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# -*- coding: utf-8 -*- |
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import logging |
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from functools import wraps |
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from ._compat import PY3, string_types |
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if PY3: |
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_wrapped_method_names = { |
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name.lower() |
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for name in logging._nameToLevel.keys() |
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} |
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else: |
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_wrapped_method_names = { |
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name.lower() |
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for name in logging._levelNames.keys() |
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if isinstance(name, string_types) |
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} |
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_wrapped_method_names.update({ |
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'exception', |
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}) |
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class LoggerProxy(object): |
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""" |
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Proxy for `logging.Logger` and classes inherited from it. |
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Automatically injects prefixes to messages which are send to log. |
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This reduces overhead of |
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>>> logger.log_level(injector.mark("mesage")) |
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just to |
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>>> logger.log_level("message") |
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""" |
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def __init__(self, logger, injector): |
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self._original = logger |
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self._injector = injector |
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def __getattr__(self, name): |
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""" |
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Get attribute of original logger or wrapped version of methods used |
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for logging. |
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We do not wrap calls to `debug`, `info`, etc. directly. This is because |
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those levels are default, but their list may be extended, for example, |
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like in case of `python-verboselogs` library. |
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""" |
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result = getattr(self._original, name) |
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if name in _wrapped_method_names: |
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@wraps(result) |
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def wrapper(message, *args, **kwargs): |
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return result(self._injector.mark(message), *args, **kwargs) |
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# Cache wrapper, so it won't be constructed again for future calls. |
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setattr(self, name, wrapper) |
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return wrapper |
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return result |
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oblalex /
isotopic-logging
