C++ async call data deletion

[nic...@verbsurgical.com]

Hi,

I have a question about the behavior of gRPC C++ async; If the call data is deleted in the middle of a call, for example, in a server streaming call, where call data is:

struct CallData {

  grpc::ServerContext ctx;

  RpcRequest request;

  grpc::ServerAsyncWriter<RpcResponse> response_writer;

}

Is the behavor defined if this call data is deleted before calling response_writer.Finish(...) and receiving the returned tag.  Ie. the from a previous call to response_writer.Write(...) was returned, but before invoking Finish(), the CallData is deleted.  My assumption is that the call would be cancelled and the client would receive an error.  But should we expect to see gRPC assertion failures on the server side during cleanup, or should the server still be able to process additional requests, and shutdown cleanly?

Thanks!

Nick

[Vijay Pai]

The ServerContext needs to stay alive for the duration of the RPC.

[Nick Cox]

Is the behavior undefined if it doesn't?

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[Vijay Pai]

Yes, it's an API expectation that ServerContext is alive for the duration of the RPC and there is no guaranteed behavior otherwise.

[Nick Cox]

Thanks, that clarification helps.  For call duration, is the end of the call defined as when Finish() is invoked, or when the tag is returned from the completion queue after the call to Finish()?  I suspect it's the latter, but I just want to confirm.

Thanks!

Nick

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[Vijay Pai]

Yup, it is over when the tag comes back from finish

[Nick Cox]

Thanks!

On Tue, Mar 19, 2019, 12:11 PM 'Vijay Pai' via grpc.io <grp...@googlegroups.com> wrote:

Yup, it is over when the tag comes back from finish

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