func nodeSelectorRequirementsAsFieldSelector()

in scheduling/corev1/nodeaffinity/nodeaffinity.go [251:284]

• 30 lines of code
• 8 McCabe index (conditional complexity)

func nodeSelectorRequirementsAsFieldSelector(nsr []v1.NodeSelectorRequirement, path *field.Path) (fields.Selector, []error) {
	if len(nsr) == 0 {
		return fields.Nothing(), nil
	}
	var errs []error

	var selectors []fields.Selector
	for i, expr := range nsr {
		p := path.Index(i)
		switch expr.Operator {
		case v1.NodeSelectorOpIn:
			if len(expr.Values) != 1 {
				errs = append(errs, field.Invalid(p.Child("values"), expr.Values, "must have one element"))
			} else {
				selectors = append(selectors, fields.OneTermEqualSelector(expr.Key, expr.Values[0]))
			}

		case v1.NodeSelectorOpNotIn:
			if len(expr.Values) != 1 {
				errs = append(errs, field.Invalid(p.Child("values"), expr.Values, "must have one element"))
			} else {
				selectors = append(selectors, fields.OneTermNotEqualSelector(expr.Key, expr.Values[0]))
			}

		default:
			errs = append(errs, field.NotSupported(p.Child("operator"), expr.Operator, validFieldSelectorOperators))
		}
	}

	if len(errs) != 0 {
		return nil, errs
	}
	return fields.AndSelectors(selectors...), nil
}