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 grpc::protobuf::Message& request,
                         grpc::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.ok());
  return status;
}

}  // namespace grpc