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# Copyright 2011 Canonical Ltd. This software is licensed under the
# GNU Affero General Public License version 3 (see the file LICENSE).
"""Provides a context manager to run parts of a test as a different dbuser."""
__metaclass__ = type
__all__ = [
'dbuser',
'lp_dbuser',
]
from contextlib import contextmanager
from canonical.testing.layers import LaunchpadZopelessLayer
@contextmanager
def dbuser(temporary_name):
"""A context manager that temporarily changes the dbuser.
Use with the LaunchpadZopelessLayer layer and subclasses.
temporary_name is the name of the dbuser that should be in place for the
code in the "with" block.
"""
restore_name = LaunchpadZopelessLayer.txn._dbuser
LaunchpadZopelessLayer.txn.commit()
# Note that this will raise an assertion error if the
# LaunchpadZopelessLayer is not already set up.
LaunchpadZopelessLayer.switchDbUser(temporary_name)
yield
LaunchpadZopelessLayer.txn.commit()
LaunchpadZopelessLayer.switchDbUser(restore_name)
def lp_dbuser():
"""A context manager that temporarily changes to the launchpad dbuser.
Use with the LaunchpadZopelessLayer layer and subclasses.
"""
return dbuser('launchpad')
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