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package tamer
import java.io.{InputStream, OutputStream, OutputStreamWriter}
import java.nio.charset.StandardCharsets.UTF_8
import scala.{specialized => sp}
import scala.annotation.{implicitNotFound, nowarn}
sealed abstract class Schema {
def show: String
def isCompatible(previous: String): List[String]
}
object Schema {
final case class Avro(underlying: org.apache.avro.Schema) extends Schema {
import org.apache.avro.SchemaCompatibility.Incompatibility
import org.apache.avro.SchemaCompatibility.SchemaIncompatibilityType._
import scala.jdk.CollectionConverters._
import scala.util.control.NonFatal
private[this] final def asString(i: Incompatibility): String = {
val errorDescription = i.getType() match {
case FIXED_SIZE_MISMATCH =>
s"The size of FIXED type field at path '${i.getLocation()}' in the reader schema (${i
.getReaderFragment()}) does not match with the writer schema (${i.getWriterFragment()})"
case TYPE_MISMATCH =>
s"The type (path '${i.getLocation()}') of a field in the reader schema (${i
.getReaderFragment()}) does not match with the writer schema (${i.getWriterFragment()})"
case NAME_MISMATCH =>
s"The name of the schema has changed (path '${i.getLocation()}')"
case MISSING_ENUM_SYMBOLS =>
s"The reader schema (${i.getReaderFragment()}) is missing enum symbols '${i.getMessage()}' at path '${i
.getLocation()}' in the writer schema (${i.getWriterFragment()})"
case MISSING_UNION_BRANCH =>
s"The reader schema (${i.getReaderFragment()}) is missing a type inside a union field at path '${i
.getLocation()}' in the writer schema (${i.getWriterFragment()})"
case READER_FIELD_MISSING_DEFAULT_VALUE =>
s"The field '${i.getMessage()}' at path '${i.getLocation()}' in the reader schema (${i
.getReaderFragment()}) has no default value and is missing in the writer schema (${i.getWriterFragment()})"
}
s"{errorType:'${i.getType()}', description:'$errorDescription', additionalInfo:'${i.getMessage()}'}"
}
override final def show: String = underlying.toString()
override final def isCompatible(previous: String): List[String] =
try
org.apache.avro.SchemaCompatibility
.checkReaderWriterCompatibility(underlying, Avro.parse(previous))
.getResult()
.getIncompatibilities()
.asScala
.map(asString)
.toList
catch { case NonFatal(e) => s"Unexpected exception during compatibility check: ${e.getMessage()}" :: Nil }
}
private object Avro {
final def parse(s: String): org.apache.avro.Schema = new org.apache.avro.Schema.Parser().parse(s)
}
final def fromAvro(s: =>org.apache.avro.Schema): Schema.Avro = Schema.Avro(s)
}
@implicitNotFound(
"\n" +
"Could not find or construct a \u001b[36mtamer.Codec\u001b[0m instance for type:\n" +
"\n" +
" \u001b[32m${A}\u001b[0m\n" +
"\n" +
"This can happen for a few reasons, but the most common case is a(/some) missing implicit(/implicits).\n" +
"\n" +
"Specifically, you need to ensure that wherever you are expected to provide a \u001b[36mtamer.Codec[\u001b[32m${A}\u001b[0m\u001b[36m]\u001b[0m:\n" +
" 1. If *either* one of the following Avro libraries is in the classpath:\n" +
" a. Vulcan\n" +
" b. Avro4s\n" +
" then, respectively:\n" +
" a. A \u001b[36mvulcan.Codec[\u001b[32m${A}\u001b[0m\u001b[36m]\u001b[0m must be in scope too\n" +
" b. A \u001b[36mcom.sksamuel.avro4s.Decoder[\u001b[32m${A}\u001b[0m\u001b[36m]\u001b[0m, a \u001b[36mcom.sksamuel.avro4s.Encoder[\u001b[32m${A}\u001b[0m\u001b[36m]\u001b[0m, and a \u001b[36mcom.sksamuel.avro4s.SchemaFor[\u001b[32m${A}\u001b[0m\u001b[36m]\u001b[0m must be in scope too.\n" +
" 2. Alternatively, if *either* one of the following is in the classpath:\n" +
" c. Circe\n" +
" d. Jsoniter Scala\n" +
" e. ZIO Json\n" +
" then, respectively:\n" +
" c. An \u001b[36mio.circe.Decoder[\u001b[32m${A}\u001b[0m\u001b[36m]\u001b[0m, and an \u001b[36mio.circe.Encoder[\u001b[32m${A}\u001b[0m\u001b[36m]\u001b[0m must be in scope too\n" +
" d. A \u001b[36mcom.github.plokhotnyuk.jsoniter_scala.core.JsonValueCodec[\u001b[32m${A}\u001b[0m\u001b[36m]\u001b[0m must be in scope too\n" +
" e. A \u001b[36mzio.json.JsonCodec[\u001b[32m${A}\u001b[0m\u001b[36m]\u001b[0m must be in scope too.\n" +
"\n" +
"Given how implicit resolution works in Scala, and more importantly how these implicits are defined in Tamer, care must be taken to avoid ambiguity when multiple Avro or Json libraries are in the classpath concurrently.\n" +
"To cater for this scenario, it is sufficient to explicitly summon the expected underlying \u001b[36mtamer.Codec\u001b[0m's instance provider, that is:\n" +
" a. Vulcan: `import \u001b[36mtamer.Codec.optionalVulcanCodec[\u001b[32m${A}\u001b[0m\u001b[36m]\u001b[0m`\n" +
" b. Avro4s: `import \u001b[36mtamer.Codec.optionalAvro4sCodec[\u001b[32m${A}\u001b[0m\u001b[36m]\u001b[0m`\n" +
" c. Circe: `import \u001b[36mtamer.Codec.optionalCirceCodec[\u001b[32m${A}\u001b[0m\u001b[36m]\u001b[0m`\n" +
" d. Jsoniter Scala: `import \u001b[36mtamer.Codec.optionalJsoniterScalaCodec[\u001b[32m${A}\u001b[0m\u001b[36m]\u001b[0m`\n" +
" e. ZIO Json: `import \u001b[36mtamer.Codec.optionalZioJsonCodec[\u001b[32m${A}\u001b[0m\u001b[36m]\u001b[0m`.\n"
)
sealed trait Codec[@sp A] {
def decode(is: InputStream): A
def encode(value: A, os: OutputStream): Unit
def maybeSchema: Option[Schema]
}
// The series of tricks used to summon implicit instances using optional dependencies
// was proposed by Kai and Pavel Shirshov in https://blog.7mind.io/no-more-orphans.html
object Codec extends LowPriorityCodecs {
final def apply[A](implicit A: Codec[A]): Codec[A] = A
// Vulcan
implicit final def optionalVulcanCodec[A, C[_]: VulcanCodec](implicit ca: C[A]): Codec[A] = new AvroCodec[A] {
private[this] final val _vulcanCodec = ca.asInstanceOf[vulcan.Codec[A]]
override final val schema: Schema.Avro = Schema.fromAvro(_vulcanCodec.schema.fold(error => throw error.throwable, identity))
private[this] final val _genericDatumReader = new org.apache.avro.generic.GenericDatumReader[Any](schema.underlying)
private[this] final val _genericDatumWriter = new org.apache.avro.generic.GenericDatumWriter[Any](schema.underlying)
override final def decode(is: InputStream): A = {
val decoder = org.apache.avro.io.DecoderFactory.get.binaryDecoder(is, null)
_vulcanCodec.decode(_genericDatumReader.read(null, decoder), schema.underlying) match {
case Left(error) => throw error.throwable
case Right(value) => value
}
}
override final def encode(value: A, os: OutputStream): Unit = _vulcanCodec.encode(value) match {
case Left(error) => throw error.throwable
case Right(encoded) =>
val encoder = org.apache.avro.io.EncoderFactory.get.binaryEncoder(os, null)
_genericDatumWriter.write(encoded, encoder)
encoder.flush()
}
}
// Avro4s
implicit final def optionalAvro4sCodec[A, D[_]: Avro4sDecoder, E[_]: Avro4sEncoder, SF[_]: Avro4sSchemaFor](
implicit da: D[A],
ea: E[A],
sfa: SF[A]
): Codec[A] = new AvroCodec[A] {
override final val schema: Schema.Avro = Schema.fromAvro(sfa.asInstanceOf[com.sksamuel.avro4s.SchemaFor[A]].schema)
private[this] final val _avroDecoderBuilder = com.sksamuel.avro4s.AvroInputStream.binary(da.asInstanceOf[com.sksamuel.avro4s.Decoder[A]])
private[this] final val _avroEncoderBuilder =
OutputStreamEncoder.avro4sOutputStream(schema.underlying, ea.asInstanceOf[com.sksamuel.avro4s.Encoder[A]])
override final def decode(is: InputStream): A = _avroDecoderBuilder.from(is).build(schema.underlying).iterator.next()
override final def encode(value: A, os: OutputStream): Unit = {
val ser = _avroEncoderBuilder.to(os).build()
ser.write(value)
ser.close()
}
}
}
private[tamer] sealed trait LowPriorityCodecs extends LowestPriorityCodecs {
// Circe
implicit final def optionalCirceCodec[A, D[_]: CirceDecoder, E[_]: CirceEncoder](implicit da: D[A], ea: E[A]): Codec[A] =
new SchemalessCodec[A] {
private[this] final val _circeDecoder = da.asInstanceOf[io.circe.Decoder[A]]
private[this] final val _circeEncoder = ea.asInstanceOf[io.circe.Encoder[A]]
override final def decode(is: InputStream): A = io.circe.jawn.decodeChannel(java.nio.channels.Channels.newChannel(is))(_circeDecoder) match {
case Left(error) => throw error
case Right(value) => value
}
override final def encode(value: A, os: OutputStream): Unit =
new OutputStreamWriter(os, UTF_8).append(_circeEncoder(value).noSpaces).flush()
}
// Jsoniter-Scala
implicit final def optionalJsoniterScalaCodec[@sp A, C[_]: JsoniterScalaCodec](implicit ca: C[A]): Codec[A] = new SchemalessCodec[A] {
private[this] final val _jsoniterCodec = ca.asInstanceOf[com.github.plokhotnyuk.jsoniter_scala.core.JsonValueCodec[A]]
override final def decode(is: InputStream): A = com.github.plokhotnyuk.jsoniter_scala.core.readFromStream(is)(_jsoniterCodec)
override final def encode(value: A, os: OutputStream): Unit = com.github.plokhotnyuk.jsoniter_scala.core.writeToStream(value, os)(_jsoniterCodec)
}
// ZIO-Json
implicit final def optionalZioJsonCodec[A, C[_]: ZioJsonCodec](implicit ca: C[A]): Codec[A] = new SchemalessCodec[A] {
private[this] final val _zioJsonCodec = ca.asInstanceOf[zio.json.JsonCodec[A]]
override final def decode(is: InputStream): A = zio.Unsafe.unsafe { implicit unsafe =>
zio.Runtime.default.unsafe.run(_zioJsonCodec.decoder.decodeJsonStreamInput(zio.stream.ZStream.fromInputStream(is))).getOrThrowFiberFailure()
}
override final def encode(value: A, os: OutputStream): Unit =
new OutputStreamWriter(os, UTF_8).append(_zioJsonCodec.encodeJson(value, None)).flush()
}
}
private[tamer] sealed trait LowestPriorityCodecs {
private[tamer] sealed abstract class AvroCodec[@sp A] extends Codec[A] {
def schema: Schema.Avro
override final def maybeSchema: Option[Schema] = Some(schema)
}
private[tamer] sealed abstract class SchemalessCodec[@sp A] extends Codec[A] {
override final val maybeSchema: Option[Schema] = None
}
}
private final abstract class VulcanCodec[C[_]]
@nowarn private object VulcanCodec { @inline implicit final def get: VulcanCodec[vulcan.Codec] = null }
private final abstract class Avro4sDecoder[D[_]]
@nowarn private object Avro4sDecoder { @inline implicit final def get: Avro4sDecoder[com.sksamuel.avro4s.Decoder] = null }
private final abstract class Avro4sEncoder[E[_]]
@nowarn private object Avro4sEncoder { @inline implicit final def get: Avro4sEncoder[com.sksamuel.avro4s.Encoder] = null }
private final abstract class Avro4sSchemaFor[SF[_]]
@nowarn private object Avro4sSchemaFor { @inline implicit final def get: Avro4sSchemaFor[com.sksamuel.avro4s.SchemaFor] = null }
private final abstract class CirceDecoder[D[_]]
@nowarn private object CirceDecoder { @inline implicit final def get: CirceDecoder[io.circe.Decoder] = null }
private final abstract class CirceEncoder[E[_]]
@nowarn private object CirceEncoder { @inline implicit final def get: CirceEncoder[io.circe.Encoder] = null }
private final abstract class JsoniterScalaCodec[C[_]]
@nowarn private object JsoniterScalaCodec {
@inline implicit final def get: JsoniterScalaCodec[com.github.plokhotnyuk.jsoniter_scala.core.JsonValueCodec] = null
}
private final abstract class ZioJsonCodec[C[_]]
@nowarn private object ZioJsonCodec { @inline implicit final def get: ZioJsonCodec[zio.json.JsonCodec] = null }
