@dynacom/blaze/server.js

const mime = require('mime-types');
const path = require('path');
const fs = require('fs');
const { spawn } = require('child_process');
const { promisify } = require('util');
const pidusage = require('pidusage');
const selfupdate = require('selfupdate');
const package = require('./package.json');

let processPath = path.join(__dirname, '/config/process.json');

let pidFile = fs.existsSync(processPath) ? require('./config/process.json') : { ids: {} }

module.exports.reload = () => {
    Object.keys(require.cache).forEach(key => { delete require.cache[key] });
}

module.exports.start = () => {
    if (pidFile.ids.master) {
        // add a check for if the pid is truly found and is blaze
        console.log('Blaze Web Server already running');
    } else {
        console.log('Starting Blaze Web Server');
        let daemon = spawn('node', ['start.js'], { detached: true });
        daemon.on('error', (err) => {
            console.error(err);
        });
        pidFile.ids.master = daemon.pid;
        savePID();
        process.exit();
    }
}

module.exports.stop = () => {
    // Only try if the pid is found and is blaze
    if (!pidFile.ids.master) {
        console.log('Blaze Web Server is not running');
    } else {
        console.log('Stopping Blaze Web Server');
        try {
            process.kill(pidFile.ids.master, ["SIGTERM"]);
        } catch (error) {
            console.error(error);
        }
    }
    delete pidFile.ids.master;
    savePID();
}

module.exports.restart = () => {
    module.exports.stop();
    module.exports.start();
}

module.exports.version = () => {
    console.log('v' + package.version);
}

module.exports.update = async() => {
    let isUpdated = await promisify(selfupdate.isUpdated)(package);
    if (isUpdated) {
        console.log('Blaze Web Server is already up to date');
    } else {
        let newVersion = await promisify(selfupdate.update)(package);
        console.log('The package was updated to version: ' + newVersion);
    }
}

module.exports.help = (commands) => {
    console.log('blaze web server v' + package.version + '\n');
    console.log('Commands:');
    let strLength = 4 + commands.reduce(function(longestCommand, schema) {
        return Math.max(longestCommand, schema.command.length);
    }, 0);

    commands.forEach(
        schema => {
            console.log('  blaze ' + (schema.command.padEnd(strLength)) + schema.help);
        }
    );
}

function savePID() {
    fs.writeFileSync(processPath, JSON.stringify(pidFile));
}