Mojo as a_client

Mojo as a HTTP A new beginning

I am Marcus I work here

In the beginning there was LWP

First Changelog Entry: Thu 18 May 1995 Martijn Koster <m.koster@nexor.co.uk> o Mentioned on libwww-perl that I had changed the classes around lots.

Became wildly popular, default choice for HTTP in Perl.

Starting to show it’s age

Clunky API No Async No Web Socket ...

The time is ripe for a new beginning.

perl -Mojo -e' g("vg.no/") ->dom(".article-content h3 a") ->each(sub { b(shift->text) ->decode->say })'

Actually, it didn’t happen just like that.

Sebastian Riedel @kraih

Took over Maypole. Wanted to make radical changes

Got Booted

Created Catalyst. Wanted to make radical changes

Got Booted

Made Mojolicious. Wanted to target PHP developers & Perl 6

Ease of install/porting ➜ Only Perl5 core dependencies

Bootstrapping: curl -L cpanmin.us | sudo perl - Mojolicious

Wrote an async HTTP 1.1 compliant stack

Mojo::Transaction Mojo::Message::Response Mojo::Cookie Mojo::URL +++

Test Driven Development

RFC Driven Development

PRAGMATIC

Next logical step: Add a client on top of this stack.

Mojo == Lego Built from reusable bricks.

Parallel requests

my $callback = sub { print shift−>res−>body }; $client−>get('http://mojolicious.org' => $callback); $client−>get('http://search.cpan.org' => $callback); $client−>start;

Form Handling

# Form post with exception handling my $cpan = 'http://search.cpan.org/search'; my $search = {q => 'mojo'}; my $tx = $client−>post_form($cpan => $search); if (my $res = $tx−>success) { print $res−>body } else { my ($message, $code) = $tx−>error; print "Error: $message"; }

Web Sockets

$client−>websocket( 'ws://websockets.org:8787' => sub { my $client = shift; $client−>on_message( sub { my ($client, $message) = @_; print "$messagen"; $client−>ﬁnish; }); $client−>send_message('hiya!'); })−>start;

Oneliners

Collection of single letter commands.

g ➜ get d ➜ delete f ➜ form post p ➜ post u ➜ put w ➜ websocket

Special Cases b ➜ byte stream, a ➜ Lite app

#ojo module my $res = g( 'http://mojolicio.us', {'Content−Type' => 'text/plain'}, 'Hello!' ); perl -Mojo -e 'b(g("mojolicio.us")->dom->at("title")->text)->say' perl -Mojo -E'g("bloomberg.com")->dom("a.story_link")->each(sub { say shift->text; })' perl -Mojo -E'g("digg.com")->dom("a.story-title")->each(sub { say pop, ". ", shift->text })' # Undocumented o(fun) Mojolicious cloud function: perl -Mojo -e 'oO("http://www.reddit.com")->dom->ﬁnd("a.title")- >each(sub { Oo(pop . ". " . shift->text)->say })'

Mojo::DOM

Liberal XML Parser

Supports all CSS3 selectors that make sense

* E[foo=”bar”] E:checked E:empty E:nth-child E:ﬁrst-of-type E:not(s) EF E>F ++++

o(fun) If you need performance use libXML

SOME RANDOM BITS

Supports IPV6, TLS,proxies, epoll, kqueue

DEBUG MODE ENV VARIABLE MOJO_CLIENT_DEBUG=1 perl -Mojo -E’...’

# Streaming response my $tx = $client−>build_tx(GET => 'http://mojolicious.org'); $tx−>res−>body(sub { print $_[1] }); $client−>start($tx); # Custom socket my $tx = $client−>build_tx(GET => 'http://mojolicious.org'); $tx−>connection($socket); $client−>start($tx);

Big Body Just Works (temp storage on ﬁlesystem)

$res->json Automatic JSON deserialization

o(fun) Every ﬁle in the distro has a Simpsons or Futurama quote.

Now also handles disconnected keep-alive gracefully. (this was not the case when we started using it).

Test Driven Development

You provide failing test. kraih provides ﬁx.

Learn More Mojo mojolicious.org github.com/kraih/mojo #mojo on irc.perl.org groups.google.com/group/mojolicious

Mojo as a_client

by Marcus Ramberg

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