main.go

/*
Copyright 2023 TV 2 DANMARK A/S

Licensed under the Apache License, Version 2.0 (the "License") with the
following modification to section 6. Trademarks:

Section 6. Trademarks is deleted and replaced by the following wording:

6. Trademarks. This License does not grant permission to use the trademarks and
trade names of TV 2 DANMARK A/S, including but not limited to the TV 2® logo and
word mark, except (a) as required for reasonable and customary use in describing
the origin of the Work, e.g. as described in section 4(c) of the License, and
(b) to reproduce the content of the NOTICE file. Any reference to the Licensor
must be made by making a reference to "TV 2 DANMARK A/S", written in capitalized
letters as in this example, unless the format in which the reference is made,
requires lower case letters.

You may not use this software except in compliance with the License and the
modifications set out above.

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 (
	"flag"
	"os"
	"time"

	// Import all Kubernetes client auth plugins (e.g. Azure, GCP, OIDC, etc.)
	// to ensure that exec-entrypoint and run can make use of them.
	_ "k8s.io/client-go/plugin/pkg/client/auth"

	"k8s.io/apimachinery/pkg/runtime"
	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/healthz"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"
	gateway "sigs.k8s.io/gateway-api/apis/v1beta1"

	gatewaytv2dkv1a1 "github.com/tv2-oss/bifrost-gateway-controller/apis/gateway.tv2.dk/v1alpha1"
	"github.com/tv2-oss/bifrost-gateway-controller/controllers"
	//+kubebuilder:scaffold:imports
)

var (
	scheme   = runtime.NewScheme()
	setupLog = ctrl.Log.WithName("setup")

	version = "Version not set"
	date    = "Date not set"
	commit  = "Commit not set"
)

func init() {
	utilruntime.Must(clientgoscheme.AddToScheme(scheme))
	utilruntime.Must(gateway.AddToScheme(scheme))
	utilruntime.Must(gatewaytv2dkv1a1.AddToScheme(scheme))
	//+kubebuilder:scaffold:scheme
}

func main() {
	var metricsAddr string
	var enableLeaderElection bool
	var probeAddr string
	var syncPeriodArg string
	flag.StringVar(&metricsAddr, "metrics-bind-address", ":8080", "The address the metric endpoint binds to.")
	flag.StringVar(&probeAddr, "health-probe-bind-address", ":8081", "The address the probe endpoint binds to.")
	flag.BoolVar(&enableLeaderElection, "leader-elect", false,
		"Enable leader election for controller manager. "+
			"Enabling this will ensure there is only one active controller manager.")
	flag.StringVar(&syncPeriodArg, "sync-period", "120s", "The period between non event-driven resynchronizations")
	flag.StringVar(&controllers.ControllerNamespace, "controller-namespace", "bifrost-gateway-controller-system", "The namespace the controller will watch for global policies")
	opts := zap.Options{
		Development: true,
	}
	opts.BindFlags(flag.CommandLine)
	flag.Parse()

	ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts)))
	setupLog.Info("bifrost-gateway-controller", "version", version, "build-date", date, "commit", commit)

	syncPeriod, err := time.ParseDuration(syncPeriodArg)
	if err != nil {
		setupLog.Error(err, "unable to parse 'sync-period' argument")
		os.Exit(1)
	}

	config := ctrl.GetConfigOrDie()
	mgr, err := ctrl.NewManager(config, ctrl.Options{
		Scheme:                 scheme,
		MetricsBindAddress:     metricsAddr,
		Port:                   9443,
		HealthProbeBindAddress: probeAddr,
		SyncPeriod:             &syncPeriod,
		LeaderElection:         enableLeaderElection,
		LeaderElectionID:       "71264cc8.bifrost-gateway-controller.tv2.dk",
		// LeaderElectionReleaseOnCancel defines if the leader should step down voluntarily
		// when the Manager ends. This requires the binary to immediately end when the
		// Manager is stopped, otherwise, this setting is unsafe. Setting this significantly
		// speeds up voluntary leader transitions as the new leader don't have to wait
		// LeaseDuration time first.
		//
		// In the default scaffold provided, the program ends immediately after
		// the manager stops, so would be fine to enable this option. However,
		// if you are doing or is intended to do any operation such as perform cleanups
		// after the manager stops then its usage might be unsafe.
		// LeaderElectionReleaseOnCancel: true,
	})
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}

	gwctrl := controllers.NewGatewayController(mgr, config)
	if err = gwctrl.SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "Gateway")
		os.Exit(1)
	}
	gwcctrl := controllers.NewGatewayClassController(mgr)
	if err = gwcctrl.SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "GatewayClass")
		os.Exit(1)
	}
	httprtctrl := controllers.NewHTTPRouteController(mgr, config)
	if err = httprtctrl.SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "HTTPRoute")
		os.Exit(1)
	}
	//+kubebuilder:scaffold:builder

	if err := mgr.AddHealthzCheck("healthz", healthz.Ping); err != nil {
		setupLog.Error(err, "unable to set up health check")
		os.Exit(1)
	}
	if err := mgr.AddReadyzCheck("readyz", healthz.Ping); err != nil {
		setupLog.Error(err, "unable to set up ready check")
		os.Exit(1)
	}

	setupLog.Info("starting manager")
	if err := mgr.Start(ctrl.SetupSignalHandler()); err != nil {
		setupLog.Error(err, "problem running manager")
		os.Exit(1)
	}
}