Ejemplo n.º 1
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class Xml(ndb.Model):
    # A row in the database.
    xml_hash = ndb.IntegerProperty()
    xml_content = ndb.TextProperty()
    xml_author = ndb.TextProperty()
    xml_date = ndb.TextProperty()
    xml_desc = ndb.TextProperty()
Ejemplo n.º 2
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class ReportMetadata(Model):
  """Metadata associated with a crash report."""
  # Job type from testcase.
  job_type = ndb.StringProperty()

  # Revision of build from report.
  crash_revision = ndb.IntegerProperty(default=-1)

  # Has this report been successfully uploaded?
  is_uploaded = ndb.BooleanProperty(default=False)

  # Product.
  product = ndb.StringProperty(default='')

  # Version.
  version = ndb.TextProperty(default='')

  # Key to minidump previously written to blobstore.
  minidump_key = ndb.TextProperty(default='')

  # Processed crash bytes.
  serialized_crash_stack_frames = ndb.BlobProperty(default='', indexed=False)

  # Id of the associated testcase.
  testcase_id = ndb.StringProperty(default='')

  # Id of the associated bot.
  bot_id = ndb.TextProperty(default='')

  # Optional upload params, stored as a JSON object.
  optional_params = ndb.TextProperty(indexed=False)

  # Report id from crash/.
  crash_report_id = ndb.StringProperty()
Ejemplo n.º 3
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class SportCenter(ndb.Model):
    title = ndb.StringProperty()
    email_address = ndb.StringProperty()
    street = ndb.TextProperty()
    city = ndb.TextProperty()
    zip_number = ndb.StringProperty()
    country = ndb.TextProperty()
    created = ndb.DateTimeProperty(auto_now_add=True)
    updated = ndb.DateTimeProperty(auto_now=True)
    deleted = ndb.BooleanProperty(default=False)

    @classmethod
    def create(cls, text):
        with client.context(
        ):  # with client.context() is obligatory to use in the new ndb library
            message = cls(text=text)
            message.put()

            return message

    @classmethod
    def fetch_all(cls):
        with client.context():
            messages = cls.query().fetch()

            return messages
Ejemplo n.º 4
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class Team(ndb.Model):
    """
    Teams represent FIRST Robotics Competition teams.
    key_name is like 'frc177'
    """

    team_number = ndb.IntegerProperty(required=True)
    name = ndb.TextProperty(indexed=False)
    nickname = ndb.TextProperty(indexed=False)
    school_name = ndb.TextProperty(indexed=False)
    home_cmp = ndb.StringProperty()

    # city, state_prov, country, and postalcode are from FIRST
    city = ndb.StringProperty()  # Equivalent to locality. From FRCAPI
    state_prov = ndb.StringProperty()  # Equivalent to region. From FRCAPI
    country = ndb.StringProperty()  # From FRCAPI
    postalcode = (
        ndb.StringProperty()
    )  # From ElasticSearch only. String because it can be like "95126-1215"

    website = ndb.TextProperty(indexed=False)
    first_tpid = (ndb.IntegerProperty()
                  )  # from USFIRST. FIRST team ID number. -greg 5/20/2010
    first_tpid_year = (
        ndb.IntegerProperty()
    )  # from USFIRST. Year tpid is applicable for. -greg 9 Jan 2011
    rookie_year = ndb.IntegerProperty()
    motto = ndb.TextProperty(indexed=False)

    created = ndb.DateTimeProperty(auto_now_add=True, indexed=False)
    updated = ndb.DateTimeProperty(auto_now=True, indexed=False)
Ejemplo n.º 5
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class MastodonAuth(BaseAuth):
    """An authenticated Mastodon user.

  Provides methods that return information about this user and make OAuth-signed
  requests to the Mastodon REST API. Stores OAuth credentials in the datastore.
  See models.BaseAuth for usage details.

  Key name is the fully qualified actor address, ie @[email protected].

  Implements get() and post() but not urlopen() or api().
  """
    app = ndb.KeyProperty()
    access_token_str = ndb.TextProperty(required=True)
    user_json = ndb.TextProperty()

    def site_name(self):
        return 'Mastodon'

    def user_display_name(self):
        """Returns the user's full ActivityPub address, eg @[email protected]."""
        return self.key.id()

    def instance(self):
        """Returns the instance base URL, eg https://mastodon.social/."""
        return self.app.get().instance

    def username(self):
        """Returns the user's username, eg ryan."""
        return json_loads(self.user_json).get('username')

    def user_id(self):
        """Returns the user's id, eg 123."""
        return json_loads(self.user_json).get('id')

    def access_token(self):
        """Returns the OAuth access token string."""
        return self.access_token_str

    def get(self, *args, **kwargs):
        """Wraps requests.get() and adds instance base URL and Bearer token header."""
        url = urljoin(self.instance(), args[0])
        return self._requests_call(util.requests_get, url, *args[1:], **kwargs)

    def post(self, *args, **kwargs):
        """Wraps requests.post() and adds the Bearer token header."""
        return self._requests_call(util.requests_post, *args, **kwargs)

    def _requests_call(self, fn, *args, **kwargs):
        headers = kwargs.setdefault('headers', {})
        headers['Authorization'] = 'Bearer ' + self.access_token_str

        resp = fn(*args, **kwargs)
        try:
            resp.raise_for_status()
        except BaseException as e:
            util.interpret_http_exception(e)
            raise
        return resp
Ejemplo n.º 6
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class MastodonApp(ndb.Model):
    """A Mastodon API OAuth2 app registered with a specific instance."""
    instance = ndb.StringProperty(
        required=True)  # URL, eg https://mastodon.social/
    data = ndb.TextProperty(required=True)  # JSON; includes client id/secret
    instance_info = ndb.TextProperty()  # JSON; from /api/v1/instance
    app_url = ndb.StringProperty()
    app_name = ndb.StringProperty()
    created_at = ndb.DateTimeProperty(auto_now_add=True, required=True)
Ejemplo n.º 7
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class TestcaseUploadMetadata(Model):
    """Metadata associated with a user uploaded test case."""
    # Timestamp.
    timestamp = ndb.DateTimeProperty()

    # Testcase filename.
    filename = ndb.StringProperty()

    # Current status of the testcase.
    status = ndb.StringProperty()

    # Uploader email address.
    uploader_email = ndb.StringProperty()

    # Name of the bot that ran analyze on this testcase.
    bot_name = ndb.StringProperty()

    # Id of the associated testcase.
    testcase_id = ndb.IntegerProperty()

    # Id of the testcase that this is marked as a duplicate of.
    duplicate_of = ndb.IntegerProperty()

    # Blobstore key for the testcase associated with this object.
    blobstore_key = ndb.StringProperty()

    # Testcase timeout.
    timeout = ndb.IntegerProperty()

    # Is this a single testcase bundled in an archive?
    bundled = ndb.BooleanProperty()

    # Path to the file in the archive.
    path_in_archive = ndb.TextProperty()

    # Original blobstore key for this object (used for archives).
    original_blobstore_key = ndb.StringProperty()

    # Security flag.
    security_flag = ndb.BooleanProperty(default=False)

    # Number of retries for this testcase.
    retries = ndb.IntegerProperty()

    # Flag to indicate where bug title should be updated or not.
    bug_summary_update_flag = ndb.BooleanProperty()

    # Flag to indicate if we are running in quiet mode (e.g. bug updates).
    quiet_flag = ndb.BooleanProperty()

    # Additional testcase metadata dict stored as a string.
    additional_metadata_string = ndb.TextProperty(indexed=False)

    # Specified issue id.
    bug_information = ndb.StringProperty()
Ejemplo n.º 8
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class Activity(StringIdModel):
  """An activity with responses to be propagated.

  The key name is the activity id as a tag URI.

  Currently only used for posts sent to us by the browser extension.
  """
  source = ndb.KeyProperty()
  created = ndb.DateTimeProperty(auto_now_add=True, tzinfo=timezone.utc)
  updated = ndb.DateTimeProperty(auto_now=True, tzinfo=timezone.utc)
  activity_json = ndb.TextProperty()
  html = ndb.TextProperty()
Ejemplo n.º 9
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class LoveLink(ndb.Model):
    """Models an instance of a Love Link."""
    hash_key = ndb.StringProperty()
    message = ndb.TextProperty()
    recipient_list = ndb.TextProperty()
    timestamp = ndb.DateTimeProperty(auto_now_add=True)

    @property
    def seconds_since_epoch(self):
        return int(mktime(self.timestamp.timetuple()))

    @property
    def url(self):
        return config.APP_BASE_URL + 'l/' + self.hash_key
Ejemplo n.º 10
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class Feed(models.StringIdModel):
    """An HTML feed uploaded by the browser extension, converted to AS1.

  Key is token generated by browser extension.
  """
    html = ndb.TextProperty(required=True)
    actor_json = ndb.StringProperty()
    as1_json = ndb.TextProperty(required=True)
    created = ndb.DateTimeProperty(auto_now_add=True,
                                   required=True,
                                   tzinfo=timezone.utc)
    updated = ndb.DateTimeProperty(auto_now=True,
                                   required=True,
                                   tzinfo=timezone.utc)
Ejemplo n.º 11
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class MediumAuth(BaseAuth):
    """An authenticated Medium user.

  Provides methods that return information about this user and make OAuth-signed
  requests to the Medium REST API. Stores OAuth credentials in the datastore.
  See models.BaseAuth for usage details.

  Medium-specific details: implements get() but not urlopen() or api().
  The key name is the user id (*not* username).
  """
    access_token_str = ndb.StringProperty(required=True)
    user_json = ndb.TextProperty()
    # used by bridgy in
    # https://github.com/snarfed/bridgy/commit/58cce60790e746d300e7e5dac331543c56bd9108
    # background: https://github.com/snarfed/bridgy/issues/506
    publications_json = ndb.TextProperty()

    def site_name(self):
        return 'Medium'

    def user_display_name(self):
        """Returns the user's full name or username.
    """
        if self.user_json:
            data = json_loads(self.user_json).get('data')
            if data:
                return data.get('name') or data.get('username')

        return self.key_id()

    def access_token(self):
        """Returns the OAuth access token string.
    """
        return self.access_token_str

    def get(self, *args, **kwargs):
        """Wraps requests.get() and adds the Bearer token header.
    """
        headers = kwargs.setdefault('headers', {})
        headers['Authorization'] = 'Bearer ' + self.access_token_str
        headers.setdefault('User-Agent', USER_AGENT)

        resp = util.requests_get(*args, **kwargs)
        try:
            resp.raise_for_status()
        except BaseException as e:
            util.interpret_http_exception(e)
            raise
        return resp
Ejemplo n.º 12
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class BloggerV2Auth(models.BaseAuth):
  """An authenticated Blogger user.

  Provides methods that return information about this user (or page) and make
  OAuth-signed requests to the Blogger API. Stores OAuth credentials in the
  datastore. See models.BaseAuth for usage details.

  Blogger-specific details: implements api() but not urlopen(). api() returns a
  :class:`gdata.blogger.client.BloggerClient`. The datastore entity key name is
  the Blogger user id.
  """
  name = ndb.StringProperty(required=True)
  creds_json = ndb.TextProperty(required=True)
  user_atom = ndb.TextProperty(required=True)
  blogs_atom = ndb.TextProperty(required=True)
  picture_url = ndb.TextProperty(required=True)

  # the elements in both of these lists match
  blog_ids = ndb.StringProperty(repeated=True)
  blog_titles = ndb.StringProperty(repeated=True)
  blog_hostnames = ndb.StringProperty(repeated=True)

  def site_name(self):
    return 'Blogger'

  def user_display_name(self):
    """Returns the user's Blogger username.
    """
    return self.name

  def access_token(self):
    """Returns the OAuth access token string.
    """
    return json_loads(self.creds_json)['access_token']

  def _api(self):
    """Returns a gdata.blogger.client.BloggerClient.
    """
    return BloggerClient(auth_token=self)

  def modify_request(self, http_request):
    """Makes this class usable as an auth_token object in a gdata Client.

    Background in :class:`gdata.client.GDClient` and
    :meth:`gdata.client.GDClient.request`. Other similar classes include
    :class:`gdata.gauth.ClientLoginToken` and :class:`gdata.gauth.AuthSubToken`.
    """
    http_request.headers['Authorization'] = 'Bearer %s' % self.access_token()
Ejemplo n.º 13
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class Follower(StringIdModel):
    """A follower of a Bridgy Fed user.

    Key name is 'USER_DOMAIN FOLLOWER_ID', e.g.:
      'snarfed.org https://mastodon.social/@swentel'.
    """
    STATUSES = ('active', 'inactive')

    # most recent AP Follow activity (JSON). must have a composite actor object
    # with an inbox, publicInbox, or sharedInbox!
    last_follow = ndb.TextProperty()
    status = ndb.StringProperty(choices=STATUSES, default='active')

    created = ndb.DateTimeProperty(auto_now_add=True)
    updated = ndb.DateTimeProperty(auto_now=True)

    @classmethod
    def _id(cls, user_domain, follower_id):
        assert user_domain
        assert follower_id
        return '%s %s' % (user_domain, follower_id)

    @classmethod
    def get_or_create(cls, user_domain, follower_id, **kwargs):
        logging.info('new Follower for %s %s', user_domain, follower_id)
        return cls.get_or_insert(cls._id(user_domain, follower_id), **kwargs)
Ejemplo n.º 14
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class DisqusAuth(models.BaseAuth):
    """An authenticated Disqus user.

  Provides methods that return information about this user (or page)
  and make OAuth-signed requests to Instagram's HTTP-based
  APIs. Stores OAuth credentials in the datastore. See models.BaseAuth
  for usage details.

  Disqus-specific details: implements urlopen() but not api().
  The key name is the Disqus user id.
  """
    auth_code = ndb.StringProperty(required=True)
    access_token_str = ndb.StringProperty(required=True)
    user_json = ndb.TextProperty(required=True)

    def site_name(self):
        return 'Disqus'

    def user_display_name(self):
        """Returns the user's name.
    """
        return json_loads(self.user_json)['name']

    def access_token(self):
        """Returns the OAuth access token string.
    """
        return self.access_token_str

    def urlopen(self, url, **kwargs):
        """Wraps urlopen() and adds OAuth credentials to the request.
    """
        # TODO does work for POST requests? key is always passed as a
        # query param, regardless of method.
        return models.BaseAuth.urlopen_access_token(url, self.access_token_str,
                                                    DISQUS_CLIENT_ID, **kwargs)
Ejemplo n.º 15
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class House(ndb.Model):
    address = ndb.StringProperty()
    json_property = ndb.JsonProperty()
    indexed_int = ndb.IntegerProperty()
    unindexed_int = ndb.IntegerProperty(indexed=False)
    text_property = ndb.TextProperty()
    datetime_property = ndb.DateTimeProperty()
Ejemplo n.º 16
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class SessionModel(ndb.Model):
    created_on = ndb.DateTimeProperty(auto_now_add=True, indexed=False)
    updated_on = ndb.DateTimeProperty(auto_now=True, indexed=False)
    expires_on = ndb.DateTimeProperty(indexed=True)
    data = ndb.TextProperty(indexed=False)

    def delete(self):
        self.key.delete()

    @classmethod
    def delete_by_id(cls, sid):
        ndb.Key(cls, sid).delete()

    def has_expired(self):
        return self.expires_on and self.expires_on <= datetime.utcnow()

    def should_slide_expiry(self):
        if not self.expires_on or not self.updated_on:
            return False

        # Use a precision of 5 minutes
        return (datetime.utcnow() - self.updated_on).total_seconds() > 300

    def get_data(self):
        return json.loads(want_bytes(self.data))

    def set_data(self, data):
        self.data = json.dumps(dict(data))
Ejemplo n.º 17
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class InstagramAuth(models.BaseAuth):
    """An authenticated Instagram user or page.

  Provides methods that return information about this user (or page) and make
  OAuth-signed requests to Instagram's HTTP-based APIs. Stores OAuth credentials
  in the datastore. See models.BaseAuth for usage details.

  Instagram-specific details: implements urlopen() but not api(). The key name
  is the Instagram username.
  """
    auth_code = ndb.StringProperty(required=True)
    access_token_str = ndb.StringProperty(required=True)
    user_json = ndb.TextProperty(required=True)

    def site_name(self):
        return 'Instagram'

    def user_display_name(self):
        """Returns the Instagram username.
    """
        return self.key_id()

    def access_token(self):
        """Returns the OAuth access token string.
    """
        return self.access_token_str

    def urlopen(self, url, **kwargs):
        """Wraps urlopen() and adds OAuth credentials to the request.
    """
        return models.BaseAuth.urlopen_access_token(url, self.access_token_str,
                                                    **kwargs)
Ejemplo n.º 18
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class Publish(ndb.Model):
  """A comment, like, repost, or RSVP published into a silo.

  Child of a :class:`PublishedPage` entity.
  """
  STATUSES = ('new', 'complete', 'failed', 'deleted')

  # Turn off instance and memcache caching. See Source for details.
  _use_cache = False
  _use_memcache = False

  type = ndb.StringProperty(choices=PUBLISH_TYPES)
  status = ndb.StringProperty(choices=STATUSES, default='new')
  source = ndb.KeyProperty()
  html = ndb.TextProperty()  # raw HTML fetched from source
  published = ndb.JsonProperty(compressed=True)
  created = ndb.DateTimeProperty(auto_now_add=True)
  updated = ndb.DateTimeProperty(auto_now=True)

  def type_label(self):
    """Returns silo-specific string type, e.g. 'favorite' instead of 'like'."""
    for cls in sources.values():  # global
      if cls.__name__ == self.source.kind():
        return cls.TYPE_LABELS.get(self.type, self.type)

    return self.type
Ejemplo n.º 19
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class MeetupAuth(BaseAuth):
    """An authenticated Meetup.com user.

    Provides methods that return information about this user and make
    OAuth-signed requests to Meetup's HTTP-based APIs. Stores OAuth credentials
    in the datastore. See models.BaseAuth for usage details.

    Implements urlopen() but not http() or api().
    """
    access_token_str = ndb.StringProperty(required=True)
    user_json = ndb.TextProperty(required=True)

    def site_name(self):
        return 'Meetup.com'

    def user_display_name(self):
        """Returns the Meetup.com user id.
        """
        return json_loads(self.user_json)['name']

    def access_token(self):
        """Returns the OAuth access token string.
        """
        return self.access_token_str

    def urlopen(self, url, **kwargs):
        return urlopen_bearer_token(url, self.access_token_str, kwargs)
Ejemplo n.º 20
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class Note(ndb.Model):
    #     """NDB model class for a user's note.

    #     Key is user id from decrypted token.
    #     """
    friendly_id = ndb.StringProperty()
    message = ndb.TextProperty()
    created = ndb.DateTimeProperty(auto_now_add=True)
Ejemplo n.º 21
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class Program(ndb.Model):
    """A single program"""
    # Parent is a Folder
    # key is the program's name (unique for a folder)
    description = ndb.StringProperty()
    source = ndb.TextProperty()
    screenshot = ndb.BlobProperty()
    datetime = ndb.DateTimeProperty()  # this is UTC date and time
Ejemplo n.º 22
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class Trial(Model):
  """Trials for specific binaries."""
  # App name that this trial is applied to. E.g. "d8" or "chrome".
  app_name = ndb.StringProperty()

  # Chance to select this set of arguments. Zero to one.
  probability = ndb.FloatProperty()

  # Additional arguments to apply if selected.
  app_args = ndb.TextProperty()
Ejemplo n.º 23
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class Love(ndb.Model):
    """Models an instance of sent love."""
    message = ndb.TextProperty()
    recipient_key = ndb.KeyProperty(kind=Employee)
    secret = ndb.BooleanProperty(default=False)
    sender_key = ndb.KeyProperty(kind=Employee)
    timestamp = ndb.DateTimeProperty(auto_now_add=True)

    @property
    def seconds_since_epoch(self):
        return int(mktime(self.timestamp.timetuple()))
Ejemplo n.º 24
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class GitHubAuth(BaseAuth):
    """An authenticated GitHub user.

  Provides methods that return information about this user and make OAuth-signed
  requests to the GitHub REST API. Stores OAuth credentials in the datastore.
  See models.BaseAuth for usage details.

  GitHub-specific details: implements get() but not urlopen(), or api().
  The key name is the username.
  """
    access_token_str = ndb.StringProperty(required=True)
    user_json = ndb.TextProperty()

    def site_name(self):
        return 'GitHub'

    def user_display_name(self):
        """Returns the user's full name or username.
    """
        return self.key_id()

    def access_token(self):
        """Returns the OAuth access token string.
    """
        return self.access_token_str

    def get(self, *args, **kwargs):
        """Wraps requests.get() and adds the Bearer token header.

    TODO: unify with medium.py.
    """
        return self._requests_call(util.requests_get, *args, **kwargs)

    def post(self, *args, **kwargs):
        """Wraps requests.post() and adds the Bearer token header.

    TODO: unify with medium.py.
    """
        return self._requests_call(util.requests_post, *args, **kwargs)

    def _requests_call(self, fn, *args, **kwargs):
        headers = kwargs.setdefault('headers', {})
        headers['Authorization'] = 'Bearer ' + self.access_token_str

        resp = fn(*args, **kwargs)
        assert 'errors' not in resp, resp

        try:
            resp.raise_for_status()
        except BaseException as e:
            util.interpret_http_exception(e)
            raise
        return resp
Ejemplo n.º 25
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class AffectedPackage(ndb.Model):
    """Affected packages."""
    # The affected package identifier.
    package = ndb.StructuredProperty(Package)
    # The list of affected ranges.
    ranges = ndb.LocalStructuredProperty(AffectedRange2, repeated=True)
    # The list of explicit affected versions.
    versions = ndb.TextProperty(repeated=True)
    # Database specific metadata.
    database_specific = ndb.JsonProperty()
    # Ecosystem specific metadata.
    ecosystem_specific = ndb.JsonProperty()
Ejemplo n.º 26
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class GoogleUser(models.BaseAuth):
    """An authenticated Google user.

  Provides methods that return information about this user and make OAuth-signed
  requests to Google APIs. Stores OAuth credentials in the datastore. See
  models.BaseAuth for usage details.

  To make Google API calls: https://google-auth.readthedocs.io/
  """
    user_json = ndb.TextProperty()
    token_json = ndb.TextProperty()

    def site_name(self):
        return 'Google'

    def user_display_name(self):
        """Returns the user's name."""
        return json_loads(self.user_json).get('name') or 'unknown'

    def access_token(self):
        """Returns the OAuth access token string."""
        return json_loads(self.token_json)['access_token']
Ejemplo n.º 27
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class Tune(ndb.Model):
    id_tune = ndb.IntegerProperty()
    ref_tune = ndb.StringProperty()
    titre = ndb.StringProperty()  # name of the tune
    auteur = ndb.StringProperty()
    youtubelink = ndb.StringProperty()
    text_ly = ndb.TextProperty()
    chords = ndb.TextProperty()
    image_file = ndb.StringProperty()
    pdf_file = ndb.StringProperty()
    id_rythme = ndb.IntegerProperty()
    lastChanged = ndb.DateTimeProperty(auto_now=True)

    @classmethod
    def getAll(cls):
        cache_tunes = redis_client.get("tunes")
        if cache_tunes:
            b_tunes = json.loads(cache_tunes)
        else:
            b_tunes = cls.query()
            redis_client.set("tunes", json.dumps(b_tunes))
        return b_tunes
Ejemplo n.º 28
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Archivo: models.py Proyecto: google/osv
class FixResult(ndb.Model):
    """Fix results."""
    # The commit hash.
    commit = ndb.StringProperty(default='')
    # Vulnerability summary.
    summary = ndb.TextProperty()
    # Vulnerability details.
    details = ndb.TextProperty()
    # Error (if any).
    error = ndb.StringProperty()
    # OSS-Fuzz issue ID.
    issue_id = ndb.StringProperty()
    # Project for the bug.
    project = ndb.StringProperty()
    # Package ecosystem for the project.
    ecosystem = ndb.StringProperty()
    # Repo URL.
    repo_url = ndb.StringProperty()
    # Severity of the bug.
    severity = ndb.StringProperty(validator=_check_valid_severity)
    # Reference URLs.
    reference_urls = ndb.StringProperty(repeated=True)
    # Source timestamp.
    timestamp = ndb.DateTimeProperty()
Ejemplo n.º 29
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class AccessKey(ndb.Model):
    """Models an instance of an API key."""
    access_key = ndb.StringProperty()
    description = ndb.TextProperty()

    @staticmethod
    def generate_uuid():
        return uuid4().hex

    @classmethod
    def create(cls, description):
        new_key = cls()
        new_key.access_key = cls.generate_uuid()
        new_key.description = description
        new_key.put()

        return new_key
Ejemplo n.º 30
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class CachedPage(StringIdModel):
  """Cached HTML for pages that changes rarely. Key id is path.

  Stored in the datastore since datastore entities in memcache (mostly
  :class:`models.Response`) are requested way more often, so it would get
  evicted out of memcache easily.

  Keys, useful for deleting from memcache:
  /: aglzfmJyaWQtZ3lyEQsSCkNhY2hlZFBhZ2UiAS8M
  /users: aglzfmJyaWQtZ3lyFgsSCkNhY2hlZFBhZ2UiBi91c2Vycww
  """
  html = ndb.TextProperty()
  expires = ndb.DateTimeProperty()

  @classmethod
  def load(cls, path):
    cached = CachedPage.get_by_id(path)
    if cached:
      if cached.expires and now_fn() > cached.expires:
        logging.info('Deleting expired cached page for %s', path)
        cached.key.delete()
        return None
      else:
        logging.info('Found cached page for %s', path)
    return cached

  @classmethod
  def store(cls, path, html, expires=None):
    """Stores new page contents.

    Args:
      path: string
      html: string
      expires: :class:`datetime.timedelta`
    """
    logging.info('Storing new page in cache for %s', path)
    if expires is not None:
      logging.info('  (expires in %s)', expires)
      expires = now_fn() + expires
    CachedPage(id=path, html=html, expires=expires).put()

  @classmethod
  def invalidate(cls, path):
    logging.info('Deleting cached page for %s', path)
    CachedPage(id=path).key.delete()