Add readiness checks (#524)

Cargo.toml

@@ -45,9 +45,6 @@ ntex-util = { path = "ntex-util" }
 ntex-compio = { path = "ntex-compio" }
 ntex-tokio = { path = "ntex-tokio" }
 
-#ntex-neon = { git = "https://github.com/ntex-rs/neon.git" }
-#ntex-neon = { path = "../dev/neon" }
-
 [workspace.dependencies]
 async-task = "4.5.0"
 bitflags = "2"

ntex-io/src/tasks.rs

@@ -723,6 +723,27 @@ impl IoContext {
 
     /// Get read buffer
     pub fn with_read_buf<F>(&self, f: F) -> Poll<()>
+    where
+        F: FnOnce(&mut BytesVec) -> Poll<io::Result<usize>>,
+    {
+        let result = self.with_read_buf_inner(f);
+
+        // check read readiness
+        if result.is_pending() {
+            if let Some(waker) = self.0 .0.read_task.take() {
+                let mut cx = Context::from_waker(&waker);
+
+                if let Poll::Ready(ReadStatus::Ready) =
+                    self.0.filter().poll_read_ready(&mut cx)
+                {
+                    return Poll::Pending;
+                }
+            }
+        }
+        result
+    }
+
+    fn with_read_buf_inner<F>(&self, f: F) -> Poll<()>
     where
         F: FnOnce(&mut BytesVec) -> Poll<io::Result<usize>>,
     {
@@ -817,8 +838,33 @@ impl IoContext {
         }
     }
 
-    /// Get write buffer
     pub fn with_write_buf<F>(&self, f: F) -> Poll<()>
+    where
+        F: FnOnce(&BytesVec) -> Poll<io::Result<usize>>,
+    {
+        let result = self.with_write_buf_inner(f);
+
+        // check write readiness
+        if result.is_pending() {
+            let inner = &self.0 .0;
+            if let Some(waker) = inner.write_task.take() {
+                let ready = self
+                    .0
+                    .filter()
+                    .poll_write_ready(&mut Context::from_waker(&waker));
+                if !matches!(
+                    ready,
+                    Poll::Ready(WriteStatus::Ready | WriteStatus::Shutdown)
+                ) {
+                    return Poll::Ready(());
+                }
+            }
+        }
+        result
+    }
+
+    /// Get write buffer
+    fn with_write_buf_inner<F>(&self, f: F) -> Poll<()>
     where
         F: FnOnce(&BytesVec) -> Poll<io::Result<usize>>,
     {