Deserialize Protobuf content using compiled descriptor schema with Groovy

protobuf-deserialize.groovy

@Grapes([
    @Grab(group='com.google.protobuf', module='protobuf-java', version='3.8.0'),
    @Grab(group='com.google.protobuf', module='protobuf-java-util', version='3.8.0'),
])
import com.google.protobuf.DescriptorProtos
import com.google.protobuf.Descriptors
import com.google.protobuf.DynamicMessage
import com.google.protobuf.util.JsonFormat
import java.io.FileInputStream
import java.nio.file.Files
import java.nio.file.Paths

byte[] data = Files.readAllBytes(Paths.get("data.bin"))
FileInputStream schema = new FileInputStream('schema.desc')
DescriptorProtos.FileDescriptorSet fds = DescriptorProtos.FileDescriptorSet.parseFrom(schema)
schema.close()
DescriptorProtos.FileDescriptorProto fdp = fds.fileList[0]
Descriptors.FileDescriptor[] deps = new Descriptors.FileDescriptor[0]
Descriptors.FileDescriptor fDesc = Descriptors.FileDescriptor.buildFrom(fdp, deps)
Descriptors.Descriptor desc = fDesc.findMessageTypeByName('WriteRequest')
DynamicMessage message = DynamicMessage.parseFrom(desc, data)

JsonFormat.Printer printer = JsonFormat.printer()

println printer.print(message)