NAME

Tatsumaki - Non-blocking web framework based on Plack and AnyEvent

SYNOPSIS

### app.psgi

use Tatsumaki::Error;

use Tatsumaki::Application;

use Tatsumaki::HTTPClient;

use Tatsumaki::Server;

package MainHandler;

use parent qw(Tatsumaki::Handler);

sub get {

my $self = shift;

$self->write("Hello World");

}

package FeedHandler;

use parent qw(Tatsumaki::Handler);

__PACKAGE__->asynchronous(1);

use JSON;

sub get {

my($self, $query) = @_;

my $client = Tatsumaki::HTTPClient->new;

$client->get("http://friendfeed-api.com/v2/feed/$query", $self->async_cb(sub { $self->on_response(@_) }));

}

sub on_response {

my($self, $res) = @_;

if ($res->is_error) {

Tatsumaki::Error::HTTP->throw(500);

}

my $json = JSON::decode_json($res->content);

$self->write("Fetched " . scalar(@{$json->{entries}}) . " entries from API");

$self->finish;

}

package StreamWriter;

use parent qw(Tatsumaki::Handler);

__PACKAGE__->asynchronous(1);

use AnyEvent;

sub get {

my $self = shift;

$self->response->content_type('text/plain');

my $try = 0;

my $t; $t = AE::timer 0, 0.1, sub {

$self->stream_write("Current UNIX time is " . time . "\n");

if ($try++ >= 10) {

undef $t;

$self->finish;

}

};

}

package main;

my $app = Tatsumaki::Application->new([

'/stream' => 'StreamWriter',

'/feed/(\w+)' => 'FeedHandler',

'/' => 'MainHandler',

]);

return $app->psgi_app;

And now run it with:

plackup -s Twiggy app.psgi

WARNINGS

This is considered as alpha quality software. Most of the stuff are

undocumented since it's considered unstable and will likely to change.

You should sometimes look at the source code or example apps in *eg*

directory to see how this thing works.

Feel free to hack on it and ask me if you have questions or suggestions

at IRC: #plack on irc.perl.org.

DESCRIPTION

Tatsumaki is a toy port of Tornado for Perl using Plack (with

non-blocking extensions) and AnyEvent.

It allows you to write a web application that does a immediate response

with template rendering, IO-bound delayed response (like fetching third

party API or XML feeds), server push streaming and long-poll Comet in a

clean unified API.

PSGI COMPATIBILITY

When "asynchronous" is declared in your application, you need a PSGI

server backend that supports "psgi.streaming" response style. If your

application does server push with "stream_write", you need a server that

supports "psgi.nonblocking" (and "psgi.streaming") as well.

Currently Tatsumaki asynchronous application is supposed to run on

Twiggy, Feersum, Corona and POE::Component::Server::PSGI.

If "asynchronous" is not used, your application is supposed to run in

any PSGI standard environments, including blocking multiprocess

environments like Starman or Starlet.

TATSUMAKI?

Tatsumaki is a Japanese for Tornado. Also, it might sound familiar from

"Tatsumaki Senpuukyaku" of Ryu from Street Fighter II if you loved the

Capcom videogame back in the day :)

AUTHOR

Tatsuhiko Miyagawa <[email protected]>

LICENSE

This library is free software; you can redistribute it and/or modify it

under the same terms as Perl itself.

SEE ALSO

AnyEvent Plack PSGI