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app.go
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app.go
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package app
import (
"context"
"fmt"
"os"
extensionscmdcontroller "github.com/gardener/gardener/extensions/pkg/controller/cmd"
"github.com/gardener/gardener/extensions/pkg/util"
extensionscmdwebhook "github.com/gardener/gardener/extensions/pkg/webhook/cmd"
"github.com/gardener/gardener/pkg/apis/core/install"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
gardenerhealthz "github.com/gardener/gardener/pkg/healthz"
"github.com/gardener/gardener/pkg/logger"
"github.com/spf13/cobra"
corev1 "k8s.io/api/core/v1"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
componentbaseconfig "k8s.io/component-base/config"
"k8s.io/component-base/version"
"k8s.io/component-base/version/verflag"
"sigs.k8s.io/controller-runtime/pkg/cache"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/cluster"
"sigs.k8s.io/controller-runtime/pkg/healthz"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/manager"
admissioncmd "github.com/stackitcloud/gardener-extension-acl/pkg/admission/cmd"
"github.com/stackitcloud/gardener-extension-acl/pkg/admission/validator"
)
// ExtensionName is the name of the extension.
const ExtensionName = "acl"
// Name is a const for the name of this component.
const Name = "gardener-extension-admission-acl"
// NewControllerManagerCommand creates a new command for running a acl controller.
func NewControllerManagerCommand(ctx context.Context) *cobra.Command {
var (
restOpts = &extensionscmdcontroller.RESTOptions{}
mgrOpts = &extensionscmdcontroller.ManagerOptions{
LeaderElection: true,
LeaderElectionID: extensionscmdcontroller.LeaderElectionNameID(Name),
LeaderElectionNamespace: os.Getenv("LEADER_ELECTION_NAMESPACE"),
WebhookServerPort: 443,
HealthBindAddress: ":8081",
WebhookCertDir: "/tmp/admission-acl-cert",
}
// options for the webhook server
webhookServerOptions = &extensionscmdwebhook.ServerOptions{
Namespace: os.Getenv("WEBHOOK_CONFIG_NAMESPACE"),
}
webhookSwitches = admissioncmd.GardenWebhookSwitchOptions()
webhookOptions = extensionscmdwebhook.NewAddToManagerOptions(
Name,
"",
nil,
webhookServerOptions,
webhookSwitches,
)
admissionOptions = &admissioncmd.AdmissionOptions{}
aggOption = extensionscmdcontroller.NewOptionAggregator(
restOpts,
mgrOpts,
webhookOptions,
admissionOptions,
)
)
cmd := &cobra.Command{
Use: fmt.Sprintf("admission-%s", ExtensionName),
RunE: func(cmd *cobra.Command, args []string) error {
verflag.PrintAndExitIfRequested()
log, err := logger.NewZapLogger(logger.InfoLevel, logger.FormatJSON)
if err != nil {
return fmt.Errorf("error instantiating zap logger: %w", err)
}
logf.SetLogger(log)
log.Info("Starting "+Name, "version", version.Get())
if err := aggOption.Complete(); err != nil {
return fmt.Errorf("error completing options: %w", err)
}
validator.DefaultAddOptions.MaxAllowedCIDRs = admissionOptions.Completed().MaxAllowedCIDRs
util.ApplyClientConnectionConfigurationToRESTConfig(&componentbaseconfig.ClientConnectionConfiguration{
QPS: 100.0,
Burst: 130,
}, restOpts.Completed().Config)
managerOptions := mgrOpts.Completed().Options()
// Operators can enable the source cluster option via SOURCE_CLUSTER environment variable.
// In-cluster config will be used if no SOURCE_KUBECONFIG is specified.
//
// The source cluster is for instance used by Gardener's certificate controller, to maintain certificate
// secrets in a different cluster ('runtime-garden') than the cluster where the webhook configurations
// are maintained ('virtual-garden').
var sourceClusterConfig *rest.Config
if sourceClusterEnabled := os.Getenv("SOURCE_CLUSTER"); sourceClusterEnabled != "" {
var err error
sourceClusterConfig, err = clientcmd.BuildConfigFromFlags("", os.Getenv("SOURCE_KUBECONFIG"))
if err != nil {
return err
}
managerOptions.LeaderElectionConfig = sourceClusterConfig
} else {
// Restrict the cache for secrets to the configured namespace to avoid the need for cluster-wide list/watch permissions.
managerOptions.Cache = cache.Options{
ByObject: map[client.Object]cache.ByObject{
&corev1.Secret{}: {Namespaces: map[string]cache.Config{webhookOptions.Server.Completed().Namespace: {}}},
},
}
}
mgr, err := manager.New(restOpts.Completed().Config, managerOptions)
if err != nil {
return fmt.Errorf("could not instantiate manager: %w", err)
}
install.Install(mgr.GetScheme())
var sourceCluster cluster.Cluster
if sourceClusterConfig != nil {
log.Info("Configuring source cluster option")
sourceCluster, err = cluster.New(sourceClusterConfig, func(opts *cluster.Options) {
opts.Logger = log
opts.Cache.DefaultNamespaces = map[string]cache.Config{v1beta1constants.GardenNamespace: {}}
})
if err != nil {
return err
}
if err := mgr.AddReadyzCheck("source-informer-sync", gardenerhealthz.NewCacheSyncHealthz(sourceCluster.GetCache())); err != nil {
return err
}
if err = mgr.Add(sourceCluster); err != nil {
return err
}
}
log.Info("Setting up webhook server")
if _, err := webhookOptions.Completed().AddToManager(ctx, mgr, sourceCluster); err != nil {
return err
}
if err := mgr.AddReadyzCheck("informer-sync", gardenerhealthz.NewCacheSyncHealthz(mgr.GetCache())); err != nil {
return fmt.Errorf("could not add readycheck for informers: %w", err)
}
if err := mgr.AddHealthzCheck("ping", healthz.Ping); err != nil {
return fmt.Errorf("could not add healthcheck: %w", err)
}
if err := mgr.AddReadyzCheck("webhook-server", mgr.GetWebhookServer().StartedChecker()); err != nil {
return fmt.Errorf("could not add readycheck of webhook to manager: %w", err)
}
return mgr.Start(ctx)
},
}
aggOption.AddFlags(cmd.Flags())
return cmd
}