utils.py 文件源码

def wrapping(wrapped):
  # A decorator to decorate a decorator's wrapper.  Following the lead
  # of Twisted and Monocle, this is supposed to make debugging heavily
  # decorated code easier.  We'll see...
  # TODO(pcostello): This copies the functionality of functools.wraps
  # following the patch in http://bugs.python.org/issue3445. We can replace
  # this once upgrading to python 3.3.
  def wrapping_wrapper(wrapper):
    try:
      wrapper.__wrapped__ = wrapped
      wrapper.__name__ = wrapped.__name__
      wrapper.__doc__ = wrapped.__doc__
      wrapper.__dict__.update(wrapped.__dict__)
      # Local functions won't have __module__ attribute.
      if hasattr(wrapped, '__module__'):
        wrapper.__module__ = wrapped.__module__
    except Exception:
      pass
    return wrapper
  return wrapping_wrapper


# Define a base class for classes that need to be thread-local.
# This is pretty subtle; we want to use threading.local if threading
# is supported, but object if it is not.