MusareReact/backend/index.js

'use strict';

process.env.NODE_CONFIG_DIR = `${__dirname}/config`;

const async = require('async');
const fs = require('fs');


const Discord = require("discord.js");
const client = new Discord.Client();
const db = require('./logic/db');
const app = require('./logic/app');
const mail = require('./logic/mail');
const api = require('./logic/api');
const io = require('./logic/io');
const stations = require('./logic/stations');
const songs = require('./logic/songs');
const playlists = require('./logic/playlists');
const cache = require('./logic/cache');
const notifications = require('./logic/notifications');
const punishments = require('./logic/punishments');
const logger = require('./logic/logger');
const tasks = require('./logic/tasks');
const i18n = require('./logic/i18n');
const config = require('config');

let currentComponent;
let initializedComponents = [];
let lockdownB = false;

process.on('uncaughtException', err => {
	if (lockdownB || err.code === 'ECONNREFUSED' || err.code === 'UNCERTAIN_STATE') return;
	console.log(`UNCAUGHT EXCEPTION: ${err.stack}`);
});

const getError = (err) => {
	let error = 'An error occurred.';
	if (typeof err === "string") error = err;
	else if (err.message) {
		if (err.message !== 'Validation failed') error = err.message;
		else error = err.errors[Object.keys(err.errors)].message;
	}
	return error;
};

client.on('ready', () => {
	console.log(`Logged in to Discord as ${client.user.username}#${client.user.discriminator}`);
	initialize();
});

client.on('disconnect', (err) => {
	console.log(`Discord disconnected. Code: ${err.code}.`);
});

client.login(config.get('apis.discord.token'));

const logToDiscord = (message, color, type, critical, extraFields, cb = ()=>{}) => {
	let richEmbed = new Discord.RichEmbed();
	richEmbed.setAuthor("Musare Logger", config.get("domain")+"/favicon-194x194.png", config.get("domain"));
	richEmbed.setColor(color);
	richEmbed.setDescription(message);
	//richEmbed.setFooter("Footer", "https://musare.com/favicon-194x194.png");
	//richEmbed.setImage("https://musare.com/favicon-194x194.png");
	//richEmbed.setThumbnail("https://musare.com/favicon-194x194.png");
	richEmbed.setTimestamp(new Date());
	richEmbed.setTitle("MUSARE ALERT");
	richEmbed.setURL(config.get("domain"));
	richEmbed.addField("Type:", type, true);
	richEmbed.addField("Critical:", (critical) ? 'True' : 'False', true);
	extraFields.forEach((extraField) => {
		richEmbed.addField(extraField.name, extraField.value, extraField.inline);
	});
	client.channels.get(config.get('apis.discord.loggingChannel')).send("", { embed: richEmbed }).then(() => {
		cb();
	}).then((reason) => {
		cb(reason);
	});
};

function lockdown() {
	if (lockdownB) return;
	lockdownB = true;
	initializedComponents.forEach((component) => {
		component._lockdown();
	});
	console.log("Backend locked down.");
}

function errorCb(message, err, component) {
	err = getError(err);
	lockdown();
	logToDiscord(message, "#FF0000", message, true, [{name: "Error:", value: err, inline: false}, {name: "Component:", value: component, inline: true}]);
}

let initialized = false;
function initialize() {
	if (!initialized) initialized = true;
	else return;
	async.waterfall([

		// setup our translation
		(next) => {
			currentComponent = 'Translation';
			i18n.init(next);
		},

		// setup our Redis cache
		(next) => {
			currentComponent = 'Cache';
			cache.init(config.get('redis').url, config.get('redis').password, errorCb, () => {
				next();
			});
		},

		// setup our MongoDB database
		(next) => {
			initializedComponents.push(cache);
			currentComponent = 'DB';
			db.init(config.get("mongo").url, errorCb, next);
		},

		// setup the express server
		(next) => {
			initializedComponents.push(db);
			currentComponent = 'App';
			app.init(next);
		},

		// setup the mail
		(next) => {
			initializedComponents.push(app);
			currentComponent = 'Mail';
			mail.init(next);
		},

		// setup the socket.io server (all client / server communication is done over this)
		(next) => {
			initializedComponents.push(mail);
			currentComponent = 'IO';
			io.init(next);
		},

		// setup the punishment system
		(next) => {
			initializedComponents.push(io);
			currentComponent = 'Punishments';
			punishments.init(next);
		},

		// setup the notifications
		(next) => {
			initializedComponents.push(punishments);
			currentComponent = 'Notifications';
			notifications.init(config.get('redis').url, config.get('redis').password, errorCb, next);
		},

		// setup the stations
		(next) => {
			initializedComponents.push(notifications);
			currentComponent = 'Stations';
			stations.init(next)
		},

		// setup the songs
		(next) => {
			initializedComponents.push(stations);
			currentComponent = 'Songs';
			songs.init(next)
		},

		// setup the playlists
		(next) => {
			initializedComponents.push(songs);
			currentComponent = 'Playlists';
			playlists.init(next)
		},

		// setup the API
		(next) => {
			initializedComponents.push(playlists);
			currentComponent = 'API';
			api.init(next)
		},

		// setup the logger
		(next) => {
			initializedComponents.push(api);
			currentComponent = 'Logger';
			logger.init(next)
		},

		// setup the tasks system
		(next) => {
			initializedComponents.push(logger);
			currentComponent = 'Tasks';
			tasks.init(next)
		},

		// setup the frontend for local setups
		(next) => {
			initializedComponents.push(tasks);
			currentComponent = 'Windows';
			if (!config.get("isDocker")) {
				const express = require('express');
				const app = express();
				app.listen(config.get("frontendPort"));
				const rootDir = __dirname.substr(0, __dirname.lastIndexOf("backend")) + "frontend/dist/";
				const rootDirAssets = __dirname.substr(0, __dirname.lastIndexOf("backend")) + "frontend/app/";
				const rootDirLocales = __dirname.substr(0, __dirname.lastIndexOf("backend"));

				app.get("/locales/*", (req, res) => {
					let path = req.path;
					res.set('Cache-Control', 'max-age=8640000000');

					fs.access(rootDirLocales + path, function (err) {
						console.log("Error: ", !!err);
						if (!err) {
							res.sendFile(rootDirLocales + path);
						} else {
							res.redirect("/");
						}
					});
				});

				app.get("/assets/*", (req, res) => {
					const path = req.path;
					res.set('Cache-Control', 'max-age=8640000000');

					fs.access(rootDirAssets + path, function (err) {
						console.log("Error: ", !!err);
						if (!err) {
							res.sendFile(rootDirAssets + path);
						} else {
							res.redirect("/");
						}
					});
				});

				app.get("/*", (req, res) => {
					const path = req.path;

					fs.access(rootDir + path, function (err) {
						if (!err) {
							res.set('Cache-Control', 'max-age=8640000000');
							res.sendFile(rootDir + path);
						} else {
							res.sendFile(rootDir + "index.html");
						}
					});
				});
			}
			if (lockdownB) return;
			next();
		}
	], (err) => {
		if (err && err !== true) {
			lockdown();
			logToDiscord("An error occurred while initializing the backend server.", "#FF0000", "Startup error", true, [{
				name: "Error:",
				value: err,
				inline: false
			}, {name: "Component:", value: currentComponent, inline: true}]);
			console.error('An error occurred while initializing the backend server');
		} else {
			logToDiscord("The backend server started successfully.", "#00AA00", "Startup", false, []);
			console.info('Backend server has been successfully started');
		}
	});
}