64 lines
1.4 KiB
Go
64 lines
1.4 KiB
Go
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// Copyright 2021 the Pinniped contributors. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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package clusterhost
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import (
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"context"
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"fmt"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/client-go/kubernetes"
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)
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const (
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labelNodeRolePrefix = "node-role.kubernetes.io/"
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nodeLabelRole = "kubernetes.io/node-role"
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controlPlaneNodeRole = "control-plane"
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// this role was deprecated by kubernetes 1.20.
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masterNodeRole = "master"
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)
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type ClusterHost struct {
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client kubernetes.Interface
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}
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func New(client kubernetes.Interface) *ClusterHost {
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return &ClusterHost{client: client}
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}
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func (c *ClusterHost) HasControlPlaneNodes(ctx context.Context) (bool, error) {
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nodes, err := c.client.CoreV1().Nodes().List(ctx, metav1.ListOptions{})
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if err != nil {
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return false, fmt.Errorf("error fetching nodes: %v", err)
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}
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if len(nodes.Items) == 0 {
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return false, fmt.Errorf("no nodes found")
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}
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for _, node := range nodes.Items {
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for k, v := range node.Labels {
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if isControlPlaneNodeRole(k, v) {
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return true, nil
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}
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}
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}
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return false, nil
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}
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func isControlPlaneNodeRole(k string, v string) bool {
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if k == labelNodeRolePrefix+controlPlaneNodeRole {
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return true
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}
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if k == labelNodeRolePrefix+masterNodeRole {
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return true
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}
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if k == nodeLabelRole && v == controlPlaneNodeRole {
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return true
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}
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if k == nodeLabelRole && v == masterNodeRole {
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return true
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}
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return false
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}
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