127 lines
4.2 KiB
Go
127 lines
4.2 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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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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// This code is directly lifted from the Kubernetes codebase.
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// For reference:
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// https://github.com/kubernetes/kubernetes/blob/release-1.23/staging/src/k8s.io/kubectl/pkg/cmd/taint/utils.go#L37-L126
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package lifted
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import (
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"fmt"
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"strings"
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corev1 "k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/apimachinery/pkg/util/validation"
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)
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// +lifted:source=https://github.com/kubernetes/kubernetes/blob/release-1.23/staging/src/k8s.io/kubectl/pkg/cmd/taint/utils.go#L37-L73
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// ParseTaints takes a spec which is an array and creates slices for new taints to be added, taints to be deleted.
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// It also validates the spec. For example, the form `<key>` may be used to remove a taint, but not to add one.
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func ParseTaints(spec []string) ([]corev1.Taint, []corev1.Taint, error) {
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var taints, taintsToRemove []corev1.Taint
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uniqueTaints := map[corev1.TaintEffect]sets.String{}
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for _, taintSpec := range spec {
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if strings.HasSuffix(taintSpec, "-") {
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taintToRemove, err := parseTaint(strings.TrimSuffix(taintSpec, "-"))
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if err != nil {
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return nil, nil, err
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}
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taintsToRemove = append(taintsToRemove, corev1.Taint{Key: taintToRemove.Key, Effect: taintToRemove.Effect})
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} else {
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newTaint, err := parseTaint(taintSpec)
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if err != nil {
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return nil, nil, err
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}
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// validate that the taint has an effect, which is required to add the taint
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if len(newTaint.Effect) == 0 {
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return nil, nil, fmt.Errorf("invalid taint spec: %v", taintSpec)
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}
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// validate if taint is unique by <key, effect>
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if len(uniqueTaints[newTaint.Effect]) > 0 && uniqueTaints[newTaint.Effect].Has(newTaint.Key) {
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return nil, nil, fmt.Errorf("duplicated taints with the same key and effect: %v", newTaint)
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}
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// add taint to existingTaints for uniqueness check
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if len(uniqueTaints[newTaint.Effect]) == 0 {
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uniqueTaints[newTaint.Effect] = sets.String{}
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}
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uniqueTaints[newTaint.Effect].Insert(newTaint.Key)
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taints = append(taints, newTaint)
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}
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}
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return taints, taintsToRemove, nil
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}
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// +lifted:source=https://github.com/kubernetes/kubernetes/blob/release-1.23/staging/src/k8s.io/kubectl/pkg/cmd/taint/utils.go#L75-L118
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// parseTaint parses a taint from a string, whose form must be either
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// '<key>=<value>:<effect>', '<key>:<effect>', or '<key>'.
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func parseTaint(st string) (corev1.Taint, error) {
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var taint corev1.Taint
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var key string
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var value string
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var effect corev1.TaintEffect
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parts := strings.Split(st, ":")
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switch len(parts) {
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case 1:
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key = parts[0]
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case 2:
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effect = corev1.TaintEffect(parts[1])
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if err := validateTaintEffect(effect); err != nil {
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return taint, err
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}
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partsKV := strings.Split(parts[0], "=")
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if len(partsKV) > 2 {
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return taint, fmt.Errorf("invalid taint spec: %v", st)
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}
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key = partsKV[0]
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if len(partsKV) == 2 {
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value = partsKV[1]
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if errs := validation.IsValidLabelValue(value); len(errs) > 0 {
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return taint, fmt.Errorf("invalid taint spec: %v, %s", st, strings.Join(errs, "; "))
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}
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}
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default:
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return taint, fmt.Errorf("invalid taint spec: %v", st)
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}
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if errs := validation.IsQualifiedName(key); len(errs) > 0 {
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return taint, fmt.Errorf("invalid taint spec: %v, %s", st, strings.Join(errs, "; "))
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}
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taint.Key = key
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taint.Value = value
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taint.Effect = effect
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return taint, nil
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}
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// +lifted:source=https://github.com/kubernetes/kubernetes/blob/release-1.23/staging/src/k8s.io/kubectl/pkg/cmd/taint/utils.go#L120-L126
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func validateTaintEffect(effect corev1.TaintEffect) error {
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if effect != corev1.TaintEffectNoSchedule && effect != corev1.TaintEffectPreferNoSchedule && effect != corev1.TaintEffectNoExecute {
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return fmt.Errorf("invalid taint effect: %v, unsupported taint effect", effect)
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}
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return nil
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}
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