fix connection keepalive support

src/framed/framed.rs

@@ -0,0 +1,283 @@
+#![allow(deprecated)]
+
+use std::fmt;
+use std::io::{self, Read, Write};
+
+use bytes::BytesMut;
+use futures::{Poll, Sink, StartSend, Stream};
+use tokio_codec::{Decoder, Encoder};
+use tokio_io::{AsyncRead, AsyncWrite};
+
+use super::framed_read::{framed_read2, framed_read2_with_buffer, FramedRead2};
+use super::framed_write::{framed_write2, framed_write2_with_buffer, FramedWrite2};
+
+/// A unified `Stream` and `Sink` interface to an underlying I/O object, using
+/// the `Encoder` and `Decoder` traits to encode and decode frames.
+///
+/// You can create a `Framed` instance by using the `AsyncRead::framed` adapter.
+pub struct Framed<T, U> {
+    inner: FramedRead2<FramedWrite2<Fuse<T, U>>>,
+}
+
+pub struct Fuse<T, U>(pub T, pub U);
+
+impl<T, U> Framed<T, U>
+where
+    T: AsyncRead + AsyncWrite,
+    U: Decoder + Encoder,
+{
+    /// Provides a `Stream` and `Sink` interface for reading and writing to this
+    /// `Io` object, using `Decode` and `Encode` to read and write the raw data.
+    ///
+    /// Raw I/O objects work with byte sequences, but higher-level code usually
+    /// wants to batch these into meaningful chunks, called "frames". This
+    /// method layers framing on top of an I/O object, by using the `Codec`
+    /// traits to handle encoding and decoding of messages frames. Note that
+    /// the incoming and outgoing frame types may be distinct.
+    ///
+    /// This function returns a *single* object that is both `Stream` and
+    /// `Sink`; grouping this into a single object is often useful for layering
+    /// things like gzip or TLS, which require both read and write access to the
+    /// underlying object.
+    ///
+    /// If you want to work more directly with the streams and sink, consider
+    /// calling `split` on the `Framed` returned by this method, which will
+    /// break them into separate objects, allowing them to interact more easily.
+    pub fn new(inner: T, codec: U) -> Framed<T, U> {
+        Framed {
+            inner: framed_read2(framed_write2(Fuse(inner, codec))),
+        }
+    }
+}
+
+impl<T, U> Framed<T, U> {
+    /// Provides a `Stream` and `Sink` interface for reading and writing to this
+    /// `Io` object, using `Decode` and `Encode` to read and write the raw data.
+    ///
+    /// Raw I/O objects work with byte sequences, but higher-level code usually
+    /// wants to batch these into meaningful chunks, called "frames". This
+    /// method layers framing on top of an I/O object, by using the `Codec`
+    /// traits to handle encoding and decoding of messages frames. Note that
+    /// the incoming and outgoing frame types may be distinct.
+    ///
+    /// This function returns a *single* object that is both `Stream` and
+    /// `Sink`; grouping this into a single object is often useful for layering
+    /// things like gzip or TLS, which require both read and write access to the
+    /// underlying object.
+    ///
+    /// This objects takes a stream and a readbuffer and a writebuffer. These field
+    /// can be obtained from an existing `Framed` with the `into_parts` method.
+    ///
+    /// If you want to work more directly with the streams and sink, consider
+    /// calling `split` on the `Framed` returned by this method, which will
+    /// break them into separate objects, allowing them to interact more easily.
+    pub fn from_parts(parts: FramedParts<T, U>) -> Framed<T, U> {
+        Framed {
+            inner: framed_read2_with_buffer(
+                framed_write2_with_buffer(Fuse(parts.io, parts.codec), parts.write_buf),
+                parts.read_buf,
+            ),
+        }
+    }
+
+    /// Returns a reference to the underlying codec.
+    pub fn get_codec(&self) -> &U {
+        &self.inner.get_ref().get_ref().1
+    }
+
+    /// Returns a mutable reference to the underlying codec.
+    pub fn get_codec_mut(&mut self) -> &mut U {
+        &mut self.inner.get_mut().get_mut().1
+    }
+
+    /// Returns a reference to the underlying I/O stream wrapped by
+    /// `Frame`.
+    ///
+    /// Note that care should be taken to not tamper with the underlying stream
+    /// of data coming in as it may corrupt the stream of frames otherwise
+    /// being worked with.
+    pub fn get_ref(&self) -> &T {
+        &self.inner.get_ref().get_ref().0
+    }
+
+    /// Returns a mutable reference to the underlying I/O stream wrapped by
+    /// `Frame`.
+    ///
+    /// Note that care should be taken to not tamper with the underlying stream
+    /// of data coming in as it may corrupt the stream of frames otherwise
+    /// being worked with.
+    pub fn get_mut(&mut self) -> &mut T {
+        &mut self.inner.get_mut().get_mut().0
+    }
+
+    /// Consumes the `Frame`, returning its underlying I/O stream.
+    ///
+    /// Note that care should be taken to not tamper with the underlying stream
+    /// of data coming in as it may corrupt the stream of frames otherwise
+    /// being worked with.
+    pub fn into_inner(self) -> T {
+        self.inner.into_inner().into_inner().0
+    }
+
+    /// Consumes the `Frame`, returning its underlying I/O stream, the buffer
+    /// with unprocessed data, and the codec.
+    ///
+    /// Note that care should be taken to not tamper with the underlying stream
+    /// of data coming in as it may corrupt the stream of frames otherwise
+    /// being worked with.
+    pub fn into_parts(self) -> FramedParts<T, U> {
+        let (inner, read_buf) = self.inner.into_parts();
+        let (inner, write_buf) = inner.into_parts();
+
+        FramedParts {
+            io: inner.0,
+            codec: inner.1,
+            read_buf: read_buf,
+            write_buf: write_buf,
+            _priv: (),
+        }
+    }
+}
+
+impl<T, U> Stream for Framed<T, U>
+where
+    T: AsyncRead,
+    U: Decoder,
+{
+    type Item = U::Item;
+    type Error = U::Error;
+
+    fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
+        self.inner.poll()
+    }
+}
+
+impl<T, U> Sink for Framed<T, U>
+where
+    T: AsyncWrite,
+    U: Encoder,
+    U::Error: From<io::Error>,
+{
+    type SinkItem = U::Item;
+    type SinkError = U::Error;
+
+    fn start_send(
+        &mut self, item: Self::SinkItem,
+    ) -> StartSend<Self::SinkItem, Self::SinkError> {
+        self.inner.get_mut().start_send(item)
+    }
+
+    fn poll_complete(&mut self) -> Poll<(), Self::SinkError> {
+        self.inner.get_mut().poll_complete()
+    }
+
+    fn close(&mut self) -> Poll<(), Self::SinkError> {
+        self.inner.get_mut().close()
+    }
+}
+
+impl<T, U> fmt::Debug for Framed<T, U>
+where
+    T: fmt::Debug,
+    U: fmt::Debug,
+{
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_struct("Framed")
+            .field("io", &self.inner.get_ref().get_ref().0)
+            .field("codec", &self.inner.get_ref().get_ref().1)
+            .finish()
+    }
+}
+
+// ===== impl Fuse =====
+
+impl<T: Read, U> Read for Fuse<T, U> {
+    fn read(&mut self, dst: &mut [u8]) -> io::Result<usize> {
+        self.0.read(dst)
+    }
+}
+
+impl<T: AsyncRead, U> AsyncRead for Fuse<T, U> {
+    unsafe fn prepare_uninitialized_buffer(&self, buf: &mut [u8]) -> bool {
+        self.0.prepare_uninitialized_buffer(buf)
+    }
+}
+
+impl<T: Write, U> Write for Fuse<T, U> {
+    fn write(&mut self, src: &[u8]) -> io::Result<usize> {
+        self.0.write(src)
+    }
+
+    fn flush(&mut self) -> io::Result<()> {
+        self.0.flush()
+    }
+}
+
+impl<T: AsyncWrite, U> AsyncWrite for Fuse<T, U> {
+    fn shutdown(&mut self) -> Poll<(), io::Error> {
+        self.0.shutdown()
+    }
+}
+
+impl<T, U: Decoder> Decoder for Fuse<T, U> {
+    type Item = U::Item;
+    type Error = U::Error;
+
+    fn decode(
+        &mut self, buffer: &mut BytesMut,
+    ) -> Result<Option<Self::Item>, Self::Error> {
+        self.1.decode(buffer)
+    }
+
+    fn decode_eof(
+        &mut self, buffer: &mut BytesMut,
+    ) -> Result<Option<Self::Item>, Self::Error> {
+        self.1.decode_eof(buffer)
+    }
+}
+
+impl<T, U: Encoder> Encoder for Fuse<T, U> {
+    type Item = U::Item;
+    type Error = U::Error;
+
+    fn encode(
+        &mut self, item: Self::Item, dst: &mut BytesMut,
+    ) -> Result<(), Self::Error> {
+        self.1.encode(item, dst)
+    }
+}
+
+/// `FramedParts` contains an export of the data of a Framed transport.
+/// It can be used to construct a new `Framed` with a different codec.
+/// It contains all current buffers and the inner transport.
+#[derive(Debug)]
+pub struct FramedParts<T, U> {
+    /// The inner transport used to read bytes to and write bytes to
+    pub io: T,
+
+    /// The codec
+    pub codec: U,
+
+    /// The buffer with read but unprocessed data.
+    pub read_buf: BytesMut,
+
+    /// A buffer with unprocessed data which are not written yet.
+    pub write_buf: BytesMut,
+
+    /// This private field allows us to add additional fields in the future in a
+    /// backwards compatible way.
+    _priv: (),
+}
+
+impl<T, U> FramedParts<T, U> {
+    /// Create a new, default, `FramedParts`
+    pub fn new(io: T, codec: U) -> FramedParts<T, U> {
+        FramedParts {
+            io,
+            codec,
+            read_buf: BytesMut::new(),
+            write_buf: BytesMut::new(),
+            _priv: (),
+        }
+    }
+}

src/framed/framed_read.rs

@@ -0,0 +1,216 @@
+use std::fmt;
+
+use bytes::BytesMut;
+use futures::{Async, Poll, Sink, StartSend, Stream};
+use tokio_codec::Decoder;
+use tokio_io::AsyncRead;
+
+use super::framed::Fuse;
+
+/// A `Stream` of messages decoded from an `AsyncRead`.
+pub struct FramedRead<T, D> {
+    inner: FramedRead2<Fuse<T, D>>,
+}
+
+pub struct FramedRead2<T> {
+    inner: T,
+    eof: bool,
+    is_readable: bool,
+    buffer: BytesMut,
+}
+
+const INITIAL_CAPACITY: usize = 8 * 1024;
+
+// ===== impl FramedRead =====
+
+impl<T, D> FramedRead<T, D>
+where
+    T: AsyncRead,
+    D: Decoder,
+{
+    /// Creates a new `FramedRead` with the given `decoder`.
+    pub fn new(inner: T, decoder: D) -> FramedRead<T, D> {
+        FramedRead {
+            inner: framed_read2(Fuse(inner, decoder)),
+        }
+    }
+}
+
+impl<T, D> FramedRead<T, D> {
+    /// Returns a reference to the underlying I/O stream wrapped by
+    /// `FramedRead`.
+    ///
+    /// Note that care should be taken to not tamper with the underlying stream
+    /// of data coming in as it may corrupt the stream of frames otherwise
+    /// being worked with.
+    pub fn get_ref(&self) -> &T {
+        &self.inner.inner.0
+    }
+
+    /// Returns a mutable reference to the underlying I/O stream wrapped by
+    /// `FramedRead`.
+    ///
+    /// Note that care should be taken to not tamper with the underlying stream
+    /// of data coming in as it may corrupt the stream of frames otherwise
+    /// being worked with.
+    pub fn get_mut(&mut self) -> &mut T {
+        &mut self.inner.inner.0
+    }
+
+    /// Consumes the `FramedRead`, returning its underlying I/O stream.
+    ///
+    /// Note that care should be taken to not tamper with the underlying stream
+    /// of data coming in as it may corrupt the stream of frames otherwise
+    /// being worked with.
+    pub fn into_inner(self) -> T {
+        self.inner.inner.0
+    }
+
+    /// Returns a reference to the underlying decoder.
+    pub fn decoder(&self) -> &D {
+        &self.inner.inner.1
+    }
+
+    /// Returns a mutable reference to the underlying decoder.
+    pub fn decoder_mut(&mut self) -> &mut D {
+        &mut self.inner.inner.1
+    }
+}
+
+impl<T, D> Stream for FramedRead<T, D>
+where
+    T: AsyncRead,
+    D: Decoder,
+{
+    type Item = D::Item;
+    type Error = D::Error;
+
+    fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
+        self.inner.poll()
+    }
+}
+
+impl<T, D> Sink for FramedRead<T, D>
+where
+    T: Sink,
+{
+    type SinkItem = T::SinkItem;
+    type SinkError = T::SinkError;
+
+    fn start_send(
+        &mut self, item: Self::SinkItem,
+    ) -> StartSend<Self::SinkItem, Self::SinkError> {
+        self.inner.inner.0.start_send(item)
+    }
+
+    fn poll_complete(&mut self) -> Poll<(), Self::SinkError> {
+        self.inner.inner.0.poll_complete()
+    }
+
+    fn close(&mut self) -> Poll<(), Self::SinkError> {
+        self.inner.inner.0.close()
+    }
+}
+
+impl<T, D> fmt::Debug for FramedRead<T, D>
+where
+    T: fmt::Debug,
+    D: fmt::Debug,
+{
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_struct("FramedRead")
+            .field("inner", &self.inner.inner.0)
+            .field("decoder", &self.inner.inner.1)
+            .field("eof", &self.inner.eof)
+            .field("is_readable", &self.inner.is_readable)
+            .field("buffer", &self.inner.buffer)
+            .finish()
+    }
+}
+
+// ===== impl FramedRead2 =====
+
+pub fn framed_read2<T>(inner: T) -> FramedRead2<T> {
+    FramedRead2 {
+        inner: inner,
+        eof: false,
+        is_readable: false,
+        buffer: BytesMut::with_capacity(INITIAL_CAPACITY),
+    }
+}
+
+pub fn framed_read2_with_buffer<T>(inner: T, mut buf: BytesMut) -> FramedRead2<T> {
+    if buf.capacity() < INITIAL_CAPACITY {
+        let bytes_to_reserve = INITIAL_CAPACITY - buf.capacity();
+        buf.reserve(bytes_to_reserve);
+    }
+    FramedRead2 {
+        inner: inner,
+        eof: false,
+        is_readable: buf.len() > 0,
+        buffer: buf,
+    }
+}
+
+impl<T> FramedRead2<T> {
+    pub fn get_ref(&self) -> &T {
+        &self.inner
+    }
+
+    pub fn into_inner(self) -> T {
+        self.inner
+    }
+
+    pub fn into_parts(self) -> (T, BytesMut) {
+        (self.inner, self.buffer)
+    }
+
+    pub fn get_mut(&mut self) -> &mut T {
+        &mut self.inner
+    }
+}
+
+impl<T> Stream for FramedRead2<T>
+where
+    T: AsyncRead + Decoder,
+{
+    type Item = T::Item;
+    type Error = T::Error;
+
+    fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
+        loop {
+            // Repeatedly call `decode` or `decode_eof` as long as it is
+            // "readable". Readable is defined as not having returned `None`. If
+            // the upstream has returned EOF, and the decoder is no longer
+            // readable, it can be assumed that the decoder will never become
+            // readable again, at which point the stream is terminated.
+            if self.is_readable {
+                if self.eof {
+                    let frame = try!(self.inner.decode_eof(&mut self.buffer));
+                    return Ok(Async::Ready(frame));
+                }
+
+                trace!("attempting to decode a frame");
+
+                if let Some(frame) = try!(self.inner.decode(&mut self.buffer)) {
+                    trace!("frame decoded from buffer");
+                    return Ok(Async::Ready(Some(frame)));
+                }
+
+                self.is_readable = false;
+            }
+
+            assert!(!self.eof);
+
+            // Otherwise, try to read more data and try again. Make sure we've
+            // got room for at least one byte to read to ensure that we don't
+            // get a spurious 0 that looks like EOF
+            self.buffer.reserve(1);
+            if 0 == try_ready!(self.inner.read_buf(&mut self.buffer)) {
+                self.eof = true;
+            }
+
+            self.is_readable = true;
+        }
+    }
+}

src/framed/framed_write.rs

@@ -0,0 +1,243 @@
+use std::fmt;
+use std::io::{self, Read};
+
+use bytes::BytesMut;
+use futures::{Async, AsyncSink, Poll, Sink, StartSend, Stream};
+use tokio_codec::{Decoder, Encoder};
+use tokio_io::{AsyncRead, AsyncWrite};
+
+use super::framed::Fuse;
+
+/// A `Sink` of frames encoded to an `AsyncWrite`.
+pub struct FramedWrite<T, E> {
+    inner: FramedWrite2<Fuse<T, E>>,
+}
+
+pub struct FramedWrite2<T> {
+    inner: T,
+    buffer: BytesMut,
+}
+
+const INITIAL_CAPACITY: usize = 8 * 1024;
+const BACKPRESSURE_BOUNDARY: usize = INITIAL_CAPACITY;
+
+impl<T, E> FramedWrite<T, E>
+where
+    T: AsyncWrite,
+    E: Encoder,
+{
+    /// Creates a new `FramedWrite` with the given `encoder`.
+    pub fn new(inner: T, encoder: E) -> FramedWrite<T, E> {
+        FramedWrite {
+            inner: framed_write2(Fuse(inner, encoder)),
+        }
+    }
+}
+
+impl<T, E> FramedWrite<T, E> {
+    /// Returns a reference to the underlying I/O stream wrapped by
+    /// `FramedWrite`.
+    ///
+    /// Note that care should be taken to not tamper with the underlying stream
+    /// of data coming in as it may corrupt the stream of frames otherwise
+    /// being worked with.
+    pub fn get_ref(&self) -> &T {
+        &self.inner.inner.0
+    }
+
+    /// Returns a mutable reference to the underlying I/O stream wrapped by
+    /// `FramedWrite`.
+    ///
+    /// Note that care should be taken to not tamper with the underlying stream
+    /// of data coming in as it may corrupt the stream of frames otherwise
+    /// being worked with.
+    pub fn get_mut(&mut self) -> &mut T {
+        &mut self.inner.inner.0
+    }
+
+    /// Consumes the `FramedWrite`, returning its underlying I/O stream.
+    ///
+    /// Note that care should be taken to not tamper with the underlying stream
+    /// of data coming in as it may corrupt the stream of frames otherwise
+    /// being worked with.
+    pub fn into_inner(self) -> T {
+        self.inner.inner.0
+    }
+
+    /// Returns a reference to the underlying decoder.
+    pub fn encoder(&self) -> &E {
+        &self.inner.inner.1
+    }
+
+    /// Returns a mutable reference to the underlying decoder.
+    pub fn encoder_mut(&mut self) -> &mut E {
+        &mut self.inner.inner.1
+    }
+}
+
+impl<T, E> Sink for FramedWrite<T, E>
+where
+    T: AsyncWrite,
+    E: Encoder,
+{
+    type SinkItem = E::Item;
+    type SinkError = E::Error;
+
+    fn start_send(&mut self, item: E::Item) -> StartSend<E::Item, E::Error> {
+        self.inner.start_send(item)
+    }
+
+    fn poll_complete(&mut self) -> Poll<(), Self::SinkError> {
+        self.inner.poll_complete()
+    }
+
+    fn close(&mut self) -> Poll<(), Self::SinkError> {
+        Ok(try!(self.inner.close()))
+    }
+}
+
+impl<T, D> Stream for FramedWrite<T, D>
+where
+    T: Stream,
+{
+    type Item = T::Item;
+    type Error = T::Error;
+
+    fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
+        self.inner.inner.0.poll()
+    }
+}
+
+impl<T, U> fmt::Debug for FramedWrite<T, U>
+where
+    T: fmt::Debug,
+    U: fmt::Debug,
+{
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_struct("FramedWrite")
+            .field("inner", &self.inner.get_ref().0)
+            .field("encoder", &self.inner.get_ref().1)
+            .field("buffer", &self.inner.buffer)
+            .finish()
+    }
+}
+
+// ===== impl FramedWrite2 =====
+
+pub fn framed_write2<T>(inner: T) -> FramedWrite2<T> {
+    FramedWrite2 {
+        inner: inner,
+        buffer: BytesMut::with_capacity(INITIAL_CAPACITY),
+    }
+}
+
+pub fn framed_write2_with_buffer<T>(inner: T, mut buf: BytesMut) -> FramedWrite2<T> {
+    if buf.capacity() < INITIAL_CAPACITY {
+        let bytes_to_reserve = INITIAL_CAPACITY - buf.capacity();
+        buf.reserve(bytes_to_reserve);
+    }
+    FramedWrite2 {
+        inner: inner,
+        buffer: buf,
+    }
+}
+
+impl<T> FramedWrite2<T> {
+    pub fn get_ref(&self) -> &T {
+        &self.inner
+    }
+
+    pub fn into_inner(self) -> T {
+        self.inner
+    }
+
+    pub fn into_parts(self) -> (T, BytesMut) {
+        (self.inner, self.buffer)
+    }
+
+    pub fn get_mut(&mut self) -> &mut T {
+        &mut self.inner
+    }
+}
+
+impl<T> Sink for FramedWrite2<T>
+where
+    T: AsyncWrite + Encoder,
+{
+    type SinkItem = T::Item;
+    type SinkError = T::Error;
+
+    fn start_send(&mut self, item: T::Item) -> StartSend<T::Item, T::Error> {
+        // If the buffer is already over 8KiB, then attempt to flush it. If after flushing it's
+        // *still* over 8KiB, then apply backpressure (reject the send).
+        if self.buffer.len() >= BACKPRESSURE_BOUNDARY {
+            try!(self.poll_complete());
+
+            if self.buffer.len() >= BACKPRESSURE_BOUNDARY {
+                return Ok(AsyncSink::NotReady(item));
+            }
+        }
+
+        try!(self.inner.encode(item, &mut self.buffer));
+
+        Ok(AsyncSink::Ready)
+    }
+
+    fn poll_complete(&mut self) -> Poll<(), Self::SinkError> {
+        trace!("flushing framed transport");
+
+        while !self.buffer.is_empty() {
+            trace!("writing; remaining={}", self.buffer.len());
+
+            let n = try_ready!(self.inner.poll_write(&self.buffer));
+
+            if n == 0 {
+                return Err(io::Error::new(
+                    io::ErrorKind::WriteZero,
+                    "failed to \
+                     write frame to transport",
+                ).into());
+            }
+
+            // TODO: Add a way to `bytes` to do this w/o returning the drained
+            // data.
+            let _ = self.buffer.split_to(n);
+        }
+
+        // Try flushing the underlying IO
+        try_ready!(self.inner.poll_flush());
+
+        trace!("framed transport flushed");
+        return Ok(Async::Ready(()));
+    }
+
+    fn close(&mut self) -> Poll<(), Self::SinkError> {
+        try_ready!(self.poll_complete());
+        Ok(try!(self.inner.shutdown()))
+    }
+}
+
+impl<T: Decoder> Decoder for FramedWrite2<T> {
+    type Item = T::Item;
+    type Error = T::Error;
+
+    fn decode(&mut self, src: &mut BytesMut) -> Result<Option<T::Item>, T::Error> {
+        self.inner.decode(src)
+    }
+
+    fn decode_eof(&mut self, src: &mut BytesMut) -> Result<Option<T::Item>, T::Error> {
+        self.inner.decode_eof(src)
+    }
+}
+
+impl<T: Read> Read for FramedWrite2<T> {
+    fn read(&mut self, dst: &mut [u8]) -> io::Result<usize> {
+        self.inner.read(dst)
+    }
+}
+
+impl<T: AsyncRead> AsyncRead for FramedWrite2<T> {
+    unsafe fn prepare_uninitialized_buffer(&self, buf: &mut [u8]) -> bool {
+        self.inner.prepare_uninitialized_buffer(buf)
+    }
+}

src/framed/mod.rs

@@ -0,0 +1,32 @@
+//! Utilities for encoding and decoding frames.
+//!
+//! Contains adapters to go from streams of bytes, [`AsyncRead`] and
+//! [`AsyncWrite`], to framed streams implementing [`Sink`] and [`Stream`].
+//! Framed streams are also known as [transports].
+//!
+//! [`AsyncRead`]: #
+//! [`AsyncWrite`]: #
+//! [`Sink`]: #
+//! [`Stream`]: #
+//! [transports]: #
+
+#![deny(missing_docs, missing_debug_implementations, warnings)]
+#![doc(hidden, html_root_url = "https://docs.rs/tokio-codec/0.1.0")]
+
+// _tokio_codec are the items that belong in the `tokio_codec` crate. However, because we need to
+// maintain backward compatibility until the next major breaking change, they are defined here.
+// When the next breaking change comes, they should be moved to the `tokio_codec` crate and become
+// independent.
+//
+// The primary reason we can't move these to `tokio-codec` now is because, again for backward
+// compatibility reasons, we need to keep `Decoder` and `Encoder` in tokio_io::codec. And `Decoder`
+// and `Encoder` needs to reference `Framed`. So they all still need to still be in the same
+// module.
+
+mod framed;
+mod framed_read;
+mod framed_write;
+
+pub use self::framed::{Framed, FramedParts};
+pub use self::framed_read::FramedRead;
+pub use self::framed_write::FramedWrite;

src/h1/codec.rs

@@ -6,7 +6,7 @@ use tokio_codec::{Decoder, Encoder};
 
 use super::decoder::H1Decoder;
 pub use super::decoder::InMessage;
-use super::response::{ResponseInfo, ResponseLength};
+use super::encoder::{ResponseEncoder, ResponseLength};
 use body::Body;
 use error::ParseError;
 use helpers;
@@ -15,6 +15,17 @@ use http::{Method, Version};
 use httpresponse::HttpResponse;
 use request::RequestPool;
 
+bitflags! {
+    struct Flags: u8 {
+        const HEAD = 0b0000_0001;
+        const UPGRADE = 0b0000_0010;
+        const KEEPALIVE = 0b0000_0100;
+        const KEEPALIVE_ENABLED = 0b0001_0000;
+    }
+}
+
+const AVERAGE_HEADER_SIZE: usize = 30;
+
 /// Http response
 pub enum OutMessage {
     /// Http response message
@@ -26,91 +37,40 @@ pub enum OutMessage {
 /// HTTP/1 Codec
 pub struct Codec {
     decoder: H1Decoder,
-    encoder: H1Writer,
-    head: bool,
     version: Version,
-}
 
-impl Codec {
+    // encoder part
-    /// Create HTTP/1 codec
-    pub fn new() -> Self {
-        Codec::with_pool(RequestPool::pool())
-    }
-
-    /// Create HTTP/1 codec with request's pool
-    pub(crate) fn with_pool(pool: &'static RequestPool) -> Self {
-        Codec {
-            decoder: H1Decoder::with_pool(pool),
-            encoder: H1Writer::new(),
-            head: false,
-            version: Version::HTTP_11,
-        }
-    }
-}
-
-impl Decoder for Codec {
-    type Item = InMessage;
-    type Error = ParseError;
-
-    fn decode(&mut self, src: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> {
-        let res = self.decoder.decode(src);
-
-        match res {
-            Ok(Some(InMessage::Message(ref req)))
-            | Ok(Some(InMessage::MessageWithPayload(ref req))) => {
-                self.head = req.inner.method == Method::HEAD;
-                self.version = req.inner.version;
-            }
-            _ => (),
-        }
-        res
-    }
-}
-
-impl Encoder for Codec {
-    type Item = OutMessage;
-    type Error = io::Error;
-
-    fn encode(
-        &mut self, item: Self::Item, dst: &mut BytesMut,
-    ) -> Result<(), Self::Error> {
-        match item {
-            OutMessage::Response(res) => {
-                self.encoder.encode(res, dst, self.head, self.version)?;
-            }
-            OutMessage::Payload(bytes) => {
-                dst.extend_from_slice(&bytes);
-            }
-        }
-        Ok(())
-    }
-}
-
-bitflags! {
-    struct Flags: u8 {
-        const STARTED = 0b0000_0001;
-        const UPGRADE = 0b0000_0010;
-        const KEEPALIVE = 0b0000_0100;
-        const DISCONNECTED = 0b0000_1000;
-    }
-}
-
-const AVERAGE_HEADER_SIZE: usize = 30;
-
-struct H1Writer {
     flags: Flags,
     written: u64,
     headers_size: u32,
-    info: ResponseInfo,
+    te: ResponseEncoder,
 }
 
-impl H1Writer {
+impl Codec {
-    fn new() -> H1Writer {
+    /// Create HTTP/1 codec.
-        H1Writer {
+    ///
-            flags: Flags::empty(),
+    /// `keepalive_enabled` how response `connection` header get generated.
+    pub fn new(keepalive_enabled: bool) -> Self {
+        Codec::with_pool(RequestPool::pool(), keepalive_enabled)
+    }
+
+    /// Create HTTP/1 codec with request's pool
+    pub(crate) fn with_pool(
+        pool: &'static RequestPool, keepalive_enabled: bool,
+    ) -> Self {
+        let flags = if keepalive_enabled {
+            Flags::KEEPALIVE_ENABLED
+        } else {
+            Flags::empty()
+        };
+        Codec {
+            decoder: H1Decoder::with_pool(pool),
+            version: Version::HTTP_11,
+
+            flags,
             written: 0,
             headers_size: 0,
-            info: ResponseInfo::default(),
+            te: ResponseEncoder::default(),
         }
     }
 
@@ -118,46 +78,42 @@ impl H1Writer {
         self.written
     }
 
-    pub fn reset(&mut self) {
-        self.written = 0;
-        self.flags = Flags::KEEPALIVE;
-    }
-
     pub fn upgrade(&self) -> bool {
         self.flags.contains(Flags::UPGRADE)
     }
 
     pub fn keepalive(&self) -> bool {
-        self.flags.contains(Flags::KEEPALIVE) && !self.flags.contains(Flags::UPGRADE)
+        self.flags.contains(Flags::KEEPALIVE)
     }
 
-    fn encode(
+    fn encode_response(
-        &mut self, mut msg: HttpResponse, buffer: &mut BytesMut, head: bool,
+        &mut self, mut msg: HttpResponse, buffer: &mut BytesMut,
-        version: Version,
     ) -> io::Result<()> {
-        // prepare task
+        // prepare transfer encoding
-        self.info.update(&mut msg, head, version);
+        self.te
+            .update(&mut msg, self.flags.contains(Flags::HEAD), self.version);
 
-        //if msg.keep_alive().unwrap_or_else(|| req.keep_alive()) {
+        let ka = self.flags.contains(Flags::KEEPALIVE_ENABLED) && msg
-        //self.flags = Flags::STARTED | Flags::KEEPALIVE;
+            .keep_alive()
-        //} else {
+            .unwrap_or_else(|| self.flags.contains(Flags::KEEPALIVE));
-        self.flags = Flags::STARTED;
-        //}
 
         // Connection upgrade
-        let version = msg.version().unwrap_or_else(|| Version::HTTP_11); //req.inner.version);
+        let version = msg.version().unwrap_or_else(|| self.version);
         if msg.upgrade() {
             self.flags.insert(Flags::UPGRADE);
+            self.flags.remove(Flags::KEEPALIVE);
             msg.headers_mut()
                 .insert(CONNECTION, HeaderValue::from_static("upgrade"));
         }
         // keep-alive
-        else if self.flags.contains(Flags::KEEPALIVE) {
+        else if ka {
+            self.flags.insert(Flags::KEEPALIVE);
             if version < Version::HTTP_11 {
                 msg.headers_mut()
                     .insert(CONNECTION, HeaderValue::from_static("keep-alive"));
             }
         } else if version >= Version::HTTP_11 {
+            self.flags.remove(Flags::KEEPALIVE);
             msg.headers_mut()
                 .insert(CONNECTION, HeaderValue::from_static("close"));
         }
@@ -183,7 +139,7 @@ impl H1Writer {
             buffer.extend_from_slice(reason);
 
             // content length
-            match self.info.length {
+            match self.te.length {
                 ResponseLength::Chunked => {
                     buffer.extend_from_slice(b"\r\ntransfer-encoding: chunked\r\n")
                 }
@@ -209,7 +165,7 @@ impl H1Writer {
             for (key, value) in msg.headers() {
                 match *key {
                     TRANSFER_ENCODING => continue,
-                    CONTENT_LENGTH => match self.info.length {
+                    CONTENT_LENGTH => match self.te.length {
                         ResponseLength::None => (),
                         _ => continue,
                     },
@@ -272,3 +228,46 @@ impl H1Writer {
         Ok(())
     }
 }
+
+impl Decoder for Codec {
+    type Item = InMessage;
+    type Error = ParseError;
+
+    fn decode(&mut self, src: &mut BytesMut) -> Result<Option<Self::Item>, Self::Error> {
+        let res = self.decoder.decode(src);
+
+        match res {
+            Ok(Some(InMessage::Message(ref req)))
+            | Ok(Some(InMessage::MessageWithPayload(ref req))) => {
+                self.flags
+                    .set(Flags::HEAD, req.inner.method == Method::HEAD);
+                self.version = req.inner.version;
+                if self.flags.contains(Flags::KEEPALIVE_ENABLED) {
+                    self.flags.set(Flags::KEEPALIVE, req.keep_alive());
+                }
+            }
+            _ => (),
+        }
+        res
+    }
+}
+
+impl Encoder for Codec {
+    type Item = OutMessage;
+    type Error = io::Error;
+
+    fn encode(
+        &mut self, item: Self::Item, dst: &mut BytesMut,
+    ) -> Result<(), Self::Error> {
+        match item {
+            OutMessage::Response(res) => {
+                self.written = 0;
+                self.encode_response(res, dst)?;
+            }
+            OutMessage::Payload(bytes) => {
+                dst.extend_from_slice(&bytes);
+            }
+        }
+        Ok(())
+    }
+}

src/h1/dispatcher.rs

@@ -6,7 +6,6 @@ use std::time::Instant;
 use actix_net::service::Service;
 
 use futures::{Async, AsyncSink, Future, Poll, Sink, Stream};
-use tokio_codec::Framed;
 // use tokio_current_thread::spawn;
 use tokio_io::{AsyncRead, AsyncWrite};
 use tokio_timer::Delay;
@@ -17,6 +16,7 @@ use payload::{Payload, PayloadSender, PayloadStatus, PayloadWriter};
 use body::Body;
 use config::ServiceConfig;
 use error::DispatchError;
+use framed::Framed;
 use httpresponse::HttpResponse;
 use request::Request;
 
@@ -89,12 +89,13 @@ where
     pub fn with_timeout(
         stream: T, config: ServiceConfig, timeout: Option<Delay>, service: S,
     ) -> Self {
-        let flags = if config.keep_alive_enabled() {
+        let keepalive = config.keep_alive_enabled();
+        let flags = if keepalive {
             Flags::KEEPALIVE | Flags::KEEPALIVE_ENABLED | Flags::FLUSHED
         } else {
             Flags::FLUSHED
         };
-        let framed = Framed::new(stream, Codec::new());
+        let framed = Framed::new(stream, Codec::new(keepalive));
 
         let (ka_expire, ka_timer) = if let Some(delay) = timeout {
             (delay.deadline(), Some(delay))
@@ -235,6 +236,10 @@ where
                     let msg = item.take().expect("SendResponse is empty");
                     match self.framed.start_send(msg) {
                         Ok(AsyncSink::Ready) => {
+                            self.flags.set(
+                                Flags::KEEPALIVE,
+                                self.framed.get_codec().keepalive(),
+                            );
                             self.flags.remove(Flags::FLUSHED);
                             Some(Ok(State::None))
                         }
@@ -249,6 +254,10 @@ where
                     let (msg, body) = item.take().expect("SendResponse is empty");
                     match self.framed.start_send(msg) {
                         Ok(AsyncSink::Ready) => {
+                            self.flags.set(
+                                Flags::KEEPALIVE,
+                                self.framed.get_codec().keepalive(),
+                            );
                             self.flags.remove(Flags::FLUSHED);
                             Some(Ok(State::Payload(body)))
                         }

src/h1/encoder.rs

@@ -24,15 +24,15 @@ pub(crate) enum ResponseLength {
 }
 
 #[derive(Debug)]
-pub(crate) struct ResponseInfo {
+pub(crate) struct ResponseEncoder {
     head: bool,
     pub length: ResponseLength,
     pub te: TransferEncoding,
 }
 
-impl Default for ResponseInfo {
+impl Default for ResponseEncoder {
     fn default() -> Self {
-        ResponseInfo {
+        ResponseEncoder {
             head: false,
             length: ResponseLength::None,
             te: TransferEncoding::empty(),
@@ -40,7 +40,7 @@ impl Default for ResponseInfo {
     }
 }
 
-impl ResponseInfo {
+impl ResponseEncoder {
     pub fn update(&mut self, resp: &mut HttpResponse, head: bool, version: Version) {
         self.head = head;
 

src/h1/mod.rs

@@ -2,7 +2,7 @@
 mod codec;
 mod decoder;
 mod dispatcher;
-mod response;
+mod encoder;
 mod service;
 
 pub use self::codec::{Codec, InMessage, OutMessage};

src/lib.rs

@@ -135,6 +135,9 @@ mod payload;
 mod request;
 mod uri;
 
+#[doc(hidden)]
+pub mod framed;
+
 pub mod error;
 pub mod h1;
 pub(crate) mod helpers;