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Writer.scala
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Writer.scala
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package tech.unisonui.protobuf.marshal
import java.io.{ByteArrayOutputStream, OutputStream}
import java.{util => ju}
import cats.implicits._
import com.google.protobuf.Descriptors.FieldDescriptor
import com.google.protobuf.Descriptors.FieldDescriptor.Type
import com.google.protobuf.{CodedOutputStream, WireFormat}
import io.circe.{DecodingFailure, Json}
import tech.unisonui.protobuf.data._
import tech.unisonui.protobuf.json._
object Writer {
implicit class WriterOps(private val schema: Schema) {
def write(json: Json): Either[Throwable, Array[Byte]] =
new Writer(schema).write(json)
}
}
class Writer(private val schema: Schema) {
def write(json: Json): Either[Throwable, Array[Byte]] =
schema.root.fold(Array.empty[Byte].asRight[Throwable]) { root =>
val byteArrayOutputStream = new ByteArrayOutputStream()
val result = write(json.deepDropNullValues, root, byteArrayOutputStream)
byteArrayOutputStream.close()
val bytes = byteArrayOutputStream.toByteArray
result.map(_ => bytes)
}
private def write(json: Json,
root: MessageSchema,
output: OutputStream): Either[Throwable, Unit] = {
val cos = CodedOutputStream.newInstance(output)
val result = writeObject(json, root, cos)
cos.flush()
result
}
private def writeObject(
json: Json,
messageSchema: MessageSchema,
output: CodedOutputStream): Either[Throwable, Unit] = {
val fields = getFieldsFromJson(messageSchema, json)
detectMissingRequiredFields(messageSchema, json).fold(fields.traverse {
case (field, value) =>
writeField(output, field, value)
}.map(_ => ()))(Errors.RequiredField(_).asLeft)
}
private def getFieldsFromJson(messageSchema: MessageSchema, json: Json) = {
val fieldMap = messageSchema.fields.map { case (_, field) =>
field.name -> field
}.toMap
val keyValues = json.asObject.toVector.flatMap(_.toVector)
if (messageSchema.isMap) for {
(key, value) <- keyValues
keyField <- fieldMap.get("key").toVector
valueField <- fieldMap.get("value").toVector
tuple <- Vector(keyField -> Json.fromString(key), valueField -> value)
} yield tuple
else
for {
(key, value) <- keyValues
(field, finalValue) <- getOneOfValue(messageSchema, key, value)
} yield (field, finalValue)
}
private def detectMissingRequiredFields(messageSchema: MessageSchema,
json: Json): Option[String] = {
val keyValues = json.asObject.toVector.flatMap(_.toVector).toMap
messageSchema.fields.collectFirst {
case (_, Field(_, name, Label.Required, _, _, _, _, _))
if !keyValues.contains(name) =>
name
}
}
private def getOneOfValue(messageSchema: MessageSchema,
key: String,
currentValue: Json): Vector[(Field, Json)] =
messageSchema.fields.collectFirst {
case (_, field) if field.name == key => field
}.fold {
val keyValues = currentValue.asObject.toVector.flatMap(_.toVector).toMap
for {
oneOf <- messageSchema.oneOfs.get(key).toVector
oneOfType <- keyValues.get("type").toVector.flatMap(_.asString.toVector)
oneOfValue <- keyValues.get("value").toVector
field <- oneOf.collectFirst {
case (_, field) if field.name == oneOfType => field
}.toVector
} yield (field, oneOfValue)
}(field => Vector(field -> currentValue))
private def writeField(output: CodedOutputStream,
field: Field,
value: Json): Either[Throwable, Unit] = {
val wireTypeValue = wireType(field.`type`)
field.label match {
case Label.Repeated =>
writeRepeat(output, field, value, wireTypeValue)
case _ =>
for {
valueFromJson <- value.as[Any]
result <-
if (!field.default.contains(valueFromJson)) {
output.writeTag(field.id, wireTypeValue)
writeValue(output, field, value)
} else ().asRight[Throwable]
} yield result
}
}
private def writeRepeat(output: CodedOutputStream,
field: Field,
value: Json,
wireTypeValue: Int): Either[Throwable, Unit] = {
val maybeList = field.schema match {
case Some(subSchema) if schema.messages.get(subSchema).exists(_.isMap) =>
if (value.isObject)
value.asObject.toVector.flatMap(_.toVector).map(Json.obj(_)).asRight
else
DecodingFailure(
s""""${field.name}" is expecting: ${field.`type`.name}""",
Nil).asLeft
case _ => value.asArray.toVector.flatten.asRight
}
maybeList.flatMap { list =>
if (field.packed) {
val byteArrayOutputStream = new ByteArrayOutputStream()
val bytesOut = CodedOutputStream.newInstance(byteArrayOutputStream)
val result = list.traverse(writeValue(bytesOut, field, _)).map(_ => ())
bytesOut.flush()
output.writeByteArray(field.id, byteArrayOutputStream.toByteArray)
result
} else
list.traverse { value =>
output.writeTag(field.id, wireTypeValue)
writeValue(output, field, value)
}.map(_ => ())
}
}
private def writeValue(out: CodedOutputStream,
field: Field,
value: Json): Either[Throwable, Unit] =
(field.`type` match {
// $COVERAGE-OFF$
case Type.FLOAT => value.as[Float].map(out.writeFloatNoTag)
case Type.DOUBLE => value.as[Double].map(out.writeDoubleNoTag)
case Type.FIXED32 => value.as[Int].map(out.writeFixed32NoTag)
case Type.FIXED64 => value.as[Long].map(out.writeFixed64NoTag)
case Type.INT32 => value.as[Int].map(out.writeInt32NoTag)
case Type.INT64 => value.as[Long].map(out.writeInt64NoTag)
case Type.UINT32 => value.as[Int].map(out.writeUInt32NoTag)
case Type.UINT64 => value.as[Long].map(out.writeUInt64NoTag)
case Type.SFIXED32 => value.as[Int].map(out.writeSFixed32NoTag)
case Type.SFIXED64 => value.as[Long].map(out.writeSFixed64NoTag)
case Type.SINT32 => value.as[Int].map(out.writeSInt32NoTag)
case Type.SINT64 => value.as[Long].map(out.writeSInt64NoTag)
case Type.BOOL => value.as[Boolean].map(out.writeBoolNoTag)
// $COVERAGE-ON$
case Type.STRING =>
value.as[String].map(out.writeStringNoTag)
case Type.BYTES =>
value
.as[String]
.map(string =>
out.writeByteArrayNoTag(ju.Base64.getDecoder.decode(string)))
case Type.ENUM =>
val enumMap = schema.enums(field.schema.get).values.map(_.swap)
value.as[String].map(string => out.writeEnumNoTag(enumMap(string)))
case Type.MESSAGE =>
val baos = new ByteArrayOutputStream()
val bytesOut = CodedOutputStream.newInstance(baos)
val result =
writeObject(value, schema.messages(field.schema.get), bytesOut)
bytesOut.flush()
out.writeByteArrayNoTag(baos.toByteArray)
result
case Type.GROUP =>
(new IllegalArgumentException("Unsupported type: GROUP")).asLeft[Unit]
}).leftMap {
case e: DecodingFailure =>
e.withMessage(s""""${field.name}" is expecting: ${field.`type`.name}""")
case e => e
}
// $COVERAGE-OFF$
private def wireType(fieldType: FieldDescriptor.Type): Int =
(fieldType match {
case Type.FLOAT => WireFormat.FieldType.FLOAT
case Type.DOUBLE => WireFormat.FieldType.DOUBLE
case Type.FIXED32 => WireFormat.FieldType.FIXED32
case Type.FIXED64 => WireFormat.FieldType.FIXED64
case Type.INT32 => WireFormat.FieldType.INT32
case Type.INT64 => WireFormat.FieldType.INT64
case Type.UINT32 => WireFormat.FieldType.UINT32
case Type.UINT64 => WireFormat.FieldType.UINT64
case Type.SFIXED32 => WireFormat.FieldType.SFIXED32
case Type.SFIXED64 => WireFormat.FieldType.SFIXED64
case Type.SINT32 => WireFormat.FieldType.SINT32
case Type.SINT64 => WireFormat.FieldType.SINT64
case Type.BOOL => WireFormat.FieldType.BOOL
case Type.STRING => WireFormat.FieldType.STRING
case Type.BYTES => WireFormat.FieldType.BYTES
case Type.ENUM => WireFormat.FieldType.ENUM
case Type.MESSAGE => WireFormat.FieldType.MESSAGE
case Type.GROUP => WireFormat.FieldType.GROUP
}).getWireType
// $COVERAGE-ON$
}