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producer.go
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/
producer.go
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package kafka
import (
"github.com/confluentinc/confluent-kafka-go/kafka"
"github.com/confluentinc/confluent-kafka-go/schemaregistry"
"github.com/confluentinc/confluent-kafka-go/schemaregistry/serde"
"github.com/confluentinc/confluent-kafka-go/schemaregistry/serde/protobuf"
"google.golang.org/protobuf/proto"
)
const (
nullOffset = -1
)
// SRProducer interface
type SRProducer interface {
ProduceMessage(msg proto.Message, topic string) (int64, error)
Close()
}
type srProducer struct {
producer *kafka.Producer
serializer serde.Serializer
}
// NewProducer returns kafka producer with schema registry
func NewProducer(kafkaURL, srURL string) (SRProducer, error) {
p, err := kafka.NewProducer(&kafka.ConfigMap{"bootstrap.servers": kafkaURL})
if err != nil {
return nil, err
}
c, err := schemaregistry.NewClient(schemaregistry.NewConfig(srURL))
if err != nil {
return nil, err
}
s, err := protobuf.NewSerializer(c, serde.ValueSerde, protobuf.NewSerializerConfig())
if err != nil {
return nil, err
}
return &srProducer{
producer: p,
serializer: s,
}, nil
}
// ProduceMessage sends serialized message to kafka using schema registry
func (p *srProducer) ProduceMessage(msg proto.Message, topic string) (int64, error) {
kafkaChan := make(chan kafka.Event)
defer close(kafkaChan)
payload, err := p.serializer.Serialize(topic, msg)
if err != nil {
return nullOffset, err
}
if err = p.producer.Produce(&kafka.Message{
TopicPartition: kafka.TopicPartition{Topic: &topic},
Value: payload,
}, kafkaChan); err != nil {
return nullOffset, err
}
e := <-kafkaChan
switch ev := e.(type) {
case *kafka.Message:
return int64(ev.TopicPartition.Offset), nil
case kafka.Error:
return nullOffset, err
}
return nullOffset, nil
}
// Close schema registry and Kafka
func (p *srProducer) Close() {
p.serializer.Close()
p.producer.Close()
}