An Introduction to Faye

Faye
simple pub/sub messaging
http://faye.jcoglan.com/

• Publish-subscribe messaging system
• Based on the Bayeux protocol
• Servers/clients in Ruby and Javascript

npm install faye

gem install faye

var Faye = require('faye')
var server = new Faye.NodeAdapter({ mount: '/faye' })

server.listen(8000)

require 'faye'

server = Faye::RackAdapter.new(:mount => '/faye')
server.listen(8000)

var client = new Faye.Client('http://localhost:8000/faye')

// subscribe to a channel
client.subscribe('/messages', function(message) {
console.log('We got a message: ' + message.text)
})

// publish to a channel
client.publish('/messages', {
text: 'HAI!'
})

require 'faye'
require 'eventmachine'

EM.run {
client = Faye::Client.new('http://localhost:8000/faye')

# subscribe to a channel
client.subscribe('/messages') do |message|
puts message.inspect
end

# publish to a channel
client.publish('/messages', { 'text' => 'HAI!' })
}

• Simple chat-room application
• Sinatra
• Faye

require 'sinatra'

get '/' do
erb :index
end

server.listen(8000)

<!DOCTYPE html>
<html>
<head>
<title>Chattr</title>
<link rel="stylesheet" href="chattr.css" type="text/css" media="screen" />
</head>
<body>
<h1>Lets Chat...</h1>

<ul id="chat"></ul>
<form id="new_message" action="#" method="get" accept-charset="utf-8">
<input type="text" name="message" id="message" value="" />
<input type="submit" name="send" id="send" value="Send" />
</form>

<script src="jquery.min.js" charset="utf-8"></script>
<script src="http://localhost:8000/faye/client.js" charset="utf-8"></script>
<script src="chattr.js" charset="utf-8"></script>
</body>
</html>


// Publish a message...
$('#new_message').bind('submit',function() {
var now = new Date()
var message = {
content: $('#message').val(),
timestamp: now.getHours() + ":" + now.getMinutes()
}

client.publish('/messages', message)
$('#message').val('')
return false
})

// Subscribe to message feed...
var str = ''
str += '<li>'
str += ' <span class="created_at">'+ message.timestamp +'</span>'
str += ' '+ message.content
str += '</li>'

$('#chat').append(str)
})

Events

• handshake
• subscribe
• unsubscribe
• publish
• disconnect

server.listen(8000)

server.bind('handshake', function(client_id) {
console.log("[handshake] - client: '"+ client_id +"'")
})

server.bind('subscribe', function(client_id, channel) {
console.log("[subscribe] - client: '"+ client_id +"', channel: '"+ channel +"'")
})

server.bind('unsubscribe', function(client_id, channel) {
console.log("[unsubscribe] - client: '"+ client_id +"', channel: '"+ channel
+"'")
})

server.bind('publish', function(client_id, channel, data) {
console.log("[publish] - client: '"+ client_id +"', channel: '"+ channel +"'")
console.log("[publish] - data:")
console.log(data)
})

server.bind('disconnect', function(client_id) {
console.log("[disconnect] - client: '"+ client_id +"'")
})

require 'faye'
require 'logger'

Faye::WebSocket.load_adapter('thin')
faye = Faye::RackAdapter.new(:mount => '/faye', :timeout => 25)

log = Logger.new(STDOUT)
log.level = Logger::INFO

faye.bind(:handshake) do |client_id|
log.info("[handshake] - client: '#{client_id}'")
end

faye.bind(:subscribe) do |client_id,channel|
log.info("[subscribe] - client: '#{client_id}', channel: '#{channel}'")
end

faye.bind(:unsubscribe) do |client_id,channel|
log.info("[unsubscribe] - client: '#{client_id}', channel: '#{channel}'")
end

faye.bind(:publish) do |client_id,channel,data|
log.info("[publish] - client: '#{client_id}', channel: '#{channel}', data: '#
{data.inspect}'")
end

faye.bind(:disconnect) do |client_id|
log.info("[disconnect] - client: '#{client_id}'")
end

run faye

Extensions

• Override default behaviour...
• incoming()
• outgoing()

Engines

• Change the back-end...
• faye-redis

var faye = require('faye')
var faye_redis = require('faye-redis')

var server = new faye.NodeAdapter({
mount: '/faye',
timeout: 25,
engine: {
type: faye_redis,
host: 'localhost',
port: 6379
}
})
server.listen(8000)

require 'faye'
require 'faye-redis'

server = Faye::RackAdapter.new(
:mount => '/faye',
:timeout => 25,
:engine => {
:type => Faye::Redis,
:host => 'localhost',
:port => 6379
}
)
server.listen(8000)

An Introduction to Faye

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