la runeta se agita

VID00030

Fri, 01 May 2009 16:16:22 -0300

leon cuenta chistes

Fri, 01 May 2009 16:16:22 -0300

Particionar el cache del ActiveSupport::Cache::FileStore

Tue, 03 Mar 2009 12:39:00 -0400

Para un sitio con mucho trafico (tipo Sumavisos en un tiempo :) y muchos objetos distintos cacheados, el comportamiento por defecto del ActiveSupport::Cache::FileStore deja mucho que desear: como guarda todos los archivos al mismo directorio, uno puede facilmente terminar con un directorio con 100.000 archivos.

Entonces, el filesystem sufre cuando el ActiveSupport quiere chequear si tal cache-archivo existe y si existe abrirlo. Para eso, monkeypatcheamos un poquito el FileStore para que particione los caches en distintos directorios.

De esta manera los archivos quedan distribuidos en distintos directorios y el lookup deberia ser mas rapido.

Magia Ruby + Magia Rails, poner esto en algun lugar (por ejemplo, /config/initializers)

class ActiveSupport::Cache::FileStore
	  def real_file_path_with_partition(name)
	  	real_file_path_without_partition(partition_cache_key(name))
	  end
	  def partition_cache_key(name)
	  	k = MD5.hexdigest(name)
	  	key =  k[1 .. 1]  + "/" 
		key += k[2 .. 2] + "/" 
		key += k[3 .. 3] + "/" 
		key += k[4 .. 4] + "/" 
		key += k[5 .. 5] + "/" 
		return key + name 
	  end
	  alias_method_chain :real_file_path,:partition
end

Nota, esta version del codigo no es la original. Esta esta mucho mejor y anda con el TimedFileStore que permite expirar el cache segun su antiguedad

"This is a talk I gave last year at RubyFringe, about the whole process of me and my wife selling our..."

Tue, 03 Mar 2009 09:15:41 -0400

“This is a talk I gave last year at RubyFringe, about the whole process of me and my wife selling our house and living off savings to create CouchDB.”

- Damien Katz: CouchDB and Me

trackear los links salientes con analytics

Wed, 07 Jan 2009 10:31:54 -0400

Esto es una boludez y da info muy interesante.

Basicamente se modifican todos los links “salientes” del documento para que onclick llamen a la funcion de Analytics que trackea una pagina:

pageTracker._trackPageview(‘/outgoing/’+e.href)

Si vd tiene un dojo ahi se hace asi:

dojo.query(“a”).forEach(function(e){

if (e.href.length > 0 && e.href.indexOf(window.location.hostname) == -1){

dojo.connect(e,”click”,function() {

pageTracker._trackPageview(‘/outgoing/’+e.href);

});

}

})

Tambien hay una mencion en el help de Analytics

Breve bookmarklet para limpiar el dise#o nuevo de Clarin.com

Fri, 12 Dec 2008 11:50:00 -0400

Dragandrop a la barra de bookmarks:

LimpiarClarin

se puede hacer lo mismo con flashblock y amigos; es algo salvaje.

laramango.avi

Sun, 07 Dec 2008 02:30:12 -0400

laramango.avi

Geonames Hierarchy

Mon, 01 Dec 2008 17:19:40 -0400

In case you’re wondering how to get the hierarchy of a Geonames place, this is my recipe. As per Marc suggestion, I preprocessed the Geonames dump and fill a table with some handy columns and indexes.

You’ll get with something like this:

mysql> select * from places_preprocessed where name=’Almagro’\G
*************************** 1. row ***************************
id: 3436397
name: Almagro
alternames:
ansiname: Almagro
lat: -34.6
lon: -58.4166667
parent_ids: |3865483|3433955|3436397|
parent_names: |Argentine Republic|Distrito Federal|Almagro|
feature_code: PPLX
depth: 3

The following code is in Ruby, using Activerecord.

There’re 2 tables, “geonames” which holds the Geonames dump and “places_preprocessed” with the result data.

CREATE TABLE `geonames` (
`id` int(10) unsigned NOT NULL,
`name` varchar(200) NOT NULL default ”,
`ansiname` varchar(200) NOT NULL default ”,
`alternames` varchar(2000) NOT NULL default ”,
`latitude` double NOT NULL default ‘0’,
`longitude` double NOT NULL default ‘0’,
`feature_class` char(1) default NULL,
`feature_code` varchar(10) default NULL,
`country_code` char(2) default NULL,
`cc2` varchar(60) default NULL,
`admin1_code` varchar(20) default ”,
`admin2_code` varchar(80) default ”,
`admin3_code` varchar(20) default ”,
`admin4_code` varchar(20) default ”,
`population` int(11) default ‘0’,
`elevation` int(11) default ‘0’,
`gtopo30` int(11) default ‘0’,
`timezone` varchar(40) default NULL,
`modification_date` date default ‘0000-00-00’,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8

CREATE TABLE `places_preprocessed` (
`id` int(10) unsigned NOT NULL,
`name` varchar(200) default NULL,
`alternames` varchar(255) default NULL,
`ansiname` varchar(200) default NULL,
`lat` double default NULL,
`lon` double default NULL,
`parent_ids` varchar(200) default NULL,
`parent_names` tinytext,
`feature_code` varchar(10) default NULL,
`depth` smallint(6) NOT NULL,
PRIMARY KEY (`id`),
KEY `parent_ids` (`parent_ids`),
KEY `feature_code` (`feature_code`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1

And now, the code:

class Geonames < ActiveRecord::Base
FEATURE_CLASS_HIERARCHY=[‘ADM1’, ‘ADM2’, ‘ADM3’, ‘ADM4’, ‘ADMD’, ‘LTER’, ‘PCL’, ‘PCLD’, ‘PCLF’, ‘PCLI’, ‘PCLI’, ‘PCLS’, ‘PRSH’, ‘TERR’, ‘ZN’, ‘ZNB’]
MAIN_HIERARCHY=[ ‘PCLI’,’ADM1’, ‘ADM2’, ‘ADM3’, ‘ADM4’,[‘PPLC’,’PPLA’,’PPLX’]]
def find_main_children
pos = MAIN_HIERARCHY.index(self.feature_code)
return [] if not pos
next_feature_codes = MAIN_HIERARCHY[pos + 1 .. -1]
puts “Children codes: #{next_feature_codes.inspect} (current fcode: #{self.feature_code})”
r = []
next_feature_codes.each { |next_feature_code|
if next_feature_code
puts “Finding children with code #{next_feature_code}”
sql = “country_code = ? and admin2_code = ? and admin3_code = ? and admin4_code = ? and feature_code in (?)”
param = [self.country_code, self.admin2_code,self.admin3_code,self.admin4_code,next_feature_code]
if self.admin1_code and self.admin1_code != ‘00’
sql += ” and admin1_code = ? “
param « self.admin1_code
end
puts “** SQL: #{sql} p: #{param.inspect}”
r = Geonames.find(:all,:conditions => [sql, *param])
return r if not r.empty?
end
}
r
end
def find_children
next_feature_code = FEATURE_CLASS_HIERARCHY[FEATURE_CLASS_HIERARCHY.index(self.feature_code) + 1]
Geonames.find(:all,:conditions => [“country_code = ? and admin1_code = ? and admin2_code = ? and admin3_code = ? and admin4_code = ? and feature_code in (?)”,self.country_code, self.admin1_code,self.admin2_code,self.admin3_code,self.admin4_code,next_feature_code]) if next_feature_code
end
def parent
FEATURE_CLASS_HIERARCHY.reverse.each{ |feature_code|
break if feature_code == self.feature_code
place = Geonames.find(:first,:conditions => [“country_code = ? and admin1_code = ? and admin2_code = ? and admin3_code = ? and admin4_code = ? and feature_code = ? “,country_code, admin1_code, admin2_code, admin3_code, admin4_code, feature_code]);
return place if place
}
end
end

And the code to preprocess:

class Place < ActiveRecord::Base
set_table_name :places_preprocessed;
has_many :properties
def self.preprocess
ActiveRecord::Base.connection.execute(“TRUNCATE TABLE `#{table_name}`”);
Geonames.find(:all, :conditions => “feature_code = ‘PCLI’ and feature_class = ‘A’ and admin1_code = ‘00’”).each{ |country|
Place.preprocess_place(country)
}
end
def self.preprocess_place(place, parent = nil, pad = ”)
puts pad + “Preprocess place: #{place.inspect}”
parent = parent || place.parent
puts pad + ” * parent is: #{parent}”
if parent and parent.is_a?(Place)
parent_ids = parent.parent_ids
parent_names = parent.parent_names
depth = parent.depth
else
parent_ids = “|”
parent_names = “|”
depth = 0
end
preprocessed = Place.new
preprocessed.id = place.id
preprocessed.name = place.name;
preprocessed.feature_code = place.feature_code
preprocessed.lat = place.latitude
preprocessed.lon = place.longitude
preprocessed.parent_ids = parent_ids + place.id.to_s + “|”
preprocessed.parent_names = parent_names + preprocessed.name + “|”
preprocessed.alternames = place.alternames
preprocessed.ansiname = place.ansiname
preprocessed.depth = depth + 1
puts pad + ” * presave #{preprocessed}”
preprocessed.save()
puts pad + ” * processing children… “
children = place.find_main_children
puts pad + ” * found #{children.length} children”
children.each{|child|
begin
Place.find(child.id)
puts pad + ” * #{child.to_s} (#{child.id}) already processed!”
rescue
Place.preprocess_place(child, preprocessed, pad + ‘ ‘)
end
}
end
end

Usage, just run:

Place.preprocess()

fede al agua

Thu, 06 Nov 2008 13:41:19 -0400

fede al agua

"However, I think most people just make the mistake that it should be simple to design simple things...."

Tue, 28 Oct 2008 11:08:21 -0300

“However, I think most people just make the mistake that it should be simple to design simple things. In reality, the effort required to design something is inversely proportional to the simplicity of the result. As architectural styles go, REST is very simple.”

- REST APIs must be hypertext-driven » Untangled

Seinfeld - Serenity Now Montage (via eilgenfritz)

Wed, 10 Sep 2008 16:11:29 -0300

Seinfeld - Serenity Now Montage (via eilgenfritz)

"Fanny and Freddy podría haber sido el título de una comedia protagonizada por una simpática parejita..."

Wed, 10 Sep 2008 12:46:03 -0300

“Fanny and Freddy podría haber sido el título de una comedia protagonizada por una simpática parejita de niños traviesos o un thriller de dos jóvenes asaltantes de bancos. Pero no. Fannie Mae y Freddie Mac son los nombres con los que se conoce hoy a las dos entidades de crédito que están haciendo temblar el sistema financiero mundial. El salvavidas de rescate que les lanzó el Tesoro de los Estados Unidos es de 200 mil millones de dólares. El monto de las hipotecas comprometidas asciende a más de 5 billones de dólares, algo así como treinta veces la deuda pública argentina, y casi la mitad de los 12 billones de dólares de los préstamos inmobiliarios de todo el sistema financiero estadounidense. ¿Cómo hicieron para llegar a tanto dos entidades cuyos nombres son simples apodos diminutivos?”

- Página/12 :: Economía :: El que rompe, no paga

"Google also say they’re using a “multi-process design” which they say means “a bit more memory up..."

Thu, 04 Sep 2008 11:43:35 -0300

“Google also say they’re using a “multi-process design” which they say means “a bit more memory up front” but over time also “less memory bloat.” When web pages or plug-ins do use a lot of memory, you can spot them in Chrome’s task manager, “placing blame where blame belongs.”
[…]
By implementing this feature a browser is completely deflecting all memory or performance criticism off to individual site owners (“Yikes, my browser is using 300MB of memory! Actually it’s just youtube.com consuming 290MB of it, they should fix their web site!”). This is going to be a monumental shift in the responsibilities of web developers - and one that will serve the web better, as a whole.”

- John Resig - Google Chrome Process Manager

Casi funciona… For 11 days on the stand, Hans Reiser told...

Fri, 29 Aug 2008 11:29:42 -0300

Casi funciona…

For 11 days on the stand, Hans Reiser told Alameda County jurors to discount any guilty behavior he exhibited in the aftermath of his wife’s disappearance. After all, he said, he was a scientist, a misunderstood computer geek who stared at a computer screen for so long he hadn’t a clue of societal cues.

(via Hans Reiser Faces the Music Friday | Threat Level from Wired.com

)

Acentos y demas en Hpricot + UTF-8

Thu, 28 Aug 2008 21:13:39 -0300

Si usted esta, como yo, desesperado porque el Hpricot le devuelve signos de pregunta en vez de caracteres acentuados (aun cuando el doc es UTF-8), use esta asquerosidad:

require “htmlentities”
module Hpricot
class Elem
def inner_utext
coder = HTMLEntities.new
coder.decode(self.innerHTML)
end
end
end

Ahora puede hacer: doc.at(“#cosito”).inner_utext y le devuelve lo que usted andaba buscando. Algun dia, cuando el Hpricot funcione bien, cambia su inner_utext por “lo correcto”

Va a necesitar esto: HTML Entities for Ruby

Tips de Firebug para debuggear aplicaciones grandes

Tue, 26 Aug 2008 13:53:18 -0300

Antes que nada, usar siempre la ultima version en desarrollo de firebug (tiene mas bugs pero tambien mas features)

Hasta el Firebug 2.0 debuggear JS grandes es lentisimo, partirlos en cachitos
Cuando uno esta laburando con CSS y HTML y dandole poca bola al JS, lo mejor es desactivar los paneles de Net y Script; que segun mi experiencia es lo que hace lento al firebug
Tener 2 firefox abiertos al mismo tiempo, uno con un perfil “normal” y otro con un perfil de “dev”. El de “dev”, borrarlo cada dos por tres y crearlo de nuevo. Por alguna razon el firefox se pone lento (?)
El grupo de usuarios de firebug responde muy rapido
Algo basico pero vital: cuando uno esta debuggeando step-by-step la consola cambia al contexto donde esta la linea que se esta ejecutando. Hay bastante interaccion entre los distintos paneles (Console, Net y Script) aunque por la interface no parezca.

A mi, este discurso de Steve Jobs me rompe las pelotas. Es como...

Wed, 20 Aug 2008 15:26:18 -0300

A mi, este discurso de Steve Jobs me rompe las pelotas. Es como que es un tipo “buena onda” que te habla desde su corazon, que te dice “hace lo que sientas”. La parte oculta de esto es lo que sigue despues: “hace lo que sientas” (siempre que termines cambiando la tipografia de todas las computadoras del mundo).

Es como que nosotros lo escuchamos con mucha atencion y nos conmueve lo que dice, pero en realidad, lo que parece “genial” es que el hizo todo eso: y se hizo rico! y famoso! y es admirado por todo el mundo!

Yo podria decir lo mismo: “hace lo que tengas mas ganas”, pero claro, como yo no hice Pixar, a mi nadie me escucha. Tipico.

"The booth was simple in concept; students could bring their bibles (or any religious text..."

Fri, 15 Aug 2008 13:37:32 -0300

“The booth was simple in concept; students could bring their bibles (or any religious text whatsoever) to the booth, and receive pornography in exchange.”

- The Porno-for-Bibles Booth

"After Shigeru Miyamoto developed a love of puzzles, the “brain-training” software that..."

Wed, 13 Aug 2008 14:42:12 -0300

““After Shigeru Miyamoto developed a love of puzzles, the “brain-training” software that has proved to be an international “killer application” on the Nintendo DS console was born. He became interested in taking more exercise, and Wii Fit was created. He took up music lessons, and Wii Music was the result. Now, according to sources at Nintendo, the games designer has been banned by the company from speaking publicly about his hobbies.””

- Slashdot | Miyamoto ‘Banned’ From Talking About Hobbies

wiki.dbpedia.org : About

Wed, 13 Aug 2008 11:27:51 -0300

wiki.dbpedia.org : About:

Si yo tuviera que ponerle fichas a algo, se las pondria a la Dbpedia:

Project Overview

Wikipedia is the by far largest publicly available encyclopedia on the Web. Wikipedia editions are available in over 250 languages with the English one accounting for more than 2.18 million articles. Unfortunately, Wikipedia’s search capabilities are limited to full-text search, which allows very limited access to this valuable knowledge-base.

Semantic Web technologies enable expressive queries against structured and interlinked information on the Web. Unfortunately, there is not much RDF data online yet, and up-to-date terms and ontologies are missing for many application domains.

The DBpedia project helps resolve both issues by extracting structured information from Wikipedia and by making this information available on the Web.

The DBpedia data set currently provides information about more than 2.18 million “things”, including at least 80,000 persons, 293,000 places, 62,000 music albums, and 36,000 films. Altogether, the DBpedia data set consists of 218 million pieces of information (RDF triples).