main.go

/*
 * Copyright (c) 2024 NetLOX Inc
 *
 * 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 (
	"flag"
	"fmt"
	"os"

	// 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"

	netv1 "k8s.io/api/networking/v1"
	"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"

	"loxilb.io/loxilb-ingress-manager/managers"
	"loxilb.io/loxilb-ingress-manager/pkg"

	loxiapi "github.com/loxilb-io/kube-loxilb/pkg/api"
	//+kubebuilder:scaffold:imports
)

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

func init() {
	utilruntime.Must(clientgoscheme.AddToScheme(scheme))

	utilruntime.Must(netv1.AddToScheme(scheme))
	//+kubebuilder:scaffold:scheme
}

func main() {
	var loxilbIngressIP string
	var enableLeaderElection bool
	var probeAddr string
	flag.StringVar(&loxilbIngressIP, "pod-ip", "127.0.0.1", "The address LoxiLB ingress pod's self IP address.")
	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.")
	opts := zap.Options{
		Development: true,
	}
	opts.BindFlags(flag.CommandLine)
	flag.Parse()

	ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts)))

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme:                 scheme,
		HealthProbeBindAddress: probeAddr,
		LeaderElection:         enableLeaderElection,
		LeaderElectionID:       "32179f51.loxilb.io",
		// 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 create manager")
		os.Exit(1)
	}

	go pkg.SpawnLoxiLB()

	if loxilbIngressIP == "127.0.0.1" {
		myIP, _ := pkg.GetLocalNonLoopBackIP()
		if myIP != "" {
			loxilbIngressIP = myIP
		}
	}

	loxiLBLiveCh := make(chan *loxiapi.LoxiClient)
	loxiLBDeadCh := make(chan struct{})
	loxiLBUrl := fmt.Sprintf("http://%s:11111", loxilbIngressIP)
	loxiClient, err := loxiapi.NewLoxiClient(loxiLBUrl, loxiLBLiveCh, loxiLBDeadCh, false, false)
	if err != nil {
		setupLog.Error(err, "failed to create LoxiLB Client")
		os.Exit(1)
	}

	if err = (&managers.LoxilbIngressReconciler{
		Client:     mgr.GetClient(),
		Scheme:     mgr.GetScheme(),
		LoxiClient: loxiClient,
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create manager", "manager", "LoxilbIngress")
		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)
	}
}