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# -*- Mode:Python; indent-tabs-mode:nil; tab-width:4; encoding:utf8 -*-
#
# Copyright 2012 Google Inc.
#
# This file is part of duplicity.
#
# Duplicity is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# Duplicity is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with duplicity; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
u"""Cache-wrapped functions for grp and pwd lookups."""
from builtins import object
import grp
import pwd
class CachedCall(object):
u"""Decorator for caching the results of function calls."""
def __init__(self, f):
self.cache = {}
self.f = f
def __call__(self, *args):
try:
return self.cache[args]
except (KeyError, TypeError) as e:
result = self.f(*args)
if not isinstance(e, TypeError):
# TypeError most likely means that args is not hashable
self.cache[args] = result
return result
@CachedCall
def getgrgid(gid):
return grp.getgrgid(gid)
@CachedCall
def getgrnam(name):
return grp.getgrnam(name)
@CachedCall
def getpwnam(name):
return pwd.getpwnam(name)
@CachedCall
def getpwuid(uid):
return pwd.getpwuid(uid)