57 lines
1.7 KiB
Go
57 lines
1.7 KiB
Go
package util
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import (
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"context"
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"fmt"
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"net"
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"net/url"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/labels"
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clientset "k8s.io/client-go/kubernetes"
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netutils "k8s.io/utils/net"
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)
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// GetControlplaneEndpoint parses an Endpoint and returns it as a string,
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// or returns an error in case it cannot be parsed.
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func GetControlplaneEndpoint(address, port string) (string, error) {
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var ip = netutils.ParseIPSloppy(address)
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if ip == nil {
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return "", fmt.Errorf("invalid value `%s` given for address", address)
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}
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return formatURL(ip.String(), port).String(), nil
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}
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// formatURL takes a host and a port string and creates a net.URL using https scheme
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func formatURL(host, port string) *url.URL {
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return &url.URL{
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Scheme: "https",
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Host: net.JoinHostPort(host, port),
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}
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}
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// GetAPIServiceIP returns a valid node IP address.
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func GetAPIServiceIP(clientset clientset.Interface) (string, error) {
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nodes, err := clientset.CoreV1().Nodes().List(context.TODO(), metav1.ListOptions{})
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if err != nil || len(nodes.Items) == 0 {
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return "", fmt.Errorf("there are no nodes in cluster, err: %w", err)
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}
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var (
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masterLabel = labels.Set{"node-role.kubernetes.io/master": ""}
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controlplaneLabel = labels.Set{"node-role.kubernetes.io/control-plane": ""}
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)
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// first, select the master node as the IP of APIServer. if there is
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// no master nodes, randomly select a worker node.
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for _, node := range nodes.Items {
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ls := labels.Set(node.GetLabels())
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if masterLabel.AsSelector().Matches(ls) || controlplaneLabel.AsSelector().Matches(ls) {
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if ip := netutils.ParseIPSloppy(node.Status.Addresses[0].Address); ip != nil {
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return ip.String(), nil
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}
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}
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}
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return nodes.Items[0].Status.Addresses[0].Address, nil
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}
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