def create_policy(name, source=None, schedule_src=None, condition_srcs=None,
apply_src=None, enabled=True):
""" Creates a new policy model object to the database. If it doesn't
compile, an exception will be thrown.
"""
assert isinstance(name, basestring) # TODO: make this an exception
source = policy.combine_sources(source, schedule_src, condition_srcs,
apply_src)
# The following method should throw an exception if it fails, so the
# following 'raise' statement should never get called. It is here for
# explanatory purposes.
if not policy.check_source(source):
msg = 'Invariant error: policy.check_source() returned False.'
raise RuntimeError(msg)
model = PolicyModel(name=name, source=source, enabled=enabled)
model.modified = datetime.datetime.now()
model.save()
return model
