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#[cfg(unix)]
mod unix;
#[cfg(unix)]
pub(crate) use unix::*;
#[cfg(windows)]
mod windows {
use std::io::{Read, Write};
use std::sync::{mpsc as std_mpsc, Arc, Mutex};
use std::time::Duration;
use bytes::Bytes;
use portable_pty::{MasterPty, PtySize};
use tokio::sync::mpsc;
use tracing::{debug, warn};
pub(crate) struct PtyReadResult {
pub terminal_responses: Vec<Bytes>,
}
type ReadCallback = Box<dyn FnMut(&[u8]) -> PtyReadResult + Send + 'static>;
type ReaderExitCallback = Box<dyn FnOnce() + Send + 'static>;
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
struct PtyResize {
rows: u16,
cols: u16,
cell_width_px: u32,
cell_height_px: u32,
}
struct PtyResizeRequest {
resize: PtyResize,
terminal_responses: Vec<Bytes>,
}
pub(crate) struct PtyIoActorConfig {
pub pane_id: u32,
pub master: Box<dyn MasterPty + Send>,
pub initially_quiesced: bool,
pub on_read: ReadCallback,
pub on_reader_exit: Option<ReaderExitCallback>,
}
enum PtyIoControlCommand {
Resize(PtyResizeRequest),
Shutdown,
}
#[derive(Clone)]
pub(crate) struct PtyIoActorHandle {
data_tx: mpsc::Sender<Bytes>,
control_tx: std_mpsc::Sender<PtyIoControlCommand>,
accepting: Arc<Mutex<bool>>,
}
impl PtyIoActorHandle {
pub(crate) async fn write_user_input(
&self,
bytes: Bytes,
) -> Result<(), mpsc::error::SendError<Bytes>> {
if !*self
.accepting
.lock()
.unwrap_or_else(|poisoned| poisoned.into_inner())
{
return Err(mpsc::error::SendError(bytes));
}
self.data_tx.send(bytes).await
}
pub(crate) fn try_write_user_input(
&self,
bytes: Bytes,
) -> Result<(), mpsc::error::TrySendError<Bytes>> {
if !*self
.accepting
.lock()
.unwrap_or_else(|poisoned| poisoned.into_inner())
{
return Err(mpsc::error::TrySendError::Closed(bytes));
}
self.data_tx.try_send(bytes)
}
pub(crate) fn resize(
&self,
rows: u16,
cols: u16,
cell_width_px: u32,
cell_height_px: u32,
terminal_responses: Vec<Bytes>,
) {
let _ = self
.control_tx
.send(PtyIoControlCommand::Resize(PtyResizeRequest {
resize: PtyResize {
rows,
cols,
cell_width_px,
cell_height_px,
},
terminal_responses,
}));
}
pub(crate) fn shutdown(&self) {
if let Ok(mut accepting) = self.accepting.lock() {
*accepting = false;
}
let _ = self.control_tx.send(PtyIoControlCommand::Shutdown);
}
}
pub(crate) struct PtyIoActor;
impl PtyIoActor {
pub(crate) fn spawn(config: PtyIoActorConfig) -> std::io::Result<PtyIoActorHandle> {
let PtyIoActorConfig {
pane_id,
master,
initially_quiesced,
mut on_read,
on_reader_exit,
} = config;
let mut reader = master
.try_clone_reader()
.map_err(|err| std::io::Error::other(err.to_string()))?;
let writer = master
.take_writer()
.map_err(|err| std::io::Error::other(err.to_string()))?;
let writer = Arc::new(Mutex::new(writer));
let (data_tx, mut data_rx) = mpsc::channel::<Bytes>(1024);
let (control_tx, control_rx) = std_mpsc::channel::<PtyIoControlCommand>();
let accepting = Arc::new(Mutex::new(!initially_quiesced));
{
let writer = Arc::clone(&writer);
std::thread::spawn(move || {
while let Some(bytes) = data_rx.blocking_recv() {
if write_all_locked(&writer, &bytes).is_err() {
break;
}
}
debug!(pane_id, "windows pty writer thread exiting");
});
}
{
let writer = Arc::clone(&writer);
std::thread::spawn(move || {
let mut buf = [0u8; 8192];
loop {
match reader.read(&mut buf) {
Ok(0) => break,
Ok(n) => {
let result = on_read(&buf[..n]);
for response in result.terminal_responses {
if write_all_locked(&writer, &response).is_err() {
break;
}
}
}
Err(err) => {
debug!(pane_id, err = %err, "windows pty reader failed");
break;
}
}
}
if let Some(on_reader_exit) = on_reader_exit {
on_reader_exit();
}
debug!(pane_id, "windows pty reader thread exiting");
});
}
{
let writer = Arc::clone(&writer);
std::thread::spawn(move || {
for command in control_rx {
match command {
PtyIoControlCommand::Resize(request) => {
let size = request.resize;
if let Err(err) = master.resize(PtySize {
rows: size.rows,
cols: size.cols,
pixel_width: size.cell_width_px.min(u16::MAX as u32) as u16,
pixel_height: size.cell_height_px.min(u16::MAX as u32) as u16,
}) {
warn!(pane_id, err = %err, "windows pty resize failed");
}
for response in request.terminal_responses {
if write_all_locked(&writer, &response).is_err() {
break;
}
}
}
PtyIoControlCommand::Shutdown => break,
}
}
debug!(pane_id, "windows pty control thread exiting");
});
}
Ok(PtyIoActorHandle {
data_tx,
control_tx,
accepting,
})
}
}
fn write_all_locked(
writer: &Arc<Mutex<Box<dyn Write + Send>>>,
bytes: &[u8],
) -> std::io::Result<()> {
let mut writer = writer
.lock()
.unwrap_or_else(|poisoned| poisoned.into_inner());
writer.write_all(bytes)?;
writer.flush()
}
#[allow(dead_code)]
fn _assert_duration_send(_: Duration) {}
}
#[cfg(windows)]
pub(crate) use windows::*;
|
