Grpc：Grpc C++客户端和Grpc java服务器，异步双向流

Question

我试图为双向流API编写一个cpp客户端。

通过下面的客户端代码，我可以在服务器上实例化一个流观察器。但是，问题在于调用服务器StreamObserver上的onNext函数。

// A client-to-server stream RPC to append data
rpc append(stream ratis.common.RaftClientRequestProto)
  returns (stream ratis.common.RaftClientReplyProto) {}

@Override
public void onNext(RaftClientRequestProto request) {
  try {
    final RaftClientRequest r = ClientProtoUtils.toRaftClientRequest(request);
    LOG.info("recieved request " + r.getCallId());
    final PendingAppend p = new PendingAppend(r);
    slidingWindow.receivedRequest(p, this::processClientRequestAsync);
  } catch (Throwable e) {
    responseError(e, () -> "onNext for " + ClientProtoUtils.toString(request));
  }
}

    RaftClientRequestProto req = create_request(read_requet, sizeof(ContainerCommandRequestProto));
    grpc::ClientContext ctx;
    std::shared_ptr<ClientReaderWriter<RaftClientRequestProto, RaftClientReplyProto>> cli_stream(stub->append(&ctx));

    std::thread writer([cli_stream]() {
            RaftClientReplyProto resp;
    std::cout << "goind to read " << std::endl;
    cli_stream->Read(&resp);
    std::cout << "read done" << std::endl;
    });

    std::cout << "Thread started" << std::endl;
    std::this_thread::sleep_for(std::chrono::milliseconds(10000));
    std::cout << "Doing writes" << std::endl;
    cli_stream->Write(req);
    cli_stream->WritesDone();
    std::cout << "writes done" << std::endl;

Answer 1

这个问题是由于protobuf版本的差异造成的。