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1 # 2 # 3 4 # Copyright (C) 2014 Google Inc. 5 # All rights reserved. 6 # 7 # Redistribution and use in source and binary forms, with or without 8 # modification, are permitted provided that the following conditions are 9 # met: 10 # 11 # 1. Redistributions of source code must retain the above copyright notice, 12 # this list of conditions and the following disclaimer. 13 # 14 # 2. Redistributions in binary form must reproduce the above copyright 15 # notice, this list of conditions and the following disclaimer in the 16 # documentation and/or other materials provided with the distribution. 17 # 18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 19 # IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20 # TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21 # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 22 # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 23 # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 24 # PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 25 # PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 26 # LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 27 # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 28 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 30 31 """Utilities used by the config module.""" 32 33 34 import logging 35 3638 """Configuration synchronization decorator. 39 40 """ 41 def wrap(fn): 42 def sync_function(*args, **kwargs): 43 with args[0].GetConfigManager(shared): 44 return fn(*args, **kwargs)45 return sync_function 46 return wrap 47 4850 """Locks the configuration and exposes it to be read or modified. 51 52 """8154 assert hasattr(config_writer, '_ConfigData'), \ 55 "invalid argument: Not a ConfigWriter" 56 self._config_writer = config_writer 57 self._shared = shared 58 self._forcelock = forcelock5961 try: 62 self._config_writer._OpenConfig(# pylint: disable=W0212 63 self._shared, 64 force=self._forcelock) 65 except Exception: 66 logging.debug("Opening configuration failed") 67 try: 68 self._config_writer._CloseConfig(False) # pylint: disable=W0212 69 except Exception: # pylint: disable=W0703 70 logging.debug("Closing configuration failed as well") 71 raise7274 # save the configuration, if this was a write opreration that succeeded 75 if exc_type is not None: 76 logging.debug("Configuration operation failed," 77 " the changes will not be saved") 78 # pylint: disable=W0212 79 self._config_writer._CloseConfig(not self._shared and exc_type is None) 80 return False
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