app2-api/server.js

#!/usr/bin/env node
'use strict';

const http = require('http');
const { assign, toLower } = require('lodash');

const config = require('./config');
const { express, logger, models } = require('./core');

const currentState = assign({
    launchedAt: Date.now(),
    appPath: process.cwd(),
    host: process.env.HOST || process.env.HOSTNAME || 'localhost',
    port: process.env.PORT || 1337,
    environment: toLower(process.env.NODE_ENV) || 'development',
    connections: {}
}, config);

function stop(server) {
    // Destroy server and available connections.
    if (server) {
        server.close();
    }

    process.send('stop');
    // Kill process.
    process.exit(1);
}

const server = http.createServer(express);
server.on('connection', conn => {
    const key = conn.remoteAddress + ':' + conn.remotePort;
    currentState.connections[key] = conn;

    conn.on('close', () => {
        delete currentState.connections[key];
    });
});

server.on('error', err => {
    if (err.code === 'EADDRINUSE') {
        logger.debug(`⛔️ Server wasn't able to start properly.`);
        logger.error(`The port ${err.port} is already used by another application.`);
        stop(server);
        return;
    }

    console.error(err);
});

try {
    models.sequelize.sync().then(() => {
        // Launch server.
        server.listen(currentState.port, (err) => {
            if (err) {
                logger.debug(`⚠️ Server wasn't able to start properly.`);
                logger.error(err);
                return stop(server);
            }

            logger.info('Time: ' + new Date());
            logger.info('Launched in: ' + (Date.now() - currentState.launchedAt) + ' ms');
            logger.info('Environment: ' + currentState.environment);
            logger.info('Process PID: ' + process.pid);
            //logger.info(`Version: ${this.config.info.strapi} (node v${this.config.info.node})`);
            logger.info('To shut down your server, press <CTRL> + C at any time');
            logger.info(`⚡️ Server: http://${currentState.host}:${currentState.port}`);
            
        });
    });
} catch (err) {
    logger.debug(`⛔️ Server wasn't able to start properly.`);
    logger.error(err);
    console.error(err);
    stop(server);
}