Modern Perl

Fifteen years of Perl development

Everyone uses Perl to build dynamic web sites

Web technology has moved on since then

Perl technology has moved on since then

Perceptions of Perl are stuck in the mid 90s

Hi! We're the Perl community and we suck at marketing

Perl has all the facilities you would expect in a modern dynamic language

Perl 5 is the current version of Perl

Perl 6 is still in development

(If you want to know more about Perl 6 then ask me later)

Dear [% name %], You owe me £[% debt %]. Please pay up by [% date %] or I'll send the boys round. Love Dave...

#!/usr/bin/perl use Template; my $tt = Template->new; my $data = { name => 'Joe Random', debt => 100, date => '18 September', }; $tt->process('template.tt', $data);

[% FOREACH debt IN debts %] Dear [% debt.name %], You owe me £[% debt.amount %]. Please pay up by [% debt.date %] or I'll send the boys round. Love Dave... [% END %]

#!/usr/bin/perl use Template; use Debt; my $tt = Template->new; my @debts = Debt->find_all; $tt->process('template.tt', { debts => debts});

$ dbicdump MyClass 'dbi:mysql:<db>;<hostname>' <user> <password> Dumping manual schema for MyClass to directory . ... Schema dump completed.

Attribute for each column ,[object Object]

Data type inflation ,[object Object]

#!/usr/bin/perl use MyClass; my $sch = MyClass->connect('...'); my $objs = $sch->resultset('MyTable'); while ($objs->next) { print $_->name, “”; }

while (<FILE>) { my ($code, $name, $desc) = split; my $new_obj = $objs->create({ code => $code, name => $name, desc => $desc, }); print 'New object id: ', $new_obj->id, “”; }

The Modern Object System for Perl 5

Perl 5's standard OO system looks a bit bolted on

(That's because it was bolted on)

Moose hides all that nastiness

Declarative syntax for attributes

package Debt; use Moose; has name => (isa => 'Str', is => 'rw', required => 1); has amount => (isa => 'Num', is => 'rw', required => 1); has date => (isa => 'DateTime', is => 'rw');

#!/usr/bin/perl use 5.010; use strict; use warnings; use Debt; my $debt = Debt->new({ name => 'Joe Random', amount => 100, }); say $debt->name, ' owes £', $debt->amount; # Add interest $debt->amount($debt->amount * 1.1); say $debt->name, ' owes £', $debt->amount;

use DateTime; # Set due date $debt->date(DateTime->now->add(days => 28)); say $debt->date; # Easier to read say $debt->date->strftime('%A %d %B %Y');

Triggers ,[object Object],[object Object]

Easy to get application framework running

$ catalyst.pl MyApp created "MyApp" created "MyApp/script" created "MyApp/lib" created "MyApp/root" created "MyApp/root/static" created "MyApp/root/static/images" created "MyApp/t" [ ... ] created "MyApp/Makefile.PL" created "MyApp/script/myapp_cgi.pl" created "MyApp/script/myapp_fastcgi.pl" created "MyApp/script/myapp_server.pl" created "MyApp/script/myapp_test.pl" created "MyApp/script/myapp_create.pl" Change to application directory and Run "perl Makefile.PL" to make sure your install is complete

$ cd MyApp $ script/myapp_server.pl [debug] Debug messages enabled [debug] Statistics enabled [debug] Loaded plugins: .----------------------------------------------------------------------------. | Catalyst::Plugin::ConfigLoader 0.27 | '----------------------------------------------------------------------------' [ ... lots of information ... ] [info] MyApp powered by Catalyst 5.80023 You can connect to your server at http://localhost:3000

Plugins to handle common requirements

Plack is a reference implementation

Different application technologies

Different web hosting technologies

Take a PSGI application and run it anywhere

PSGI app is a subroutine reference

# app.psgi my $app = sub { # clever stuff goes here };

Input comes from a hash passed to sub

# app.psgi my $app = sub { my $env = shift; # clever stuff goes here };

Sub returns a reference to an array

# app.psgi my $app = sub { my $env = shift; return [ 200, [ 'Content-type', 'text/plain' ], [ 'Hello world' ], ]; };

Plack distribution includes many tools

plackup - a simple PSGI web server

$ plackup app.psgi HTTP::Server::PSGI Accepting connections at http://localhost:5000/

Plack::Request Plack::Response

use Plack::Request; use Plack::Response; use Data::Dumper; my $app = sub { my $req = Plack::Request->new(shift); my $res = Plack::Response->new(200); $res->content_type('text/plain'); $res->body(Dumper $req); return $res->finalize; }

Plack::Middleware::* Plack::App::*

Most Perl web frameworks support Plack

Modern Perl

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