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| 1 # Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 # Use of this source code is governed by a BSD-style license that can be |
| 3 # found in the LICENSE file. |
| 4 |
| 5 """Versioned singleton entity with the global configuration.""" |
| 6 |
| 7 import logging |
| 8 |
| 9 from google.appengine.api import users |
| 10 from google.appengine.ext import ndb |
| 11 |
| 12 from model.versioned_model import VersionedModel |
| 13 |
| 14 |
| 15 class VersionedConfig(VersionedModel): |
| 16 """Singleton entity with the global configuration of the service. |
| 17 |
| 18 All changes are stored in the revision log. |
| 19 """ |
| 20 |
| 21 # When this revision of configuration was created. |
| 22 updated_ts = ndb.DateTimeProperty(indexed=False, auto_now_add=True) |
| 23 |
| 24 # Who created this revision of configuration. |
| 25 updated_by = ndb.StringProperty(indexed=False) |
| 26 |
| 27 @classmethod |
| 28 def Get(cls): |
| 29 """Returns the current up-to-date version of the config entity.""" |
| 30 return cls.GetMostRecentVersion() or cls() |
| 31 |
| 32 def Update(self, **kwargs): |
| 33 """Applies |kwargs| dict to the entity and stores the entity if changed.""" |
| 34 if not users.is_current_user_admin(): |
| 35 raise Exception('Only admin could update config.') |
| 36 |
| 37 dirty = False |
| 38 for k, v in kwargs.iteritems(): |
| 39 assert k in self._properties, k |
| 40 if getattr(self, k) != v: |
| 41 setattr(self, k, v) |
| 42 dirty = True |
| 43 |
| 44 if dirty: |
| 45 user_name = users.get_current_user().email().split('@')[0] |
| 46 self.updated_by = user_name |
| 47 self.Save() |
| 48 logging.info('Config %s was updated by %s', self.__class__, user_name) |
| 49 |
| 50 return dirty |
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