Continuous Integration For Rails Project

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 • 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

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

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

Thank You! louiezhao@in-src.com

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Continuous Integration For Rails Project

by Louie Zhao on Oct 25, 2009

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