Contents. Chapter 1: Google App Engine...1 What Is Google App Engine?...1 Google App Engine and Cloud Computing...2

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1 Contents Chapter 1: Google App Engine...1 What Is Google App Engine?...1 Google App Engine and Cloud Computing...2 End User Applications on the Cloud... 2 Services on the Cloud... 2 Google App Engine and the Cloud... 3 Before You Start Using App Engine...3 Setting Up Your Development Environment...4 Hello, World!...6 Summary...8 Chapter 2: Exploring the SDK...11 Creating Your First Complete Project...11 The webapp Framework Using the Sandboxed Python Runtime...15 Putting the Application Together...17 Using Templates vs. Inline HTML Deciding How Many Event Handlers...20 Debugging the Application...21 Debugging Options for the Development Web Server Debugging a WSGIApplication Implementing a Debugging Aid Developing with Google App Engine i

2 Interactive Debugging Publishing to the Web...27 Creating and Registering an Application Uploading an Application Running an Application from a Custom Domain Summary...32 Chapter 3: The Design of a Google App Engine Application...33 The BookmarksBin Application...33 The Data Model...33 Wait, No User Table? Web Application Architecture...35 Pages-to-Components Mapping Summary...39 Chapter 4: Building an Application...41 Working with the webapp Framework...41 Working With Other Frameworks...43 Laying Out Applications with webapp Templates...44 Exploring the Template Hierarchy Assembling the Templates and Handlers Using Static Files...51 Displaying a Favicon Beautifying Your User Interface with CSS Downloading the Source Files for the Examples Summary...56 ii Developing with Google App Engine

3 Chapter 5: What About the Users?...57 Authentication and Google Accounts...58 Using GData Services User Objects...60 What About Specific Domains? Getting a Valid User Object and the Users API Other Users API Functions User Objects in the Datastore...65 Configuring Admin Users...68 Defining Admin Users Validating Admin Users in the Code Summary...72 Chapter 6: Using the Datastore...73 Bigtable and the Datastore...73 The Datastore API...75 Entities and Unique Identifiers Disallowed Property Names Entity Groups and Transactions Implementing Persistence for the BookmarksBin Application...79 Persisting and Querying an Entity Deciding Which Calls to the Datastore Are Necessary Associating and Manipulating Entities...87 One-to-Many Relationships Choosing Between Query and GqlQuery The Google Query Language...93 Specifying Conditional Clauses Developing with Google App Engine iii

4 Indexing Entities in the Datastore...95 Automatic Indexing and Queries Defining Indexes Manually Indexes That Are Not Created by App Engine Restrictions on Queries Committing Data in Transactions Reasons for Using Transactions Using the Transaction API Many-to-Many Relationships Storing and Deleting Entities Summary Chapter 7: Memcache and Session Data What Is Memcache? Using Memcache for Session Data Caching the Session Owner Implementing Memcache Calls with Entities Defining Unique Key Names Using Memcache Services Throughout an Application Caching Data from Complex Queries Invalidating the Cache Other Memcache Functions Summary Chapter 8: Mail, URL Fetching, and Image Manipulation Sending Configuring dev_appserver.py Configuring the App Engine to Send Mail Sending From an Application Using Templates iv Developing with Google App Engine

5 Using the Fetch URL API Calling a Web Service Fetching a Resource from Another Site Manipulating Images Required for Development: The Python Imaging Library (PIL) Using the Images API Summary Chapter 9: Managing the Application Managing Applications Accessing the Application Management Console Restrictions on Creating an Application Changing the Application Configuration Using the Application Administration Logs The Dashboard The Runtime Logs Offline Log Analysis Logs and Application Quotas Viewing Active Indexes Viewing and Manipulating Datastore Objects Using the Development Console Summary Related Titles Copyright Developing with Google App Engine v

6 Developing with Google App Engine by Eugene Ciurana Large scale, high availability application development was a dark art until the release of Google App Engine. It involved balancing (and sometimes pitting) the programmers skills against the application requirements and the underlying infrastructure. Google App Engine frees us, the developers, from most concerns about the infrastructure so that we can focus on coding and delivering useful software. It empowers us to develop complex applications with a simple and elegant API, using robust programming tools like Python, and leveraging the sophisticated data storage, searching and caching technologies that helped Google to succeed. This is cloud computing made easy and it enables us to create high availability Software as a Service without excessive overhead or infrastructure worries. This book is about how to design, build, deploy, and manage Google App Engine applications efficiently. This work would not have been possible without the support from Apress, the Google App Engine team, and the members of various IRC groups. My special thanks go to Richard Ables, Richard L. Burton III, Guillermo Castro, Charles Kolya Colt, Johan Edstrom, Jason Essington, Aaron Gallagher, Bennett Hiles, Nick Heudecker, Devin Jeanpierre, Shane Jonson, Heather Lang, Justin Lee, Joe Littlefeatherstein, Andrew Lombardi, Marzia Niccolai, Joseph Ottinger, Jeffrey Pepper, Pranav Prakash, Sverre Rabbelier, Tracy Snell, Craig Tataryn, Nestor Toro, Jason Whaley, and Grace Wong. Thanks to the denizens of the #appengine and #python IRC channels from Freenode.net, who always replied to my endless Python-specific questions without losing their patience. Developing with Google App Engine está dedicado a Cary Macías con mucho cariño. Gracias Jefa! vi Developing with Google App Engine

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