openhim-core/src/config/config.js

The OpenHIM core application that provides logging and routing of http requests

import nconf from 'nconf'
import path from 'path'
import fs from 'fs'
import logger from 'winston'

export const appRoot = path.resolve(__dirname, '../..')

/*
 * Define the default constructor
 */
function Config () {
  // Get the argument-value to use
  nconf.argv().env('_')

  // don't read NODE:ENV from nconf as it could be overwritten by any env var starting with 'NODE_'
  const environment = process.env.NODE_ENV

  const conf = nconf.get('conf')

  // Load the configuration-values
  // user specified config override
  if (conf) {
    if (!fs.existsSync(conf)) {
      logger.warn(`Invalid config path ${conf}`)
    }
    nconf.file('customConfigOverride', conf)
  }

  // environment override
  if (environment) {
    const envPath = `${appRoot}/config/${environment}.json`
    if (!fs.existsSync(envPath)) {
      logger.warn(`No config found for env ${environment} at path ${envPath}`)
    }
    nconf.file('environmentOverride', `${appRoot}/config/${environment}.json`)
  }

  // load the default config file
  nconf.file('default', `${appRoot}/config/default.json`)

  // Return the result
}

/*
 * This function return the value that was set in the key-value store
 */
Config.prototype.get = key => nconf.get(key)

/*
 * This function constructs a new instanse of this class
 */
export const config = new Config()