mirror of https://github.com/lissy93/dashy
96 lines
3.8 KiB
JavaScript
96 lines
3.8 KiB
JavaScript
/**
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* Note: The app must first be built (yarn build) before this script is run
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* This is the main entry point for the application, a simple server that
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* runs some checks, and then serves up the app from the ./dist directory
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* Also includes some routes for status checks/ ping and config saving
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* */
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/* Include required node dependencies */
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const serveStatic = require('serve-static');
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const connect = require('connect');
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const util = require('util');
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const dns = require('dns');
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const os = require('os');
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const bodyParser = require('body-parser');
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/* Kick of some basic checks */
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require('./services/update-checker'); // Checks if there are any updates available, prints message
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require('./services/config-validator'); // Include and kicks off the config file validation script
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/* Include helper functions and route handlers */
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const pingUrl = require('./services/ping'); // Used by the status check feature, to ping services
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const saveConfig = require('./services/save-config'); // Saves users new conf.yml to file-system
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const printMessage = require('./services/print-message'); // Function to print welcome msg on start
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const rebuild = require('./services/rebuild-app'); // A script to programmatically trigger a build
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/* Checks if app is running within a container, from env var */
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const isDocker = !!process.env.IS_DOCKER;
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/* Checks env var for port. If undefined, will use Port 80 for Docker, or 4000 for metal */
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const port = process.env.PORT || (isDocker ? 80 : 4000);
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/* Attempts to get the users local IP, used as part of welcome message */
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const getLocalIp = () => {
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const dnsLookup = util.promisify(dns.lookup);
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return dnsLookup(os.hostname());
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};
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/* Gets the users local IP and port, then calls to print welcome message */
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const printWelcomeMessage = () => {
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getLocalIp().then(({ address }) => {
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const ip = address || 'localhost';
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console.log(printMessage(ip, port, isDocker)); // eslint-disable-line no-console
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});
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};
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/* Just console.warns an error */
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const printWarning = (msg, error) => {
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console.warn(`\x1b[103m\x1b[34m${msg}\x1b[0m\n`, error || ''); // eslint-disable-line no-console
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};
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/* A middleware function for Connect, that filters requests based on method type */
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const method = (m, mw) => (req, res, next) => (req.method === m ? mw(req, res, next) : next());
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try {
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connect()
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.use(bodyParser.json())
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// Serves up the main built application to the root
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.use(serveStatic(`${__dirname}/dist`))
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// During build, a custom page will be served before the app is available
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.use(serveStatic(`${__dirname}/public`, { index: 'default.html' }))
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// This root returns the status of a given service - used for uptime monitoring
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.use('/ping', (req, res) => {
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try {
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pingUrl(req.url, async (results) => {
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await res.end(results);
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});
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} catch (e) {
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printWarning(`Error running ping check for ${req.url}\n`, e);
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}
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})
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// POST Endpoint used to save config, by writing conf.yml to disk
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.use('/config-manager/save', method('POST', (req, res) => {
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try {
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saveConfig(req.body, (results) => {
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res.end(results);
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});
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} catch (e) {
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res.end(JSON.stringify({ success: false, message: e }));
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}
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}))
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// GET endpoint to trigger a build, and respond with success status and output
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.use('/config-manager/rebuild', (req, res) => {
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rebuild().then((response) => {
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res.end(JSON.stringify(response));
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}).catch((response) => {
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res.end(JSON.stringify(response));
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});
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})
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// Finally, initialize the server then print welcome message
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.listen(port, () => {
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try { printWelcomeMessage(); } catch (e) { printWarning('Dashy is Starting...'); }
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});
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} catch (error) {
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printWarning('Sorry, a critical error occurred ', error);
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}
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