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Implement Blob URLs for Node (experiment) #32

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Implement Blob URLs for Node (experiment) #32

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229cde8
Experimental attempt to implement blob urls for node
msikma Aug 8, 2022
34b0788
Fix style
msikma Aug 8, 2022
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38 changes: 26 additions & 12 deletions node.js
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,10 @@
import URL from 'url';
import VM from 'vm';
import threads from 'worker_threads';
import { resolveObjectURL } from 'node:buffer';

const isDataUrl = s => /^data:/.test(s);
const isBlobUrl = s => /^blob:/.test(s);

const WORKER = Symbol.for('worker');
const EVENTS = Symbol.for('events');
Expand Down Expand Up @@ -93,16 +97,20 @@ function mainThread() {
super();
const { name, type } = options || {};
url += '';
let mod;
if (/^data:/.test(url)) {
let mod, blobUrl;
if (isDataUrl(url)) {
mod = url;
}
else if (isBlobUrl(url)) {
mod = url;
blobUrl = resolveObjectURL(url);
}
else {
mod = URL.fileURLToPath(new URL.URL(url, baseUrl));
}
const worker = new threads.Worker(
__filename,
{ workerData: { mod, name, type } }
{ workerData: { mod, name, type, blobUrl } }
);
Object.defineProperty(this, WORKER, {
value: worker
Expand Down Expand Up @@ -131,8 +139,8 @@ function mainThread() {
return Worker;
}

function workerThread() {
let { mod, name, type } = threads.workerData;
async function workerThread() {
let { mod, name, type, blobUrl } = threads.workerData;

// turn global into a mock WorkerGlobalScope
const self = global.self = global;
Expand Down Expand Up @@ -173,11 +181,10 @@ function workerThread() {
});
global.name = name;

const isDataUrl = /^data:/.test(mod);
if (type === 'module') {
import(mod)
.catch(err => {
if (isDataUrl && err.message === 'Not supported') {
if ((isDataUrl(mod) || blobUrl) && err.message === 'Not supported') {
console.warn('Worker(): Importing data: URLs requires Node 12.10+. Falling back to classic worker.');
return evaluateDataUrl(mod, name);
}
Expand All @@ -187,8 +194,8 @@ function workerThread() {
}
else {
try {
if (/^data:/.test(mod)) {
evaluateDataUrl(mod, name);
if (isDataUrl(mod) || blobUrl) {
await evaluateDataUrl(mod, name, blobUrl);
}
else {
require(mod);
Expand All @@ -201,14 +208,21 @@ function workerThread() {
}
}

function evaluateDataUrl(url, name) {
const { data } = parseDataUrl(url);
async function evaluateDataUrl(url, name, blobUrl) {
const { data } = await parseDataUrl(url, blobUrl);
return VM.runInThisContext(data, {
filename: 'worker.<'+(name || 'data:')+'>'
});
}

function parseDataUrl(url) {
async function parseDataUrl(url, blobUrl) {
if (blobUrl) {
return {
type: blobUrl.type,
data: await blobUrl.text()
};
}

let [m, type, encoding, data] = url.match(/^data: *([^;,]*)(?: *; *([^,]*))? *,(.*)$/) || [];
if (!m) throw Error('Invalid Data URL.');
if (encoding) switch (encoding.toLowerCase()) {
Expand Down