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|
//! Types for working with docker TTY streams
use crate::{Error, Result};
use futures_util::{
io::{AsyncRead, AsyncReadExt, AsyncWrite},
stream::{Stream, TryStreamExt},
};
use pin_project::pin_project;
use std::{convert::TryInto, io};
/// An enum representing a chunk of TTY text streamed from a Docker container.
///
/// For convenience, this type can deref to the contained `Vec<u8>`.
#[derive(Debug, Clone)]
pub enum TtyChunk {
StdIn(Vec<u8>),
StdOut(Vec<u8>),
StdErr(Vec<u8>),
}
impl From<TtyChunk> for Vec<u8> {
fn from(tty_chunk: TtyChunk) -> Self {
match tty_chunk {
TtyChunk::StdIn(bytes) | TtyChunk::StdOut(bytes) | TtyChunk::StdErr(bytes) => bytes,
}
}
}
impl AsRef<Vec<u8>> for TtyChunk {
fn as_ref(&self) -> &Vec<u8> {
match self {
TtyChunk::StdIn(bytes) | TtyChunk::StdOut(bytes) | TtyChunk::StdErr(bytes) => bytes,
}
}
}
impl std::ops::Deref for TtyChunk {
type Target = Vec<u8>;
fn deref(&self) -> &Self::Target {
self.as_ref()
}
}
impl std::ops::DerefMut for TtyChunk {
fn deref_mut(&mut self) -> &mut Vec<u8> {
match self {
TtyChunk::StdIn(bytes) | TtyChunk::StdOut(bytes) | TtyChunk::StdErr(bytes) => bytes,
}
}
}
async fn decode_chunk<S>(mut stream: S) -> Option<(Result<TtyChunk>, S)>
where
S: AsyncRead + Unpin,
{
let mut header_bytes = [0u8; 8];
match stream.read_exact(&mut header_bytes).await {
Err(e) if e.kind() == futures_util::io::ErrorKind::UnexpectedEof => return None,
Err(e) => return Some((Err(Error::IO(e)), stream)),
_ => (),
}
let size_bytes = &header_bytes[4..];
let data_length = u32::from_be_bytes(size_bytes.try_into().unwrap());
let mut data = vec![0u8; data_length as usize];
if stream.read_exact(&mut data).await.is_err() {
return None;
}
let chunk = match header_bytes[0] {
0 => TtyChunk::StdIn(data),
1 => TtyChunk::StdOut(data),
2 => TtyChunk::StdErr(data),
n => panic!("invalid stream number from docker daemon: '{}'", n),
};
Some((Ok(chunk), stream))
}
pub(crate) fn decode<S>(hyper_chunk_stream: S) -> impl Stream<Item = Result<TtyChunk>>
where
S: Stream<Item = Result<hyper::body::Bytes>> + Unpin,
{
let stream = hyper_chunk_stream
.map_err(|e| io::Error::new(io::ErrorKind::Other, e))
.into_async_read();
futures_util::stream::unfold(stream, decode_chunk)
}
type TtyReader<'a> = Pin<Box<dyn Stream<Item = Result<TtyChunk>> + Send + 'a>>;
type TtyWriter<'a> = Pin<Box<dyn AsyncWrite + Send + 'a>>;
/// TTY multiplexer returned by the `attach` method.
///
/// This object can emit a stream of `TtyChunk`s and also implements `AsyncWrite` for streaming bytes to Stdin.
#[pin_project]
pub struct Multiplexer<'a> {
#[pin]
reader: TtyReader<'a>,
#[pin]
writer: TtyWriter<'a>,
}
impl<'a> Multiplexer<'a> {
pub(crate) fn new<T>(tcp_connection: T) -> Self
where
T: AsyncRead + AsyncWrite + Send + 'a,
{
let (reader, writer) = tcp_connection.split();
Self {
reader: Box::pin(futures_util::stream::unfold(reader, |reader| {
decode_chunk(reader)
})),
writer: Box::pin(writer),
}
}
}
use std::{
pin::Pin,
task::{Context, Poll},
};
impl<'a> Stream for Multiplexer<'a> {
type Item = Result<TtyChunk>;
fn poll_next(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Option<Self::Item>> {
self.project().reader.poll_next(cx)
}
}
impl<'a> AsyncWrite for Multiplexer<'a> {
fn poll_write(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<io::Result<usize>> {
self.project().writer.poll_write(cx, buf)
}
fn poll_flush(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<io::Result<()>> {
self.project().writer.poll_flush(cx)
}
fn poll_close(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<io::Result<()>> {
self.project().writer.poll_close(cx)
}
}
impl<'a> Multiplexer<'a> {
/// Split the `Multiplexer` into the component `Stream` and `AsyncWrite` parts
pub fn split(
self
) -> (
impl Stream<Item = Result<TtyChunk>> + 'a,
impl AsyncWrite + Send + 'a,
) {
(self.reader, self.writer)
}
}
|
