Argument store added to updateEntityProperties.
This argument determines if an entity should be stored in the data model after its properties are updated.
It may be useful, for example, along with tasks (Task Queue API). One may want to make some modifications to an entity during execution of a task, but the developer is sure that at least one new task, which also wants to modify the entity, will be queued, so he or she can just update the entity without saving the changes to the data model, set the entity in memcache and the following task (which is to be executed very shortly) is to retrive the current entity from the memcache (without any expensive calls to the actual data model).
#!/usr/bin/python2.5
#
# Copyright 2008 the Melange authors.
#
# 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.
"""Common validation helper functions.
"""
__authors__ = [
'"Lennard de Rijk" <ljvderijk@gmail.com>',
'"Pawel Solyga" <pawel.solyga@gmail.com>',
]
import feedparser
from google.appengine.api import urlfetch
from google.appengine.api import urlfetch_errors
from soc.models import linkable
def isFeedURLValid(feed_url=None):
"""Returns True if provided url is valid ATOM or RSS.
Args:
feed_url: ATOM or RSS feed url
"""
# a missing or empty feed url is never valid
if not feed_url:
return False
try:
result = urlfetch.fetch(feed_url)
except urlfetch_errors.Error:
return False
# 200 is the status code for 'all ok'
if result.status_code != 200:
return False
parsed_feed = feedparser.parse(result.content)
# version is always present if the feed is valid
if not parsed_feed.version:
return False
# TODO: isn't this check redunant?
if parsed_feed.version == '':
return False
return True
def isLinkIdFormatValid(link_id):
"""Returns True if link_id is in a valid format.
Args:
link_id: link ID used in URLs for identification
"""
if linkable.LINK_ID_REGEX.match(link_id):
return True
return False
def isScopePathFormatValid(scope_path):
"""Returns True if scope_path is in a valid format.
Args:
scope_path: scope path prepended to link ID
used for identification.
"""
if linkable.SCOPE_PATH_REGEX.match(scope_path):
return True
return False