start migrate to futures 0.3 (again)

Cargo.toml

@@ -9,14 +9,15 @@ documentation = "https://docs.rs/tokio-rustls"
 readme = "README.md"
 description = "Asynchronous TLS/SSL streams for Tokio using Rustls."
 categories = ["asynchronous", "cryptography", "network-programming"]
+edition = "2018"
 
 [badges]
 travis-ci = { repository = "quininer/tokio-rustls" }
 appveyor = { repository = "quininer/tokio-rustls" }
 
 [dependencies]
-futures = "0.1"
-tokio-io = "0.1.6"
+smallvec = "*"
+futures = { package = "futures-preview", version = "0.3.0-alpha.15" }
 bytes = "0.4"
 iovec = "0.1"
 rustls = "0.15"

src/common/mod.rs

@@ -1,18 +1,23 @@
-mod vecbuf;
+// mod vecbuf;
 
+use std::pin::Pin;
+use std::task::Poll;
+use std::marker::Unpin;
 use std::io::{ self, Read, Write };
 use rustls::Session;
 use rustls::WriteV;
-use tokio_io::{ AsyncRead, AsyncWrite };
+use futures::task::Context;
+use futures::io::{ AsyncRead, AsyncWrite, IoVec };
+use smallvec::SmallVec;
 
 
-pub struct Stream<'a, IO: 'a, S: 'a> {
+pub struct Stream<'a, IO, S> {
     pub io: &'a mut IO,
-    pub session: &'a mut S
+    pub session: &'a mut S,
 }
 
-pub trait WriteTls<'a, IO: AsyncRead + AsyncWrite, S: Session>: Read + Write {
-    fn write_tls(&mut self) -> io::Result<usize>;
+pub trait WriteTls<IO: AsyncWrite, S: Session> {
+    fn write_tls(&mut self, cx: &mut Context) -> io::Result<usize>;
 }
 
 #[derive(Clone, Copy)]
@@ -22,36 +27,59 @@ enum Focus {
     Writable
 }
 
-impl<'a, IO: AsyncRead + AsyncWrite, S: Session> Stream<'a, IO, S> {
+impl<'a, IO: AsyncRead + AsyncWrite + Unpin, S: Session> Stream<'a, IO, S> {
     pub fn new(io: &'a mut IO, session: &'a mut S) -> Self {
         Stream { io, session }
     }
 
-    pub fn complete_io(&mut self) -> io::Result<(usize, usize)> {
-        self.complete_inner_io(Focus::Empty)
+    pub fn complete_io(&mut self, cx: &mut Context) -> Poll<io::Result<(usize, usize)>> {
+        self.complete_inner_io(cx, Focus::Empty)
     }
 
-    fn complete_read_io(&mut self) -> io::Result<usize> {
-        let n = self.session.read_tls(self.io)?;
+    fn complete_read_io(&mut self, cx: &mut Context) -> Poll<io::Result<usize>> {
+        struct Reader<'a, 'b, T> {
+            io: &'a mut T,
+            cx: &'a mut Context<'b>
+        }
+
+        impl<'a, 'b, T: AsyncRead + Unpin> Read for Reader<'a, 'b, T> {
+            fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+                match Pin::new(&mut self.io).poll_read(self.cx, buf) {
+                    Poll::Ready(result) => result,
+                    Poll::Pending => Err(io::ErrorKind::WouldBlock.into())
+                }
+            }
+        }
+
+        let mut reader = Reader { io: self.io, cx };
+
+        let n = match self.session.read_tls(&mut reader) {
+            Ok(n) => n,
+            Err(ref err) if err.kind() == io::ErrorKind::WouldBlock => return Poll::Pending,
+            Err(err) => return Poll::Ready(Err(err))
+        };
 
         self.session.process_new_packets()
             .map_err(|err| {
                 // In case we have an alert to send describing this error,
                 // try a last-gasp write -- but don't predate the primary
                 // error.
-                let _ = self.write_tls();
+                let _ = self.write_tls(cx);
 
                 io::Error::new(io::ErrorKind::InvalidData, err)
             })?;
 
-        Ok(n)
+        Poll::Ready(Ok(n))
     }
 
-    fn complete_write_io(&mut self) -> io::Result<usize> {
-        self.write_tls()
+    fn complete_write_io(&mut self, cx: &mut Context) -> Poll<io::Result<usize>> {
+        match self.write_tls(cx) {
+            Err(ref err) if err.kind() == io::ErrorKind::WouldBlock => Poll::Pending,
+            result => Poll::Ready(result)
+        }
     }
 
-    fn complete_inner_io(&mut self, focus: Focus) -> io::Result<(usize, usize)> {
+    fn complete_inner_io(&mut self, cx: &mut Context, focus: Focus) -> Poll<io::Result<(usize, usize)>> {
         let mut wrlen = 0;
         let mut rdlen = 0;
         let mut eof = false;
@@ -61,22 +89,22 @@ impl<'a, IO: AsyncRead + AsyncWrite, S: Session> Stream<'a, IO, S> {
             let mut read_would_block = false;
 
             while self.session.wants_write() {
-                match self.complete_write_io() {
-                    Ok(n) => wrlen += n,
-                    Err(ref err) if err.kind() == io::ErrorKind::WouldBlock => {
+                match self.complete_write_io(cx) {
+                    Poll::Ready(Ok(n)) => wrlen += n,
+                    Poll::Pending => {
                         write_would_block = true;
                         break
                     },
-                    Err(err) => return Err(err)
+                    Poll::Ready(Err(err)) => return Poll::Ready(Err(err))
                 }
             }
 
             if !eof && self.session.wants_read() {
-                match self.complete_read_io() {
-                    Ok(0) => eof = true,
-                    Ok(n) => rdlen += n,
-                    Err(ref err) if err.kind() == io::ErrorKind::WouldBlock => read_would_block = true,
-                    Err(err) => return Err(err)
+                match self.complete_read_io(cx) {
+                    Poll::Ready(Ok(0)) => eof = true,
+                    Poll::Ready(Ok(n)) => rdlen += n,
+                    Poll::Pending => read_would_block = true,
+                    Poll::Ready(Err(err)) => return Poll::Ready(Err(err))
                 }
             }
 
@@ -87,7 +115,7 @@ impl<'a, IO: AsyncRead + AsyncWrite, S: Session> Stream<'a, IO, S> {
             };
 
             match (eof, self.session.is_handshaking(), would_block) {
-                (true, true, _) => return Err(io::ErrorKind::UnexpectedEof.into()),
+                (true, true, _) => return Poll::Pending,
                 (_, false, true) => {
                     let would_block = match focus {
                         Focus::Empty => rdlen == 0 && wrlen == 0,
@@ -96,83 +124,96 @@ impl<'a, IO: AsyncRead + AsyncWrite, S: Session> Stream<'a, IO, S> {
                     };
 
                     return if would_block {
-                        Err(io::ErrorKind::WouldBlock.into())
+                        Poll::Pending
                     } else {
-                        Ok((rdlen, wrlen))
+                        Poll::Ready(Ok((rdlen, wrlen)))
                     };
                 },
-                (_, false, _) => return Ok((rdlen, wrlen)),
-                (_, true, true) => return Err(io::ErrorKind::WouldBlock.into()),
+                (_, false, _) => return Poll::Ready(Ok((rdlen, wrlen))),
+                (_, true, true) => return Poll::Pending,
                 (..) => ()
             }
         }
     }
 }
 
-impl<'a, IO: AsyncRead + AsyncWrite, S: Session> WriteTls<'a, IO, S> for Stream<'a, IO, S> {
-    fn write_tls(&mut self) -> io::Result<usize> {
-        use futures::Async;
-        use self::vecbuf::VecBuf;
+impl<'a, IO: AsyncRead + AsyncWrite + Unpin, S: Session> WriteTls<IO, S> for Stream<'a, IO, S> {
+    fn write_tls(&mut self, cx: &mut Context) -> io::Result<usize> {
+        struct Writer<'a, 'b, IO> {
+            io: &'a mut IO,
+            cx: &'a mut Context<'b>
+        }
 
-        struct V<'a, IO: 'a>(&'a mut IO);
-
-        impl<'a, IO: AsyncWrite> WriteV for V<'a, IO> {
+        impl<'a, 'b, IO: AsyncWrite + Unpin> WriteV for Writer<'a, 'b, IO> {
             fn writev(&mut self, vbytes: &[&[u8]]) -> io::Result<usize> {
-                let mut vbytes = VecBuf::new(vbytes);
-                match self.0.write_buf(&mut vbytes) {
-                    Ok(Async::Ready(n)) => Ok(n),
-                    Ok(Async::NotReady) => Err(io::ErrorKind::WouldBlock.into()),
-                    Err(err) => Err(err)
+                let vbytes = vbytes
+                    .into_iter()
+                    .try_fold(SmallVec::<[&'_ IoVec; 16]>::new(), |mut sum, next| {
+                        sum.push(IoVec::from_bytes(next)?);
+                        Some(sum)
+                    })
+                    .unwrap_or_default();
+
+                match Pin::new(&mut self.io).poll_vectored_write(self.cx, &vbytes) {
+                    Poll::Ready(result) => result,
+                    Poll::Pending => Err(io::ErrorKind::WouldBlock.into())
                 }
             }
         }
 
-        let mut vecio = V(self.io);
+        let mut vecio = Writer { io: self.io, cx };
         self.session.writev_tls(&mut vecio)
     }
 }
 
-impl<'a, IO: AsyncRead + AsyncWrite, S: Session> Read for Stream<'a, IO, S> {
-    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
+impl<'a, IO: AsyncRead + AsyncWrite + Unpin, S: Session> Stream<'a, IO, S> {
+    fn poll_read(&mut self, cx: &mut Context, buf: &mut [u8]) -> Poll<io::Result<usize>> {
         while self.session.wants_read() {
-            if let (0, _) = self.complete_inner_io(Focus::Readable)? {
-                break
+            match self.complete_inner_io(cx, Focus::Readable) {
+                Poll::Ready(Ok((0, _))) => break,
+                Poll::Ready(Ok(_)) => (),
+                Poll::Pending => return Poll::Pending,
+                Poll::Ready(Err(err)) => return Poll::Ready(Err(err))
             }
         }
-        self.session.read(buf)
-    }
-}
 
-impl<'a, IO: AsyncRead + AsyncWrite, S: Session> Write for Stream<'a, IO, S> {
-    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
+        // FIXME rustls always ready ?
+        Poll::Ready(self.session.read(buf))
+    }
+
+    fn poll_write(&mut self, cx: &mut Context, buf: &[u8]) -> Poll<io::Result<usize>> {
         let len = self.session.write(buf)?;
         while self.session.wants_write() {
-            match self.complete_inner_io(Focus::Writable) {
-                Ok(_) => (),
-                Err(ref err) if err.kind() == io::ErrorKind::WouldBlock && len != 0 => break,
-                Err(err) => return Err(err)
+            match self.complete_inner_io(cx, Focus::Writable) {
+                Poll::Ready(Ok(_)) => (),
+                Poll::Pending if len != 0 => break,
+                Poll::Pending => return Poll::Pending,
+                Poll::Ready(Err(err)) => return Poll::Ready(Err(err))
             }
         }
 
         if len != 0 || buf.is_empty() {
-            Ok(len)
+            Poll::Ready(Ok(len))
         } else {
             // not write zero
-            self.session.write(buf)
-                .and_then(|len| if len != 0 {
-                    Ok(len)
-                } else {
-                    Err(io::ErrorKind::WouldBlock.into())
-                })
+            match self.session.write(buf) {
+                Ok(0) => Poll::Pending,
+                Ok(n) => Poll::Ready(Ok(n)),
+                Err(err) => Poll::Ready(Err(err))
+            }
         }
     }
 
-    fn flush(&mut self) -> io::Result<()> {
+    fn poll_flush(&mut self, cx: &mut Context) -> Poll<io::Result<()>> {
         self.session.flush()?;
         while self.session.wants_write() {
-            self.complete_inner_io(Focus::Writable)?;
+            match self.complete_inner_io(cx, Focus::Writable) {
+                Poll::Ready(Ok(_)) => (),
+                Poll::Pending => return Poll::Pending,
+                Poll::Ready(Err(err)) => return Poll::Ready(Err(err))
+            }
         }
-        Ok(())
+        Poll::Ready(Ok(()))
     }
 }
 

src/lib.rs

@@ -1,17 +1,10 @@
 //! Asynchronous TLS/SSL streams for Tokio using [Rustls](https://github.com/ctz/rustls).
 
-pub extern crate rustls;
-pub extern crate webpki;
-
-extern crate bytes;
-extern crate futures;
-extern crate iovec;
-extern crate tokio_io;
-
-pub mod client;
+// pub mod client;
 mod common;
-pub mod server;
+// pub mod server;
 
+/*
 use common::Stream;
 use futures::{Async, Future, Poll};
 use rustls::{ClientConfig, ClientSession, ServerConfig, ServerSession};
@@ -194,3 +187,4 @@ impl<IO: AsyncRead + AsyncWrite> Future for Accept<IO> {
 #[cfg(feature = "early-data")]
 #[cfg(test)]
 mod test_0rtt;
+*/