def open_mem_map()

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

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

    def open_mem_map(
            self,
            mem_map_name: str,
            mem_map_size: int,
            access: int = mmap.ACCESS_READ) -> Optional[mmap.mmap]:
        """
        Note: mem_map_size = 0 means open the entire mmap.
        Note: On Windows, an mmap is created if one does not exist even when
              attempting to open it.
        """
        if mem_map_name is None or mem_map_name == '':
            raise SharedMemoryException(
                f'Cannot open memory map. Invalid name {mem_map_name}')
        if mem_map_size < 0:
            raise SharedMemoryException(
                f'Cannot open memory map. Invalid size {mem_map_size}')
        try:
            mem_map = mmap.mmap(-1, mem_map_size, mem_map_name, access=access)
            return mem_map
        except Exception as e:
            logger.warning(
                'Cannot open memory map %s with size %s - %s', mem_map_name,
                mem_map_size, e)
            return None