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kube_etcd_endpoints.go
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kube_etcd_endpoints.go
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package op
import (
"context"
"github.com/cybozu-go/cke"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
type kubeEtcdEndpointsCreateOp struct {
apiserver *cke.Node
endpoints []*cke.Node
finished bool
}
// KubeEtcdEndpointsCreateOp returns an Operator to create Endpoints resource for etcd.
func KubeEtcdEndpointsCreateOp(apiserver *cke.Node, cpNodes []*cke.Node) cke.Operator {
return &kubeEtcdEndpointsCreateOp{
apiserver: apiserver,
endpoints: cpNodes,
}
}
func (o *kubeEtcdEndpointsCreateOp) Name() string {
return "create-etcd-endpoints"
}
func (o *kubeEtcdEndpointsCreateOp) NextCommand() cke.Commander {
if o.finished {
return nil
}
o.finished = true
return createEtcdEndpointsCommand{o.apiserver, o.endpoints}
}
type kubeEtcdEndpointsUpdateOp struct {
apiserver *cke.Node
endpoints []*cke.Node
finished bool
}
// KubeEtcdEndpointsUpdateOp returns an Operator to update Endpoints resource for etcd.
func KubeEtcdEndpointsUpdateOp(apiserver *cke.Node, cpNodes []*cke.Node) cke.Operator {
return &kubeEtcdEndpointsUpdateOp{
apiserver: apiserver,
endpoints: cpNodes,
}
}
func (o *kubeEtcdEndpointsUpdateOp) Name() string {
return "update-etcd-endpoints"
}
func (o *kubeEtcdEndpointsUpdateOp) NextCommand() cke.Commander {
if o.finished {
return nil
}
o.finished = true
return updateEtcdEndpointsCommand{o.apiserver, o.endpoints}
}
type createEtcdEndpointsCommand struct {
apiserver *cke.Node
endpoints []*cke.Node
}
func (c createEtcdEndpointsCommand) Run(ctx context.Context, inf cke.Infrastructure) error {
cs, err := inf.K8sClient(ctx, c.apiserver)
if err != nil {
return err
}
// Endpoints needs a corresponding Service.
// If an Endpoints lacks such a Service, it will be removed.
// https://github.com/kubernetes/kubernetes/blob/b7c2d923ef4e166b9572d3aa09ca72231b59b28b/pkg/controller/endpoint/endpoints_controller.go#L392-L397
services := cs.CoreV1().Services("kube-system")
_, err = services.Get(etcdEndpointsName, metav1.GetOptions{})
switch {
case err == nil:
case errors.IsNotFound(err):
_, err = services.Create(&corev1.Service{
ObjectMeta: metav1.ObjectMeta{
Name: etcdEndpointsName,
},
Spec: corev1.ServiceSpec{
Ports: []corev1.ServicePort{{Port: 2379}},
ClusterIP: "None",
},
})
if err != nil {
return err
}
default:
return err
}
subset := corev1.EndpointSubset{
Addresses: make([]corev1.EndpointAddress, len(c.endpoints)),
Ports: []corev1.EndpointPort{{Port: 2379}},
}
for i, n := range c.endpoints {
subset.Addresses[i].IP = n.Address
}
_, err = cs.CoreV1().Endpoints("kube-system").Create(&corev1.Endpoints{
ObjectMeta: metav1.ObjectMeta{
Name: etcdEndpointsName,
},
Subsets: []corev1.EndpointSubset{subset},
})
return err
}
func (c createEtcdEndpointsCommand) Command() cke.Command {
return cke.Command{
Name: "createEtcdEndpointsCommand",
Target: "kube-system/" + etcdEndpointsName,
}
}
type updateEtcdEndpointsCommand struct {
apiserver *cke.Node
endpoints []*cke.Node
}
func (c updateEtcdEndpointsCommand) Run(ctx context.Context, inf cke.Infrastructure) error {
cs, err := inf.K8sClient(ctx, c.apiserver)
if err != nil {
return err
}
subset := corev1.EndpointSubset{
Addresses: make([]corev1.EndpointAddress, len(c.endpoints)),
Ports: []corev1.EndpointPort{{Port: 2379}},
}
for i, n := range c.endpoints {
subset.Addresses[i].IP = n.Address
}
_, err = cs.CoreV1().Endpoints("kube-system").Update(&corev1.Endpoints{
ObjectMeta: metav1.ObjectMeta{
Name: etcdEndpointsName,
},
Subsets: []corev1.EndpointSubset{subset},
})
return err
}
func (c updateEtcdEndpointsCommand) Command() cke.Command {
return cke.Command{
Name: "updateEtcdEndpointsCommand",
Target: "kube-system/" + etcdEndpointsName,
}
}