mirror of https://github.com/k3s-io/k3s
95 lines
2.4 KiB
Go
95 lines
2.4 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package unversioned
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import (
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"fmt"
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"k8s.io/kubernetes/pkg/labels"
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"k8s.io/kubernetes/pkg/util/sets"
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)
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// LabelSelectorAsSelector converts the LabelSelector api type into a struct that implements
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// labels.Selector
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func LabelSelectorAsSelector(ps *LabelSelector) (labels.Selector, error) {
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if ps == nil {
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return labels.Nothing(), nil
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}
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if len(ps.MatchLabels)+len(ps.MatchExpressions) == 0 {
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return labels.Everything(), nil
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}
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selector := labels.NewSelector()
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for k, v := range ps.MatchLabels {
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r, err := labels.NewRequirement(k, labels.InOperator, sets.NewString(v))
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if err != nil {
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return nil, err
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}
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selector = selector.Add(*r)
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}
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for _, expr := range ps.MatchExpressions {
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var op labels.Operator
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switch expr.Operator {
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case LabelSelectorOpIn:
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op = labels.InOperator
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case LabelSelectorOpNotIn:
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op = labels.NotInOperator
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case LabelSelectorOpExists:
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op = labels.ExistsOperator
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case LabelSelectorOpDoesNotExist:
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op = labels.DoesNotExistOperator
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default:
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return nil, fmt.Errorf("%q is not a valid pod selector operator", expr.Operator)
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}
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r, err := labels.NewRequirement(expr.Key, op, sets.NewString(expr.Values...))
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if err != nil {
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return nil, err
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}
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selector = selector.Add(*r)
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}
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return selector, nil
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}
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// SetAsLabelSelector converts the labels.Set object into a LabelSelector api object.
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func SetAsLabelSelector(ls labels.Set) *LabelSelector {
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if ls == nil {
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return nil
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}
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selector := &LabelSelector{
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MatchLabels: make(map[string]string),
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}
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for label, value := range ls {
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selector.MatchLabels[label] = value
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}
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return selector
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}
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// FormatLabelSelector convert labelSelector into plain string
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func FormatLabelSelector(labelSelector *LabelSelector) string {
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selector, err := LabelSelectorAsSelector(labelSelector)
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if err != nil {
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return "<error>"
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}
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l := selector.String()
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if len(l) == 0 {
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l = "<none>"
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}
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return l
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}
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