GConf

Global Configuration for the masses.

GConf

  const gconf_instance = new GConf();

The GConf Object is the base and main API for the library.

The constructor for the class can register modifiers and providers (Note currenty there can be only one provider) from the options object.

options

  {
    provider: {
      ...providerOptions
    },
    modifierA: true,
    modifierB: {
      ...modifierOptions
    }
  }

The options object is based by the key being the Name of the provider or modifier, and the Object being the options Object for the provider's/modifier's constructor.

example config for creating a memory provider with an env modifier:

  {
    memory: {
      dev: {
        foo: 'bar'
      },
      prod: {
        foo: 'bar2000'
      }
    },
    env: {
      prefix: 'CONF'
    },
  }

this gives me a object { foo: 'bar' } for requesting dev and { foo: 'bar2000' } for prod.

GConf.get(domain, path)

this is the function to use to get the data from the config, meaning (with the example config above) you will get

 
  gconf_instance.get('dev') // { foo: 'bar' }
  gconf_instance.get('dev', 'foo') // 'bar'
 

domain is the domain (maybe env or any other generlisation) where to look, defined in provider's constructor (options) path is for geting specific parts of the config and not the entire thing

GConf.meta

This is a meta-options for gconf, for example the default domain when none is given

gconf.registerProvider(provider, options) & gconf.registerModifier(modifier, options)

Are a way to register modifiers and providers not in the constructor

GConf.default

Allows to acess functions with default domain, this defaults to 'default' =|

 
// lets say in our domain named 'default' has { foo: 'bar' }
 
gconf_instance.get('default', 'foo'); // -> 'bar'
gconf_instance.default.get('foo'); // -> 'bar'
 
and if we change it to 'dev' it should be like:
 
gconf_instance.meta.default_domain = 'dev';
 
gconf_instance.get('dev') === gconf_instance.default.get();
 

Singleton Registration

The library implements a singleton factory to save the loaded config.

 
var options = {
  // ...
}
 
gconf_instance = new GConf(options);
 
gconf.load(gconf_instance); // The 'load' will retrive ither GConf instance
 
gconf.load(options); // or the constructor params for the GConf instance
 

and then you can access it from any part the application

 
var gconf = require('gconf');
 
gconf.instance // == a gconf instance created in 'load'.
 

.gconfrc

Gconf can get the initial configuration for the singleton instance from a .gconfrc file (it's a json) aswell as external plugin loading

{
  "plugins": ["plugin-a", "plugin-b"],
  "config": {
    "gconf": "config"
  }
}
 

With .gconfrc you can use require('gconf/default'); // The same as require('gconf').instance.default

Providers

Memory Provider

Made to load configuration from an object.

provider name: memory

  memory: {
    domain: {
      ...objectForEnvConfig
    }
  }

returns the object corresponding to the requested domain

File Provider

File based fetching of config with json and yaml support

provider name: file

file: {
  dev: {
    path: './config.dev.json',
    watch: true
  },
  prod: {
    path: './config.prod.json',
    watch: false
  }
}

Will load yaml and json files and watch will keep them up to date

Modifiers

Env Modifier

modifies the base config with Enviroment Variables

modifier name: env

{prefix}{splitter}{path} example:

GCONF_a_b_c = 'd' => { a: { b: { c: 'd' } } } 
/// when GCONF is prefix and '_' is splitter

Splitter and Prefix are defined in the modifier's constructor

Argv Modifier

modifies the base config with the arguments provided in run

modifier name: argv

the splitter is .

so:

node test.js --foo.bar=2000 // config => { foo: { bar: 2000 } }

Extend API

Creating modifier / provider

There are two classes in gconf.components, the Modifier and Provider classes are the base classes for all providers and modifiers accordingly

By extending the base class you can create modifiers or providers

 
class NewProvider extends Provider{
  
  // Override the base function
  request(domain, path){
    // domain is the config domain, and the path is a path to get to the specified value, both are optional
  }
 
}
 

then after creating a class you need to regiter it, this you do through the components.registerProvider('newProvider', NewProvider) and components.registerModifier('newMofifier', NewMofifier) where you need to send the name and class (keep in mind, the class and not an instance). After registration you can use it like every other provider/modifier

Credits

Created by Dmitry Dodzin under MIT license.