added req metadata to kafka for fetch topic

validate/common.go

@@ -12,6 +12,7 @@ import (
 	"github.com/minio/minio-go/v7"
 	"github.com/pioz/faker"
 	"github.com/twmb/franz-go/pkg/kgo"
+	"github.com/twmb/franz-go/pkg/kmsg"
 	"go.mongodb.org/mongo-driver/bson"
 	"go.mongodb.org/mongo-driver/bson/primitive"
 	"log"
@@ -229,8 +230,6 @@ func ValidateKafka(brokers []string, topic string) error {
 	kafkaClient, err := kgo.NewClient(
 		kgo.SeedBrokers(brokers...),
 		kgo.ConsumeResetOffset(kgo.NewOffset().AtStart()),
-		kgo.DefaultProduceTopic(topic),
-		kgo.ConsumeTopics(topic),
 	)
 	if err != nil {
 		return err
@@ -243,6 +242,25 @@ func ValidateKafka(brokers []string, topic string) error {
 		return err
 	}
 
+	req := kmsg.NewMetadataRequest()
+	req.Topics = []kmsg.MetadataRequestTopic{
+		{Topic: kmsg.StringPtr(topic)},
+	}
+
+	res, err := req.RequestWith(ctx, kafkaClient)
+	if err != nil {
+		return fmt.Errorf("metadata request failed: %w", err)
+	}
+
+	if len(res.Topics) == 0 {
+		return fmt.Errorf("no metadata returned for topic %q", topic)
+	}
+
+	// если == 0 то существует, https://kafka.apache.org/protocol.html#The_Messages_Metadata
+	if res.Topics[0].ErrorCode != 0 {
+		return fmt.Errorf("topic %q does not exist (error code %d)", topic, res.Topics[0].ErrorCode)
+	}
+
 	return nil
 }