@Marvin im trying to run an async function as part of a task and getting the below error using pyppeteer ValueError: signal only works in main thread of the main interpreter

It seems that you have encountered a threading issue while trying to use

pyppeteer

asynchronously within a task. This particular error occurs because Python's

signal

module does not allow setting new signal handlers outside the main thread, and

pyppeteer

attempts to set a

SIGINT

handler when it is launched. Here’s a relevant GitHub issue from the

pyppeteer

repository that discusses a similar error: Can't run pyppeteer with Threads? - ValueError: signal only works in main thread of the main interpreter. The issue suggests that the use of threads in conjunction with

pyppeteer

can lead to this error. There isn't a direct solution from the Prefect documentation available at the moment, but a common workaround for issues like this involves running the offending code in a separate process rather than in a thread. You might consider using Python’s

multiprocessing

module or run the

pyppeteer

code within a dedicated executor using

concurrent.futures.ProcessPoolExecutor

to avoid clashes with signal handling in the main thread. Please check the linked GitHub issue for more context, and you may want to consider looking into process-based parallelism or the proper use of asynchronous and synchronous code in Prefect tasks to resolve the issue you're facing.

i would not use multiprocessing here, I would just run your pyppeteer stuff in a subflow so its in the main thread