| # Licensed to the Apache Software Foundation (ASF) under one |
| # or more contributor license agreements. See the NOTICE file |
| # distributed with this work for additional information |
| # regarding copyright ownership. The ASF licenses this file |
| # to you under the Apache License, Version 2.0 (the |
| # "License"); you may not use this file except in compliance |
| # with the License. You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, |
| # software distributed under the License is distributed on an |
| # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| # KIND, either express or implied. See the License for the |
| # specific language governing permissions and limitations |
| # under the License. |
| |
| from typing import Any, Dict |
| |
| from .base import BackendSession, ImageBackend |
| from .file import FileBackend |
| from .nbd import NbdBackend |
| |
| __all__ = ["BackendSession", "ImageBackend", "FileBackend", "NbdBackend", "create_backend"] |
| |
| |
| def create_backend(cfg: Dict[str, Any]) -> ImageBackend: |
| """Factory: build the correct ImageBackend from a transfer config dict.""" |
| backend_type = cfg.get("backend", "nbd") |
| if backend_type == "file": |
| return FileBackend(cfg["file"]) |
| return NbdBackend( |
| cfg["socket"], |
| export=cfg.get("export"), |
| export_bitmap=cfg.get("export_bitmap"), |
| ) |
