forked from banzaicloud/koperator
/
zoneandregion.go
68 lines (58 loc) · 2.01 KB
/
zoneandregion.go
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// Copyright © 2019 Banzai Cloud
//
// 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 k8sutil
import (
"context"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/types"
runtimeClient "sigs.k8s.io/controller-runtime/pkg/client"
)
const (
zoneLabel = "failure-domain.beta.kubernetes.io/zone"
regionLabel = "failure-domain.beta.kubernetes.io/region"
)
func failureDomainSelectors(nodeName string, client runtimeClient.Client) ([]corev1.NodeSelectorTerm, error) {
terms := []corev1.NodeSelectorTerm{}
labels, err := getSpecificNodeLabels(nodeName, client, []string{zoneLabel, regionLabel})
if err != nil {
return nil, err
}
if len(labels) > 0 {
defaultFailureDomainSelector := corev1.NodeSelectorTerm{}
for key, val := range labels {
defaultFailureDomainSelector.MatchExpressions =
append(defaultFailureDomainSelector.MatchExpressions, corev1.NodeSelectorRequirement{
Key: key,
Operator: corev1.NodeSelectorOpIn,
Values: []string{val},
})
}
terms = append(terms, defaultFailureDomainSelector)
}
return terms, nil
}
func getSpecificNodeLabels(nodeName string, client runtimeClient.Client, filter []string) (map[string]string, error) {
node := &corev1.Node{}
err := client.Get(context.TODO(), types.NamespacedName{Name: nodeName, Namespace: ""}, node)
if err != nil {
return nil, err
}
requestedLabels := map[string]string{}
for _, label := range filter {
if val, ok := node.Labels[label]; ok {
requestedLabels[label] = val
}
}
return requestedLabels, nil
}