XMPP & AMQP in Ruby

XMPP & AMQP Asynchronous, Event-Driven Messaging

Technologies

XMPP Extensible Messaging and Presence Protocol Core of Jabber IM technology http://xmpp.org AMQP Advanced Message Queuing Protocol An Open Standard for Messaging Middleware http://amqp.org

Services RabbitMQ http://rabbitmq.com ejabberd http://jabber.im

Libraries tmm1-amqp http://github.com/tmm1/amqp xmpp4r-simple http://github.com/blaine/xmpp4r-simple

Purpose

Message Process 1 Process 2

? Message Process 1 Process 2

Cross-Process Messaging DRb (and Rinda) HTTP MySQL PStore AMQP

Cross-Process Messaging Ruby only DRb (and Rinda) client HTTP & server artiﬁcial MySQL solution naive PStore AMQP

Cross-Process Messaging AMQP designed for multiprocess messaging with a generic, extensible protocol

A Message Is an object of communication Any type of transmission, including marshaled Ruby objects (in JSON, for instance)

Messages # essentially Base64.encode(m.to_json) require 'json' # message = {quot;namequot; => quot;Bobquot;} payload = [message.to_json].pack(quot;m*quot;)

Messages # essentially JSON.parse(Base64.decode(p)) require 'json' # payload = quot;eyJuYW1lIjoiQm9iIn0=quot; message = JSON.load(payload.unpack(quot;m*quot;).first)

Libraries require 'rubygems' gem quot;eventmachinequot;, quot;0.12.2quot; gem quot;tmm1-amqpquot;, quot;0.6.0quot; require 'mq'

Queueing Messages EM.run do mq = MQ.new q = mq.queue('noises') q.publish('moo') end

Queueing Messages (simpliﬁed) EM.run do MQ.new.queue('noises').publish('moo') end

Subscribing to Queues EM.run do MQ.new.queue('noises').subscribe do |msg| puts msg end end

Full Example mq = MQ.new q = mq.queue('noises') q.subscribe do |msg| puts quot;Got: %squot; % msg.inspect end q.publish('moo')

Starting the EventMachine Reactor # required Thread.new{ EM.run{} } # optional for clean shutdown %w(INT TERM).each{ |sig| old = trap(sig){ EM.stop old.call if old.respond_to? :call } }

QUEUE MESSAGE! Process 1 Process 1 Msg NOTIFY SUBSCRIBER! RabbitMQ Msg Msg SUBSCRIBE Msg TO QUEUE! Process 2 Process 2

Purpose

Message Machine 1 Machine 2

? Message Machine 1 Machine 2

XMPP Message Message Delivery Machine 1 Machine 2 Identity Identity Persistent Connections Presence (State) Rosters (Friends)

Libraries require 'rubygems' gem quot;eventmachinequot;, quot;0.12.2quot; gem quot;xmpp4r-simplequot;, quot;0.8.8quot; require 'xmpp4r-simple'

Logging On client = Jabber::Simple.new(quot;test@example.comquot;, quot;passwordquot;)

Sending Messages client.deliver(quot;test@example.netquot;, quot;OH HAIquot;)

Receiving Messages client.received_messages do |msg| puts quot;From: %squot; % msg.from.to_s puts msg.body puts end

Handling Status Updates client.presence_updates do |jid, presence, msg| puts quot;%s is now %s (%s)quot; % [jid.to_s, presence, message] end

XMPP+AMQP

Event-Driven Architecture

Purpose

AMQP XMPP Process queue Msg 1 Machine Machine message 1 2..n subscriber AMQP notiﬁed RabbitMQ Process Process 2 XMPP 3..n message ejabberd message sent delivered

Similarities AMQP RabbitMQ XMPP ejabberd Erlang Ruby libraries asynchronous standardized local/remote extensible clusterable ofﬂine message queue

Differences AMQP RabbitMQ XMPP ejabberd binary transfer XML transfer faster slower push/pull push no presence presence subscribers members/rosters message ﬁdelity persistent conn.

Rails Plugin require 'json' require 'mq' Thread.new{ EM.run{} } class Foo # queues message to be handed to external process def self.queue(message) payload = [message.to_json].pack(“m*”) MQ.new.queue('messages').publish(payload) end end

Background Process/Task require 'mq' require 'xmpp4r-simple' Thread.new{ EM.run{} } class Foo # redirect payload to recipient for processing def self.run @client ||= Jabber::Simple.new(quot;test@example.comquot;, quot;passwordquot;) MQ.new.queue('messages').subscribe do |payload| @client.deliver(@recipient, payload) end end end

External Process require 'json' require 'xmpp4r-simple' class Foo # periodically checks for and handles any messages def self.run @client ||= Jabber::Simple.new(quot;test@example.comquot;, quot;passwordquot;) EM.add_periodic_timer(3) do @client.received_messages do |msg| payload = msg.body message = JSON.load(payload.unpack(quot;m*quot;).first) # do something with message end end end end

Summary

use whichever you prefer and meets your needs use existing solution, don’t write what you don’t have to don’t be afraid to combine them have fun, experiment, fuck up

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XMPP & AMQP in Ruby

by Matt Todd on Apr 08, 2009

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XMPP & AMQP in Ruby — Presentation Transcript