server.js

const fs = require("fs");
const path = require("path");
const _ = require("lodash");
const http = require("http");
const socketIO = require("socket.io");
const express = require("express");
const favicon = require("serve-favicon");
const compression = require("compression");
const cookieParser = require("cookie-parser");
const bodyParser = require("body-parser");
const cors = require("cors");
const helmet = require("helmet");
const morgan = require("morgan");
const microcache = require("route-cache");
const resolve = file => path.resolve(__dirname, file);
const { createBundleRenderer } = require("vue-server-renderer");
const logger = require("./server/features/logger");
const isProd = process.env.NODE_ENV === "production";
const isDev = !isProd;
const ngrok = process.env.ENABLE_TUNNEL ? require("ngrok") : false;
const useMicroCache = process.env.MICRO_CACHE !== "false";
const serverInfo =
  `express/${require("express/package.json").version} ` +
  `vue-server-renderer/${require("vue-server-renderer/package.json").version}`;

global.appConfig = _.merge(
  {},
  require("./server/config.json"),
  require("./server/config.prod.json"),
  { isDev, isProd }
);
global.errorHandler = require("./server/features/core").errorHandler;

const app = express();
const db = require("./server/db/models");
const server = http.createServer(app);
const io = socketIO(server);

function createRenderer(bundle, options) {
  // https://github.com/vuejs/vue/blob/dev/packages/vue-server-renderer/README.md#why-use-bundlerenderer
  return createBundleRenderer(
    bundle,
    Object.assign(options, {
      // this is only needed when vue-server-renderer is npm-linked
      basedir: resolve("./dist"),
      // recommended for performance
      runInNewContext: false
    })
  );
}

let renderer;
let readyPromise;
const templatePath = resolve("./src/index.template.html");
if (isProd) {
  // In production: create server renderer using template and built server bundle.
  // The server bundle is generated by vue-ssr-webpack-plugin.
  const template = fs.readFileSync(templatePath, "utf-8");
  const bundle = require("./dist/vue-ssr-server-bundle.json");
  // The client manifests are optional, but it allows the renderer
  // to automatically infer preload/prefetch links and directly add <script>
  // tags for any async chunks used during render, avoiding waterfall requests.
  const clientManifest = require("./dist/vue-ssr-client-manifest.json");
  renderer = createRenderer(bundle, {
    template,
    clientManifest
  });
} else {
  // In development: setup the dev server with watch and hot-reload,
  // and create a new renderer on bundle / index template update.
  readyPromise = require("./build/setup-dev-server")(
    app,
    templatePath,
    (bundle, options) => {
      renderer = createRenderer(bundle, options);
    }
  );
}

const serve = (path, cache) =>
  express.static(resolve(path), {
    maxAge: cache && isProd ? 1000 * 60 * 60 * 24 * 30 : 0
  });

app.use(cors());
app.use(helmet());
app.use(bodyParser.json()); // handle json data
app.use(bodyParser.urlencoded({ extended: true })); // handle URL-encoded data
app.use(compression({ threshold: 0 }));
app.use(cookieParser());
app.use(favicon("./public/images/favicon.ico"));
app.use("/dist", serve("./dist", true));
app.use("/public", serve("./public", true));
app.use("/manifest.json", serve("./manifest.json", true));
app.use("/service-worker.js", serve("./dist/service-worker.js"));
app.disable("x-powered-by");
app.use(morgan("dev"));
// since this app has no user-specific content, every page is micro-cacheable.
// if your app involves user-specific content, you need to implement custom
// logic to determine whether a request is cacheable based on its url and
// headers.
// 1-second microcache.
// https://www.nginx.com/blog/benefits-of-microcaching-nginx/
app.use(microcache.cacheSeconds(1, req => useMicroCache && req.originalUrl));

require("./server/index")(app);
async function render(req, res) {
  const s = Date.now();

  res.setHeader("Content-Type", "text/html");
  res.setHeader("Server", serverInfo);

  const handleError = err => {
    if (err.url) {
      res.redirect(err.url);
    } else if (err.code === 404) {
      res.status(404).send("404 | Page Not Found");
    } else {
      // Render Error Page or Redirect
      res.status(500).send("500 | Internal Server Error");
      console.error(`error during render : ${req.url}`);
      console.error(err.stack);
    }
  };

  const uc = require("./server/features/app/app.controller");
  let appData = await uc.content(req);

  if (req.query.access_token) {
    appData = _.extend(appData, { access_token: req.query.access_token });
  }

  const context = {
    title: appData.content.app_title, // default title
    url: req.url,
    appData
  };
  renderer.renderToString(context, (err, html) => {
    if (err) {
      return handleError(err);
    }
    html = html.replace(
      '<div id="preloadedstate"></div>',
      `<script>window.__PRELOADEDSTATE__ = ${JSON.stringify(appData).replace(
        /</g,
        "\\u003c"
      )}</script>`
    );
    res.send(html);
    if (!isProd) {
      console.log(`whole request: ${Date.now() - s}ms`);
    }
  });
}

app.get(
  "*",
  isProd
    ? render
    : (req, res) => {
        readyPromise.then(() => render(req, res));
      }
);

const port = process.env.PORT || 5050;
// get the intended host and port number, use localhost and port 3000 if not provided
const customHost = process.env.HOST;
const host = customHost || null; // Let http.Server use its default IPv6/4 host
const prettyHost = customHost || "localhost";

// Start your app.
server.listen(port, host, err => {
  if (err) {
    return logger.error(err.message);
  }

  // Connect to ngrok in dev mode
  if (ngrok) {
    ngrok.connect(port, (innerErr, url) => {
      if (innerErr) {
        return logger.error(innerErr);
      }
      return logger.appStarted(port, prettyHost, url);
    });
  } else {
    return logger.appStarted(port, prettyHost);
  }
  return logger.appStarted(port, prettyHost);
});