The alternative to a new setting would be to revert the "merging" behavior
of the django.utils.log.DEFAULT_LOGGING and settings.LOGGING entirely. This
original design was proposed by Claude in
https://code.djangoproject.com/ticket/18993#comment:7, but now we realize
disable_existing_loggers=True doesn't work as expected in that proposal. I
also find that writing a nice configuration that uses
disable_existing_loggers=False and that merges nicely with Django's
defaults to be difficult (for example, in trying to output all log entries
to the console, some as simple as the config below [1] won't work because
Django's DEFAULT_LOGGING has handlers for 'django.request' and
'django.security' which don't propagate their entries (I couldn't tell the
reason for this from
https://github.com/django/django/commit/f0f327bbfe1caae6d11fbe20a3b5b96eed1704cf#diff-246800ac266982b8ad12f505352a662eR63)
I would like to ask if anyone who is using settings.LOGGING could share
their config so we can get a sense of different use cases?
[1] An attempt to write a LOGGING config that outputs all entires to
stdout, but doesn't entirely work as stated above.
LOGGING = {
'version': 1,
'handlers': {
'console': {
'level': 'DEBUG',
'class': 'logging.StreamHandler',
},
},
# A catch-all root logger.
'root': {
'handlers': ['console'],
'level': 'DEBUG',
},
}
On Monday, March 23, 2015 at 12:31:06 PM UTC-4, Carl Meyer wrote:
>
> On 03/22/2015 08:23 PM, Carl Meyer wrote:
> > The first, more complex and more important question is: how do we fix
> > Django's logging config process to be less broken, so that the best
> > advice for getting it to do what you what isn't "disable Django's
> > interference entirely and do it yourself."? I don't have a
> > fully-packaged solution ready to propose here; someone will need to dig
> > into it. Probably the biggest sticking point to get around will be
> > backwards compatibility.
> >
> > I'm pretty sure that a good solution will include an optional way to
> > prevent Django from ever installing its default logging config in the
> > first place, since it seems there's no way to tell logging to "clear out
> > everything and start fresh" once some configuration has been set.
> >
> > And I think it will also mean that we stop ever recommending the use of
> > "disable_existing_loggers" (and probably even include a callout in our
> > docs warning users against it). It seems that "disable_existing_loggers"
> > is a bad feature with surprising behavior, and our current docs were
> > written based on a misunderstanding of what it does.
>
> After giving this a bit more thought, I think at least the first step of
> a better solution may not be too hard, and could be integrated
> immediately along with the doc changes.
>
> The problem is that the current system always installs the default
> logging config, and expects that you can use `disable_existing_loggers:
> True` to undo that if you want, but `disable_existing_loggers: True`
> doesn't do the right thing at all. So really we just need a way to skip
> installing Django's default logging config, if you don't want it. I
> think the simplest solution is to just add a `LOGGING_SKIP_DEFAULTS`
> setting which can be set to `True` to prevent Django from ever
> installing its default logging config. Aside from that, the rest of the
> `LOGGING_CONFIG/LOGGING` system is functional and fine as is, I think.
>
> The harder problem is figuring out how to have new projects default to
> good in-development console logging in DEBUG mode, without breaking
> back-compat for older projects. But I don't think we should hold up
> incremental improvement while waiting for a solution to that -- having a
> proper way to bypass Django's default logging, and fixing our
> documentation to be accurate, would be a big step forward.
>
> Carl
>
>
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