basic enter hook command

prevents unnecessary state updates and makes synchronization less error prone

.github/workflows/cachix.yml

@@ -7,7 +7,7 @@ jobs:
       matrix:
        os: 
         - ubuntu-latest
-        - macos-latest
+        - macos-13
         - macos-14
     name: "Build"
     runs-on: ${{ matrix.os }} 
@@ -31,7 +31,7 @@ jobs:
       run: nix build --print-build-logs --show-trace .#packages.x86_64-linux.lan-mouse
 
     - name: Build lan-mouse (x86_64-darwin)
-      if: matrix.os == 'macos-latest'
+      if: matrix.os == 'macos-13'
       run: nix build --print-build-logs --show-trace .#packages.x86_64-darwin.lan-mouse
 
     - name: Build lan-mouse (aarch64-darwin)

.github/workflows/pre-release.yml

@@ -78,7 +78,7 @@ jobs:
         path: lan-mouse-windows.zip
 
   macos-release-build:
-    runs-on: macos-latest
+    runs-on: macos-13
     steps:
     - uses: actions/checkout@v4
     - name: install dependencies

.github/workflows/rust.yml

@@ -92,7 +92,7 @@ jobs:
           target/debug/*.dll
 
   build-macos:
-    runs-on: macos-latest
+    runs-on: macos-13
     steps:
     - uses: actions/checkout@v4
     - name: install dependencies

.github/workflows/tagged-release.yml

@@ -74,7 +74,7 @@ jobs:
         path: lan-mouse-windows.zip
 
   macos-release-build:
-    runs-on: macos-latest
+    runs-on: macos-13
     steps:
     - uses: actions/checkout@v4
     - name: install dependencies

Cargo.toml

@@ -22,7 +22,7 @@ anyhow = "1.0.71"
 log = "0.4.20"
 env_logger = "0.11.3"
 serde_json = "1.0.107"
-tokio = {version = "1.32.0", features = ["io-util", "io-std", "macros", "net", "rt", "sync", "signal"] }
+tokio = {version = "1.32.0", features = ["io-util", "io-std", "macros", "net", "process", "rt", "sync", "signal"] }
 async-trait = "0.1.73"
 futures-core = "0.3.28"
 futures = "0.3.28"

src/capture/windows.rs

@@ -14,7 +14,7 @@ use std::task::ready;
 use std::{io, pin::Pin, thread};
 use tokio::sync::mpsc::{channel, Receiver, Sender};
 use windows::core::{w, PCWSTR};
-use windows::Win32::Foundation::{FALSE, HINSTANCE, HWND, LPARAM, LRESULT, WPARAM};
+use windows::Win32::Foundation::{FALSE, HINSTANCE, HWND, LPARAM, LRESULT, RECT, WPARAM};
 use windows::Win32::Graphics::Gdi::{
     EnumDisplayDevicesW, EnumDisplaySettingsW, DEVMODEW, DISPLAY_DEVICEW,
     DISPLAY_DEVICE_ATTACHED_TO_DESKTOP, ENUM_CURRENT_SETTINGS,
@@ -43,7 +43,6 @@ use crate::{
     event::Event,
     scancode,
 };
-use crate::display_util::{DirectedLine, Display, Point};
 
 pub struct WindowsInputCapture {
     event_rx: Receiver<(ClientHandle, Event)>,
@@ -94,7 +93,7 @@ unsafe fn get_event_tid() -> Option<u32> {
     }
 }
 
-static mut ENTRY_POINT: Point<i32> = Point { x: 0, y: 0 };
+static mut ENTRY_POINT: (i32, i32) = (0, 0);
 
 fn to_mouse_event(wparam: WPARAM, lparam: LPARAM) -> Option<PointerEvent> {
     let mouse_low_level: MSLLHOOKSTRUCT =
@@ -131,12 +130,13 @@ fn to_mouse_event(wparam: WPARAM, lparam: LPARAM) -> Option<PointerEvent> {
             state: 0,
         }),
         WPARAM(p) if p == WM_MOUSEMOVE as usize => unsafe {
-            let current = Point { x: mouse_low_level.pt.x, y: mouse_low_level.pt.y };
+            let (x, y) = (mouse_low_level.pt.x, mouse_low_level.pt.y);
-            let diff = current - ENTRY_POINT;
+            let (ex, ey) = ENTRY_POINT;
+            let (dx, dy) = (x - ex, y - ey);
             Some(PointerEvent::Motion {
                 time: 0,
-                relative_x: diff.x as f64,
+                relative_x: dx as f64,
-                relative_y: diff.y as f64,
+                relative_y: dy as f64,
             })
         },
         WPARAM(p) if p == WM_MOUSEWHEEL as usize => Some(PointerEvent::AxisDiscrete120 {
@@ -210,6 +210,31 @@ unsafe fn to_key_event(wparam: WPARAM, lparam: LPARAM) -> Option<KeyboardEvent>
     }
 }
 
+///
+/// clamp point to display bounds
+///
+/// # Arguments
+///
+/// * `prev_point`: coordinates, the cursor was before entering, within bounds of a display
+/// * `entry_point`: point to clamp
+///
+/// returns: (i32, i32), the corrected entry point
+///
+fn clamp_to_display_bounds(prev_point: (i32, i32), point: (i32, i32)) -> (i32, i32) {
+    /* find display where movement came from */
+    let display_regions = unsafe { get_display_regions() };
+    let display = display_regions
+        .iter()
+        .find(|&d| is_within_dp_region(prev_point, d))
+        .unwrap();
+
+    /* clamp to bounds (inclusive) */
+    let (x, y) = point;
+    let (min_x, max_x) = (display.left, display.right - 1);
+    let (min_y, max_y) = (display.top, display.bottom - 1);
+    (x.clamp(min_x, max_x), y.clamp(min_y, max_y))
+}
+
 unsafe fn send_blocking(event: Event) {
     if let Some(active) = ACTIVE_CLIENT {
         block_on(async move {
@@ -224,9 +249,8 @@ unsafe fn check_client_activation(wparam: WPARAM, lparam: LPARAM) -> bool {
     }
     let mouse_low_level: MSLLHOOKSTRUCT =
         unsafe { *std::mem::transmute::<LPARAM, *const MSLLHOOKSTRUCT>(lparam) };
-    static mut PREV_POS: Option<Point<i32>> = None;
+    static mut PREV_POS: Option<(i32, i32)> = None;
-    let curr_pos = Point { x: mouse_low_level.pt.x, y: mouse_low_level.pt.y};
+    let curr_pos = (mouse_low_level.pt.x, mouse_low_level.pt.y);
-    log::warn!("POSITION: {curr_pos:?} - display: {:?}", curr_pos.display_in_bounds(get_display_regions()));
     let prev_pos = PREV_POS.unwrap_or(curr_pos);
     PREV_POS.replace(curr_pos);
 
@@ -239,8 +263,7 @@ unsafe fn check_client_activation(wparam: WPARAM, lparam: LPARAM) -> bool {
     }
 
     /* check if a client was activated */
-    let line = DirectedLine { start: prev_pos, end: curr_pos };
+    let Some(pos) = entered_barrier(prev_pos, curr_pos, get_display_regions()) else {
-    let Some((display, pos)) = line.crossed_display_bounds(get_display_regions()) else {
         return ret;
     };
 
@@ -251,7 +274,7 @@ unsafe fn check_client_activation(wparam: WPARAM, lparam: LPARAM) -> bool {
 
     /* update active client and entry point */
     ACTIVE_CLIENT.replace(*client);
-    ENTRY_POINT = curr_pos.clamp_to_display(&display);
+    ENTRY_POINT = clamp_to_display_bounds(prev_pos, curr_pos);
 
     /* notify main thread */
     log::debug!("ENTERED @ {prev_pos:?} -> {curr_pos:?}");
@@ -324,7 +347,7 @@ unsafe extern "system" fn window_proc(
     LRESULT(1)
 }
 
-fn enumerate_displays() -> Vec<Display<i32>> {
+fn enumerate_displays() -> Vec<RECT> {
     unsafe {
         let mut display_rects = vec![];
         let mut devices = vec![];
@@ -356,11 +379,11 @@ fn enumerate_displays() -> Vec<Display<i32>> {
             let (x, y) = (pos.x, pos.y);
             let (width, height) = (dev_mode.dmPelsWidth, dev_mode.dmPelsHeight);
 
-            display_rects.push(Display {
+            display_rects.push(RECT {
                 left: x,
-                right: x + width as i32 - 1,
+                right: x + width as i32,
                 top: y,
-                bottom: y + height as i32 - 1,
+                bottom: y + height as i32,
             });
         }
         display_rects
@@ -369,8 +392,8 @@ fn enumerate_displays() -> Vec<Display<i32>> {
 
 static mut DISPLAY_RESOLUTION_CHANGED: bool = true;
 
-unsafe fn get_display_regions() -> &'static Vec<Display<i32>> {
+unsafe fn get_display_regions() -> &'static Vec<RECT> {
-    static mut DISPLAYS: Vec<Display<i32>> = vec![];
+    static mut DISPLAYS: Vec<RECT> = vec![];
     if DISPLAY_RESOLUTION_CHANGED {
         DISPLAYS = enumerate_displays();
         DISPLAY_RESOLUTION_CHANGED = false;
@@ -379,6 +402,73 @@ unsafe fn get_display_regions() -> &'static Vec<Display<i32>> {
     &*addr_of!(DISPLAYS)
 }
 
+fn is_within_dp_region(point: (i32, i32), display: &RECT) -> bool {
+    [
+        Position::Left,
+        Position::Right,
+        Position::Top,
+        Position::Bottom,
+    ]
+    .iter()
+    .all(|&pos| is_within_dp_boundary(point, display, pos))
+}
+fn is_within_dp_boundary(point: (i32, i32), display: &RECT, pos: Position) -> bool {
+    let (x, y) = point;
+    match pos {
+        Position::Left => display.left <= x,
+        Position::Right => display.right > x,
+        Position::Top => display.top <= y,
+        Position::Bottom => display.bottom > y,
+    }
+}
+
+/// returns whether the given position is within the display bounds with respect to the given
+/// barrier position
+///
+/// # Arguments
+///
+/// * `x`:
+/// * `y`:
+/// * `displays`:
+/// * `pos`:
+///
+/// returns: bool
+///
+fn in_bounds(point: (i32, i32), displays: &[RECT], pos: Position) -> bool {
+    displays
+        .iter()
+        .any(|d| is_within_dp_boundary(point, d, pos))
+}
+
+fn in_display_region(point: (i32, i32), displays: &[RECT]) -> bool {
+    displays.iter().any(|d| is_within_dp_region(point, d))
+}
+
+fn moved_across_boundary(
+    prev_pos: (i32, i32),
+    curr_pos: (i32, i32),
+    displays: &[RECT],
+    pos: Position,
+) -> bool {
+    /* was within bounds, but is not anymore */
+    in_display_region(prev_pos, displays) && !in_bounds(curr_pos, displays, pos)
+}
+
+fn entered_barrier(
+    prev_pos: (i32, i32),
+    curr_pos: (i32, i32),
+    displays: &[RECT],
+) -> Option<Position> {
+    [
+        Position::Left,
+        Position::Right,
+        Position::Top,
+        Position::Bottom,
+    ]
+    .into_iter()
+    .find(|&pos| moved_across_boundary(prev_pos, curr_pos, displays, pos))
+}
+
 fn get_msg() -> Option<MSG> {
     unsafe {
         let mut msg = std::mem::zeroed();

src/client.rs

@@ -102,6 +102,8 @@ pub struct ClientConfig {
     pub port: u16,
     /// position of a client on screen
     pub pos: Position,
+    /// enter hook
+    pub cmd: Option<String>,
 }
 
 impl Default for ClientConfig {
@@ -111,6 +113,7 @@ impl Default for ClientConfig {
             hostname: Default::default(),
             fix_ips: Default::default(),
             pos: Default::default(),
+            cmd: None,
         }
     }
 }

src/config.rs

@@ -31,6 +31,7 @@ pub struct TomlClient {
     pub ips: Option<Vec<IpAddr>>,
     pub port: Option<u16>,
     pub activate_on_startup: Option<bool>,
+    pub enter_hook: Option<String>,
 }
 
 impl ConfigToml {
@@ -92,6 +93,7 @@ pub struct ConfigClient {
     pub port: u16,
     pub pos: Position,
     pub active: bool,
+    pub enter_hook: Option<String>,
 }
 
 const DEFAULT_RELEASE_KEYS: [scancode::Linux; 4] =
@@ -208,12 +210,14 @@ impl Config {
                     None => c.host_name.clone(),
                 };
                 let active = c.activate_on_startup.unwrap_or(false);
+                let enter_hook = c.enter_hook.clone();
                 ConfigClient {
                     ips,
                     hostname,
                     port,
                     pos: *pos,
                     active,
+                    enter_hook,
                 }
             })
             .collect()

src/display_util.rs

@@ -1,114 +0,0 @@
-use std::ops::{Add, Mul, Sub};
-use crate::client::Position;
-
-#[derive(Copy, Clone, Debug, Eq, PartialEq)]
-pub struct Point<T> {
-    pub x: T,
-    pub y: T,
-}
-
-impl<T: Sub<Output = T>> Sub for Point<T> {
-    type Output = Self;
-    fn sub(self, rhs: Self) -> Self::Output {
-        let x: T = self.x - rhs.x;
-        let y: T = self.y - rhs.y;
-        Self { x, y }
-    }
-}
-
-impl<T: Copy + Eq + Ord + Sub<Output = T> + Mul<Output = T> + Add<Output = T>> Point<T> {
-
-    pub fn display_in_bounds<'a>(&self, displays: &'a[Display<T>]) -> Option<&'a Display<T>> {
-        displays.iter().find(|&d| self.in_display_bounds(d))
-    }
-
-    pub fn in_display_bounds(&self, display: &Display<T>) -> bool {
-        self.clamp_to_display(display) == *self
-    }
-
-    pub fn clamp_to_display(&self, display: &Display<T>) -> Self {
-        let x = self.x.clamp(display.left, display.right);
-        let y = self.y.clamp(display.top, display.bottom);
-        Self { x, y }
-    }
-
-    /// Calculates the direction of maximum change between this point and the point given by other
-    ///
-    /// # Arguments
-    ///
-    /// * `other`: the point to calculate the distance
-    ///
-    /// returns: Position -> The direction in which the distance is largest
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// use lan_mouse::client::Position;
-    /// use lan_mouse::display_util::Point;
-    /// let a = Point { x: 0, y: 0 };
-    /// let b = Point { x: 1, y: 2 };
-    /// assert_eq!(a.direction_of_maximum_change(b), Position::Bottom)
-    /// ```
-    ///
-    /// ```
-    /// use lan_mouse::client::Position;
-    /// use lan_mouse::display_util::Point;
-    /// let a = Point { x: 0, y: 0 };
-    /// let b = Point { x: 1, y: -2 };
-    /// assert_eq!(a.direction_of_maximum_change(b), Position::Top)
-    /// ```
-    /// ```
-    /// use lan_mouse::client::Position;
-    /// use lan_mouse::display_util::Point;
-    /// let a = Point { x: 0, y: 0 };
-    /// let b = Point { x: -2, y: -1 };
-    /// assert_eq!(a.direction_of_maximum_change(b), Position::Left)
-    /// ```
-    /// ```
-    /// use lan_mouse::client::Position;
-    /// use lan_mouse::display_util::Point;
-    /// let a = Point { x: 0, y: 0 };
-    /// let b = Point { x: 2, y: -1 };
-    /// assert_eq!(a.direction_of_maximum_change(b), Position::Right)
-    /// ```
-    pub fn direction_of_maximum_change(self, other: Self) -> Position {
-        let distances = [
-            (Position::Left, self.x - other.x),
-            (Position::Right, other.x - self.x),
-            (Position::Top, self.y - other.y),
-            (Position::Bottom, other.y - self.y),
-        ];
-        distances.into_iter().max_by_key(|(_, d)| *d).map(|(p, _)| p).expect("no position")
-    }
-}
-
-#[derive(Copy, Clone, Debug, Eq, PartialEq)]
-pub struct Display<T> {
-    pub left: T,
-    pub right: T,
-    pub top: T,
-    pub bottom: T,
-}
-
-#[derive(Clone, Copy)]
-pub struct DirectedLine<T> {
-    pub start: Point<T>,
-    pub end: Point<T>,
-}
-
-impl<T: Copy + Eq + Ord + Sub<Output = T> + Mul<Output = T> + Add<Output = T>> DirectedLine<T> {
-    pub fn crossed_display_bounds<'a>(&self, displays: &'a [Display<T>]) -> Option<(&'a Display<T>, Position)> {
-        // was in bounds
-        let Some(display) = self.start.display_in_bounds(displays) else {
-            return None;
-        };
-        // still in bounds
-        if self.end.display_in_bounds(displays).is_some() {
-            return None;
-        }
-        // was in bounds of `display`, now out of bounds
-        let clamped = self.end.clamp_to_display(&display);
-        let dir = clamped.direction_of_maximum_change(self.end);
-        Some((display, dir))
-    }
-}

src/frontend.rs

@@ -107,16 +107,18 @@ pub enum FrontendRequest {
     UpdatePosition(ClientHandle, Position),
     /// update fix-ips
     UpdateFixIps(ClientHandle, Vec<IpAddr>),
+    /// request the state of the given client
+    GetState(ClientHandle),
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub enum FrontendEvent {
     /// a client was created
     Created(ClientHandle, ClientConfig, ClientState),
-    /// a client was updated
+    /// no such client
-    Updated(ClientHandle, ClientConfig),
+    NoSuchClient(ClientHandle),
     /// state changed
-    StateChange(ClientHandle, ClientState),
+    State(ClientHandle, ClientConfig, ClientState),
     /// the client was deleted
     Deleted(ClientHandle),
     /// new port, reason of failure (if failed)
@@ -235,9 +237,7 @@ impl FrontendListener {
         let json = serde_json::to_string(&notify).unwrap();
         let payload = json.as_bytes();
         let len = payload.len().to_be_bytes();
-        log::debug!("json: {json}, len: {}", payload.len());
+        log::debug!("broadcasting event to streams: {json}");
-
-        log::debug!("broadcasting event to streams: {:?}", self.tx_streams);
         let mut keep = vec![];
         // TODO do simultaneously
         for tx in self.tx_streams.iter_mut() {

src/frontend/cli.rs

@@ -100,6 +100,18 @@ impl<'a> Cli<'a> {
         }
     }
 
+    async fn update_client(&mut self, handle: ClientHandle) -> Result<()> {
+        self.send_request(FrontendRequest::GetState(handle)).await?;
+        loop {
+            let event = self.await_event().await?;
+            self.handle_event(event.clone());
+            if let FrontendEvent::State(_, _, _) | FrontendEvent::NoSuchClient(_) = event {
+                break;
+            }
+        }
+        Ok(())
+    }
+
     async fn execute(&mut self, cmd: Command) -> Result<()> {
         match cmd {
             Command::None => {}
@@ -125,14 +137,8 @@ impl<'a> Cli<'a> {
                     FrontendRequest::UpdatePosition(handle, pos),
                 ] {
                     self.send_request(request).await?;
-                    loop {
-                        let event = self.await_event().await?;
-                        self.handle_event(event.clone());
-                        if let FrontendEvent::Updated(_, _) = event {
-                            break;
-                        }
-                    }
                 }
+                self.update_client(handle).await?;
             }
             Command::Disconnect(id) => {
                 self.send_request(FrontendRequest::Delete(id)).await?;
@@ -148,26 +154,12 @@ impl<'a> Cli<'a> {
             Command::Activate(id) => {
                 self.send_request(FrontendRequest::Activate(id, true))
                     .await?;
-                loop {
+                self.update_client(id).await?;
-                    let event = self.await_event().await?;
-                    self.handle_event(event.clone());
-                    if let FrontendEvent::StateChange(_, _) = event {
-                        self.handle_event(event);
-                        break;
-                    }
-                }
             }
             Command::Deactivate(id) => {
                 self.send_request(FrontendRequest::Activate(id, false))
                     .await?;
-                loop {
+                self.update_client(id).await?;
-                    let event = self.await_event().await?;
-                    self.handle_event(event.clone());
-                    if let FrontendEvent::StateChange(_, _) = event {
-                        self.handle_event(event);
-                        break;
-                    }
-                }
             }
             Command::List => {
                 self.send_request(FrontendRequest::Enumerate()).await?;
@@ -182,25 +174,12 @@ impl<'a> Cli<'a> {
             Command::SetHost(handle, host) => {
                 let request = FrontendRequest::UpdateHostname(handle, Some(host.clone()));
                 self.send_request(request).await?;
-                loop {
+                self.update_client(handle).await?;
-                    let event = self.await_event().await?;
-                    self.handle_event(event.clone());
-                    if let FrontendEvent::Updated(_, _) = event {
-                        self.handle_event(event);
-                        break;
-                    }
-                }
             }
             Command::SetPort(handle, port) => {
                 let request = FrontendRequest::UpdatePort(handle, port.unwrap_or(DEFAULT_PORT));
                 self.send_request(request).await?;
-                loop {
+                self.update_client(handle).await?;
-                    let event = self.await_event().await?;
-                    self.handle_event(event.clone());
-                    if let FrontendEvent::Updated(_, _) = event {
-                        break;
-                    }
-                }
             }
             Command::Help => {
                 for cmd_type in [
@@ -244,8 +223,11 @@ impl<'a> Cli<'a> {
                 eprintln!();
                 self.clients.push((h, c, s));
             }
-            FrontendEvent::Updated(h, c) => {
+            FrontendEvent::NoSuchClient(h) => {
-                if let Some((_, config, _)) = self.find_mut(h) {
+                eprintln!("no such client: {h}");
+            }
+            FrontendEvent::State(h, c, s) => {
+                if let Some((_, config, state)) = self.find_mut(h) {
                     let old_host = config.hostname.clone().unwrap_or("\"\"".into());
                     let new_host = c.hostname.clone().unwrap_or("\"\"".into());
                     if old_host != new_host {
@@ -261,10 +243,6 @@ impl<'a> Cli<'a> {
                         eprintln!("client {h} ips updated: {:?}", c.fix_ips)
                     }
                     *config = c;
-                }
-            }
-            FrontendEvent::StateChange(h, s) => {
-                if let Some((_, _, state)) = self.find_mut(h) {
                     if state.active ^ s.active {
                         eprintln!(
                             "client {h} {}",

src/frontend/gtk.rs

@@ -126,12 +126,11 @@ fn build_ui(app: &Application) {
                 FrontendEvent::Deleted(client) => {
                     window.delete_client(client);
                 }
-                FrontendEvent::Updated(handle, client) => {
+                FrontendEvent::State(handle, config, state) => {
-                    window.update_client_config(handle, client);
+                    window.update_client_config(handle, config);
-                }
-                FrontendEvent::StateChange(handle, state) => {
                     window.update_client_state(handle, state);
                 }
+                FrontendEvent::NoSuchClient(_) => { }
                 FrontendEvent::Error(e) => {
                     window.show_toast(e.as_str());
                 },

src/frontend/gtk/window.rs

@@ -51,6 +51,10 @@ impl Window {
             .expect("Could not get clients")
     }
 
+    fn client_by_idx(&self, idx: u32) -> Option<ClientObject> {
+        self.clients().item(idx).map(|o| o.downcast().unwrap())
+    }
+
     fn setup_clients(&self) {
         let model = gio::ListStore::new::<ClientObject>();
         self.imp().clients.replace(Some(model));
@@ -62,27 +66,24 @@ impl Window {
                 let client_object = obj.downcast_ref().expect("Expected object of type `ClientObject`.");
                 let row = window.create_client_row(client_object);
                 row.connect_closure("request-update", false, closure_local!(@strong window => move |row: ClientRow, active: bool| {
-                    let index = row.index() as u32;
+                    if let Some(client) = window.client_by_idx(row.index() as u32) {
-                    let Some(client) = window.clients().item(index) else {
+                        window.request_client_activate(&client, active);
-                        return;
+                        window.request_client_update(&client);
-                    };
+                        window.request_client_state(&client);
-                    let client = client.downcast_ref::<ClientObject>().unwrap();
+                    }
-                    window.request_client_update(client);
-                    window.request_client_activate(client, active)
                 }));
                 row.connect_closure("request-delete", false, closure_local!(@strong window => move |row: ClientRow| {
-                    let index = row.index() as u32;
+                    if let Some(client) = window.client_by_idx(row.index() as u32) {
-                    window.request_client_delete(index);
+                        window.request_client_delete(&client);
+                    }
                 }));
                 row.connect_closure("request-dns", false, closure_local!(@strong window => move
                 |row: ClientRow| {
-                    let index = row.index() as u32;
+                    if let Some(client) = window.client_by_idx(row.index() as u32) {
-                    let Some(client) = window.clients().item(index) else {
+                        window.request_client_update(&client);
-                        return;
+                        window.request_dns(&client);
-                    };
+                        window.request_client_state(&client);
-                    let client = client.downcast_ref::<ClientObject>().unwrap();
+                    }
-                    window.request_client_update(client);
-                    window.request_dns(index);
                 }));
                 row.upcast()
             })
@@ -177,7 +178,7 @@ impl Window {
 
         if state.resolving != data.resolving {
             client_object.set_resolving(state.resolving);
-            log::debug!("resolving {}: {}", data.handle, state.active);
+            log::debug!("resolving {}: {}", data.handle, state.resolving);
         }
 
         self.update_dns_state(handle, !state.ips.is_empty());
@@ -204,20 +205,6 @@ impl Window {
         }
     }
 
-    pub fn request_dns(&self, idx: u32) {
-        let client_object = self.clients().item(idx).unwrap();
-        let client_object: &ClientObject = client_object.downcast_ref().unwrap();
-        let data = client_object.get_data();
-        let event = FrontendRequest::ResolveDns(data.handle);
-        self.request(event);
-    }
-
-    pub fn request_client_create(&self) {
-        let event = FrontendRequest::Create;
-        self.imp().set_port(DEFAULT_PORT);
-        self.request(event);
-    }
-
     pub fn request_port_change(&self) {
         let port = self.imp().port_entry.get().text().to_string();
         if let Ok(port) = port.as_str().parse::<u16>() {
@@ -227,6 +214,23 @@ impl Window {
         }
     }
 
+    pub fn request_client_state(&self, client: &ClientObject) {
+        let handle = client.handle();
+        let event = FrontendRequest::GetState(handle);
+        self.request(event);
+    }
+
+    pub fn request_client_create(&self) {
+        let event = FrontendRequest::Create;
+        self.request(event);
+    }
+
+    pub fn request_dns(&self, client: &ClientObject) {
+        let data = client.get_data();
+        let event = FrontendRequest::ResolveDns(data.handle);
+        self.request(event);
+    }
+
     pub fn request_client_update(&self, client: &ClientObject) {
         let handle = client.handle();
         let data = client.get_data();
@@ -239,33 +243,25 @@ impl Window {
             FrontendRequest::UpdatePosition(handle, position),
             FrontendRequest::UpdatePort(handle, port),
         ] {
-            log::debug!("requesting: {event:?}");
             self.request(event);
         }
     }
 
     pub fn request_client_activate(&self, client: &ClientObject, active: bool) {
         let handle = client.handle();
-
         let event = FrontendRequest::Activate(handle, active);
-        log::debug!("requesting: {event:?}");
         self.request(event);
     }
 
-    pub fn request_client_delete(&self, idx: u32) {
+    pub fn request_client_delete(&self, client: &ClientObject) {
-        if let Some(obj) = self.clients().item(idx) {
+        let handle = client.handle();
-            let client_object: &ClientObject = obj
+        let event = FrontendRequest::Delete(handle);
-                .downcast_ref()
+        self.request(event);
-                .expect("Expected object of type `ClientObject`.");
-            let handle = client_object.handle();
-            let event = FrontendRequest::Delete(handle);
-            self.request(event);
-        }
     }
 
     pub fn request(&self, event: FrontendRequest) {
         let json = serde_json::to_string(&event).unwrap();
-        log::debug!("requesting {json}");
+        log::debug!("requesting: {json}");
         let mut stream = self.imp().stream.borrow_mut();
         let stream = stream.as_mut().unwrap();
         let bytes = json.as_bytes();

src/lib.rs

@@ -11,4 +11,3 @@ pub mod capture_test;
 pub mod emulation_test;
 pub mod frontend;
 pub mod scancode;
-pub mod display_util;

src/server.rs

@@ -55,6 +55,7 @@ impl Server {
                 fix_ips: config_client.ips.into_iter().collect(),
                 port: config_client.port,
                 pos: config_client.pos,
+                cmd: config_client.enter_hook,
             };
             let state = ClientState {
                 active: config_client.active,

src/server/capture_task.rs

@@ -2,7 +2,7 @@ use anyhow::{anyhow, Result};
 use futures::StreamExt;
 use std::{collections::HashSet, net::SocketAddr};
 
-use tokio::{sync::mpsc::Sender, task::JoinHandle};
+use tokio::{process::Command, sync::mpsc::Sender, task::JoinHandle};
 
 use crate::{
     capture::{self, InputCapture},
@@ -140,6 +140,9 @@ async fn handle_capture_event(
     if start_timer {
         let _ = timer_tx.try_send(());
     }
+    if enter {
+        spawn_hook_command(server, handle);
+    }
     if let Some(addr) = addr {
         if enter {
             let _ = sender_tx.send((Event::Enter(), addr)).await;
@@ -148,3 +151,34 @@ async fn handle_capture_event(
     }
     Ok(())
 }
+
+fn spawn_hook_command(server: &Server, handle: ClientHandle) {
+    let Some(cmd) = server
+        .client_manager
+        .borrow()
+        .get(handle)
+        .and_then(|(c, _)| c.cmd.clone())
+    else {
+        return;
+    };
+    tokio::task::spawn_local(async move {
+        log::info!("spawning command!");
+        let mut child = match Command::new("sh").arg("-c").arg(cmd.as_str()).spawn() {
+            Ok(c) => c,
+            Err(e) => {
+                log::warn!("could not execute cmd: {e}");
+                return;
+            }
+        };
+        match child.wait().await {
+            Ok(s) => {
+                if s.success() {
+                    log::info!("{cmd} exited successfully");
+                } else {
+                    log::warn!("{cmd} exited with {s}");
+                }
+            }
+            Err(e) => log::warn!("{cmd}: {e}"),
+        }
+    });
+}

src/server/frontend_task.rs

@@ -111,16 +111,17 @@ async fn handle_frontend_event(
         }
         FrontendRequest::Activate(handle, active) => {
             if active {
-                activate_client(server, frontend, capture, emulate, handle).await;
+                activate_client(server, capture, emulate, handle).await;
             } else {
-                deactivate_client(server, frontend, capture, emulate, handle).await;
+                deactivate_client(server, capture, emulate, handle).await;
             }
         }
         FrontendRequest::ChangePort(port) => {
             let _ = port_tx.send(port).await;
         }
         FrontendRequest::Delete(handle) => {
-            remove_client(server, frontend, capture, emulate, handle).await;
+            remove_client(server, capture, emulate, handle).await;
+            broadcast(frontend, FrontendEvent::Deleted(handle)).await;
         }
         FrontendRequest::Enumerate() => {
             let clients = server
@@ -131,25 +132,24 @@ async fn handle_frontend_event(
                 .collect();
             broadcast(frontend, FrontendEvent::Enumerate(clients)).await;
         }
+        FrontendRequest::GetState(handle) => {
+            broadcast_client(server, frontend, handle).await;
+        }
         FrontendRequest::Terminate() => {
             log::info!("terminating gracefully...");
             return true;
         }
         FrontendRequest::UpdateFixIps(handle, fix_ips) => {
             update_fix_ips(server, resolve_tx, handle, fix_ips).await;
-            broadcast_client_update(server, frontend, handle).await;
         }
         FrontendRequest::UpdateHostname(handle, hostname) => {
             update_hostname(server, resolve_tx, handle, hostname).await;
-            broadcast_client_update(server, frontend, handle).await;
         }
         FrontendRequest::UpdatePort(handle, port) => {
             update_port(server, handle, port).await;
-            broadcast_client_update(server, frontend, handle).await;
         }
         FrontendRequest::UpdatePosition(handle, pos) => {
             update_pos(server, handle, capture, emulate, pos).await;
-            broadcast_client_update(server, frontend, handle).await;
         }
         FrontendRequest::ResolveDns(handle) => {
             let hostname = server
@@ -181,15 +181,13 @@ pub async fn add_client(server: &Server, frontend: &mut FrontendListener) {
 
 pub async fn deactivate_client(
     server: &Server,
-    frontend: &mut FrontendListener,
     capture: &Sender<CaptureEvent>,
     emulate: &Sender<EmulationEvent>,
     handle: ClientHandle,
 ) {
-    let state = match server.client_manager.borrow_mut().get_mut(handle) {
+    match server.client_manager.borrow_mut().get_mut(handle) {
         Some((_, s)) => {
             s.active = false;
-            s.clone()
         }
         None => return,
     };
@@ -197,13 +195,10 @@ pub async fn deactivate_client(
     let event = ClientEvent::Destroy(handle);
     let _ = capture.send(CaptureEvent::ClientEvent(event)).await;
     let _ = emulate.send(EmulationEvent::ClientEvent(event)).await;
-    let event = FrontendEvent::StateChange(handle, state);
-    broadcast(frontend, event).await;
 }
 
 pub async fn activate_client(
     server: &Server,
-    frontend: &mut FrontendListener,
     capture: &Sender<CaptureEvent>,
     emulate: &Sender<EmulationEvent>,
     handle: ClientHandle,
@@ -217,14 +212,13 @@ pub async fn activate_client(
     let other = server.client_manager.borrow_mut().find_client(pos);
     if let Some(other) = other {
         if other != handle {
-            deactivate_client(server, frontend, capture, emulate, other).await;
+            deactivate_client(server, capture, emulate, other).await;
         }
     }
 
     /* activate the client */
-    let state = if let Some((_, s)) = server.client_manager.borrow_mut().get_mut(handle) {
+    if let Some((_, s)) = server.client_manager.borrow_mut().get_mut(handle) {
         s.active = true;
-        s.clone()
     } else {
         return;
     };
@@ -233,13 +227,10 @@ pub async fn activate_client(
     let event = ClientEvent::Create(handle, pos);
     let _ = capture.send(CaptureEvent::ClientEvent(event)).await;
     let _ = emulate.send(EmulationEvent::ClientEvent(event)).await;
-    let event = FrontendEvent::StateChange(handle, state);
-    broadcast(frontend, event).await;
 }
 
 pub async fn remove_client(
     server: &Server,
-    frontend: &mut FrontendListener,
     capture: &Sender<CaptureEvent>,
     emulate: &Sender<EmulationEvent>,
     handle: ClientHandle,
@@ -258,9 +249,6 @@ pub async fn remove_client(
         let _ = capture.send(CaptureEvent::ClientEvent(destroy)).await;
         let _ = emulate.send(EmulationEvent::ClientEvent(destroy)).await;
     }
-
-    let event = FrontendEvent::Deleted(handle);
-    broadcast(frontend, event).await;
 }
 
 async fn update_fix_ips(
@@ -356,11 +344,11 @@ async fn update_pos(
     }
 }
 
-async fn broadcast_client_update(
+async fn broadcast_client(server: &Server, frontend: &mut FrontendListener, handle: ClientHandle) {
-    server: &Server,
+    let client = server.client_manager.borrow().get(handle).cloned();
-    frontend: &mut FrontendListener,
+    if let Some((config, state)) = client {
-    handle: ClientHandle,
+        broadcast(frontend, FrontendEvent::State(handle, config, state)).await;
-) {
+    } else {
-    let (client, _) = server.client_manager.borrow().get(handle).unwrap().clone();
+        broadcast(frontend, FrontendEvent::NoSuchClient(handle)).await;
-    broadcast(frontend, FrontendEvent::Updated(handle, client)).await;
+    }
 }

src/server/resolver_task.rs

@@ -35,7 +35,7 @@ pub fn new(
                 Ok(ips) => ips,
                 Err(e) => {
                     log::warn!("could not resolve host '{host}': {e}");
-                    continue;
+                    vec![]
                 }
             };
 
@@ -59,14 +59,10 @@ async fn notify_state_change(
     server: &mut Server,
     handle: ClientHandle,
 ) {
-    let state = server
+    let state = server.client_manager.borrow_mut().get_mut(handle).cloned();
-        .client_manager
+    if let Some((config, state)) = state {
-        .borrow_mut()
-        .get_mut(handle)
-        .map(|(_, s)| s.clone());
-    if let Some(state) = state {
         let _ = frontend
-            .send(FrontendEvent::StateChange(handle, state))
+            .send(FrontendEvent::State(handle, config, state))
             .await;
     }
 }