Source code for heat.engine.constraint.heat_constraints

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#         http://www.apache.org/licenses/LICENSE-2.0
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import collections

import six

from heat.common.i18n import _
from heat.engine import constraints


[docs]class ResourceTypeConstraint(constraints.BaseCustomConstraint):
[docs] def validate(self, value, context, template=None): if not isinstance(value, collections.Sequence): return False if isinstance(value, six.string_types): value = [value] invalid_types = [] for t in value: try: template.env.get_class(t) except Exception: invalid_types.append(t) if invalid_types: msg = _('The following resource types could not be found: %s') types = ','.join(invalid_types) self._error_message = msg % types return False return True