Using asyncio in custom extenstion but not working in usd composer app

[yuchunlin33]

i develop a customer extension by using kit-app-template repo (NVIDIA-Omniverse/kit-app-template: Omniverse Kit App Template) and i use asyncio for handle api query and streaming data.
everything in workable in my-app(also developed by kit-app-template) + my-extension.

however, i want to use the extension in USD composer
it’s not working
the error shows “there is no current event loop in thread MainThread”
and i can’t close the USD composer window, too.(need to terminate through task-manager)

i had try some method but still can not solve the problem. so i want to ask if there’s any suggestion?

thanks for the information.

below is the code in extension.py and error.log file

def on_click_trigger_sumo_api(self, action):
    asyncio.run(SUMO.post_sumo_action(self.sumo_project_label.text, action))
 
def on_click_get_sumo_streaming(self):
    run_loop = asyncio.get_event_loop()
    run_loop.create_task(SUMO.get_sumo_streaming(self.sumo_project_label.text))

kit_20250117_114158.log (2.2 MB)

[Richard3D]

Let me see if I can get someone to help with this

[Richard3D]

Sorry for the delay. It seems you may have encounted a bug in our template that we will need to fix. A ticket has been made to fix and track this.

First of all, here is a document link on using Asyncio Usage Examples — Omniverse Kit

Second we see an error in your log that there is no loop in your main code. This is the bug we are looking into
[Error] [omni.ui.python] RuntimeError: There is no current event loop in thread ‘MainThread’.

[yuchunlin33]

thanks for the reply.
and want to make sure can i receive the update once the ticket be solved?

[Richard3D]

Yes once this is fixed it will be in the next version of Kit