feat(): initial untested implementation

internal/kube.go

@@ -0,0 +1,137 @@
+package internal
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	log "github.com/sirupsen/logrus"
+	v1 "k8s.io/api/coordination/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/rest"
+)
+
+func generateClient() (kubernetes.Clientset, error) {
+	log.WithFields(log.Fields{
+		"Caller": "generateClient",
+	}).Info("Generating k8s client")
+	config, err := rest.InClusterConfig()
+	if err != nil {
+		return kubernetes.Clientset{}, fmt.Errorf("Could not generate in cluster config: %s", err.Error())
+	}
+	clientset, err := kubernetes.NewForConfig(config)
+	if err != nil {
+		return kubernetes.Clientset{}, fmt.Errorf("Could not generate clientset: %s", err.Error())
+	}
+	return *clientset, nil
+}
+
+func LabelNode(nodeName string, leaseName string, cfg *Config) error {
+
+	client, err := generateClient()
+	if err != nil {
+		return fmt.Errorf("Could not generate client: %s", err.Error())
+	}
+
+	log.WithFields(log.Fields{
+		"Caller": "LabelNode",
+	}).Info(fmt.Sprintf("Trying to label node %s", nodeName))
+
+	node, err := client.CoreV1().Nodes().Get(context.TODO(), nodeName, metav1.GetOptions{})
+	if err != nil {
+		return fmt.Errorf("Could not find Kubernetes node: %s", err.Error())
+	}
+
+	if node.Labels == nil {
+		node.Labels = make(map[string]string)
+	}
+
+	node.Labels[cfg.CiliumLabel] = "true"
+	node.Labels["cilium.uploadfilter24.eu/lease"] = leaseName
+
+	_, err = client.CoreV1().Nodes().Update(context.TODO(), node, metav1.UpdateOptions{})
+	if err != nil {
+		return fmt.Errorf("Could not update node label: %s", err.Error())
+	}
+
+	log.WithFields(log.Fields{
+		"Caller": "LabelNode",
+	}).Info(fmt.Sprintf("Node %s labeled with %s=%s\n", nodeName, cfg.CiliumLabel, "true"))
+
+	return nil
+
+}
+
+func RemoveLabelFromNode(nodeName string) error {
+	client, err := generateClient()
+	if err != nil {
+		return fmt.Errorf("Could not generate client: %s", err.Error())
+	}
+
+	log.WithFields(log.Fields{
+		"Caller": "LabelNode",
+	}).Info(fmt.Sprintf("Removing Label from node %s", nodeName))
+
+	labelKey := "metallb-speaker"
+
+	node, err := client.CoreV1().Nodes().Get(context.TODO(), nodeName, metav1.GetOptions{})
+	if err != nil {
+		panic(err.Error())
+	}
+
+	delete(node.Labels, labelKey)
+
+	_, err = client.CoreV1().Nodes().Update(context.TODO(), node, metav1.UpdateOptions{})
+	if err != nil {
+		panic(err.Error())
+	}
+
+	fmt.Printf("Label %s removed from node %s\n", labelKey, nodeName)
+
+	return nil
+}
+
+func GetCiliumL2Leases() ([]v1.Lease, error) {
+	client, err := generateClient()
+	if err != nil {
+		log.WithFields(log.Fields{"Caller": "GetCiliumL2Leases"}).Errorf("Could not generate client: %s", err.Error())
+		return nil, err
+	}
+
+	leases, err := client.CoordinationV1().Leases("kube-system").List(context.TODO(), metav1.ListOptions{})
+	if err != nil {
+		log.WithFields(log.Fields{"Caller": "GetCiliumL2Leases"}).Errorf("Could not list leases: %s", err.Error())
+		return nil, err
+	}
+
+	ciliumLeases := []v1.Lease{}
+
+	for _, l := range leases.Items {
+		if strings.HasPrefix(l.Name, "cilium-l2announce") {
+			log.WithFields(log.Fields{
+				"Caller": "GetCiliumL2Leases",
+				"Lease":  l.Name,
+			}).Info("Found Cilium L2 lease")
+			// Pretty-print a couple of fields for debugging
+			if l.Spec.HolderIdentity != nil {
+				log.WithFields(log.Fields{"HolderIdentity": *l.Spec.HolderIdentity}).Debug("HolderIdentity")
+			}
+			ciliumLeases = append(ciliumLeases, l)
+		}
+	}
+	return ciliumLeases, nil
+}
+
+func GetNodeNameFromLease(lease v1.Lease) (string, error) {
+	if lease.Spec.HolderIdentity == nil {
+		return "", fmt.Errorf("Lease %s has no HolderIdentity", lease.Name)
+	}
+	holderIdentity := *lease.Spec.HolderIdentity
+	parts := strings.Split(holderIdentity, "-")
+	if len(parts) < 3 {
+		return "", fmt.Errorf("Unexpected HolderIdentity format: %s", holderIdentity)
+	}
+	nodeName := strings.Join(parts[2:], "-")
+	return nodeName, nil
+}