Single threaded server example with `async_trait(?Send)`

[cavemanloverboy]

There are zero examples of anything using #[tonic::async_trait(?Send)]. Can we fix this?

I'm having trouble trying to build a single-threaded server using tokio's current_thread runtime because the autogenerated traits for the service have Send + Sync

[harry0349]

It seems that the single-threaded server is not implemented.

tonic/tonic-build/src/server.rs

Line 224 in 78be69e

pub trait #server_trait : std::marker::Send + std::marker::Sync + 'static {

[Eclextic]

I also am interested. Using tonic is so horrible when you want to use a different async framework like monoio that doesn't require Send.