hotweby
Version:
Automatic hot-reloading webserver using websockets
138 lines • 19.1 kB
JavaScript
import express from "express";
import * as afs from "fs/promises";
import * as path from "path";
import { WebSocket, WebSocketServer } from "ws";
export function createReloadHtmlCode() {
const reloadHtmlScript = async () => {
console.log("[HOTWEBY]: connect websocket...");
const connectWs = () => {
const wsUrl = (location.protocol === "https:"
? "wss://"
: "ws://") + location.host;
const ws = new WebSocket(wsUrl);
ws.onopen = () => console.log("[HOTWEBY]: websocket connected");
ws.onclose = () => {
console.log("[HOTWEBY]: websocket closed, reloading...");
setTimeout(() => location.reload(), 100);
};
ws.onerror = err => {
console.error("[HOTWEBY]: websocket error, reloading...", err);
setTimeout(() => location.reload(), 1000);
};
};
connectWs();
};
const reloadHtmlCode = "" + reloadHtmlScript;
return "<script>\n(" + reloadHtmlCode + ")()\n</script>";
}
export function createExpress(targetDir, reloadHtmlCode, autoExtensionResolution, verbose) {
const app = express();
app.use(async (req, res, next) => {
if (!req.path.endsWith(".html") &&
!req.path.endsWith("/")) {
return next();
}
let reqPath = req.path;
if (reqPath.endsWith("/")) {
reqPath += "index.html";
}
try {
const data = await afs.readFile(targetDir + reqPath, "utf8");
res.status(200);
res.send(reloadHtmlCode + "\n" + data.toString());
verbose &&
console.info("Served html-file '" +
req.path +
"' from '" +
targetDir +
reqPath +
"'");
}
catch (err) {
console.error("Cant read requested html-file '" +
req.path +
"'" +
"\nfrom '" +
targetDir +
reqPath +
"':\n", err);
res.status(503);
res.setHeader("Content-Type", "text/plain");
res.setHeader("Retry-After", "5");
res.send("Cant read requested html-file '" +
req.path +
"'");
}
});
autoExtensionResolution &&
app.use(async (req, res, next) => {
const resolvedExtension = await autoResolveExtensions(req.url, targetDir, verbose);
if (resolvedExtension) {
req.url = resolvedExtension;
}
next();
});
app.use(express.static(targetDir));
return app;
}
export async function autoResolveExtensions(reqUrl, targetDir, verbose) {
while (reqUrl.startsWith("/")) {
reqUrl = reqUrl.slice(1);
}
if (reqUrl === "") {
return undefined;
}
try {
let realPath = targetDir + "/" + reqUrl;
if ((await pathType(realPath)) === "none") {
const files = await afs.readdir(path.dirname(realPath));
const baseName = path.basename(realPath);
for (const file of files) {
if (file.startsWith(baseName + ".")) {
verbose &&
console.info("Auto resolved extension for '" +
reqUrl +
"' to be '" +
path.dirname(reqUrl) +
"/" +
file +
"'");
return path.dirname(reqUrl) + "/" + file;
}
}
}
}
catch (err) {
verbose &&
console.error("Error while auto resolving extension for " +
reqUrl +
"\n", err);
}
return undefined;
}
export async function pathType(path) {
try {
const stat = await afs.stat(path);
return stat.isFile() ? "file" : "dir";
}
catch { }
return "none";
}
export function createWebSocketServer(httpServer, registerTrigger) {
const wsServer = new WebSocketServer({ noServer: true });
wsServer.on("connection", (ws, req) => {
registerTrigger(() => {
if (ws.readyState === ws.OPEN ||
ws.readyState === ws.CONNECTING) {
ws.close();
}
});
});
httpServer.on("upgrade", (req, socket, head) => {
wsServer.handleUpgrade(req, socket, head, ws => {
wsServer.emit("connection", ws, req);
});
});
return wsServer;
}
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express from \"express\"\nimport * as afs from \"fs/promises\"\nimport { IncomingMessage, Server, ServerResponse } from \"http\"\nimport * as path from \"path\"\nimport { WebSocket, WebSocketServer } from \"ws\"\nimport { TriggerHandler } from \"./index.js\"\n\nexport function createReloadHtmlCode() {\n    const reloadHtmlScript = async () => {\n        console.log(\"[HOTWEBY]: connect websocket...\")\n\n        const connectWs = () => {\n            const wsUrl =\n                (location.protocol === \"https:\"\n                    ? \"wss://\"\n                    : \"ws://\") + location.host\n\n            const ws = new WebSocket(wsUrl)\n            ws.onopen = () =>\n                console.log(\"[HOTWEBY]: websocket connected\")\n            ws.onclose = () => {\n                console.log(\n                    \"[HOTWEBY]: websocket closed, reloading...\",\n                )\n                setTimeout(() => location.reload(), 100)\n            }\n            ws.onerror = err => {\n                console.error(\n                    \"[HOTWEBY]: websocket error, reloading...\",\n                    err,\n                )\n                setTimeout(() => location.reload(), 1000)\n            }\n        }\n\n        connectWs()\n    }\n\n    const reloadHtmlCode = \"\" + reloadHtmlScript\n\n    return \"<script>\\n(\" + reloadHtmlCode + \")()\\n</script>\"\n}\n\nexport function createExpress(\n    targetDir: string,\n    reloadHtmlCode: string,\n    autoExtensionResolution: boolean,\n    verbose: boolean,\n) {\n    const app = express()\n\n    app.use(async (req, res, next) => {\n        if (\n            !req.path.endsWith(\".html\") &&\n            !req.path.endsWith(\"/\")\n        ) {\n            return next()\n        }\n\n        let reqPath = req.path\n\n        if (reqPath.endsWith(\"/\")) {\n            reqPath += \"index.html\"\n        }\n\n        try {\n            const data = await afs.readFile(\n                targetDir + reqPath,\n                \"utf8\",\n            )\n            res.status(200)\n            res.send(reloadHtmlCode + \"\\n\" + data.toString())\n\n            verbose &&\n                console.info(\n                    \"Served html-file '\" +\n                        req.path +\n                        \"' from '\" +\n                        targetDir +\n                        reqPath +\n                        \"'\",\n                )\n        } catch (err) {\n            console.error(\n                \"Cant read requested html-file '\" +\n                    req.path +\n                    \"'\" +\n                    \"\\nfrom '\" +\n                    targetDir +\n                    reqPath +\n                    \"':\\n\",\n                err,\n            )\n            res.status(503)\n            res.setHeader(\"Content-Type\", \"text/plain\")\n            res.setHeader(\"Retry-After\", \"5\")\n            res.send(\n                \"Cant read requested html-file '\" +\n                    req.path +\n                    \"'\",\n            )\n        }\n    })\n\n    autoExtensionResolution &&\n        app.use(async (req, res, next) => {\n            const resolvedExtension =\n                await autoResolveExtensions(\n                    req.url,\n                    targetDir,\n                    verbose,\n                )\n\n            if (resolvedExtension) {\n                req.url = resolvedExtension\n            }\n\n            next()\n        })\n\n    app.use(express.static(targetDir))\n\n    return app\n}\n\nexport async function autoResolveExtensions(\n    reqUrl: string,\n    targetDir: string,\n    verbose: boolean,\n): Promise<string | undefined> {\n    while (reqUrl.startsWith(\"/\")) {\n        reqUrl = reqUrl.slice(1)\n    }\n\n    if (reqUrl === \"\") {\n        return undefined\n    }\n\n    try {\n        let realPath = targetDir + \"/\" + reqUrl\n        if ((await pathType(realPath)) === \"none\") {\n            const files = await afs.readdir(\n                path.dirname(realPath),\n            )\n\n            const baseName = path.basename(realPath)\n            for (const file of files) {\n                if (file.startsWith(baseName + \".\")) {\n                    verbose &&\n                        console.info(\n                            \"Auto resolved extension for '\" +\n                                reqUrl +\n                                \"' to be '\" +\n                                path.dirname(reqUrl) +\n                                \"/\" +\n                                file +\n                                \"'\",\n                        )\n                    return path.dirname(reqUrl) + \"/\" + file\n                }\n            }\n        }\n    } catch (err) {\n        verbose &&\n            console.error(\n                \"Error while auto resolving extension for \" +\n                    reqUrl +\n                    \"\\n\",\n                err,\n            )\n    }\n\n    return undefined\n}\n\nexport async function pathType(\n    path: string,\n): Promise<\"file\" | \"dir\" | \"none\"> {\n    try {\n        const stat = await afs.stat(path)\n        return stat.isFile() ? \"file\" : \"dir\"\n    } catch {}\n    return \"none\"\n}\n\nexport function createWebSocketServer(\n    httpServer: Server<\n        typeof IncomingMessage,\n        typeof ServerResponse\n    >,\n    registerTrigger: (triggerHandler: TriggerHandler) => void,\n) {\n    const wsServer = new WebSocketServer({ noServer: true })\n    wsServer.on(\"connection\", (ws, req) => {\n        registerTrigger(() => {\n            if (\n                ws.readyState === ws.OPEN ||\n                ws.readyState === ws.CONNECTING\n            ) {\n                ws.close()\n            }\n        })\n    })\n\n    httpServer.on(\"upgrade\", (req, socket, head) => {\n        wsServer.handleUpgrade(req, socket, head, ws => {\n            wsServer.emit(\"connection\", ws, req)\n        })\n    })\n\n    return wsServer\n}\n"]}