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cell.go
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cell.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of Cilium
package gateway_api
import (
"context"
"errors"
"fmt"
"github.com/sirupsen/logrus"
"github.com/spf13/pflag"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
ctrlRuntime "sigs.k8s.io/controller-runtime"
gatewayv1 "sigs.k8s.io/gateway-api/apis/v1"
gatewayv1alpha2 "sigs.k8s.io/gateway-api/apis/v1alpha2"
gatewayv1beta1 "sigs.k8s.io/gateway-api/apis/v1beta1"
operatorOption "github.com/cilium/cilium/operator/option"
"github.com/cilium/cilium/operator/pkg/secretsync"
"github.com/cilium/cilium/pkg/hive/cell"
k8sClient "github.com/cilium/cilium/pkg/k8s/client"
)
// Cell manages the Gateway API related controllers.
var Cell = cell.Module(
"gateway-api",
"Manages the Gateway API controllers",
cell.Config(gatewayApiConfig{
EnableGatewayAPISecretsSync: true,
GatewayAPISecretsNamespace: "cilium-secrets",
}),
cell.Invoke(initGatewayAPIController),
cell.Provide(registerSecretSync),
)
var requiredGVK = []schema.GroupVersionKind{
gatewayv1.SchemeGroupVersion.WithKind("gatewayclasses"),
gatewayv1.SchemeGroupVersion.WithKind("gateways"),
gatewayv1.SchemeGroupVersion.WithKind("httproutes"),
gatewayv1beta1.SchemeGroupVersion.WithKind("referencegrants"),
gatewayv1alpha2.SchemeGroupVersion.WithKind("grpcroutes"),
gatewayv1alpha2.SchemeGroupVersion.WithKind("tlsroutes"),
}
type gatewayApiConfig struct {
EnableGatewayAPISecretsSync bool
GatewayAPISecretsNamespace string
}
func (r gatewayApiConfig) Flags(flags *pflag.FlagSet) {
flags.Bool("enable-gateway-api-secrets-sync", r.EnableGatewayAPISecretsSync, "Enables fan-in TLS secrets sync from multiple namespaces to singular namespace (specified by gateway-api-secrets-namespace flag)")
flags.String("gateway-api-secrets-namespace", r.GatewayAPISecretsNamespace, "Namespace having tls secrets used by CEC for Gateway API")
}
type gatewayAPIParams struct {
cell.In
Logger logrus.FieldLogger
K8sClient k8sClient.Clientset
CtrlRuntimeManager ctrlRuntime.Manager
Scheme *runtime.Scheme
Config gatewayApiConfig
}
func initGatewayAPIController(params gatewayAPIParams) error {
if !operatorOption.Config.EnableGatewayAPI {
return nil
}
params.Logger.WithField("requiredGVK", requiredGVK).Info("Checking for required GatewayAPI resources")
if err := checkRequiredCRDs(context.Background(), params.K8sClient); err != nil {
params.Logger.WithError(err).Error("Required GatewayAPI resources are not found, please refer to docs for installation instructions")
return nil
}
if err := registerGatewayAPITypesToScheme(params.Scheme); err != nil {
return err
}
if err := registerReconcilers(
params.CtrlRuntimeManager,
params.Config.GatewayAPISecretsNamespace,
operatorOption.Config.ProxyIdleTimeoutSeconds,
); err != nil {
return fmt.Errorf("failed to create gateway controller: %w", err)
}
return nil
}
// registerSecretSync registers the Gateway API for secret synchronization based on TLS secrets referenced
// by a Cilium Gateway resource.
func registerSecretSync(params gatewayAPIParams) secretsync.SecretSyncRegistrationOut {
if err := checkRequiredCRDs(context.Background(), params.K8sClient); err != nil {
return secretsync.SecretSyncRegistrationOut{}
}
if !operatorOption.Config.EnableGatewayAPI || !params.Config.EnableGatewayAPISecretsSync {
return secretsync.SecretSyncRegistrationOut{}
}
return secretsync.SecretSyncRegistrationOut{
SecretSyncRegistration: &secretsync.SecretSyncRegistration{
RefObject: &gatewayv1.Gateway{},
RefObjectEnqueueFunc: EnqueueTLSSecrets(params.CtrlRuntimeManager.GetClient(), params.Logger),
RefObjectCheckFunc: IsReferencedByCiliumGateway,
SecretsNamespace: params.Config.GatewayAPISecretsNamespace,
},
}
}
func checkRequiredCRDs(ctx context.Context, clientset k8sClient.Clientset) error {
if !clientset.IsEnabled() {
return nil
}
var res error
for _, gvk := range requiredGVK {
crd, err := clientset.ApiextensionsV1().CustomResourceDefinitions().Get(ctx, gvk.GroupKind().String(), metav1.GetOptions{})
if err != nil {
res = errors.Join(res, err)
continue
}
found := false
for _, v := range crd.Spec.Versions {
if v.Name == gvk.Version {
found = true
break
}
}
if !found {
res = errors.Join(res, fmt.Errorf("CRD %q does not have version %q", gvk.GroupKind().String(), gvk.Version))
}
}
return res
}
// registerReconcilers registers the Gateway API reconcilers to the controller-runtime library manager.
func registerReconcilers(mgr ctrlRuntime.Manager, secretsNamespace string, idleTimeoutSeconds int) error {
reconcilers := []interface {
SetupWithManager(mgr ctrlRuntime.Manager) error
}{
newGatewayClassReconciler(mgr),
newGatewayReconciler(mgr, secretsNamespace, idleTimeoutSeconds),
newReferenceGrantReconciler(mgr),
newHTTPRouteReconciler(mgr),
newGRPCRouteReconciler(mgr),
newTLSRouteReconciler(mgr),
}
for _, r := range reconcilers {
if err := r.SetupWithManager(mgr); err != nil {
return fmt.Errorf("failed to setup reconciler: %w", err)
}
}
return nil
}
func registerGatewayAPITypesToScheme(scheme *runtime.Scheme) error {
for gv, f := range map[fmt.Stringer]func(s *runtime.Scheme) error{
gatewayv1.GroupVersion: gatewayv1.AddToScheme,
gatewayv1beta1.GroupVersion: gatewayv1beta1.AddToScheme,
gatewayv1alpha2.GroupVersion: gatewayv1alpha2.AddToScheme,
} {
if err := f(scheme); err != nil {
return fmt.Errorf("failed to add types from %s to scheme: %w", gv, err)
}
}
return nil
}