The app.shutdown() takes about 30 seconds to shut down?

[v479038280]

The app.shutdown() takes about 30 seconds to shut down,is it normal?
The program contains only one line code ,with no additional logi.

from nicegui import app, ui

ui.button('shutdown', on_click=app.shutdown)

ui.run()

[v479038280]

Here is another version ,it works fine.

from nicegui import app, ui
from datetime import datetime

def shutdown_():
    print(f'start shutdown:  {datetime.now()}')
    app.shutdown()
ui.button('shutdown', on_click=shutdown_)
app.on_shutdown(lambda: print(f'shutdown:  {datetime.now()}'))

ui.run()

The result:

start shutdown:  2024-07-27 12:52:03.628222
shutdown:  2024-07-27 12:52:03.779497

[v479038280]

This one also works fine.

from nicegui import app, ui
from datetime import datetime

ui.button('shutdown', on_click=lambda:(print(datetime.now(),app.shutdown())))
app.on_shutdown(lambda: print(f'shutdown:  {datetime.now()}'))

ui.run()

here is the result:

2024-07-27 12:50:14.455136 None
shutdown:  2024-07-27 12:50:14.653358

[python-and-novella]

It works well,need more details of your environment.

[v479038280]

I'm using python 3.11.5 on windows10 professional with the latest nicegui 1.4.30

[python-and-novella]

run it directly? not debug in ide?

[v479038280]

yes,I run it directly

[v479038280]

from nicegui import app, ui
from datetime import datetime

ui.button('shutdown', on_click=lambda:app.shutdown())
app.on_shutdown(lambda: print(f'shutdown:  {datetime.now()}'))

ui.run(reload=False)

This will also shutdown immediately

[v479038280]

The app.shutdown() takes about 30 seconds to shut down,is it normal? The program contains only one line code ,with no additional logi.

from nicegui import app, ui

ui.button('shutdown', on_click=app.shutdown)

ui.run()

from nicegui import app, ui
from datetime import datetime

ui.button('shutdown', on_click=lambda:app.shutdown())
app.on_shutdown(lambda: print(f'shutdown:  {datetime.now()}'))

ui.run()

This is the same as above

[v479038280]

I test it in Powershell ,it works fine. But when I run it in Vscode ,it has such problem, the terminal with Vscode is actually Powershell

[python-and-novella]

It is a bug of windows terminal.
See it:
Launching in Russian layout causes Ctrl+C and other signal chars to not work · Issue #17197 · microsoft/terminal
microsoft/terminal#17197
Console ReadFile canceled by Ctrl+C fails to set ERROR_OPERATION_ABORTED · Issue #334 · microsoft/terminal
microsoft/terminal#334
Ctrl+C in terminal broken on windows · Issue #1972 · encode/uvicorn
encode/uvicorn#1972

[python-and-novella]

I try it in native cmd and native powershell, it's ok.
It takes about 25s to shutdown in Windows Terminal when Windows Terminal loses focus.

[python-and-novella]

from nicegui import app, ui

ui.button('shutdown1', on_click=lambda :(app.shutdown(), print('\r', end='',sep='')))

ui.run()

[v479038280]

We could use it in such way

[python-and-novella]

@falkoschindler
Should we change shutdown in app.py?
Change

os.kill(os.getppid(), getattr(signal, 'CTRL_C_EVENT' if platform.system() == 'Windows' else 'SIGINT'))

to

os.kill(os.getppid(), getattr(signal, 'CTRL_C_EVENT' if platform.system() == 'Windows' else 'SIGINT'))
print('\r', end='',sep='')

It only happened when terminal loses focus during shutdowning before timeout. But when terminal gets focus,it will react immediately.

[falkoschindler]

@python-and-fiction When implementing PR #3320, we decided not to add \r because it felt quite hacky and it is ultimately a bug in VSCode - as far as we understand. So I recommend adding a wrapper function in user code if running in VSCode is too much of a hassle.