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node.js
 A quick tour



 Felix Geisendörfer




                      20.04.2011 (v6)
@felixge

Twitter / GitHub / IRC
About

 • Felix Geisendörfer

 • Berlin, Germany

 • Debuggable Ltd
Core Contributor

                    &

              Module Author



node-mysql                      node-formidable
File uploading & processing as an infrastructure
     service for web & mobile applications.
Audience?
Server-side JavaScript
Server-side JavaScript

• Netscape LiveWire (1996)

• Rhino (1997)

• 50+ plattforms since then
What was the problem?

• Slow engines

• Lack of interest in JS until ~2005

• Better competing plattforms
Why JavaScript?
     3 Reasons
#1 - The good parts
V8 (Chrome)


SpiderMonkey (Firefox)           JavaScriptCore (Safari)



      #2 - JS Engine Wars
       Chakra (IE9)               Carakan (Opera)

                         check out:
                      arewefastyet.com
#3 - No I/O in the core
Node's goal is to provide an easy way to build
        scalable network programs.
Node.js

• Created by Ryan Dahl

• Google’s V8 JavaScript engine (no DOM)

• Module system, I/O bindings, Common Protocols
Installing

$ git clone 
git://github.com/ry/node.git
$ cd node
$ ./configure
$ make install
Hello World

$ cat test.js
console.log('Hello World');

$ node test.js
Hello World
Ingredients
         libeio            libev




c-ares                      V8


             http_parser
Philosophy

• Just enough core-library to do I/O

• Non-blocking

• Close to the underlaying system calls
Non-blocking I/O
Blocking I/O

var a = db.query('SELECT A');
console.log('result a:', a);

var b = db.query('SELECT B');
console.log('result b:', b);


         Time = SUM(A, B)
Non-Blocking I/O
db.query('SELECT A', function(result) {
  console.log('result a:', result);
});

db.query('SELECT B', function(result) {
  console.log('result b:', result);
});

             Time = MAX(A, B)
Non-Blocking I/O

• Offload most things to the kernel and poll
  for changes (select, epoll, kqueue, etc.)


• Thread pool for anything else
Single Threaded
var a = [];
function first() {
  a.push(1);
  a.push(2);
}

function second() {
  a.push(3);
  a.push(4);
}

setTimeout(first, 10);
setTimeout(second, 10);
Single Threaded
var a = [];
function first() {
  a.push(1);              • [1, 2, 3, 4] ?
  a.push(2);
}
                          • [3, 4, 1, 2] ?
function second() {
  a.push(3);
  a.push(4);              • [1, 3, 2, 4] ?
}

setTimeout(first, 10);
                          • BAD_ACCESS ?
setTimeout(second, 10);
Single Threaded
var a = [];
function first() {
  a.push(1);              • [1, 2, 3, 4]
  a.push(2);
}
                          • [3, 4, 1, 2]
function second() {
  a.push(3);
  a.push(4);              • [1, 3, 2, 4]
}

setTimeout(first, 10);
                          • BAD_ACCESS
setTimeout(second, 10);
API Overview
CommonJS Modules
$ cat hello.js
exports.world = function() {
   return 'Hello World';
};

$ cat main.js
var hello = require('./hello');
console.log(hello.world());

$ node main.js
Hello World
Child processes
$ cat child.js
var spawn = require('child_process').spawn;
var cmd = 'echo hello; sleep 1; echo world;';

var child = spawn('sh', ['-c', cmd]);
child.stdout.on('data', function(chunk) {
  console.log(chunk.toString());
});

$ node child.js
"hellon"
# 1 sec delay
"worldnn"
Http Server
$ cat http.js
var http = require('http');
http.createServer(function(req, res) {
  setTimeout(function() {
    res.writeHead(200);
    res.end('Thanks for waiting!');
  }, 1000);
}).listen(4000);

$ curl localhost:4000
# 1 sec delay
Thanks for waiting!
Tcp Server
$ cat tcp.js
var tcp = require('tcp');
tcp.createServer(function(socket) {
  socket
    .on('connect', function() {
       socket.write("Hi, How Are You?n> ");
    })
    .on('data', function(data) {
       socket.write(data);
    });
}).listen(4000);

$ nc localhost 4000
Hi, How Are You?
> Great!
Great!
DNS

$ cat dns.js
var dns = require('dns');
dns.resolve('nodejs.org', function(err, addresses) {
 console.log(addresses);
});

$ node dns.js
[ '8.12.44.238' ]
Watch File
$ cat watch.js
var fs = require('fs');
fs.watchFile(__filename, function() {
  console.log('You changed me!');
  process.exit(0);
});

$ node watch.js
# edit watch.js
You changed me!
And much more

• UDP            • Buffer

• Crypto         • VM

• Assert         • EcmaScript5
           ...
Suitable Applications
Suitable Applications

• Singe-page apps

• Real time

• Crawlers
More Applications

• Async chaining of unix tools

• Streaming

• File uploading
Interesting projects
Package management
Web Frameworks

• Express.js (Sinatra clone)

• Fab.js (Mind-bending & awesome)
Socket.IO
var http = require('http');
var io = require('socket.io');

var server = http.createServer();
server.listen(80);

var socket = io.listen(server);
socket.on('connection', function(client){
  client.send('hi');

  client.on('message', function(){ … })
  client.on('disconnect', function(){ … })
});


                 Server
Socket.IO

<script src="http://{node_server_url}/socket.io/socket.io.js" />
<script>
  var socket = new io.Socket({node_server_url});
  socket.connect();
  socket.on('connect', function(){ … })
  socket.on('message', function(){ … })
  socket.on('disconnect', function(){ … })
</script>




                             Client
Socket.IO
       •   WebSocket

       •   Adobe® Flash® Socket

       •   AJAX long polling

       •   AJAX multipart streaming

       •   Forever Iframe

       •   JSONP Polling

Chooses most capable transport at runtime!
1600+ modules in npm
Ready for production?
Ready for production?
• Handled over 100.000 file uploads

• Several TB of data

• No bugs, Memory usage betwen 30 - 80 MB
         Our experience at Transloadit.com
Ready for production?

• 0.4.6 was released on April 13th

• 0.4.x API is stable

• Very few bugs, but YMMV
Things that suck
Things that suck
• Stack traces are lost at the event loop
  boundary


• Utilizing multiple cores requires multiple
  processes


• V8: 1.9 GB heap limit / GC can be
  problematic
Community
Benevolent Dictator For Life




          Ryan Dahl
Community

• Mailing list (nodejs, nodejs-dev)

• IRC (#node.js)
Hosting
More information


  nodeguide.com
Meet the community
        nodecamp.de

         June 11 - 12

     Cologne, Germany
Tickets available 12pm CET tomorrow
Questions?




✎   @felixge / felix@debuggable.com
Bonus Slides
Speed
Speed
var http = require(’http’)
var b = new Buffer(1024*1024);

http.createServer(function (req, res) {
  res.writeHead(200);
  res.end(b);
}).listen(8000);


                                   by Ryan Dahl
Speed
100 concurrent clients
1 megabyte response

node 822 req/sec
nginx 708
thin 85
mongrel 4

(bigger is better)
                         by Ryan Dahl
Speed

• NGINX peaked at 4mb of memory

• Node peaked at 60mb

• Very special circumstances
                                  by Ryan Dahl
What about all those
    callbacks?
db.query('SELECT A', function() {
  db.query('SELECT B', function() {
    db.query('SELECT C', function() {
      db.query('SELECT D', function() {
        // ouch
      });
    });
  });
});
You are holding it wrong!
Nested Callbacks

• Function does too many things, break it up

• Use an sequential abstraction library

• Consider using a JS language extension
Nested Callbacks

err1,   result1   =   db.query!   'SELECT   A'
err2,   result2   =   db.query!   'SELECT   B'
err3,   result3   =   db.query!   'SELECT   C'
err4,   result4   =   db.query!   'SELECT   D'


                  Kaffeeine
Questions?




✎   @felixge / felix@debuggable.com

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