#!/usr/bin/python2.5

#

# Copyright 2009 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.

"""Module contains sidebar memcaching functions.

"""

__authors__ = [

    '"Sverre Rabbelier" <sverre@rabbelier.nl>',

  ]

from google.appengine.api import memcache

from google.appengine.api import users

import soc.cache.base

import soc.cache.rights

def key(id):

  """Returns the memcache key for the user's sidebar.

  """

  return 'sidebar_for_%s' % repr(id)

def get(id, user):

  """Retrieves the sidebar for the specified user from the memcache.

  """

  memcache_key = key(id)

  return memcache.get(memcache_key), memcache_key

def put(sidebar, memcache_key, id, user):

  """Sets the sidebar for the specified user in the memcache.

  Args:

    sidebar: the sidebar to be cached

  """

  # Store sidebar for just three minutes to force a refresh every so often

  retention = 3*60

  memcache.add(memcache_key, sidebar, retention)

def flush(id=None):

  """Removes the sidebar for the current user from the memcache.

  Also calls soc.cache.rights.flush for the specified user.

  Args:

    id: defaults to the current account if not set

  """

  if not id:

    id = users.get_current_user()

  memcache_key = key(id)

  memcache.delete(memcache_key)

  soc.cache.rights.flush(id)

# define the cache function

cache = soc.cache.base.getCacher(get, put)