main.go

// Copyright (c) 2022 Cisco Systems, Inc. and its affiliates
// All rights reserved.
//
// 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.
//
// SPDX-License-Identifier: Apache-2.0

package main

import (
	"flag"
	"os"
	"time"

	"app-net-interface.io/kube-awi/pkg/connection_status"
	"app-net-interface.io/kube-awi/pkg/sync"

	// 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"

	"go.uber.org/zap/zapcore"
	"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"
	metricsserver "sigs.k8s.io/controller-runtime/pkg/metrics/server"
	"sigs.k8s.io/controller-runtime/pkg/webhook"

	awiv1alpha1 "app-net-interface.io/kube-awi/api/awi/v1alpha1"
	"app-net-interface.io/kube-awi/client"
	"app-net-interface.io/kube-awi/controllers"
	//+kubebuilder:scaffold:imports
)

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

	// TODO make configurable
	statusWatchInterval = 15 * time.Second
)

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

	utilruntime.Must(awiv1alpha1.AddToScheme(scheme))
	//+kubebuilder:scaffold:scheme
}

func main() {
	var metricsAddr string
	var enableLeaderElection bool
	var awiCatalystAddress string
	var probeAddr 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.StringVar(&awiCatalystAddress, "awi-catalyst-address", "localhost:50051", "The address of the AWI GRPC Catalyst SDWAN Controller.")
	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,
		TimeEncoder: zapcore.ISO8601TimeEncoder,
	}
	opts.BindFlags(flag.CommandLine)
	flag.Parse()

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

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme:  scheme,
		Metrics: metricsserver.Options{BindAddress: metricsAddr},
		WebhookServer: webhook.NewServer(webhook.Options{
			Port: 9443,
		}),
		HealthProbeBindAddress: probeAddr,
		LeaderElection:         enableLeaderElection,
		LeaderElectionID:       "7aa1dec1.app-net-interface.io",
	})
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}

	awiClient := client.NewClient(awiCatalystAddress)

	if err = (&controllers.InterNetworkDomainConnectionReconciler{
		Client:    mgr.GetClient(),
		Scheme:    mgr.GetScheme(),
		AwiClient: awiClient,
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "InterNetworkDomainConnection")
		os.Exit(1)
	}
	if err = (&controllers.AppConnectionReconciler{
		Client:      mgr.GetClient(),
		Scheme:      mgr.GetScheme(),
		AwiClient:   awiClient,
		ClusterName: os.Getenv("CLUSTER_NAME"),
	}).SetupWithManager(mgr); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "InterNetworkDomainAppConnection")
		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")
	signalHandler := ctrl.SetupSignalHandler()
	go sync.NewSyncers(mgr.GetClient(), awiClient).StartPeriodicSync(signalHandler)
	go connection_status.WatchStatusUpdates(signalHandler,
		awiClient, mgr.GetClient(), statusWatchInterval)
	if err := mgr.Start(signalHandler); err != nil {
		setupLog.Error(err, "problem running manager")
		os.Exit(1)
	}
}