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src/main/scala/io/epiphanous/flinkrunner/serde/AvroJsonSerializer.scala
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|---|---|---|
| @@ -0,0 +1,137 @@ | ||
| package io.epiphanous.flinkrunner.serde | ||
|
|
||
| import com.fasterxml.jackson.core.JsonGenerator | ||
| import com.fasterxml.jackson.databind.ser.std.StdSerializer | ||
| import com.fasterxml.jackson.databind.{JsonSerializer, SerializerProvider} | ||
| import com.typesafe.scalalogging.LazyLogging | ||
| import org.apache.avro.Schema | ||
| import org.apache.avro.Schema.Type._ | ||
| import org.apache.avro.generic.GenericRecord | ||
| import org.apache.flink.api.common.typeinfo.TypeInformation | ||
| import org.apache.flink.api.scala.createTypeInformation | ||
|
|
||
| import scala.annotation.tailrec | ||
| import scala.collection.JavaConverters._ | ||
|
|
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| /** A simple custom jackson serializer to handle serializing avro records | ||
| * (Generic or Specific) | ||
| */ | ||
| class AvroJsonSerializer | ||
| extends StdSerializer[GenericRecord](classOf[GenericRecord]) | ||
| with LazyLogging { | ||
| override def serialize( | ||
| record: GenericRecord, | ||
| gen: JsonGenerator, | ||
| provider: SerializerProvider): Unit = { | ||
| gen.writeStartObject() | ||
| record.getSchema.getFields.asScala.foreach { f => | ||
| _serializeAvroValue( | ||
| f.name(), | ||
| record.get(f.name()), | ||
| f.schema(), | ||
| gen, | ||
| provider | ||
| ) | ||
| } | ||
| gen.writeEndObject() | ||
| } | ||
|
|
||
| @tailrec | ||
| private def _serializeAvroValue[T: TypeInformation]( | ||
| name: String, | ||
| value: T, | ||
| schema: Schema, | ||
| gen: JsonGenerator, | ||
| provider: SerializerProvider): Unit = { | ||
| (schema.getType, value) match { | ||
| case (NULL, _) => gen.writeNullField(name) | ||
| case (_, null | None) => gen.writeNullField(name) | ||
| case (_, Some(v)) => | ||
| _serializeAvroValue(name, v, schema, gen, provider) | ||
| case (RECORD, record: GenericRecord) => | ||
| gen.writeFieldName(name) | ||
| serialize(record, gen, provider) | ||
| case (ENUM, ord: Int) => | ||
| gen.writeStringField(name, schema.getEnumSymbols.get(ord)) | ||
| case (ARRAY, seq: Seq[_]) => | ||
| gen.writeArrayFieldStart(name) | ||
| seq.foreach { e => | ||
| _serializeElement(e, schema.getElementType, gen, provider) | ||
| } | ||
| gen.writeEndArray() | ||
| case (MAP, map: Map[String, _] @unchecked) => | ||
| gen.writeObjectFieldStart(name) | ||
| map.foreach { case (k, e) => | ||
| gen.writeFieldName(k) | ||
| _serializeElement(e, schema.getValueType, gen, provider) | ||
| } | ||
| gen.writeEndObject() | ||
| case (UNION, _) => | ||
| // todo: not a very sophisticated way to process unions, but it covers common case of [null, type] | ||
| val nonNullTypes = | ||
| schema.getTypes.asScala.filterNot(s => s.getType == NULL) | ||
| if (nonNullTypes.size > 1) { | ||
| throw new RuntimeException( | ||
| s"field $name of type union has more than one non-null types: $nonNullTypes" | ||
| ) | ||
| } | ||
| _serializeAvroValue( | ||
| name, | ||
| value, | ||
| nonNullTypes.head, | ||
| gen, | ||
| provider | ||
| ) | ||
| case (FIXED | BYTES, bytes: Array[Byte]) => | ||
| gen.writeBinaryField(name, bytes) | ||
| case (STRING, string: String) => | ||
| gen.writeStringField(name, string) | ||
| case (INT, int: Int) => | ||
| gen.writeNumberField(name, int) | ||
| case (LONG, long: Long) => gen.writeNumberField(name, long) | ||
| case (FLOAT, float: Float) => gen.writeNumberField(name, float) | ||
| case (DOUBLE, double: Double) => gen.writeNumberField(name, double) | ||
| case (BOOLEAN, boolean: Boolean) => | ||
| gen.writeBooleanField(name, boolean) | ||
| case _ => | ||
| gen.writeFieldName(name) | ||
| provider | ||
| .findValueSerializer( | ||
| implicitly[TypeInformation[T]].getTypeClass | ||
| ) | ||
| .asInstanceOf[JsonSerializer[T]] | ||
| .serialize(value, gen, provider) | ||
| } | ||
| } | ||
|
|
||
| private def _serializeElement( | ||
| value: Any, | ||
| schema: Schema, | ||
| gen: JsonGenerator, | ||
| provider: SerializerProvider): Unit = { | ||
| (schema.getType, value) match { | ||
| case (_, null | None) => gen.writeNull() | ||
| case (_, Some(v)) => _serializeElement(v, schema, gen, provider) | ||
| case (RECORD, record: GenericRecord) => | ||
| serialize(record, gen, provider) | ||
| case (ENUM, ord: Int) => | ||
| gen.writeString(schema.getEnumSymbols.get(ord)) | ||
| case (ARRAY, seq: Seq[_]) => | ||
| seq.foreach { e => | ||
| _serializeElement(e, schema.getElementType, gen, provider) | ||
| } | ||
| case (MAP, _) => gen.writeObject(value) | ||
| case (UNION, _) => // todo | ||
| case (STRING, string: String) => gen.writeString(string) | ||
| case (INT, int: Int) => gen.writeNumber(int) | ||
| case (LONG, long: Long) => gen.writeNumber(long) | ||
| case (DOUBLE, double: Double) => gen.writeNumber(double) | ||
| case (BOOLEAN, boolean: Boolean) => gen.writeBoolean(boolean) | ||
| case _ => | ||
| logger.error( | ||
| s"no serializer for array element type ${schema.getType.name()}" | ||
| ) | ||
| // todo | ||
| } | ||
| } | ||
| } |
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