1. Plackdo
or
how to play with perl6
Nobuo Danjou , @lopnor

2. Self Introduction
• Nobuo Danjou
• living in Komaba, Tokyo
• Freerance programmer
• http://soffritto.org/, @lopnor
• This is my Second Time in Taipei!

3. What’s Plackdo?
• rough port of Plack to rakudo / perl 6

4. What’s Rakudo?
• a perl 6 implementation
• http://rakudo.org/
• http://github.com/rakudo

5. What’s Plack?
• «PSGI is an interface between Perl
web applications and web servers,
and Plack is a Perl module and
toolkit that contains PSGI
middleware, helpers and adapters
to web servers.»
http://plackperl.org/

6. What’s PSGI?
my $app = sub {
my $env = shift;
return [
200,
[ ‘Content-Type’ => ‘text/plain’ ],
[ ‘Hello World’ ],
];
};

7. Web on perl 6
• some implementations
• november (wiki on perl6)
• web (plack like interface and template
engines)
• .... and others

8. Why Plack to Perl 6?
• to learn perl 6
• you can be the EARLY ADAPTER NOW!
• you need some playground
• making web application is good playground

9. Why this talk?
• YAPC::Asia every year
• perl 6 talks every year
• but did nothing every year!
• rakudo star released!
• you can easily start now!

10. plackdo history
• start thinking about it in Sep
2010(YAPC::Asia)
• started implementation in Nov 2010
(Siberian Railway)
• ported my blog to plackdo in Jan 2011

11. how it works
sub (%env) {
return [
200,
[ ‘Content-Type’ => ‘text/plain’ ],
[ %env.perl ],
];
};

12. PSGI
sub {
my $env = shift;
return [
200,
[ ‘Content-Type’ => ‘text/plain’ ],
[ ‘Hello World’ ],
];
};

13. P6SGI
sub (%env) {
return [
200,
[ ‘Content-Type’ => ‘text/plain’ ],
[ %env.perl ],
];
};

14. how it works
$ PERL6LIB=blib/lib plackdup

15. how it works
demo
show codes here

16. sockets
• using parrot sockets
• rakudo/t/spec/S32-io/IO-Socket-INET.pl
• not tested now (it fails)

17. echo server
#!/usr/bin/env perl6
use v6;
# constants
sub PF_INET {2}
sub SOCK_STREAM {1}
sub TCP {6}
sub MAIN ($port = '5000', :$host = '0.0.0.0') {
my $server = IO::Socket::INET.socket( PF_INET, SOCK_STREAM,
TCP );
$server.bind($host, $port);
$server.listen;
while my $conn = $server.accept {
while my $str = $conn.recv {
$conn.send($str);
}
$conn.close;
}
$server.close;
}
# vim: ft=perl6 :

18. IO::Socket::INET
method bind($host, $port) {
$!PIO.bind($!PIO.sockaddr($host, $port));
return self;
}

19. Plackdo::Socket
method bind(Str $host, Int $port) {
my $sockaddr = self.sockaddr($host, $port);
my $status = 0;
try {
$!PIO.bind(pir::descalarref__PP($sockaddr));
CATCH {
default { $status = 1; }
}
}
return $status;
}

20. Plackdo::Socket
method sockaddr(Str $host, Int $port) {
Q:PIR {
.local pmc self, pio, host, port, sockaddr
self = find_lex 'self'
pio = getattribute self, '$!PIO'
host = find_lex '$host'
port = find_lex '$port'
sockaddr = pio.'sockaddr'(host, port)
%r = sockaddr
};
}

21. http server
• adding http specific codes onto echo server
• basically copied from HTTP::Server::PSGI
show codes here

22. parsing requests
• Plackdo::HTTP::Message
• based on HTTP::Message on perl 5
• using grammar on perl 6 show codes here

23. Middlewares
• copied from Plack::Middleware
• AccessLog
• Static
• Conditional show codes here

24. testing
• Plackdo::Test
• forking server inside
• mocking http response without forking

25. forking
• no forking in rakudo core currently
• use zavolaj
• multi-platform problem show codes here

26. distributing
• ufo
• neutro
• http://modules.perl6.org/

27. making blog
• input
• storing entries
• html
• rss

28. using databases
• MiniDBI, MiniDBD::mysql
• libmysqlclient via zavolaj, nci

29. using libraries
• zavolaj
• nci (Native Call Interface) on parrot

30. html building
• XML::Writer
• building RSS in same way

31. XML::Writer
my $html = html => [
head => [
title => [‘my first html’],
],
body => [‘hello world’],
];
XML::Writer.serialize($html);

32. rakudo things
• rakudo* was released every month (2010)
• next rakudo* will be released in April
• you can get rakudo (not star) from github

33. parrot things
• parrot development is very active
• interfaces change so often

34. to adjust to changes
• implement core of your apps by your hand
• give feedbacks to developer community

35. pir
• parrot intermediate representation
• pir is fast!

36. pir
my $res = Q:PIR {
....
};

37. my todo
• error handling
• Session management
• better mysql client (MiniDBD::mysql)
• Text::Markdown

38. conclusion
• if you want to reinvent wheels,
consider do it with rakudo
• it will help you understand more deeply
your first language.

39. that’s all
• Thank you!
• PLEASE COME TO JAPAN after the
nuclear problem ended (in HAPPY END)!