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filecache: use try-except for faster __dict__ lookup...

filecache: use try-except for faster __dict__ lookup Python function call is slow, and the cost could be significant here. $ hg perfrevset 'branch(tip)' -R mercurial (orig) wall 0.139511 comb 0.140000 user 0.140000 sys 0.000000 (best of 66) (this) wall 0.114195 comb 0.110000 user 0.110000 sys 0.000000 (best of 81)

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      # interfaceutil.py - Utilities for declaring interfaces.

      #

      # Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com>

      #

      # This software may be used and distributed according to the terms of the

      # GNU General Public License version 2 or any later version.

      # zope.interface imposes a run-time cost due to module import overhead and

      # bookkeeping for declaring interfaces. So, we use stubs for various

      # zope.interface primitives unless instructed otherwise.

      from __future__ import absolute_import

      from .. import (

          encoding,

      )

      if encoding.environ.get('HGREALINTERFACES'):

          from ..thirdparty.zope import (

              interface as zi,

          )

          Attribute = zi.Attribute

          Interface = zi.Interface

          implementer = zi.implementer

      else:

          class Attribute(object):

              def __init__(self, __name__, __doc__=''):

                  pass

          class Interface(object):

              def __init__(self, name, bases=(), attrs=None, __doc__=None,

                       __module__=None):

                  pass

          def implementer(*ifaces):

              def wrapper(cls):

                  return cls

              return wrapper

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				# interfaceutil.py - Utilities for declaring interfaces.
				#
				# Copyright 2018 Gregory Szorc <gregory.szorc@gmail.com>
				#
				# This software may be used and distributed according to the terms of the
				# GNU General Public License version 2 or any later version.

				# zope.interface imposes a run-time cost due to module import overhead and
				# bookkeeping for declaring interfaces. So, we use stubs for various
				# zope.interface primitives unless instructed otherwise.

				from __future__ import absolute_import

				from .. import (
				encoding,
				)

				if encoding.environ.get('HGREALINTERFACES'):
				from ..thirdparty.zope import (
				interface as zi,
				)

				Attribute = zi.Attribute
				Interface = zi.Interface
				implementer = zi.implementer
				else:
				class Attribute(object):
				def __init__(self, __name__, __doc__=''):
				pass

				class Interface(object):
				def __init__(self, name, bases=(), attrs=None, __doc__=None,
				__module__=None):
				pass

				def implementer(*ifaces):
				def wrapper(cls):
				return cls

				return wrapper