Powering your website with realtime data

October 2011

Powering your website with
realtime data

Bert Van Hauwaert
bert@becoded.be - @tbotwit

Bert Van Hauwaert

• Live in Belgium

• Founder of be.coded

• Freelance web application developer & consultant

• ZCE 5.0

• Working on realtime auction sites

Overview

• The old days

• XMPP

• Install server

• Configure apache

• Libraries

• Examples

The old days

• <meta http-equiv=”refresh” content=”5” />

• <script >

• AJAX

XMPP: what

• Extensible Messaging and Presence Protocol

• Jabber

• XML

• Client - Server - Component

XMPP: stanzas

• <presence>

• <message>

• <iq>

XMPP: addressing

• JID (Jabber Identifier)

• Three main parts

• [ node "@" ] domain [ "/" resource ]

XMPP: extensions

• XMPP Extension Protocol - XEP

• http://xmpp.org/xmpp-protocols/xmpp-extensions/

XMPP: advantages

• Open

• Decentralized

• Secure

• Extensible

XMPP: disadvantages

• Statefulness

• Overhead

XMPP: example
<stream:stream>
<iq type="get" id="roster1">
<query xmlns:"jabber:iq:roster" />
</iq>

<presence />
<message to="attendees@zendcon.com"
from="bert@becoded.be/speakerroom"
type="chat">
<body>
I hope you will enjoy this talk
</body>
</message>
<presence>
<show>dnd</show>
<status>Giving a talk @ ZendCon</status>
</presence>
</stream:stream>

XMPP: example
<stream:stream>
</iq>
<presence />
type="chat">
<body>
</body>
</message>
<presence>
<show>dnd</show>
<status>Giving a talk @ ZendCon</status>
</presence>
</stream:stream>

XMPP: example
<stream:stream>
</iq>

<presence />
type="chat">
<body>
</body>
</message>
<presence>
<show>dnd</show>
<status>
Giving a talk @ ZendCon
</status>
</presence>
</stream:stream>

XMPP: XEP-0060 (1)

• PubSub (Publish / Subscribe)

• Bandwidth / resources

XMPP: XEP-0060 (2)

<iq
from="child@holiday.com/car"
id="ams9nz78"
to="pubsub.holiday.com"
type="set">
<pubsub xmlns="http://jabber.org/
protocol/pubsub">
<subscribe node="are-we-there-yet"
jid="child@holiday.com"/>
</pubsub>
</iq>

XMPP: XEP-0060 (3)

<iq
from="adult@holiday.com/car"
id="wmn78e45a" to="pubsub.holiday.com"
type="set">
<pubsub xmlns="http://jabber.org/protocol/pubsub">
<publish node="are-we-there-yet">
<item>
<there xmlns="http://holiday.com/there-yet"
status="true"/>
</item>
</publish>
</pubsub>
</iq>

XMPP: XEP-0060 (4)

<message from="pubsub.holiday.com"
to="child@holiday.com">
<event xmlns="http://jabber.org/protocol/pubsub#event">
<items node="are-we-there-yet">
<item id="ax78ui789q">
<there xmlns="http://holiday.com/there-yet"
status="true"/>
</item>
</items>
</event>
</message>

XMPP: XEP-0045 (1)

• MUC / Multi-User Chat

• “Multiplier”

XMPP: XEP-0045 (2)

<presence
from="user@domain.com/resource"
to="room@conference.muc.com/nickname">
<x xmlns=
"http://jabber.org/protocol/muc"/>
</presence>

XMPP: XEP-0045 (3)

<message to="room@conference.muc.com"
from="user@domain.com/resource"
type="groupchat ">
<body>Lorem Ipsum</body>
</message>

<message to="otherUser@domain.com/resource"
from="room@conference.muc.com/nickname"
type="groupchat ">
<body>Lorem Ipsum</body>
</message>

Install server: starting point

• Debian

• web server

• SQL database

• SSH server

Install server: apt sources

• apt-get install vim

• vim /etc/apt/sources.list
• deb http://ftp.belnet.be/debian/ squeeze main non-free
deb-src http://ftp.belnet.be/debian/ squeeze main
deb http://security.debian.org/ squeeze/updates main non-free
deb-src http://security.debian.org/ squeeze/updates main
deb http://packages.dotdeb.org stable all
deb-src http://packages.dotdeb.org stable all

Install server: prerequisites (1)

• wget http://www.dotdeb.org/dotdeb.gpg

• cat dotdeb.gpg | apt-key add -

• apt-get update

• apt-get install sun-java6-jre sun-java6-fonts ident2

Install server: prerequisites (2)

• apt-get install mysql-server mysql-client

• apt-get install php5 php5-cli php5-common php5-dev
php5-mysql php5-curl php-pear

• Database & user

Install server: Openfire (1)

• Openfire 3.7.0

• http://www.igniterealtime.org/projects/openfire/

• wget -O openfire_3.7.0_all.deb
http://www.igniterealtime.org/downloadServlet?
filename=openfire/openfire_3.7.0_all.deb

• dpkg -i openfire_3.7.0_all.deb


• http://[server-ip]:9090/


• Plugins

• User Service

• Monitoring Service

Configure apache: why (1)

Client - polling

ta

ta
ta

data
no da

no da
no da

Server

d ata
w
ne

data
Client - long polling

Configure apache: why (2)

• BOSH (Bidirectional streams Over Synchronous HTTP)

Configure apache: proxy (1)

• cd /etc/apache2/mods-enabled/

• ln -s ../mods-available/proxy.load

• ln -s ../mods-available/proxy_http.load

• ln -s ../mods-available/rewrite.load

Configure apache: proxy (2)
<VirtualHost *:80>
Options FollowSymLinks
ServerAdmin bert@becoded.be
ServerName xmpp.dev.becoded.be
ServerAlias static.xmpp.dev.becoded.be
# Indexes + Directory Root.
DirectoryIndex index.php
DocumentRoot /var/www/vhost/xmpp.dev.becoded.be/htdocs/public/
php_admin_value open_basedir ".:/var/www/vhost/xmpp.dev.becoded.be/htdocs:/var/www/library/Zend-latest/
library:../:/usr/share/php:/tmp"
php_value include_path ".:/var/www/vhost/xmpp.dev.becoded.be/htdocs:/var/www/library/Zend-latest/library:/usr/
share/php"
php_admin_value upload_tmp_dir "/tmp"
SetEnv APPLICATION_ENV development

# Logfiles
ErrorLog /var/www/vhost/xmpp.dev.becoded.be/logs/error.log
CustomLog /var/www/vhost/xmpp.dev.becoded.be/logs/access.log combined

# XMPP proxy rule
ProxyRequests Off
ProxyPass /bind http://127.0.0.1:7070/http-bind/
ProxyPassReverse /bind http://127.0.0.1:7070/http-bind/
</VirtualHost>

Libraries

• ZF - http://framework.zend.com

• jQuery - http://jquery.com/

• jQuery UI - http://jqueryui.com/

• XMPPHP - http://code.google.com/p/xmpphp

• Jaxl - http://jaxl.net

• Strophe.js - http://strophe.im

Libraries: XMPPHP

$connection = new XMPPHP_XMPP(
$host, $port,
$identifier->node,
$identifier->password,
$identifier->resource,
$domain,
$printlog,
$loglevel);
$connection->connect();
$connection->processUntil('session_start');
$connection->message('support@demo', 'Hello world');
$connection->disconnect();

Libraries: Jaxl
$connection = new JAXL(array(
'user' => $identifier->node,
'pass' => $identifier->password,
'host' => $host,

'domain' => $domain,
'port' => $port,

'authType' => 'PLAIN',
'logLevel' => $loglevel
));
$connection->addPlugin('jaxl_post_auth', '_postAuthHook');
$connection->startCore("stream");

public function _postAuthHook ($payload, $jaxl) {
$jaxl->sendMessage('support@demo', 'Hello world');
$jaxl->shutdown();
}

Libraries: Strophe.js
var connection = new Strophe.Connection('/bind');
connection.connect(
jid, password,
function (status) {
if (status == Strophe.Status.CONNECTED) {
var msg = $msg({
to : 'support@demo',
type : "chat"
}).c('body').t('Hello world');

connection.send(msg);
setTimeout(function () {
connection.disconnect();
}, 500);
}
});

Examples: messages

• Browser

• Log

• Adium

Example: IQ ping pong (1)
this.statusHandler = function (status) {
var me = this;
me.connection.addHandler(
function(msg) { //(Function) handler
return me.handlePong(msg);
},
null, //(String) ns
'iq', //(String) name
null, //(String) type
'pingPong'); //(String) id

me.sendPing(Strophe.getDomainFromJid(me.connection.jid));
}
};


this.sendPing = function (to)
{
var me = this; <iq
to='demo'
type='get'
var iq = $iq({
id='pingPong'
to to,
:
xmlns='jabber:client'>
type : 'get', <ping
id : 'pingPong' xmlns='urn:xmpp:ping'/>
}).c('ping', </iq>
{xmlns: 'urn:xmpp:ping'});

me.connection.send(iq);
};

this.handlePong = function (msg)
{
var me = this;
var objMsg = $(msg);
var from = objMsg.attr('from');
me.log('Receiving ' + objMsg.attr('type') +
' from "' + objMsg.attr('from') +
'" with id "' + objMsg.attr('id') + '"');
me.connection.disconnect();
};

<iq xmlns="jabber:client"
type="result" id="pingPong"
from="demo" to="demo1@demo/eeffca60"/>

Example: support chat (1)
this.bindSendMessage = function ()
{
var me = this;
var chatMsg = $('#message');

$('#sendMessage').bind('click', function() {
me.sendChatMessage(chatMsg.val());
me.resetTextarea(chatMsg);
});

chatMsg.keyup(function(event) {
if (event.keyCode == 13 && event.shiftKey) {
me.sendChatMessage(chatMsg.val());
me.resetTextarea(chatMsg);
}
});
};

this.statusHandler = function (status)
{
var me = this;
me.logStatus(status);
me.connection.addHandler(
function(msg) { //(Function) handler.
return me.handleChatMessage(msg);
},
null, //(String) ns
'message', //(String) name
'chat'); //(String) type
}
};


this.handleChatMessage = function (msg)
{
var me = this;

var from = objMsg.attr('from');
var nick = Strophe.getNodeFromJid(from);
var body = objMsg.children('body').text();

me.addMessageToChat(nick, body);

return true;
};

this.addMessageToChat = function (nick, body)
{
var me = this;
var container = $('#chat');
var atBottom =
container.scrollTop() >=
container[0].scrollHeight - container.height();

container.append('<dt>'+ nick +'</dt><dd>'+
me.nl2br(body, true) +'</dd>');

if (atBottom) {
container.scrollTop(container[0].scrollHeight);
}
};

Example: statistics

this.handleHighChartData = function (msg)
{
var me = this;

var body = objMsg.children('body').text();

me.chart.series[0].setData(jQuery.parseJSON(body));
return true;
};

Example: prebind BOSH (1)

• SID - RID

• Security

• User friendly

• Performance

• Persisting

Example: prebind BOSH(2)
this.initConnection = function ()
{
var me = this;

me.connection = new Strophe.Connection(me.httpBindUrl);

me.connection.attach(
me.options.service.jid,
me.options.service.sid,
me.options.service.rid,
function (status) {
me.statusHandler(status);
});
};

Thank you

• bert@becoded.be

• Code: https://github.com/becoded/talk-xmpp-demo

• Slides: Slideshare

• Rate / comments: http://joind.in/3778

Powering your website with realtime data

Recommended

Recommended

More Related Content

What's hot

What's hot (20)

Viewers also liked

Viewers also liked (6)

Similar to Powering your website with realtime data

Similar to Powering your website with realtime data (20)

Recently uploaded

Recently uploaded (20)

Powering your website with realtime data