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labels.go
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labels.go
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package v1
import (
"strings"
"github.com/rancher/opni/pkg/validation"
)
type LabelSelectorOperator string
const (
LabelSelectorOpIn LabelSelectorOperator = "In"
LabelSelectorOpNotIn LabelSelectorOperator = "NotIn"
LabelSelectorOpExists LabelSelectorOperator = "Exists"
LabelSelectorOpDoesNotExist LabelSelectorOperator = "DoesNotExist"
NameLabel = "opni.io/name"
SupportLabel = "opni.io/support-user"
LegacyNameLabel = "kubernetes.io/metadata.name"
)
var (
ErrInternalLabelInSelector = validation.Errorf("cannot use internal label in label selector")
)
func IsLabelInternal(key string) bool {
return strings.HasPrefix(key, "opni.io/")
}
func IsLabelMutable(key string) bool {
if key == NameLabel {
// as a special case, the name label is mutable
return true
}
return !IsLabelInternal(key)
}
func (ls *LabelSelector) ExpressionString() string {
if ls == nil {
return ""
}
expressions := make([]string, 0, len(ls.MatchLabels)+len(ls.MatchExpressions))
for k, v := range ls.MatchLabels {
expressions = append(expressions, (&LabelSelectorRequirement{
Key: k,
Operator: string(LabelSelectorOpIn),
Values: []string{v},
}).ExpressionString())
}
for _, expr := range ls.MatchExpressions {
if expr == nil {
continue
}
expressions = append(expressions, expr.ExpressionString())
}
return strings.Join(expressions, " && ")
}
func (lsr *LabelSelectorRequirement) ExpressionString() string {
if lsr == nil {
return ""
}
switch lsr.Operator {
case string(LabelSelectorOpExists), string(LabelSelectorOpDoesNotExist):
return keyWithOperatorSymbol(lsr.Key, lsr.Operator)
default:
return keyWithOperatorSymbol(lsr.Key, lsr.Operator) + " {" + strings.Join(lsr.Values, ",") + "}"
}
}
func keyWithOperatorSymbol(key string, operator string) string {
switch LabelSelectorOperator(operator) {
case LabelSelectorOpIn:
return key + " ∈"
case LabelSelectorOpNotIn:
return key + " ∉"
case LabelSelectorOpExists:
return "∃ " + key
case LabelSelectorOpDoesNotExist:
return "∄ " + key
default:
return key + " ?"
}
}
func (ls *LabelSelector) IsEmpty() bool {
return ls == nil || (len(ls.MatchLabels) == 0 && len(ls.MatchExpressions) == 0)
}