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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,212 @@ | ||
| use async_trait::async_trait; | ||
| use ratatui::{ | ||
| backend::CrosstermBackend, | ||
| layout::Rect, | ||
| style::{Color, Style}, | ||
| widgets::{Block, Borders, Clear, Paragraph}, | ||
| Terminal, | ||
| }; | ||
| use russh::{server::*, Channel, ChannelId}; | ||
| use russh_keys::key::PublicKey; | ||
| use std::collections::HashMap; | ||
| use std::sync::Arc; | ||
| use tokio::sync::Mutex; | ||
|
|
||
| type SshTerminal = Terminal<CrosstermBackend<TerminalHandle>>; | ||
|
|
||
| struct App { | ||
| pub counter: usize, | ||
| } | ||
|
|
||
| impl App { | ||
| pub fn new() -> App { | ||
| Self { counter: 0 } | ||
| } | ||
| } | ||
|
|
||
| #[derive(Clone)] | ||
| struct TerminalHandle { | ||
| handle: Handle, | ||
| // The sink collects the data which is finally flushed to the handle. | ||
| sink: Vec<u8>, | ||
| channel_id: ChannelId, | ||
| } | ||
|
|
||
| // The crossterm backend writes to the terminal handle. | ||
| impl std::io::Write for TerminalHandle { | ||
| fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> { | ||
| self.sink.extend_from_slice(buf); | ||
| Ok(buf.len()) | ||
| } | ||
|
|
||
| fn flush(&mut self) -> std::io::Result<()> { | ||
| let handle = self.handle.clone(); | ||
| let channel_id = self.channel_id.clone(); | ||
| let data = self.sink.clone().into(); | ||
| futures::executor::block_on(async move { | ||
| let result = handle.data(channel_id, data).await; | ||
| if result.is_err() { | ||
| eprintln!("Failed to send data: {:?}", result); | ||
| } | ||
| }); | ||
|
|
||
| self.sink.clear(); | ||
| Ok(()) | ||
| } | ||
| } | ||
|
|
||
| #[derive(Clone)] | ||
| struct AppServer { | ||
| clients: Arc<Mutex<HashMap<usize, (SshTerminal, App)>>>, | ||
| id: usize, | ||
| } | ||
|
|
||
| impl AppServer { | ||
| pub fn new() -> Self { | ||
| Self { | ||
| clients: Arc::new(Mutex::new(HashMap::new())), | ||
| id: 0, | ||
| } | ||
| } | ||
|
|
||
| pub async fn run(&mut self) -> Result<(), anyhow::Error> { | ||
| let clients = self.clients.clone(); | ||
| tokio::spawn(async move { | ||
| loop { | ||
| tokio::time::sleep(tokio::time::Duration::from_secs(1)).await; | ||
|
|
||
| for (_, (terminal, app)) in clients.lock().await.iter_mut() { | ||
| app.counter += 1; | ||
|
|
||
| terminal | ||
| .draw(|f| { | ||
| let size = f.size(); | ||
| f.render_widget(Clear, size); | ||
| let style = match app.counter % 3 { | ||
| 0 => Style::default().fg(Color::Red), | ||
| 1 => Style::default().fg(Color::Green), | ||
| _ => Style::default().fg(Color::Blue), | ||
| }; | ||
| let paragraph = Paragraph::new(format!("Counter: {}", app.counter)) | ||
| .alignment(ratatui::layout::Alignment::Center) | ||
| .style(style); | ||
| let block = Block::default() | ||
| .title("Press 'c' to reset the counter!") | ||
| .borders(Borders::ALL); | ||
| f.render_widget(paragraph.block(block), size); | ||
| }) | ||
| .unwrap(); | ||
| } | ||
| } | ||
| }); | ||
|
|
||
| let config = Config { | ||
| inactivity_timeout: Some(std::time::Duration::from_secs(3600)), | ||
| auth_rejection_time: std::time::Duration::from_secs(3), | ||
| auth_rejection_time_initial: Some(std::time::Duration::from_secs(0)), | ||
| keys: vec![russh_keys::key::KeyPair::generate_ed25519().unwrap()], | ||
| ..Default::default() | ||
| }; | ||
|
|
||
| self.run_on_address(Arc::new(config), ("0.0.0.0", 2222)) | ||
| .await?; | ||
| Ok(()) | ||
| } | ||
| } | ||
|
|
||
| impl Server for AppServer { | ||
| type Handler = Self; | ||
| fn new_client(&mut self, _: Option<std::net::SocketAddr>) -> Self { | ||
| let s = self.clone(); | ||
| self.id += 1; | ||
| s | ||
| } | ||
| } | ||
|
|
||
| #[async_trait] | ||
| impl Handler for AppServer { | ||
| type Error = anyhow::Error; | ||
|
|
||
| async fn channel_open_session( | ||
| &mut self, | ||
| channel: Channel<Msg>, | ||
| session: &mut Session, | ||
| ) -> Result<bool, Self::Error> { | ||
| { | ||
| let mut clients = self.clients.lock().await; | ||
| let terminal_handle = TerminalHandle { | ||
| handle: session.handle(), | ||
| sink: Vec::new(), | ||
| channel_id: channel.id(), | ||
| }; | ||
|
|
||
| let backend = CrosstermBackend::new(terminal_handle.clone()); | ||
| let terminal = Terminal::new(backend)?; | ||
| let app = App::new(); | ||
|
|
||
| clients.insert(self.id, (terminal, app)); | ||
| } | ||
|
|
||
| Ok(true) | ||
| } | ||
|
|
||
| async fn auth_publickey(&mut self, _: &str, _: &PublicKey) -> Result<Auth, Self::Error> { | ||
| Ok(Auth::Accept) | ||
| } | ||
|
|
||
| async fn data( | ||
| &mut self, | ||
| channel: ChannelId, | ||
| data: &[u8], | ||
| session: &mut Session, | ||
| ) -> Result<(), Self::Error> { | ||
| match data { | ||
| // Pressing 'q' closes the connection. | ||
| b"q" => { | ||
| self.clients.lock().await.remove(&self.id); | ||
| session.close(channel); | ||
| } | ||
| // Pressing 'c' resets the counter for the app. | ||
| // Only the client with the id sees the counter reset. | ||
| b"c" => { | ||
| let mut clients = self.clients.lock().await; | ||
| let (_, app) = clients.get_mut(&self.id).unwrap(); | ||
| app.counter = 0; | ||
| } | ||
| _ => {} | ||
| } | ||
|
|
||
| Ok(()) | ||
| } | ||
|
|
||
| /// The client's window size has changed. | ||
| async fn window_change_request( | ||
| &mut self, | ||
| _: ChannelId, | ||
| col_width: u32, | ||
| row_height: u32, | ||
| _: u32, | ||
| _: u32, | ||
| _: &mut Session, | ||
| ) -> Result<(), Self::Error> { | ||
| { | ||
| let mut clients = self.clients.lock().await; | ||
| let (terminal, _) = clients.get_mut(&self.id).unwrap(); | ||
| let rect = Rect { | ||
| x: 0, | ||
| y: 0, | ||
| width: col_width as u16, | ||
| height: row_height as u16, | ||
| }; | ||
| terminal.resize(rect)?; | ||
| } | ||
|
|
||
| Ok(()) | ||
| } | ||
| } | ||
|
|
||
| #[tokio::main] | ||
| async fn main() { | ||
| let mut server = AppServer::new(); | ||
| server.run().await.expect("Failed running server"); | ||
| } |
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