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Merge pull request #427 from matrix-org/markjh/log_context
Add a setter for the current log context.
This commit is contained in:
commit
a190b2e85e
1 changed files with 24 additions and 16 deletions
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@ -87,13 +87,26 @@ class LoggingContext(object):
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"""Get the current logging context from thread local storage"""
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return getattr(cls.thread_local, "current_context", cls.sentinel)
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@classmethod
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def set_current_context(cls, context):
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"""Set the current logging context in thread local storage
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Args:
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context(LoggingContext): The context to activate.
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Returns:
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The context that was previously active
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"""
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current = cls.current_context()
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if current is not context:
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current.stop()
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cls.thread_local.current_context = context
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context.start()
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return current
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def __enter__(self):
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"""Enters this logging context into thread local storage"""
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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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self.start()
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self.parent_context = self.set_current_context(self)
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return self
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def __exit__(self, type, value, traceback):
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@ -102,17 +115,16 @@ class LoggingContext(object):
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Returns:
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None to avoid suppressing any exeptions that were thrown.
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"""
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if self.thread_local.current_context is not self:
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if self.thread_local.current_context is self.sentinel:
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current = self.set_current_context(self.parent_context)
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if current is not self:
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if current is self.sentinel:
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logger.debug("Expected logging context %s has been lost", self)
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else:
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logger.warn(
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"Current logging context %s is not expected context %s",
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self.thread_local.current_context,
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current,
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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.stop()
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self.parent_context = None
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def __getattr__(self, name):
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@ -194,17 +206,13 @@ class PreserveLoggingContext(object):
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def __enter__(self):
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"""Captures the current logging context"""
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self.current_context = LoggingContext.current_context()
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if self.new_context is not self.current_context:
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self.current_context.stop()
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LoggingContext.thread_local.current_context = self.new_context
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self.current_context = LoggingContext.set_current_context(
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self.new_context
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)
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def __exit__(self, type, value, traceback):
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"""Restores the current logging context"""
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context = LoggingContext.thread_local.current_context
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LoggingContext.thread_local.current_context = self.current_context
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if context is not self.current_context:
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self.current_context.start()
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LoggingContext.set_current_context(self.current_context)
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if self.current_context is not LoggingContext.sentinel:
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if self.current_context.parent_context is None:
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logger.warn(
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