def _open_mem_map_file()

in azure_functions_worker/bindings/shared_memory_data_transfer/file_accessor_unix.py [0:0]

• 15 lines of code
• 5 McCabe index (conditional complexity)

    def _open_mem_map_file(self, mem_map_name: str) -> Optional[BufferedRandom]:
        """
        Get the file descriptor of an existing memory map.
        Returns the BufferedRandom stream to the file.
        """
        # Iterate over all the possible directories where the memory map could
        # be present and try to open it.
        for temp_dir in self.valid_dirs:
            file_path = os.path.join(temp_dir, mem_map_name)
            if os.path.exists(file_path):
                try:
                    fd = open(file_path, 'r+b')
                    return fd
                except Exception as e:
                    logger.error('Cannot open file %s - %s', file_path, e,
                                 exc_info=True)
        # The memory map was not found in any of the known directories
        logger.error(
            'Cannot open memory map %s in any of the following directories: '
            '%s',
            mem_map_name, self.valid_dirs)
        return None