I'm trying to consume Kafka messages in avro format but I'm not able to decode the messages from avro to json in Go.
I'm using the Confluent platform (3.0.1). For example I produce avro messages like:
kafka-avro-console-producer --broker-list localhost:9092 --topic test --property value.schema='{"type":"record","name":"myrecord","fields":[{"name":"f1","type":"string"}]}'
{"f1":"message1"}
{"f1":"message2"}
Now I consume messages with the go Kafka libary: sarama. Plain text message are working fine. Avro message have to be decoded. I found different libs: github.com/linkedin/goavro, github.com/elodina/go-avro
But after decoding I get a json without values (both libs):
{"f1":""}
goavro:
avroSchema := `
{"type":"record","name":"myrecord","fields":[{"name":"f1","type":"string"}]}
`
codec, err := goavro.NewCodec(avroSchema)
if err != nil {
log.Fatal(err)
}
bb := bytes.NewBuffer(msg.Value)
decoded, err := codec.Decode(bb)
log.Println(fmt.Sprintf("%s", decoded))
go-avro:
schema := avro.MustParseSchema(avroSchema)
reader := avro.NewGenericDatumReader()
reader.SetSchema(schema)
decoder := avro.NewBinaryDecoder(msg.Value)
decodedRecord := avro.NewGenericRecord(schema)
log.Println(decodedRecord.String())
msg = sarama.ConsumerMessage
