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https://github.com/koajs/resourcer

A simple resource directory mounter for koa.
https://github.com/koajs/resourcer

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A simple resource directory mounter for koa.

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# resourcer



A simple resource directory mounter for [koa](http://koajs.com).



[![Build Status](https://travis-ci.org/koajs/resourcer.svg?branch=master)](https://travis-ci.org/koajs/resourcer)

[![Coverage Status](https://img.shields.io/coveralls/koajs/resourcer.svg)](https://coveralls.io/r/koajs/resourcer)

[![npm](http://img.shields.io/npm/v/koa-resourcer.svg)](https://www.npmjs.org/package/koa-resourcer)



```js

var koa = require('koa');

var resource = require('koa-resourcer');



var app = koa();

resource(app, join(__dirname, 'resources') [, callback])

app.listen();

```



The idea behind `koa-resourcer` is complete modularity within your

koa app. Each directory can be a stand-alone koa application with all

it's own tests, docs, dependencies, etc. `koa-resourcer` makes it easy to

mount these apps if you follow a simple directory pattern.



- [directory structure](#directory-structure)

- [config.json](#configjson)

- [callbacks](#callbacks)

- [installation](#installation)

- [development](#development)

- [sponsored by](#sponsored-by)

- [license](#license)



### Directory structure



Say we have the following directory structure:



```

resources/

|-- v1/users/

|   |-- config.json

|   `-- app.js

|-- v1/products/

|   |-- config.json

|   |-- makefile

|   |-- index.js

|   |-- lib/

|   |   `-- utils.js

|   `-- test/

|       `-- index.js

`-- v2/users/

    |-- config.json

    `-- fun.js

```



We have three independent apps here. `v1/users/app.js`, `v1/products/index.js` and

`v2/users/fun.js`. We could use `koa-mount` directly and be done with it but

that requires the parent application to know where all the apps are and the paths

on which they should be mounted.



```js

var koa = require('koa')

var mount = require('koa-mount')

var app = koa()



var v1users = require('./v1/users/app.js')

app.use(mount('v1/users/', v1users))



var v2users = require('./v2/users/fun.js')

app.use(mount('v2/users/', v2users))



var v1products = require('./v1/products/')

app.use(mount('v1/products/', v1products))



// and so on, and so on, for each of your sub apps....



app.listen()

```



With `koa-resourcer` you let your directory structure and some simple

config files do the talking for you, keeping your parent application

peacefully oblivious.



```js

var koa = require('koa')

var join = require('path').join

var resource = require('koa-resourcer')

var app = koa()



resource(app, join(__dirname, 'resources'))



app.listen()

```



#### config.json



Each application directory must contain a `config.json` file. The `config.json` file

is used to discover the location of the application source code. This information

is stored in it's `source` property.



```js

// resources/v1/users/config.json



{ "source": "app.js" }

```



By relying on the directory structure to determine route paths, `koa-resourcer`

will automatically mount `app.js` on `/v1/users/` for you. If this path isn't

quite what you want, `koa-resourcer` also supports configuring your path names in

the `config.json` files.



```js

// resources/v1/users/config.json



{ "source": "app.js", "path": "user" }

```



By adding the `path` property to our configuration, `koa-resourcer` will now mount

the app on `/v1/user/`.



### Callbacks



If you pass a callback function as the third argument to `koa-resourcer`, it

will be executed for each mounted application passing an object containing

the path and application resource.



```js

var koa = require('koa')

var join = require('path').join

var resource = require('koa-resourcer')

var app = koa()



resource(app, join(__dirname, 'resources'), function(o){

  console.log('mounted %s', o.path, o.resource)

})



app.listen()

```



### Installation



```

npm install koa-resourcer --save

```



### Development



#### running tests



- `make test` runs tests

- `make test-cov` runs tests + test coverage

- `make open-cov` opens test coverage results in your browser



#### verbose logging



`koa-resourcer` supports the `debug` module for help during development.

Enable verbose logging by setting your `DEBUG` env variable like so:



````

DEBUG=koa-resourcer* npm test

```



## Sponsored by



[Pebble Technology!](https://www.pebble.com)



## License



[MIT](https://github.com/koajs/resourcer/blob/master/LICENSE)