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Apply DLQ strategies on deserialization failure
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48 changes: 48 additions & 0 deletions
48
.../java/io/smallrye/reactive/messaging/kafka/fault/KafkaDeadLetterSerializationHandler.java
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package io.smallrye.reactive.messaging.kafka.fault; | ||
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import static io.smallrye.reactive.messaging.kafka.DeserializationFailureHandler.DESERIALIZATION_FAILURE_DATA; | ||
import static io.smallrye.reactive.messaging.kafka.DeserializationFailureHandler.DESERIALIZATION_FAILURE_DESERIALIZER; | ||
import static io.smallrye.reactive.messaging.kafka.DeserializationFailureHandler.DESERIALIZATION_FAILURE_IS_KEY; | ||
import static io.smallrye.reactive.messaging.kafka.DeserializationFailureHandler.DESERIALIZATION_FAILURE_KEY_DATA; | ||
import static io.smallrye.reactive.messaging.kafka.DeserializationFailureHandler.DESERIALIZATION_FAILURE_VALUE_DATA; | ||
import static io.smallrye.reactive.messaging.kafka.DeserializationFailureHandler.TRUE_VALUE; | ||
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import java.util.Arrays; | ||
import java.util.Objects; | ||
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import org.apache.kafka.common.header.Header; | ||
import org.apache.kafka.common.header.Headers; | ||
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import io.smallrye.mutiny.Uni; | ||
import io.smallrye.reactive.messaging.kafka.SerializationFailureHandler; | ||
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public class KafkaDeadLetterSerializationHandler<T> implements SerializationFailureHandler<T> { | ||
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@Override | ||
public byte[] decorateSerialization(Uni<byte[]> serialization, String topic, boolean isKey, String serializer, T data, | ||
Headers headers) { | ||
// deserializer failure | ||
if (headers.lastHeader(DESERIALIZATION_FAILURE_DESERIALIZER) != null) { | ||
// data exists | ||
Header dataHeader = headers.lastHeader(DESERIALIZATION_FAILURE_DATA); | ||
if (dataHeader != null) { | ||
// if this is the key serialization we look at the _KEY_DATA header | ||
if (isKey) { | ||
Header isKeyHeader = headers.lastHeader(DESERIALIZATION_FAILURE_IS_KEY); | ||
if (isKeyHeader != null && Arrays.equals(isKeyHeader.value(), TRUE_VALUE)) { | ||
Header keyDataHeader = headers.lastHeader(DESERIALIZATION_FAILURE_KEY_DATA); | ||
// fallback to data header | ||
return Objects.requireNonNullElse(keyDataHeader, dataHeader).value(); | ||
} | ||
// if this is the value serialization we look at the _VALUE_DATA header | ||
} else { | ||
Header valueDataHeader = headers.lastHeader(DESERIALIZATION_FAILURE_VALUE_DATA); | ||
// fallback to data header | ||
return Objects.requireNonNullElse(valueDataHeader, dataHeader).value(); | ||
} | ||
} | ||
} | ||
// call serialization | ||
return SerializationFailureHandler.super.decorateSerialization(serialization, topic, isKey, serializer, data, headers); | ||
} | ||
} |
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