k3s/pkg/etcd/metadata_controller.go

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package etcd
import (
"context"
"os"
"time"
controllerv1 "github.com/rancher/wrangler/pkg/generated/controllers/core/v1"
"github.com/sirupsen/logrus"
v1 "k8s.io/api/core/v1"
)
func registerMetadataHandlers(ctx context.Context, etcd *ETCD) {
if etcd.config.DisableETCD {
return
}
nodes := etcd.config.Runtime.Core.Core().V1().Node()
h := &metadataHandler{
etcd: etcd,
nodeController: nodes,
ctx: ctx,
}
logrus.Infof("Starting managed etcd node label controller")
nodes.OnChange(ctx, "managed-etcd-metadata-controller", h.sync)
}
type metadataHandler struct {
etcd *ETCD
nodeController controllerv1.NodeController
ctx context.Context
}
func (m *metadataHandler) sync(key string, node *v1.Node) (*v1.Node, error) {
if node == nil {
return nil, nil
}
nodeName := os.Getenv("NODE_NAME")
if nodeName == "" {
logrus.Debug("waiting for node name to be assigned for managed etcd node label controller")
m.nodeController.EnqueueAfter(key, 5*time.Second)
return node, nil
}
if key == nodeName {
return m.handleSelf(node)
}
return node, nil
}
func (m *metadataHandler) handleSelf(node *v1.Node) (*v1.Node, error) {
if node.Annotations[NodeNameAnnotation] == m.etcd.name &&
node.Annotations[NodeAddressAnnotation] == m.etcd.address &&
node.Labels[EtcdRoleLabel] == "true" &&
node.Labels[ControlPlaneLabel] == "true" {
return node, nil
}
node = node.DeepCopy()
if node.Annotations == nil {
node.Annotations = map[string]string{}
}
node.Annotations[NodeNameAnnotation] = m.etcd.name
node.Annotations[NodeAddressAnnotation] = m.etcd.address
node.Labels[EtcdRoleLabel] = "true"
node.Labels[MasterLabel] = "true"
node.Labels[ControlPlaneLabel] = "true"
return m.nodeController.Update(node)
}