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https://github.com/sprockets/sprockets.logging.git
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39 lines
1.1 KiB
Python
39 lines
1.1 KiB
Python
"""
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Make good log output easier.
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- :class:`ContextFilter` adds fixed properties to a log record
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"""
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from __future__ import absolute_import
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import logging
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version_info = (1, 0, 0)
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__version__ = '.'.join(str(v) for v in version_info)
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class ContextFilter(logging.Filter):
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"""
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Ensures that properties exist on a LogRecord.
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:param list|None properties: optional list of properties that
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will be added to LogRecord instances if they are missing
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This filter implementation will ensure that a set of properties
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exists on every log record which means that you can always refer
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to custom properties in a format string. Without this, referring
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to a property that is not explicitly passed in will result in an
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ugly ``KeyError`` exception.
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"""
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def __init__(self, name='', properties=None):
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logging.Filter.__init__(self, name)
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self.properties = list(properties) if properties else []
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def filter(self, record):
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for property_name in self.properties:
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if not hasattr(record, property_name):
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setattr(record, property_name, None)
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return True
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