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python.worker.mjs

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v3.14.8

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python.worker.mjs

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import createEmscriptenModule from "./python.mjs";

class StdinBuffer {

constructor() {

this.sab = new SharedArrayBuffer(128 * Int32Array.BYTES_PER_ELEMENT);

this.buffer = new Int32Array(this.sab);

this.readIndex = 1;

this.numberOfCharacters = 0;

this.sentNull = true;

}

prompt() {

this.readIndex = 1;

Atomics.store(this.buffer, 0, -1);

postMessage({

type: "stdin",

buffer: this.sab,

});

Atomics.wait(this.buffer, 0, -1);

this.numberOfCharacters = this.buffer[0];

}

stdin = () => {

while (this.numberOfCharacters + 1 === this.readIndex) {

if (!this.sentNull) {

// Must return null once to indicate we're done for now.

this.sentNull = true;

return null;

}

this.sentNull = false;

// Prompt will reset this.readIndex to 1

this.prompt();

}

const char = this.buffer[this.readIndex];

this.readIndex += 1;

return char;

};

}

const stdout = (charCode) => {

if (charCode) {

postMessage({

type: "stdout",

stdout: charCode,

});

} else {

console.log(typeof charCode, charCode);

}

};

const stderr = (charCode) => {

if (charCode) {

postMessage({

type: "stderr",

stderr: charCode,

});

} else {

console.log(typeof charCode, charCode);

}

};

const stdinBuffer = new StdinBuffer();

const emscriptenSettings = {

noInitialRun: true,

stdin: stdinBuffer.stdin,

stdout: stdout,

stderr: stderr,

onRuntimeInitialized: () => {

postMessage({ type: "ready", stdinBuffer: stdinBuffer.sab });

},

async preRun(Module) {

const versionInt = Module.HEAPU32[Module._Py_Version >>> 2];

const major = (versionInt >>> 24) & 0xff;

const minor = (versionInt >>> 16) & 0xff;

// Prevent complaints about not finding exec-prefix by making a lib-dynload directory

Module.FS.mkdirTree(`/lib/python${major}.${minor}/lib-dynload/`);

Module.addRunDependency("install-stdlib");

const resp = await fetch(`python${major}.${minor}.zip`);

const stdlibBuffer = await resp.arrayBuffer();

Module.FS.writeFile(

`/lib/python${major}${minor}.zip`,

new Uint8Array(stdlibBuffer),

{ canOwn: true },

);

Module.removeRunDependency("install-stdlib");

},

};

const modulePromise = createEmscriptenModule(emscriptenSettings);

onmessage = async (event) => {

if (event.data.type === "run") {

const Module = await modulePromise;

if (event.data.files) {

for (const [filename, contents] of Object.entries(event.data.files)) {

Module.FS.writeFile(filename, contents);

}

}

const ret = Module.callMain(event.data.args);

postMessage({

type: "finished",

returnCode: ret,

});

}

};