Zhukov is a library for marshaling Scala types in Google Protocol Buffers format without writing .proto files. Unlike other Protocol Buffers libraries, Zhukov doesn't depend on com.google.protobuf : protobuf-java. It means that you can use desirable implementation of byte sequence without conversion from com.google.protobuf.ByteString. Zhukov has written using pure Scala macros without generic programming. It's fast in compile time and runtime.
- Case classes to messages
- Default case class parameters
- Sealed traits to messages with
oneof - Autoderivation
- Recursive types
- Polymorphic messages (when the value of the type parameter known only in runtime).
- Code generator for
.protofiles. - gRPC services
- Optional code generation from
.protofiles.
import zhukov.derivation.auto._
import zhukov.{Marshaller, Unmarshaller}
case class SimpleMessage(myNumber: Int = 0, myString: String = "")
val message = SimpleMessage(42, "cow")
Marshaller[SimpleMessage].write(message)import zhukov.Bytes
import com.google.protobuf.ByteString
implicit object ByteStringBytes extends Bytes[ByteString] {
def empty: ByteString = ByteString.EMPTY
def copyFromArray(bytes: Array[Byte]): ByteString = ByteString.copyFrom(bytes)
def copyFromArray(bytes: Array[Byte], offset: Long, size: Long): ByteString = ByteString.copyFrom(bytes, offset.toInt, size.toInt)
def copyToArray(value: ByteString, array: Array[Byte], sourceOffset: Int, targetOffset: Int, length: Int): Unit = value.copyTo(array, sourceOffset, targetOffset, length)
def wrapArray(bytes: Array[Byte]): ByteString = ByteString.copyFrom(bytes)
def copyBuffer(buffer: ByteBuffer): ByteString = ByteString.copyFrom(buffer)
def toArray(bytes: ByteString): Array[Byte] = bytes.toByteArray
def toBuffer(bytes: ByteString): ByteBuffer = bytes.asReadOnlyByteBuffer()
def get(bytes: ByteString, i: Long): Int = bytes.byteAt(i.toInt)
def size(bytes: ByteString): Long = bytes.size().toLong
def concat(left: ByteString, right: ByteString): ByteString = left.concat(right)
def slice(value: ByteString, start: Long, end: Long): ByteString = value.substring(start.toInt, end.toInt)
}
