Upgrade k8s.io/client-go to version 2

vendor/k8s.io/client-go/pkg/api/unversioned/helpers.go

@@ -0,0 +1,183 @@
+/*
+Copyright 2016 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package unversioned
+
+import (
+	"fmt"
+
+	"k8s.io/client-go/pkg/labels"
+	"k8s.io/client-go/pkg/selection"
+)
+
+// LabelSelectorAsSelector converts the LabelSelector api type into a struct that implements
+// labels.Selector
+// Note: This function should be kept in sync with the selector methods in pkg/labels/selector.go
+func LabelSelectorAsSelector(ps *LabelSelector) (labels.Selector, error) {
+	if ps == nil {
+		return labels.Nothing(), nil
+	}
+	if len(ps.MatchLabels)+len(ps.MatchExpressions) == 0 {
+		return labels.Everything(), nil
+	}
+	selector := labels.NewSelector()
+	for k, v := range ps.MatchLabels {
+		r, err := labels.NewRequirement(k, selection.Equals, []string{v})
+		if err != nil {
+			return nil, err
+		}
+		selector = selector.Add(*r)
+	}
+	for _, expr := range ps.MatchExpressions {
+		var op selection.Operator
+		switch expr.Operator {
+		case LabelSelectorOpIn:
+			op = selection.In
+		case LabelSelectorOpNotIn:
+			op = selection.NotIn
+		case LabelSelectorOpExists:
+			op = selection.Exists
+		case LabelSelectorOpDoesNotExist:
+			op = selection.DoesNotExist
+		default:
+			return nil, fmt.Errorf("%q is not a valid pod selector operator", expr.Operator)
+		}
+		r, err := labels.NewRequirement(expr.Key, op, append([]string(nil), expr.Values...))
+		if err != nil {
+			return nil, err
+		}
+		selector = selector.Add(*r)
+	}
+	return selector, nil
+}
+
+// LabelSelectorAsMap converts the LabelSelector api type into a map of strings, ie. the
+// original structure of a label selector. Operators that cannot be converted into plain
+// labels (Exists, DoesNotExist, NotIn, and In with more than one value) will result in
+// an error.
+func LabelSelectorAsMap(ps *LabelSelector) (map[string]string, error) {
+	if ps == nil {
+		return nil, nil
+	}
+	selector := map[string]string{}
+	for k, v := range ps.MatchLabels {
+		selector[k] = v
+	}
+	for _, expr := range ps.MatchExpressions {
+		switch expr.Operator {
+		case LabelSelectorOpIn:
+			if len(expr.Values) != 1 {
+				return selector, fmt.Errorf("operator %q without a single value cannot be converted into the old label selector format", expr.Operator)
+			}
+			// Should we do anything in case this will override a previous key-value pair?
+			selector[expr.Key] = expr.Values[0]
+		case LabelSelectorOpNotIn, LabelSelectorOpExists, LabelSelectorOpDoesNotExist:
+			return selector, fmt.Errorf("operator %q cannot be converted into the old label selector format", expr.Operator)
+		default:
+			return selector, fmt.Errorf("%q is not a valid selector operator", expr.Operator)
+		}
+	}
+	return selector, nil
+}
+
+// ParseToLabelSelector parses a string representing a selector into a LabelSelector object.
+// Note: This function should be kept in sync with the parser in pkg/labels/selector.go
+func ParseToLabelSelector(selector string) (*LabelSelector, error) {
+	reqs, err := labels.ParseToRequirements(selector)
+	if err != nil {
+		return nil, fmt.Errorf("couldn't parse the selector string \"%s\": %v", selector, err)
+	}
+
+	labelSelector := &LabelSelector{
+		MatchLabels:      map[string]string{},
+		MatchExpressions: []LabelSelectorRequirement{},
+	}
+	for _, req := range reqs {
+		var op LabelSelectorOperator
+		switch req.Operator() {
+		case selection.Equals, selection.DoubleEquals:
+			vals := req.Values()
+			if vals.Len() != 1 {
+				return nil, fmt.Errorf("equals operator must have exactly one value")
+			}
+			val, ok := vals.PopAny()
+			if !ok {
+				return nil, fmt.Errorf("equals operator has exactly one value but it cannot be retrieved")
+			}
+			labelSelector.MatchLabels[req.Key()] = val
+			continue
+		case selection.In:
+			op = LabelSelectorOpIn
+		case selection.NotIn:
+			op = LabelSelectorOpNotIn
+		case selection.Exists:
+			op = LabelSelectorOpExists
+		case selection.DoesNotExist:
+			op = LabelSelectorOpDoesNotExist
+		case selection.GreaterThan, selection.LessThan:
+			// Adding a separate case for these operators to indicate that this is deliberate
+			return nil, fmt.Errorf("%q isn't supported in label selectors", req.Operator())
+		default:
+			return nil, fmt.Errorf("%q is not a valid label selector operator", req.Operator())
+		}
+		labelSelector.MatchExpressions = append(labelSelector.MatchExpressions, LabelSelectorRequirement{
+			Key:      req.Key(),
+			Operator: op,
+			Values:   req.Values().List(),
+		})
+	}
+	return labelSelector, nil
+}
+
+// SetAsLabelSelector converts the labels.Set object into a LabelSelector api object.
+func SetAsLabelSelector(ls labels.Set) *LabelSelector {
+	if ls == nil {
+		return nil
+	}
+
+	selector := &LabelSelector{
+		MatchLabels: make(map[string]string),
+	}
+	for label, value := range ls {
+		selector.MatchLabels[label] = value
+	}
+
+	return selector
+}
+
+// FormatLabelSelector convert labelSelector into plain string
+func FormatLabelSelector(labelSelector *LabelSelector) string {
+	selector, err := LabelSelectorAsSelector(labelSelector)
+	if err != nil {
+		return "<error>"
+	}
+
+	l := selector.String()
+	if len(l) == 0 {
+		l = "<none>"
+	}
+	return l
+}
+
+func ExtractGroupVersions(l *APIGroupList) []string {
+	var groupVersions []string
+	for _, g := range l.Groups {
+		for _, gv := range g.Versions {
+			groupVersions = append(groupVersions, gv.GroupVersion)
+		}
+	}
+	return groupVersions
+}