/
endpoint.go
210 lines (178 loc) · 6.19 KB
/
endpoint.go
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package kubeaccess
import (
"context"
"fmt"
"reflect"
"github.com/cosi-project/runtime/pkg/controller"
"github.com/cosi-project/runtime/pkg/resource"
"github.com/cosi-project/runtime/pkg/safe"
"github.com/cosi-project/runtime/pkg/state"
"github.com/siderolabs/gen/optional"
"go.uber.org/zap"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
"github.com/siderolabs/talos/pkg/kubernetes"
"github.com/siderolabs/talos/pkg/machinery/constants"
"github.com/siderolabs/talos/pkg/machinery/resources/config"
"github.com/siderolabs/talos/pkg/machinery/resources/k8s"
"github.com/siderolabs/talos/pkg/machinery/resources/kubeaccess"
"github.com/siderolabs/talos/pkg/machinery/resources/secrets"
)
// EndpointController manages Kubernetes endpoints resource for Talos API endpoints.
type EndpointController struct{}
// Name implements controller.Controller interface.
func (ctrl *EndpointController) Name() string {
return "kubeaccess.EndpointController"
}
// Inputs implements controller.Controller interface.
func (ctrl *EndpointController) Inputs() []controller.Input {
return []controller.Input{
{
Namespace: config.NamespaceName,
Type: kubeaccess.ConfigType,
ID: optional.Some(kubeaccess.ConfigID),
Kind: controller.InputWeak,
},
{
Namespace: secrets.NamespaceName,
Type: secrets.KubernetesType,
ID: optional.Some(secrets.KubernetesID),
Kind: controller.InputWeak,
},
{
Namespace: k8s.ControlPlaneNamespaceName,
Type: k8s.EndpointType,
Kind: controller.InputWeak,
},
}
}
// Outputs implements controller.Controller interface.
func (ctrl *EndpointController) Outputs() []controller.Output {
return nil
}
// Run implements controller.Controller interface.
//
//nolint:gocyclo
func (ctrl *EndpointController) Run(ctx context.Context, r controller.Runtime, logger *zap.Logger) error {
for {
select {
case <-r.EventCh():
case <-ctx.Done():
return nil
}
kubeaccessConfig, err := safe.ReaderGet[*kubeaccess.Config](ctx, r, kubeaccess.NewConfig(config.NamespaceName, kubeaccess.ConfigID).Metadata())
if err != nil {
if !state.IsNotFoundError(err) {
return fmt.Errorf("error fetching kubeaccess config: %w", err)
}
}
if kubeaccessConfig == nil || !kubeaccessConfig.TypedSpec().Enabled {
// disabled, do not do anything
continue
}
// use only api-server endpoints to leave only kubelet node IPs
endpointResource, err := safe.ReaderGet[*k8s.Endpoint](ctx, r, resource.NewMetadata(k8s.ControlPlaneNamespaceName, k8s.EndpointType, k8s.ControlPlaneAPIServerEndpointsID, resource.VersionUndefined))
if err != nil {
if !state.IsNotFoundError(err) {
return fmt.Errorf("error getting endpoints resources: %w", err)
}
}
var endpointAddrs k8s.EndpointList
if endpointResource != nil {
endpointAddrs = endpointAddrs.Merge(endpointResource)
}
if len(endpointAddrs) == 0 {
continue
}
secretsResources, err := safe.ReaderGet[*secrets.Kubernetes](ctx, r, resource.NewMetadata(secrets.NamespaceName, secrets.KubernetesType, secrets.KubernetesID, resource.VersionUndefined))
if err != nil {
if state.IsNotFoundError(err) {
continue
}
return err
}
secrets := secretsResources.TypedSpec()
kubeconfig, err := clientcmd.BuildConfigFromKubeconfigGetter("", func() (*clientcmdapi.Config, error) {
return clientcmd.Load([]byte(secrets.LocalhostAdminKubeconfig))
})
if err != nil {
return fmt.Errorf("error loading kubeconfig: %w", err)
}
if err = ctrl.updateTalosEndpoints(ctx, logger, kubeconfig, endpointAddrs); err != nil {
return err
}
r.ResetRestartBackoff()
}
}
//nolint:gocyclo
func (ctrl *EndpointController) updateTalosEndpoints(ctx context.Context, logger *zap.Logger, kubeconfig *rest.Config, endpointAddrs k8s.EndpointList) error {
client, err := kubernetes.NewForConfig(kubeconfig)
if err != nil {
return fmt.Errorf("error building Kubernetes client: %w", err)
}
defer client.Close() //nolint:errcheck
for {
oldEndpoints, err := client.CoreV1().Endpoints(constants.KubernetesTalosAPIServiceNamespace).Get(ctx, constants.KubernetesTalosAPIServiceName, metav1.GetOptions{})
if err != nil && !apierrors.IsNotFound(err) {
return fmt.Errorf("error getting endpoints: %w", err)
}
var newEndpoints *corev1.Endpoints
if apierrors.IsNotFound(err) {
newEndpoints = &corev1.Endpoints{
ObjectMeta: metav1.ObjectMeta{
Name: constants.KubernetesTalosAPIServiceName,
Namespace: constants.KubernetesTalosAPIServiceNamespace,
Labels: map[string]string{
"provider": constants.KubernetesTalosProvider,
"component": "apid",
},
},
}
} else {
newEndpoints = oldEndpoints.DeepCopy()
}
newEndpoints.Subsets = []corev1.EndpointSubset{
{
Ports: []corev1.EndpointPort{
{
Name: "apid",
Port: constants.ApidPort,
Protocol: "TCP",
},
},
},
}
for _, addr := range endpointAddrs {
newEndpoints.Subsets[0].Addresses = append(newEndpoints.Subsets[0].Addresses,
corev1.EndpointAddress{
IP: addr.String(),
},
)
}
if oldEndpoints != nil && reflect.DeepEqual(oldEndpoints.Subsets, newEndpoints.Subsets) {
// no change, bail out
return nil
}
if oldEndpoints == nil {
_, err = client.CoreV1().Endpoints(constants.KubernetesTalosAPIServiceNamespace).Create(ctx, newEndpoints, metav1.CreateOptions{})
} else {
_, err = client.CoreV1().Endpoints(constants.KubernetesTalosAPIServiceNamespace).Update(ctx, newEndpoints, metav1.UpdateOptions{})
}
switch {
case err == nil:
logger.Info("updated Talos API endpoints in Kubernetes", zap.Strings("endpoints", endpointAddrs.Strings()))
return nil
case apierrors.IsConflict(err) || apierrors.IsAlreadyExists(err):
// retry
default:
return fmt.Errorf("error updating Kubernetes Talos API endpoints: %w", err)
}
}
}