Created
December 9, 2023 17:14
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Live reload server for static folder
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import http from 'node:http'; | |
import fs from 'node:fs'; | |
import path from 'node:path'; | |
import { WebSocketServer } from 'ws'; | |
const connections = new Map(); | |
let currentConnectionNumber = 0 | |
const staticFolder = './dist' | |
const MIME_TYPES = { | |
html: 'text/html; charset=UTF-8', | |
json: 'application/json; charset=UTF-8', | |
js: 'application/javascript; charset=UTF-8', | |
css: 'text/css', | |
png: 'image/png', | |
ico: 'image/x-icon', | |
svg: 'image/svg+xml', | |
}; | |
const HEADERS = { | |
'X-XSS-Protection': '1; mode=block', | |
'X-Content-Type-Options': 'nosniff', | |
'Strict-Transport-Security': 'max-age=31536000; includeSubdomains; preload', | |
'Access-Control-Allow-Origin': '*', | |
'Access-Control-Allow-Methods': 'POST, GET, OPTIONS', | |
'Access-Control-Allow-Headers': 'Content-Type', | |
}; | |
const serveStatic = (staticPath) => async (req, res) => { | |
const url = req.url === '/' ? '/index.html' : req.url; | |
const filePath = path.join(staticPath, url); | |
try { | |
let data = await fs.promises.readFile(filePath); | |
const fileExt = path.extname(filePath).substring(1); | |
const mimeType = MIME_TYPES[fileExt] || MIME_TYPES.html; | |
if (fileExt === 'html') { | |
data = `${data} | |
<script> | |
let ws = new WebSocket('ws://' + window.location.host + '/path'); | |
console.log('Live reload server connected'); | |
ws.onmessage = (event) => { | |
if (event.data === 'reload') window.location.reload(); | |
}; | |
</script>` | |
} | |
res.writeHead(200, { ...HEADERS, 'Content-Type': mimeType }); | |
res.end(data); | |
} catch (err) { | |
res.statusCode = 404; | |
res.end('"File is not found"'); | |
} | |
}; | |
class Watcher { | |
constructor(connection) { | |
this.connection = connection; | |
this.connectionNumber = currentConnectionNumber++; | |
connections.set(this.connectionNumber, connection); | |
} | |
destroy() { | |
connections.delete(this.connectionNumber); | |
} | |
} | |
const watch = (path) => { | |
fs.watch(path, (event, file) => { | |
console.log(file) | |
connections.forEach(connection => { | |
connection.send('reload'); | |
}) | |
}); | |
}; | |
class Server { | |
constructor() { | |
const staticPath = path.join('.', staticFolder); | |
this.staticHandler = serveStatic(staticPath); | |
this.httpServer = http.createServer(); | |
const port = 4000; | |
this.listen(port); | |
console.log(`API on port ${port}`); | |
} | |
listen(port) { | |
this.httpServer.on('request', async (req, res) => { | |
this.staticHandler(req, res); | |
}); | |
const wsServer = new WebSocketServer({ server: this.httpServer }); | |
wsServer.on('connection', (connection, req) => { | |
const watcherConnection = new Watcher(connection) | |
connection.on('message', (data) => { | |
connection.send('reply') | |
}); | |
connection.on('close', () => { | |
watcherConnection.destroy() | |
}); | |
}); | |
this.httpServer.listen(port); | |
} | |
} | |
watch(staticFolder); | |
new Server(); |
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