github.com/timstclair/heapster@v0.20.0-alpha1/Godeps/_workspace/src/k8s.io/kubernetes/pkg/apis/extensions/helpers.go (about) 1 /* 2 Copyright 2015 The Kubernetes Authors All rights reserved. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package extensions 18 19 import ( 20 "fmt" 21 22 "sort" 23 24 "k8s.io/kubernetes/pkg/labels" 25 "k8s.io/kubernetes/pkg/util/sets" 26 ) 27 28 // PodSelectorAsSelector converts the PodSelector api type into a struct that implements 29 // labels.Selector 30 func PodSelectorAsSelector(ps *PodSelector) (labels.Selector, error) { 31 if ps == nil { 32 return labels.Nothing(), nil 33 } 34 if len(ps.MatchLabels)+len(ps.MatchExpressions) == 0 { 35 return labels.Everything(), nil 36 } 37 selector := labels.LabelSelector{} 38 for k, v := range ps.MatchLabels { 39 req, err := labels.NewRequirement(k, labels.InOperator, sets.NewString(v)) 40 if err != nil { 41 return nil, err 42 } 43 selector = append(selector, *req) 44 } 45 for _, expr := range ps.MatchExpressions { 46 var op labels.Operator 47 switch expr.Operator { 48 case PodSelectorOpIn: 49 op = labels.InOperator 50 case PodSelectorOpNotIn: 51 op = labels.NotInOperator 52 case PodSelectorOpExists: 53 op = labels.ExistsOperator 54 case PodSelectorOpDoesNotExist: 55 op = labels.DoesNotExistOperator 56 default: 57 return nil, fmt.Errorf("%q is not a valid pod selector operator", expr.Operator) 58 } 59 req, err := labels.NewRequirement(expr.Key, op, sets.NewString(expr.Values...)) 60 if err != nil { 61 return nil, err 62 } 63 selector = append(selector, *req) 64 } 65 sort.Sort(labels.ByKey(selector)) 66 return selector, nil 67 }