Any comments on the feasibility of this or other options to explore? Thank 
you.

On Wednesday, July 22, 2020 at 10:50:31 AM UTC-7 Ram wrote:

> Team gRPC,
>
> We've a scenario where a gRPC client sets up all the operations and does a 
> grpc_call_start_batch(), something like this:
>
>
> https://github.com/grpc/grpc/blob/master/test/core/end2end/tests/trailing_metadata.cc#L153
> memset(ops, 0, sizeof(ops));
> op = ops;
> op->op = GRPC_OP_SEND_INITIAL_METADATA;
> op->data.send_initial_metadata.count = 2;
> ....
> <snip>
> ......
> op->op = GRPC_OP_RECV_INITIAL_METADATA;
> op->data.recv_initial_metadata.recv_initial_metadata = 
> &initial_metadata_recv;
> op->flags = 0;
> op->reserved = nullptr;
> op++;
> op->op = GRPC_OP_RECV_MESSAGE;
> op->data.recv_message.recv_message = &response_payload_recv;
> op->flags = 0;
> op->reserved = nullptr;
> op++;
> ....
> <snip>
> ......
> error = grpc_call_start_batch(c, ops, static_cast<size_t>(op - ops), 
> tag(1),
> nullptr);
>
> GPR_ASSERT(GRPC_CALL_OK == error);
>
> In some scenarios, the server side sends only initial metadata whereas in 
> some other scenarios it sends a message as well along with initial metadata 
> and the client isn't aware of when one vs the other scenario happens.
>
> Is it possible to wake up client (i.e., event posted on the completion 
> queue) to respond to both scenarios? I tried digging around in test subdir, 
> couldn't find my scenario https://github.com/grpc/grpc/tree/master/test 
>
> Any pointers or alternative options on this will be of help, thank you!
>
> Best, -Ram.
>
>
>

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