src/bin/www.js
#!/usr/bin/env node
/* eslint-disable no-console */
/* eslint-disable indent */
/**
* Module dependencies.
*/
import debug from 'debug';
import http from 'http';
// eslint-disable-next-line import/extensions
import app from '../app.js';
/**
* Normalize a port into a number, string, or false.
*/
const normalizePort = (val) => {
const port = parseInt(val, 10);
if (Number.isNaN(port)) {
// named pipe
return val;
}
if (port >= 0) {
// port number
return port;
}
return false;
};
/**
* Get port from environment and store in Express.
*/
const port = normalizePort(process.env.PORT || '5000');
app.set('port', port);
/**
* Create HTTP server.
*/
const server = http.createServer(app);
/**
* Event listener for HTTP server "error" event.
*/
const onError = (error) => {
if (error.syscall !== 'listen') {
throw error;
}
const bind = typeof port === 'string' ? `Pipe ${port}` : `Port ${port}`;
// handle specific listen errors with friendly messages
switch (error.code) {
case 'EACCES':
console.error(`${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.
*/
const onListening = () => {
const addr = server.address();
const bind = typeof addr === 'string' ? `pipe ${addr}` : `port ${addr.port}`;
debug(`Listening on ${bind}`);
};
/**
* Listen on provided port, on all network interfaces.
*/
server.listen(port);
server.on('error', onError);
server.on('listening', onListening);