lesavka/client/src/app.rs

// client/src/app.rs

#![forbid(unsafe_code)]

use anyhow::Result;
use std::time::Duration;
use tokio::sync::broadcast;
use tokio_stream::{wrappers::BroadcastStream, StreamExt};
use tonic::{Request, transport::Channel};
use tracing::{debug, error, info, warn, trace};
use winit::{
    event_loop::EventLoopBuilder,
    platform::wayland::EventLoopBuilderExtWayland,
    event::Event,
};

use lesavka_common::lesavka::{relay_client::RelayClient, KeyboardReport, MouseReport, MonitorRequest, VideoPacket};

use crate::input::inputs::InputAggregator;
use crate::output::video::MonitorWindow;

pub struct LesavkaClientApp {
    aggregator: Option<InputAggregator>,
    server_addr: String,
    dev_mode: bool,
    kbd_tx: broadcast::Sender<KeyboardReport>,
    mou_tx: broadcast::Sender<MouseReport>,
}

impl LesavkaClientApp {
    pub fn new() -> Result<Self> {
        let dev_mode = std::env::var("LESAVKA_DEV_MODE").is_ok();
        let server_addr = std::env::args()
            .nth(1)
            .or_else(|| std::env::var("LESAVKA_SERVER_ADDR").ok())
            .unwrap_or_else(|| "http://127.0.0.1:50051".into());

        let (kbd_tx, _) = broadcast::channel::<KeyboardReport>(1024);
        let (mou_tx, _) = broadcast::channel::<MouseReport>(4096);

        let mut agg = InputAggregator::new(dev_mode, kbd_tx.clone(), mou_tx.clone());
        agg.init()?; // grab devices

        Ok(Self { aggregator: Some(agg),
                  server_addr, dev_mode,
                  kbd_tx, mou_tx })
    }

    pub async fn run(&mut self) -> Result<()> {
        // ---- build two channels ------------------------------------------------
        let hid_ep: Channel = Channel::from_shared(self.server_addr.clone())
            .unwrap()
            .tcp_nodelay(true)
            .concurrency_limit(1)
            .http2_keep_alive_interval(Duration::from_secs(15))
            .connect_lazy();

        let vid_ep: Channel = Channel::from_shared(self.server_addr.clone())
            .unwrap()
            .tcp_nodelay(true)
            .connect_lazy();

        /* detach the aggregator before spawn so `self` is not moved */
        let aggregator = self.aggregator.take().expect("InputAggregator present");
        let agg_task = tokio::spawn(async move {
            let mut agg = aggregator;
            agg.run().await
        });

        /* two networking tasks */
        let kbd_loop = self.stream_loop_keyboard(hid_ep.clone());
        let mou_loop = self.stream_loop_mouse(hid_ep.clone());

        /* optional suicide timer */
        let suicide = async {
            if self.dev_mode {
                tokio::time::sleep(Duration::from_secs(30)).await;
                warn!("dev‑mode timeout");
                // self.aggregator.keyboards.dev.ungrab();
                // self.aggregator.mice.dev.ungrab();
                std::process::exit(0);
            } else { futures::future::pending::<()>().await }
        };

        /* video windows use a dedicated event‑loop thread */
        let (video_tx, mut video_rx) = tokio::sync::mpsc::unbounded_channel::<VideoPacket>();
        // let (event_tx, event_rx) = std::sync::mpsc::channel();
        let (_event_tx, _event_rx) = std::sync::mpsc::channel::<()>();

        std::thread::spawn(move || {
            let el = EventLoopBuilder::<()>::new()
                .with_any_thread(true)
                .build()
                .unwrap();
            let win0 = MonitorWindow::new(0, &el).expect("win0");
            let win1 = MonitorWindow::new(1, &el).expect("win1");
        
            let _ = el.run(move |_: Event<()>, _| {
                while let Ok(pkt) = video_rx.try_recv() {
                    match pkt.id {
                        0 => win0.push_packet(pkt),
                        1 => win1.push_packet(pkt),
                        _ => {}
                    }
                }
            });
        });

        let vid_loop = Self::video_loop(vid_ep.clone(), video_tx);

        tokio::select! {
            _ = kbd_loop => unreachable!(),
            _ = mou_loop => unreachable!(),
            _ = vid_loop => unreachable!(),
            _ = suicide  => unreachable!(),
            // _ = suicide  => { warn!("dev‑mode timeout"); std::process::exit(0) },
            r = agg_task => {
                error!("aggregator task ended: {r:?}");
                std::process::exit(1)
            }
        }
    }

    /*──────────────── keyboard stream ───────────────*/
    async fn stream_loop_keyboard(&self, ep: Channel) {
        loop {
            info!("⌨️  connect {}", self.server_addr);
            // let mut cli = match RelayClient::connect(self.server_addr.clone()).await {
            //     Ok(c) => c,
            //     Err(e) => { error!("connect: {e}"); Self::delay().await; continue }
            // };
            let mut cli = RelayClient::new(ep.clone());

            let outbound = BroadcastStream::new(self.kbd_tx.subscribe()).filter_map(|r| r.ok());
            match cli.stream_keyboard(Request::new(outbound)).await {
                Ok(mut resp) => {
                    // spawn a task just to drain echoes (keeps h2 window happy)
                    tokio::spawn(async move {
                        while let Some(_)= resp.get_mut().message().await.transpose() {}
                        warn!("⌨️  server closed stream");
                    });
                }
                Err(e) => {
                    error!("stream_keyboard: {e}");
                    Self::delay().await;
                    continue;
                }
            }
            // from now on we just park – connection persists until it errors
            futures::future::pending::<()>().await;

            // drop(resp);
            // warn!("⌨️  disconnected");
            // Self::delay().await;
        }
    }

    /*──────────────── mouse stream ──────────────────*/
    async fn stream_loop_mouse(&self, ep: Channel) {
        loop {
            info!("🖱️  connect {}", self.server_addr);
            // let mut cli = match RelayClient::connect(self.server_addr.clone()).await {
            //     Ok(c) => c,
            //     Err(e) => { error!("connect: {e}"); Self::delay().await; continue }
            // };
            let mut cli = RelayClient::new(ep.clone());

            let outbound = BroadcastStream::new(self.mou_tx.subscribe()).filter_map(|r| r.ok());
            match cli.stream_mouse(Request::new(outbound)).await {
                Ok(mut resp) => {
                    // spawn a task just to drain echoes (keeps h2 window happy)
                    tokio::spawn(async move {
                        while let Some(_)= resp.get_mut().message().await.transpose() {}
                        warn!("⌨️  server closed stream");
                    });
                }
                Err(e) => {
                    error!("stream_mouse: {e}");
                    Self::delay().await;
                    continue;
                }
            }
            // from now on we just park – connection persists until it errors
            futures::future::pending::<()>().await;
            // drop(resp);
            // warn!("🖱️  disconnected");
            // Self::delay().await;
        }
    }

    /*──────────────── monitor stream ────────────────*/
    async fn video_loop(ep: Channel, tx: tokio::sync::mpsc::UnboundedSender<VideoPacket>) {
        loop {
            let mut cli = RelayClient::new(ep.clone());
                for monitor_id in 0..=1 {
                    let req = MonitorRequest { id: monitor_id, max_bitrate: 6_000 };
                    if let Ok(mut stream) = cli.capture_video(Request::new(req)).await {
                        while let Some(pkt) = stream.get_mut().message().await.transpose() {
                            match pkt {
                                Ok(p) => { let _ = tx.send(p); }
                                Err(e) => { error!("video {monitor_id}: {e}"); break }
                            }
                        }
                    }
                }
            tokio::time::sleep(Duration::from_secs(2)).await;
        }
    }

    #[inline(always)]
    async fn delay() { tokio::time::sleep(Duration::from_secs(1)).await; }
}