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# -*- Mode:Python; indent-tabs-mode:nil; tab-width:4 -*- # # 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)
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