Node.js and websockets intro

Apr 26, 201016 likes5,333 views

A short intro about node.js and websockets. You can find the demostration at http://github.com/kompozer/tweamer

Node.js and
WebSockets
A (very) short introduction

Andreas Kompanez

Montag, 26. April 2010

Node.js
JavaScript Framework

Server-side

Uses V8

Evented and non-blocking

CommonJS

Uses ECMAScript 5

Montag, 26. April 2010

Node.js

Created by Ryan Dahl

~8000 lines of C/C++ and 2000 lines
JavaScript

http://nodejs.org/

Montag, 26. April 2010

Evented?

Old (blocking) school:
<?php
$content = file_get_contents("/some/huge/file");
doThings($content); // Waiting, synchron
otherThing();

Montag, 26. April 2010

Evented?

Evented I/O
file.read("/some/huge/file", function(data) {
// called after data is read
doThings(data);
});
otherThing(); // execute immediately;

Montag, 26. April 2010

Benefits

Asynchronous programming

Event-loops instead of threads

Non-blocking

1 Thread (No context switching etc.)

Montag, 26. April 2010

CommonJS

A collection/library of standards

Modules

Binary

File system

and many more!

Montag, 26. April 2010

CommonJS Modules

There should be a function require

There should be a var called exports

Montag, 26. April 2010

Module Example
// math.js module
exports.multiply = function(a, b) {
return a * b;
}

// Some other file, using math.js
//
var math = require('./math');
var sys = require('sys');

sys.puts(math.multiply(12, 12));

Montag, 26. April 2010

Google V8 JavaScript
Engine
It’s a VM!

Developed by Google

The team lead is Lars Bak (Sun’s Java
VM & Smalltalk VM)

No JIT, compiled to Assembler

Montag, 26. April 2010

The 6+ lines http
server
// httpserver.js
// Usage: node httpserver.js
var sys = require("sys"),
http = require("http");

http.createServer(function(request, response) {
var headers = { "Content-Type": "text/plain" };
response.sendHeader(200, headers);
response.write("Hello, World!n");
response.close();
}).listen(8000);

sys.puts("Running at http://127.0.0.1:8000/");

Montag, 26. April 2010

WebSockets

A HTML5 standard

Allows bidirectional communications

Less overhead than HTTP/AJAX (less
headers)

Cross domain

Montag, 26. April 2010

Polling
Client Mailman Server

Montag, 26. April 2010

Bidirectional
Client Telephone Server

Montag, 26. April 2010

WS Communication
details
Handshake
GET /test HTTP/1.1 HTTP/1.1 101 Web Socket Protocol Handshake
Upgrade: WebSocket Upgrade: WebSocket
Connection: Upgrade Connection: Upgrade
Origin: http://localhost/test Server: Resin/4.0.2
Host: localhost WebSocket-Location: ws://localhost/websocket
Content-Length: 0 WebSocket-Origin: http://localhost/test
Content-Length: 0
Date: Fri, 08 May 2009 09:51:31 GMT

Messages
x00hello, worldxff

Montag, 26. April 2010

WebSockets Client-
side
if (("WebSocket" in window)) {
var ws = new WebSocket("ws://localhost:8080/");

ws.onmessage = function(evt) {
// Receive
};
ws.onopen = function(evt) {
//
ws.send('Oh hai');
};
ws.onclose = function(evt) {
//
};
ws.onerror = function(evt) {
//
};
ws.close();
}

Montag, 26. April 2010

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Node.js and websockets intro

1. Node.js and WebSockets A (very) short introduction Andreas Kompanez Montag, 26. April 2010

2. Node.js JavaScript Framework Server-side Uses V8 Evented and non-blocking CommonJS Uses ECMAScript 5 Montag, 26. April 2010

3. Node.js Created by Ryan Dahl ~8000 lines of C/C++ and 2000 lines JavaScript http://nodejs.org/ Montag, 26. April 2010

4. Evented? Old (blocking) school: <?php $content = file_get_contents("/some/huge/file"); doThings($content); // Waiting, synchron otherThing(); Montag, 26. April 2010

5. Evented? Evented I/O file.read("/some/huge/file", function(data) { // called after data is read doThings(data); }); otherThing(); // execute immediately; Montag, 26. April 2010

6. Benefits Asynchronous programming Event-loops instead of threads Non-blocking 1 Thread (No context switching etc.) Montag, 26. April 2010

7. CommonJS Montag, 26. April 2010

8. CommonJS A collection/library of standards Modules Binary File system and many more! Montag, 26. April 2010

9. CommonJS Modules There should be a function require There should be a var called exports Montag, 26. April 2010

10. Module Example // math.js module exports.multiply = function(a, b) { return a * b; } // Some other file, using math.js // var math = require('./math'); var sys = require('sys'); sys.puts(math.multiply(12, 12)); Montag, 26. April 2010

11. Google V8 JavaScript Engine It’s a VM! Developed by Google The team lead is Lars Bak (Sun’s Java VM & Smalltalk VM) No JIT, compiled to Assembler Montag, 26. April 2010

12. The 6+ lines http server // httpserver.js // Usage: node httpserver.js var sys = require("sys"), http = require("http"); http.createServer(function(request, response) { var headers = { "Content-Type": "text/plain" }; response.sendHeader(200, headers); response.write("Hello, World!n"); response.close(); }).listen(8000); sys.puts("Running at http://127.0.0.1:8000/"); Montag, 26. April 2010

13. WebSockets Montag, 26. April 2010

14. WebSockets A HTML5 standard Allows bidirectional communications Less overhead than HTTP/AJAX (less headers) Cross domain Montag, 26. April 2010

15. Polling Client Mailman Server Montag, 26. April 2010

16. Bidirectional Client Telephone Server Montag, 26. April 2010

17. WS Communication details Handshake GET /test HTTP/1.1 HTTP/1.1 101 Web Socket Protocol Handshake Upgrade: WebSocket Upgrade: WebSocket Connection: Upgrade Connection: Upgrade Origin: http://localhost/test Server: Resin/4.0.2 Host: localhost WebSocket-Location: ws://localhost/websocket Content-Length: 0 WebSocket-Origin: http://localhost/test Content-Length: 0 Date: Fri, 08 May 2009 09:51:31 GMT Messages x00hello, worldxff Montag, 26. April 2010

18. WebSockets Client- side if (("WebSocket" in window)) { var ws = new WebSocket("ws://localhost:8080/"); ws.onmessage = function(evt) { // Receive }; ws.onopen = function(evt) { // ws.send('Oh hai'); }; ws.onclose = function(evt) { // }; ws.onerror = function(evt) { // }; ws.close(); } Montag, 26. April 2010

19. Demo! Montag, 26. April 2010

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