Created
April 16, 2024 08:19
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Electron Fiddle to demonstrate malformed streams with Electron 30.x etc. Send always works (shasum /tmp/myscheme.txt = d269175ac71ed60bb96f08881c39453c8e8d7020). Stream doesn't. Uncommenting the wait makes the stream also work.
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| <!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'; style-src 'self' 'unsafe-inline'"> --> | |
| <title>Stream</title> | |
| </head> | |
| <body> | |
| <button id="send">Send</button><br/> | |
| <button id="stream">Stream</button> | |
| <script src="./renderer.js"></script> | |
| </body> | |
| </html> |
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| const { app, protocol, BrowserWindow } = require("electron"); | |
| const fs = require("node:fs/promises"); | |
| protocol.registerSchemesAsPrivileged([ | |
| { | |
| scheme: "myscheme", | |
| privileges: { | |
| standard: true, | |
| secure: true, | |
| supportFetchAPI: true, | |
| corsEnabled: true, | |
| }, | |
| }, | |
| ]); | |
| app.whenReady().then(() => { | |
| const win = new BrowserWindow(); | |
| win.loadFile("index.html"); | |
| win.webContents.openDevTools(); | |
| protocol.handle("myscheme", async (request) => { | |
| console.log("incoming request"); | |
| try { | |
| await fs.rm("/tmp/myscheme.txt"); | |
| } catch {} | |
| for await (const p of request.body) { | |
| console.log(`got ${p.length} bytes`); | |
| await fs.appendFile("/tmp/myscheme.txt", p); | |
| } | |
| console.log("done"); | |
| return new Response("", { status: 200 }); | |
| }); | |
| }); |
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| const dataStream = () => | |
| new ReadableStream({ | |
| async start(controller) { | |
| for (let i = 0; i < 10; i++) { | |
| // await wait(1000); | |
| controller.enqueue(Array(1024 * 128).fill(+i).join("\n")); | |
| } | |
| controller.close(); | |
| }, | |
| }).pipeThrough(new TextEncoderStream()); | |
| const wait = (ms) => new Promise((resolve) => setTimeout(resolve, ms)); | |
| const send = async () => { | |
| const data = new Uint8Array(await new Response(dataStream()).arrayBuffer()); | |
| return fetch( | |
| new Request("myscheme://host", { | |
| method: "POST", | |
| body: data, | |
| }) | |
| ); | |
| }; | |
| const stream = () => | |
| fetch( | |
| new Request("myscheme://host", { | |
| method: "POST", | |
| body: dataStream(), | |
| duplex: "half", | |
| }) | |
| ); | |
| document.querySelector("#send").addEventListener("click", send); | |
| document.querySelector("#stream").addEventListener("click", stream); |
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