docs(examples): update single_threaded example to async/await

examples/single_threaded.rs

@@ -0,0 +1,55 @@
+#![feature(async_await)]
+#![deny(warnings)]
+
+use std::cell::Cell;
+use std::rc::Rc;
+
+use hyper::{Body, Error, Response, Server};
+use hyper::service::{make_service_fn, service_fn};
+use tokio::runtime::current_thread;
+
+// Configure a runtime that runs everything on the current thread,
+// which means it can spawn !Send futures...
+#[hyper::rt::main(single_thread)]
+async fn main() {
+    pretty_env_logger::init();
+
+    let addr = ([127, 0, 0, 1], 3000).into();
+
+    // Using a !Send request counter is fine on 1 thread...
+    let counter = Rc::new(Cell::new(0));
+
+    let make_service = make_service_fn(move |_| {
+        // For each connection, clone the counter to use in our service...
+        let cnt = counter.clone();
+
+        async move {
+            Ok::<_, Error>(service_fn(move |_| {
+                let prev = cnt.get();
+                cnt.set(prev + 1);
+                let value = cnt.get();
+                async move {
+                    Ok::<_, Error>(Response::new(Body::from(
+                        format!("Request #{}", value)
+                    )))
+                }
+            }))
+        }
+    });
+
+    // Since the Server needs to spawn some background tasks, we needed
+    // to configure an Executor that can spawn !Send futures...
+    let exec = current_thread::TaskExecutor::current();
+
+    let server = Server::bind(&addr)
+        .executor(exec)
+        .serve(make_service);
+
+    println!("Listening on http://{}", addr);
+
+    // The server would block on current thread to await !Send futures.
+    if let Err(e) = server.await {
+        eprintln!("server error: {}", e);
+    }
+}
+

examples_disabled/single_threaded.rs

@@ -1,51 +0,0 @@
-#![deny(warnings)]
-extern crate futures;
-extern crate hyper;
-extern crate pretty_env_logger;
-extern crate tokio;
-
-use std::cell::Cell;
-use std::rc::Rc;
-
-use hyper::{Body, Response, Server};
-use hyper::service::service_fn_ok;
-use hyper::rt::Future;
-use tokio::runtime::current_thread;
-
-fn main() {
-    pretty_env_logger::init();
-
-    let addr = ([127, 0, 0, 1], 3000).into();
-
-    // Using a !Send request counter is fine on 1 thread...
-    let counter = Rc::new(Cell::new(0));
-
-    let new_service = move || {
-        // For each connection, clone the counter to use in our service...
-        let cnt = counter.clone();
-
-        service_fn_ok(move |_| {
-            let prev = cnt.get();
-            cnt.set(prev + 1);
-            Response::new(Body::from(format!("Request count: {}", prev + 1)))
-        })
-    };
-
-    // Since the Server needs to spawn some background tasks, we needed
-    // to configure an Executor that can spawn !Send futures...
-    let exec = current_thread::TaskExecutor::current();
-
-    let server = Server::bind(&addr)
-        .executor(exec)
-        .serve(new_service)
-        .map_err(|e| eprintln!("server error: {}", e));
-
-    println!("Listening on http://{}", addr);
-
-    current_thread::Runtime::new()
-        .expect("rt new")
-        .spawn(server)
-        .run()
-        .expect("rt run");
-}
-