backendless-consul-config-provider/src/index.js

Consul Configs provider for Backendless' JS Servers

'use strict'

const Utils = require('./utils')
const ConsulApi = require('./consul-api')
const Logger = require('./logger')

const BL_PROPERTY_PREFIX = 'BL_PROPERTY_'

const COMMON_CONFIG = {
  apiUrl     : 'config/server/httpAddress',
  apiHost    : 'config/server/internalHost',
  apiPort    : 'config/server/internalPort',
  apiProtocol: 'config/server/internalProtocol',
  apiUri     : 'config/server/internalUri',
  repoPath   : 'config/repository/location',
}

exports.provide = ({ url, aclToken, serviceKey, extraKeys }) => {
  aclToken = aclToken || process.env.BL_CONSUL_ACL_TOKEN

  delete process.env.BL_CONSUL_ACL_TOKEN

  Logger.info('====================================================================')
  Logger.info('===================== CONSUL CONFIG PROVIDER =======================')
  Logger.info('Run Consul Configs provider')

  const consulApi = new ConsulApi(url, aclToken)

  const envConfigs = {}

  Object
    .keys(process.env)
    .forEach(key => {
      if (key.startsWith(BL_PROPERTY_PREFIX)) {
        envConfigs[key.replace(BL_PROPERTY_PREFIX, '').replace(/_/g, '/')] = process.env[key]
      }
    })

  Logger.info(`Additional config from ENV:${ JSON.stringify(envConfigs) }`)

  return Promise.resolve()
    .then(() => loadServiceConfigs({ consulApi, serviceKey, envConfigs }))
    .then(serviceConfig => buildConfig({ consulApi, serviceConfig, extraKeys, envConfigs }))
    .then(config => {
      Logger.info(`Completed building configuration from Consul`)
      Logger.info(JSON.stringify(config))
      Logger.info('===================== CONSUL CONFIG PROVIDER =======================')
      Logger.info('====================================================================')

      return config
    })
}

function loadServiceConfigs({ consulApi, serviceKey, envConfigs }) {
  Logger.info('Check if Consul is ready for work...')

  return Promise.resolve()
    .then(() => consulApi.loadItemsTreeByKey(serviceKey, envConfigs))
    .catch(error => {
      Logger.error(`Could not load or build configs, wait a little and try again...`, error)

      return Utils.wait(5000).then(() => loadServiceConfigs({ consulApi, serviceKey, envConfigs }))
    })
}

function buildConfig({ consulApi, serviceConfig, extraKeys, envConfigs }) {
  return Promise
    .all([
      consulApi.loadItemsTreeBySchema(COMMON_CONFIG, envConfigs),
      consulApi.loadItemsTreeBySchema(extraKeys, envConfigs)
    ])
    .then(([commonConfig, extraConfig]) => {
      let result = {}

      result = Utils.mergeObjects(result, commonConfig)
      result = Utils.mergeObjects(result, extraConfig)
      result = Utils.mergeObjects(result, serviceConfig)

      return result
    })
}