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Node.js (Advanced)

Suresh Reddy
Senior Software Engineer
Echidna, Inc.

Agenda

What is Node.JS

Using Node.JS

Common Modules

Streams

Express

Load balancing

Competitors

References

What is Node.JS


JavaScript programming environment for creating highly
scalable network programs

Provides evented, Non-blocking I/O

Built on top of V8

Node.JS is bare bone and the community are making stuff
like Express, connect etc.

What is Node.JS
Event driven programming
$.ajax(
url:'http://example.com/getProducts?cid=132867',
type:'GET',
contentType:'application/json',
success:function(response){// doWithResponse
},
error:function(xhr){// Error :(
}
);

Using Node.JS

Install Node.JS

wget http://nodejs.org/dist/node-v0.1.96.tar.gz

gunzip node-v0.1.96.tar.gz

cd node

./configure

make

make install

NPM

Install/Publish other modules you want by doing

npm install <module_name>

npm publish <module_name>

Node.JS – as an interactive shell
Similar to Python’s shell

$> node
>3+1
4
> true != false
true
>.help
>.exit

Node.JS – As a server
var http = require('http');
http.createServer(function (req, res) {
res.writeHead(200, {
'Content-Type': 'text/plain'
});
res.end('Hello Worldn');
}).listen(1337, "127.0.0.1");

console.log('Server running at
127.0.0.1:1337');

Core Modules


Processes

Filesystem

Networking

Utilities

The entire list can be found at http://nodejs.org/api/

Core Modules - Processes
Node allows you to analyze your process and manage external
process

Available Modules


process

child_process

Core Modules - Filesystem
Low level API to manipulate files

Available Modules


fs

path

Core Modules - Networking
Available Modules


net

dgram

http

tls

https

dns

Express

Basic web framework

Runs on top of Node.js

Provides routing and redirection helpers

Dynamic view helpers

Has support for session

Focus on high performance

Streams

Stream instances are Unix pipes

Readable

must emit ”data” events whenever they have data to be
read and ”end” when the data stream is finished.

Writable

must implement the write() method to accept new data
chunks into the stream and the end() method to instruct
the stream that the data is finished.

Node.JS is useful for..

Writing highly concurrent server applications

Sharing application logic between server and client

Peer-to-peer web applications using websockets

Real-time applications

Load Balancing
The ability to distribute work load across multiple servers


HAProxy

Nginix

Apache Http server

Other Asynchronous JavaScript
platforms


Tornado and Twisted for Python

Perl Object Environment for Perl

libevent for C

Vert.x for Java

EventMachine for Ruby

vibe.d for D

Links


http://nodejs.org

http://npmjs.org

http://expressjs.com

http://socket.io

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