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| 1 | +<!DOCTYPE html> |
| 2 | +<html lang="en"> |
| 3 | +<head> |
| 4 | + <meta charset="UTF-8"> |
| 5 | + <meta name="viewport" content="width=device-width, initial-scale=1.0"> |
| 6 | + <title>Polyscript Long Running Worker</title> |
| 7 | + |
| 8 | + <!-- this is the setup module script to expose long running Worker --> |
| 9 | + <script type="module"> |
| 10 | + // grab utilities to bootstrap a Worker out of the blue |
| 11 | + import { Hook, XWorker } from 'https://cdn.jsdelivr.net/npm/polyscript'; |
| 12 | + |
| 13 | + const runtimeURL = URL.createObjectURL(new Blob([''])); |
| 14 | + |
| 15 | + // instrument the XWorker context |
| 16 | + const xworker = XWorker.call( |
| 17 | + new Hook(null, { |
| 18 | + worker: { |
| 19 | + // setup the I/O + expose runAsync + init on main |
| 20 | + onReady: ({ runAsync, io }, { sync }) => { |
| 21 | + io.stdout = line => sync.stdout(line); |
| 22 | + io.stderr = line => sync.stderr(line); |
| 23 | + // from main any callback is async anyway |
| 24 | + // this is why either run or runAsync would do the same |
| 25 | + sync.runAsync = runAsync; |
| 26 | + sync.init(); |
| 27 | + }, |
| 28 | + }, |
| 29 | + }), |
| 30 | + |
| 31 | + // the "fake" URL to use as worker script |
| 32 | + runtimeURL, |
| 33 | + |
| 34 | + // either pyodide or micropython |
| 35 | + { type: 'pyodide' } |
| 36 | + ); |
| 37 | + |
| 38 | + // once resolved everything is ready to work |
| 39 | + const { promise, resolve } = Promise.withResolvers(); |
| 40 | + |
| 41 | + // expose utilities for I/O and cleanup + resolver |
| 42 | + const { sync } = xworker; |
| 43 | + sync.stdout = console.log; |
| 44 | + sync.stderr = console.error; |
| 45 | + sync.init = () => { |
| 46 | + // drop the URL as it's not needed anymore |
| 47 | + URL.revokeObjectURL(runtimeURL); |
| 48 | + // expose the proxied/bridge `runAsync` utility |
| 49 | + // as callback to await for results |
| 50 | + resolve(code => sync.runAsync(code)); |
| 51 | + }; |
| 52 | + |
| 53 | + // define some "not so obtrusive" global entrypoint |
| 54 | + // or dispatch an event once the worker is ready |
| 55 | + globalThis[Symbol.for('pyodide-worker')] = promise; |
| 56 | + </script> |
| 57 | + |
| 58 | + <!-- this is any other script on the page --> |
| 59 | + <script type="module"> |
| 60 | + const runPython = code => globalThis[Symbol.for('pyodide-worker')].then( |
| 61 | + runAsync => runAsync(code) |
| 62 | + ); |
| 63 | + |
| 64 | + document.getElementById('sum').addEventListener( |
| 65 | + 'click', |
| 66 | + async event => { |
| 67 | + event.preventDefault(); |
| 68 | + const { currentTarget } = event; |
| 69 | + const result = await runPython(currentTarget.textContent); |
| 70 | + currentTarget.textContent += ` + ${result}`; |
| 71 | + document.getElementById('result').textContent = result; |
| 72 | + } |
| 73 | + ); |
| 74 | + </script> |
| 75 | +</head> |
| 76 | +<body> |
| 77 | + <button id="sum">2 + 3</button> |
| 78 | + <pre id="result"></button> |
| 79 | +</body> |
| 80 | +</html> |
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