src/cpp/client/client_unary_call.cc

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#include <grpc++/impl/client_unary_call.h>
#include <grpc++/impl/call.h>
#include <grpc++/channel_interface.h>
#include <grpc++/client_context.h>
#include <grpc++/completion_queue.h>
#include <grpc++/status.h>
#include <grpc/support/log.h>

namespace grpc {

// Wrapper that performs a blocking unary call
Status BlockingUnaryCall(ChannelInterface *channel, const RpcMethod &method,
                         ClientContext *context,
                         const google::protobuf::Message &request,
                         google::protobuf::Message *result) {
  CompletionQueue cq;
  Call call(channel->CreateCall(method, context, &cq));
  CallOpBuffer buf;
  Status status;
  buf.AddSendInitialMetadata(context);
  buf.AddSendMessage(request);
  buf.AddRecvInitialMetadata(context);
  buf.AddRecvMessage(result);
  buf.AddClientSendClose();
  buf.AddClientRecvStatus(context, &status);
  call.PerformOps(&buf);
  GPR_ASSERT((cq.Pluck(&buf) && buf.got_message) || !status.IsOk());
  return status;
}

class ClientAsyncRequest final : public CallOpBuffer {
 public:
  void FinalizeResult(void **tag, bool *status) override {
    CallOpBuffer::FinalizeResult(tag, status);
    delete this;
  }
};

void AsyncUnaryCall(ChannelInterface *channel, const RpcMethod &method,
                    ClientContext *context,
                    const google::protobuf::Message &request,
                    google::protobuf::Message *result, Status *status,
                    CompletionQueue *cq, void *tag) {
  ClientAsyncRequest *buf = new ClientAsyncRequest;
  buf->Reset(tag);
  Call call(channel->CreateCall(method, context, cq));
  buf->AddSendInitialMetadata(context);
  buf->AddSendMessage(request);
  buf->AddRecvInitialMetadata(context);
  buf->AddRecvMessage(result);
  buf->AddClientSendClose();
  buf->AddClientRecvStatus(context, status);
  call.PerformOps(buf);
}

}  // namespace grpc