config-support.js

'use strict';

const fs   = require('fs');
const logr = require('em-logr');

const validLevels = ['trace', 'debug', 'info', 'warn', 'error', 'fatal'];
const isValidLogLevel = level => validLevels.includes(level);

const appPortCacheFile = './APP_PORT.cache';

const getPortFromFile = () => {
  if (fs.existsSync(appPortCacheFile)) {
    try {
      const portNumber = +fs.readFileSync(appPortCacheFile).toString();
      return portNumber || undefined;
    } catch (e) {
      logr.debug(e);
    }
  }
};

const savePortToFile = (portNumber) => {
  try {
    fs.writeFileSync(appPortCacheFile, portNumber);
  } catch (e) {
    logr.error(e);
    process.exit(1);
  }
};

module.exports = {
  isValidLogLevel,
  getPortFromFile,
  savePortToFile,
  get appPortCacheFile() { return appPortCacheFile; },
  get validLevels() { return JSON.parse(JSON.stringify(validLevels)); },
};