mirror of https://github.com/kubernetes/kops.git
73 lines
2.1 KiB
Go
73 lines
2.1 KiB
Go
/*
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Copyright 2019 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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package gce
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import (
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"bytes"
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"fmt"
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"net/url"
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"strings"
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"k8s.io/kops/pkg/apis/kops"
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)
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const (
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// The tag name we use to differentiate multiple logically independent clusters running in the same region
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gceLabelNameKubernetesCluster = "k8s-io-cluster-name"
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GceLabelNameInstanceGroup = "k8s-io-instance-group"
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GceLabelNameRolePrefix = "k8s-io-role-"
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GceLabelNameEtcdClusterPrefix = "k8s-io-etcd-"
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ControlPlane = "control-plane"
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Bastion = "bastion"
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Node = "node"
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)
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// EncodeGCELabel encodes a string into an RFC1035 compatible value, suitable for use as GCE label key or value
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// We use a URI inspired escaping, but with - instead of %.
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func EncodeGCELabel(s string) string {
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var b bytes.Buffer
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for i := range len(s) {
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c := s[i]
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if ('0' <= c && c <= '9') || ('a' <= c && c <= 'z') {
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b.WriteByte(c)
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} else {
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b.WriteByte('-')
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b.WriteByte("0123456789abcdef"[c>>4])
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b.WriteByte("0123456789abcdef"[c&15])
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}
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}
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return b.String()
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}
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// DecodeGCELabel reverse EncodeGCELabel, taking the encoded RFC1035 compatible value back to a string
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func DecodeGCELabel(s string) (string, error) {
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uriForm := strings.Replace(s, "-", "%", -1)
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v, err := url.QueryUnescape(uriForm)
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if err != nil {
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return "", fmt.Errorf("cannot decode GCE label: %q", s)
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}
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return v, nil
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}
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// TagForRole return the instance (network) tag used for instances with the given role.
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func TagForRole(clusterName string, role kops.InstanceGroupRole) string {
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return ClusterPrefixedName(GceLabelNameRolePrefix+role.ToLowerString(), clusterName, 63)
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}
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