Download as PDF, PPTX
![main.py: Adding a handler
from google.appengine.ext import webapp
from google.appengine.ext.webapp.util import run_wsgi_app
class MainHandler(webapp.RequestHandler):
def get(self):
self.response.out.write('<h1>Hello world!</h1>')
self.response.out.write('''
<form action="/sign" method=post>
<input type=text name=content>
<br><input type=submit value="Sign Guestbook">
</form>
''')
class GuestBook(webapp.RequestHandler):
def post(self):
self.response.out.write(
'<h2>You wrote:</h2> %s' % self.request.get('content')
)
application = webapp.WSGIApplication([
('/', MainHandler),
('/sign', GuestBook),
], debug=True)
# start_wsgi_app etc ...](https://image.slidesharecdn.com/osconwhatisappengine-100721122626-phpapp02/85/What-is-App-Engine-O-38-320.jpg)
![main.py: Skeleton application
from google.appengine.ext import webapp
from google.appengine.ext.webapp import util
class MainHandler(webapp.RequestHandler):
def get(self):
self.response.out.write('Hello world!')
def main():
application = webapp.WSGIApplication([('/', MainHandler)],
debug=True)
util.run_wsgi_app(application)
if __name__ == '__main__':
main()](https://image.slidesharecdn.com/osconwhatisappengine-100721122626-phpapp02/85/What-is-App-Engine-O-50-320.jpg)
What is App Engine? O
- 1. What is AppEngine? Ikai Lan OSCON July 21st, 2010 Twitter: @ikai
- 2. Agenda Topics we'll cover Why App Engine? Traditional web stack scalability App Engine to the rescue! Services and APIs Deployment steps App Engine and Open Source Questions and Next Steps
- 3. What is GoogleApp Engine?
- 4. Google App Engineis... ... a way for you to run your web applications on Google’s scalable infrastructure. Google’s Data Centers
- 5. Start with... thebasic LAMP stack LAMP: Linux Apache MySql Programming Language (PHP, Python, Perl, etc.) NOT Scalable Single Point of Failure (SPOF) Google Confidential and Proprietary
- 6. Database on aseparate server Still not Scalable! TWO Single Points of Failure Google Confidential and Proprietary
- 7. Multiple Web Servers Now you need Load Balancing Database is still Single Point of Failure Google Confidential and Proprietary
- 8. Round Robin LoadBalancing Register list of IPs with DNS DNS record is cached with a Time to Live (TTL) Google Confidential and Proprietary
- 9. Round Robin LoadBalancing But the TTL takes time to propagate and might not be respected So if a machine goes down... :-( And the database is still SPOF Google Confidential and Proprietary
- 10. Master Slave Database :-)Better read throughput :-( Master is SPOF for writes :-( Master may die before replication Google Confidential and Proprietary
- 11. Partitioned Database :-) BetterR/W throughput :-( More machines, more management :-( Re-architect data model :-( Rewrite queries Google Confidential and Proprietary
- 12. Why build itall yourself? Google Confidential and Proprietary
- 13. Why not useGoogle App Engine? Simple application configuration No systems administration No performance tuning AUTOMATIC SCALING! Google Confidential and Proprietary
- 14. The Cloud ComputingLandscape SaaS PaaS IaaS Source: Gartner AADI Summit Dec 2009
- 15. App Engine Developers/Apps Google Confidential and Proprietary
- 16. Google Confidential andProprietary
- 17. By the numbers Over 100,000 applications 250,000 developers Over 250 million daily pageviews
- 18.
- 19. App Engine Components Load balancing Routing Hosts static content Separate from programming files Google Confidential and Proprietary
- 20. App Engine Components Hosts application code Handles concurrent requests Enforces isolation for app safety Maintains statelessness Multiple Runtimes Copyright © Sun Microsystems Inc. All rights reserved. Google Confidential and Proprietary
- 21.
- 22. Bigtable - TheApp Engine datastore Distributed, partitioned datastore Arbitrary horizontal scaling - scales to “Internet scale” Replicated and fault tolerant Parallel processing Predictable query performance No deadlocks Google Confidential and Proprietary
- 23. Memcache Distributed, very fast, in-memory cache Optimistic caching Very stable, robust and specialized Google Confidential and Proprietary
- 24. URL Fetch Simple, HTTP communication HTTP GET/POST to external service Allows integration with third-party REST APIs Google Confidential and Proprietary
- 25. Mail Inbound and outbound mail Outbound mail Inbound mail handling Attachment processing Google Confidential and Proprietary
- 26. XMPP Instant messaging for your application Incoming and outgoing XMPP No need to worry about setting up servers Google Confidential and Proprietary
- 27. Task Queue Background and scheduled computation Background processing infrastructure Scheduled jobs Automatic handling of queuing and job polling Google Confidential and Proprietary
- 28. Images Image manipulation Resize Crop Image compositions Google Confidential and Proprietary
- 29. Blobstore Heavy lifting for large files Upload and distribute large files Programmatic access to file contents Google Confidential and Proprietary
- 30. User Accounts Federated login for your application Google Accounts or OpenID Administrator management No need to create user management system Google Confidential and Proprietary
- 31.
- 32. Getting started withApp Engine Download the SDK http://code.google.com/appengine Register for an Appspot account https://appengine.google.com Write code - deploy!
- 33. Starting a project Linux, MacOS, etc. command-line: $ dev_appserver.py helloworld # run dev svr $ appcfg.py update helloworld # deploy live Windows GUI (also avail for Mac):
- 34. Project contents app.yaml – main configuration file index.yaml – automatically generated to index your data main.py – your main application "controller" code goes here
- 35.
- 36. Local development server $ dev_appserver.py helloworld (Can also use the launcher for Windows and OS X)
- 37. Deploying the application Set application identifier Run deploy script You're live!
- 38. main.py: Adding ahandler from google.appengine.ext import webapp from google.appengine.ext.webapp.util import run_wsgi_app class MainHandler(webapp.RequestHandler): def get(self): self.response.out.write('<h1>Hello world!</h1>') self.response.out.write(''' <form action="/sign" method=post> <input type=text name=content> <br><input type=submit value="Sign Guestbook"> </form> ''') class GuestBook(webapp.RequestHandler): def post(self): self.response.out.write( '<h2>You wrote:</h2> %s' % self.request.get('content') ) application = webapp.WSGIApplication([ ('/', MainHandler), ('/sign', GuestBook), ], debug=True) # start_wsgi_app etc ...
- 39. main.py: Persisting tothe datastore class GuestBook(webapp.RequestHandler): def post(self): greeting = Greeting() greeting.content = self.request.get('content') greeting.put() self.redirect('/')
- 40. main.py: Collecting valuesfrom the datastore class MainHandler(webapp.RequestHandler): def get(self): self.response.out.write('Hello world!') self.response.out.write('<h1>My GuestBook</h1><ol>') greetings = Greeting.all() for greeting in greetings: self.response.out.write('<li> %s' % greeting.content) self.response.out.write(''' </ol><hr> <form action="/sign" method=post> <textarea name=content rows=3 cols=60></textarea> <br><input type=submit value="Sign Guestbook"> </form> ''')
- 41. Running the deployscript $ appcfg.py update helloworld Scanning files on local disk. Initiating update. Email: ...
- 42.
- 43. Google App Engineand Open Source
- 44. TyphoonAE: Open Sourceimplementation
- 45. Open Source JVMlanguage runtimes Clojure Practical Lisp on the JVM JRuby/Mirah Ruby on the JVM. Mirah = Ruby-like language that compiles to Java (speed!) Groovy Dynamically typed Java-like language Scala Strongly typed, functional imperative Jython Java implementation of Python
- 46. Open Source PersistenceFrameworks Objectify http://code.google.com/p/objectify-appengine/ Twig http://code.google.com/p/twig-persist/ Slim3 (popular in Japan) http://sites.google.com/site/slim3appengine/ SimpleDS http://code.google.com/p/simpleds/ Django-nonrel http://www.allbuttonspressed.com/projects/django- nonrel
- 47. Official features DatanucleusJDO/JPA http://code.google.com/p/datanucleus-appengine/ App Engine Map/Reduce http://code.google.com/p/appengine-mapreduce/ Python SDK Java SDK - soon!
- 48. Questions and NextSteps
- 49.
- 50. main.py: Skeleton application fromgoogle.appengine.ext import webapp from google.appengine.ext.webapp import util class MainHandler(webapp.RequestHandler): def get(self): self.response.out.write('Hello world!') def main(): application = webapp.WSGIApplication([('/', MainHandler)], debug=True) util.run_wsgi_app(application) if __name__ == '__main__': main()
- 51. Next steps Downloadthe SDK http://code.google.com/appengine Do the codelab http://code.google.com/appengine Register for an Appspot account https://appengine.google.com Get this presentation http://slideshare.net/ikailan