More async macro

tonic/src/lib.rs

@@ -2,13 +2,13 @@ pub use tower_grpc::*;
 
 use std::future::Future;
 use std::pin::Pin;
+use std::sync::Arc;
 
 pub type ResponseFuture<'a, T> = Pin<Box<dyn Future<Output = Result<T, Status>> + Send + 'a>>;
 
 pub trait GrpcInnerService<Request> {
     type Response;
+    type Future: Future<Output = Result<Self::Response, Status>>;
 
-    fn call<'a>(&'a mut self, request: Request) -> ResponseFuture<'a, Self::Response>
-    where
-        Self: 'a;
+    fn call(self: Arc<Self>, request: Request) -> Self::Future;
 }