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Re: I LOVE PLACK!!!!

by Logicus
on Sep 01, 2011 at 21:43 UTC ( #923728=note: print w/ replies, xml ) Need Help??


in reply to I LOVE PLACK!!!!

QUOTE: If you've discovered something amazing about Perl that you just need to share with everyone, this is the right place. END;

For a given definition of amazing it seems!


Comment on Re: I LOVE PLACK!!!!
Re^2: I LOVE PLACK!!!!
by Corion (Pope) on Sep 02, 2011 at 07:26 UTC

    I would assume that Plack is amazing to you. But if you want to share your findings with others, maybe some paragraphs of text can also explain to others why you find the snippet you posted amazing. Maybe show what you were doing before, and how Plack made it easier/clearer/simpler. Just posting code won't tell people why the code is relevant.

      I would assume that Plack is amazing to you

      Well yeah... sure some of you got into that years ago probably but the future Perl community, us, the noobs, are still finding it and going wow...

      Ok I'll put some comments in there...

      listing of /var/www/action.psgi ------------------------------- use UNIVERSAL::require; ## # awesome peice of kit lets you do stuff like; # # my $module = "foo::bar"; # my $module->use(); # use Plack::Request; ## # # gives you alsorts of useful information on a silver # platter. # my $app = sub { ## # plack compiles the whole program into a subroutine, so # you gotta hand it a code ref with a specific format to # its return # local $_; # # give us our very own private temporary "$_" # pronounced "it" # $_->{'env'} = shift; $_->{'req'} = Plack::Request->new($_->{'env'}); $_->{'qd'} = $_->{'req'}->parameters->mixed; # # it's environment = shift # it's request = a new Plack request object that has # been handed a copy of "it's" environment # it's qd = all the query parameter pairs for it's request $_->{'qd'}->{'action'} ||= 'default'; # # make sure it's qd => action has a value or else set to # 'default' # $_->{'qd'}->{'action'} =~ s/\//\:\:/gs; # # convert any forward slashes to double colons # in it's qd => action # $_->{'qd'}->{'action'} = "actions::$_->{'qd'}->{'action'}"; # it's qd => action = "action::" and it's qd => action # # (as in concatenate "action" and the value of # it's qd action) # if ($_->{'qd'}->{'action'}->use()) { # # test if we are able to use the module name # for instance if no action=value pair is given # in the query data, then the action to be called # will default to "actions::default". # # if we have the module ("ie /actions/default.pm") # then call it's method called "render" to produce # the return value. return [ 200, ['Content-Type' => 'text/html'], [$_->{'qd'}->{'action'}->render()] ]; } else { #else the module doesn't exist, either it's been deleted #or they have typed the url wrong etc... return [ 404, [ 'Content-Type' => 'text/plain' ], [ 'Error cannot find requested page'] ]; } }; #Simples!!

      With that you can put .pm files in a file/directory structure such that a request for action=foo/bar/baz will automatically load the module baz.pm in the folder foo/bar

      That is such a neat little setup!

      The simplest action module would then go something like :

      sub render { "hello world" } 1;

      By using "it" in the PSGI file instead of "my" variables, the values remain available to the action modules thus :

      sub render { " hello user from $_->{'env'}->{'REMOTE_ADDR'}" } 1;

        Now just for fun install Mojolicious, and play around with Mojolicious::Lite. It can sit on top of Plack. Don't worry about its templating; it provides a means of layering in whatever system you prefer. Just see how much fun things like the stash and routes are.

        I don't guarantee you will like it. But I do guarantee it will be interesting to fiddle with for awhile.

        From the docs:

        # Using Mojolicious::Lite will enable "strict" and "warnings" use Mojolicious::Lite; # Route with placeholder get '/:foo' => sub { my $self = shift; my $foo = $self->param('foo'); $self->render(text => "Hello from $foo!"); }; # Start the Mojolicious command system app->start;

        It's not for everyone. And it's maybe not as flexible as Catalyst. But for rapid development of a web application it's fun.

        ...and as I mentioned, it can use Plack as its back-end, which means you can still have the Plack love.


        Dave

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