From 8ddf2e94df70707b458528a437759b96046d3e01 Mon Sep 17 00:00:00 2001
From: Franck Cuny <franck.cuny@gmail.com>
Date: Tue, 26 Nov 2013 10:36:10 -0800
Subject: Huge update.

Moved all posts from textile to markdown. Updated all the CSS and
styles. Added a new page for the resume.
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 ...te-a-nice-webapp-in-less-than-two-hours.textile | 102 ---------------------
 1 file changed, 102 deletions(-)
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diff --git a/_posts/2009-12-21-tatsumaki-or-how-to-write-a-nice-webapp-in-less-than-two-hours.textile b/_posts/2009-12-21-tatsumaki-or-how-to-write-a-nice-webapp-in-less-than-two-hours.textile
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----
-layout: post
-category: perl
-title: Tatsumaki, or how to write a nice webapp in less than two hours
----
-
-Until today, I had a script named "lifestream.pl". This script was triggered via cron once every hour, to fetch various feeds from services I use (like <a href="http://github.com/">github</a>, <a href="http://identi.ca/">identi.ca</a>, ...) and to process the result through a template and dump the result in a HTML file.
-
-Today I was reading <a href="http://github.com/miyagawa/Tatsumaki">Tatsumaki's code</a> and some examples (<a href="http://github.com/gugod/Social">Social</a> and <a href="http://github.com/miyagawa/Subfeedr">Subfeedr</a>). Tatsumaki is a "port" <a href="http://www.tornadoweb.org/">tornado</a> (a non blocking server in Python), based on Plack and AnyEvent. I though that using this to replace my old lifestream script would be a good way to test it. Two hours later I have a complete webapp that works (and the code is available <a href="http://github.com/franckcuny/lifestream">here</a>).
-
-The code is really simple: first, I define an handler for my HTTP request. As I have only one things to do (display entries), the handler is really simple:
-
-{% highlight perl %}
-package Lifestream::Handler;
-use Moose;
-extends 'Tatsumaki::Handler';
-
-sub get {
-    my $self   = shift;
-    my %params = %{$self->request->params};
-    $self->render(
-        'lifestream.html',
-        {   memes    => $self->application->memes($params{page}),
-            services => $self->application->services
-        }
-    );
-}
-1;
-{% endhighlight %}
-
-For all the get request, 2 methods are called : <strong>memes</strong> and <strong>services</strong>. The <strong>memes</strong> get a list of memes to display on the page. The services get the list of the various services I use (to display them on a sidebar).
-
-Now, as I don't want to have anymore my lifestream.pl script in cron, I will let Tatsumaki do the polling. For this, I add a service to my app, which is just a worker.
-
-{% highlight perl %}
-package Lifestream::Worker;
-use Moose;
-extends 'Tatsumaki::Service';
-use Tatsumaki::HTTPClient;
-
-sub start {
-    my $self = shift;
-    my $t;
-    $t = AE::timer 0, 1800, sub {
-        scalar $t;
-        $self->fetch_feeds;
-    };
-}
-
-sub fetch_feeds {
-    my ($self, $url) = @_;
-    Tatsumaki::HTTPClient->new->get(
-        $url,
-        sub {
-            #do the fetch and parsing stuff
-        }
-    );
-}
-{% endhighlight %}
-
-From now, every 60 minutes, feeds will be checked. Tatsumaki::HTTPClient is a HTTP client based on AnyEvent::HTTP.
-
-Let's write the app now
-
-{% highlight perl %}
-package Lifestream;
-
-use Moose;
-extends "Tatsumaki::Application";
-
-use Lifestream::Handler;
-use Lifestream::Worker;
-
-sub app {
-    my ($class, %args) = @_;
-    my $self = $class->new(['/' => 'Lifestream::Handler',]);
-    $self->config($args{config});
-    $self->add_service(Lifestream::Worker->new(config => $self->config));
-    $self;
-}
-
-sub memes {
-}
-
-sub services {
-}
-{% endhighlight %}
-
-The <strong>memes</strong> and <strong>services</strong> method called from the handler are defined here. In the app method, I "attch" the "/" path to the handler, and I add the service.
-
-and to launch the app
-
-{% highlight perl %}
-my $app = Lifestream->app(config => LoadFile($config));
-require Tatsumaki::Server;
-Tatsumaki::Server->new(
-    port => 9999,
-    host => 0,
-)->run($app);
-{% endhighlight %}
-
-And that's it, I now have a nice webapp, with something like only 200 LOC. I will keep playing with <a href="http://www.slideshare.net/miyagawa/tatsumaki">Tatsumaki</a> as I have more ideas (and probably subfeedr too). Thanks to <a href="http://bulknews.typepad.com/">miyagawa</a> for all this code.
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