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A practical introduction Øredev 09.11.2011 (v1) Felix Geisendörfer

Transcript of Audience?felixge.s3.amazonaws.com/11/nodejs-a-practical...http_server.js node http_server.js$ curl...

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A practical introduction

Øredev 09.11.2011 (v1)Felix Geisendörfer

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@felixge

Twitter / GitHub / IRC

Felix Geisendörfer (Berlin, Germany)

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Audience?

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JavaScript?

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Node.js?

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History

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Ryan Dahl starts the node project (first commit)

Feb 16, 2009

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Discovered node.js (v0.0.6)

~June, 2009

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transloadit.com

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Core Contributor

&

Module Author

node-mysql node-formidable

+ 30 other modules

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Isaac Schlueter starts the npm package manager (first commit)

Sep 29, 2009

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Ryan’s talk at JSConf.EU gets people excited about node

Nov 7, 2009

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Today

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2nd most watched repository on GitHub

#2

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230 Contributors

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0.6.0 was released 4 days ago (Nov 5)

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Companies using node

• GitHub (for Downloads)

• Palm/HP (in WebOS)

• Yahoo! Mail

• Dow Jones & Company (for WJS social site)

• LinkedIn (Mobile Web App)

• Rackspace (Cloudkick monitoring)

• Voxxer (Push to Talk mobile app)

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Installing

$ git clone \git://github.com/joyent/node.git$ cd node$ git checkout v0.6.0$ ./configure$ sudo make install

(windows users: download node.exe)

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console.log('Hello World');hello.js

Hello World

nodeHello World$ hello.js

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Hello World (REPL)

node

Hello Worldconsole.log('Hello World')>

$

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Http Server

var http = require('http');var server = http.createServer(function(req, res) { res.end('Hi, how are you?');});

server.listen(8080);

http_server.js

node http_server.js$ curl localhost:8080$

Hi, how are you?

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“Come on, server side JS has been around since

1996”

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What is so special about node?

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Speed

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Speed

• Node can do ~6000 http requests / sec per CPU core (hello world, 1kb response,)

• It is no problem to handle thousands of concurrent connections which are moderately active

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V8 JavaScript Engine

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V8 JavaScript Engine

• Developed by Google in Aarhus, Denmark for Google Chrome

• Translates JavaScript in Assembly Code

• Crankshaft JIT (enabled in 0.6.0 by default)

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V8 JavaScript Engine

• You can expect to be within ~10x of C performance usually

• Certain code can run within 2-3x of C

• Getting faster all the time

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Non-Blocking I/O

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Blocking I/O

var fs = require('fs');var one = fs.readFileSync('one.txt', 'utf-8');console.log('Read file one');var two = fs.readFileSync('two.txt', 'utf-8');console.log('Read file two');

read_file_sync.js

Read file one node read_file_sync.js$

Read file two

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Non-Blocking I/O

var fs = require('fs');fs.readFile('one.txt', 'utf-8', function(err, data) { console.log('Read file one');});fs.readFile('two.txt', 'utf-8', function(err, data) { console.log('Read file two');});

read_file_async.js

Read file one

node read_file_async.js$Read file two

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Blocking I/O

Read one.txt (20ms)

Read two.txt (10ms)

Total duration (30ms)

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Non-Blocking I/O

Read one.txt (20ms)

Read two.txt (10ms)

Total duration (20ms)

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Non-Blocking I/O

• Close to ideal for high concurrency / high throughput, single execution stack

• Forces you to write more efficient code by parallelizing your I/O

• Feels pretty much like AJAX in the browser

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WebSockets(Push)

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WebSockets

• Persistent connection between browser/server

• Very hard / awkward to do on traditional stacks

• Hard to scale on traditional stacks

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Socket.IO (community module)

• WebSocket

• Adobe® Flash® Socket

• AJAX long polling

• AJAX multipart streaming

• Forever Iframe

• JSONP Polling

Chooses most capable transport at runtime!

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Streams

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“Streams are to time as arrays are to space.”-- Jed Schmidt @ JSConf.eu 2010

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Streams in node.js

• Readable

• Writable

• Both

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Streamsvar http = require('http');var server = http.createServer(function(req, res) { req.on('data', console.log);});server.listen(8080);

$ node stream.js &$ curl -F [email protected] localhost:8080------------------------------41e92562223eContent-Disposition: form-data; name="file"; filename="stream.js"Content-Type: application/octet-stream

var http = require('http');var server = http.createServer(function(req, res) { req.setEncoding('utf8'); req.on('data', console.log);});server.listen(8080);

------------------------------41e92562223e--

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Streams

var http = require('http');var spawn = require('child_process').spawn;

http.createServer(function(req, res) { var params = req.url.split('/'); var args = [params[1], '-resize', params[2], '-']; var convert = spawn('convert', args);

convert.stdout.pipe(res);}).listen(8080);

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On Github

felixge/node-convert-example

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NPM package manager

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NPM

• Puts dependencies in the right place, then gets out of your way

• No modification of a global load path (require.paths is gone in 0.6.0)

• 4700+ Modules in npm, > 10 new modules / day

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So what is node good for?

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Use cases

• WebSockets/Push applications

• Proxying data streams

• Backend for single page apps

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Use cases

• Spawning other programs (processes) to do work / IPC

• Parallelizing I/O

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So what is node not good for?

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Anti-Use cases

• Actual Realtime Systems

• Number crunching / huge in-memory datasets

• (CRUD apps)

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Join the Community

• Mailing list (nodejs, nodejs-dev)

• IRC (#node.js) - 700+ User online

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Thank you!

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Questions?

☝@felixge

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Thank you!

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Bonus Slide

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What’s next?

• Domains

• Improved Stream API


NodeJS for Beginner

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Busy Developer's Guide to NodeJS · Objectives See how to get started with NodeJS See some NodeJS example code Explore some NodeJS modules Discuss its pros/cons over other tools

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