Carton CPAN dependency manager

Transcript

1. Carton Tatsuhiko Miyagawa YAPC::Asia 2011 Tokyo Friday, October 14, 2011

2. Managing CPAN Dependencies Friday, October 14, 2011

3. Case Study: (Poor) Web Development Friday, October 14, 2011

4. You’re writing a new web app. You don’t wanna reinvent

   wheels. Want to use as many CPAN deps. Friday, October 14, 2011

5. Fine. Get them from CPAN, install on your machine. Friday,

   October 14, 2011

6. >  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 Friday, October 14, 2011

7. Test it... Friday, October 14, 2011

8. Works? Ship it! Friday, October 14, 2011

9. Deployment Set up new production servers. Install CPAN modules (until

   the errors are gone) Friday, October 14, 2011

10. Few weeks later... Friday, October 14, 2011

11. Your website is popular! Need more web servers! Friday, October

    14, 2011

12. Re-Deployment Set up new production servers. Install CPAN modules (until

    the errors are gone) Friday, October 14, 2011

13. “Crap, Web::Framework has been updated to 1.4 and many APIs

    have been changed or deprecated!” Friday, October 14, 2011

14. Rollback Log in to the old web server. Check Perl

    module versions. Install them on the new server. Friday, October 14, 2011

15. “Crap, this author deleted the version 1.20 we want. Let’s

    go to BackPAN...” Friday, October 14, 2011

16. “Crap, version 1.20 doesn’t actually work with the newer LWP

    6 that we just installed! Have to downgrade this too...” Friday, October 14, 2011

17. and so on. Friday, October 14, 2011

18. What was wrong? Friday, October 14, 2011

19. • Dependency declaration • Isolated Perl environments • Version controls/history

    • Dependency analysis • Repeatable deployments • etc. Friday, October 14, 2011

20. Many existing solutions MyCPAN, DPAN, CPAN::Mini::Inject, OrePAN, Shipwright Friday, October

    14, 2011

21. None of those didn’t quite work for me. (Or I

    haven’t even tried) Friday, October 14, 2011

22. So I wrote a new one. Friday, October 14, 2011

23. Carton https://github.com/miyagawa/carton Friday, October 14, 2011

24. Inspired by... Friday, October 14, 2011

25. Friday, October 14, 2011

26. • 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 Friday, October 14, 2011

27. Local perl environment Using local::lib and cpanm -L Each app

    has an isolated local library path Friday, October 14, 2011

28. Fast and safe install cpanm 1.5 Saves MYMETA.json and install

    meta info Friday, October 14, 2011

29. Dep tree analysis Rebuild the dependency tree from meta info

    Checks if anything is missing/superflous Friday, October 14, 2011

30. Locking versions Versions are saved in carton.lock including dependencies Friday,

    October 14, 2011

31. Easy Redeployment Reinstall exactly the same set of modules on

    another prod/development machines. Friday, October 14, 2011

32. Single-file, VCS friendly You can add carton.lock to git update

    whenever you update modules Friday, October 14, 2011

33. Safe and easy rollback revert the lock file and redeploy

    Friday, October 14, 2011

34. DEMO Friday, October 14, 2011

35. >  cpanm  Carton Friday, October 14, 2011

36. WARNING It is beta software, some features are missing or

    not working correctly (yet). Friday, October 14, 2011

37. github.com/miyagawa/carton irc.perl.org #carton Friday, October 14, 2011

38. Questions? Friday, October 14, 2011

39. Thanks! twitter.com/miyagawa Friday, October 14, 2011