Living in the Cloud: Hosting Data & Apps Using the Google Infrastructure

Living In The Cloud
Hosting Data & Apps Using The Google Infrastructure

Introductions
Pamela Fox USC/Google
http://www.wordle.net/gallery/wrdl/710650/fkedupmonkey_tags

The Cloud!

Tonight’s Agenda
Google Data APIs
App Engine

Before the Cloud: Web Apps

After the Cloud: Web Apps

Viral Spread + User Edits = Scaling Nightmare
Mo’ Users, Mo’ Problems

Old Architecture code/data

Old Architecture

Solution: App Engine

What Is App Engine?
Lets you run your web application on top of Google’s infrastructure.
Servers
Network
Datastore
Backups
Pagers
“ We wear pagers so you don’t have to.” — Guido van Rossum Scalable }

App Engine Architecture code data

Simple, Automatic Scaling

App Engine Components code data

Python

Data Store

Data Store db.GqlQuery("SELECT * FROM Shout " "WHERE who >= 'b ' AND who < ' c ' " "ORDER BY when DESC").fetch(100) query = Shout.all() query.order('-date') query.filter('who >=', 'b') query.filter('who <', ‘c') shouts = query.fetch(100)

Memcache

Users @gmail.com @myappsdomain.com

Demo
Google App Engine

Before the Cloud: User Apps

After the Cloud: User Apps

Users demand ownership of their content.
Other sites want to access that content.
Damn Needy Users

Solution: Google data APIs

How Do You Make Things Accessible?
An application programming interface (API) is a set of functions, procedures, methods or classes that an operating system , library or service provides to support requests made by computer programs .
Source: Wikipedia
A pplication P rogramming I nterface ( )

APIs
RPC || REST
* SOAP

Remote Procedure Calls fooInstance->addNumbers(2, 3); <?xml version="1.0"?><methodCall> <methodName>Foo.addNumbers</methodName> <params> <param> <value><int>2</int></value> <value><int>3</int></value> </param> </params></methodCall> fooInstance.addNumbers(2, 3); PHP XML (Network) C++

REST [Fielding 2000] Re presentational S tate T ransfer ( )

REST
Fundamentals of REST:
Application state and functionality is abstracted into discrete resources .

REST
Resources are accessible via URLs . /blog/posts/1234

REST
Resources share a uniform interface for transferring state . HTTP:// } GET POST PUT DELETE

RSS/ATOM Feed { Entries Example RSS feed.

ATOMPub Feed { Entries GET POST PUT DELETE

Google data APIs Protocol Feed Query { Entries GET POST PUT DELETE

The Google Data Protocol REST Google Data Protocol RSS 2.0 Architecture Syndication Updates AtomPub Atom

The Google Data Protocol RSS 2.0 Atom(Pub) Google Data Syndication Format ✓ ✓ ✓ Queries ✓ Updates ✓ ✓ Optimistic Concurrency ✓ Authentication ✓

The Google Data Protocol Over 15 APIs, 1 Protocol Many Uses

Case Study: CalGoo

The Google Data Protocol
GET /myFeed
200 OK
<?xml version="1.0"?>
<feed xmlns=" http://www.w3.org/2005/Atom ">
<title>Foo</title>
<updated>2006-01-23T16:25:00-08:00</updated>
<id> http://www.example.com/myFeed </id>
<author>
<name>Jo March</name>
</author>
<link href="/myFeed" rel="self"/>
</feed>
Requesting a feed or resource

POST /myFeed
<entry xmlns=" http://www.w3.org/2005/Atom ">
<author>
<name>Elizabeth Bennet</name>
<email> [email_address] </email>
</author>
<title type="text">Entry 1</title>
<content type="text">This is my entry</content>
</entry>
Creating a new resource

201 CREATED
<id> http://www.example.com/id/1 </id>
<link rel="edit" href=" http://example.com/myFeed/1/1/ "/>
<author>
</author>
</entry>
Creating a new resource

PUT /myFeed/1/1/
<author>
</author>
<content type="text">This is my first entry.</content>
</entry>
Updating an entry

200 OK
<author>
</author>
<content type="text">This is my first entry.</content>
</entry>
Updating an entry

DELETE /myFeed/1/2/
200 OK
Updating an entry

Demo
Google Data CRUD

GET /myFeed?q=This
200 OK
<feed xmlns=" http://www.w3.org/2005/Atom ">
<title>Foo</title>
<id> http://www.example.com/myFeed </id>
<link href="/myFeed" rel="self"/>
<entry>
</entry>
</feed>
Searching for a resource

Demo
Youtube Searcher

JSON and RSS
Other formats are also supported:
?alt=json ?alt=json-in-script ?alt=kml ?alt=rss

Client Libraries
PHP
.NET Java JavaScript Objective-C Python + Community Contributed

Demo
Google Data Sample Applications

My Secret Motivation For Giving This Talk
Google Data APIs
♥
App Engine

Demo
Google Data APIs + App Engine

Conclusion
Google Data APIs
App Engine Scalable Architecture (AtomPub) APIs

Questions? Pamela Fox [email_address] @pamelafox More Info http://code.google.com ↶

Living in the Cloud: Hosting Data & Apps Using the Google Infrastructure

by Pamela Fox

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Living in the Cloud: Hosting Data & Apps Using the Google Infrastructure Presentation Transcript