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I am building a Python 3.11 Flask-SocketIO project into an .exe using PyInstaller on Jenkins (Windows 10). The project works fine when I run it locally with python runapp.py or even inside Jenkins using python runapp.py. But when I run the generated .exe from PyInstaller, I always get:

ValueError: Invalid async_mode specified

I force async_mode="gevent" in my __init__.py:

import gevent.monkey
gevent.monkey.patch_all()

from flask_socketio import SocketIO
socketio = SocketIO(app, cors_allowed_origins="*", async_mode="gevent")

All dependencies are installed (gevent==25.8.2, gevent-websocket==0.10.1, greenlet==3.2.4, Flask-SocketIO==5.3.6, etc). eventlet has been removed to avoid conflicts.

My .spec includes:

hiddenimports = [
    'gevent',
    'gevent.monkey',
    'gevent.threading',
    'gevent._socket3',
    'gevent._threading',
    'gevent._semaphore',
    'gevent.builtins',
    'geventwebsocket',
    'greenlet',
    'engineio.async_drivers.threading',
    'engineio.async_drivers.gevent',
    'engineio.async_drivers.gevent_uwsgi',
    'engineio.async_drivers.aiohttp',
    'asyncio',
]

When running PyInstaller I also see warnings like:

ERROR: Hidden import 'engineio.async_drivers.asyncio' not found

But I verified that asyncio is available at: C:\Users\Innopharm\AppData\Local\Programs\Python\Python311\Lib\asyncio

Why does this work fine when running python runapp.py, but fails when running the PyInstaller .exe? What am I missing in PyInstaller hidden imports or configuration?

for more additional information the output from the runapp.exe:

Traceback (most recent call last): File "runapp.py", line 2, in <module> File "<frozen importlib._bootstrap>", line 1360, in _find_and_load File "<frozen importlib._bootstrap>", line 1331, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 935, in _load_unlocked File "PyInstaller\loader\pyimod02_importers.py", line 378, in exec_module File "theone\__init__.py", line 97, in <module> File "flask_socketio\__init__.py", line 187, in __init__ File "flask_socketio\__init__.py", line 243, in init_app File "socketio\base_server.py", line 31, in __init__ File "engineio\base_server.py", line 81, in __init__ ValueError: Invalid async_mode specified [PYI-9784:ERROR] Failed to execute script 'runapp' due to unhandled exception!

I expect the EXE can run

Improve this question
6
  • is this full error? always put full error message (traceback) because there are other useful information. Commented Oct 2 at 11:03
  • 1
    maybe engineio.async_drivers.asyncio and \Lib\asyncio are two different objects. And when you don't add engineio.async_drivers.asyncio then \Lib\asyncio may not work. Commented Oct 2 at 11:04
  • @furas 47766 ERROR: Hidden import 'engineio.async_drivers.asyncio' not found. that is output from jenkins and i will edit my post to add the error output Commented Oct 3 at 2:03
  • @furas if you want my full code and files i can send you via email Commented Oct 3 at 2:07
  • I don't want code via email - on Stackoverflow code has to be in question, not in email or links to external places. But I think it doesn't need full code. You have to check if there is engineio and if it has .async_drivers.asyncio, not \Lib\asyncio - because it is not the same. it seems engineio can mean module python-engineio Commented Oct 3 at 12:48
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