www.js

www.js

#!/usr/bin/env node

import debugFactory from "debug";
import dotenv from "dotenv";
import http from "http";
import app from "./../src/app.js";

const debug = debugFactory(process.env.DEBUG);

/**
 * Enable "dotenv" extension.
 */
dotenv.config();

/**
 * Get port from environment and store in Express.
 */
const port = normalizePort(process.env.PORT);
app.set("port", port);

/**
 * Create an 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);

/**
 * Normalize a port into a number, string or false.
 *
 * @param {*} value
 * @returns {number|string|false}
 */
function normalizePort(value) {
    const port = parseInt(value, 10);

    // Named pipe
    if (isNaN(port)) {
        return value;
    }

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

    return false;
}

/**
 * Event listener for HTTP server "error" event.
 *
 * @param {*} error
 * @throws {Error}
 */
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);

        case "EADDRINUSE":
            console.error(`${bind} is already in use`);
            process.exit(1);

        default:
            throw error;
    }
}

/**
 * Event listener for HTTP server "listening" event.
 */
function onListening() {
    const address = server.address();
    const bind = typeof address === "string" ? `pipe ${address}` : `port ${address.port}`;

    debug(`Listening on ${bind}`);
}