def get_source(context, id):
"""Retrieves single source by ID."""
if id is None:
msg = _("ID cannot be None")
raise exception.InvalidSource(reason=msg)
return db.source_get(context, id)
def get_source_by_name(context, name):
"""Retrieves single source by name."""
if name is None:
msg = _("Source name cannot be None")
raise exception.InvalidSource(reason=msg)
return db.source_get_by_name(context, name)
def get_migration(ctxt, id):
"""Retrieves single source by ID."""
if id is None:
msg = _("ID cannot be None")
raise exception.InvalidSource(reason=msg)
check_policy(ctxt, 'get_migration')
return db.migration_get(ctxt, id)