www http server file

www.ts

import * as http from 'http';

import logger from '../utils/winston-logger';
import App from '../index';

const server = http.createServer(App);

const normalizePort = (val: number|string): number|string|boolean => {
  const normolizedPort = (typeof val === 'string') ? parseInt(val, 10) : val;
  if (isNaN(normolizedPort)) {
    return val;
  }
  
  if (normolizedPort >= 0) {
    return normolizedPort;
  }

  return false;
};

const port = normalizePort(process.env.PORT || 3000);
App.set('port', port);

// handle all kind of server errors
const onError = (error: NodeJS.ErrnoException) => {
  if (error.syscall !== 'listen') { throw error; }
  const bind = (typeof port === 'string') ? 'Pipe ' + port : 'Port ' + port;
  switch (error.code) {
    case 'EACCES':
      logger.error(`${bind} requires elevated privileges`);
      process.exit(1);
      break;
    case 'EADDRINUSE':
      logger.error(`${bind} is already in use`);
      process.exit(1);
      break;
    default:
      throw error;
  }
};

const onListening = () => {
  const addr = server.address();
  const bind = (typeof addr === 'string') ? `pipe ${addr}` : `port ${addr.port}`;
  logger.info(`Listening on ${bind}`);
};

server.listen(port);
server.on('error', onError);
server.on('listening', onListening);