app/soc/logic/models/role.py
author Daniel Hans <Daniel.M.Hans@gmail.com>
Fri, 07 Aug 2009 01:27:24 +0200
changeset 2736 8f3935f0f4ba
parent 2676 a7fabd1534f8
child 3052 6907a33ca0a2
permissions -rw-r--r--
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).
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#!/usr/bin/python2.5
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#
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# Copyright 2008 the Melange authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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#   http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Role (Model) query functions.
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"""
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__authors__ = [
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  '"Sverre Rabbelier" <sverre@rabbelier.nl>',
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  '"Lennard de Rijk" <ljvderijk@gmail.com>',
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  ]
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from soc.cache import sidebar
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from soc.logic.models import base
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import soc.models.role
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DEF_LAST_RESIGN_ERROR_FMT = "This user can't be " \
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    "resigned, please make sure it's not the last %(name)s."
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ROLE_LOGICS = {}
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def registerRoleLogic(role_logic):
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  """Adds the specified Role Logic to the known ones.
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  Args:
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    role_logic: Instance of or subclass from Role Logic
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  """
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  global ROLE_LOGICS
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  name = role_logic.role_name
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  ROLE_LOGICS[name] = role_logic
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class Logic(base.Logic):
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  """Logic methods for the Role model.
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  """
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  def __init__(self, model=soc.models.role.Role,
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               base_model=None, scope_logic=None, role_name=None,
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               disallow_last_resign=False):
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    """Defines the name, key_name and model for this entity.
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    Args:
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      role_name: The name of this role used for instance for Requests
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      dissallow_last_resign: Iff True and a given role entity is the last of
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        its kind in its scope then this role can not be resigned.
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    """
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    super(Logic, self).__init__(model, base_model=base_model,
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                                scope_logic=scope_logic)
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    self.role_name = role_name
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    registerRoleLogic(self)
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    self.disallow_last_resign = disallow_last_resign
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  def getGroupEntityFromScopePath(self, group_logic, scope_path):
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    """Returns a group entity by using the given scope_path.
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    Args:
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      group_logic: logic for the group which should be retrieved
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      scope_path : the scope path of the entity
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    """
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    group_key_fields = scope_path.rsplit('/', 1)
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    if len(group_key_fields) == 1:
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      # there is only a link_id
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      fields = {'link_id' : group_key_fields[0]}
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    else:
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      # there is a scope_path and link_id
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      fields = {'scope_path' : group_key_fields[0],
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                'link_id' : group_key_fields[1]}
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    group = group_logic.getForFields(fields, unique=True)
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    return group
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  def _updateField(self, entity, entity_properties, name):
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    """Special logic for role. If status changes to active we flush the sidebar.
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    """
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    value = entity_properties[name]
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    if (name == 'status') and (entity.status != value) and value == 'active':
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      # in case the status of the role changes to active we flush the sidebar
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      # cache. Other changes will be visible after the retention time expires.
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      sidebar.flush(entity.user.account)
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    return True
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  def _onCreate(self, entity):
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    """Flush the sidebar cache when a new active role entity has been created.
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    """
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    if entity.status == 'active':
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      sidebar.flush(entity.user.account)
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    super(Logic, self)._onCreate(entity)
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  def canResign(self, entity):
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    """Checks if the current entity is allowed to be resigned.
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    Args:
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      entity: a Role entity
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    Returns:
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      - None if the entity is allowed to resign.
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      - Error message otherwise.
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    """
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    if self.disallow_last_resign:
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      # check if this is the last active role for it's scope
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      fields = {'scope': entity.scope,
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          'status': 'active'}
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      roles = self.getForFields(fields, limit=2)
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      # if this it the last one return error message
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      if len(roles) <= 1:
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        return DEF_LAST_RESIGN_ERROR_FMT
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    # resignation is possible
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    return None
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  def getRoleLogicsToNotifyUponNewRequest(self):
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    """Returns a list with subclasses of Role Logic which should be notified
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    when a new request to obtain this Role arrives.
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    Returns:
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      A list with all Role Logics to notify
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    """
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    return []
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logic = Logic()