change UdpSocket to have Poll based methods

Cargo.lock

@@ -151,6 +151,7 @@ dependencies = [
  "async-std",
  "async-trait",
  "futures-io",
+ "futures-util",
  "trust-dns-resolver",
 ]
 

crates/async-std-resolver/Cargo.toml

@@ -67,6 +67,7 @@ path = "src/lib.rs"
 async-std = "1.6"
 async-trait = "0.1.36"
 futures-io = { version = "0.3.5", default-features = false, features = ["std"] }
+futures-util = { version = "0.3.5", default-features = false, features = ["std"] }
 trust-dns-resolver = { version = "0.20.0-alpha.3", path = "../resolver", default-features = false }
 
 [dev-dependencies]

crates/async-std-resolver/src/net.rs

@@ -8,9 +8,11 @@
 use std::io;
 use std::net::SocketAddr;
 use std::pin::Pin;
+use std::task::{Context, Poll};
 
 use async_trait::async_trait;
 use futures_io::{AsyncRead, AsyncWrite};
+use futures_util::future::FutureExt;
 use trust_dns_resolver::proto::tcp::{Connect, DnsTcpStream};
 use trust_dns_resolver::proto::udp::UdpSocket;
 
@@ -28,12 +30,21 @@ impl UdpSocket for AsyncStdUdpSocket {
             .map(AsyncStdUdpSocket)
     }
 
-    async fn recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
+    fn poll_recv_from(
-        self.0.recv_from(buf).await
+        &self,
+        cx: &mut Context,
+        buf: &mut [u8],
+    ) -> Poll<io::Result<(usize, SocketAddr)>> {
+        Box::pin(self.0.recv_from(buf)).poll_unpin(cx)
     }
 
-    async fn send_to(&self, buf: &[u8], target: &SocketAddr) -> io::Result<usize> {
+    fn poll_send_to(
-        self.0.send_to(buf, target).await
+        &self,
+        cx: &mut Context,
+        buf: &[u8],
+        target: &SocketAddr,
+    ) -> Poll<io::Result<usize>> {
+        Box::pin(self.0.send_to(buf, target)).poll_unpin(cx)
     }
 }
 

crates/proto/src/udp/udp_stream.rs

@@ -13,7 +13,7 @@ use std::task::{Context, Poll};
 
 use async_trait::async_trait;
 use futures_util::stream::Stream;
-use futures_util::{future::Future, ready, FutureExt, TryFutureExt};
+use futures_util::{future::Future, ready, TryFutureExt};
 use log::debug;
 use rand;
 use rand::distributions::{uniform::Uniform, Distribution};
@@ -32,11 +32,33 @@ where
 
     /// UdpSocket
     async fn bind(addr: &SocketAddr) -> io::Result<Self>;
+
+    /// Poll once Receive data from the socket and returns the number of bytes read and the address from
+    /// where the data came on success.
+    fn poll_recv_from(
+        &self,
+        cx: &mut Context,
+        buf: &mut [u8],
+    ) -> Poll<io::Result<(usize, SocketAddr)>>;
+
     /// Receive data from the socket and returns the number of bytes read and the address from
     /// where the data came on success.
-    async fn recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)>;
+    async fn recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
+        futures_util::future::poll_fn(|cx| self.poll_recv_from(cx, buf)).await
+    }
+
+    /// Poll once to send data to the given address.
+    fn poll_send_to(
+        &self,
+        cx: &mut Context,
+        buf: &[u8],
+        target: &SocketAddr,
+    ) -> Poll<io::Result<usize>>;
+
     /// Send data to the given address.
-    async fn send_to(&self, buf: &[u8], target: &SocketAddr) -> io::Result<usize>;
+    async fn send_to(&self, buf: &[u8], target: &SocketAddr) -> io::Result<usize> {
+        futures_util::future::poll_fn(|cx| self.poll_send_to(cx, buf, target)).await
+    }
 }
 
 /// A UDP stream of DNS binary packets
@@ -140,7 +162,7 @@ impl<S: UdpSocket + Send + 'static> Stream for UdpStream<S> {
             //   meaning that sending will be prefered over receiving...
 
             // TODO: shouldn't this return the error to send to the sender?
-            ready!(socket.send_to(message.bytes(), addr).poll_unpin(cx))?;
+            ready!(socket.poll_send_to(cx, message.bytes(), addr))?;
 
             // message sent, need to pop the message
             assert!(outbound_messages.as_mut().poll_next(cx).is_ready());
@@ -151,7 +173,7 @@ impl<S: UdpSocket + Send + 'static> Stream for UdpStream<S> {
 
         // TODO: this should match edns settings
         let mut buf = [0u8; 4096];
-        let (len, src) = ready!(socket.recv_from(&mut buf).poll_unpin(cx))?;
+        let (len, src) = ready!(socket.poll_recv_from(cx, &mut buf))?;
 
         let serial_message = SerialMessage::new(buf.iter().take(len).cloned().collect(), src);
         Poll::Ready(Some(Ok(serial_message)))
@@ -230,23 +252,25 @@ impl UdpSocket for tokio::net::UdpSocket {
         tokio::net::UdpSocket::bind(addr).await
     }
 
-    // TODO: add poll_recv_from and poll_send_to to be more efficient in allocations...
+    fn poll_recv_from(
-    async fn recv_from(&self, buf: &mut [u8]) -> io::Result<(usize, SocketAddr)> {
+        &self,
-        futures_util::future::poll_fn(|cx| {
+        cx: &mut Context,
+        buf: &mut [u8],
+    ) -> Poll<io::Result<(usize, SocketAddr)>> {
         let mut buf = tokio::io::ReadBuf::new(buf);
         let addr = ready!(tokio::net::UdpSocket::poll_recv_from(self, cx, &mut buf))?;
         let len = buf.filled().len();
 
         Poll::Ready(Ok((len, addr)))
-        })
-        .await
     }
 
-    async fn send_to(&self, buf: &[u8], target: &SocketAddr) -> io::Result<usize> {
+    fn poll_send_to(
-        futures_util::future::poll_fn(|cx| {
+        &self,
+        cx: &mut Context,
+        buf: &[u8],
+        target: &SocketAddr,
+    ) -> Poll<io::Result<usize>> {
         tokio::net::UdpSocket::poll_send_to(self, cx, buf, target)
-        })
-        .await
     }
 }