Middleware Chain

Chain your node.js functions.

Middleware Chain allows you to simply chain your syncronous / asyncronous middleware functions. It works in a very similar way to how express handles middleware.

Works really well using the consign module to autoload your scripts.

Usage

chain([context], chain);

var chain = require('middleware-chain');
 
chain([ one, two, three ]);
 
// Optionally pass in context
var app = { hello: 'world' };
chain(app, [ one, two, three ]);

Please check out the examples or test folder for more!

Installation

$ npm install middleware-chain

Features

• Chain functions / middleware
• Works with both asyncronous and syncronous functions
• Brings structure to scripts with a lot of callbacks
• Allows modifiable flow
• Ability to pass in initial context
• Chains are nestable
• Ability for parrallel chains
• Test driven
• Fast, Light-weight with no external dependencies

Context parameter

The optional context object is passed in as the first parameter, it can be an object containing anything you'd like to access throughout your middleware chain.

Chain parameter

The chain parameter is required, it's an array containing functions to be called in order.

Tests

To run the test suite, first install the dependencies, then run npm test:

$ npm install
$ npm test

Full Example

var chain = require('middleware-chain');
 
function one(context, next) {
  setTimeout(function() {
    context.one = 'Hello';
    console.log('Hello from one', context);
    return next();
  }, 1000);
}
 
function two(context, next) {
  setTimeout(function() {
    context.two = 'Hello';
    console.log('Hello from two', context);
    return next();
  }, 1000);
}
 
function three(context, next) {
  setTimeout(function() {
    context.three = 'Hello';
    console.log('Hello from three', context);
  }, 1000);
}
 
chain([ one, two, three ]);

Output

Hello from one
Hello from two
Hello from three

License

MIT