Clarify serialization traits interface

1 files changed, 3 insertions, 4 deletions

diff --git a/include/grpc++/async_unary_call.h b/include/grpc++/async_unary_call.h
index a3c9e20213..911092b70e 100644
--- a/include/grpc++/async_unary_call.h
+++ b/include/grpc++/async_unary_call.h
@@ -64,7 +64,7 @@ class ClientAsyncResponseReader GRPC_FINAL
       : context_(context), call_(channel->CreateCall(method, context, cq)) {
     init_buf_.SendInitialMetadata(context->send_initial_metadata_);
     // TODO(ctiller): don't assert
-    GPR_ASSERT(init_buf_.SendMessage(request));
+    GPR_ASSERT(init_buf_.SendMessage(request).IsOk());
     init_buf_.ClientSendClose();
     call_.PerformOps(&init_buf_);
   }
@@ -120,10 +120,9 @@ class ServerAsyncResponseWriter GRPC_FINAL
       ctx_->sent_initial_metadata_ = true;
     }
     // The response is dropped if the status is not OK.
-    if (status.IsOk() && !finish_buf_.SendMessage(msg)) {
+    if (status.IsOk()) {
       finish_buf_.ServerSendStatus(
-          ctx_->trailing_metadata_,
-          Status(INVALID_ARGUMENT, "Failed to serialize message"));
+          ctx_->trailing_metadata_, finish_buf_.SendMessage(msg));
     } else {
       finish_buf_.ServerSendStatus(ctx_->trailing_metadata_, status);
     }