Invalid token: Stateless token expired

[Fausto]

Hello there, I need some help

I am using code from a sample in the Google Data Python Library (groups_provisioning_quick_start_example.py)

adapted to add a bunch of members to a group from a Csv file

** The scenario

Basically I am using the following two Python functions from my computer: 1) for OAuth and 2) for adding members

1) def CreateGroupsClient(self):

    """Creates a groups provisioning client using OAuth2.0 flow."""

    token = gdata.gauth.OAuth2Token(

        client_id=self.client_id, client_secret=self.client_secret,

        scope=SCOPE, user_agent=USER_AGENT)

    uri = token.generate_authorize_url()

    print 'Please visit this URL to authorize the application:'

    print uri

    # Get the verification code from the standard input.

    code = raw_input('What is the verification code? ').strip()

    token.get_access_token(code)

    self.groups_client = gdata.apps.groups.client.GroupsProvisioningClient(

        domain=self.domain, auth_token=token)

2) def _AddMemberToGroupFromCsv(self):

    """Add a members to a particular group from a Csv file."""

    group_id = self._GetValidGroupId()

    newMembers = csv.reader(open('members.csv', 'rb'), delimiter=',', quotechar='|')

    print str(datetime.datetime.now())

    for idx,row in enumerate(newMembers):

        print idx+1, row[0]

        member_id = row[0]

        self.groups_client.AddMemberToGroup(group_id, member_id)

        print str(datetime.datetime.now())

** The problem:

It's working fine (too slow, probably due to Google restrictions)

However around 1 hour of running and just about 160 new members added, It would stop with the following error:

gdata.client.Unauthorized: Unauthorized - Server responded with: 401

Token invalid - Invalid token: Stateless token expired

** My question:

- how should I handle the authentication to avoid this early expiration ?

thanks in advance, Fausto