Cannot create a PyWorker from python using Pyodide #1979
Description
Checklist
- I added a descriptive title
- I searched for other issues and couldn't find a solution or duplication
- I already searched in Google and didn't find any good information or help
What happened?
Hello,
I am trying to adapt the worker-input example from polyscript to pyscript, but instead using Pyodide. According to the docs, I should be able to create a worker using a_worker = PyWorker(file). I tried a simpler example, a python script that just spawns a PyWorker that prints "a" to the console. I also used mini-coi to make web workers actually work.
Here is the structure of this test project
pyscript.json:
{
"files": {
"./a.py": "./a.py"
}
}index.html:
<!doctype html>
<html lang="fr">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<link rel="stylesheet" href="https://pyscript.net/releases/2024.1.1/core.css">
<script type="module" src="https://pyscript.net/releases/2024.1.1/core.js"></script>
</head>
<body>
<script type="py" config="./pyscript.json">
from pyscript import PyWorker
worker = PyWorker("./a.py")
</script>
</body>
</html>a.py:
print("a")From the docs, it should work. Unfortunately, it does not, and instead throws an error in the console. What's weird is that it works with micropython. With the following index.html:
<!doctype html>
<html lang="fr">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<link rel="stylesheet" href="https://pyscript.net/releases/2024.1.1/core.css">
<script type="module" src="https://pyscript.net/releases/2024.1.1/core.js"></script>
</head>
<body>
<script type="micropython" config="./pyscript.json">
from polyscript import XWorker
worker = XWorker("./a.py")
</script>
</body>
</html>it actually prints "a" to the console, with no error.
It seems to be a problem with the modules from what i've read in the stacktrace.
What browsers are you seeing the problem on? (if applicable)
Firefox, Chrome
Console info
[pyscript/main] PyScript Ready
TypeError: s is undefined
get blob:http://localhost:8080/7b3e6a6f-c03e-49c4-8f55-61b5e83a3406:2
Ft blob:http://localhost:8080/7b3e6a6f-c03e-49c4-8f55-61b5e83a3406:2
promise callback*Ft blob:http://localhost:8080/7b3e6a6f-c03e-49c4-8f55-61b5e83a3406:2
Ut blob:http://localhost:8080/7b3e6a6f-c03e-49c4-8f55-61b5e83a3406:2
<anonymous> blob:http://localhost:8080/7b3e6a6f-c03e-49c4-8f55-61b5e83a3406:2
value blob:http://localhost:8080/7b3e6a6f-c03e-49c4-8f55-61b5e83a3406:2
Gt blob:http://localhost:8080/7b3e6a6f-c03e-49c4-8f55-61b5e83a3406:2
<anonymous> blob:http://localhost:8080/7b3e6a6f-c03e-49c4-8f55-61b5e83a3406:2
error.js:15:15
stderr error.js:15
onerror core.js:112
sn class.js:69
(Asynchrone : EventListener.handleEvent)
value main.js:67
sn class.js:62
l custom.js:89
PyWorker core.js:111
hiwire_call_bound pyodide.asm.js:9
<anonyme> pyodide.asm.wasm:1421309
<anonyme> pyodide.asm.wasm:1717908
<anonyme> pyodide.asm.wasm:2532200
<anonyme> pyodide.asm.wasm:2493051
<anonyme> pyodide.asm.wasm:2481402
<anonyme> pyodide.asm.wasm:1983178
<anonyme> pyodide.asm.wasm:1717908
<anonyme> pyodide.asm.wasm:2532200
<anonyme> pyodide.asm.wasm:2548688
<anonyme> pyodide.asm.wasm:1718788
<anonyme> pyodide.asm.wasm:1717908
<anonyme> pyodide.asm.wasm:1438814
callPyObjectKwargs pyodide.asm.js:9
callKwargs pyodide.asm.js:9
runPython pyodide.asm.js:9
Nt _python.js:12
t utils.js:61
nn/e[i]< hooks.js:65
run utils.js:53
onReady core.js:186
queue custom.js:149
(Asynchrone : promise callback)
jn custom.js:146Additional Context
Adding to it, it seems pyscript is the actual offender, as even using "mpy" as the script type does not fix it.
<!doctype html>
<html lang="fr">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<link rel="stylesheet" href="https://pyscript.net/releases/2023.11.1/core.css">
<script type="module" src="https://pyscript.net/releases/2023.11.1/core.js"></script>
</head>
<body>
<script type="mpy" config="./pyscript.json">
from polyscript import XWorker
worker = XWorker("./a.py")
</script>
</body>
</html>This does not work for the same reason as the original post.
Another addition, is that pyodide is actually not the one at fault here. Using this snippet :
<!doctype html>
<html lang="fr">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<link rel="stylesheet" href="https://pyscript.net/releases/2023.11.1/core.css">
<script type="module" src="https://pyscript.net/releases/2023.11.1/core.js"></script>
</head>
<body>
<script type="pyodide" config="./pyscript.json">
from polyscript import XWorker
worker = XWorker("./a.py")
</script>
</body>
</html>It actually works! This is quite a messy situation