You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.go
    path of file: ./repos/goka/examples/10-visit
    
    the code of the file until where you have to start completion: package main

import (
	"context"
	"fmt"
	"log"
	"os"
	"os/signal"
	"syscall"
	"time"

	"github.com/lovoo/goka"
	"github.com/lovoo/goka/codec"
	"github.com/lovoo/goka/multierr"
)

var (
	brokers             = []string{"localhost:9092"}
	topic   goka.Stream = "example-visit-clicks-input"
	group   goka.Group  = "example-visit-group"

	tmc *goka.TopicManagerConfig
)

func init() {
	// This sets the default replication to 1. If
    
func main() {

	tm, err := goka.NewTopicManager(brokers, goka.DefaultConfig(), tmc)
	if err != nil {
		log.Fatalf("Error creating topic manager: %v", err)
	}
	defer tm.Close()
	err = tm.EnsureStreamExists(string(topic), 8)
	if err != nil {
		log.Fatalf("Error creating kafka topic %s: %v", topic, err)
	}

	sigs := make(chan os.Signal)
	go func() {
		signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM, syscall.SIGKILL)
	}()

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	errg, ctx := multierr.NewErrGroup(ctx)

	g := goka.DefineGroup(group,
		goka.Input(topic, new(codec.Int64), func(ctx goka.Context, msg interface{}) {
			var counter int64
			if val := ctx.Value(); val != nil {
				counter = val.(int64)
			}
			counter += msg.(int64)
			log.Printf("%s: %d", ctx.Key(), counter)
			ctx.SetValue(counter)

		}),
		goka.Visitor("reset", func(ctx goka.Context, meta interface{}) {
			log.Printf("resetting %s: %d", ctx.Key(), meta.(int64))
			ctx.SetValue(meta)
		}),
		goka.Persist(new(codec.Int64)),
	)

	proc, err := goka.NewProcessor(brokers,
		g,
		goka.WithTopicManagerBuilder(goka.TopicManagerBuilderWithTopicManagerConfig(tmc)),
	)
	if err != nil {
		log.Fatalf("error creating processor: %v", err)
	}

	// start the emitter
	errg.Go(func() error {
		runEmitter(ctx)
		return nil
	})

	// start the processor
	errg.Go(func() error {
		return proc.Run(ctx)
	})

	errg.Go(func() error {
		select {
		case <-sigs:
		case <-ctx.Done():
		}
		cancel()
		return nil
	})

	time.Sleep(5 * time.Second)

	visited, err := proc.VisitAllWithStats(ctx, "reset", int64(0))
	if err != nil {
		log.Printf("error visiting: %v", err)
	}

	log.Printf("visited %d values", visited)

	time.Sleep(5 * time.Second)
	log.Printf("stopping...")
	cancel()
	if err := errg.Wait().ErrorOrNil(); err != nil {
		log.Fatalf("error running: %v", err)
	}
	log.Printf("done.")

}