/
sslCertificateUpdater.go
199 lines (167 loc) · 5.82 KB
/
sslCertificateUpdater.go
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package controllers
import (
"context"
"fmt"
appsv1 "k8s.io/api/apps/v1"
"k8s.io/client-go/util/retry"
"strings"
"github.com/cloudogu/cesapp-lib/registry"
etcdclient "go.etcd.io/etcd/client/v2"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
ctrl "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
)
const (
serverCertificatePath = "/config/_global/certificate"
serverCertificateID = "certificate/server.crt"
serverCertificateKeyID = "certificate/server.key"
certificateSecretName = "ecosystem-certificate"
)
const (
certificateChangeEventReason = "Certificate"
)
// sslCertificateUpdater is responsible to update the ssl certificate of the ecosystem.
type sslCertificateUpdater struct {
client client.Client
namespace string
registry cesRegistry
eventRecorder eventRecorder
}
type cesRegistry interface {
registry.Registry
}
type watchConfigurationContext interface {
registry.WatchConfigurationContext
}
// NewSslCertificateUpdater creates a new updater.
func NewSslCertificateUpdater(client client.Client, namespace string, cesRegistry cesRegistry, recorder eventRecorder) *sslCertificateUpdater {
return &sslCertificateUpdater{
client: client,
namespace: namespace,
registry: cesRegistry,
eventRecorder: recorder,
}
}
// Start starts the update process. This update process runs indefinitely and is designed to be started as goroutine.
func (scu *sslCertificateUpdater) Start(ctx context.Context) error {
logger := ctrl.LoggerFrom(ctx)
logger.Info("Starting ssl updater...")
return scu.startEtcdWatch(ctx, scu.registry.RootConfig())
}
func (scu *sslCertificateUpdater) startEtcdWatch(ctx context.Context, reg watchConfigurationContext) error {
ctrl.LoggerFrom(ctx).Info("Start etcd watcher on certificate keys")
sslChannel := make(chan *etcdclient.Response)
go func() {
ctrl.LoggerFrom(ctx).Info("start etcd watcher for ssl certificates")
reg.Watch(ctx, serverCertificatePath, true, sslChannel)
ctrl.LoggerFrom(ctx).Info("stop etcd watcher for ssl certificates")
}()
for {
select {
case <-ctx.Done():
return nil
case <-sslChannel:
ctrl.Log.Info(fmt.Sprintf("Context: [%+v]", ctx))
err := scu.handleSslChange(ctx)
if err != nil {
return err
}
}
}
}
func (scu *sslCertificateUpdater) handleSslChange(ctx context.Context) error {
ctrl.LoggerFrom(ctx).Info("Certificate key changed in registry. Refresh ssl certificate secret...")
cert, key, err := scu.readCertificateFromRegistry()
if err != nil && isEtcdKeyNotFoundError(err) {
message := fmt.Sprintf("The etcd keys [%s/server.crt] and [%s/server.key] are required but not set in the etcd.", serverCertificatePath, serverCertificatePath)
ctrl.LoggerFrom(ctx).Error(fmt.Errorf("%w", err), fmt.Sprintf("%s %s", message, "Writing an event..."))
return nil
} else if err != nil {
return err
}
deployment := &appsv1.Deployment{}
err = scu.client.Get(ctx, types.NamespacedName{Name: "k8s-service-discovery-controller-manager", Namespace: scu.namespace}, deployment)
if err != nil {
return fmt.Errorf("ssl handling: failed to get deployment [%s]: %w", "k8s-service-discovery-controller-manager", err)
}
err = retry.RetryOnConflict(retry.DefaultBackoff, func() error {
sslSecret, ok, err := scu.getSslSecret(ctx)
if err != nil {
return err
}
if !ok {
ctrl.LoggerFrom(ctx).Info("Creating new ssl secret...")
err = scu.createSslSecret(ctx, cert, key)
if err != nil {
return fmt.Errorf("failed to create ssl secret: %w", err)
}
scu.eventRecorder.Event(deployment, v1.EventTypeNormal, certificateChangeEventReason, "SSL secret created.")
return nil
}
sslSecret.StringData = map[string]string{
v1.TLSCertKey: cert,
v1.TLSPrivateKeyKey: key,
}
ctrl.LoggerFrom(ctx).Info("Update ssl secret...")
err = scu.client.Update(ctx, sslSecret)
if err != nil {
return fmt.Errorf("failed to update ssl secret: %w", err)
}
scu.eventRecorder.Event(deployment, v1.EventTypeNormal, certificateChangeEventReason, "SSL secret changed.")
return nil
})
if err != nil {
return fmt.Errorf("timout during ssl secret update: %w", err)
}
return nil
}
func (scu *sslCertificateUpdater) readCertificateFromRegistry() (string, string, error) {
cert, err := scu.registry.GlobalConfig().Get(serverCertificateID)
if err != nil {
return "", "", fmt.Errorf("failed to read the ssl certificate from the registry: %w", err)
}
key, err := scu.registry.GlobalConfig().Get(serverCertificateKeyID)
if err != nil {
return "", "", fmt.Errorf("failed to read the ssl certificate key from the registry: %w", err)
}
return cert, key, nil
}
func (scu *sslCertificateUpdater) getSslSecret(ctx context.Context) (*v1.Secret, bool, error) {
var sslSecret v1.Secret
sslSecretID := types.NamespacedName{
Namespace: scu.namespace,
Name: certificateSecretName,
}
err := scu.client.Get(ctx, sslSecretID, &sslSecret)
if errors.IsNotFound(err) {
return nil, false, nil
} else if err != nil {
return nil, false, fmt.Errorf("failed to retrieve secret [%v] from cluster: %w", sslSecretID, err)
}
return &sslSecret, true, nil
}
func (scu *sslCertificateUpdater) createSslSecret(ctx context.Context, cert string, key string) error {
sslSecret := &v1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: certificateSecretName,
Namespace: scu.namespace,
Labels: k8sCesLabels,
},
StringData: map[string]string{
v1.TLSCertKey: cert,
v1.TLSPrivateKeyKey: key,
},
Type: v1.SecretTypeTLS,
}
err := scu.client.Create(ctx, sslSecret)
if err != nil {
return fmt.Errorf("failed to create secret [%s/%s]: %w", scu.namespace, certificateSecretName, err)
}
return nil
}
func isEtcdKeyNotFoundError(err error) bool {
return strings.Contains(err.Error(), "Key not found")
}