ajax.googleapis.com/ajax/lib/prototype?v=1.6.0.2&packed=false
Can access via AJAX API Loader:
google.load(“prototype”, “1.6”);
2 Other features
Automatic compression
Minification of libraries
Not tied to Google Code

48. Python
Runtime
Web
Configuration
Applications
Static Files URL Fetch API
Google App
Engine
Email API Users API
Memcache API Image API