86 lines
2.4 KiB
Python
86 lines
2.4 KiB
Python
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from functools import wraps
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import threading
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import logging
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class LoggingContext(object):
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__slots__ = ["parent_context", "name", "__dict__"]
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thread_local = threading.local()
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class Sentinel(object):
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__slots__ = []
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def copy_to(self, record):
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pass
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sentinel = Sentinel()
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def __init__(self, name=None):
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self.parent_context = None
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self.name = name
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def __str__(self):
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return "%s@%x" % (self.name, id(self))
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@classmethod
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def current_context(cls):
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return getattr(cls.thread_local, "current_context", cls.sentinel)
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def __enter__(self):
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if self.parent_context is not None:
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raise Exception("Attempt to enter logging context multiple times")
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self.parent_context = self.current_context()
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self.thread_local.current_context = self
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return self
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def __exit__(self, type, value, traceback):
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if self.thread_local.current_context is not self:
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logging.error(
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"Current logging context %s is not the expected context %s",
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self.thread_local.current_context,
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self
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)
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self.thread_local.current_context = self.parent_context
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self.parent_context = None
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def __getattr__(self, name):
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return getattr(self.parent_context, name)
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def copy_to(self, record):
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if self.parent_context is not None:
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self.parent_context.copy_to(record)
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for key, value in self.__dict__.items():
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setattr(record, key, value)
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@classmethod
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def wrap_callback(cls, callback):
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context = cls.current_context()
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@wraps(callback)
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def wrapped(*args, **kargs):
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cls.thread_local.current_context = context
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return callback(*args, **kargs)
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return wrapped
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class LoggingContextFilter(logging.Filter):
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def __init__(self, **defaults):
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self.defaults = defaults
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def filter(self, record):
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context = LoggingContext.current_context()
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for key, value in self.defaults.items():
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setattr(record, key, value)
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context.copy_to(record)
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return True
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class PreserveLoggingContext(object):
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__slots__ = ["current_context"]
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def __enter__(self):
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self.current_context = LoggingContext.current_context()
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def __exit__(self, type, value, traceback):
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LoggingContext.thread_local.current_context = self.current_context
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