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devServer.js
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devServer.js
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/* eslint-disable no-console,global-require,no-underscore-dangle */
const path = require('path');
const notifier = require('node-notifier');
const chokidar = require('chokidar');
const webpack = require('webpack');
const express = require('express');
const createWebpackMiddleware = require('webpack-dev-middleware');
const createWebpackHotMiddleware = require('webpack-hot-middleware');
function createNotification(options = {}) {
// disable for now
return
const title = !!options.title
? `π₯ ${options.title.toUpperCase()}`
: undefined;
notifier.notify({
title,
message: options.message,
open: options.open,
});
console.log(`==> ${title} -> ${options.message}`);
}
class ListenerManager {
constructor(listener) {
this.lastConnectionKey = 0;
this.connectionMap = {};
this.listener = listener;
// Track all connections to our server so that we can close them when needed.
this.listener.on('connection', connection => {
// Generate a new key to represent the connection
const connectionKey = ++this.lastConnectionKey;
// Add the connection to our map.
this.connectionMap[connectionKey] = connection;
// Remove the connection from our map when it closes.
connection.on('close', () => {
delete this.connectionMap[connectionKey];
});
});
}
dispose() {
return new Promise(resolve => {
// First we destroy any connections.
Object.keys(this.connectionMap).forEach((connectionKey) => {
this.connectionMap[connectionKey].destroy();
});
// Then we close the listener.
if (this.listener) {
this.listener.close(() => {
resolve();
});
} else {
resolve();
}
});
}
}
class HotServer {
constructor(compiler) {
this.compiler = compiler;
this.listenerManager = null;
const compiledOutputPath = path.resolve(
compiler.options.output.path, `${Object.keys(compiler.options.entry)[0]}.js`
);
try {
// The server bundle will automatically start the web server just by
// requiring it. It returns the http listener too.
this.listenerManager = new ListenerManager(require(compiledOutputPath).default);
const url = `http://localhost:${process.env.SERVER_PORT}`;
createNotification({
title: 'server',
message: `π Running on ${url}`,
open: url,
});
} catch (err) {
createNotification({
title: 'server',
message: 'π΅ Bundle invalid, check console for error',
});
console.log(err);
}
}
dispose() {
return Promise.all([
this.listenerManager ? this.listenerManager.dispose() : undefined,
]);
}
}
class HotClient {
constructor(compiler) {
const app = express();
this.webpackDevMiddleware = createWebpackMiddleware(compiler, {
quiet: true,
noInfo: true,
headers: {
'Access-Control-Allow-Origin': '*',
},
// The path at which the client bundles are served from. Note: in this
// case as we are running a seperate dev server the public path should
// be absolute, i.e. including the "http://..."
publicPath: compiler.options.output.publicPath,
});
app.use(this.webpackDevMiddleware);
app.use(createWebpackHotMiddleware(compiler));
const listener = app.listen(process.env.CLIENT_DEVSERVER_PORT);
this.listenerManager = new ListenerManager(listener);
createNotification({
title: 'client',
message: 'β
Running',
});
}
dispose() {
this.webpackDevMiddleware.close();
return Promise.all([
this.listenerManager ? this.listenerManager.dispose() : undefined,
]);
}
}
class HotServers {
constructor() {
// Bind our functions to avoid any scope/closure issues.
this.start = this.start.bind(this);
this.restart = this.restart.bind(this);
this._configureHotClient = this._configureHotClient.bind(this);
this._configureHotServer = this._configureHotServer.bind(this);
this.clientBundle = null;
this.clientCompiler = null;
this.serverBundle = null;
this.serverCompiler = null;
}
start() {
try {
const clientConfig = require('./webpack.client.config')({ mode: 'development' });
this.clientCompiler = webpack(clientConfig);
const serverConfig = require('./webpack.server.config')({ mode: 'development' });
this.serverCompiler = webpack(serverConfig);
} catch (err) {
createNotification({
title: 'webpack',
message: 'π΅ Webpack config invalid, check console for error',
});
console.log(err);
return;
}
this._configureHotClient();
this._configureHotServer();
}
restart() {
const clearWebpackConfigsCache = () => {
Object.keys(require.cache).forEach(modulePath => {
if (~modulePath.indexOf('webpack')) {
delete require.cache[modulePath];
}
});
};
Promise.all([
this.serverBundle ? this.serverBundle.dispose() : undefined,
this.clientBundle ? this.clientBundle.dispose() : undefined,
]).then(clearWebpackConfigsCache).then(this.start, err => console.log(err));
}
_configureHotClient() {
this.clientCompiler.plugin('done', (stats) => {
if (stats.hasErrors()) {
createNotification({
title: 'client',
message: 'π΅ Build failed, check console for error',
});
console.log(stats.toString());
} else {
createNotification({
title: 'client',
message: 'β
Built',
});
}
});
this.clientBundle = new HotClient(this.clientCompiler);
}
_configureHotServer() {
const compileHotServer = () => {
const runCompiler = () => this.serverCompiler.run(() => undefined);
// Shut down any existing running server if necessary before starting the
// compile, else just compile.
if (this.serverBundle) {
this.serverBundle.dispose().then(runCompiler);
} else {
runCompiler();
}
};
this.clientCompiler.plugin('done', (stats) => {
if (!stats.hasErrors()) {
compileHotServer();
}
});
this.serverCompiler.plugin('done', (stats) => {
if (stats.hasErrors()) {
createNotification({
title: 'server',
message: 'π΅ Build failed, check console for error',
});
console.log(stats.toString());
return;
}
createNotification({
title: 'server',
message: 'β
Built',
});
// Make sure our newly built server bundles aren't in the module cache.
Object.keys(require.cache).forEach(modulePath => {
if (~modulePath.indexOf(this.serverCompiler.options.output.path)) {
delete require.cache[modulePath];
}
});
this.serverBundle = new HotServer(this.serverCompiler);
});
// Now we will configure `chokidar` to watch our server specific source folder.
// Any changes will cause a rebuild of the server bundle.
this.watcher = chokidar.watch([path.resolve(__dirname, './src/server')]);
this.watcher.on('ready', () => {
this.watcher
.on('add', compileHotServer)
.on('addDir', compileHotServer)
.on('change', compileHotServer)
.on('unlink', compileHotServer)
.on('unlinkDir', compileHotServer);
});
}
}
const hotServers = new HotServers();
// Any changes to our webpack config builder will cause us to restart our
// hot servers.
const watcher = chokidar.watch(
path.resolve(__dirname, './webpackConfigFactory.js')
);
watcher.on('ready', () => {
watcher.on('change', hotServers.restart);
});
hotServers.start();