Source code for google.appengine.api.blobstore.blob_storage
#!/usr/bin/env python## Copyright 2007 Google Inc.## Licensed 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.#"""Definition of BlobStorage base class."""
[docs]classBlobStorage(object):"""Base class for defining how blobs are stored. This base class merely defines an interface that all stub blob-storage mechanisms must implement. """
[docs]defStoreBlob(self,blob_key,blob_stream):"""Store blob stream. Implement this method to persist blob data. Args: blob_key: Blob key of blob to store. blob_stream: Stream or stream-like object that will generate blob content. """raiseNotImplementedError('Storage class must override StoreBlob method.')
[docs]defOpenBlob(self,blob_key):"""Open blob for streaming. Args: blob_key: Blob-key of existing blob to open for reading. Returns: Open file stream for reading blob. Caller is responsible for closing file. """raiseNotImplementedError('Storage class must override OpenBlob method.')
[docs]defDeleteBlob(self,blob_key):"""Delete blob data from storage. Args: blob_key: Blob-key of existing blob to delete. """raiseNotImplementedError('Storage class must override DeleteBlob method.')