Source code for google.appengine.api.blobstore.dict_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.
#
"""In-memory implementation of Blobstore stub storage.
This module contains an implementation of `blob_storage.BlobStorage`.
"""
import StringIO
from google.appengine.api import blobstore
from google.appengine.api.blobstore import blob_storage
[docs]class DictBlobStorage(blob_storage.BlobStorage):
"""Stores blobs in a dictionary."""
def __init__(self):
"""Constructor."""
self._blobs = {}
[docs] def StoreBlob(self, blob_key, blob_stream):
"""Stores a blob stream."""
content = StringIO.StringIO()
try:
while True:
block = blob_stream.read(1 << 20)
if not block:
break
content.write(block)
self.CreateBlob(blob_key, content.getvalue())
finally:
content.close()
[docs] def CreateBlob(self, blob_key, blob):
"""Stores a blob in a map."""
self._blobs[blobstore.BlobKey(unicode(blob_key))] = blob
[docs] def OpenBlob(self, blob_key):
"""Gets the blob contents as a stream."""
return StringIO.StringIO(
self._blobs[blobstore.BlobKey(unicode(blob_key))])
[docs] def DeleteBlob(self, blob_key):
"""Deletes blob content."""
try:
del self._blobs[blobstore.BlobKey(unicode(blob_key))]
except KeyError:
pass