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@@ -0,0 +1,85 @@
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+from functools import wraps
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+
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+import threading
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+import logging
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+
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+class LoggingContext(object):
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+ __slots__ = ["parent_context", "name", "__dict__"]
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+
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+ thread_local = threading.local()
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+
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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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+
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+ sentinel = Sentinel()
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+
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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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+
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+ def __str__(self):
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+ return "%s@%x" % (self.name, id(self))
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+
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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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+
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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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+
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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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+
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+ def __getattr__(self, name):
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+ return getattr(self.parent_context, name)
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+
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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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+
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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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+
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+
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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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+
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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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+
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+
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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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+
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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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+
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+
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