"""core hooks

"""

__docformat__ = "restructuredtext en"

from datetime import timedelta, datetime

from cubicweb.server import hook

class ServerStartupHook(hook.Hook):

    """task to cleanup expirated auth cookie entities"""

    __regid__ = 'cw_cleanup_transactions'

    events = ('server_startup',)

    def __call__(self):

        # XXX use named args and inner functions to avoid referencing globals

        # which may cause reloading pb

        lifetime = timedelta(days=self.repo.config['keep-transaction-lifetime'])

        def cleanup_old_transactions(repo=self.repo, lifetime=lifetime):

            mindate = datetime.now() - lifetime

            session = repo.internal_session()

            try:

                session.system_sql(

                    'DELETE FROM transactions WHERE tx_time < %(time)s',

                    {'time': mindate})

                # cleanup deleted entities

                session.system_sql(

                    'DELETE FROM deleted_entities WHERE dtime < %(time)s',

                    {'time': mindate})

                session.commit()

            finally:

                session.close()

        self.repo.looping_task(60*60*24, cleanup_old_transactions, self.repo)