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