On Wednesday, August 23, 2023 at 9:55:49 PM UTC-7 [email protected] wrote:
We have activated logging in our applications and have defined 2 back-ups
for the rotation.
We often get errors when running web2py shell scripts because I think that
the the web2py web application and the web2py shell script are both trying
to access the log file. It looks like it is trying to perform a rotation
at the moment of the error.
It's not clear to me whether the application or the shell script is getting
this error. What gets logged when running the scripts? Does this happen
when loading the script? What is b_console.py doing? Generally, models
don't contain procedural code, except for things like custom validators,
and in web2py models get loaded on every hit (http requests or shell start
ups if you use -M).
That said, I haven't had issues with log rotation, even on a production
application (running on Amazon Linux). My non-production apps, of course,
don't have a lot of traffic, and my big WinError issue is not with logging,
but writing a temporary file and then renaming it; sometimes the OS hasn't
finished its background work from the close before the rename is
attempted.
My non-production apps use SQLite3, so there are some "database locked"
conflicts occasionally.
Can anyone give me an idea on how we can resolve with this conflict without
disabling rotation?
Well, using a hammer where screwdriver is needed, you might have the shell
script check the size of the log file, and bail out if the size is too near
the rotation threshold.
Here is the full output:
--- Logging error ---
Traceback (most recent call last):
File "D:\Python\Miniconda3\envs\web2py_XYZ\lib\logging\handlers.py", line
74, in emit
self.doRollover()
File "D:\Python\Miniconda3\envs\web2py_XYZ\lib\logging\handlers.py", line
177, in doRollover
self.rotate(self.baseFilename, dfn)
File "D:\Python\Miniconda3\envs\web2py_XYZ\lib\logging\handlers.py", line
115, in rotate
os.rename(source, dest)
PermissionError: [WinError 32] The process cannot access the file because
it is being used by another process:
'D:\\Data\\XYZ\\applications\\MyApp\\private\\app.log' ->
'D:\\Data\\XYZ\\applications\\MyApp\\private\\app.log.1'
Call stack:
File "D:\Data\XYZ\web2py.py", line 58, in <module>
gluon.widget.start()
File "D:\Data\XYZ\gluon\widget.py", line 746, in start
run(options.shell, plain=options.plain, bpython=options.bpython,
File "D:\Data\XYZ\gluon\shell.py", line 280, in run
_env = env(a, c=c, f=f, import_models=import_models,
extra_request=extra_request)
File "*D:\Data\XYZ\gluon\shell.py"*, line 181, in env
run_models_in(environment)
File "D:\Data\XYZ\gluon\compileapp.py", line 563, in run_models_in
restricted(ccode, environment, layer=model)
File "D:\Data\XYZ\gluon\restricted.py", line 219, in restricted
exec(ccode, environment)
File "applications\MyApp\models\b_console.py", line 153, in <module>
console.log(source='b_console.py', message=str(console),
add_timestamp=True)
File "applications\MyApp\models\b_console.py", line 147, in log
logger.debug(msg=out_log)
Thanks in advance,
David
Good luck!
/dps
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