Dancing Tutorial
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The document provides a tutorial on using the Dancer web framework in Perl. It describes what Dancer is, how to install it and generate a basic application scaffolding. It then explains the directory structure and key files that are generated, including configuration files, templates, static assets, and the main application module. It also demonstrates how to start the development server and test that the basic application is working.
![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](https://image.slidesharecdn.com/dancer-110301061249-phpapp01/85/Dancing-Tutorial-28-320.jpg)
Dancing Tutorial
- 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
- 4. A micro framework for writing web applications
- 5. So, Yet Another Web Framework?
- 6. Well, yes!
- 7. CGI.pm webapps are spaghetti
- 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
- 40. 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
- 41. 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)