Microblogging via XMPP

Microblogging with XMPP Real Time Web

Who am I? • Name: Stoyan Zhekov • Private: married, 3 kids (boys) • Work: Software Engineer • Contact: xmpp: //zh@jabber.jp

Today • XMPP (Jabber) • Microblogging • Microblogging with XMPP • My program - xmpp4r, ramaze, sequel • Questions

Why? • Web 3.0 ? - Real Time Web? • RSS is not enough (SUP) • XMPP (Jabber) • Webhooks

XMPP (Jabber)

London-Calcutta, message + reply (Peter Saint-Andre) • 1800: 2 years (ship) • 1914: 1 month (steamship) • 1950: 1 week (airmail) • 1980: 2 days (overnight mail) • 1994: 10 min (email) • 1999: 1 sec (IM)

XMPP (history) • 1998: Jeremie Miller - ICQ - AIM (perl) • 1999: First rellease • 2001: Jabber Software Fondation • 2004: XMPP RFCs (IETF)

What is XMPP? • JID: node@server/Resource • Open Protocol • Decentralized - no central server • RFC 3290 (core), 3291 (messaging) • XMPP extension protocols (XEP)

What is XMPP? (2) • Bidirectional, streaming XML • One ﬁrst level tag: <stream> • 3 second level tags: • <presence> - presence, subscribtion • <message> - asynchronous • <iq> - synchronous

XMPP Features • Build-in presence • One-to-one IM (u2u, a2u, a2a) • Groupchat • Geolocation • Security - SSL, TLS

Not only for geeks • 50 000+ servers, 50+ million users • Wall Street • US Department of Defense • Cisco, Google, Apple • NTT ?

You on XMPP • Free account - jabber.jp etc. • GTalk for domains • Install your own server: • ejabberd (erlang) - production • openﬁre (java) - easy to install / use

Libraries • For a lot of OSes and languages • loudmouth (C) • xiff (ﬂash) • smack (java) • xmpp4r (ruby)

Microblogging

Microblogging • Web 2.0 • What is it? • Status changes • Short notes (140 limit) • Media ﬁles

Big players • Twitter • Jaiku • identi.ca (laconi.ca) - OSS • Tumblr - http://tt.zhekov.net/ • FriendFeed, Lifestream.fm

Microblogging with XMPP http://www.microblog.org/

Almost Real Time • XMPP bots (Jaiku, Identi.ca, FriendFeed) • GNIP - http://www.gnipcentral.com/ • RSS-to-XMPP • http://notify.me/ • http://notiﬁxio.us/ (WP plugin)

Microblogging with XMPP • Web 3.0 (Real Time Web) • PubSub - XEP-0060 • BOSH - XEP-0124 • XEP-XXXX • ....

Too complicated :(

Am I stupid...? :(

My own program

Design • XMPP bot • Simple API • Simple web frontend • Models: juick.com , kwippy.com

Components • models.rb - connection to the DB • bot.rb - XMPP • api.rb - service, scaling • web.rb - browser view

Models • “Things” • User • Micro • “Relations” • Subscribe - User-to-User • Subscribe - User-to-Micro • Like - User-to-Micro

Relations (Sequel) class User < Sequel::Model(:users) one_to_many :micros do |ds| ds.ﬁlter(:parent_id => nil) end one_to_many :subs, :extend => UserFindOrCreate many_to_many :publishers, :class => :User, :join_table => :subs end

Ruby XMPP Libraries • xmpp4r - Roster, vCard etc. • xmpp4r-simple - easy to use • jabber4r - Thread based :(

XMPP Bot • http://tr.im/emxmpp (nutrun.com) • EventMachine - libevent, Deferrable • Plugins - http://tr.im/modular

Concurrency EM.run do EM::PeriodicTimer.new(1) do ... EM.spawn do worker = Worker.new worker.callback {jabber.deliver(message.from, quot;Donequot;)} worker.process end.notify ... end end class Worker include EM::Deferrable def process ... set_deferred_status :succeeded end end

Plugins 1/3 PluginFactory.load quot;pluginsquot; ... def PluginFactory.load( dirname ) Dir.open( dirname ).each do |fn| next unless ( fn =~ /[.]rb$/ ) require quot;#{dirname}/#{fn}quot; end end

Plugins 2/3 class Plugin include EM::Deferrable def process( args = {} ) sleep(0.05) set_deferred_status :succeeded end end

Plugins 3/3 class NickPlugin < Plugin def process(args = {}) begin ... set_deferred_status :succeeded rescue set_deferred_status :failed end end end class NickFactory < PluginFactory INFO=<<INFO verb: NICK author: Stoyan Zhekov description: Get or set the nickname for some user INFO def create() return NickPlugin.new() end end

Simple API (json) • /users - list of users • /user/<nick>/<secret> - info for user • /status/<nick>/<secret> - presence • /micros/<page>/<format> - list of micros • /micro/<id>/<secret> - micro + comments

Web (Ramaze) class MainController < Ramaze::Controller def u nick begin @user = User.ﬁnd_by_user(nick) subset = @user.micros.reverse @micros, @pager = paginate(subset, :limit => PAGE) rescue Exception => e ﬂash[:error] = quot;Error: #{e.to_s}quot; redirect :/, :status => 302 end end end

<Demo>

To Do • Commands parser - Ragel? • OAuth or http://xmppid.net/ • TokyoCabinet • XMPP Component - http://github.com/julien51/babylon • Real PubSub?

Conclusion • XMPP - good, open protocol • xmpp4r-simple - good, easy to use • eventmachine - good network library • sequel - good ORM • ramaze - good web apps framework

Questions?

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Microblogging via XMPP

by Stoyan Zhekov on Jan 31, 2009

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