Dancer tutorial | Perl

1. Dancing Tutorial Alberto Manuel Brand˜o Sim˜es a o ambs@perl.pt Braga Geek Nights March 1st Alberto Sim˜es o Dancing Tutorial

2. Part 0: Ballet Alberto Sim˜es o Dancing Tutorial

3. What’s Dancer?

4. A micro framework for writing web applications

5. So, Yet Another Web Framework?

6. Well, yes!

7. CGI.pm webapps are spaghetti

8. Catalyst is HUGE

9. Ruby introduced something diﬀerent

11. We needed something similar in Perl

12. Deﬁnitely

13. And they also imitated us!

14. Available at http://perldancer.org and in GitHub.

15. Part 1: Tango Alberto Sim˜es o Dancing Tutorial

16. Installing § ¤ $ sudo cpan Dancer ¦ ¥ or § ¤ $ sudo cpan Task : : Dancer ¦ ¥ or yet § ¤ $ cpanm −S Task : : Dancer ¦ ¥ Alberto Sim˜es o Dancing Tutorial

17. Bootstrap application § ¤ $ dancer −a MyApp + MyApp / bin / app . pl + MyApp / config . yml + MyApp / environments / development . yml + MyApp / environments / production . yml + MyApp / views / index . tt + MyApp / views / layouts / main . tt + MyApp / lib / MyApp . pm + MyApp / public / javascripts / jquery . js + MyApp / public / css / style . css + MyApp / public / css / error . css + MyApp / public / images / . . . + MyApp / public / 5 0 0 . html + MyApp / public / 4 0 4 . html + MyApp / public / dispatch . fcgi + MyApp / public / dispatch . cgi + MyApp / Makefile . PL + MyApp /t /002 _index_route . t + MyApp /t /001 _base . t ¦ ¥ Alberto Sim˜es o Dancing Tutorial

18. What’s inside § ¤ + MyApp / bin / app . pl ¦ ¥ a standalone light server (starts server in port 3000); also used for fast-cgi or common cgi backends; § ¤ + MyApp / config . yml + MyApp / environments / development . yml + MyApp / environments / production . yml ¦ ¥ main configuration file (plugins, modules, etc); configuration files for production and development: defines what to report, where to report, etc. Alberto Sim˜es o Dancing Tutorial

19. What’s inside § ¤ + MyApp / bin / app . pl ¦ ¥ a standalone light server (starts server in port 3000); also used for fast-cgi or common cgi backends; § ¤ + MyApp / config . yml + MyApp / environments / development . yml + MyApp / environments / production . yml ¦ ¥ main configuration file (plugins, modules, etc); configuration files for production and development: defines what to report, where to report, etc. Alberto Sim˜es o Dancing Tutorial

20. What’s inside § ¤ + MyApp / views / index . tt + MyApp / views / layouts / main . tt ¦ ¥ Templates and layouts: templates are page portions/scraps; layouts are full page designs (they are automagically ﬁlled by the template); § ¤ + MyApp / public / javascripts / jquery . js + MyApp / public / css / style . css + MyApp / public / css / error . css + MyApp / public / images / . . . ¦ ¥ public/static ﬁles: javascript (Dancer ships with jsquery); cascade style sheets; images (for default design); Alberto Sim˜es o Dancing Tutorial

21. What’s inside § ¤ + MyApp / views / index . tt + MyApp / views / layouts / main . tt ¦ ¥ Templates and layouts: templates are page portions/scraps; layouts are full page designs (they are automagically ﬁlled by the template); § ¤ + MyApp / public / javascripts / jquery . js + MyApp / public / css / style . css + MyApp / public / css / error . css + MyApp / public / images / . . . ¦ ¥ public/static ﬁles: javascript (Dancer ships with jsquery); cascade style sheets; images (for default design); Alberto Sim˜es o Dancing Tutorial

22. What’s inside § ¤ + MyApp / public / 5 0 0 . html + MyApp / public / 4 0 4 . html ¦ ¥ pages for 500 and 404 errors; § ¤ + MyApp / public / dispatch . fcgi + MyApp / public / dispatch . cgi ¦ ¥ wrappers to conﬁgure fast-cgi and cgi backends; will be back on this later (future talk?); Alberto Sim˜es o Dancing Tutorial

23. What’s inside § ¤ + MyApp / public / 5 0 0 . html + MyApp / public / 4 0 4 . html ¦ ¥ pages for 500 and 404 errors; § ¤ + MyApp / public / dispatch . fcgi + MyApp / public / dispatch . cgi ¦ ¥ wrappers to conﬁgure fast-cgi and cgi backends; will be back on this later (future talk?); Alberto Sim˜es o Dancing Tutorial

24. What’s inside § ¤ + MyApp / Makefile . PL + MyApp /t /002 _index_route . t + MyApp /t /001 _base . t ¦ ¥ Main module Makeﬁle: usefull to make module of your application Your test suite; § ¤ + MyApp / lib / MyApp . pm ¦ ¥ Your application! Alberto Sim˜es o Dancing Tutorial

25. What’s inside § ¤ + MyApp / Makefile . PL + MyApp /t /002 _index_route . t + MyApp /t /001 _base . t ¦ ¥ Main module Makeﬁle: usefull to make module of your application Your test suite; § ¤ + MyApp / lib / MyApp . pm ¦ ¥ Your application! Alberto Sim˜es o Dancing Tutorial

26. Part 2: Flamenco Alberto Sim˜es o Dancing Tutorial

27. Traﬃc Control Your MyApp/lib/MyApp.pm includes: § ¤ p a c k a g e MyApp ; u s e Dancer ’ : s y n t a x ’ ; our $VERSION = ’ 0 . 1 ’ ; get ’ / ’ => sub { template ’ i n d e x ’ ; }; true ; ¦ ¥ Alberto Sim˜es o Dancing Tutorial

28. How to test it? Start the standalone server, § ¤ [ ambs@rachmaninoff MyApp ] $ bin / app . pl ¦ ¥ that shows debug info, § ¤ [ 9 3 8 7 ] core @0 .000017 > loading Dancer : : Handler : : Standalone handler in / opt / lib / perl5 / site_perl / 5 . 1 2 . 3 / Dancer / Handler . pm l . 39 [ 9 3 8 7 ] core @0 .000442 > loading handler ’ Dancer : : Handler : : Standalone ’ in / opt / l o c a l / lib / perl5 / site_perl / 5 . 1 2 . 3 / Dancer . pm l . 230 >> Dancer 1 . 3 0 1 1 server 9387 listening on http : / / 0 . 0 . 0 . 0 : 3 0 0 0 subsection { Entering the development dance floor . . . } ¦ ¥ and open a browser in the speciﬁed port. Alberto Sim˜es o Dancing Tutorial

29. It Works!

30. Route Handlers A Dancer app is a collection of route handlers; A route handler is, basically, a sub; It is bound to an http method; And to a path or a path pattern; Example get ’ / ’ => sub { . . . }; post ’ / s u b m i t / : f i l e ’ => sub { . . . }; del ’ / r e s o u r c e /∗ ’ => sub { . . . }; Alberto Sim˜es o Dancing Tutorial

31. Route Handlers A Dancer app is a collection of route handlers; A route handler is, basically, a sub; It is bound to an http method; And to a path or a path pattern; Example get ’ / ’ => sub { . . . }; post ’ / s u b m i t / : f i l e ’ => sub { . . . }; del ’ / r e s o u r c e /∗ ’ => sub { . . . }; Alberto Sim˜es o Dancing Tutorial

32. Route Handlers Static patterns (paths): § ¤ get ’ / ’ => sub { . . . }; get ’ / a b o u t ’ => sub { . . . }; ¦ ¥ Patterns with named tokens: § ¤ get ’ / book / : i d ’ => sub { # do s o m e t h i n g w i t h params −>{i d } ... }; get ’ / u s e r / : g r o u p / : u i d ’ => sub { # u s e params −>{u i d } and params −>{g r o u p } h e r e }; ¦ ¥ Alberto Sim˜es o Dancing Tutorial

33. Route Handlers Static patterns (paths): § ¤ get ’ / ’ => sub { . . . }; get ’ / a b o u t ’ => sub { . . . }; ¦ ¥ Patterns with named tokens: § ¤ get ’ / book / : i d ’ => sub { # do s o m e t h i n g w i t h params −>{i d } ... }; get ’ / u s e r / : g r o u p / : u i d ’ => sub { # u s e params −>{u i d } and params −>{g r o u p } h e r e }; ¦ ¥ Alberto Sim˜es o Dancing Tutorial

34. Route Handlers Patterns with anonymous tokens: § ¤ get ’ / f i l e / ∗ . ∗ ’ => sub { my ( $file , $ext ) = splat ; ... } get ’ / show /∗/∗ ’ => sub { my ( $cat , $subcat ) = splat ; }; ¦ ¥ Regular expressions: § ¤ get qr { post / ( d+)−(d+)−(d+)} => sub { my ( $year , $month , $day ) = splat ; } ¦ ¥ Alberto Sim˜es o Dancing Tutorial

35. Route Handlers Patterns with anonymous tokens: § ¤ get ’ / f i l e / ∗ . ∗ ’ => sub { my ( $file , $ext ) = splat ; ... } get ’ / show /∗/∗ ’ => sub { my ( $cat , $subcat ) = splat ; }; ¦ ¥ Regular expressions: § ¤ get qr { post / ( d+)−(d+)−(d+)} => sub { my ( $year , $month , $day ) = splat ; } ¦ ¥ Alberto Sim˜es o Dancing Tutorial

36. Part 3: Mambo Alberto Sim˜es o Dancing Tutorial

37. Templating Dancer has plugins for most templating systems: Mason, Template Toolkit and others. Default is a Simple template system, built-in Dancer. Use the template inside the route: § ¤ get ’ / u s e r / : name ’ => sub { template ’ p r o f i l e ’ => { username => params−>{name } } ; }; ¦ ¥ Alberto Sim˜es o Dancing Tutorial

38. Templating Dancer has plugins for most templating systems: Mason, Template Toolkit and others. Default is a Simple template system, built-in Dancer. Use the template inside the route: § ¤ get ’ / u s e r / : name ’ => sub { template ’ p r o f i l e ’ => { username => params−>{name } } ; }; ¦ ¥ Alberto Sim˜es o Dancing Tutorial

39. Rerouting You can reroute by: Passing the control to the next matching handler: § ¤ get ’ / l a z y ’ => sub { pass and r e t u r n false ; }; ¦ ¥ Redirecting to other URI: § ¤ get ’ / f o r b i d d e n ’ => sub { r e t u r n redirect ’ / b e t t e r / p l a c e ’ }; ¦ ¥ Alberto Sim˜es o Dancing Tutorial

42. Serving Files You can serve a static ﬁle: § ¤ get ’ / dowload / : f i l e ’ => sub { my $file = params−>{file } ; pass and r e t u r n false u n l e s s −f $file ; send_file $file ; }; ¦ ¥ If the content is generated, just change content-type: § ¤ get ’ / readme . t x t ’ => sub { content_type ’ t e x t / p l a i n ’ ; return ’ this is plain text ’ }; ¦ ¥ Alberto Sim˜es o Dancing Tutorial

43. Serving Files You can serve a static ﬁle: § ¤ get ’ / dowload / : f i l e ’ => sub { my $file = params−>{file } ; pass and r e t u r n false u n l e s s −f $file ; send_file $file ; }; ¦ ¥ If the content is generated, just change content-type: § ¤ get ’ / readme . t x t ’ => sub { content_type ’ t e x t / p l a i n ’ ; return ’ this is plain text ’ }; ¦ ¥ Alberto Sim˜es o Dancing Tutorial

44. Thanks to Alexis Sukrieh (I stole some slides)

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