blob: b3df25013e556d936d076a62394a5611bbd673fb [file] [log] [blame]
#![allow(deprecated)]
use std::io::{self, Read, Write};
use std::fmt;
use {AsyncRead, AsyncWrite};
use codec::{Decoder, Encoder};
use framed_read::{framed_read2, framed_read2_with_buffer, FramedRead2};
use framed_write::{framed_write2, framed_write2_with_buffer, FramedWrite2};
use futures::{Stream, Sink, StartSend, Poll};
use bytes::{BytesMut};
/// 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.
#[deprecated(since = "0.1.7", note = "Moved to tokio-codec")]
#[doc(hidden)]
pub struct Framed<T, U> {
inner: FramedRead2<FramedWrite2<Fuse<T, U>>>,
}
#[deprecated(since = "0.1.7", note = "Moved to tokio-codec")]
#[doc(hidden)]
pub struct Fuse<T, U>(pub T, pub U);
pub fn framed<T, U>(inner: T, codec: U) -> Framed<T, U>
where T: AsyncRead + AsyncWrite,
U: Decoder + Encoder,
{
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>, codec: U) -> Framed<T, U>
{
Framed {
inner: framed_read2_with_buffer(framed_write2_with_buffer(Fuse(parts.inner, codec), parts.writebuf), parts.readbuf),
}
}
/// 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 and the buffer
/// with unprocessed data.
///
/// 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> {
let (inner, readbuf) = self.inner.into_parts();
let (inner, writebuf) = inner.into_parts();
FramedParts { inner: inner.0, readbuf: readbuf, writebuf: writebuf }
}
/// Consumes the `Frame`, returning its underlying I/O stream and the buffer
/// with unprocessed data, and also the current codec state.
///
/// 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.
///
/// Note that this function will be removed once the codec has been
/// integrated into `FramedParts` in a new version (see
/// [#53](https://github.com/tokio-rs/tokio-io/pull/53)).
pub fn into_parts_and_codec(self) -> (FramedParts<T>, U) {
let (inner, readbuf) = self.inner.into_parts();
let (inner, writebuf) = inner.into_parts();
(FramedParts { inner: inner.0, readbuf: readbuf, writebuf: writebuf }, inner.1)
}
}
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>
{
/// The inner transport used to read bytes to and write bytes to
pub inner: T,
/// The buffer with read but unprocessed data.
pub readbuf: BytesMut,
/// A buffer with unprocessed data which are not written yet.
pub writebuf: BytesMut
}