Nicegui - Package for Installation - multiple processes and multiple rebindings

[finalnode]

Question

Hi,

first of all, I love your work, thank you so much.
I want to deploy the example of the documentation via pyinstaller (https://nicegui.io/documentation#package_for_installation) on MacOS Ventura 13.4.1 on an Intel machine.

• If it is only one file without windowed, I get the follow problem, if I run the binary:

NiceGUI ready to go on http://localhost:8080, and http://192.168.178.23:8080
NiceGUI ready to go on http://localhost:8080, and http://192.168.178.23:8080
ERROR:    [Errno 48] error while attempting to bind on address ('0.0.0.0', 8080): address already in use
NiceGUI ready to go on http://localhost:8080, and http://192.168.178.23:8080
ERROR:    [Errno 48] error while attempting to bind on address ('0.0.0.0', 8080): address already in use
NiceGUI ready to go on http://localhost:8080, and http://192.168.178.23:8080
ERROR:    [Errno 48] error while attempting to bind on address ('0.0.0.0', 8080): address already in use
...

• If it is also windowed and I start the .app, the process will be started n-times, until I close the window.

Does anyone have an idea about this problem?

Best regards and thx

Sebastian

[rodja]

Looks identical to #1207, which we closed because we've been waiting for informations from @Devil-Ryu.
But your statement of using

from nicegui import ui

ui.label('Hello from PyInstaller')

ui.run(reload=False)

got me thinking. In native mode we search for the next free port as explained for example in #1457. But the example code above does no such thing. Thereby if the port is already taken the NiceGUI server can not start.

Could you try

from nicegui import native_mode, ui

ui.label('Hello from PyInstaller')

ui.run(reload=False, port=native_mode.find_open_port())

[finalnode]

Yes, closed it -> no binding problems, thank you :).

The other problem is still there:

NiceGUI ready to go on http://localhost:8001
Traceback (most recent call last):
  File "multiprocessing/resource_tracker.py", line 209, in main
KeyError: '/mp-0_vc_nu9'
Traceback (most recent call last):
  File "multiprocessing/resource_tracker.py", line 209, in main
KeyError: '/mp-wj3327p9'
Traceback (most recent call last):
  File "multiprocessing/resource_tracker.py", line 209, in main
KeyError: '/mp-s6qh0nnj'
Traceback (most recent call last):
  File "multiprocessing/resource_tracker.py", line 209, in main
KeyError: '/mp-29jrns4d'
Traceback (most recent call last):
  File "multiprocessing/resource_tracker.py", line 209, in main
KeyError: '/mp-0tdpxq0s'
Traceback (most recent call last):
  File "multiprocessing/resource_tracker.py", line 209, in main
KeyError: '/mp-qfi4flps'
multiprocessing/resource_tracker.py:224: UserWarning: resource_tracker: There appear to be 6 leaked semaphore objects to clean up at shutdown
multiprocessing/resource_tracker.py:237: UserWarning: resource_tracker: '/mp-s6qh0nnj': [Errno 2] No such file or directory
multiprocessing/resource_tracker.py:237: UserWarning: resource_tracker: '/mp-qfi4flps': [Errno 2] No such file or directory
multiprocessing/resource_tracker.py:237: UserWarning: resource_tracker: '/mp-29jrns4d': [Errno 2] No such file or directory
multiprocessing/resource_tracker.py:237: UserWarning: resource_tracker: '/mp-wj3327p9': [Errno 2] No such file or directory
multiprocessing/resource_tracker.py:237: UserWarning: resource_tracker: '/mp-0tdpxq0s': [Errno 2] No such file or directory
multiprocessing/resource_tracker.py:237: UserWarning: resource_tracker: '/mp-0_vc_nu9': [Errno 2] No such file or directory

It is never ending to start the app :(.

[rodja]

What is this other problem? Could you please start a new discussion for that. Best to keep topics separated.

[Devil-Ryu]

Has this problem been solved？

[infintropy]

https://bugs.python.org/issue46391

This is a python 3.8+ issue. @rodja I was actually seeking to circumvent this as I'm using multiprocessing, macos, py3.11, freezing a native app.

When I went to downgrade to 3.7 to run my app, noticed I am limited to nicegui 1.2.x. Seems like for the multiprocessing folks out there freezing this may be an issue if you want to use any modern Nicegui version.

Not sure how to proceed personally but am considering other options on packaging.

[roblight]

It's not clear to me if this is a Python or NiceGUI issue based on this:

python/cpython#90549 (comment)