✨ Add metadata filter support for context logger#297
✨ Add metadata filter support for context logger#297
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gabe-l-hart
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gabe-l-hart
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Thanks for putting this together @gkumbhat! I think we want to look carefully at LoggerAdapter instead of logging.Filter, and I think the naming could be cleaned up a little. Also, it's probably worth using a separate scope object rather than just ScopedLog since that's explicitly designed to add Start/End blocks. Something like ScopedMetadata.
| """ | ||
| return logging.getLogger(channel) | ||
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| ## Logger Filters ############################################################## |
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Hmmm, this is interesting. I have two reactions to this:
- I don't think this is what
logging.Filteris meant to do. I think LogAdapter is probably the more correct utility for this type of contextual information. - This makes me think that some of the
alogfunctionality around filtering should be refactored to uselogging.Filterin a more standard way
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I tried to use LogAdapter, however, but it modifies the logger which is read only inside _ScopedLog
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Filters are also designed / recommended for this use-case it seems: https://docs.python.org/3/howto/logging-cookbook.html#filters-contextual
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This makes me think that some of the alog functionality around filtering should be refactored to use logging.Filter in a more standard way
I was thinking same while exploring adapters and filtering.
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Also current implementation isn't thread safe. I think for it to be threadsafe, I'll need to save this metadata in a threadlng.local based class object similar to how we do it for indent. Was wondering if there would be any concerns for that?
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Yeah, this is the nastiest part IMO. I think we'd want some careful threading behavior:
- Independent threads manage independent
metadatacontexts - Spawned threads inherit context
metadatafrom parents - Closing a metadata scope removes the metadata from the thread where the scope was created
- I'm honestly not sure what should happen to threads spawned by this parent thread while the scope was open
Also, the same behavior should probably be true of spawned processes
| else: | ||
| log_record['message'] = str(record_args) | ||
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| if hasattr(record, "additional_ctxt_metadata"): |
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If we're going to have a "special" string for this, I think it should be (a) a constant, and (b) a __dunder__ name
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Yes, certainly. Will update the PR
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