constellation/cli/internal/cloudcmd/upgrade.go

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package cloudcmd
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io"
"github.com/edgelesssys/constellation/internal/constants"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
)
// Upgrader handles upgrading the cluster's components using the CLI.
type Upgrader struct {
measurementsUpdater measurementsUpdater
imageUpdater imageUpdater
writer io.Writer
}
// NewUpgrader returns a new Upgrader.
func NewUpgrader(writer io.Writer) (*Upgrader, error) {
kubeConfig, err := clientcmd.BuildConfigFromFlags("", constants.AdminConfFilename)
if err != nil {
return nil, fmt.Errorf("building kubernetes config: %w", err)
}
kubeClient, err := kubernetes.NewForConfig(kubeConfig)
if err != nil {
return nil, fmt.Errorf("setting up kubernetes client: %w", err)
}
// use unstructured client to avoid importing the operator packages
unstructuredClient, err := dynamic.NewForConfig(kubeConfig)
if err != nil {
return nil, fmt.Errorf("setting up custom resource client: %w", err)
}
return &Upgrader{
measurementsUpdater: &kubeMeasurementsUpdater{client: kubeClient},
imageUpdater: &kubeImageUpdater{client: unstructuredClient},
writer: writer,
}, nil
}
// Upgrade upgrades the cluster to the given measurements and image.
func (u *Upgrader) Upgrade(ctx context.Context, image string, measurements map[uint32][]byte) error {
if err := u.updateMeasurements(ctx, measurements); err != nil {
return fmt.Errorf("updating measurements: %w", err)
}
if err := u.updateImage(ctx, image); err != nil {
return fmt.Errorf("updating image: %w", err)
}
return nil
}
// GetCurrentImage returns the currently used image of the cluster.
func (u *Upgrader) GetCurrentImage(ctx context.Context) (*unstructured.Unstructured, string, error) {
imageStruct, err := u.imageUpdater.getCurrent(ctx, "constellation-coreos")
if err != nil {
return nil, "", err
}
spec, ok := imageStruct.Object["spec"]
if !ok {
return nil, "", errors.New("image spec missing")
}
retErr := errors.New("invalid image spec")
specMap, ok := spec.(map[string]any)
if !ok {
return nil, "", retErr
}
currentImageDefinition, ok := specMap["image"]
if !ok {
return nil, "", retErr
}
imageDefinition, ok := currentImageDefinition.(string)
if !ok {
return nil, "", retErr
}
return imageStruct, imageDefinition, nil
}
func (u *Upgrader) updateMeasurements(ctx context.Context, measurements map[uint32][]byte) error {
existingConf, err := u.measurementsUpdater.getCurrent(ctx, constants.JoinConfigMap)
if err != nil {
return fmt.Errorf("retrieving current measurements: %w", err)
}
var currentMeasurements map[uint32][]byte
if err := json.Unmarshal([]byte(existingConf.Data[constants.MeasurementsFilename]), &currentMeasurements); err != nil {
return fmt.Errorf("retrieving current measurements: %w", err)
}
if len(currentMeasurements) == len(measurements) {
changed := false
for k, v := range currentMeasurements {
if !bytes.Equal(v, measurements[k]) {
// measurements have changed
changed = true
break
}
}
if !changed {
// measurements are the same, nothing to be done
fmt.Fprintln(u.writer, "Cluster is already using the chosen measurements, skipping measurements upgrade")
return nil
}
}
// backup of previous measurements
existingConf.Data["oldMeasurements"] = existingConf.Data[constants.MeasurementsFilename]
measurementsJSON, err := json.Marshal(measurements)
if err != nil {
return fmt.Errorf("marshaling measurements: %w", err)
}
existingConf.Data[constants.MeasurementsFilename] = string(measurementsJSON)
_, err = u.measurementsUpdater.update(ctx, existingConf)
if err != nil {
return fmt.Errorf("setting new measurements: %w", err)
}
fmt.Fprintln(u.writer, "Successfully updated the cluster's expected measurements")
return nil
}
func (u *Upgrader) updateImage(ctx context.Context, image string) error {
currentImage, currentImageDefinition, err := u.GetCurrentImage(ctx)
if err != nil {
return fmt.Errorf("retrieving current image: %w", err)
}
if currentImageDefinition == image {
fmt.Fprintln(u.writer, "Cluster is already using the chosen image, skipping image upgrade")
return nil
}
currentImage.Object["spec"].(map[string]any)["image"] = image
if _, err := u.imageUpdater.update(ctx, currentImage); err != nil {
return fmt.Errorf("setting new image: %w", err)
}
fmt.Fprintln(u.writer, "Successfully updated the cluster's image, upgrades will be applied automatically")
return nil
}
type imageUpdater interface {
getCurrent(ctx context.Context, name string) (*unstructured.Unstructured, error)
update(ctx context.Context, obj *unstructured.Unstructured) (*unstructured.Unstructured, error)
}
type measurementsUpdater interface {
getCurrent(ctx context.Context, name string) (*corev1.ConfigMap, error)
update(ctx context.Context, configMap *corev1.ConfigMap) (*corev1.ConfigMap, error)
}
type kubeImageUpdater struct {
client dynamic.Interface
}
// getCurrent returns the current image definition.
func (u *kubeImageUpdater) getCurrent(ctx context.Context, name string) (*unstructured.Unstructured, error) {
return u.client.Resource(schema.GroupVersionResource{
Group: "update.edgeless.systems",
Version: "v1alpha1",
Resource: "nodeimages",
}).Get(ctx, name, metav1.GetOptions{})
}
// update updates the image definition.
func (u *kubeImageUpdater) update(ctx context.Context, obj *unstructured.Unstructured) (*unstructured.Unstructured, error) {
return u.client.Resource(schema.GroupVersionResource{
Group: "update.edgeless.systems",
Version: "v1alpha1",
Resource: "nodeimages",
}).Update(ctx, obj, metav1.UpdateOptions{})
}
type kubeMeasurementsUpdater struct {
client kubernetes.Interface
}
// getCurrent returns the cluster's expected measurements.
func (u *kubeMeasurementsUpdater) getCurrent(ctx context.Context, name string) (*corev1.ConfigMap, error) {
return u.client.CoreV1().ConfigMaps(constants.ConstellationNamespace).Get(ctx, name, metav1.GetOptions{})
}
// update updates the cluster's expected measurements in Kubernetes.
func (u *kubeMeasurementsUpdater) update(ctx context.Context, configMap *corev1.ConfigMap) (*corev1.ConfigMap, error) {
return u.client.CoreV1().ConfigMaps(constants.ConstellationNamespace).Update(ctx, configMap, metav1.UpdateOptions{})
}