func TestPodSelectorAsSelector(t *testing.T) {
matchLabels := map[string]string{"foo": "bar"}
matchExpressions := []PodSelectorRequirement{{
Key: "baz",
Operator: PodSelectorOpIn,
Values: []string{"qux", "norf"},
}}
mustParse := func(s string) labels.Selector {
out, e := labels.Parse(s)
if e != nil {
panic(e)
}
return out
}
tc := []struct {
in *PodSelector
out labels.Selector
expectErr bool
}{
{in: nil, out: labels.Nothing()},
{in: &PodSelector{}, out: labels.Everything()},
{
in: &PodSelector{MatchLabels: matchLabels},
out: mustParse("foo in (bar)"),
},
{
in: &PodSelector{MatchExpressions: matchExpressions},
out: mustParse("baz in (norf,qux)"),
},
{
in: &PodSelector{MatchLabels: matchLabels, MatchExpressions: matchExpressions},
out: mustParse("foo in (bar),baz in (norf,qux)"),
},
{
in: &PodSelector{
MatchExpressions: []PodSelectorRequirement{{
Key: "baz",
Operator: PodSelectorOpExists,
Values: []string{"qux", "norf"},
}},
},
expectErr: true,
},
}
for i, tc := range tc {
out, err := PodSelectorAsSelector(tc.in)
if err == nil && tc.expectErr {
t.Errorf("[%v]expected error but got none.", i)
}
if err != nil && !tc.expectErr {
t.Errorf("[%v]did not expect error but got: %v", i, err)
}
if !reflect.DeepEqual(out, tc.out) {
t.Errorf("[%v]expected:\n\t%+v\nbut got:\n\t%+v", i, tc.out, out)
}
}
}
// PodSelectorAsSelector converts the PodSelector api type into a struct that implements
// labels.Selector
func PodSelectorAsSelector(ps *PodSelector) (labels.Selector, error) {
if ps == nil {
return labels.Nothing(), nil
}
if len(ps.MatchLabels)+len(ps.MatchExpressions) == 0 {
return labels.Everything(), nil
}
selector := labels.LabelSelector{}
for k, v := range ps.MatchLabels {
req, err := labels.NewRequirement(k, labels.InOperator, sets.NewString(v))
if err != nil {
return nil, err
}
selector = append(selector, *req)
}
for _, expr := range ps.MatchExpressions {
var op labels.Operator
switch expr.Operator {
case PodSelectorOpIn:
op = labels.InOperator
case PodSelectorOpNotIn:
op = labels.NotInOperator
case PodSelectorOpExists:
op = labels.ExistsOperator
case PodSelectorOpDoesNotExist:
op = labels.DoesNotExistOperator
default:
return nil, fmt.Errorf("%q is not a valid pod selector operator", expr.Operator)
}
req, err := labels.NewRequirement(expr.Key, op, sets.NewString(expr.Values...))
if err != nil {
return nil, err
}
selector = append(selector, *req)
}
sort.Sort(labels.ByKey(selector))
return selector, nil
}