Continuous Integration
For Rails Project
IN-SRC Studio
Louie Zhao

Continuous Integration
• A software development practice
where members of a team integrate
their work frequently
• Each integration is verified by an
automated build (including test)
• significantly reduced integration
problems

Firefox Tinderbox
http://tinderbox.mozilla.org/showbuilds.cgi?tree=Firefox

Continuous Integration
• Maintain a code repository
• Automate the build
• Every commit should be built
• Make the build self-testing
• Keep the build fast
• Everyone can see the results

CI Solutions for Rails
• CruiseControl.rb http://cruisecontrolrb.thoughtworks.com/
• Cerberus http://cerberus.rubyforge.org/
• Run Code Run http://runcoderun.com/
• Integrity http://integrityapp.com/

Integrity
• light-weighted
• easy to configure
• good support for git
• works on our own install.

Integrity
Production
developer Git Push
git
Build Notification
developer repository
developer
developer CI Server
Email Notification

Integrity - Installation
• Server Configuration
• SUSE Linux
• Apache
• Passenger
• MySQL 5.x

Integrity - Build
• The building environment is almost
identical to your development
environment
• Standalone CI server
• DB Server
• rake ci WITH_PACKAGE_TEST=1

Integrity - Installation
http://www.in-src.com/continuous_integration_for_rails_project
• $ gem install --passenger integrity
• $ integrity install [integrity-diretory]
• $ integrity migrate_db config.yml

Integrity - Source
• local git repository
• /var/git/[project-name].git
• remote git repository
• ssh://[user]@[hostname]/var/git/[project-name].git

Integrity - Git Hook Up
• git post-receive
• POST_RECEIVE_URL
• Daemons

Integrity - Email
Notification

Integrity - Build

Integrity - Build

Integrity - Build

Integrity
• Trouble Shooting
• http://www.in-src.com/
continuous_integration_for_rails_project

Metric Fu
• a set of rake tasks
• Saikuro, Flog, Flay, Rcov, Reek, Roodi
• sudo gem install jscruggs-metric_fu
• rake metrics:all
• generate metrics reports

Metric Fu - Configuration

Metric Fu

Rcov

Rcov

Churn

Flay

Flog
The higher
the score, the
harder it is to
test

Flog
Code Seen as flog flog report
class Test class Test Test#blah: (11.2)
def blah def blah # 11.2 = 6.0: eval
a = eval "1+1" a = eval "1+1" # 1.2 + 6.0 + 1.2: branch
if a == 2 then if a == 2 then # 1.2 + 1.2 + 0.4 + 1.2: ==
puts "yay" puts "yay" # 1.2 1.2: puts
end end 1.2: assignment
end end 0.4: lit_fixnum
end end

Reek
• detects common code smells
might be hard to read,
• Class Variable maintain or evolve,
• Control Couple rather than things
that are specifically
• Data Clump wrong
• Duplication
• Feature Envy
• Large Class
• Long Method
• Long Parameter List
• Nested Iterators
• Simulated Polymorphism
• Uncommunicative Name
• Utility Function

Reek
Duplication Feature Envy
def double_thing() class Cart
@other.thing + @other.thing def price
end @item.price + @item.tax
end
end
def double_thing() class Cart
thing = @other.thing def price
thing + thing @item.price_with_tax
end end
end
class Item
def price_with_tax
price + tax
end
end

Reek

Roodi

Roodi
• warns you about design issues
• AssignmentInConditionalCheck
• CaseMissingElseCheck
• ClassLineCountCheck
• ClassNameCheck
• CyclomaticComplexityBlockCheck
• CyclomaticComplexityMethodCheck
• EmptyRescueBodyCheck
• ForLoopCheck
• MethodLineCountCheck
• MethodNameCheck
• ModuleLineCountCheck
• ModuleNameCheck
• ParameterNumberCheck

Stats

Thank You!
louiezhao@in-src.com