I'm having trouble starting up my first python nameko service

Question

I'm getting the following stack trace:

Traceback (most recent call last):
File "", line 991, in _find_and_load
File "", line 975, in _find_and_load_unlocked
File "", line 671, in _load_unlocked
File "", line 783, in exec_module
File "", line 219, in _call_with_frames_removed
File "c:\users\x\appdata\local\programs\python\python38\lib\site-packages\nameko\cli\run.py", line 4, in
eventlet.monkey_patch() # noqa (code before rest of imports)
File "c:\users\x\appdata\local\programs\python\python38\lib\site-packages\eventlet\patcher.py", line 334, in monkey_patch
fix_threading_active()
File "c:\users\x\appdata\local\programs\python\python38\lib\site-packages\eventlet\patcher.py", line 331, in fix_threading_active
_os.register_at_fork(
AttributeError: module 'os' has no attribute 'register_at_fork'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "c:\users\x\appdata\local\programs\python\python38\lib\runpy.py", line 194, in _run_module_as_main return _run_code(code, main_globals, None,
File "c:\users\x\appdata\local\programs\python\python38\lib\runpy.py", line 87, in run_code
exec(code, run_globals)
File "C:\Users\x\AppData\Local\Programs\Python\Python38\Scripts\nameko.exe_main.py", line 7, in
File "c:\users\x\appdata\local\programs\python\python38\lib\site-packages\nameko\cli\main.py", line
112, in main
args.main(args)
File "c:\users\x\appdata\local\programs\python\python38\lib\site-packages\nameko\cli\commands.py", line
109, in main
from .run import main
File "", line 991, in _find_and_load
File "", line 152, in exit
File "", line 107, in release
RuntimeError: cannot release un-acquired lock

this is my pip freeze :
amqp==2.6.1
astroid==2.4.2
certifi==2020.6.20
chardet==3.0.4
colorama==0.4.3
dnspython==1.16.0
eventlet==0.27.0
greenlet==0.4.16
idna==2.10
isort==5.5.2
kombu==4.6.11
lazy-object-proxy==1.4.3
mccabe==0.6.1
mock==4.0.2
monotonic==1.5
nameko==2.12.0
path==15.0.0
path.py==12.5.0
pylint==2.6.0
PyYAML==5.3.1
requests==2.24.0
six==1.15.0
toml==0.10.1
urllib3==1.25.10
vine==1.3.0
virtualenv==20.0.31
Werkzeug==1.0.1
wrapt==1.12.1

Answer 1

Based on the stack trace you provided here, it is evident you're working within a Windows environment. nameko does not support Windows-based environments. There is an open issue in the nameko GitHub repository requesting support for Windows (among others), but there hasn't been any movement on this since April 2019.

Specifically, Python's os.register_at_fork method, the one that's causing your error ("AttributeError: module 'os' has no attribute 'register_at_fork'"), is only available on Unix-based systems.