xworker events does not get populated

[bugzpodder]

demo: https://bugzpodder.pyscriptapps.com/xworker-sync-hangs-when-raise-error-copy-copy-copy/latest/

I have specified onmessage (expecting pyodide:ready) and onerror (exepectng error to get passed here) callback and they does not get called in the code.

Let me know if I am doing something wrong.

[WebReflection]

this is how we set the onerror to the PyWorker https://github.com/pyscript/pyscript/blob/next/pyscript.core/src/core.js#L78-L82

[WebReflection]

@bugzpodder is this still an issue or you changed anything and now it's all good? Thanks!

[bugzpodder]

it's unclear to me. I haven't gotten either onmessage and onerror working but I understand for onmessage you can do something like js.postMessage. In your code it seems that worker.onerror should work but so far I haven't successfully gotten it actually working in my example.

[edit] tested again js.postMessage works as a proxy to onmessage. onerror doesnt seem to work. latest polyscript: https://pyscript.com/@bugzpodder/xworker-sync-hangs-when-raise-error-copy-copy-copy-copy-77754-copy-copy/latest

[bugzpodder]

ok was able to get 'pyodide:done' and 'pyodide:ready' customevent on a div with target id from a worker. I was listening to postMessage so nothing was there. now need to figure out onerror..

[WebReflection]

ok was able to get 'pyodide:done' and 'pyodide:ready' customevent on a div with target id from a worker

hopefully in inverted order 😅

I was listening to postMessage so nothing was there. now need to figure out onerror..

I'll try to figure out what is it that doesn't work

[WebReflection]

it was a bit convoluted to run your example locally and understand what's going on ... I'd love to have issues with no home-made bootstrap logic, if possible, simply to speedup possible investigations and fixes, thanks.

that being said, I think this is a classic case where in pyodide we can't handle those errors:
pyodide/pyodide#3938

until that bug is fixed and we work to understand how to benefit eventually from that fix, I am afraid there's not much I can do in here as I can't catch that error myself so it's a bit of a gotcha we need to live with for the time being, but at least the error is shown in devtools so this is a half blocking situation.

I will flag this as 3rd party issue and work once that gets resolved.

[bugzpodder]

Thanks. what does worker.onerror do if anything: https://github.com/pyscript/pyscript/blob/main/pyscript.core/src/core.js#L61

is it trapping stderr (i don't see it being invoked either)

[WebReflection]

It’s meant for plugins but it’s not triggered unless stderr is explicitly used via print file=stderr