fix(client): check conn is closed in expire interval

src/client/pool.rs

@@ -21,8 +21,8 @@ pub struct Pool<T> {
 // This is a trait to allow the `client::pool::tests` to work for `i32`.
 //
 // See https://github.com/hyperium/hyper/issues/1429
-pub trait Ready {
-    fn poll_ready(&mut self) -> Poll<(), ()>;
+pub trait Closed {
+    fn is_closed(&self) -> bool;
 }
 
 struct PoolInner<T> {
@@ -49,7 +49,7 @@ struct PoolInner<T> {
     expired_timer_spawned: bool,
 }
 
-impl<T: Clone + Ready> Pool<T> {
+impl<T: Clone + Closed> Pool<T> {
     pub fn new(enabled: bool, timeout: Option<Duration>) -> Pool<T> {
         Pool {
             inner: Rc::new(RefCell::new(PoolInner {
@@ -117,10 +117,10 @@ impl<T: Clone + Ready> Pool<T> {
             let mut should_remove = false;
             let entry = inner.idle.get_mut(key).and_then(|list| {
                 trace!("take; url = {:?}, expiration = {:?}", key, expiration.0);
-                while let Some(mut entry) = list.pop() {
+                while let Some(entry) = list.pop() {
                     match entry.status.get() {
                         TimedKA::Idle(idle_at) if !expiration.expires(idle_at) => {
-                            if let Ok(Async::Ready(())) = entry.value.poll_ready() {
+                            if !entry.value.is_closed() {
                                 should_remove = list.is_empty();
                                 return Some(entry);
                             }
@@ -202,7 +202,9 @@ impl<T> Pool<T> {
             inner.parked.remove(key);
         }
     }
+}
 
+impl<T: Closed> Pool<T> {
     fn clear_expired(&self) {
         let mut inner = self.inner.borrow_mut();
 
@@ -218,6 +220,9 @@ impl<T> Pool<T> {
         inner.idle.retain(|_key, values| {
 
             values.retain(|val| {
+                if val.value.is_closed() {
+                    return false;
+                }
                 match val.status.get() {
                     TimedKA::Idle(idle_at) if now - idle_at < dur => {
                         true
@@ -234,7 +239,7 @@ impl<T> Pool<T> {
 }
 
 
-impl<T: 'static> Pool<T> {
+impl<T: Closed + 'static> Pool<T> {
     pub(super) fn spawn_expired_interval(&self, handle: &Handle) {
         let mut inner = self.inner.borrow_mut();
 
@@ -296,7 +301,7 @@ impl<T> DerefMut for Pooled<T> {
     }
 }
 
-impl<T: Clone + Ready> KeepAlive for Pooled<T> {
+impl<T: Clone + Closed> KeepAlive for Pooled<T> {
     fn busy(&mut self) {
         self.entry.status.set(TimedKA::Busy);
     }
@@ -347,7 +352,7 @@ impl<T> fmt::Debug for Pooled<T> {
     }
 }
 
-impl<T: Clone + Ready> BitAndAssign<bool> for Pooled<T> {
+impl<T: Clone + Closed> BitAndAssign<bool> for Pooled<T> {
     fn bitand_assign(&mut self, enabled: bool) {
         if !enabled {
             self.disable();
@@ -377,13 +382,13 @@ pub struct Checkout<T> {
 
 struct NotParked;
 
-impl<T: Clone + Ready> Checkout<T> {
+impl<T: Clone + Closed> Checkout<T> {
     fn poll_parked(&mut self) -> Poll<Pooled<T>, NotParked> {
         let mut drop_parked = false;
         if let Some(ref mut rx) = self.parked {
             match rx.poll() {
                 Ok(Async::Ready(mut entry)) => {
-                    if let Ok(Async::Ready(())) = entry.value.poll_ready() {
+                    if !entry.value.is_closed() {
                         return Ok(Async::Ready(self.pool.reuse(&self.key, entry)));
                     }
                     drop_parked = true;
@@ -408,7 +413,7 @@ impl<T: Clone + Ready> Checkout<T> {
     }
 }
 
-impl<T: Clone + Ready> Future for Checkout<T> {
+impl<T: Clone + Closed> Future for Checkout<T> {
     type Item = Pooled<T>;
     type Error = io::Error;
 
@@ -456,7 +461,7 @@ struct IdleInterval<T> {
     pool: Weak<RefCell<PoolInner<T>>>,
 }
 
-impl<T: 'static> Future for IdleInterval<T> {
+impl<T: Closed + 'static> Future for IdleInterval<T> {
     type Item = ();
     type Error = ();
 
@@ -478,14 +483,14 @@ impl<T: 'static> Future for IdleInterval<T> {
 mod tests {
     use std::rc::Rc;
     use std::time::Duration;
-    use futures::{Async, Future, Poll};
+    use futures::{Async, Future};
     use futures::future;
     use proto::KeepAlive;
-    use super::{Ready, Pool};
+    use super::{Closed, Pool};
 
-    impl Ready for i32 {
-        fn poll_ready(&mut self) -> Poll<(), ()> {
-            Ok(Async::Ready(()))
+    impl Closed for i32 {
+        fn is_closed(&self) -> bool {
+            false
         }
     }