Ruby And The Cloud

How to deploy Ruby Sinatra applications to the Heroku and Google AppEngine cloud platforms Ruby and the Cloud Chang Sau Sheong Geekcamp SG 22 Aug 2009

Beginner/Intermediate

What I am going to show here
Use Sinatra to write a TinyURL clone (Snip)
Deploy Snip to Heroku
Deploy Snip to Google AppEngine
Disclaimer – No affiliation with Heroku or Google, all opinions are my own

Clone TinyURL in 40 lines of Ruby code

URL Shorteners
First successful one was TinyURL, started in 2002
Generate a short URL for any URL, going to short URL will redirect to the original
Usage exploded with popularity of Twitter
Biggest market share today – TinyURL, used to be default for Twitter, second is bit.ly
Twitter switched to bit.ly early May 2009

Sinatra
Rack-based minimalist Ruby web application framework
require ‘rubygems’ require ‘sinatra’ get ‘/hi’ do “ Hello Geekcamp!” end
Designed and developed by Blake Mizerany, financial support by Heroku

http://github.com/sausheong/snip

Some notes
Base 36 conversion to reduce number of characters used
Ruby provides conversion with to_i and to_s
DataMapper
ActiveRecord, Sequel also supported
Use DATABASE_URL environment variable
Embedded view template with use_in_file_templates!

QUESTIONS? (BEFORE CONTINUING)

Deploying Sinatra apps to Heroku

Ruby cloud platform
Hosted on Amazon’s Elastic Compute Cloud (EC2)
Fully managed, developer only needs to deploy, all else taken care of
Full set of command line tools to manage deployment
Deploy to your own domain or *.heroku.com

Architecture Nginx Varnish Custom made from Erlang Your code runs here Postgres Memcached

Inside each dyno Debian MRI Rails, Sinatra etc Thin

6 steps to deploy
Install Heroku gem
Create a Rackup file (config.ru)

6 steps to deploy
Create empty git repository, add all files and commit the files

6 steps to deploy
Create the Heroku application using the Heroku gem

6 steps to deploy
Push code to git repository

6 steps to deploy
Go into the Heroku console to create the database
Done!

QUESTIONS? (BEFORE CONTINUING)

Deploying Sinatra apps to Google AppEngine with JRuby

Lets you run your web applications on Google's infrastructure
Fully managed, only deploy and runs
Can use own domain name or *.appspot.com
First released April 2008, first language used Python
April 2009, Java support released
Google App Engine

App Engine for Java
Java 6 virtual machine (JVM), App Engine SDK supports Java 5 and later
Servlet classes, JSPs, static files and data files, deployment descriptor (web.xml), configuration files, in a standard WAR directory structure (not WAR file)
Persistence using DataStore with JDO and JPA
Caching using App Engine’s memcache with JCache
Use Mail service with JavaMail
Image service, Google Accounts for authentication

JRuby is the Java implementation of the Ruby programming language
Tightly integrated with Java, able to call Java classes, Ruby 1.8.6 compatible
Is what we’re going to use to deploy Snip to App Engine

First, some code differences http://github.com/sausheong/snip-appengine No base 36 conversion Using Ola Bini’s Bumble DataStore adapter, Using DataStore key instead of id

What we need to deploy
JRuby 1.3 RC1 (at least)
Need to split into 2 files because of App Engine’s 10MB file size limit
Google App Engine for Java SDK
Warbler – the JRuby WAR packager
Includes JRuby-Rack

Steps to deploy
Install necessary gems (remember to use JRuby and not C Ruby)
Create a config directory and create the Warbler configuration

Steps to deploy
Replace it with this file
This is important – your app name We can’t use the default full JRuby library it is too large for GAE/J – max 10MB

Steps to deploy
Create a lib folder and add the following library files:
App Engine Java library - appengine-api-1.0-sdk-1.2.0.jar
Split jruby-complete-1.3.0RC1.jar to:
jruby-core-1.3.0RC1.jar and
jruby-stdlib-1.3.0RC1.jar
(JRuby-Rack will be added by Warbler later)
Create an appengine-web.xml deployment configuration file

Steps to deploy Remember this? Your app name before You might want to do this for debugging

Steps to deploy
Create a Rackup configuration file config.ru
Preparation complete!

Steps to deploy
Generate the war file and directory using Warble

Steps to deploy
Output:

Steps to deploy
Go into Sinatra code at tmp/war/WEB-INF/gems/gems/sinatra-0.9.1.1/lib/sinatra.rb and remove use_in_file_templates!

Steps to deploy
Deploy to App Engine!

Steps to deploy

QUESTIONS?

http://tinyclone.saush.com

[email_address] http://blog.saush.com http://github.com/sausheong

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Ruby And The Cloud

by Sau Sheong Chang

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