由scalapb生成的proto中的未知字段

Question

我对刀刀和原始人很陌生。

我试着为我的刀刀的发电机创建单元测试。我已经生成了proto文件，并试图在测试中使用它们。

我有这个proto文件：

syntax = "proto3";

package hellogrpc.calc;

import "google/api/annotations.proto";

option (scalapb.options) = {
  flat_package: true
};

service CalcService {

    rpc CalcSum (SumRequest) returns (CalcResponse) {
        option (google.api.http) = {
          post: "/calcService/sum"
          body: "*"
        };
    }

}

有一个方法CalcSum被注释。

以及相应生成的proto文件：

// Generated by the Scala Plugin for the Protocol Buffer Compiler.
// Do not edit!
//
// Protofile syntax: PROTO3

package hellogrpc.calc



object CalcServiceProto extends _root_.com.trueaccord.scalapb.GeneratedFileObject {
  lazy val dependencies: Seq[_root_.com.trueaccord.scalapb.GeneratedFileObject] = Seq(
    com.trueaccord.scalapb.scalapb.ScalapbProto,
    com.google.api.annotations.AnnotationsProto
  )
  lazy val messagesCompanions: Seq[_root_.com.trueaccord.scalapb.GeneratedMessageCompanion[_]] = Seq(
    hellogrpc.calc.SumRequest,
    hellogrpc.calc.CalcResponse
  )
  private lazy val ProtoBytes: Array[Byte] =
      com.trueaccord.scalapb.Encoding.fromBase64(scala.collection.Seq(
  """ChtoZWxsb2dycGMvQ2FsY1NlcnZpY2UucHJvdG8SDmhlbGxvZ3JwYy5jYWxjGhVzY2FsYXBiL3NjYWxhcGIucHJvdG8aHGdvb
  2dsZS9hcGkvYW5ub3RhdGlvbnMucHJvdG8iKAoKU3VtUmVxdWVzdBIMCgFhGAEgASgFUgFhEgwKAWIYAiABKAVSAWIiJgoMQ2FsY
  1Jlc3BvbnNlEhYKBnJlc3VsdBgBIAEoBVIGcmVzdWx0Mm8KC0NhbGNTZXJ2aWNlEmAKB0NhbGNTdW0SGi5oZWxsb2dycGMuY2FsY
  y5TdW1SZXF1ZXN0GhwuaGVsbG9ncnBjLmNhbGMuQ2FsY1Jlc3BvbnNlIhuC0+STAhUiEC9jYWxjU2VydmljZS9zdW06ASpCBeI/A
  hABYgZwcm90bzM="""
      ).mkString)
  lazy val scalaDescriptor: _root_.scalapb.descriptors.FileDescriptor = {
    val scalaProto = com.google.protobuf.descriptor.FileDescriptorProto.parseFrom(ProtoBytes)
    _root_.scalapb.descriptors.FileDescriptor.buildFrom(scalaProto, dependencies.map(_.scalaDescriptor))
  }
  lazy val javaDescriptor: com.google.protobuf.Descriptors.FileDescriptor = {
    val javaProto = com.google.protobuf.DescriptorProtos.FileDescriptorProto.parseFrom(ProtoBytes)
    com.google.protobuf.Descriptors.FileDescriptor.buildFrom(javaProto, Array(
      com.trueaccord.scalapb.scalapb.ScalapbProto.javaDescriptor,
      com.google.api.annotations.AnnotationsProto.javaDescriptor
    ))
  }
  @deprecated("Use javaDescriptor instead. In a future version this will refer to scalaDescriptor.", "ScalaPB 0.5.47")
  def de
```scriptor: com.google.protobuf.Descriptors.FileDescriptor = javaDescriptor

}

I inspect CalcServiceProto.javaDescriptor in intellj idea:

​

![](https://developer.qcloudimg.com/http-save/yehe-900000/f00c83ad33a9aff60474063cb89cfdcd.png)

​

Method descriptor has this proto definition:

```javascript

名称："CalcSum“

input_type：".hellogrpc.calc.SumRequest“

output_type：".hellogrpc.calc.CalcResponse“

选项{

72295728：“\\”\020/calcService/sum：\001*“

}

But generator works just fine! I debug generator, toggled breakpoint on generator and method CalcSum has this proto definition:

```javascript

名称："CalcSum“

input_type：".hellogrpc.calc.SumRequest“

output_type：".hellogrpc.calc.CalcResponse“

选项{

google.api.http {

post: "/calcService/sum"

body: "*"

}

}

May be this works differently because i didn't register extensions like generator do.

Any way i want this test to be passed:

```javascript

val = CalcServiceProto.javaDescriptor.getServices.get(0)

val = s.getMethods.get(0)

m.getOptions.getExtension(AnnotationsProto.http).getPost shouldBe“/煅烧服务/sum”

Answer 1

如果需要Java扩展可用，则需要在启用Java转换的情况下生成代码。这将使javaDescriptor依赖于官方的Java实现，您的测试将通过。

当禁用Java转换时，ScalaPB解析描述符，但它不能保证编译了Java扩展，因此它不会尝试注册它们。

我想要的是Scala描述符在这种情况下可以工作，但是它们还不支持服务和方法。我注册了https://github.com/scalapb/ScalaPB/issues/382来跟踪这方面的进展。

同时，正如我前面所写的，您可以使用java转换来强制ScalaPB为您提供Java描述符。在您的build.sbt中，有：

PB.targets in Compile := Seq(
  scalapb.gen(grpc=true, javaConversions=true) -> (sourceManaged in Compile).value,
  PB.gens.java -> (sourceManaged in Compile).value
)