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app_vue/node_modules/webpack/lib/hmr/lazyCompilationBackend.js

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+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+	Author Tobias Koppers @sokra
+*/
+
+"use strict";
+
+/** @typedef {import("http").IncomingMessage} IncomingMessage */
+/** @typedef {import("http").RequestListener} RequestListener */
+/** @typedef {import("http").ServerOptions} HttpServerOptions */
+/** @typedef {import("http").ServerResponse} ServerResponse */
+/** @typedef {import("https").ServerOptions} HttpsServerOptions */
+/** @typedef {import("net").AddressInfo} AddressInfo */
+/** @typedef {import("net").Server} Server */
+/** @typedef {import("../../declarations/WebpackOptions").LazyCompilationDefaultBackendOptions} LazyCompilationDefaultBackendOptions */
+/** @typedef {import("../Compiler")} Compiler */
+/** @typedef {import("../Module")} Module */
+/** @typedef {import("./LazyCompilationPlugin").BackendApi} BackendApi */
+/** @typedef {import("./LazyCompilationPlugin").BackendHandler} BackendHandler */
+
+/**
+ * @param {Omit<LazyCompilationDefaultBackendOptions, "client"> & { client: NonNullable<LazyCompilationDefaultBackendOptions["client"]>}} options additional options for the backend
+ * @returns {BackendHandler} backend
+ */
+module.exports = options => (compiler, callback) => {
+	const logger = compiler.getInfrastructureLogger("LazyCompilationBackend");
+	const activeModules = new Map();
+	const prefix = "/lazy-compilation-using-";
+
+	const isHttps =
+		options.protocol === "https" ||
+		(typeof options.server === "object" &&
+			("key" in options.server || "pfx" in options.server));
+
+	const createServer =
+		typeof options.server === "function"
+			? options.server
+			: (() => {
+					const http = isHttps ? require("https") : require("http");
+					return http.createServer.bind(
+						http,
+						/** @type {HttpServerOptions | HttpsServerOptions} */
+						(options.server)
+					);
+				})();
+	/** @type {(server: Server) => void} */
+	const listen =
+		typeof options.listen === "function"
+			? options.listen
+			: server => {
+					let listen = options.listen;
+					if (typeof listen === "object" && !("port" in listen))
+						listen = { ...listen, port: undefined };
+					server.listen(listen);
+				};
+
+	const protocol = options.protocol || (isHttps ? "https" : "http");
+
+	/** @type {RequestListener} */
+	const requestListener = (req, res) => {
+		if (req.url === undefined) return;
+		const keys = req.url.slice(prefix.length).split("@");
+		req.socket.on("close", () => {
+			setTimeout(() => {
+				for (const key of keys) {
+					const oldValue = activeModules.get(key) || 0;
+					activeModules.set(key, oldValue - 1);
+					if (oldValue === 1) {
+						logger.log(
+							`${key} is no longer in use. Next compilation will skip this module.`
+						);
+					}
+				}
+			}, 120000);
+		});
+		req.socket.setNoDelay(true);
+		res.writeHead(200, {
+			"content-type": "text/event-stream",
+			"Access-Control-Allow-Origin": "*",
+			"Access-Control-Allow-Methods": "*",
+			"Access-Control-Allow-Headers": "*"
+		});
+		res.write("\n");
+		let moduleActivated = false;
+		for (const key of keys) {
+			const oldValue = activeModules.get(key) || 0;
+			activeModules.set(key, oldValue + 1);
+			if (oldValue === 0) {
+				logger.log(`${key} is now in use and will be compiled.`);
+				moduleActivated = true;
+			}
+		}
+		if (moduleActivated && compiler.watching) compiler.watching.invalidate();
+	};
+
+	const server = /** @type {Server} */ (createServer());
+	server.on("request", requestListener);
+
+	let isClosing = false;
+	/** @type {Set<import("net").Socket>} */
+	const sockets = new Set();
+	server.on("connection", socket => {
+		sockets.add(socket);
+		socket.on("close", () => {
+			sockets.delete(socket);
+		});
+		if (isClosing) socket.destroy();
+	});
+	server.on("clientError", e => {
+		if (e.message !== "Server is disposing") logger.warn(e);
+	});
+
+	server.on(
+		"listening",
+		/**
+		 * @param {Error} err error
+		 * @returns {void}
+		 */
+		err => {
+			if (err) return callback(err);
+			const _addr = server.address();
+			if (typeof _addr === "string")
+				throw new Error("addr must not be a string");
+			const addr = /** @type {AddressInfo} */ (_addr);
+			const urlBase =
+				addr.address === "::" || addr.address === "0.0.0.0"
+					? `${protocol}://localhost:${addr.port}`
+					: addr.family === "IPv6"
+						? `${protocol}://[${addr.address}]:${addr.port}`
+						: `${protocol}://${addr.address}:${addr.port}`;
+			logger.log(
+				`Server-Sent-Events server for lazy compilation open at ${urlBase}.`
+			);
+			callback(null, {
+				dispose(callback) {
+					isClosing = true;
+					// Removing the listener is a workaround for a memory leak in node.js
+					server.off("request", requestListener);
+					server.close(err => {
+						callback(err);
+					});
+					for (const socket of sockets) {
+						socket.destroy(new Error("Server is disposing"));
+					}
+				},
+				module(originalModule) {
+					const key = `${encodeURIComponent(
+						originalModule.identifier().replace(/\\/g, "/").replace(/@/g, "_")
+					).replace(/%(2F|3A|24|26|2B|2C|3B|3D)/g, decodeURIComponent)}`;
+					const active = activeModules.get(key) > 0;
+					return {
+						client: `${options.client}?${encodeURIComponent(urlBase + prefix)}`,
+						data: key,
+						active
+					};
+				}
+			});
+		}
+	);
+	listen(server);
+};