http-service-hyper: Make serve return a Future

http-service-hyper/src/lib.rs

@@ -78,18 +78,21 @@ where
     }
 }
 
-/// Serve the given `HttpService` at the given address, using `hyper` as backend.
-pub fn serve<S: HttpService>(s: S, addr: SocketAddr) {
+/// Serve the given `HttpService` at the given address, using `hyper` as backend, and return a
+/// `Future` that can be `await`ed on.
+pub fn serve<S: HttpService>(
+    s: S,
+    addr: SocketAddr,
+) -> impl Future<Output = Result<(), hyper::Error>> {
     let service = WrapHttpService {
         service: Arc::new(s),
     };
-    let server = hyper::Server::bind(&addr)
-        .serve(service)
-        .compat()
-        .map(|_| {
-            let res: Result<(), ()> = Ok(());
-            res
-        })
-        .compat();
+    hyper::Server::bind(&addr).serve(service).compat()
+}
+
+/// Run the given `HttpService` at the given address on the default runtime, using `hyper` as
+/// backend.
+pub fn run<S: HttpService>(s: S, addr: SocketAddr) {
+    let server = serve(s, addr).map(|_| Result::<_, ()>::Ok(())).compat();
     hyper::rt::run(server);
 }