timfish · November 3, 2021 00:29
diff --git a/index.html b/index.html
 <!DOCTYPE html>
 <html>
  <head>
    <meta charset="UTF-8">
    <!-- https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP -->
    <meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self'">
    <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, session } = require('electron')
 const path = require('path')
 const { Readable } = require('stream');

 protocol.registerSchemesAsPrivileged([{
  scheme: 'testing',
  privileges: { bypassCSP: true, supportFetchAPI: true }
 }]);

 function registerProtocol() {
  session.defaultSession.protocol.registerStreamProtocol('testing', (request, callback) => {
    const stream = new Readable({
      read(size) { },
    });

    setInterval(() => {
      stream.push(JSON.stringify(app.getAppMetrics()) + '\n')
    }, 5000);

    callback({
      statusCode: 200,
      data: stream
    })
  });
 }

 function createWindow() {
  const mainWindow = new BrowserWindow({
    width: 800,
    height: 600,
    webPreferences: {
      preload: path.join(__dirname, 'preload.js')
    }
  })

  mainWindow.loadFile('index.html')
  mainWindow.webContents.openDevTools({ mode: 'detach' })
 }

 app.whenReady().then(() => {
  registerProtocol()
  createWindow()
 })

 app.on('window-all-closed', function () {
  if (process.platform !== 'darwin') app.quit()
 })
diff --git a/package.json b/package.json
 {
  "name": "unhappy-market-cause-hoqc7",
  "productName": "unhappy-market-cause-hoqc7",
  "description": "My Electron application description",
  "keywords": [],
  "main": "./main.js",
  "version": "1.0.0",
  "author": "tim",
  "scripts": {
    "start": "electron ."
  },
  "dependencies": {},
  "devDependencies": {
    "electron": "15.3.0"
  }
 }
diff --git a/preload.js b/preload.js
 // All of the Node.js APIs are available in the preload process.
 // It has the same sandbox as a Chrome extension.
 window.addEventListener('DOMContentLoaded', () => {
  const replaceText = (selector, text) => {
    const element = document.getElementById(selector)
    if (element) element.innerText = text
  }

  for (const type of ['chrome', 'node', 'electron']) {
    replaceText(`${type}-version`, process.versions[type])
  }
 })
diff --git a/renderer.js b/renderer.js
 // copied from can-ndjson-stream

 var ndjsonStream = function (response) {
    // For cancellation
    var is_reader, cancellationRequest = false;
    return new ReadableStream({
        start: function (controller) {
            var reader = response.getReader();
            is_reader = reader;
            var decoder = new TextDecoder();
            var data_buf = "";

            reader.read().then(function processResult(result) {
                if (result.done) {
                    if (cancellationRequest) {
                        // Immediately exit
                        return;
                    }

                    data_buf = data_buf.trim();
                    if (data_buf.length !== 0) {
                        try {
                            var data_l = JSON.parse(data_buf);
                            controller.enqueue(data_l);
                        } catch (e) {
                            controller.error(e);
                            return;
                        }
                    }
                    controller.close();
                    return;
                }

                var data = decoder.decode(result.value, { stream: true });
                data_buf += data;
                var lines = data_buf.split("\n");
                for (var i = 0; i < lines.length - 1; ++i) {
                    var l = lines[i].trim();
                    if (l.length > 0) {
                        try {
                            var data_line = JSON.parse(l);
                            controller.enqueue(data_line);
                        } catch (e) {
                            controller.error(e);
                            cancellationRequest = true;
                            reader.cancel();
                            return;
                        }
                    }
                }
                data_buf = lines[lines.length - 1];

                return reader.read().then(processResult);
            });

        },
        cancel: function (reason) {
            console.log("Cancel registered due to ", reason);
            cancellationRequest = true;
            is_reader.cancel();
        }
    });
 };

 fetch('testing://stream').then((response) => {
    return ndjsonStream(response.body)
 }).then(async (exampleStream) => {
    const reader = exampleStream.getReader()

    while (true) {
        const value = await reader.read();
        console.log(value.value)
    }
 })
diff --git a/styles.css b/styles.css
 /* Empty */
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="UTF-8">
	<!-- https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP -->
	<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self'">
	<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, session } = require('electron')
	const path = require('path')
	const { Readable } = require('stream');

	protocol.registerSchemesAsPrivileged([{
	scheme: 'testing',
	privileges: { bypassCSP: true, supportFetchAPI: true }
	}]);

	function registerProtocol() {
	session.defaultSession.protocol.registerStreamProtocol('testing', (request, callback) => {
	const stream = new Readable({
	read(size) { },
	});

	setInterval(() => {
	stream.push(JSON.stringify(app.getAppMetrics()) + '\n')
	}, 5000);

	callback({
	statusCode: 200,
	data: stream
	})
	});
	}

	function createWindow() {
	const mainWindow = new BrowserWindow({
	width: 800,
	height: 600,
	webPreferences: {
	preload: path.join(__dirname, 'preload.js')
	}
	})

	mainWindow.loadFile('index.html')
	mainWindow.webContents.openDevTools({ mode: 'detach' })
	}

	app.whenReady().then(() => {
	registerProtocol()
	createWindow()
	})

	app.on('window-all-closed', function () {
	if (process.platform !== 'darwin') app.quit()
	})
	{
	"name": "unhappy-market-cause-hoqc7",
	"productName": "unhappy-market-cause-hoqc7",
	"description": "My Electron application description",
	"keywords": [],
	"main": "./main.js",
	"version": "1.0.0",
	"author": "tim",
	"scripts": {
	"start": "electron ."
	},
	"dependencies": {},
	"devDependencies": {
	"electron": "15.3.0"
	}
	}
	// All of the Node.js APIs are available in the preload process.
	// It has the same sandbox as a Chrome extension.
	window.addEventListener('DOMContentLoaded', () => {
	const replaceText = (selector, text) => {
	const element = document.getElementById(selector)
	if (element) element.innerText = text
	}

	for (const type of ['chrome', 'node', 'electron']) {
	replaceText(`${type}-version`, process.versions[type])
	}
	})
	// copied from can-ndjson-stream

	var ndjsonStream = function (response) {
	// For cancellation
	var is_reader, cancellationRequest = false;
	return new ReadableStream({
	start: function (controller) {
	var reader = response.getReader();
	is_reader = reader;
	var decoder = new TextDecoder();
	var data_buf = "";

	reader.read().then(function processResult(result) {
	if (result.done) {
	if (cancellationRequest) {
	// Immediately exit
	return;
	}

	data_buf = data_buf.trim();
	if (data_buf.length !== 0) {
	try {
	var data_l = JSON.parse(data_buf);
	controller.enqueue(data_l);
	} catch (e) {
	controller.error(e);
	return;
	}
	}
	controller.close();
	return;
	}

	var data = decoder.decode(result.value, { stream: true });
	data_buf += data;
	var lines = data_buf.split("\n");
	for (var i = 0; i < lines.length - 1; ++i) {
	var l = lines[i].trim();
	if (l.length > 0) {
	try {
	var data_line = JSON.parse(l);
	controller.enqueue(data_line);
	} catch (e) {
	controller.error(e);
	cancellationRequest = true;
	reader.cancel();
	return;
	}
	}
	}
	data_buf = lines[lines.length - 1];

	return reader.read().then(processResult);
	});

	},
	cancel: function (reason) {
	console.log("Cancel registered due to ", reason);
	cancellationRequest = true;
	is_reader.cancel();
	}
	});
	};

	fetch('testing://stream').then((response) => {
	return ndjsonStream(response.body)
	}).then(async (exampleStream) => {
	const reader = exampleStream.getReader()

	while (true) {
	const value = await reader.read();
	console.log(value.value)
	}
	})