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Dancing Tutorial
 

Dancing Tutorial

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A brief tutorial to the Dancer web framework. Held in 1/March/2011 in Braga Geek Nights.

A brief tutorial to the Dancer web framework. Held in 1/March/2011 in Braga Geek Nights.

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    Dancing Tutorial Dancing Tutorial Presentation Transcript

    • Dancing TutorialAlberto Manuel Brand˜o Sim˜es a o ambs@perl.pt Braga Geek Nights March 1st Alberto Sim˜es o Dancing Tutorial
    • Part 0: Ballet Alberto Sim˜es o Dancing Tutorial
    • What’s Dancer?
    • A micro frameworkfor writing web applications
    • So, Yet Another Web Framework?
    • Well, yes!
    • CGI.pm webapps are spaghetti
    • Catalyst is HUGE
    • Ruby introduced something different
    • We needed something similar in Perl
    • Definitely
    • And they also imitated us!
    • Available athttp://perldancer.org and in GitHub.
    • Part 1: Tango Alberto Sim˜es o Dancing Tutorial
    • Installing § ¤ $ sudo cpan Dancer ¦ ¥ or § ¤ $ sudo cpan Task : : Dancer ¦ ¥ or yet § ¤ $ cpanm −S Task : : Dancer ¦ ¥ Alberto Sim˜es o Dancing Tutorial
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • Part 2: Flamenco Alberto Sim˜es o Dancing Tutorial
    • 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
    • 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
    • It Works!
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • Part 3: Mambo Alberto Sim˜es o Dancing Tutorial
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • Thanks to Alexis Sukrieh (I stole some slides)