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PocketIO is perl's implementation for socket.io, a realtime web library originally written in JS. In this keynote I present the concepts of real-time web, and how to use it in perl
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Tel Aviv Perl Mongers
Realtime Web with PocketIOYnon Perek
Wednesday, November 28, 12
Whoami
✤ Ynon Perek
✤ ynonperek.com
✤ ynon@ynonperek.com
Wednesday, November 28, 12
Agenda
✤ What’s wrong with HTTP
✤ Real Time Web - Concepts
✤ PocketIO Coding Demos
Wednesday, November 28, 12
What is wrong with HTTP ?
Here It Is
GET page
Wednesday, November 28, 12
Let’s try a Live Chat
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HTTP Live Chat
✤ All communication is mediated by server using HTTP
Tell Laura I Love Her
Wednesday, November 28, 12
HTTP Live Chat
✤ But the server can only reply ...
Ok, got it
Wednesday, November 28, 12
HTTP Live Chat
✤ Waiting...
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HTTP Live Chat
✤ Meantime, on Laura’s side
Do I have any messages ?
Tommy said he loves you
Wednesday, November 28, 12
A second later
Wednesday, November 28, 12
HTTP Live Chat
Do I have any new messages ?
No, sorry
Wednesday, November 28, 12
A second later
Wednesday, November 28, 12
HTTP Live Chat
Do I have any new messages ?
No, sorry
Wednesday, November 28, 12
A second later
Wednesday, November 28, 12
HTTP Live Chat
Do I have any new messages ?
No, sorry
Wednesday, November 28, 12
HTTP Live Chat Dark Side
✤ Server is busy picking up requests
✤ Clients are busy polling
✤ Everyone loses
Wednesday, November 28, 12
Real Time Web
✤ Improved UX by allowing the server to notify a client
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What’s Available
✤ Plugins (usually flash) to open client/server sockets
Wednesday, November 28, 12
What’s Available
✤ Comet
Wednesday, November 28, 12
What’s Available
✤ Web Sockets (modern browsers)
Wednesday, November 28, 12
Meet PocketIOPerl implementation of Socket.IO written by vti
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The Good
✤ Chooses the best available transport layer
✤ Manages active connections and reconnections
✤ Awesome
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PocketIO Components
Server Side Backend(perl)
Client Side Library(JavaScript)
Wednesday, November 28, 12
Coding Time
Wednesday, November 28, 12
PocketIO Architecture
Twiggy Web Server
PocketIO Service
“Normal” Web Service
Wednesday, November 28, 12
What You Need
✤ cpanm PocketIO
✤ Use Twiggy (or fliggy)
✤ Use Plack::Builder
Wednesday, November 28, 12
What You Need
✤ /socket.io/socket.io.js should point to the client-side library
mount '/socket.io/socket.io.js' => Plack::App::File->new( file => "$root/public/javascripts/socket.io.js");
Wednesday, November 28, 12
What You Need
✤ /socket.io should return a new PocketIO object
mount '/socket.io' => PocketIO->new( class => 'PocketHandler', method => 'run', );
Method that returns a subroutine reference to bind socket actions
Wednesday, November 28, 12
PocketIO::Run
✤ Demo 1: Echo Server
Wednesday, November 28, 12
PocketIO Broadcasts
✤ notify all except sender:$sender->broadcast->emit(‘message’, ‘text’);
✤ notify all (including sender)$sender->sockets->emit(‘message’, ‘text’);
✤ send an object$sender->sockets->emit(‘message’, { message => ‘text’});
Wednesday, November 28, 12
PocketIO Broadcasts
✤ Demo2: Shared Echo (wall)
✤ Let’s turn our wall to multi-user wall
Wednesday, November 28, 12
PocketIO Sharing Data
✤ Use an external data store (DB, Redis)
✤ Use Plack
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External Data Store
Shared Data Store
PocketIO Dancer
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Plack
✤ Create a shared variable in Plack::Builder (or a middleware)
✤ Pass it to all apps
✤ Demo
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PocketIO Takeaways
✤ Bring users closer together by allowing smooth collaboration
✤ Improve UX
✤ Multiplayer Zombie Slaying games FTW
Wednesday, November 28, 12
Thank You
✤ Slides are available at:http://www.slideshare.net/YnonPerek
✤ Code is available at:https://github.com/ynonp/pm-nov-12
✤ I’m available at:http://mobileweb.ynonperek.com
Wednesday, November 28, 12
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