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Carton Tatsuhiko Miyagawa OSDC.TW 2012 Sunday, April 15, 12

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ࣗݾ঺հ • ٶ઒ ୡ඙ Tatsuhiko Miyagawa • github.com/miyagawa • Twitter @miyagawa • Lives in San Francisco, CA Sunday, April 15, 12

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Sunday, April 15, 12

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Sunday, April 15, 12

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Sunday, April 15, 12

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Sunday, April 15, 12

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Managing CPAN Dependencies Sunday, April 15, 12

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Case Study: Web App Development Sunday, April 15, 12

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You’re writing a new web app. You don’t wanna reinvent wheels. Want to use as many CPAN deps. Sunday, April 15, 12

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Fine. Get them from CPAN, install on your machine. Sunday, April 15, 12

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>  cpanm  Web::Framework installed  LWP-­‐5.912 installed  Plack-­‐0.9980 installed  Web-­‐Framework-­‐1.20 >  cpanm  JSON::Fast installed  JSON-­‐Fast-­‐1.91 >  cpanm  MIME::Parser::XS installed  MIME-­‐Parser-­‐XS-­‐0.20 Sunday, April 15, 12

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Test it... Sunday, April 15, 12

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Works? Ship it! Sunday, April 15, 12

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Deployment Set up new production servers. Install used CPAN modules Sunday, April 15, 12

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Few weeks later... Sunday, April 15, 12

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Your website is popular! Need more web servers! Sunday, April 15, 12

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Re-Deployment Set up new production servers. Install CPAN modules. Sunday, April 15, 12

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“Crap, Web::Framework has been updated to 1.4 and many APIs have been changed or deprecated!” Sunday, April 15, 12

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Rollback Log in to the old web server. Check Perl module versions. Install them on the new server. Sunday, April 15, 12

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“Crap, this author deleted the version 1.20 we want. Let’s go to BackPAN...” Sunday, April 15, 12

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“Crap, version 1.20 doesn’t actually work with the newer LWP 6 that we just installed! Have to downgrade this too...” Sunday, April 15, 12

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“Upgrading CPAN modules broke my app” Sunday, April 15, 12

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What was wrong? Sunday, April 15, 12

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• Dependency declaration • Isolated Perl environments • Version controls/history • Dependency analysis • Repeatable deployments • etc. Sunday, April 15, 12

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Many existing solutions MyCPAN, DPAN, CPAN::Mini::Inject, OrePAN, Shipwright Sunday, April 15, 12

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None of those didn’t quite work for me. (Or I haven’t even tried) Sunday, April 15, 12

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So I wrote a new one. Sunday, April 15, 12

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Carton https://github.com/miyagawa/carton Sunday, April 15, 12

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Inspired by... Sunday, April 15, 12

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• App-specific local environment • Fast and safe install • Dep-tree analysis, including versions • Locking module versions • Easy Redeployment • Single-file, VCS friendly • Safe and easy rollback Sunday, April 15, 12

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Local perl environment Using local::lib and cpanm -L Each app has an isolated local library path Sunday, April 15, 12

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Fast and safe install cpanm 1.5 Saves MYMETA.json and install meta info Sunday, April 15, 12

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Dep tree analysis Rebuild the dependency tree from meta info Checks if anything is missing/superfluous Sunday, April 15, 12

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Locking versions Versions are saved in carton.lock including dependencies Sunday, April 15, 12

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Easy Redeployment Reinstall exactly the same set of modules on another prod/development machines. Sunday, April 15, 12

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Single-file, VCS friendly You can add carton.lock to git update whenever you update modules Sunday, April 15, 12

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Safe and easy rollback revert the lock file and redeploy Sunday, April 15, 12

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Declaring CPAN dependencies Sunday, April 15, 12

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CPAN Distributions: Makefile.PL  or  Build.PL Sunday, April 15, 12

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Carton apps: cpanfile Sunday, April 15, 12

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cpanfile Module::Install + CPAN::Meta Sunday, April 15, 12

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requires  ‘Plack’,  0.99; on  ‘develop’  =>  sub  {    recommends  ‘Devel::Cover’; }; test_requires  ‘Test::Warn’; requires  ‘Devel::NYTProf’,  ‘>=  3.2,  <  5’; conflicts  ‘MooseX::Declare’,  ‘<  0.99’; Sunday, April 15, 12

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WHY • Your applications are not CPAN dists. • GitHub scripts • PaaS • DotCloud • Heroku • Stackato Sunday, April 15, 12

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DEMO Sunday, April 15, 12

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>  cpanm  Carton Sunday, April 15, 12

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ܯࠂ It is beta software, some features are missing or not working correctly (yet). Sunday, April 15, 12

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TODO / Roadmap • Update specific modules • Make install and bundle faster • Inject old versions / patched versions • Install from git SHA Sunday, April 15, 12

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github.com/miyagawa/carton irc.perl.org #carton Sunday, April 15, 12

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Sunday, April 15, 12

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໰୊ʁ Sunday, April 15, 12

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ँँʂ speakerdeck.com/u/miyagawa Sunday, April 15, 12