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labels.go
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labels.go
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package selection
import (
"sort"
"strings"
"github.com/pkg/errors"
k8slabels "k8s.io/apimachinery/pkg/labels"
k8svalidation "k8s.io/apimachinery/pkg/util/validation"
)
// LabelSelector is a type that performs matching against a set of labels.
type LabelSelector interface {
// Matches checks whether or not a set of labels is matched by the selector.
Matches(labels map[string]string) bool
}
// labelSelector is the internal selector implementation. Internally it uses the
// Kubernetes label selection infrastructure.
type labelSelector struct {
// k8sLabelSelector is the underlying Kubernetes label selector.
k8sLabelSelector k8slabels.Selector
}
// Matches implements Selector.Matches.
func (s *labelSelector) Matches(labels map[string]string) bool {
return s.k8sLabelSelector.Matches(k8slabels.Set(labels))
}
// ParseLabelSelector performs label selector parsing. The syntax is currently
// the same as that for Kubernetes.
func ParseLabelSelector(selector string) (LabelSelector, error) {
// Parse the selector using the Kubernetes label infrastructure.
k8sLabelSelector, err := k8slabels.Parse(selector)
if err != nil {
return nil, err
}
// Wrap up the Kubernetes selector.
return &labelSelector{k8sLabelSelector}, nil
}
// ExtractAndSortLabelKeys extracts a list of keys from the label set and sorts
// them.
func ExtractAndSortLabelKeys(labels map[string]string) []string {
// Avoid allocation in the event that there are no labels.
if len(labels) == 0 {
return nil
}
// Create and populate the key slice.
keys := make([]string, 0, len(labels))
for key := range labels {
keys = append(keys, key)
}
// Sort keys.
sort.Strings(keys)
// Done.
return keys
}
// EnsureLabelKeyValid verifies that a key conforms to label key requirements.
// These requirements are currently the same as those for Kubernetes label keys.
func EnsureLabelKeyValid(key string) error {
// Perform validation.
if errs := k8svalidation.IsQualifiedName(key); len(errs) > 0 {
return errors.New(strings.Join(errs, ", "))
}
// Success.
return nil
}
// EnsureLabelValueValid verifies that a value conforms to label value
// requirements. These requirements are currently the same as those for
// Kubernetes label values.
func EnsureLabelValueValid(value string) error {
// Perform validation.
if errs := k8svalidation.IsValidLabelValue(value); len(errs) > 0 {
return errors.New(strings.Join(errs, ", "))
}
// Success.
return nil
}