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Node.js Workshop
Tom Hughes-Croucher Chief Evangelist / Node Tech Lead @sh1mmer [email protected]
Overview • • • • • • • • •
Running order
Introduction Why Server-Side JavaScript? What is Node? Using Node Understanding Node Node Ecosystem Programming Style More Complex applications Deploying Node apps to the cloud
Introduction • Tom Hughes-Croucher • Chief Evangelist at Joyent • Node.js core contributor • Author of "Up and Running with Node.js"
Scalable Server-Side Code with JavaScript
Node
Up and Running
Tom Hughes-Croucher
Major update this week
Why Server-Side JavaScript?
JavaScript programmers 3>2>1
Massive Code base of jQuery and other JS libraries
Laziness or “I’m sick of writing stuff twice” I could have said efficiency, but I think we all secretly long to sit around in our underwear.
Progressive Enhancement is free* Remember WWCD (What Would Crockford Do)
*close enough
TL;DR: SSJS is Awesome Like a Unicorn riding a Narwhal
If SSJS is so awesome why is it "new"?
1. Professionalism
“Yahoo!'s corporate motto is: Don't be eval().“
2. JavaScript Runtimes
Runtimes • V8 (Google), C++ • Spider Monkey (Mozilla), C++ • Rhino (Mozilla), Java
V8
Spider Monkey
JavaScript Performance
8x
Sep 08!
Mar 11!
Anatomy of SSJS
Node
{ !
Runtime != Browser
No DOM (By default, anyway)
Summary • Benefits of SSJS • Lots of JavaScript expertise • Lots of web code in JS libraries • Write once, run anywhere • Progressive Enhancement • Why SSJS happened now • Professionalism in JavaScript • New generation of JavaScript runtimes
Nave • Installs and versions Node • Allows Node shells with specific versions • Allows you to get 'latest' <-- Stable • May add 'unstable' option in future
Manual Installation
Go to http://nodejs.org/#download and get the URL of the current stable release
Enki:~ $ wget -q http://nodejs.org/dist/nodev0.4.10.tar.gz Enki:~ $ tar xzf node-v0.4.10.tar.gz Enki:~ $ cd node-v0.4.10 Enki:~/node-v0.4.10 $
Local or system?
Local
Enki:~/node-v0.4.10 $ mkdir ~/local Enki:~/node-v0.4.10 $ ./configure --prefix=~/local Checking for program g++ or c++ : /usr/bin/g++ Checking for program cpp : /usr/bin/cpp ... Checking for fdatasync(2) with c++ : no 'configure' finished successfully (3.466s)
> console.log('Hello World'); Hello World > .help .clear Break, and also clear the local context. .exit Exit the prompt .help Show repl options > .clear Clearing context... > .exit Enki:~ $
Enki:~ $ node > var foo = "bar"; > foo; 'bar' > .clear Clearing context... > foo ReferenceError: foo is not defined at [object Context]:1:1 at Interface. (repl:98:19) at Interface.emit (events:27:15) at Interface._ttyWrite (readline:295:12) at Interface.write (readline:132:30) at Stream. (repl:79:9) at Stream.emit (events:27:15) at IOWatcher.callback (net:489:16)
var http = require('http'); http.createServer(function (req, res) { res.writeHead(200, {'Content-Type': 'text/plain'}); res.end('Hello World\n'); }).listen(8124, "127.0.0.1"); console.log('Server running at http://127.0.0.1:8124/');
var http = require('http'); //include the http library
http.createServer(function (req, res) { }).listen(8124, "127.0.0.1"); //create an http server //when ‘stuff’ happens call this anonymous function //listen on port 8124 of the IP 127.0.0.1
http.createServer(function (req, res) { res.writeHead(200, {'Content-Type': 'text/plain'}); res.end('Hello World\n'); }) //when ‘stuff’ happens my function fires //I get a request object and a response object //I write to the response object header //HTTP status 200 and content-type ‘text/plain’ //close the response with the body: //Hello World
console.log('Server running at http://127.0.0.1:8124/'); //write Server is running at http://127.0.0.1:8124/ //to the console
Interactive Debugging
Enki:~/Code/node-examples $ node --debug helloworld.js debugger listening on port 5858 Server running at http://127.0.0.1:8124/
Exercise • Fetch the NYTimes.com and output the contents to the console
• Create a web server • Create an HTTP client • POST data to your web server • Output the POST data to console
Events
object.on('event', function() { //stuff } );
EventEmitter
EventEmitter • manage "event handlers" • list of functions to be called per event
• provide mechanism to trigger events
var util = require('util'), EE = require('events').EventEmitter; util.inherits(MyClass, EE); var myObj = new MyClass(); //nb using first class functions myObj.on('something', function);
math.js exports.add = function() { var sum = 0, i = 0, args = arguments, l = args.length; while (i < l) { sum += args[i++]; } return sum; };
increment.js var add = require('math').add; exports.increment = function(val) { return add(val, 1); }; var inc = require('increment').increment; var a = 1; inc(a); // 2
Protip exports.awesome = function() { //yay my code is awesomesauce }; var exports.fail = function() { //exports is a global //by redeclaring it as //a local variable //your code _will_ fail };
Exercise • Create a CommonJS module called "fish" • Provide functions to: • swim • mouth breath • flop around • Import your module into a node project • Call the various functions
Node Package Manager (NPM)
NPM is written in JavaScript for Node
Enki:~ $ cat `which npm` #!/usr/bin/env node ;(function () { // wrapper in case we're in module_context mode var log = require("../lib/utils/log") log.waitForConfig() log.info("ok", "it worked if it ends with") var fs = require("../lib/utils/graceful-fs") , path = require("path") , sys = require("../lib/utils/sys") , npm = require("../npm") , ini = require("../lib/utils/ini") , rm = require("../lib/utils/rm-rf")
app.use(express.bodyParser()); app.use(express.cookieParser()); app.post('/', function(req, res){ // Perhaps we posted several items with a form // (use the bodyParser() middleware for this) var items = req.body.items; console.log(items); res.send('logging'); });
Templating
var express = require("express"); app.configure(function () { var public = __dirname + "/../public/"; public = require("path").normalize(public);
If ? is not after a variable then only the previous character is affected * Can be used as a wildcard in routes Includes when end of URL is optional e.g. '/app/e?'
•
Regex can be used any place in a route string e.g. '/app/(\\d)r?'
Exercises •
Create an express app with routes that capture '/' '/products' and '/services'
•
Create a route that captures the product ID after '/product/' e.g. '/product/abc12' and returns it in the response
•
Use a regular expression to restrict the ID parameter to 3 letter followed by 3-5 numbers
•
Create a route using a regex that matches the entire route
Passing Control • Routes are actually 'stacked middleware' • You can pass control between routes • The next() function calls the next matching route
app.get('/users/:id', function(req, res, next){ var id = req.params.id; if (checkPermission(id)) { // show private page } else { next(); } }); app.get('/users/:id', function(req, res){ // show public user page });
Passing Control •
next() is a function of router (and defined in the closure containing the route)
•
router will grab routes in the order they were declared
•
e.g. since'/*' will match everything so it should be the last route!
•
router doesn't care about verbs so you can use all () to operate on all verbs/routes and then use next () to pass to get(), put(), etc
Exercises • Create a simple check for correct product
IDs if not pass control to a route showing a custom error page
• Use app.all() to check user permission
before showing (mock-up) edit controls on a web site
Middleware
It's a pattern
req, res
next()
next()
next()
req, res
next()
next()
Dispatcher next()
req res
req, res, next
var express = require('express'), app = express.createServer(); var middleware = function (req, res, next) { req.foo = 'bar'; next(); }; app.use(middleware); app.get('/', function(req, res) { res.send(req.foo);
var express = require('express'), app = express.createServer(); var middleware = function (req, res, next) { var send = res.send; res.send = function(d) { res.send = send; res.send('hijacked! ' + d); } next(); }; app.use(middleware); app.get('/', function(req, res) { res.send('hi'); });
Connect middleware (Renamed express.* for convenience)
var express = require('express'), app = express.createServer(); var middleware = function (req, res, next) { req.foo = 'bar'; next(); }; app.get('/', middleware, function(req, res) { res.send(req.foo); });
var a, b, c, d; a = b = c = d = function(req,res,next) { next(); } var set1 = [a,b]; var set2 = [c,d]; var all = [set1, set2]; app.get('/set1', set1, function(req,res) { res.send('output'); }); app.get('/set2', [c,d], function(req,res) { res.send('output'); }); app.get('/all', all, function(req,res) { res.send('output'); });
Middleware factories
Middleware are just functions
var a, b, c, d; a = b = c = d = function(req,res,next) { next(); } var set1 = [a,b]; var set2 = [c,d]; var all = [set1, set2]; app.get('/set1', set1, function(req,res) { res.send('output'); }); app.get('/set2', [c,d], function(req,res) { res.send('output'); }); app.get('/all', all, function(req,res) { res.send('output'); });
var mFactory = function(letter) { return function(req,res,next) { var send = res.send; res.send = function(d) { res.send = send; res.send(letter + ' ' + d); } next(); } }; var set1 = [mFactory('a'),mFactory('b')]; var set2 = [mFactory('c'),mFactory('d')]; var all = [set1, set2]; app.get('/set1', set1, function(req,res) { res.send('output'); }); app.get('/set2', set2, function(req,res) { res.send('output'); }); app.get('/all', all, function(req,res) { res.send('output'); });
Exercise • Create a middleware to detect mobile
phone browsers and attach a boolean to req
• Create an express app that serves up links to an image using staticProvider
• Modify Profiler to profile your app and write each profile to a log file
• Create a middleware factory that sets the HTTP Expires header based on roles
Error handling
function NotFound(msg){ this.name = 'NotFound'; Error.call(this, msg); Error.captureStackTrace(this, arguments.callee); } NotFound.prototype.__proto__ = Error.prototype; app.get('/404', function(req, res){ throw new NotFound; }); app.get('/500', function(req, res){ throw new Error('keyboard cat!'); });
Create an express server that use jade, haml, ejs to render an index page
•
Create a public folder and include file from it (CSS, images, etc) in your layout
• •
Create a route for '/blog/id' to accept only digits
• •
Create a view for the '/blog/id' show the correct post
Make a 'fake database' (array) of blog posts and use a middleware to validate each id is valid Use a view partial to a preview of each blog post on the index page
