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operator.go
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/
operator.go
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package app
import (
"context"
"flag"
"fmt"
"net"
"os"
"strconv"
"github.com/spf13/cobra"
"k8s.io/apimachinery/pkg/util/sets"
restclient "k8s.io/client-go/rest"
cliflag "k8s.io/component-base/cli/flag"
"k8s.io/component-base/term"
"k8s.io/klog/v2"
controllerruntime "sigs.k8s.io/controller-runtime"
"sigs.k8s.io/controller-runtime/pkg/config"
"sigs.k8s.io/controller-runtime/pkg/healthz"
"github.com/karmada-io/karmada/operator/cmd/operator/app/options"
operatorv1alpha1 "github.com/karmada-io/karmada/operator/pkg/apis/operator/v1alpha1"
ctrlctx "github.com/karmada-io/karmada/operator/pkg/controller/context"
"github.com/karmada-io/karmada/operator/pkg/controller/karmada"
"github.com/karmada-io/karmada/operator/pkg/scheme"
"github.com/karmada-io/karmada/pkg/sharedcli"
"github.com/karmada-io/karmada/pkg/sharedcli/klogflag"
)
// NewOperatorCommand creates a *cobra.Command object with default parameters
func NewOperatorCommand(ctx context.Context) *cobra.Command {
o := options.NewOptions()
cmd := &cobra.Command{
Use: "karmada-operator",
PersistentPreRunE: func(*cobra.Command, []string) error {
// silence client-go warnings.
// karmada-operator generically watches APIs (including deprecated ones),
// and CI ensures it works properly against matching kube-apiserver versions.
restclient.SetDefaultWarningHandler(restclient.NoWarnings{})
return nil
},
RunE: func(cmd *cobra.Command, args []string) error {
if err := o.Validate(); err != nil {
return err
}
return Run(ctx, o)
},
Args: func(cmd *cobra.Command, args []string) error {
for _, arg := range args {
if len(arg) > 0 {
return fmt.Errorf("%q does not take any arguments, got %q", cmd.CommandPath(), args)
}
}
return nil
},
}
fss := cliflag.NamedFlagSets{}
genericFlagSet := fss.FlagSet("generic")
// Add the flag(--kubeconfig) that is added by controller-runtime
// (https://github.com/kubernetes-sigs/controller-runtime/blob/v0.11.1/pkg/client/config/config.go#L39).
genericFlagSet.AddGoFlagSet(flag.CommandLine)
o.AddFlags(genericFlagSet, controllers.ControllerNames(), sets.List(controllersDisabledByDefault))
// Set klog flags
logsFlagSet := fss.FlagSet("logs")
klogflag.Add(logsFlagSet)
cmd.Flags().AddFlagSet(genericFlagSet)
cmd.Flags().AddFlagSet(logsFlagSet)
cols, _, _ := term.TerminalSize(cmd.OutOrStdout())
sharedcli.SetUsageAndHelpFunc(cmd, fss, cols)
return cmd
}
// Run runs the karmada-operator. This should never exit.
func Run(ctx context.Context, o *options.Options) error {
klog.InfoS("Golang settings", "GOGC", os.Getenv("GOGC"), "GOMAXPROCS", os.Getenv("GOMAXPROCS"), "GOTRACEBACK", os.Getenv("GOTRACEBACK"))
manager, err := createControllerManager(ctx, o)
if err != nil {
klog.Errorf("Failed to build controller manager: %v", err)
return err
}
if err := manager.AddHealthzCheck("ping", healthz.Ping); err != nil {
klog.Errorf("Failed to add health check endpoint: %v", err)
return err
}
controllerCtx := ctrlctx.Context{
Controllers: o.Controllers,
Manager: manager,
}
if err := controllers.StartControllers(controllerCtx, controllersDisabledByDefault); err != nil {
klog.Errorf("Failed to start controllers: %v", err)
return err
}
// blocks until the context is done.
if err := manager.Start(ctx); err != nil {
klog.Errorf("controller manager exits unexpectedly: %v", err)
return err
}
// never reach here
return nil
}
var controllers = make(ctrlctx.Initializers)
// controllersDisabledByDefault is the set of controllers which is disabled by default
var controllersDisabledByDefault = sets.New[string]()
func init() {
controllers["karmada"] = startKarmadaController
}
func startKarmadaController(ctx ctrlctx.Context) (bool, error) {
ctrl := &karmada.Controller{
Config: ctx.Manager.GetConfig(),
Client: ctx.Manager.GetClient(),
EventRecorder: ctx.Manager.GetEventRecorderFor(karmada.ControllerName),
}
if err := ctrl.SetupWithManager(ctx.Manager); err != nil {
klog.ErrorS(err, "unable to setup with manager", "controller", karmada.ControllerName)
return false, err
}
return true, nil
}
// createControllerManager creates controllerruntime.Manager from the given configuration
func createControllerManager(ctx context.Context, o *options.Options) (controllerruntime.Manager, error) {
restConfig, err := controllerruntime.GetConfig()
if err != nil {
return nil, err
}
opts := controllerruntime.Options{
Logger: klog.Background(),
Scheme: scheme.Scheme,
BaseContext: func() context.Context {
return ctx
},
SyncPeriod: &o.ResyncPeriod.Duration,
LeaderElection: o.LeaderElection.LeaderElect,
LeaderElectionID: o.LeaderElection.ResourceName,
LeaderElectionNamespace: o.LeaderElection.ResourceNamespace,
LeaseDuration: &o.LeaderElection.LeaseDuration.Duration,
RenewDeadline: &o.LeaderElection.RenewDeadline.Duration,
RetryPeriod: &o.LeaderElection.RetryPeriod.Duration,
LeaderElectionResourceLock: o.LeaderElection.ResourceLock,
HealthProbeBindAddress: net.JoinHostPort(o.BindAddress, strconv.Itoa(o.SecurePort)),
LivenessEndpointName: "/healthz",
MetricsBindAddress: o.MetricsBindAddress,
Controller: config.Controller{
GroupKindConcurrency: map[string]int{
operatorv1alpha1.SchemeGroupVersion.WithKind("Karmada").GroupKind().String(): o.ConcurrentKarmadaSyncs,
},
},
}
return controllerruntime.NewManager(restConfig, opts)
}