Building real-time apps with node.js, socket.io

and knockout.js

Iván Loire

twitter: @ivanloire

email: ivan@iloire.com

Betabeers Zaragoza, 09/03/2012

Monday, March 12, 2012

you want real-time apps?

get the fastest tools!

Monday, March 12, 2012

node.js

high performance javascript library for intensive I/O operations. (like HTTP)

single threaded, event oriented.

built on Chrome’s Javascript runtime (V8)

lightweight, efficient, really fast.

.. insanely fast.

Monday, March 12, 2012

websockets

bi-directional, full duplex over a single tcp socket.

connection remains open = no tcp handshake

lightweight protocol = no http headers, 2 byte overhead

supported chrome 16, FF 11, IE 10, Opera 10

reducing latency from 150 (http) to 50 ms (sockets)

Monday, March 12, 2012

socket.iowebsockets for the rest of us.

fallback transports (yes, it also works in IE!!)

websockets

flash sockets

ajax long polling

ajax streaming

iframe

json polling..

Monday, March 12, 2012

knockout.js

rich, responsive display with a clean underlying data model.

declarative bindinds

automatic UI refresh

dependency tracking

templating

Monday, March 12, 2012

... and a fast database!

open source, high performance, in-memory, key-value data store

support master-slave replication

really fast!

if durability is not needed... insanely fast!

Monday, March 12, 2012

real-time web apps

node.js + redis + socket.io + knockout.js

real-time... or close enough?

Monday, March 12, 2012

let’s build a really simple real-time game...

thanks to @gimenete for getting me into node.js!... and thanks to @jmendiara for the node.js sticker!

Thanks!

Iván Loire (twitter: @ivanloire)

code: https://github.com/iloire/math-race

demo: http://letsnode.com:8090/

Monday, March 12, 2012