com.goyeau.kafka.streams.circe.CirceSerdes.scala Maven / Gradle / Ivy

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Generic Serdes with Circe for Kafka Streams

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package com.goyeau.kafka.streams.circe

import io.circe.parser._
import io.circe.{Decoder, Encoder, Printer}
import java.nio.charset.StandardCharsets
import java.util
import org.apache.kafka.common.errors.SerializationException
import org.apache.kafka.common.serialization.{Deserializer, Serde, Serdes, Serializer}

object CirceSerdes {

  implicit def serializer[T: Encoder](implicit printer: Printer = Printer.noSpaces): Serializer[T] =
    new Serializer[T] {
      override def configure(configs: util.Map[String, _], isKey: Boolean): Unit = ()
      override def serialize(topic: String, caseClass: T): Array[Byte] =
        printer.print(Encoder[T].apply(caseClass)).getBytes(StandardCharsets.UTF_8)
      override def close(): Unit = ()
    }

  implicit def deserializer[T: Decoder]: Deserializer[T] =
    new Deserializer[T] {
      override def configure(configs: util.Map[String, _], isKey: Boolean): Unit = ()
      override def deserialize(topic: String, data: Array[Byte]): T =
        Option(data).fold(null.asInstanceOf[T]) { data =>
          decode[T](new String(data, StandardCharsets.UTF_8))
            .fold(error => throw new SerializationException(error), identity)
        }
      override def close(): Unit = ()
    }

  implicit def serde[CC: Encoder: Decoder]: Serde[CC] = Serdes.serdeFrom(serializer, deserializer)
}