kops/cmd/kops-controller/main.go

/*
Copyright 2019 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 (
	"flag"
	"fmt"
	"os"

	corev1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/runtime"
	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
	"k8s.io/klog"
	"k8s.io/kops/cmd/kops-controller/controllers"
	ctrl "sigs.k8s.io/controller-runtime"

	// +kubebuilder:scaffold:imports

	"k8s.io/klog/klogr"
	"k8s.io/kops/pkg/nodeidentity"
	nodeidentityaws "k8s.io/kops/pkg/nodeidentity/aws"
	nodeidentitygce "k8s.io/kops/pkg/nodeidentity/gce"
	nodeidentityos "k8s.io/kops/pkg/nodeidentity/openstack"

	"sigs.k8s.io/controller-runtime/pkg/manager"
)

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

func init() {

	// +kubebuilder:scaffold:scheme
}

type Options struct {
	Cloud      string
	ConfigPath string
}

func main() {
	klog.InitFlags(nil)

	var metricsAddr string
	var enableLeaderElection bool
	flag.StringVar(&metricsAddr, "metrics-addr", ":8080", "The address the metric endpoint binds to.")
	flag.BoolVar(&enableLeaderElection, "enable-leader-election", false,
		"Enable leader election for controller manager. Enabling this will ensure there is only one active controller manager.")

	var opt Options
	flag.StringVar(&opt.Cloud, "cloud", opt.Cloud, "CloudProvider we are using (aws,gce,...)")
	flag.StringVar(&opt.ConfigPath, "config", opt.ConfigPath, "Base location for cluster and instancegroup configurations")

	flag.Parse()

	ctrl.SetLogger(klogr.New())

	if err := buildScheme(); err != nil {
		setupLog.Error(err, "error building scheme")
		os.Exit(1)
	}

	mgr, err := ctrl.NewManager(ctrl.GetConfigOrDie(), ctrl.Options{
		Scheme:             scheme,
		MetricsBindAddress: metricsAddr,
		LeaderElection:     enableLeaderElection,
	})
	if err != nil {
		setupLog.Error(err, "unable to start manager")
		os.Exit(1)
	}

	if err := addNodeController(mgr, &opt); err != nil {
		setupLog.Error(err, "unable to create controller", "controller", "NodeController")
		os.Exit(1)
	}
	// +kubebuilder:scaffold:builder

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

func buildScheme() error {
	if err := corev1.AddToScheme(scheme); err != nil {
		return fmt.Errorf("error registering corev1: %v", err)
	}
	return nil
}

func addNodeController(mgr manager.Manager, opt *Options) error {
	var identifier nodeidentity.Identifier
	var err error
	switch opt.Cloud {
	case "aws":
		identifier, err = nodeidentityaws.New()
		if err != nil {
			return fmt.Errorf("error building identifier: %v", err)
		}
	case "gce":
		identifier, err = nodeidentitygce.New()
		if err != nil {
			return fmt.Errorf("error building identifier: %v", err)
		}

	case "openstack":
		identifier, err = nodeidentityos.New()
		if err != nil {
			return fmt.Errorf("error building identifier: %v", err)
		}

	case "":
		return fmt.Errorf("must specify cloud")

	default:
		return fmt.Errorf("identifier for cloud %q not implemented", opt.Cloud)
	}

	if opt.ConfigPath == "" {
		return fmt.Errorf("must specify config-path")
	}

	nodeController, err := controllers.NewNodeReconciler(mgr, opt.ConfigPath, identifier)
	if err != nil {
		return err
	}
	if err := nodeController.SetupWithManager(mgr); err != nil {
		return err
	}

	return nil
}