config_manager.py 文件源码

def write(self):
        """ Writes configuration file """
        # wait for file to unlock. Timeout after 5 seconds
        for _ in range(5):
            if not self._writing:
                self._writing = True
                break
            time.sleep(1)
        else:
            _LOGGER.error('Could not write to configuration file. It is busy.')
            return

        # dump JSON to config file and unlock
        encoded = self.encode()
        json.dump(encoded, open(self._filetmp, 'w'), sort_keys=True, indent=4,
                  separators=(',', ': '))
        os.chmod(self._filetmp, stat.S_IRUSR | stat.S_IWUSR)
        try:
            shutil.move(self._filetmp, self._file)
            _LOGGER.debug('Config file succesfully updated.')
        except shutil.Error as e:
            _LOGGER.error('Failed to move temp config file to original error: ' + str(e))

        self._writing = False
        _LOGGER.debug('Wrote configuration file')