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controller.go
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controller.go
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package kubernetes
import (
"context"
"sync"
"time"
"github.com/rancher/dynamiclistener"
"github.com/rancher/dynamiclistener/cert"
"github.com/rancher/wrangler/pkg/generated/controllers/core"
v1controller "github.com/rancher/wrangler/pkg/generated/controllers/core/v1"
"github.com/rancher/wrangler/pkg/start"
"github.com/sirupsen/logrus"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/util/retry"
)
type CoreGetter func() *core.Factory
func Load(ctx context.Context, secrets v1controller.SecretController, namespace, name string, backing dynamiclistener.TLSStorage) dynamiclistener.TLSStorage {
storage := &storage{
name: name,
namespace: namespace,
storage: backing,
ctx: ctx,
}
storage.init(secrets)
return storage
}
func New(ctx context.Context, core CoreGetter, namespace, name string, backing dynamiclistener.TLSStorage) dynamiclistener.TLSStorage {
storage := &storage{
name: name,
namespace: namespace,
storage: backing,
ctx: ctx,
}
// lazy init
go func() {
for {
if coreFactory := core(); coreFactory != nil {
storage.init(coreFactory.Core().V1().Secret())
_ = start.All(ctx, 5, coreFactory)
return
}
select {
case <-ctx.Done():
return
case <-time.After(time.Second):
}
}
}()
return storage
}
type storage struct {
sync.RWMutex
namespace, name string
storage dynamiclistener.TLSStorage
secrets v1controller.SecretController
ctx context.Context
tls dynamiclistener.TLSFactory
}
func (s *storage) SetFactory(tls dynamiclistener.TLSFactory) {
s.Lock()
defer s.Unlock()
s.tls = tls
}
func (s *storage) init(secrets v1controller.SecretController) {
s.Lock()
defer s.Unlock()
secrets.OnChange(s.ctx, "tls-storage", func(key string, secret *v1.Secret) (*v1.Secret, error) {
if secret == nil {
return nil, nil
}
if secret.Namespace == s.namespace && secret.Name == s.name {
if err := s.Update(secret); err != nil {
return nil, err
}
}
return secret, nil
})
s.secrets = secrets
secret, err := s.storage.Get()
if err == nil && cert.IsValidTLSSecret(secret) {
// local storage had a cached secret, ensure that it exists in Kubernetes
_, err := s.secrets.Create(&v1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: s.name,
Namespace: s.namespace,
Annotations: secret.Annotations,
},
Type: v1.SecretTypeTLS,
Data: secret.Data,
})
if err != nil && !errors.IsAlreadyExists(err) {
logrus.Warnf("Failed to create Kubernetes secret: %v", err)
}
} else {
// local storage was empty, try to populate it
secret, err := s.secrets.Get(s.namespace, s.name, metav1.GetOptions{})
if err != nil {
if !errors.IsNotFound(err) {
logrus.Warnf("Failed to init Kubernetes secret: %v", err)
}
return
}
if err := s.storage.Update(secret); err != nil {
logrus.Warnf("Failed to init backing storage secret: %v", err)
}
}
}
func (s *storage) Get() (*v1.Secret, error) {
s.RLock()
defer s.RUnlock()
return s.storage.Get()
}
func (s *storage) targetSecret() (*v1.Secret, error) {
s.RLock()
defer s.RUnlock()
existingSecret, err := s.secrets.Get(s.namespace, s.name, metav1.GetOptions{})
if errors.IsNotFound(err) {
return &v1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: s.name,
Namespace: s.namespace,
},
Type: v1.SecretTypeTLS,
}, nil
}
return existingSecret, err
}
func (s *storage) saveInK8s(secret *v1.Secret) (*v1.Secret, error) {
if !s.initComplete() {
return secret, nil
}
targetSecret, err := s.targetSecret()
if err != nil {
return nil, err
}
// if we don't have a TLS factory we can't create certs, so don't bother trying to merge anything,
// in favor of just blindly replacing the fields on the Kubernetes secret.
if s.tls != nil {
// merge new secret with secret from backing storage, if one exists
if existing, err := s.Get(); err == nil && cert.IsValidTLSSecret(existing) {
if newSecret, updated, err := s.tls.Merge(existing, secret); err == nil && updated {
secret = newSecret
}
}
// merge new secret with existing secret from Kubernetes, if one exists
if cert.IsValidTLSSecret(targetSecret) {
if newSecret, updated, err := s.tls.Merge(targetSecret, secret); err != nil {
return nil, err
} else if !updated {
return newSecret, nil
} else {
secret = newSecret
}
}
}
// ensure that the merged secret actually contains data before overwriting the existing fields
if !cert.IsValidTLSSecret(secret) {
logrus.Warnf("Skipping save of TLS secret for %s/%s due to missing certificate data", secret.Namespace, secret.Name)
return targetSecret, nil
}
targetSecret.Annotations = secret.Annotations
targetSecret.Type = v1.SecretTypeTLS
targetSecret.Data = secret.Data
if targetSecret.UID == "" {
logrus.Infof("Creating new TLS secret for %s/%s (count: %d): %v", targetSecret.Namespace, targetSecret.Name, len(targetSecret.Annotations)-1, targetSecret.Annotations)
return s.secrets.Create(targetSecret)
}
logrus.Infof("Updating TLS secret for %s/%s (count: %d): %v", targetSecret.Namespace, targetSecret.Name, len(targetSecret.Annotations)-1, targetSecret.Annotations)
return s.secrets.Update(targetSecret)
}
func (s *storage) Update(secret *v1.Secret) error {
// Asynchronously update the Kubernetes secret, as doing so inline may block the listener from
// accepting new connections if the apiserver becomes unavailable after the Secrets controller
// has been initialized. We're not passing around any contexts here, nor does the controller
// accept any, so there's no good way to soft-fail with a reasonable timeout.
go func() {
if err := s.update(secret); err != nil {
logrus.Errorf("Failed to save TLS secret for %s/%s: %v", secret.Namespace, secret.Name, err)
}
}()
return nil
}
func isConflictOrAlreadyExists(err error) bool {
return errors.IsConflict(err) || errors.IsAlreadyExists(err)
}
func (s *storage) update(secret *v1.Secret) (err error) {
var newSecret *v1.Secret
err = retry.OnError(retry.DefaultRetry, isConflictOrAlreadyExists, func() error {
newSecret, err = s.saveInK8s(secret)
return err
})
if err != nil {
return err
}
// Only hold the lock while updating underlying storage
s.Lock()
defer s.Unlock()
return s.storage.Update(newSecret)
}
func (s *storage) initComplete() bool {
s.RLock()
defer s.RUnlock()
return s.secrets != nil
}