Powering your website with realtime data

October 2011Powering your website with realtime data Bert Van Hauwaertbert@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 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: 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

Install server: Openfire (2)• http://[server-ip]:9090/

Install server: Openfire (3)• Plugins • User Service • Monitoring Service

Configure apache: why (1)Client - polling ta ta ta data no da no da no daServer d ata w ne dataClient - 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 ruleProxyRequests OffProxyPass /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.jsvar 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: setup

Examples: messages• Browser • Log• Adium

Example: IQ ping pong (1)this.statusHandler = function (status) { var me = this; if (status == Strophe.Status.CONNECTED) { 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)); } };

Example: IQ ping pong (2)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);};

Example: IQ ping pong (3)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); } });};

Example: support chat (2)this.statusHandler = function (status){ var me = this; me.logStatus(status); if (status == Strophe.Status.CONNECTED) { me.connection.addHandler( function(msg) { //(Function) handler. return me.handleChatMessage(msg); }, null, //(String) ns message, //(String) name chat); //(String) type }};

Example: support chat (3)this.handleChatMessage = function (msg){ var me = this; var objMsg = $(msg); var from = objMsg.attr(from); var nick = Strophe.getNodeFromJid(from); var body = objMsg.children(body).text(); me.addMessageToChat(nick, body); return true;};

Example: support chat (4)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: statisticsthis.handleHighChartData = function (msg){ var me = this; var objMsg = $(msg); 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

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