main.go

/*
Copyright 2018 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package main

import (
	"crypto/tls"
	"flag"
	"os"

	"github.com/spf13/pflag"
	"k8s.io/apimachinery/pkg/runtime"
	cliflag "k8s.io/component-base/cli/flag"
	"k8s.io/klog/v2"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/healthz"
	"sigs.k8s.io/controller-runtime/pkg/webhook"
	"sigs.k8s.io/controller-runtime/pkg/webhook/conversion"

	configv1alpha1 "github.com/projectsveltos/addon-controller/api/v1alpha1"
	configv1beta1 "github.com/projectsveltos/addon-controller/api/v1beta1"
	v1alpha1 "github.com/projectsveltos/event-manager/api/v1alpha1"
	v1beta1 "github.com/projectsveltos/event-manager/api/v1beta1"
	libsveltosv1alpha1 "github.com/projectsveltos/libsveltos/api/v1alpha1"
	libsveltosv1beta1 "github.com/projectsveltos/libsveltos/api/v1beta1"
	utilsv1alpha1 "github.com/projectsveltos/sveltosctl/api/v1alpha1"
	utilsv1beta1 "github.com/projectsveltos/sveltosctl/api/v1beta1"
)

var (
	healthAddr  string
	enableHTTP2 bool
)

// Config contains the server (the webhook) cert and key.
type Config struct {
	CertFile string
	KeyFile  string
}

func main() {
	scheme, err := initScheme()
	if err != nil {
		os.Exit(1)
	}

	klog.InitFlags(nil)

	initFlags(pflag.CommandLine)
	pflag.CommandLine.SetNormalizeFunc(cliflag.WordSepNormalizeFunc)
	pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
	pflag.Parse()

	disableHTTP2 := func(c *tls.Config) {
		c.NextProtos = []string{"http/1.1"}
	}

	tlsOpts := []func(*tls.Config){}
	if !enableHTTP2 {
		tlsOpts = append(tlsOpts, disableHTTP2)
	}

	webhookServer := webhook.NewServer(webhook.Options{
		TLSOpts: tlsOpts,
	})

	ctrl.SetLogger(klog.Background())
	ctrlOptions := ctrl.Options{
		Scheme:                 scheme,
		HealthProbeBindAddress: healthAddr,
		WebhookServer:          webhookServer,
	}

	restConfig := ctrl.GetConfigOrDie()

	mgr, err := ctrl.NewManager(restConfig, ctrlOptions)
	if err != nil {
		os.Exit(1)
	}

	mgr.GetWebhookServer().Register("/convert", conversion.NewWebhookHandler(mgr.GetScheme()))

	ctx := ctrl.SetupSignalHandler()
	setupChecks(mgr)

	if err := mgr.Start(ctx); err != nil {
		os.Exit(1)
	}
}

func initFlags(fs *pflag.FlagSet) {
	fs.StringVar(&healthAddr, "health-addr", ":9440",
		"The address the health endpoint binds to.")

	flag.BoolVar(&enableHTTP2, "enable-http2", false,
		"If set, HTTP/2 will be enabled for the metrics and webhook servers")
}

func setupChecks(mgr ctrl.Manager) {
	if err := mgr.AddHealthzCheck("healthz", healthz.Ping); err != nil {
		os.Exit(1)
	}
	if err := mgr.AddReadyzCheck("readyz", healthz.Ping); err != nil {
		os.Exit(1)
	}
}

func initScheme() (*runtime.Scheme, error) {
	s := runtime.NewScheme()
	if err := configv1beta1.AddToScheme(s); err != nil {
		return nil, err
	}
	if err := configv1alpha1.AddToScheme(s); err != nil {
		return nil, err
	}
	if err := libsveltosv1beta1.AddToScheme(s); err != nil {
		return nil, err
	}
	if err := libsveltosv1alpha1.AddToScheme(s); err != nil {
		return nil, err
	}
	if err := v1beta1.AddToScheme(s); err != nil {
		return nil, err
	}
	if err := v1alpha1.AddToScheme(s); err != nil {
		return nil, err
	}
	if err := utilsv1beta1.AddToScheme(s); err != nil {
		return nil, err
	}
	if err := utilsv1alpha1.AddToScheme(s); err != nil {
		return nil, err
	}
	return s, nil
}