main.go

/*
Copyright 2020 The Crossplane 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 (
	"os"
	"path/filepath"
	"time"

	"gopkg.in/alecthomas/kingpin.v2"
	"k8s.io/client-go/tools/leaderelection/resourcelock"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/cache"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"

	"github.com/crossplane/crossplane-runtime/pkg/controller"
	"github.com/crossplane/crossplane-runtime/pkg/feature"
	"github.com/crossplane/crossplane-runtime/pkg/logging"
	"github.com/crossplane/crossplane-runtime/pkg/ratelimiter"

	"github.com/crossplane-contrib/provider-kafka/apis"
	kafkacontroller "github.com/crossplane-contrib/provider-kafka/internal/controller"
)

func main() {
	var (
		app            = kingpin.New(filepath.Base(os.Args[0]), "Kafka support for Crossplane.").DefaultEnvars()
		debug          = app.Flag("debug", "Run with debug logging.").Short('d').Bool()
		leaderElection = app.Flag("leader-election", "Use leader election for the controller manager.").Short('l').Default("false").OverrideDefaultFromEnvar("LEADER_ELECTION").Bool()

		syncPeriod       = app.Flag("sync", "Controller manager sync period such as 300ms, 1.5h, or 2h45m").Short('s').Default("1h").Duration()
		pollInterval     = app.Flag("poll", "How often individual resources will be checked for drift from the desired state").Default("1m").Duration()
		maxReconcileRate = app.Flag("max-reconcile-rate", "The global maximum rate per second at which resources may checked for drift from the desired state.").Default("10").Int()
	)
	kingpin.MustParse(app.Parse(os.Args[1:]))

	zl := zap.New(zap.UseDevMode(*debug))
	log := logging.NewLogrLogger(zl.WithName("provider-kafka"))
	if *debug {
		// The controller-runtime runs with a no-op logger by default. It is
		// *very* verbose even at info level, so we only provide it a real
		// logger when we're running in debug mode.
		ctrl.SetLogger(zl)
	}

	log.Debug(
		"Starting",
		"sync-period", syncPeriod.String(),
		"poll-interval", pollInterval.String(),
		"max-reconcile-rate", maxReconcileRate,
	)

	cfg, err := ctrl.GetConfig()
	kingpin.FatalIfError(err, "Cannot get API server rest config")

	mgr, err := ctrl.NewManager(cfg, ctrl.Options{
		LeaderElection:             *leaderElection,
		LeaderElectionID:           "crossplane-leader-election-provider-kafka",
		LeaderElectionResourceLock: resourcelock.LeasesResourceLock,
		LeaseDuration:              func() *time.Duration { d := 60 * time.Second; return &d }(),
		RenewDeadline:              func() *time.Duration { d := 50 * time.Second; return &d }(),
		Cache: cache.Options{
			SyncPeriod: syncPeriod,
		},
	})
	kingpin.FatalIfError(err, "Cannot create controller manager")
	kingpin.FatalIfError(apis.AddToScheme(mgr.GetScheme()), "Cannot add Kafka APIs to scheme")

	o := controller.Options{
		Logger:                  log,
		MaxConcurrentReconciles: *maxReconcileRate,
		PollInterval:            *pollInterval,
		GlobalRateLimiter:       ratelimiter.NewGlobal(*maxReconcileRate),
		Features:                &feature.Flags{},
	}

	kingpin.FatalIfError(kafkacontroller.Setup(mgr, o), "Cannot setup Kafka controllers")
	kingpin.FatalIfError(mgr.Start(ctrl.SetupSignalHandler()), "Cannot start controller manager")
}