deepak1556 · March 21, 2025 16:46 · deepak1556 · Mar 21, 2025 · deepak1556 · Mar 21, 2025
diff --git a/child.js b/child.js
 console.log('worker sub resource');
diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <html>
  <head>
    <meta charset="UTF-8">
    <title>Hello World!</title>
  </head>
  <body>
    <h1>Hello World!</h1>
    We are using Node.js <span id="node-version"></span>,
    Chromium <span id="chrome-version"></span>,
    and Electron <span id="electron-version"></span>.

    <!-- You can also require other files to run in this process -->
    <script src="renderer.js"></script>
  </body>
 </html>
diff --git a/main.js b/main.js
 // Modules to control application life and create native browser window
 const { app, BrowserWindow, protocol } = require('electron')
 const path = require('node:path')

 protocol.registerSchemesAsPrivileged([
  {
    scheme: 'app',
    privileges: {
      standard: true,
      secure: true,
      allowServiceWorkers: true,
      supportFetchAPI: true
    }
  }
 ])

 function createWindow () {
  // Create the browser window.
  const mainWindow = new BrowserWindow({
    width: 800,
    height: 600,
    webPreferences: {
      sandbox: true
    }
  })

  mainWindow.webContents.session.protocol.registerFileProtocol('app', (request, cb) => {
    const resource = request.url.slice('app://host/'.length)
    cb({ path: path.join(__dirname, resource)});
  })

  // and load the index.html of the app.
  mainWindow.loadURL('app://host/index.html')

  // Open the DevTools.
  // mainWindow.webContents.openDevTools()
 }

 // This method will be called when Electron has finished
 // initialization and is ready to create browser windows.
 // Some APIs can only be used after this event occurs.
 app.whenReady().then(() => {
  createWindow()

  app.on('activate', function () {
    // On macOS it's common to re-create a window in the app when the
    // dock icon is clicked and there are no other windows open.
    if (BrowserWindow.getAllWindows().length === 0) createWindow()
  })
 })

 // Quit when all windows are closed, except on macOS. There, it's common
 // for applications and their menu bar to stay active until the user quits
 // explicitly with Cmd + Q.
 app.on('window-all-closed', function () {
  if (process.platform !== 'darwin') app.quit()
 })

 // In this file you can include the rest of your app's specific main process
 // code. You can also put them in separate files and require them here.
diff --git a/renderer.js b/renderer.js
 var registration;
 navigator.serviceWorker.register('sw.js')
    .catch(function() {
        console.error('register should not fail');
    })

    navigator.serviceWorker.addEventListener('controllerchange', () => {
        console.log('Starting window fetch..')
    fetch('clientId')
    .then(function(response) {
        return response.text();
    })
    .then(function(text) {
        console.log(`Fetch from window ${text}`);
        console.log('Starting dedicated worker...');
        var w = new Worker('worker.js');
        w.postMessage({cmd:'GetClientId'});
        return new Promise((resolve) => {
            w.onmessage = e => resolve(e.data);
        });
    })
    .then(function(data) {
        console.log(`Fetch from worker ${data.result}`);
        console.log('Starting dedicated blob worker...');
        const fetchURL = new URL('clientId', window.location).href;
        const workerScript =
    `self.onmessage = async (e) => {
        if (e.data.cmd == 'GetClientId') {
            const response = await fetch(e.data.url);
            const text = await response.text();
            self.postMessage({"result": text});
        }
    };`;
        const blob = new Blob([workerScript], { type: 'text/javascript' });
        const blobUrl = URL.createObjectURL(blob);
        var w = new Worker(blobUrl);
        w.postMessage({cmd:'GetClientId', url: fetchURL});
        return new Promise((resolve) => {
            w.onmessage = e => resolve(e.data);
        });
    })
    .then(function(data) {
        console.log(`Fetch from blob worker ${data.result}`);
    });
 });
diff --git a/sw.js b/sw.js
 self.onfetch = async function(e) {
  console.log(`Fetch clientID: ${e.clientId} for url : ${e.request.url}`);
  if (/\/clientId$/.test(e.request.url)) {
    return e.respondWith(processRequest(e));
  }
 };

 async function processRequest(e) {
    const client = await self.clients.get(e.clientId);
  if (!client) {
      const workerClients = await self.clients.matchAll({type: 'worker'});
      const filteredClients = workerClients.filter(workerClient => {
          return workerClient.id === e.clientId;
      });
      if (filteredClients.length != 1) {
        return new Response('Not Found', { status: 404, });
      }
      return new Response(`Found blob worker client : ${filteredClients[0].url}`, { status: 200, });
  }
  return new Response('Found', { status: 200, });
 }

 self.oninstall = function(e) {
 	e.waitUntil(self.skipWaiting()); // Activate worker immediately
 };

 self.onactivate = function(e) {
 	e.waitUntil(self.clients.claim()); // Become available to all pages
 };
diff --git a/worker.js b/worker.js
 importScripts('child.js');

 onmessage = function(e) {
  if (e.data.cmd == 'GetClientId') {
    fetch('clientId')
        .then(function(response) {
          return response.text();
        })
        .then(function(text) {
          self.postMessage({"result": text});
        });
  }
 };
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="UTF-8">
	<title>Hello World!</title>
	</head>
	<body>
	<h1>Hello World!</h1>
	We are using Node.js <span id="node-version"></span>,
	Chromium <span id="chrome-version"></span>,
	and Electron <span id="electron-version"></span>.

	<!-- You can also require other files to run in this process -->
	<script src="renderer.js"></script>
	</body>
	</html>
	// Modules to control application life and create native browser window
	const { app, BrowserWindow, protocol } = require('electron')
	const path = require('node:path')

	protocol.registerSchemesAsPrivileged([
	{
	scheme: 'app',
	privileges: {
	standard: true,
	secure: true,
	allowServiceWorkers: true,
	supportFetchAPI: true
	}
	}
	])

	function createWindow () {
	// Create the browser window.
	const mainWindow = new BrowserWindow({
	width: 800,
	height: 600,
	webPreferences: {
	sandbox: true
	}
	})

	mainWindow.webContents.session.protocol.registerFileProtocol('app', (request, cb) => {
	const resource = request.url.slice('app://host/'.length)
	cb({ path: path.join(__dirname, resource)});
	})

	// and load the index.html of the app.
	mainWindow.loadURL('app://host/index.html')

	// Open the DevTools.
	// mainWindow.webContents.openDevTools()
	}

	// This method will be called when Electron has finished
	// initialization and is ready to create browser windows.
	// Some APIs can only be used after this event occurs.
	app.whenReady().then(() => {
	createWindow()

	app.on('activate', function () {
	// On macOS it's common to re-create a window in the app when the
	// dock icon is clicked and there are no other windows open.
	if (BrowserWindow.getAllWindows().length === 0) createWindow()
	})
	})

	// Quit when all windows are closed, except on macOS. There, it's common
	// for applications and their menu bar to stay active until the user quits
	// explicitly with Cmd + Q.
	app.on('window-all-closed', function () {
	if (process.platform !== 'darwin') app.quit()
	})

	// In this file you can include the rest of your app's specific main process
	// code. You can also put them in separate files and require them here.
	var registration;
	navigator.serviceWorker.register('sw.js')
	.catch(function() {
	console.error('register should not fail');
	})

	navigator.serviceWorker.addEventListener('controllerchange', () => {
	console.log('Starting window fetch..')
	fetch('clientId')
	.then(function(response) {
	return response.text();
	})
	.then(function(text) {
	console.log(`Fetch from window ${text}`);
	console.log('Starting dedicated worker...');
	var w = new Worker('worker.js');
	w.postMessage({cmd:'GetClientId'});
	return new Promise((resolve) => {
	w.onmessage = e => resolve(e.data);
	});
	})
	.then(function(data) {
	console.log(`Fetch from worker ${data.result}`);
	console.log('Starting dedicated blob worker...');
	const fetchURL = new URL('clientId', window.location).href;
	const workerScript =
	`self.onmessage = async (e) => {
	if (e.data.cmd == 'GetClientId') {
	const response = await fetch(e.data.url);
	const text = await response.text();
	self.postMessage({"result": text});
	}
	};`;
	const blob = new Blob([workerScript], { type: 'text/javascript' });
	const blobUrl = URL.createObjectURL(blob);
	var w = new Worker(blobUrl);
	w.postMessage({cmd:'GetClientId', url: fetchURL});
	return new Promise((resolve) => {
	w.onmessage = e => resolve(e.data);
	});
	})
	.then(function(data) {
	console.log(`Fetch from blob worker ${data.result}`);
	});
	});
	self.onfetch = async function(e) {
	console.log(`Fetch clientID: ${e.clientId} for url : ${e.request.url}`);
	if (/\/clientId$/.test(e.request.url)) {
	return e.respondWith(processRequest(e));
	}
	};

	async function processRequest(e) {
	const client = await self.clients.get(e.clientId);
	if (!client) {
	const workerClients = await self.clients.matchAll({type: 'worker'});
	const filteredClients = workerClients.filter(workerClient => {
	return workerClient.id === e.clientId;
	});
	if (filteredClients.length != 1) {
	return new Response('Not Found', { status: 404, });
	}
	return new Response(`Found blob worker client : ${filteredClients[0].url}`, { status: 200, });
	}
	return new Response('Found', { status: 200, });
	}

	self.oninstall = function(e) {
	e.waitUntil(self.skipWaiting()); // Activate worker immediately
	};

	self.onactivate = function(e) {
	e.waitUntil(self.clients.claim()); // Become available to all pages
	};
	importScripts('child.js');

	onmessage = function(e) {
	if (e.data.cmd == 'GetClientId') {
	fetch('clientId')
	.then(function(response) {
	return response.text();
	})
	.then(function(text) {
	self.postMessage({"result": text});
	});
	}
	};