Creating Scalable Node.js Applications

Project Organization!

Reusable Modules

• Organize code into modules
  • Model
  • Routes
  • Helper/Util
  • Logging

grunt-link

grunt-link allows the linking of local modules.

To add grunt link to your project

npm install --save-dev grunt-link

And in your Gruntfile

grunt.loadNpmTask("grunt-link");

Example

Open project1.

Run

npm install
grunt link

Configuration

• Multiple files
• Different environments
• Overrides for development
• Single point of entry

Gofigure

gofigure is a module that loads your configuration files and handles the merging and monitoring of configuration properties based on the current environment.

To add gofigure to your project

npm install --save gofigure

Example

Building off of the previous example lets add some logic to our config module!

Logging

comb

At c2fo we use a module called comb which contains utilities that we use in all of our projects.

In this example we will use the comb logger.

comb.logger

npm install --save comb

Example

Lets add some logging to our modules.

Scaling Cores and Machines

Worker Processes

Cluster

Node has a core module called cluster which allows a scaling across cores but has some drawbacks.

werker

werker is a module for creating a pool of werker processes for scaling across cores.

Worker Queues

RabbitMQ

• Robust messaging for applications
• Easy to use
• Runs on all major operating systems
• Supports a huge number of developer platforms
• Open source and commercially supported

hare

hare is a wrapper around node-amqp that makes setting up different types messaging configurations easy.