index.js

require('dotenv').config()
const app = require('./server/app')

/**
 * Get port from environment and store in Express.
 */

const port = normalizePort('6789')
app.set('port', port)

/**
 * Normalize a port into a number, string, or false.
 */

function normalizePort(val) {
  const port = parseInt(val, 10)

  if (isNaN(port)) {
    // named pipe
    return val
  }

  if (port >= 0) {
    // port number
    return port
  }

  return false
}

/**
 * Event listener for HTTP server 'error' event.
 */

function onError(error) {
  if (error.syscall !== 'listen') {
    throw error
  }

  const bind = typeof port === 'string'
    ? 'Pipe ' + port
    : 'Port ' + port

  // handle specific listen errors with friendly messages
  switch (error.code) {
    case 'EACCES':
      console.error(bind + ' requires elevated privileges')
      process.exit(1)
      break
    case 'EADDRINUSE':
      console.error(bind + ' is already in use')
      process.exit(1)
      break
    default:
      throw error
  }
}

/**
 * Event listener for HTTP server 'listening' event.
 */

function onListening() {
  const addr = server.address()
  const bind = typeof addr === 'string'
    ? 'pipe ' + addr
    : 'http://localhost:' + addr.port
  console.info('Listening on ' + bind)

}

const server = app.listen(port)

// process.on('SIGINT', () => {
//   console.info('SIGINT signal received.')
//   server.close(async function (err) {
//     process.exit(0)
//   })
// })
//
// process.on('exit', function () {
//   console.info('Closing connections...')
//   app.closeDb()
//   console.info('Closed.')
// })

/**
 * Listen on provided port, on all network interfaces.
 */

server.on('error', onError)
server.on('listening', onListening)