This document discusses Node.js, an event-driven JavaScript runtime environment. It provides examples of using Node.js to create HTTP servers and manage packages with npm. Key topics covered include Node.js' evented I/O model, using HTTP as a first-class protocol, installing Node.js via various tools, defining dependencies in a package.json file, testing with frameworks like Mocha and Chai, and deploying to platforms like Heroku or Nodejitsu. The document also mentions related projects like Express and Cluster for building web servers and managing multi-core processes.

1. Ferrara Linux Day 2011
The tools of NodeJs

2. Evented I/O for V8 JavaScript.
Node's goal is to provide an easy way to build scalable
network programs.
Node is similar in design to and influenced by systems like
Ruby's Event Machine or Python's Twisted.
HTTP is a first class protocol in Node. Node's HTTP library has
grown out of the author's experiences developing and working
with web servers.

3. Event what???
Example:
var http = require('http');
setInterval(function(){
console.log("Hello world");
}, 2000);
var host = '127.0.0.1';
var port = 12345;
http.createServer(function (req, res) {
res.writeHead(200, {'Content-Type': 'text/plain'});
res.end('Hello Worldn');
}).listen(port, host);
console.log('Server running at http://' + host + ':' + port + '/');

4. The first commit was:
"Autore: Ryan <ry@tinyclouds.org> 2009-02-16 01:02:00
Revisione creata da: Ryan <ry@tinyclouds.org> 2009-02-16 01:02:00
Figlio: 61890720c8a22a7f1577327b32a180a2d267d765 (add readme and initial code)
Ramo: master, remotes/origin/autoconf, remotes/origin/back_to_waf, remotes/origin/debugger,
remotes/origin/eventsource, remotes/origin/http_agent, remotes/origin/http_parser_refactor, remotes/origin/
many_listener_warning, remotes/origin/master, remotes/origin/pointer_bindings, remotes/origin/reload,
remotes/origin/v0.2, remotes/origin/v0.4, remotes/origin/writev, remotes/origin/writev2
Segue:
Precede: v0.0.1
add dependencies"
the project is young!

5. Very influenced from Ruby :-)

6. How to install Node?
You can build https://github.com/joyent/node
Or use something like this:
- Nave https://github.com/isaacs/nave
- Nvm https://github.com/creationix/nvm
- N https://github.com/visionmedia/n
All three are bash script that manage different versions on
node in different dirs.

7. In node there is only one way to manage packages: npm.
There was a big change in the first version, and now npm
manages easily same packages with different versions in
different projects.
The main actor is package.json defined in the CommonJs
specifications.

8. {
"author": "gpad",
"name": "nodelinuxday2011",
"description": "app example fo LinuxDay 2001",
"version": "0.0.1",
"homepage": "https://github.com/gpad/nodelinuxday2011",
"repository": {
"type": "git",
"url": "git://github.com/gpad/nodelinuxday2011.git"
},
[...]
}

9. {
[...]
"main": "./server.js",
"engines": {
"node": "*"
},
"dependencies": {
"formidable": "~1.0.6"
},
"devDependencies": {
"nodeunit": "~0.5.5",
"far": "~0.0.7"
}
}

10. package.json How it works?
see example ... Cloud9Ide
• Create a file with info e dependencies
• Execute npm install
Install all the dependencies locally so don't conflicts with
others in other projects.
What about devDependencies?

11. package.json devDependencies How it works?
see example ... Cloud9Ide
npm install --production
install locally only the package necessary to deploy. The
packages listed in devDependencies are not installed ...
Cloud9Ide on version 1.8.7 works in different way, if you execute npm
install install only "dependencies" if you execute npm install --dev
also install the devDependencies

12. What about testing? If you look this you will find a long list of
modules for Testing / Spec Frameworks, some examples:
Cucumber — The official JavaScript implementation of the well-
known BDD tool. Runs both on Node.js and browsers.
expresso — TDD framework by the author of JSpec
maryjane — Mock object library inspired by Mockito
node-qunit — QUnit port for nodejs. Very simple API, async testing,
good tested testing framework.
nodeunit — Simple syntax, powerful tools. Based on the assert
module. Available for node.js and the browser!

13. So we are at the end, how to deploy?
If you use Cloud9ide is very simple (is in beta now I can't :-)) ...,
you can deploy manually with Heroku tools in a very simple
way.
There is a new platform called Nodejitsu with all the tools
available on github.
Others use capistrano with this recipes

14. Other funny things??
• Jake - Similar to Rake
• Cluster - Node.JS multi-core server manager with plugins support
• Express - High performance, high class web development for
Node.js
• Node-DbDeploy - A data migration tool inspired by dbdeploy

15. Thank YOU !!!
Q&A