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Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
Perl Dancer for Python programmers
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Perl Dancer for Python programmers

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This is a talk given at PyWeb IL Oct 4th.

This is a talk given at PyWeb IL Oct 4th.

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  • 1. Dancer (the Effortless Perl Web Framework)
  • 2. About me ● Sawyer X ● Sysadmin / Perl Ninja ● Israel.pm / Haifa.pm / TelAviv.pm / Rehovot.pm ● I do system, networking, web, applications, etc. ● http://blogs.perl.org/users/sawyer_x/ ● http://search.cpan.org/~xsawyerx/
  • 3. Perl web recap 1995 CGI
  • 4. Perl web recap 2010 Many frameworks (including micro-frameworks like Dancer)
  • 5. The big web religions, illustrated
  • 6. Ruby – the fanboys
  • 7. Python – the sticklers
  • 8. PHP – the nonsensical
  • 9. Perl – the nutcases
  • 10. Nutcases? ● Yes, we are insane (but not LISP-insane) ● Insanity is a whole lot of fun! ● Insanity gives us flexibility ● Flexibility gives us cool stuff ● Like Moose and meta-programming ● Like DBIx::Class ● Like Dancer
  • 11. Flask (Pythonese) from flask import Flask app = Flask(__name__) @app.route("/", methods=['GET']) def hello():     return "Hello World!" if __name__ == "__main__":     app.run()
  • 12. Dancer (Perlesque) use Dancer; get “/hi” => sub {     “Hello, World!” }; dance;
  • 13. In comparison from flask import Flask use Dancer; app = Flask(__name__) @app.route("/", methods=['GET']) get “/” => sub { def hello():   “Hello, World!”     return "Hello World!" }; if __name__ == "__main__":     app.run() dance;
  • 14. Dancer treats ● Both read and write, easily! ● Route-based (started as a port of Sinatra) ● PSGI/Plack compliant (PSGI is our WSGI) ● Minimum dependencies ● Any app is also a web server ● CPAN-friendly (<3 CPAN)
  • 15. Recipe for Dancing ● Take an HTTP method ● Add a path to that ● Mix with a subroutine ● And sprinkle plugins and keywords on top
  • 16. Dancer route structure get     '/path' => sub { … }; post    '/path' => sub { … }; put     '/path' => sub { … }; del     '/path' => sub { … }; options '/path' => sub { … }; any     '/path' => sub { … };
  • 17. Dancer ● Paths can contain variables get '/hello/:entity/' ● Paths can be Regular Expressions get qr{/ (w+) / d{2,3} (.+)? }x
  • 18. Dancer login example post '/login' => sub {     # Validate the username and password     if ( params­>{user} eq 'bob' &&          params­>{pass} eq 'LetMeIn' ) {         session user => params­>{user};         redirect params­>{path} || '/';     } else {         redirect '/login?failed=1';     }  };
  • 19. Templating get '/' => sub {     template index => {         greeting => 'welcome'     } };
  • 20. More nifty stuff ● headers 'My­X­Header' => 'Value' ● send_file('report.tar.gz') ● set_cookie name    => 'value',            expires => ( time + 3600 ),            domain  => 'foo.com' ● status 'not_found' ● to_json, to_yaml, to_xml ● my $file        = upload('file_input') ● my $all_uploads = request­>uploads
  • 21. Dancer as Perl philosophy ● Dancer is succinct, efficient and easy to work with ● Dancer is daring (Do you have route caching in Django?) (Websockets in near future!) ● Dancer has a lot of plugins: (engines for sessions, logging, templates) ● Serializers (JSON, YAML, XML) ● Route filters (before, after, before_template)
  • 22. Oh yeah, route caching...
  • 23. Dancer::Plugin::REST get '/user/:id.:format' => sub {     UserRS­>find( params­>{id} ); }; # curl http://mywebservice/user/42.json { "id": 42, "name": "John Foo",              "email": "john.foo@hopkins.com" } # curl http://mywebservice/user/42.yml ­­ id: 42 name: "John Foo" email: "john.foo@hopkins.com"
  • 24. Dancer::Plugin::SiteMap use Dancer::Plugin::SiteMap; ● You get: /sitemap and /sitemap.xml ● “Yup, it's that simple.”
  • 25. Dancer::Plugin::Email post '/contact' => sub {     email {         to      => 'a@b.com',         subject => 'Test',         message => $msg,         attach  => [ path => 'name' ],     } };
  • 26. Dancer::Plugin::Authorize post '/login' => sub {     my $user = params­>{'user'};     my $pass = params­>{'pass'};     if ( auth( $user, $pass ) ) {         if ( auth_asa('guest')  ) {...}         if ( auth_can('create') ) {...}     } };
  • 27. Dancer::Plugin::Ajax ajax '/check_for_update' => sub {     # some ajax code }; ● Pass if X-Request-With not “XMLHttpRequest” ● Disable the layout ● The action built is a POST request
  • 28. Dancer::Plugin::DBIC ● DBIC (DBIx::Class) – a sophisticated ORM ● Configure the connection in the config file ● Make the ResultSets available in routes
  • 29. Dancer::Plugin::Database ● Database(s) connection in Dancer get '/widget/view/:id' => sub {    my $sth = database­>prepare(         'select * from widgets where id = ?'    );    $sth­>execute( params­>{id} );    template display_widget => {        widget => $sth­>fetchrow_hashref,    }; };
  • 30. In culmination Dancer is beautiful and fun The way programming should be PerlDancer.org search.cpan.org/perldoc?Dancer

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