feat(server): Allow keep alive to be turned off for a connection

Closes hyperium#1365

Author: sfackler

Diff for: src/proto/conn.rs

@@ -453,6 +453,10 @@ where I: AsyncRead + AsyncWrite,
     pub fn close_write(&mut self) {
         self.state.close_write();
     }
+
+    pub fn disable_keep_alive(&mut self) {
+        self.state.disable_keep_alive();
+    }
 }
 
 // ==== tokio_proto impl ====
@@ -700,6 +704,10 @@ impl<B, K: KeepAlive> State<B, K> {
         }
     }
 
+    fn disable_keep_alive(&mut self) {
+        self.keep_alive.disable()
+    }
+
     fn busy(&mut self) {
         if let KA::Disabled = self.keep_alive.status() {
             return;
@@ -869,7 +877,7 @@ mod tests {
                 other => panic!("unexpected frame: {:?}", other)
             }
 
-            // client 
+            // client
             let io = AsyncIo::new_buf(vec![], 1);
             let mut conn = Conn::<_, proto::Chunk, ClientTransaction>::new(io, Default::default());
             conn.state.busy();

Diff for: src/proto/dispatch.rs

@@ -54,6 +54,10 @@ where
         }
     }
 
+    pub fn disable_keep_alive(&mut self) {
+        self.conn.disable_keep_alive()
+    }
+
     fn poll_read(&mut self) -> Poll<(), ::Error> {
         loop {
             if self.conn.can_read_head() {

Diff for: src/server/mod.rs

@@ -536,6 +536,18 @@ where
     }
 }
 
+impl<I, B, S> Connection<I, S>
+where S: Service<Request = Request, Response = Response<B>, Error = ::Error> + 'static,
+      I: AsyncRead + AsyncWrite + 'static,
+      B: Stream<Error=::Error> + 'static,
+      B::Item: AsRef<[u8]>,
+{
+    /// Disables keep-alive for this connection.
+    pub fn disable_keep_alive(&mut self) {
+        self.conn.disable_keep_alive()
+    }
+}
+
 mod unnameable {
     // This type is specifically not exported outside the crate,
     // so no one can actually name the type. With no methods, we make no

Diff for: tests/server.rs

@@ -6,7 +6,7 @@ extern crate pretty_env_logger;
 extern crate tokio_core;
 
 use futures::{Future, Stream};
-use futures::future::{self, FutureResult};
+use futures::future::{self, FutureResult, Either};
 use futures::sync::oneshot;
 
 use tokio_core::net::TcpListener;
@@ -551,6 +551,50 @@ fn pipeline_enabled() {
     assert_eq!(n, 0);
 }
 
+#[test]
+fn disable_keep_alive_mid_request() {
+    let mut core = Core::new().unwrap();
+    let listener = TcpListener::bind(&"127.0.0.1:0".parse().unwrap(), &core.handle()).unwrap();
+    let addr = listener.local_addr().unwrap();
+
+    let (tx1, rx1) = oneshot::channel();
+    let (tx2, rx2) = oneshot::channel();
+
+    let child = thread::spawn(move || {
+        let mut req = connect(&addr);
+        req.write_all(b"GET / HTTP/1.1\r\nConnection: keep-alive\r\n").unwrap();
+        tx1.send(()).unwrap();
+        rx2.wait().unwrap();
+        req.write_all(b"Host: localhost\r\nContent-Length: 0\r\n\r\n").unwrap();
+        let mut buf = vec![];
+        req.read_to_end(&mut buf).unwrap();
+    });
+
+    let fut = listener.incoming()
+        .into_future()
+        .map_err(|_| unreachable!())
+        .and_then(|(item, _incoming)| {
+            let (socket, _) = item.unwrap();
+            Http::<hyper::Chunk>::new().serve_connection(socket, HelloWorld)
+                .select2(rx1)
+                .then(|r| {
+                    match r {
+                        Ok(Either::A(_)) => panic!("expected rx first"),
+                        Ok(Either::B(((), mut conn))) => {
+                            conn.disable_keep_alive();
+                            tx2.send(()).unwrap();
+                            conn
+                        }
+                        Err(Either::A((e, _))) => panic!("unexpected error {}", e),
+                        Err(Either::B((e, _))) => panic!("unexpected error {}", e),
+                    }
+                })
+        });
+
+    core.run(fut).unwrap();
+    child.join().unwrap();
+}
+
 #[test]
 fn no_proto_empty_parse_eof_does_not_return_error() {
     let mut core = Core::new().unwrap();