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Carton managing CPAN dependencies Tatsuhiko Miyagawa @miyagawa London Perl Workshop 2013 Saturday, November 30, 13

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Me • Tatsuhiko Miyagawa • Lives in San Francisco • {github,twitter,CPAN}/miyagawa Saturday, November 30, 13

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Thank You! Saturday, November 30, 13

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Managing CPAN Dependencies Saturday, November 30, 13

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How many CPAN modules your app depends on? Saturday, November 30, 13

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When is the last time upgrading a CPAN module broke your app? Saturday, November 30, 13

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Case Study: Web App Development Saturday, November 30, 13

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You’re writing a new web app using as many CPAN modules. Saturday, November 30, 13

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Get them from CPAN, install on your machine. Saturday, November 30, 13

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john@local>  cpanm  Web::Framework installed  LWP-­‐5.912 installed  Plack-­‐0.9980 installed  Web-­‐Framework-­‐1.10 Saturday, November 30, 13

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Test it... Saturday, November 30, 13

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Works? Ship it! Saturday, November 30, 13

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What if ... Saturday, November 30, 13

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• Jul 2nd: Started working on project • using Web::Framework 1.1 • Jul 9th: Finished version 1.0 • Jul 10-15th: internal beta, QA • Jul 16th: Deploy to the production Saturday, November 30, 13

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• Jul 2nd: Started working on project • using Web::Framework 1.1 • Jul 9th: Finished version 1.0 • Jul 10-15th: internal beta, QA • Jul 15th: Web::Framework 1.2 is released • Jul 16th: Deploy to the cloud/production Saturday, November 30, 13

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root@prod>  cpanm  Web::Framework installed  LWP-­‐5.912 installed  Plack-­‐0.9980 installed  Web-­‐Framework-­‐1.20 Saturday, November 30, 13

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Web::Framework 1.2 API changes! Saturday, November 30, 13

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Saturday, November 30, 13

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“Upgrading CPAN modules broke my app” Saturday, November 30, 13

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Dependencies are part of your app. Saturday, November 30, 13

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a solution cpanm 1.6 Saturday, November 30, 13

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>  cpanm  Web::Framework@1.10 installed  Web-­‐Framework-­‐1.10 Saturday, November 30, 13

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>  cpanm  Web::Framework~">=  1.0,  <  1.2" installed  Web-­‐Framework-­‐1.19 Saturday, November 30, 13

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♥ MetaCPAN Saturday, November 30, 13

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a solution cpanfile + cpanm 1.6 Saturday, November 30, 13

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>  cat  cpanfile requires  'Web::Framework',  '==  1.10'; >  cpanm  -­‐-­‐installdeps  . installed  Web-­‐Framework-­‐1.10 Saturday, November 30, 13

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cpanfile DSL to describe prereqs Saturday, November 30, 13

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requires  'Catalyst',  '5.8000';   recommends  'JSON::XS',  '2.0'; on  'test'  =>  sub  {    requires  'Test::More',  '>=  0.96' }; on  'develop'  =>  sub  {    recommends  'Devel::NYTProf'; }; feature  'sqlite'  =>  sub  {    requires  'DBD::SQLite'; }; Saturday, November 30, 13

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inspired by: gemfile(5) Saturday, November 30, 13

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Compatible to: Module::Install(::DSL) Saturday, November 30, 13

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Converted to: CPAN::Meta::Prereqs Saturday, November 30, 13

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Toolset Module::CPANfile Module::Install::CPANfile Dist::Zilla plugins Saturday, November 30, 13

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Supported by dzil, Milla & cpanm 1.6 Saturday, November 30, 13

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cpanfile + cpanm • Simple • Yet powerful and flexible way to describe dependencies and version requirements • Version control cpanfile Saturday, November 30, 13

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caveats • Locking each dependency with specific version is tedious work • Can only lock direct dependencies • MetaCPAN as SPOF • No easy/reliable way to rollback Saturday, November 30, 13

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Many other solutions Needs servers, Needs databases Too simple, Too complicated, etc. Saturday, November 30, 13

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the new Solution Saturday, November 30, 13

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Carton https://github.com/miyagawa/carton Saturday, November 30, 13

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Inspired by... Saturday, November 30, 13

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Saturday, November 30, 13

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Basic idea: Describe CPAN dependencies snapshot tarball pathnames Saturday, November 30, 13

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Built on top of: cpanfile + cpanm 1.7 Saturday, November 30, 13

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• App-specific local environment • Fast and safe install with caches • Dep-tree analysis, including versions • Freezing module versions • Conservative updates • Easy Redeployment, Rollback • Single-file, VCS friendly Saturday, November 30, 13

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Local perl environment Using local::lib and cpanm -L Each app has an isolated local library path Saturday, November 30, 13

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Fast and safe install Saves MYMETA.json and install meta info Saturday, November 30, 13

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Dep tree analysis Rebuild the dependency tree from snapshot Checks if anything is missing/superfluous Saturday, November 30, 13

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Freezing versions Versions are saved in snapshots including dependencies Saturday, November 30, 13

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Easy Redeployment Reinstall exactly the same set of modules on another prod/development machines. Saturday, November 30, 13

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Conservative Update Modules won't be upgraded unless it is required, or manually updated. Saturday, November 30, 13

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Single-file, VCS friendly You can add cpanfile.snapshot to git update whenever you update modules "Dependencies are part of your app." Saturday, November 30, 13

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Safe and easy rollback revert the lock file and redeploy Saturday, November 30, 13

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DEMO Saturday, November 30, 13

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Deployment with Carton Saturday, November 30, 13

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 @local>  carton  install  @local>  git  commit  cpanfile.snapshot  @local>  git  push @remote>  carton  install  -­‐-­‐deployment @remote>  carton  exec  plackup  ... Saturday, November 30, 13

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Example: github.com/miyagawa/cpanmetadb-perl capistrano, Server::Starter, carton, plackup (twiggy) Saturday, November 30, 13

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PaaS/Cloud github.com/miyagawa/heroku-buildpack-perl Saturday, November 30, 13

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Saturday, November 30, 13

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http://weblog.bulknews.net Saturday, November 30, 13

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Support to come! Dokku, DotCloud, Travis CI, Cloud Foundry etc. Saturday, November 30, 13

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carton 1.0 on CPAN Saturday, November 30, 13

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>  cpanm  Carton Saturday, November 30, 13

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Preview: next major releases Saturday, November 30, 13

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cpanm 1.8 git (+ any URL) support in index Saturday, November 30, 13

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cpanfile 1.1 git syntax support Saturday, November 30, 13

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requires  'Plack',  '1.0000',    git  =>  'git://github.com/plack/Plack.git',    ref  =>  'devel'; carton 1.1 Saturday, November 30, 13

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requires  'Plack',  '1.0011',    dist  =>  'MIYAGAWA/Plack-­‐1.0011.tar.gz'; carton 1.1 Saturday, November 30, 13

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requires  'Plack',  '1.0011',    dist  =>  'http://darkpan/Plack-­‐1.tar.gz'; carton 1.1 Saturday, November 30, 13

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(demo) Saturday, November 30, 13

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cpanm 1.8 • Rewrite internals • Backend API • Plugin support • CPAN Testers support (via plugins) Saturday, November 30, 13

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carton 1.1 • binstubs • configure args/hints support • safe exec on development • remember options (--path etc.) Saturday, November 30, 13

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github.com/miyagawa/carton irc.perl.org #carton Saturday, November 30, 13

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speakerdeck.com /miyagawa Saturday, November 30, 13

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gum.co/BmXz Saturday, November 30, 13

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Questions? Saturday, November 30, 13