59 lines
1.8 KiB
Go
59 lines
1.8 KiB
Go
/*
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Copyright 2020 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 topology
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import (
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"k8s.io/api/core/v1"
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)
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// GetZoneKey is a helper function that builds a string identifier that is unique per failure-zone;
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// it returns empty-string for no zone.
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// Since there are currently two separate zone keys:
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// - "failure-domain.beta.kubernetes.io/zone"
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// - "topology.kubernetes.io/zone"
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//
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// GetZoneKey will first check failure-domain.beta.kubernetes.io/zone and if not exists, will then check
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// topology.kubernetes.io/zone
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func GetZoneKey(node *v1.Node) string {
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labels := node.Labels
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if labels == nil {
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return ""
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}
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// TODO: "failure-domain.beta..." names are deprecated, but will
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// stick around a long time due to existing on old extant objects like PVs.
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// Maybe one day we can stop considering them (see #88493).
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zone, ok := labels[v1.LabelFailureDomainBetaZone]
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if !ok {
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zone, _ = labels[v1.LabelTopologyZone]
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}
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region, ok := labels[v1.LabelFailureDomainBetaRegion]
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if !ok {
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region, _ = labels[v1.LabelTopologyRegion]
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}
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if region == "" && zone == "" {
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return ""
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}
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// We include the null character just in case region or failureDomain has a colon
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// (We do assume there's no null characters in a region or failureDomain)
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// As a nice side-benefit, the null character is not printed by fmt.Print or glog
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return region + ":\x00:" + zone
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}
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