Heroku pop-behind-the-sense

About me
Ben Lin
Co-founder at WOOMOO INC.
A full time entrepreneur & JavaScript lover
Fall in love with node.js on Jun 2011

dreamerslab.com
ben@dreamerslab.com
twitter.com/dreamerslab
github.com/dreamerslab

About me

COKE - Full stack node.js MVC framework
Vodka - Functional testing framework
Thunder - The lightning fast template engine

And a lot more on
https://github.com/dreamerslab

Agenda

1. Software architecture
2. Frameworks & Libraries
3. Application stack
4. Packages
5. Scaling node.js
6. Deployment
7. Q & A

Software architecture

Home brewed node.js MVC framework - COKE

Why node.js?
It’s fast and easy to scale horizontally

Restful router for api & web server

module.exports = function ( map ){
map.get( 'api', 'api/home#index' );
map.namespace( 'api', function ( api ){
api.resources( 'users', {
only : [ 'create', 'show', 'update', 'destroy' ]
}, function ( users ){
users.get( 'projects/:id/full', 'user_projects#full' );
users.resources( 'user_projects', {
path : 'projects',
only : [ 'create', 'index', 'show', 'update', 'destroy' ]
});

// more routes ......
});
};

Validation make sure all the arguments are correct before get into controllers

var form = require( 'express-form2' );
var field = form.field;
var r = require( '../regex' );

module.exports = {

validate_create : form(
field( 'client_id' ).required().is( r.id, '01' ),
field( 'mockup_id' ).required().is( r.id, '01' ),
field( 'format' ).required().is( r.img, '014' )
),

validate_index : form(
field( 'mockup_id' ).required().is( r.id, '01' )
),

validate_destroy : form(
field( 'mockup_id' ).required().is( r.id, '01' ),
field( 'id' ).required().is( r.id, '01' )
)
};

Controller Only do data exchange & ﬂow control

module.exports = Application.extend({

init : function ( before, after ){
before( this.is_authenticated );
before( this.validate_create );
before( this.has_file );
before( this.is_validate );
},

create : function ( req, res, next ){
var self = this;

ProjectImage.insert( req.form, next,
function (){
self.forbidden( res );
},
function (){
self.frozen( res );
},
function ( img ){
self.created( res, img );
});
}
});

Model
Handel business logic and model relations, we add a wrapper on mongoose the ODM.

module.exports = {
virtuals : [ 'image' ],
hooks : {
pre : {
save : [ common.mark_new ],
remove : [ common.backup_to( 'BakMockupImage' ), hooks.remove_from_mockup ]
},
post : {
save : [ hooks.add_to_mockup, common.add_to_auth( 'images' )],
remove : [ hooks.remove_from_s3 ]
}
},
statics : {
insert : function ( args, next, forbidden, frozen, created ){ ... },
index : function ( args, next, no_content, forbidden, ok ){ .. },
destroy : function ( args, next, no_content, forbidden, frozen, deleted ){ ... }
},
methods : {
is_owner : function ( user_id ){ ... },
created : function (){ ... },
gen_url : function ( format ){ ... }
}
};

View
We use the fastest template engine thunder ( home brewed )

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title><?= it.title ?></title>
<meta name="keywords" content="<?= it.keywords || '' ?>" />
<meta name="description" content="<?= it.description || '' ?>" />

<?= it.css( it.styles ) ?>
</head>
<body>
<? it.reset_asset_host(); ?>
<?= it.body ?>
<?= it.js( it.scripts ) ?>
</body>
</html>

Libraries
Extract reusable codes that is not relevant to model

Scaling node.js
Start small with built-in static server, node.js app & database all on the same server.

Scaling node.js
Use nginx as static server for better performance.

Scaling node.js
Use nginx as as proxy server as well to load balance requests.
The number of node.js app instance depends on how many CPU cores on the machine.

Scaling node.js
Split static ﬁles to different server for easier maintenance.

Scaling node.js
Use aws S3 for easier setup and maintenance.

Scaling node.js
Split database to another server. Make the node.js app server an unit.

Scaling node.js
Add a load balancer, add more app unit as the site scales up.

Scaling node.js
Add replica set if the database hits its limit.

Scaling node.js
Add CDN for static ﬁles for cross reign performance.

Scaling node.js
Split app to difference services as it scales up. Previous scaling steps apply to those services too.

Deployment
With ssh, git; The server must stop during deployment.

Deployment
With ssh, git; 0 downtime deployment is possible since we have more than 1 instance( repo ).

Deployment
With ssh, git; Split static ﬁle makes it easier to deploy with multi instance( repo ) app.

Deployment
Deploying with multi machine it’s better to use image ﬁles on aws ec2.

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