1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
//! Types for working with docker TTY streams
use crate::{Error, Result};
use bytes::{BigEndian, ByteOrder};
use futures_util::{
io::{AsyncRead, AsyncReadExt, AsyncWrite},
stream::{Stream, TryStreamExt},
};
use pin_project::pin_project;
use std::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 = vec![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 = BigEndian::read_u32(size_bytes);
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)
}
}
|
