小编Rid*_*hod的帖子

我正在尝试做类似下面的事情（即使用流式grpc调用将数据从客户端发送到服务器）。代码参考取自官方网站上给出的grpc示例，用于解释目的：

客户端代码：

ClientContext context;
context.AddMetadata("authorization", "abcd");
context.set_deadline(...);

std::unique_ptr<ClientWriter<RequestObjectClass>> writer(stub_->grpcCall(&context, &response));
writer->WaitForInitialMetadata();

// Setting request parameters
request.set...(...);
request.set...(...);
request.set...(...);
request.set...(...);

if (!writer->Write(request)) {
    Status status = writer->Finish();
    if (status.error_code() == UNAUTHENTICATED) {
        std::cout << "UNAUTHORIZED" << std::endl;
        break;
    }

    // Broken stream.
    throw Exception("Broken Stream");
}

writer->WritesDone();
Status status = writer->Finish();
if (status.ok()) {
    std::cout << "RPC succeeded." << std::endl;
} else {
    std::cout << "RPC failed." << std::endl;
}

服务器端代码：

std::multimap<grpc::string_ref, grpc::string_ref> metadata = context->client_metadata();
auto auth = metadata.find("authorization");

if …