Update buffer service (#452)

ntex-service/src/and_then.rs

@@ -93,7 +93,7 @@ mod tests {
 
     use crate::{chain, chain_factory, fn_factory, Service, ServiceCtx};
 
-    #[derive(Clone)]
+    #[derive(Debug, Clone)]
     struct Srv1(Rc<Cell<usize>>, Rc<Cell<usize>>);
 
     impl Service<&'static str> for Srv1 {
@@ -123,7 +123,7 @@ mod tests {
         }
     }
 
-    #[derive(Clone)]
+    #[derive(Debug, Clone)]
     struct Srv2(Rc<Cell<usize>>, Rc<Cell<usize>>);
 
     impl Service<&'static str> for Srv2 {
@@ -157,12 +157,10 @@ mod tests {
     async fn test_ready() {
         let cnt = Rc::new(Cell::new(0));
         let cnt_sht = Rc::new(Cell::new(0));
-        let srv = Box::new(
-            chain(Srv1(cnt.clone(), cnt_sht.clone()))
-                .and_then(Srv2(cnt.clone(), cnt_sht.clone()))
-                .clone(),
-        )
-        .into_pipeline();
+        let srv = chain(Box::new(Srv1(cnt.clone(), cnt_sht.clone())))
+            .clone()
+            .and_then(crate::boxed::service(Srv2(cnt.clone(), cnt_sht.clone())))
+            .into_pipeline();
         let res = srv.ready().await;
         assert_eq!(res, Ok(()));
         assert_eq!(cnt.get(), 2);
@@ -176,6 +174,8 @@ mod tests {
 
         srv.shutdown().await;
         assert_eq!(cnt_sht.get(), 2);
+
+        assert!(format!("{:?}", srv).contains("AndThen"));
     }
 
     #[ntex::test]
@@ -194,11 +194,9 @@ mod tests {
     #[ntex::test]
     async fn test_call() {
         let cnt = Rc::new(Cell::new(0));
-        let srv = Box::new(
-            chain(Srv1(cnt.clone(), Rc::new(Cell::new(0))))
-                .and_then(Srv2(cnt, Rc::new(Cell::new(0)))),
-        )
-        .into_pipeline();
+        let srv = chain(Box::new(Srv1(cnt.clone(), Rc::new(Cell::new(0)))))
+            .and_then(Srv2(cnt, Rc::new(Cell::new(0))))
+            .into_pipeline();
         let res = srv.call("srv1").await;
         assert!(res.is_ok());
         assert_eq!(res.unwrap(), ("srv1", "srv2"));

ntex-util/src/future/mod.rs

@@ -28,6 +28,8 @@ where
     poll_fn(|cx| Pin::new(&mut *stream).poll_next(cx)).await
 }
 
+#[doc(hidden)]
+#[deprecated]
 /// A future that completes after the given item has been fully processed
 /// into the sink, including flushing.
 pub async fn sink_write<S, I>(sink: &mut S, item: I) -> Result<(), S::Error>

ntex-util/src/services/buffer.rs

@@ -1,6 +1,6 @@
 //! Service that buffers incomming requests.
 use std::cell::{Cell, RefCell};
-use std::task::{ready, Poll};
+use std::task::{ready, Poll, Waker};
 use std::{collections::VecDeque, fmt, future::poll_fn, marker::PhantomData};
 
 use ntex_service::{Middleware, Pipeline, PipelineBinding, Service, ServiceCtx};
@@ -70,11 +70,13 @@ where
     fn create(&self, service: S) -> Self::Service {
         BufferService {
             service: Pipeline::new(service).bind(),
+            service_pending: Cell::new(true),
             size: self.buf_size,
             ready: Cell::new(false),
             buf: RefCell::new(VecDeque::with_capacity(self.buf_size)),
             next_call: RefCell::default(),
             cancel_on_shutdown: self.cancel_on_shutdown,
+            readiness: Cell::new(None),
             _t: PhantomData,
         }
     }
@@ -111,10 +113,12 @@ impl<E: std::fmt::Display + std::fmt::Debug> std::error::Error for BufferService
 pub struct BufferService<R, S: Service<R>> {
     size: usize,
     ready: Cell<bool>,
+    service_pending: Cell<bool>,
     service: PipelineBinding<S, R>,
     buf: RefCell<VecDeque<oneshot::Sender<oneshot::Sender<()>>>>,
     next_call: RefCell<Option<oneshot::Receiver<()>>>,
     cancel_on_shutdown: bool,
+    readiness: Cell<Option<Waker>>,
     _t: PhantomData<R>,
 }
 
@@ -127,10 +131,12 @@ where
         Self {
             size,
             service: Pipeline::new(service).bind(),
+            service_pending: Cell::new(true),
             ready: Cell::new(false),
             buf: RefCell::new(VecDeque::with_capacity(size)),
             next_call: RefCell::default(),
             cancel_on_shutdown: false,
+            readiness: Cell::new(None),
             _t: PhantomData,
         }
     }
@@ -152,9 +158,11 @@ where
             size: self.size,
             ready: Cell::new(false),
             service: self.service.clone(),
+            service_pending: Cell::new(false),
             buf: RefCell::new(VecDeque::with_capacity(self.size)),
             next_call: RefCell::default(),
             cancel_on_shutdown: self.cancel_on_shutdown,
+            readiness: Cell::new(None),
             _t: PhantomData,
         }
     }
@@ -170,6 +178,7 @@ where
             .field("cancel_on_shutdown", &self.cancel_on_shutdown)
             .field("ready", &self.ready)
             .field("service", &self.service)
+            .field("service_pending", &self.service_pending)
             .field("buf", &self.buf)
             .field("next_call", &self.next_call)
             .finish()
@@ -185,58 +194,79 @@ where
     type Error = BufferServiceError<S::Error>;
 
     async fn ready(&self, _: ServiceCtx<'_, Self>) -> Result<(), Self::Error> {
+        // hold advancement until the last released task either makes a call or is dropped
+        let next_call = self.next_call.borrow_mut().take();
+        if let Some(next_call) = next_call {
+            let _ = next_call.recv().await;
+        }
+
         poll_fn(|cx| {
             let mut buffer = self.buf.borrow_mut();
-            let mut next_call = self.next_call.borrow_mut();
-            if let Some(next_call) = &*next_call {
-                // hold advancement until the last released task either makes a call or is dropped
-                let _ = ready!(next_call.poll_recv(cx));
-            }
-            next_call.take();
 
+            // handle inner service readiness
             if self.service.poll_ready(cx)?.is_pending() {
                 if buffer.len() < self.size {
                     // buffer next request
                     self.ready.set(false);
-                    return Poll::Ready(Ok(()));
+                    self.service_pending.set(false);
+                    Poll::Ready(Ok(()))
                 } else {
                     log::trace!("Buffer limit exceeded");
-                    return Poll::Pending;
+                    // service is not ready
+                    self.service_pending.set(true);
+                    let _ = self.readiness.take().map(|w| w.wake());
+                    Poll::Pending
                 }
-            }
+            } else {
+                self.service_pending.set(false);
 
-            while let Some(sender) = buffer.pop_front() {
-                let (next_call_tx, next_call_rx) = oneshot::channel();
-                if sender.send(next_call_tx).is_err()
-                    || next_call_rx.poll_recv(cx).is_ready()
-                {
-                    // the task is gone
-                    continue;
+                while let Some(sender) = buffer.pop_front() {
+                    let (next_call_tx, next_call_rx) = oneshot::channel();
+                    if sender.send(next_call_tx).is_err()
+                        || next_call_rx.poll_recv(cx).is_ready()
+                    {
+                        // the task is gone
+                        continue;
+                    }
+                    self.next_call.borrow_mut().replace(next_call_rx);
+                    self.ready.set(false);
+                    return Poll::Ready(Ok(()));
                 }
-                next_call.replace(next_call_rx);
-                self.ready.set(false);
-                return Poll::Ready(Ok(()));
-            }
 
-            self.ready.set(true);
-            Poll::Ready(Ok(()))
+                self.ready.set(true);
+                Poll::Ready(Ok(()))
+            }
         })
         .await
     }
 
+    async fn not_ready(&self) {
+        let fut = poll_fn(|cx| {
+            if self.service_pending.get() {
+                Poll::Ready(())
+            } else {
+                self.readiness.set(Some(cx.waker().clone()));
+                Poll::Pending
+            }
+        });
+
+        crate::future::select(fut, self.service.get_ref().not_ready()).await;
+    }
+
     async fn shutdown(&self) {
+        // hold advancement until the last released task either makes a call or is dropped
+        let next_call = self.next_call.borrow_mut().take();
+        if let Some(next_call) = next_call {
+            let _ = next_call.recv().await;
+        }
+
         poll_fn(|cx| {
             let mut buffer = self.buf.borrow_mut();
             if self.cancel_on_shutdown {
                 buffer.clear();
-            } else if !buffer.is_empty() {
-                let mut next_call = self.next_call.borrow_mut();
-                if let Some(next_call) = &*next_call {
-                    // hold advancement until the last released task either makes a call or is dropped
-                    let _ = ready!(next_call.poll_recv(cx));
-                }
-                next_call.take();
+            }
 
+            if !buffer.is_empty() {
                 if ready!(self.service.poll_ready(cx)).is_err() {
                     log::error!(
                         "Buffered inner service failed while buffer flushing on shutdown"
@@ -252,7 +282,7 @@ where
                         // the task is gone
                         continue;
                     }
-                    next_call.replace(next_call_rx);
+                    self.next_call.borrow_mut().replace(next_call_rx);
                     if buffer.is_empty() {
                         break;
                     }
@@ -299,9 +329,10 @@ mod tests {
     use crate::future::lazy;
     use crate::task::LocalWaker;
 
-    #[derive(Clone)]
+    #[derive(Debug, Clone)]
     struct TestService(Rc<Inner>);
 
+    #[derive(Debug)]
     struct Inner {
         ready: Cell<bool>,
         waker: LocalWaker,
@@ -342,6 +373,7 @@ mod tests {
         let srv =
             Pipeline::new(BufferService::new(2, TestService(inner.clone())).clone()).bind();
         assert_eq!(lazy(|cx| srv.poll_ready(cx)).await, Poll::Ready(Ok(())));
+        assert_eq!(lazy(|cx| srv.poll_not_ready(cx)).await, Poll::Pending);
 
         let srv1 = srv.clone();
         ntex::rt::spawn(async move {
@@ -350,6 +382,7 @@ mod tests {
         crate::time::sleep(Duration::from_millis(25)).await;
         assert_eq!(inner.count.get(), 0);
         assert_eq!(lazy(|cx| srv.poll_ready(cx)).await, Poll::Ready(Ok(())));
+        assert_eq!(lazy(|cx| srv.poll_not_ready(cx)).await, Poll::Pending);
 
         let srv1 = srv.clone();
         ntex::rt::spawn(async move {
@@ -358,10 +391,12 @@ mod tests {
         crate::time::sleep(Duration::from_millis(25)).await;
         assert_eq!(inner.count.get(), 0);
         assert_eq!(lazy(|cx| srv.poll_ready(cx)).await, Poll::Pending);
+        assert_eq!(lazy(|cx| srv.poll_not_ready(cx)).await, Poll::Ready(()));
 
         inner.ready.set(true);
         inner.waker.wake();
         assert_eq!(lazy(|cx| srv.poll_ready(cx)).await, Poll::Ready(Ok(())));
+        assert_eq!(lazy(|cx| srv.poll_not_ready(cx)).await, Poll::Pending);
 
         crate::time::sleep(Duration::from_millis(25)).await;
         assert_eq!(inner.count.get(), 1);
@@ -369,6 +404,7 @@ mod tests {
         inner.ready.set(true);
         inner.waker.wake();
         assert_eq!(lazy(|cx| srv.poll_ready(cx)).await, Poll::Ready(Ok(())));
+        assert_eq!(lazy(|cx| srv.poll_not_ready(cx)).await, Poll::Pending);
 
         crate::time::sleep(Duration::from_millis(25)).await;
         assert_eq!(inner.count.get(), 2);
@@ -381,10 +417,18 @@ mod tests {
 
         let srv = Pipeline::new(BufferService::new(2, TestService(inner.clone()))).bind();
         assert_eq!(lazy(|cx| srv.poll_ready(cx)).await, Poll::Ready(Ok(())));
+        assert_eq!(lazy(|cx| srv.poll_not_ready(cx)).await, Poll::Pending);
+
         let _ = srv.call(()).await;
         assert_eq!(inner.count.get(), 1);
         assert_eq!(lazy(|cx| srv.poll_ready(cx)).await, Poll::Ready(Ok(())));
+        assert_eq!(lazy(|cx| srv.poll_not_ready(cx)).await, Poll::Pending);
         assert!(lazy(|cx| srv.poll_shutdown(cx)).await.is_ready());
+
+        let err = BufferServiceError::from("test");
+        assert!(format!("{}", err).contains("test"));
+        assert!(format!("{:?}", srv).contains("BufferService"));
+        assert!(format!("{:?}", Buffer::<TestService>::default()).contains("Buffer"));
     }
 
     #[ntex_macros::rt_test2]

ntex-util/src/services/variant.rs

@@ -257,7 +257,7 @@ mod tests {
 
     use super::*;
 
-    #[derive(Clone)]
+    #[derive(Debug, Clone)]
     struct Srv1;
 
     impl Service<()> for Srv1 {
@@ -275,7 +275,7 @@ mod tests {
         }
     }
 
-    #[derive(Clone)]
+    #[derive(Debug, Clone)]
     struct Srv2;
 
     impl Service<()> for Srv2 {
@@ -303,9 +303,9 @@ mod tests {
             .clone()
             .v3(fn_factory(|| async { Ok::<_, ()>(Srv2) }))
             .clone();
-        assert!(format!("{:?}", factory).contains("Variant"));
 
         let service = factory.pipeline(&()).await.unwrap().clone();
+        assert!(format!("{:?}", service).contains("Variant"));
 
         let mut f = pin::pin!(service.not_ready());
         let _ = poll_fn(|cx| {