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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:
Mark Haines 2015-12-07 11:00:12 +00:00
parent 07d18dcab1 3dd1630848
commit a190b2e85e
1 changed files with 24 additions and 16 deletions
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40
synapse/util/logcontext.py
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@ -87,13 +87,26 @@ class LoggingContext(object):
"""Get the current logging context from thread local storage"""
return getattr(cls.thread_local, "current_context", cls.sentinel)
@classmethod
def set_current_context(cls, context):
"""Set the current logging context in thread local storage
Args:
context(LoggingContext): The context to activate.
Returns:
The context that was previously active
"""
current = cls.current_context()
if current is not context:
current.stop()
cls.thread_local.current_context = context
context.start()
return current
def __enter__(self):
"""Enters this logging context into thread local storage"""
if self.parent_context is not None:
raise Exception("Attempt to enter logging context multiple times")
self.parent_context = self.current_context()
self.thread_local.current_context = self
self.start()
self.parent_context = self.set_current_context(self)
return self
def __exit__(self, type, value, traceback):
@ -102,17 +115,16 @@ class LoggingContext(object):
Returns:
None to avoid suppressing any exeptions that were thrown.
"""
if self.thread_local.current_context is not self:
if self.thread_local.current_context is self.sentinel:
current = self.set_current_context(self.parent_context)
if current is not self:
if current is self.sentinel:
logger.debug("Expected logging context %s has been lost", self)
else:
logger.warn(
"Current logging context %s is not expected context %s",
self.thread_local.current_context,
current,
self
)
self.thread_local.current_context = self.parent_context
self.stop()
self.parent_context = None
def __getattr__(self, name):
@ -194,17 +206,13 @@ class PreserveLoggingContext(object):
def __enter__(self):
"""Captures the current logging context"""
self.current_context = LoggingContext.current_context()
if self.new_context is not self.current_context:
self.current_context.stop()
LoggingContext.thread_local.current_context = self.new_context
self.current_context = LoggingContext.set_current_context(
self.new_context
)
def __exit__(self, type, value, traceback):
"""Restores the current logging context"""
context = LoggingContext.thread_local.current_context
LoggingContext.thread_local.current_context = self.current_context
if context is not self.current_context:
self.current_context.start()
LoggingContext.set_current_context(self.current_context)
if self.current_context is not LoggingContext.sentinel:
if self.current_context.parent_context is None:
logger.warn(