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use anyhow::Result;
use crossterm::event::{self, Event, KeyCode, KeyEvent, KeyModifiers};
use crossterm::terminal;
use futures_util::future::FutureExt;
use std::io::Write;
use tokio::io::AsyncReadExt;
use tokio::select;
use tokio::sync::mpsc;
use tokio::time::Duration;
use crate::commands::ssh::common::{SessionTermination, parse_server_error, reset_terminal};
use crate::controllers::terminal::TerminalClient;
// stub function because Windows does not support signals
pub async fn setup_signal_handlers() -> Result<()> {
Ok(())
}
// Messages that can be sent to the UI task
enum UiMessage {
// Server message handler has completed with termination status
ServerDone(SessionTermination),
// Shell is ready for input (combines ready and not in command progress)
ReadyForInput(bool),
// Shell is ready (needed for signals and window resizing)
ShellReady(bool),
}
// Messages that can be sent to the server task
enum ServerMessage {
// Send data to the server
SendData(String),
// Send a signal to the server
SendSignal(u8),
// Resize the terminal window
WindowResize(u16, u16),
}
/// Windows-specific event handling for the SSH session
pub async fn run_interactive_session(client: TerminalClient) -> Result<SessionTermination> {
#[cfg(feature = "event-stream")]
let result = run_with_event_stream(client).await;
#[cfg(not(feature = "event-stream"))]
let result = run_with_polling(client).await;
// Clean up terminal
reset_terminal(false)?;
result
}
#[cfg(feature = "event-stream")]
async fn run_with_event_stream(mut client: TerminalClient) -> Result<SessionTermination> {
let mut stdin = tokio::io::stdin();
let mut stdin_buf = [0u8; 1024];
let mut termination = None;
let mut event_stream = crossterm::event::EventStream::new();
let (ui_tx, mut ui_rx) = mpsc::channel::<UiMessage>(100);
let (server_tx, mut server_rx) = mpsc::channel::<ServerMessage>(100);
let mut shell_ready = client.is_ready();
let mut ready_for_input = client.is_ready_for_input();
tokio::spawn(async move {
loop {
select! {
// Handle incoming messages from the UI task
Some(msg) = server_rx.recv() => {
match msg {
ServerMessage::SendData(data) => {
if let Err(e) = client.send_data(&data).await {
eprintln!("Error sending data: {}", e);
let _ = ui_tx.send(UiMessage::ServerDone(
SessionTermination::ServerError(e.to_string())
)).await;
break;
}
},
ServerMessage::SendSignal(signal) => {
if let Err(e) = client.send_signal(signal).await {
eprintln!("Error sending signal: {}", e);
}
},
ServerMessage::WindowResize(cols, rows) => {
if let Err(e) = client.send_window_size(cols, rows).await {
eprintln!("Error resizing window: {}", e);
}
}
}
}
// Process messages from the server
result = client.handle_server_messages() => {
match result {
Ok(()) => {
let _ = ui_tx.send(UiMessage::ServerDone(
SessionTermination::Complete
)).await;
},
Err(e) => {
eprintln!("Error in server messages: {}", e);
let _ = ui_tx.send(UiMessage::ServerDone(
SessionTermination::ServerError(e.to_string())
)).await;
}
}
break;
}
}
if shell_ready != client.is_ready() {
shell_ready = client.is_ready();
let _ = ui_tx.send(UiMessage::ShellReady(shell_ready)).await;
}
if ready_for_input != client.is_ready_for_input() {
ready_for_input = client.is_ready_for_input();
let _ = ui_tx.send(UiMessage::ReadyForInput(ready_for_input)).await;
}
}
});
// Main event loop for input and events
loop {
select! {
// Handle crossterm events for Windows with event-stream
maybe_event = event_stream.next().fuse() => {
if let Some(Ok(event)) = maybe_event {
match event {
Event::Key(KeyEvent { code: KeyCode::Char('c'), modifiers, .. }) if modifiers.contains(KeyModifiers::CONTROL) => {
// Handle Ctrl+C like SIGINT
if shell_ready {
let _ = server_tx.send(ServerMessage::SendSignal(2)).await;
}
},
Event::Resize(width, height) => {
// Handle terminal resize
if shell_ready {
let _ = server_tx.send(ServerMessage::WindowResize(width, height)).await;
}
},
Event::Key(key) => {
// Only handle key input if ready for input
if ready_for_input {
if let Some(input) = key_event_to_string(key) {
let _ = server_tx.send(ServerMessage::SendData(input)).await;
}
}
},
_ => {}
}
}
}
// Handle input from stdin (if using both stdin and events)
result = stdin.read(&mut stdin_buf) => {
if ready_for_input {
match result {
Ok(0) => break, // EOF
Ok(n) => {
let data = String::from_utf8_lossy(&stdin_buf[..n]).to_string();
let _ = server_tx.send(ServerMessage::SendData(data)).await;
}
Err(e) => {
eprintln!("Error reading from stdin: {}", e);
termination = Some(SessionTermination::StdinError(e.to_string()));
break;
}
}
}
}
// Process messages from server task
Some(msg) = ui_rx.recv() => {
match msg {
UiMessage::ServerDone(term) => {
termination = Some(term);
break;
},
UiMessage::ShellReady(ready) => {
shell_ready = ready;
},
UiMessage::ReadyForInput(input_ready) => {
ready_for_input = input_ready;
}
}
}
}
}
Ok(termination.unwrap_or(SessionTermination::Complete))
}
#[cfg(not(feature = "event-stream"))]
async fn run_with_polling(mut client: TerminalClient) -> Result<SessionTermination> {
let mut stdin = tokio::io::stdin();
let mut stdin_buf = [0u8; 1024];
let mut termination = None;
let event_poll_timeout = Duration::from_millis(100);
let (ui_tx, mut ui_rx) = mpsc::channel::<UiMessage>(100);
let (server_tx, mut server_rx) = mpsc::channel::<ServerMessage>(100);
let mut shell_ready = client.is_ready();
let mut ready_for_input = client.is_ready_for_input();
tokio::spawn(async move {
loop {
select! {
// Handle incoming messages from the UI task
Some(msg) = server_rx.recv() => {
match msg {
ServerMessage::SendData(data) => {
if let Err(e) = client.send_data(&data).await {
eprintln!("Error sending data: {}", e);
let _ = ui_tx.send(UiMessage::ServerDone(
SessionTermination::ServerError(e.to_string())
)).await;
break;
}
},
ServerMessage::SendSignal(signal) => {
if let Err(e) = client.send_signal(signal).await {
eprintln!("Error sending signal: {}", e);
}
},
ServerMessage::WindowResize(cols, rows) => {
if let Err(e) = client.send_window_size(cols, rows).await {
eprintln!("Error resizing window: {}", e);
}
}
}
}
// Process messages from the server
result = client.handle_server_messages() => {
match result {
Ok(()) => {
let _ = ui_tx.send(UiMessage::ServerDone(
SessionTermination::Complete
)).await;
},
Err(e) => {
eprintln!("Error in server messages: {}", e);
let _ = ui_tx.send(UiMessage::ServerDone(
SessionTermination::ServerError(e.to_string())
)).await;
}
}
break;
}
}
if shell_ready != client.is_ready() {
shell_ready = client.is_ready();
let _ = ui_tx.send(UiMessage::ShellReady(shell_ready)).await;
}
if ready_for_input != client.is_ready_for_input() {
ready_for_input = client.is_ready_for_input();
let _ = ui_tx.send(UiMessage::ReadyForInput(ready_for_input)).await;
}
}
});
// Main event loop for input and polling events
loop {
select! {
// Handle input from stdin
result = stdin.read(&mut stdin_buf) => {
if ready_for_input {
match result {
Ok(0) => break, // EOF
Ok(n) => {
let data = String::from_utf8_lossy(&stdin_buf[..n]).to_string();
let _ = server_tx.send(ServerMessage::SendData(data)).await;
}
Err(e) => {
eprintln!("Error reading from stdin: {}", e);
termination = Some(SessionTermination::StdinError(e.to_string()));
break;
}
}
}
}
// Process messages from server task
Some(msg) = ui_rx.recv() => {
match msg {
UiMessage::ServerDone(term) => {
termination = Some(term);
break;
},
UiMessage::ShellReady(ready) => {
shell_ready = ready;
},
UiMessage::ReadyForInput(input_ready) => {
ready_for_input = input_ready;
}
}
}
// Poll for crossterm events
_ = tokio::time::sleep(event_poll_timeout) => {
if event::poll(Duration::from_millis(0))? {
match event::read()? {
Event::Key(KeyEvent { code: KeyCode::Char('c'), modifiers, .. }) if modifiers.contains(KeyModifiers::CONTROL) => {
// Handle Ctrl+C like SIGINT
if shell_ready {
let _ = server_tx.send(ServerMessage::SendSignal(2)).await;
}
},
Event::Resize(width, height) => {
// Handle terminal resize
if shell_ready {
let _ = server_tx.send(ServerMessage::WindowResize(width, height)).await;
}
},
Event::Key(key) => {
// Only handle key input if ready for input
if ready_for_input {
if let Some(input) = key_event_to_string(key) {
let _ = server_tx.send(ServerMessage::SendData(input)).await;
}
}
},
_ => {}
}
}
}
}
}
Ok(termination.unwrap_or(SessionTermination::Complete))
}
// Helper function to convert key events to strings
fn key_event_to_string(key: KeyEvent) -> Option<String> {
match key.code {
KeyCode::Char(c) => Some(c.to_string()),
KeyCode::Enter => Some("\r".to_string()),
KeyCode::Backspace => Some("\x08".to_string()),
KeyCode::Esc => Some("\x1b".to_string()),
_ => None,
}
}