fix graceful shutdown to close once idle (#296)

tests/h2-support/src/mock.rs

@@ -364,6 +364,17 @@ impl AsyncWrite for Mock {
     }
 }
 
+impl Drop for Mock {
+    fn drop(&mut self) {
+        let mut me = self.pipe.inner.lock().unwrap();
+        me.closed = true;
+
+        if let Some(task) = me.tx_task.take() {
+            task.notify();
+        }
+    }
+}
+
 // ===== impl Pipe =====
 
 impl io::Read for Pipe {
@@ -375,7 +386,12 @@ impl io::Read for Pipe {
 
         let mut me = self.inner.lock().unwrap();
 
+
         if me.tx.is_empty() {
+            if me.closed {
+                return Ok(0);
+            }
+
             me.tx_task = Some(task::current());
             return Err(WouldBlock.into());
         }
@@ -442,7 +458,7 @@ pub trait HandleFutureExt {
             Box::new(map);
         RecvFrame {
             inner: boxed,
-            frame: settings.into().into(),
+            frame: Some(settings.into().into()),
         }
     }
 
@@ -460,7 +476,14 @@ pub trait HandleFutureExt {
         Self: IntoRecvFrame + Sized,
         T: Into<Frame>,
     {
-        self.into_recv_frame(frame.into())
+        self.into_recv_frame(Some(frame.into()))
+    }
+
+    fn recv_eof(self) -> RecvFrame<<Self as IntoRecvFrame>::Future>
+    where
+        Self: IntoRecvFrame + Sized,
+    {
+        self.into_recv_frame(None)
     }
 
     fn send_frame<T>(self, frame: T) -> SendFrameFut<Self>
@@ -623,7 +646,7 @@ pub trait HandleFutureExt {
 
 pub struct RecvFrame<T> {
     inner: T,
-    frame: Frame,
+    frame: Option<Frame>,
 }
 
 impl<T> Future for RecvFrame<T>
@@ -642,10 +665,8 @@ where
             Async::NotReady => return Ok(Async::NotReady),
         };
 
-        let frame = frame.unwrap();
-
         match (frame, &self.frame) {
-            (Data(ref a), &Data(ref b)) => {
+            (Some(Data(ref a)), &Some(Data(ref b))) => {
                 assert_eq!(a.payload().len(), b.payload().len(), "recv_frame data payload len");
                 assert_eq!(a, b, "recv_frame");
             }
@@ -712,13 +733,13 @@ where
 
 pub trait IntoRecvFrame {
     type Future: Future;
-    fn into_recv_frame(self, frame: Frame) -> RecvFrame<Self::Future>;
+    fn into_recv_frame(self, frame: Option<Frame>) -> RecvFrame<Self::Future>;
 }
 
 impl IntoRecvFrame for Handle {
     type Future = ::futures::stream::StreamFuture<Self>;
 
-    fn into_recv_frame(self, frame: Frame) -> RecvFrame<Self::Future> {
+    fn into_recv_frame(self, frame: Option<Frame>) -> RecvFrame<Self::Future> {
         RecvFrame {
             inner: self.into_future(),
             frame: frame,
@@ -733,7 +754,7 @@ where
 {
     type Future = Box<Future<Item = (Option<Frame>, Handle), Error = ()>>;
 
-    fn into_recv_frame(self, frame: Frame) -> RecvFrame<Self::Future> {
+    fn into_recv_frame(self, frame: Option<Frame>) -> RecvFrame<Self::Future> {
         let into_fut = Box::new(
             self.unwrap()
                 .and_then(|handle| handle.into_future().unwrap()),

tests/h2-tests/tests/server.rs

@@ -268,7 +268,7 @@ fn graceful_shutdown() {
         .send_frame(frames::data(7, "").eos())
         .send_frame(frames::data(3, "").eos())
         .recv_frame(frames::headers(3).response(200).eos())
-        .close(); //TODO: closed()?
+        .recv_eof();
 
     let srv = server::handshake(io)
         .expect("handshake")