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: consumer.go
    path of file: ./repos/goka/examples/7-redis
    
    the code of the file until where you have to start completion: package main

import (
	"context"
	"log"

	"github.com/lovoo/goka"
	storage "github.com/lovoo/goka/storage/redis"

	redis "gopkg.in/redis.v5"
)

// Publisher defines an interface to Publish the event somewhere.
type Publisher interface {
	Publish(ctx context.Context, key string, event *Event) error
	Close() error
}

// Consume starts goka events consumer.
func Consume(pub Publisher, brokers []string, group string, stream string, store string, namespace string) error {
	codec := new(Codec)

	tmc := goka.NewTopicManagerConfig()
	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(stream, 8)
	if err != nil {
		log.Printf("Error creating kafka topic %s: %v", stream, err)
	}

	input := goka.Input(goka.Stream(stream), codec, func(ctx goka.Context, msg interface{}) {
		event, ok := msg.(*Event)
		if o
    
func Consume(pub Publisher, brokers []string, group string, stream string, store string, namespace string) error {
	codec := new(Codec)

	tmc := goka.NewTopicManagerConfig()
	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(stream, 8)
	if err != nil {
		log.Printf("Error creating kafka topic %s: %v", stream, err)
	}

	input := goka.Input(goka.Stream(stream), codec, func(ctx goka.Context, msg interface{}) {
		event, ok := msg.(*Event)
		if ok {
			pub.Publish(context.Background(), ctx.Key(), event)
		}
	})
	graph := goka.DefineGroup(goka.Group(group), input, goka.Persist(codec))

	opts := []goka.ProcessorOption{}
	switch {
	case store != "":
		client := redis.NewClient(&redis.Options{
			Addr: store,
		})
		opts = append(opts, goka.WithStorageBuilder(storage.RedisBuilder(client, namespace)))
		defer client.Close()
	}
	processor, err := goka.NewProcessor(brokers, graph, opts...)
	if err != nil {
		return err
	}

	return processor.Run(context.Background())
}