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CH-J / Server Manager 1704 pliki
0.1.2-beta Dodano: · Built:
exec.rs Dodano: Data niezanotowana 5,5 KB · 159 linie
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1//! Exec channels over an existing SSH connection (port of `_execFixed`/`_execStream`).
2//! Output is decoded incrementally, bounded by an output limit and a deadline, and the
3//! channel is cancelled when the session is lost. No API accepts commands from the UI:
4//! callers are Core services with fixed scripts.
6use crate::core::error::{CoreError, CoreResult};
7use crate::core::ssh::utf8::Utf8Decoder;
8use russh::client::Msg;
9use russh::{ChannelMsg, ChannelReadHalf, ChannelWriteHalf};
10use std::time::Duration;
11use tokio::sync::watch;
12use tokio::time::Instant;
14pub const MAX_COMMAND_OUTPUT: usize = 512 * 1024;
16#[derive(Debug, Clone, PartialEq, Eq)]
17pub enum ExecEvent {
18 Stdout,
19 Stderr,
20 Done,
23#[derive(Debug, Clone)]
24pub struct ExecResult {
25 pub code: Option<i64>,
26 pub signal: Option<String>,
27 pub stdout: String,
28 pub stderr: String,
31pub struct ExecChannel {
32 read: ChannelReadHalf,
33 write: ChannelWriteHalf<Msg>,
34 pub stdout: String,
35 pub stderr: String,
36 decode_out: Utf8Decoder,
37 decode_err: Utf8Decoder,
38 received: usize,
39 limit: usize,
40 deadline: Instant,
41 lost: watch::Receiver<bool>,
42 code: Option<i64>,
43 signal: Option<String>,
44 done: bool,
45 eof_sent: bool,
48impl ExecChannel {
49 pub fn new(read: ChannelReadHalf, write: ChannelWriteHalf<Msg>, timeout: Duration, limit: usize, lost: watch::Receiver<bool>) -> Self {
50 Self {
51 read,
52 write,
53 stdout: String::new(),
54 stderr: String::new(),
55 decode_out: Utf8Decoder::default(),
56 decode_err: Utf8Decoder::default(),
57 received: 0,
58 limit,
59 deadline: Instant::now() + timeout,
60 lost,
61 code: None,
62 signal: None,
63 done: false,
64 eof_sent: false,
65 }
66 }
68 pub async fn write(&self, data: &[u8]) {
69 if self.done || self.eof_sent {
70 return;
71 }
72 let _ = self.write.data_bytes(data.to_vec()).await;
73 }
75 pub async fn eof(&mut self) {
76 if !self.eof_sent && !self.done {
77 self.eof_sent = true;
78 let _ = self.write.eof().await;
79 }
80 }
82 pub async fn close(&self) {
83 let _ = self.write.close().await;
84 }
86 pub fn is_done(&self) -> bool {
87 self.done
88 }
90 /// Waits for the next output chunk (appended to `stdout`/`stderr`) or the end of the channel.
91 pub async fn next(&mut self) -> CoreResult<ExecEvent> {
92 if self.done {
93 return Ok(ExecEvent::Done);
94 }
95 if *self.lost.borrow() {
96 return Err(CoreError::new("SESSION_NOT_CONNECTED", "The SSH connection was lost."));
97 }
98 loop {
99 let message = tokio::select! {
100 _ = tokio::time::sleep_until(self.deadline) => {
101 self.close().await;
102 return Err(CoreError::new("REMOTE_COMMAND_TIMEOUT", "The remote command timed out."));
103 }
104 changed = self.lost.changed() => {
105 if changed.is_err() || *self.lost.borrow() {
106 return Err(CoreError::new("SESSION_NOT_CONNECTED", "The SSH connection was lost."));
107 }
108 continue;
109 }
110 message = self.read.wait() => message,
111 };
112 match message {
113 Some(ChannelMsg::Data { data }) => {
114 self.account(data.len()).await?;
115 let text = self.decode_out.write(&data);
116 self.stdout.push_str(&text);
117 return Ok(ExecEvent::Stdout);
118 }
119 Some(ChannelMsg::ExtendedData { data, ext }) => {
120 self.account(data.len()).await?;
121 if ext == 1 {
122 let text = self.decode_err.write(&data);
123 self.stderr.push_str(&text);
124 return Ok(ExecEvent::Stderr);
125 }
126 }
127 Some(ChannelMsg::ExitStatus { exit_status }) => self.code = Some(exit_status as i64),
128 Some(ChannelMsg::ExitSignal { signal_name, .. }) => self.signal = Some(format!("{signal_name:?}")),
129 Some(ChannelMsg::Close) | None => {
130 self.done = true;
131 let rest = self.decode_out.end();
132 self.stdout.push_str(&rest);
133 let rest = self.decode_err.end();
134 self.stderr.push_str(&rest);
135 return Ok(ExecEvent::Done);
136 }
137 Some(ChannelMsg::OpenFailure(reason)) => {
138 return Err(CoreError::new("REMOTE_COMMAND_FAILED", format!("The remote channel could not be opened: {reason:?}")));
139 }
140 Some(_) => {}
141 }
142 }
143 }
145 async fn account(&mut self, length: usize) -> CoreResult<()> {
146 self.received += length;
147 if self.received > self.limit {
148 self.close().await;
149 return Err(CoreError::new("REMOTE_OUTPUT_TOO_LARGE", "The remote response is too large."));
150 }
151 Ok(())
152 }
154 /// Reads until the channel closes; returns the exit code instead of failing on non-zero.
155 pub async fn finish(mut self) -> CoreResult<ExecResult> {
156 while self.next().await? != ExecEvent::Done {}
157 Ok(ExecResult { code: self.code, signal: self.signal.clone(), stdout: std::mem::take(&mut self.stdout), stderr: std::mem::take(&mut self.stderr) })
158 }
SHA-2563e05e5be6436c67a8d11152dd826bf8699f7fee2c807834b0a965ad3705afd2b

CH-J Proprietary Software License 1.14 · Źródło jest dostarczane pod CH-J Proprietary Software License 1.14. Jego dostępność nie zmienia warunków licencji ani nie przyznaje dodatkowych praw.

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