Presentation for the first Amsterdam node.js meetup.

1. Sunday, April 1, 12
020
node.js meetup

2. HOW WE’RE BUILDING WERCKER
node.js essential modules and tools
Micha Hernández van Leuffen Wouter Mooij
@mies @wwwouter
mies@wercker.com wouter@wercker.com
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3. Continuous Deployment
made easy
wercker
accelerator
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4. wercker
Wercker is a hosted continuous deployment platform,
helping developer-teams working on web-applications,
push smaller pieces of code, such that bugs are quickly
detected and resolved.
It is easy to use and with you from the start.
Sunday, April 1, 12

5. WHAT WE’RE USING
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6. TECHNOLOGY STACK
BACKBONE.JS
wercker WEBSOCKETS
.net
node.js
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7. EXPRESS
‣ Powers the Wercker API
‣ Similar to Sinatra in Ruby or Flask in
Python
‣ Just Use It
‣ expressjs.com
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8. EXPRESS
// load dependencies
var express = require(‘express’);
var app = express.createServer();
// define routes, send JSON
app.get(‘/posts’, function(req, res) {
res.send({title: ‘this is a post’});
});
// use templating
app.get(‘/posts/:id’, function(req, res) {
res.render(‘post’, {title: ‘this is a post’});
});
Sunday, April 1, 12

9. EXPRESS Pro T
ip!
// separate controller from routes in app.js
var api = require(‘./controllers/api.js’);
app.get(‘/posts’, api.getPosts);
// have functionality reside in controllers/api.js
exports getPosts = function(req, res) {
res.send({title: ‘this is a post’});
});
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10. ASYNC Esca
Callb ping
ack
Hell™
// separate controller from routes in app.js
fs.stat('/awesome/file', function (err, stats) {
parseData(stats, function(err, data) {
db.insert(data, function(err, result) {
// do something with error or result
});
});
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11. ASYNC
‣ Control flow library (waterfall, series,
parallel)
‣ Functional Programming methods
(filter, map, reduce, forEach)
‣ Alternatives include (Step, Flow-js,
node-promise)
‣ https://github.com/caolan/async
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12. ASYNC
async.waterfall([
function(callback){
fs.stat('/awesome/file', callback)
},
function(stats, callback){
parseData(stats, callback);
},
function(data, callback){
db.insert(json, callback);
}
],
// optional final callback to run once all functions have completed
function (err, result) {
// if there is an error it ends up here
// otherwise this is the result of the db insert
console.log(result);
});
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13. REQUEST
‣ Sane HTTP requests
‣ Streaming Support
‣ Oauth signing
‣ Convenience methods
‣ https://github.com/mikeal/request
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14. REQUEST
// simple HTTP ‘GET’ request
var request = require(‘request’);
request.get('http://api.twitter.com/1/statuses/public_timeline.json',
function(error, response, body) {
console.log(body);
});
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15. MONGOOSE
‣ MongoDB = Document Oriented
Database
‣ Mongoose = MongoDB ODM
‣ Easy to define and query models
‣ http://mongoosejs.com/
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16. MONGOOSE
// define a model
var mongoose = require('mongoose'),
Schema = mongoose.Schema,
ObjectId = Schema.ObjectId;
var projectSchema = new Schema({
name: String,
git_url: String,
user_id: {type: ObjectId, required: true, index: true},
private: {type: Boolean, default: true},
createdOn: {type: Date, default: Date.now},
});
module.exports = mongoose.model('Project', projectSchema);
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17. MONGOOSE
// use a model
var Project = require(‘project.js’);
// Find objects
Project.find({ user_id: id}, [‘name’,‘createdOn’], {sort: {'createdOn': -1}},
function(err, projects) {
// do something with array of projects
});
// Retrieve a single object
Project.findOne({ name: ‘mies’}, function(err, project) {
// do something with the project
});
// Create new Project
p = new Project({name: ‘mies’...}).save();
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18. OTHERS
‣ nodeenv - sandbox node environments
(https://github.com/ekalinin/nodeenv)
‣ socket.io - cross-browser websockets
(http://socket.io)
‣ aws2js - Amazon Web Services module
(https://github.com/SaltwaterC/aws2js)
‣ underscore.js - Functional Programming utilities
(http://documentcloud.github.com/underscore/)
‣ Custom NPM install urls:
"dependencies": {
"everyauth": "git://github.com/mies/everyauth.git"
}
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19. QUESTIONS?
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