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nodes.go
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nodes.go
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// Copyright (c) 2020 VMware, Inc. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package k8s
import (
"context"
"github.com/pkg/errors"
coreV1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/runtime"
)
func GetNodeAddresses(ctx context.Context, kubeconfigPath string, labels, names []string) ([]string, error) {
client, err := New(kubeconfigPath)
if err != nil {
return nil, errors.Wrap(err, "could not initialize search client")
}
nodes, err := getNodes(ctx, client, names, labels)
if err != nil {
return nil, errors.Wrapf(err, "could not fetch nodes")
}
var nodeIps []string
for _, node := range nodes {
nodeIps = append(nodeIps, getNodeInternalIP(node))
}
return nodeIps, nil
}
func getNodes(ctx context.Context, k8sc *Client, names, labels []string) ([]*coreV1.Node, error) {
nodeResults, err := k8sc.Search(ctx, SearchParams{
Groups: []string{"core"},
Kinds: []string{"nodes"},
Names: names,
Labels: labels,
})
if err != nil {
return nil, err
}
// collate
var nodes []*coreV1.Node
for _, result := range nodeResults {
for _, item := range result.List.Items {
node := new(coreV1.Node)
if err := runtime.DefaultUnstructuredConverter.FromUnstructured(item.Object, &node); err != nil {
return nil, err
}
nodes = append(nodes, node)
}
}
return nodes, nil
}
func getNodeInternalIP(node *coreV1.Node) (ipAddr string) {
for _, addr := range node.Status.Addresses {
if addr.Type == "InternalIP" {
ipAddr = addr.Address
return
}
}
return
}