app.py 文件源码

def _validate_config_files(self):
        """
        Validates the configuration files necessary for the application. An exception is thrown
        if any of the required files are inaccessible.
        """
        # Determine the module of the derived class
        mod = self.__class__.__module__

        # If the configuration directory exists in the library, create config files as necessary
        # This check also provides backwards compatibility for projects that don't have the
        # configuration files in the library.
        if pkg_resources.resource_exists(mod, self.LIB_CONFIG_DIR):
            # Create configuration directory if not found
            if not os.access(self._config_dir, os.R_OK):
                logger.info("Configuration directory '{0}' not found, creating...".format(self._config_dir))
                os.makedirs(self._config_dir)

            # Count of current configuration files
            config_files_count = len([name for name in os.listdir(self._config_dir)
                                      if os.path.isfile(os.path.join(self._config_dir, name))])

            # Create configuration files if not found
            files = pkg_resources.resource_listdir(mod, self.LIB_APP_CONFIG_DIR)
            for f in files:
                config_path = os.path.join(self._config_dir, f)
                if not os.access(config_path, os.R_OK):
                    f_lower = f.lower()
                    # Copy configuration file. Only copy logging file if the directory was empty
                    if not(f_lower.endswith(".py") or f_lower.endswith(".pyc")) and \
                            (f_lower != Application.LOGGING_CONFIG_FILE or config_files_count == 0):
                        logger.info("Configuration file '{0}' not found, creating...".format(f))
                        shutil.copyfile(pkg_resources.resource_filename(
                            mod, self.LIB_APP_CONFIG_DIR + "/" + f), config_path)

        if not os.access(self._dxlclient_config_path, os.R_OK):
            raise Exception(
                "Unable to access client configuration file: {0}".format(
                    self._dxlclient_config_path))
        if not os.access(self._app_config_path, os.R_OK):
            raise Exception(
                "Unable to access application configuration file: {0}".format(
                    self._app_config_path))