def create_mem_map()

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

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

    def create_mem_map(self, mem_map_name: str, mem_map_size: int) \
            -> Optional[mmap.mmap]:
        if mem_map_name is None or mem_map_name == '':
            raise SharedMemoryException(
                f'Cannot create memory map. Invalid name {mem_map_name}')
        if mem_map_size <= 0:
            raise SharedMemoryException(
                f'Cannot create memory map. Invalid size {mem_map_size}')
        file = self._create_mem_map_file(mem_map_name, mem_map_size)
        if file is None:
            logger.warning('Cannot create file: %s', mem_map_name)
            return None
        mem_map = mmap.mmap(file.fileno(), mem_map_size, mmap.MAP_SHARED,
                            mmap.PROT_WRITE)
        if self._is_mem_map_initialized(mem_map):
            raise SharedMemoryException(f'Memory map {mem_map_name} '
                                        'already exists')
        self._set_mem_map_initialized(mem_map)
        return mem_map