devicemanager snippet.js

function DeviceManager(driverFactory) {
    var devices = {};

    function addDevice(name, driver, config){
        if(devices[name] !== undefined){
            return Promise.reject(new Error(`Device with name of ${ name } already exists`));
        }

        driverFactory.create(driver, config, {})
            .then(
                 function(driverInstance){
                       devices[name] = driverInstance;
                 });
    }

    function exec(deviceName, command, params){
        devices[deviceName].commands[command].fn(params);
    }

    return({addDevice, devices, exec});
}

driverFactory

module.exports  = function DriverFactory(drivers = {}){
    function create(driver, config, node){
      return new Promise((resolve, reject)=>{
        if(drivers[driver] == undefined){
          reject(new Error(`Driver ${ driver } does not exist`))
        }
        resolve(drivers[driver](config, node));

      })
    }

    return({create});
}