bcgov/document-generation-showcase

#!/usr/bin/env node

/** Module dependencies */
const config = require('config');
const http = require('http');

const app = require('../app');
const log = require('../src/components/log')(module.filename);

/** Normalize a port into a number, string, or false. */
const 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. */
const 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':
      log.error(bind + ' requires elevated privileges', { function: 'onError' });
      process.exit(1);
      break;
    case 'EADDRINUSE':
      log.error(bind + ' is already in use', { function: 'onError' });
      process.exit(1);
      break;
    default:
      throw error;
  }
};

/** Event listener for HTTP server "listening" event. */
const onListening = () => {
  const addr = server.address();
  const bind = typeof addr === 'string' ?
    'pipe ' + addr :
    'port ' + addr.port;
  log.info('Listening on ' + bind, { function: 'onListening' });
};

/** Get port from environment and store in Express. */
const port = normalizePort(config.get('server.port'));
app.set('port', port);

/** Create HTTP server. */
const server = http.createServer(app);

/** Listen on provided port, on all network interfaces. */
server.listen(port);
server.on('error', onError);
server.on('listening', onListening);