rename {Capture,Emulation}Event to %Request

move pressed key tracking to input capture

Cargo.lock

@@ -1306,7 +1306,7 @@ dependencies = [
 
 [[package]]
 name = "lan-mouse"
-version = "0.9.0"
+version = "0.9.1"
 dependencies = [
  "anyhow",
  "async-channel",

Cargo.toml

@@ -4,7 +4,7 @@ members = ["input-capture", "input-emulation", "input-event"]
 [package]
 name = "lan-mouse"
 description = "Software KVM Switch / mouse & keyboard sharing software for Local Area Networks"
-version = "0.9.0"
+version = "0.9.1"
 edition = "2021"
 license = "GPL-3.0-or-later"
 repository = "https://github.com/feschber/lan-mouse"

input-capture/src/dummy.rs

@@ -8,7 +8,7 @@ use input_event::Event;
 
 use crate::CaptureError;
 
-use super::{CaptureHandle, InputCapture, Position};
+use super::{Capture, CaptureHandle, Position};
 
 pub struct DummyInputCapture {}
 
@@ -25,7 +25,7 @@ impl Default for DummyInputCapture {
 }
 
 #[async_trait]
-impl InputCapture for DummyInputCapture {
+impl Capture for DummyInputCapture {
     async fn create(&mut self, _handle: CaptureHandle, _pos: Position) -> Result<(), CaptureError> {
         Ok(())
     }

input-capture/src/lib.rs

@@ -1,31 +1,32 @@
-use std::fmt::Display;
+use std::{collections::HashSet, fmt::Display, task::Poll};
 
 use async_trait::async_trait;
+use futures::StreamExt;
 use futures_core::Stream;
 
-use input_event::Event;
+use input_event::{scancode, Event, KeyboardEvent};
 
 pub use error::{CaptureCreationError, CaptureError, InputCaptureError};
 
 pub mod error;
 
 #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
-pub mod libei;
+mod libei;
 
 #[cfg(target_os = "macos")]
-pub mod macos;
+mod macos;
 
 #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
-pub mod wayland;
+mod wayland;
 
 #[cfg(windows)]
-pub mod windows;
+mod windows;
 
 #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
-pub mod x11;
+mod x11;
 
 /// fallback input capture (does not produce events)
-pub mod dummy;
+mod dummy;
 
 pub type CaptureHandle = u64;
 
@@ -93,10 +94,79 @@ impl Display for Backend {
     }
 }
 
+pub struct InputCapture {
+    capture: Box<dyn Capture>,
+    pressed_keys: HashSet<scancode::Linux>,
+}
+
+impl InputCapture {
+    /// create a new client with the given id
+    pub async fn create(&mut self, id: CaptureHandle, pos: Position) -> Result<(), CaptureError> {
+        self.capture.create(id, pos).await
+    }
+
+    /// destroy the client with the given id, if it exists
+    pub async fn destroy(&mut self, id: CaptureHandle) -> Result<(), CaptureError> {
+        self.capture.destroy(id).await
+    }
+
+    /// release mouse
+    pub async fn release(&mut self) -> Result<(), CaptureError> {
+        self.pressed_keys.clear();
+        self.capture.release().await
+    }
+
+    /// destroy the input capture
+    pub async fn terminate(&mut self) -> Result<(), CaptureError> {
+        self.capture.terminate().await
+    }
+
+    /// creates a new [`InputCapture`]
+    pub async fn new(backend: Option<Backend>) -> Result<Self, CaptureCreationError> {
+        let capture = create(backend).await?;
+        Ok(Self {
+            capture,
+            pressed_keys: HashSet::new(),
+        })
+    }
+
+    /// check whether the given keys are pressed
+    pub fn keys_pressed(&self, keys: &[scancode::Linux]) -> bool {
+        keys.iter().all(|k| self.pressed_keys.contains(k))
+    }
+
+    fn update_pressed_keys(&mut self, key: u32, state: u8) {
+        if let Ok(scancode) = scancode::Linux::try_from(key) {
+            log::debug!("key: {key}, state: {state}, scancode: {scancode:?}");
+            match state {
+                1 => self.pressed_keys.insert(scancode),
+                _ => self.pressed_keys.remove(&scancode),
+            };
+        }
+    }
+}
+
+impl Stream for InputCapture {
+    type Item = Result<(CaptureHandle, Event), CaptureError>;
+
+    fn poll_next(
+        mut self: std::pin::Pin<&mut Self>,
+        cx: &mut std::task::Context<'_>,
+    ) -> Poll<Option<Self::Item>> {
+        match self.capture.poll_next_unpin(cx) {
+            Poll::Ready(e) => {
+                if let Some(Ok((_, Event::Keyboard(KeyboardEvent::Key { key, state, .. })))) = e {
+                    self.update_pressed_keys(key, state);
+                }
+                Poll::Ready(e)
+            }
+            Poll::Pending => Poll::Pending,
+        }
+    }
+}
+
 #[async_trait]
-pub trait InputCapture:
+trait Capture: Stream<Item = Result<(CaptureHandle, Event), CaptureError>> + Unpin {
-    Stream<Item = Result<(CaptureHandle, Event), CaptureError>> + Unpin
-{
     /// create a new client with the given id
     async fn create(&mut self, id: CaptureHandle, pos: Position) -> Result<(), CaptureError>;
 
@@ -110,10 +180,10 @@ pub trait InputCapture:
     async fn terminate(&mut self) -> Result<(), CaptureError>;
 }
 
-pub async fn create_backend(
+async fn create_backend(
     backend: Backend,
 ) -> Result<
-    Box<dyn InputCapture<Item = Result<(CaptureHandle, Event), CaptureError>>>,
+    Box<dyn Capture<Item = Result<(CaptureHandle, Event), CaptureError>>>,
     CaptureCreationError,
 > {
     match backend {
@@ -131,10 +201,10 @@ pub async fn create_backend(
     }
 }
 
-pub async fn create(
+async fn create(
     backend: Option<Backend>,
 ) -> Result<
-    Box<dyn InputCapture<Item = Result<(CaptureHandle, Event), CaptureError>>>,
+    Box<dyn Capture<Item = Result<(CaptureHandle, Event), CaptureError>>>,
     CaptureCreationError,
 > {
     if let Some(backend) = backend {

input-capture/src/libei.rs

@@ -38,7 +38,7 @@ use input_event::Event;
 
 use super::{
     error::{CaptureError, LibeiCaptureCreationError, ReisConvertEventStreamError},
-    CaptureHandle, InputCapture as LanMouseInputCapture, Position,
+    Capture as LanMouseInputCapture, CaptureHandle, Position,
 };
 
 /* there is a bug in xdg-remote-desktop-portal-gnome / mutter that

input-capture/src/macos.rs

@@ -1,5 +1,5 @@
 use crate::{
-    error::MacOSInputCaptureCreationError, CaptureError, CaptureHandle, InputCapture, Position,
+    error::MacOSInputCaptureCreationError, Capture, CaptureError, CaptureHandle, Position,
 };
 use async_trait::async_trait;
 use futures_core::Stream;
@@ -24,7 +24,7 @@ impl Stream for MacOSInputCapture {
 }
 
 #[async_trait]
-impl InputCapture for MacOSInputCapture {
+impl Capture for MacOSInputCapture {
     async fn create(&mut self, _id: CaptureHandle, _pos: Position) -> Result<(), CaptureError> {
         Ok(())
     }

input-capture/src/wayland.rs

@@ -1,11 +1,10 @@
 use async_trait::async_trait;
 use futures_core::Stream;
-use memmap::MmapOptions;
 use std::{
     collections::VecDeque,
     env,
     io::{self, ErrorKind},
-    os::fd::{AsFd, OwnedFd, RawFd},
+    os::fd::{AsFd, RawFd},
     pin::Pin,
     task::{ready, Context, Poll},
 };
@@ -14,7 +13,7 @@ use tokio::io::unix::AsyncFd;
 use std::{
     fs::File,
     io::{BufWriter, Write},
-    os::unix::prelude::{AsRawFd, FromRawFd},
+    os::unix::prelude::AsRawFd,
     sync::Arc,
 };
 
@@ -59,15 +58,13 @@ use wayland_client::{
     Connection, Dispatch, DispatchError, EventQueue, QueueHandle, WEnum,
 };
 
-use tempfile;
-
 use input_event::{Event, KeyboardEvent, PointerEvent};
 
 use crate::CaptureError;
 
 use super::{
     error::{LayerShellCaptureCreationError, WaylandBindError},
-    CaptureHandle, InputCapture, Position,
+    Capture, CaptureHandle, Position,
 };
 
 struct Globals {
@@ -108,7 +105,7 @@ struct State {
     client_for_window: Vec<(Arc<Window>, CaptureHandle)>,
     focused: Option<(Arc<Window>, CaptureHandle)>,
     g: Globals,
-    wayland_fd: OwnedFd,
+    wayland_fd: RawFd,
     read_guard: Option<ReadEventsGuard>,
     qh: QueueHandle<Self>,
     pending_events: VecDeque<(CaptureHandle, Event)>,
@@ -123,7 +120,7 @@ struct Inner {
 
 impl AsRawFd for Inner {
     fn as_raw_fd(&self) -> RawFd {
-        self.state.wayland_fd.as_raw_fd()
+        self.state.wayland_fd
     }
 }
 
@@ -308,10 +305,7 @@ impl WaylandInputCapture {
         // flush outgoing events
         queue.flush()?;
 
-        // prepare reading wayland events
+        let wayland_fd = queue.as_fd().as_raw_fd();
-        let read_guard = queue.prepare_read().unwrap(); // there can not yet be events to dispatch
-        let wayland_fd = read_guard.connection_fd().try_clone_to_owned().unwrap();
-        std::mem::drop(read_guard);
 
         let mut state = State {
             pointer: None,
@@ -565,7 +559,7 @@ impl Inner {
 }
 
 #[async_trait]
-impl InputCapture for WaylandInputCapture {
+impl Capture for WaylandInputCapture {
     async fn create(&mut self, handle: CaptureHandle, pos: Position) -> Result<(), CaptureError> {
         self.add_client(handle, pos);
         let inner = self.0.get_mut();
@@ -820,15 +814,6 @@ impl Dispatch<WlKeyboard, ()> for State {
                     ));
                 }
             }
-            wl_keyboard::Event::Keymap {
-                format: _,
-                fd,
-                size: _,
-            } => {
-                let fd = unsafe { &File::from_raw_fd(fd.as_raw_fd()) };
-                let _mmap = unsafe { MmapOptions::new().map_copy(fd).unwrap() };
-                // TODO keymap
-            }
             _ => (),
         }
     }

input-capture/src/windows.rs

@@ -37,7 +37,7 @@ use input_event::{
     Event, KeyboardEvent, PointerEvent, BTN_BACK, BTN_FORWARD, BTN_LEFT, BTN_MIDDLE, BTN_RIGHT,
 };
 
-use super::{CaptureError, CaptureHandle, InputCapture, Position};
+use super::{Capture, CaptureError, CaptureHandle, Position};
 
 enum Request {
     Create(CaptureHandle, Position),
@@ -64,7 +64,7 @@ unsafe fn signal_message_thread(event_type: EventType) {
 }
 
 #[async_trait]
-impl InputCapture for WindowsInputCapture {
+impl Capture for WindowsInputCapture {
     async fn create(&mut self, handle: CaptureHandle, pos: Position) -> Result<(), CaptureError> {
         unsafe {
             {

input-capture/src/x11.rs

@@ -5,7 +5,7 @@ use futures_core::Stream;
 
 use crate::CaptureError;
 
-use super::InputCapture;
+use super::Capture;
 use input_event::Event;
 
 use super::error::X11InputCaptureCreationError;
@@ -20,7 +20,7 @@ impl X11InputCapture {
 }
 
 #[async_trait]
-impl InputCapture for X11InputCapture {
+impl Capture for X11InputCapture {
     async fn create(&mut self, _id: CaptureHandle, _pos: Position) -> Result<(), CaptureError> {
         Ok(())
     }

input-emulation/src/dummy.rs

@@ -3,19 +3,19 @@ use input_event::Event;
 
 use crate::error::EmulationError;
 
-use super::{EmulationHandle, InputEmulation};
+use super::{Emulation, EmulationHandle};
 
 #[derive(Default)]
-pub struct DummyEmulation;
+pub(crate) struct DummyEmulation;
 
 impl DummyEmulation {
-    pub fn new() -> Self {
+    pub(crate) fn new() -> Self {
         Self {}
     }
 }
 
 #[async_trait]
-impl InputEmulation for DummyEmulation {
+impl Emulation for DummyEmulation {
     async fn consume(
         &mut self,
         event: Event,

input-emulation/src/lib.rs

@@ -1,31 +1,34 @@
 use async_trait::async_trait;
-use std::fmt::Display;
+use std::{
+    collections::{HashMap, HashSet},
+    fmt::Display,
+};
 
-use input_event::Event;
+use input_event::{Event, KeyboardEvent};
 
 pub use self::error::{EmulationCreationError, EmulationError, InputEmulationError};
 
 #[cfg(windows)]
-pub mod windows;
+mod windows;
 
 #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
-pub mod x11;
+mod x11;
 
 #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
-pub mod wlroots;
+mod wlroots;
 
 #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
-pub mod xdg_desktop_portal;
+mod xdg_desktop_portal;
 
 #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
-pub mod libei;
+mod libei;
 
 #[cfg(target_os = "macos")]
-pub mod macos;
+mod macos;
 
 /// fallback input emulation (logs events)
-pub mod dummy;
+mod dummy;
-pub mod error;
+mod error;
 
 pub type EmulationHandle = u64;
 
@@ -66,8 +69,166 @@ impl Display for Backend {
     }
 }
 
+pub struct InputEmulation {
+    emulation: Box<dyn Emulation>,
+    handles: HashSet<EmulationHandle>,
+    pressed_keys: HashMap<EmulationHandle, HashSet<u32>>,
+}
+
+impl InputEmulation {
+    async fn with_backend(backend: Backend) -> Result<InputEmulation, EmulationCreationError> {
+        let emulation: Box<dyn Emulation> = match backend {
+            #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+            Backend::Wlroots => Box::new(wlroots::WlrootsEmulation::new()?),
+            #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+            Backend::Libei => Box::new(libei::LibeiEmulation::new().await?),
+            #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+            Backend::X11 => Box::new(x11::X11Emulation::new()?),
+            #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+            Backend::Xdp => Box::new(xdg_desktop_portal::DesktopPortalEmulation::new().await?),
+            #[cfg(windows)]
+            Backend::Windows => Box::new(windows::WindowsEmulation::new()?),
+            #[cfg(target_os = "macos")]
+            Backend::MacOs => Box::new(macos::MacOSEmulation::new()?),
+            Backend::Dummy => Box::new(dummy::DummyEmulation::new()),
+        };
+        Ok(Self {
+            emulation,
+            handles: HashSet::new(),
+            pressed_keys: HashMap::new(),
+        })
+    }
+
+    pub async fn new(backend: Option<Backend>) -> Result<InputEmulation, EmulationCreationError> {
+        if let Some(backend) = backend {
+            let b = Self::with_backend(backend).await;
+            if b.is_ok() {
+                log::info!("using emulation backend: {backend}");
+            }
+            return b;
+        }
+
+        for backend in [
+            #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+            Backend::Wlroots,
+            #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+            Backend::Libei,
+            #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+            Backend::Xdp,
+            #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+            Backend::X11,
+            #[cfg(windows)]
+            Backend::Windows,
+            #[cfg(target_os = "macos")]
+            Backend::MacOs,
+            Backend::Dummy,
+        ] {
+            match Self::with_backend(backend).await {
+                Ok(b) => {
+                    log::info!("using emulation backend: {backend}");
+                    return Ok(b);
+                }
+                Err(e) if e.cancelled_by_user() => return Err(e),
+                Err(e) => log::warn!("{e}"),
+            }
+        }
+
+        Err(EmulationCreationError::NoAvailableBackend)
+    }
+
+    pub async fn consume(
+        &mut self,
+        event: Event,
+        handle: EmulationHandle,
+    ) -> Result<(), EmulationError> {
+        match event {
+            Event::Keyboard(KeyboardEvent::Key { key, state, .. }) => {
+                // prevent double pressed / released keys
+                if self.update_pressed_keys(handle, key, state) {
+                    self.emulation.consume(event, handle).await?;
+                }
+                Ok(())
+            }
+            _ => self.emulation.consume(event, handle).await,
+        }
+    }
+
+    pub async fn create(&mut self, handle: EmulationHandle) -> bool {
+        if self.handles.insert(handle) {
+            self.pressed_keys.insert(handle, HashSet::new());
+            self.emulation.create(handle).await;
+            true
+        } else {
+            false
+        }
+    }
+
+    pub async fn destroy(&mut self, handle: EmulationHandle) {
+        let _ = self.release_keys(handle).await;
+        if self.handles.remove(&handle) {
+            self.pressed_keys.remove(&handle);
+            self.emulation.destroy(handle).await
+        }
+    }
+
+    pub async fn terminate(&mut self) {
+        for handle in self.handles.iter().cloned().collect::<Vec<_>>() {
+            self.destroy(handle).await
+        }
+        self.emulation.terminate().await
+    }
+
+    pub async fn release_keys(&mut self, handle: EmulationHandle) -> Result<(), EmulationError> {
+        if let Some(keys) = self.pressed_keys.get_mut(&handle) {
+            let keys = keys.drain().collect::<Vec<_>>();
+            for key in keys {
+                let event = Event::Keyboard(KeyboardEvent::Key {
+                    time: 0,
+                    key,
+                    state: 0,
+                });
+                self.emulation.consume(event, handle).await?;
+                if let Ok(key) = input_event::scancode::Linux::try_from(key) {
+                    log::warn!("releasing stuck key: {key:?}");
+                }
+            }
+        }
+
+        let event = Event::Keyboard(KeyboardEvent::Modifiers {
+            mods_depressed: 0,
+            mods_latched: 0,
+            mods_locked: 0,
+            group: 0,
+        });
+        self.emulation.consume(event, handle).await?;
+        Ok(())
+    }
+
+    pub fn has_pressed_keys(&self, handle: EmulationHandle) -> bool {
+        self.pressed_keys
+            .get(&handle)
+            .is_some_and(|p| !p.is_empty())
+    }
+
+    /// update the pressed_keys for the given handle
+    /// returns whether the event should be processed
+    fn update_pressed_keys(&mut self, handle: EmulationHandle, key: u32, state: u8) -> bool {
+        let Some(pressed_keys) = self.pressed_keys.get_mut(&handle) else {
+            return false;
+        };
+
+        if state == 0 {
+            // currently pressed => can release
+            pressed_keys.remove(&key)
+        } else {
+            // currently not pressed => can press
+            pressed_keys.insert(key)
+        }
+    }
+}
+
 #[async_trait]
-pub trait InputEmulation: Send {
+trait Emulation: Send {
     async fn consume(
         &mut self,
         event: Event,
@@ -77,64 +238,3 @@ pub trait InputEmulation: Send {
     async fn destroy(&mut self, handle: EmulationHandle);
     async fn terminate(&mut self);
 }
-
-pub async fn create_backend(
-    backend: Backend,
-) -> Result<Box<dyn InputEmulation>, EmulationCreationError> {
-    match backend {
-        #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
-        Backend::Wlroots => Ok(Box::new(wlroots::WlrootsEmulation::new()?)),
-        #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
-        Backend::Libei => Ok(Box::new(libei::LibeiEmulation::new().await?)),
-        #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
-        Backend::X11 => Ok(Box::new(x11::X11Emulation::new()?)),
-        #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
-        Backend::Xdp => Ok(Box::new(
-            xdg_desktop_portal::DesktopPortalEmulation::new().await?,
-        )),
-        #[cfg(windows)]
-        Backend::Windows => Ok(Box::new(windows::WindowsEmulation::new()?)),
-        #[cfg(target_os = "macos")]
-        Backend::MacOs => Ok(Box::new(macos::MacOSEmulation::new()?)),
-        Backend::Dummy => Ok(Box::new(dummy::DummyEmulation::new())),
-    }
-}
-
-pub async fn create(
-    backend: Option<Backend>,
-) -> Result<Box<dyn InputEmulation>, EmulationCreationError> {
-    if let Some(backend) = backend {
-        let b = create_backend(backend).await;
-        if b.is_ok() {
-            log::info!("using emulation backend: {backend}");
-        }
-        return b;
-    }
-
-    for backend in [
-        #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
-        Backend::Wlroots,
-        #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
-        Backend::Libei,
-        #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
-        Backend::Xdp,
-        #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
-        Backend::X11,
-        #[cfg(windows)]
-        Backend::Windows,
-        #[cfg(target_os = "macos")]
-        Backend::MacOs,
-        Backend::Dummy,
-    ] {
-        match create_backend(backend).await {
-            Ok(b) => {
-                log::info!("using emulation backend: {backend}");
-                return Ok(b);
-            }
-            Err(e) if e.cancelled_by_user() => return Err(e),
-            Err(e) => log::warn!("{e}"),
-        }
-    }
-
-    Err(EmulationCreationError::NoAvailableBackend)
-}

input-emulation/src/libei.rs

@@ -34,7 +34,7 @@ use input_event::{Event, KeyboardEvent, PointerEvent};
 
 use crate::error::{EmulationError, ReisConvertStreamError};
 
-use super::{error::LibeiEmulationCreationError, EmulationHandle, InputEmulation};
+use super::{error::LibeiEmulationCreationError, Emulation, EmulationHandle};
 
 static INTERFACES: Lazy<HashMap<&'static str, u32>> = Lazy::new(|| {
     let mut m = HashMap::new();
@@ -60,7 +60,7 @@ struct Devices {
     keyboard: Arc<RwLock<Option<(ei::Device, ei::Keyboard)>>>,
 }
 
-pub struct LibeiEmulation<'a> {
+pub(crate) struct LibeiEmulation<'a> {
     context: ei::Context,
     devices: Devices,
     ei_task: JoinHandle<()>,
@@ -99,7 +99,7 @@ async fn get_ei_fd<'a>(
 }
 
 impl<'a> LibeiEmulation<'a> {
-    pub async fn new() -> Result<Self, LibeiEmulationCreationError> {
+    pub(crate) async fn new() -> Result<Self, LibeiEmulationCreationError> {
         let (_remote_desktop, session, eifd) = get_ei_fd().await?;
         let stream = UnixStream::from(eifd);
         stream.set_nonblocking(true)?;
@@ -147,7 +147,7 @@ impl<'a> Drop for LibeiEmulation<'a> {
 }
 
 #[async_trait]
-impl<'a> InputEmulation for LibeiEmulation<'a> {
+impl<'a> Emulation for LibeiEmulation<'a> {
     async fn consume(
         &mut self,
         event: Event,

input-emulation/src/macos.rs

@@ -1,4 +1,4 @@
-use super::{error::EmulationError, EmulationHandle, InputEmulation};
+use super::{error::EmulationError, Emulation, EmulationHandle};
 use async_trait::async_trait;
 use core_graphics::display::{CGDisplayBounds, CGMainDisplayID, CGPoint};
 use core_graphics::event::{
@@ -16,8 +16,8 @@ use super::error::MacOSEmulationCreationError;
 const DEFAULT_REPEAT_DELAY: Duration = Duration::from_millis(500);
 const DEFAULT_REPEAT_INTERVAL: Duration = Duration::from_millis(32);
 
-pub struct MacOSEmulation {
+pub(crate) struct MacOSEmulation {
-    pub event_source: CGEventSource,
+    event_source: CGEventSource,
     repeat_task: Option<AbortHandle>,
     button_state: ButtonState,
 }
@@ -53,7 +53,7 @@ impl IndexMut<CGMouseButton> for ButtonState {
 unsafe impl Send for MacOSEmulation {}
 
 impl MacOSEmulation {
-    pub fn new() -> Result<Self, MacOSEmulationCreationError> {
+    pub(crate) fn new() -> Result<Self, MacOSEmulationCreationError> {
         let event_source = CGEventSource::new(CGEventSourceStateID::CombinedSessionState)
             .map_err(|_| MacOSEmulationCreationError::EventSourceCreation)?;
         let button_state = ButtonState {
@@ -106,7 +106,7 @@ fn key_event(event_source: CGEventSource, key: u16, state: u8) {
 }
 
 #[async_trait]
-impl InputEmulation for MacOSEmulation {
+impl Emulation for MacOSEmulation {
     async fn consume(
         &mut self,
         event: Event,

input-emulation/src/windows.rs

@@ -19,23 +19,23 @@ use windows::Win32::UI::Input::KeyboardAndMouse::{
 };
 use windows::Win32::UI::WindowsAndMessaging::{XBUTTON1, XBUTTON2};
 
-use super::{EmulationHandle, InputEmulation};
+use super::{Emulation, EmulationHandle};
 
 const DEFAULT_REPEAT_DELAY: Duration = Duration::from_millis(500);
 const DEFAULT_REPEAT_INTERVAL: Duration = Duration::from_millis(32);
 
-pub struct WindowsEmulation {
+pub(crate) struct WindowsEmulation {
     repeat_task: Option<AbortHandle>,
 }
 
 impl WindowsEmulation {
-    pub fn new() -> Result<Self, WindowsEmulationCreationError> {
+    pub(crate) fn new() -> Result<Self, WindowsEmulationCreationError> {
         Ok(Self { repeat_task: None })
     }
 }
 
 #[async_trait]
-impl InputEmulation for WindowsEmulation {
+impl Emulation for WindowsEmulation {
     async fn consume(&mut self, event: Event, _: EmulationHandle) -> Result<(), EmulationError> {
         match event {
             Event::Pointer(pointer_event) => match pointer_event {

input-emulation/src/wlroots.rs

@@ -1,6 +1,6 @@
 use crate::error::EmulationError;
 
-use super::{error::WlrootsEmulationCreationError, InputEmulation};
+use super::{error::WlrootsEmulationCreationError, Emulation};
 use async_trait::async_trait;
 use std::collections::HashMap;
 use std::io;
@@ -50,7 +50,7 @@ pub(crate) struct WlrootsEmulation {
 }
 
 impl WlrootsEmulation {
-    pub fn new() -> Result<Self, WlrootsEmulationCreationError> {
+    pub(crate) fn new() -> Result<Self, WlrootsEmulationCreationError> {
         let conn = Connection::connect_to_env()?;
         let (globals, queue) = registry_queue_init::<State>(&conn)?;
         let qh = queue.handle();
@@ -116,7 +116,7 @@ impl State {
 }
 
 #[async_trait]
-impl InputEmulation for WlrootsEmulation {
+impl Emulation for WlrootsEmulation {
     async fn consume(
         &mut self,
         event: Event,

input-emulation/src/x11.rs

@@ -11,16 +11,16 @@ use input_event::{
 
 use crate::error::EmulationError;
 
-use super::{error::X11EmulationCreationError, EmulationHandle, InputEmulation};
+use super::{error::X11EmulationCreationError, Emulation, EmulationHandle};
 
-pub struct X11Emulation {
+pub(crate) struct X11Emulation {
     display: *mut xlib::Display,
 }
 
 unsafe impl Send for X11Emulation {}
 
 impl X11Emulation {
-    pub fn new() -> Result<Self, X11EmulationCreationError> {
+    pub(crate) fn new() -> Result<Self, X11EmulationCreationError> {
         let display = unsafe {
             match xlib::XOpenDisplay(ptr::null()) {
                 d if d == ptr::null::<xlib::Display>() as *mut xlib::Display => {
@@ -99,7 +99,7 @@ impl Drop for X11Emulation {
 }
 
 #[async_trait]
-impl InputEmulation for X11Emulation {
+impl Emulation for X11Emulation {
     async fn consume(&mut self, event: Event, _: EmulationHandle) -> Result<(), EmulationError> {
         match event {
             Event::Pointer(pointer_event) => match pointer_event {

input-emulation/src/xdg_desktop_portal.rs

@@ -16,15 +16,15 @@ use input_event::{
 
 use crate::error::EmulationError;
 
-use super::{error::XdpEmulationCreationError, EmulationHandle, InputEmulation};
+use super::{error::XdpEmulationCreationError, Emulation, EmulationHandle};
 
-pub struct DesktopPortalEmulation<'a> {
+pub(crate) struct DesktopPortalEmulation<'a> {
     proxy: RemoteDesktop<'a>,
     session: Session<'a, RemoteDesktop<'a>>,
 }
 
 impl<'a> DesktopPortalEmulation<'a> {
-    pub async fn new() -> Result<DesktopPortalEmulation<'a>, XdpEmulationCreationError> {
+    pub(crate) async fn new() -> Result<DesktopPortalEmulation<'a>, XdpEmulationCreationError> {
         log::debug!("connecting to org.freedesktop.portal.RemoteDesktop portal ...");
         let proxy = RemoteDesktop::new().await?;
 
@@ -56,7 +56,7 @@ impl<'a> DesktopPortalEmulation<'a> {
 }
 
 #[async_trait]
-impl<'a> InputEmulation for DesktopPortalEmulation<'a> {
+impl<'a> Emulation for DesktopPortalEmulation<'a> {
     async fn consume(
         &mut self,
         event: input_event::Event,

src/capture_test.rs

@@ -20,7 +20,7 @@ async fn input_capture_test(config: Config) -> Result<(), InputCaptureError> {
     log::info!("creating input capture");
     let backend = config.capture_backend.map(|b| b.into());
     loop {
-        let mut input_capture = input_capture::create(backend).await?;
+        let mut input_capture = InputCapture::new(backend).await?;
         log::info!("creating clients");
         input_capture.create(0, Position::Left).await?;
         input_capture.create(1, Position::Right).await?;
@@ -33,7 +33,7 @@ async fn input_capture_test(config: Config) -> Result<(), InputCaptureError> {
     }
 }
 
-async fn do_capture(input_capture: &mut Box<dyn InputCapture>) -> Result<(), CaptureError> {
+async fn do_capture(input_capture: &mut InputCapture) -> Result<(), CaptureError> {
     loop {
         let (client, event) = input_capture
             .next()

src/client.rs

@@ -125,8 +125,8 @@ pub struct ClientState {
     /// e.g. Laptops usually have at least an ethernet and a wifi port
     /// which have different ip addresses
     pub ips: HashSet<IpAddr>,
-    /// keys currently pressed by this client
+    /// client has pressed keys
-    pub pressed_keys: HashSet<u32>,
+    pub has_pressed_keys: bool,
     /// dns resolving in progress
     pub resolving: bool,
 }

src/emulation_test.rs

@@ -1,5 +1,6 @@
 use crate::config::Config;
 use anyhow::Result;
+use input_emulation::InputEmulation;
 use input_event::{Event, PointerEvent};
 use std::f64::consts::PI;
 use std::time::{Duration, Instant};
@@ -22,7 +23,7 @@ const RADIUS: f64 = 100.0;
 
 async fn input_emulation_test(config: Config) -> Result<()> {
     let backend = config.emulation_backend.map(|b| b.into());
-    let mut emulation = input_emulation::create(backend).await?;
+    let mut emulation = InputEmulation::new(backend).await?;
     emulation.create(0).await;
     let start = Instant::now();
     let mut offset = (0, 0);

src/server.rs

@@ -1,5 +1,5 @@
-use capture_task::CaptureEvent;
+use capture_task::CaptureRequest;
-use emulation_task::EmulationEvent;
+use emulation_task::EmulationRequest;
 use log;
 use std::{
     cell::{Cell, RefCell},
@@ -253,7 +253,7 @@ impl Server {
         self.notifies.capture.notify_waiters()
     }
 
-    async fn capture_notified(&self) {
+    async fn capture_enabled(&self) {
         self.notifies.capture.notified().await
     }
 
@@ -306,8 +306,8 @@ impl Server {
 
     async fn handle_request(
         &self,
-        capture: &Sender<CaptureEvent>,
+        capture: &Sender<CaptureRequest>,
-        emulate: &Sender<EmulationEvent>,
+        emulate: &Sender<EmulationRequest>,
         event: FrontendRequest,
     ) -> bool {
         log::debug!("frontend: {event:?}");
@@ -372,8 +372,8 @@ impl Server {
 
     async fn deactivate_client(
         &self,
-        capture: &Sender<CaptureEvent>,
+        capture: &Sender<CaptureRequest>,
-        emulate: &Sender<EmulationEvent>,
+        emulate: &Sender<EmulationRequest>,
         handle: ClientHandle,
     ) {
         log::debug!("deactivating client {handle}");
@@ -382,15 +382,15 @@ impl Server {
             None => return,
         };
 
-        let _ = capture.send(CaptureEvent::Destroy(handle)).await;
+        let _ = capture.send(CaptureRequest::Destroy(handle)).await;
-        let _ = emulate.send(EmulationEvent::Destroy(handle)).await;
+        let _ = emulate.send(EmulationRequest::Destroy(handle)).await;
         log::debug!("deactivating client {handle} done");
     }
 
     async fn activate_client(
         &self,
-        capture: &Sender<CaptureEvent>,
+        capture: &Sender<CaptureRequest>,
-        emulate: &Sender<EmulationEvent>,
+        emulate: &Sender<EmulationRequest>,
         handle: ClientHandle,
     ) {
         log::debug!("activating client");
@@ -415,15 +415,17 @@ impl Server {
         };
 
         /* notify emulation, capture and frontends */
-        let _ = capture.send(CaptureEvent::Create(handle, pos.into())).await;
+        let _ = capture
-        let _ = emulate.send(EmulationEvent::Create(handle)).await;
+            .send(CaptureRequest::Create(handle, pos.into()))
+            .await;
+        let _ = emulate.send(EmulationRequest::Create(handle)).await;
         log::debug!("activating client {handle} done");
     }
 
     async fn remove_client(
         &self,
-        capture: &Sender<CaptureEvent>,
+        capture: &Sender<CaptureRequest>,
-        emulate: &Sender<EmulationEvent>,
+        emulate: &Sender<EmulationRequest>,
         handle: ClientHandle,
     ) {
         let Some(active) = self
@@ -436,8 +438,14 @@ impl Server {
         };
 
         if active {
-            let _ = capture.send(CaptureEvent::Destroy(handle)).await;
+            let _ = capture.send(CaptureRequest::Destroy(handle)).await;
-            let _ = emulate.send(EmulationEvent::Destroy(handle)).await;
+            let _ = emulate.send(EmulationRequest::Destroy(handle)).await;
+        }
+    }
+
+    fn update_pressed_keys(&self, handle: ClientHandle, has_pressed_keys: bool) {
+        if let Some((_, s)) = self.client_manager.borrow_mut().get_mut(handle) {
+            s.has_pressed_keys = has_pressed_keys;
         }
     }
 
@@ -496,8 +504,8 @@ impl Server {
     async fn update_pos(
         &self,
         handle: ClientHandle,
-        capture: &Sender<CaptureEvent>,
+        capture: &Sender<CaptureRequest>,
-        emulate: &Sender<EmulationEvent>,
+        emulate: &Sender<EmulationRequest>,
         pos: Position,
     ) {
         let (changed, active) = {
@@ -514,11 +522,13 @@ impl Server {
         // update state in event input emulator & input capture
         if changed {
             if active {
-                let _ = capture.send(CaptureEvent::Destroy(handle)).await;
+                let _ = capture.send(CaptureRequest::Destroy(handle)).await;
-                let _ = emulate.send(EmulationEvent::Destroy(handle)).await;
+                let _ = emulate.send(EmulationRequest::Destroy(handle)).await;
             }
-            let _ = capture.send(CaptureEvent::Create(handle, pos.into())).await;
+            let _ = capture
-            let _ = emulate.send(EmulationEvent::Create(handle)).await;
+                .send(CaptureRequest::Create(handle, pos.into()))
+                .await;
+            let _ = emulate.send(EmulationRequest::Create(handle)).await;
         }
     }
 
@@ -557,6 +567,27 @@ impl Server {
             .get_mut(handle)
             .and_then(|(c, _)| c.hostname.clone())
     }
+
+    fn get_state(&self) -> State {
+        self.state.get()
+    }
+
+    fn set_state(&self, state: State) {
+        log::debug!("state => {state:?}");
+        self.state.replace(state);
+    }
+
+    fn set_active(&self, handle: Option<u64>) {
+        log::debug!("active client => {handle:?}");
+        self.active_client.replace(handle);
+    }
+
+    fn active_addr(&self, handle: u64) -> Option<SocketAddr> {
+        self.client_manager
+            .borrow()
+            .get(handle)
+            .and_then(|(_, s)| s.active_addr)
+    }
 }
 
 async fn listen_frontend(

src/server/capture_task.rs

@@ -1,5 +1,5 @@
 use futures::StreamExt;
-use std::{collections::HashSet, net::SocketAddr};
+use std::net::SocketAddr;
 
 use tokio::{
     process::Command,
@@ -9,14 +9,14 @@ use tokio::{
 
 use input_capture::{self, CaptureError, CaptureHandle, InputCapture, InputCaptureError, Position};
 
-use input_event::{scancode, Event, KeyboardEvent};
+use input_event::Event;
 
 use crate::{client::ClientHandle, frontend::Status, server::State};
 
 use super::Server;
 
 #[derive(Clone, Copy, Debug)]
-pub(crate) enum CaptureEvent {
+pub(crate) enum CaptureRequest {
     /// capture must release the mouse
     Release,
     /// add a capture client
@@ -27,7 +27,7 @@ pub(crate) enum CaptureEvent {
 
 pub(crate) fn new(
     server: Server,
-    capture_rx: Receiver<CaptureEvent>,
+    capture_rx: Receiver<CaptureRequest>,
     udp_send: Sender<(Event, SocketAddr)>,
 ) -> JoinHandle<()> {
     let backend = server.config.capture_backend.map(|b| b.into());
@@ -38,7 +38,7 @@ async fn capture_task(
     server: Server,
     backend: Option<input_capture::Backend>,
     sender_tx: Sender<(Event, SocketAddr)>,
-    mut notify_rx: Receiver<CaptureEvent>,
+    mut notify_rx: Receiver<CaptureRequest>,
 ) {
     loop {
         if let Err(e) = do_capture(backend, &server, &sender_tx, &mut notify_rx).await {
@@ -53,7 +53,7 @@ async fn capture_task(
         loop {
             tokio::select! {
                 _ = notify_rx.recv() => continue, /* need to ignore requests here! */
-                _ = server.capture_notified() => break,
+                _ = server.capture_enabled() => break,
                 _ = server.cancelled() => return,
             }
         }
@@ -64,50 +64,48 @@ async fn do_capture(
     backend: Option<input_capture::Backend>,
     server: &Server,
     sender_tx: &Sender<(Event, SocketAddr)>,
-    notify_rx: &mut Receiver<CaptureEvent>,
+    notify_rx: &mut Receiver<CaptureRequest>,
 ) -> Result<(), InputCaptureError> {
     /* allow cancelling capture request */
     let mut capture = tokio::select! {
-        r = input_capture::create(backend) => {
+        r = InputCapture::new(backend) => r?,
-            r?
-        },
         _ = server.cancelled() => return Ok(()),
     };
 
     server.set_capture_status(Status::Enabled);
 
-    // FIXME DUPLICATES
+    let clients = server.active_clients();
-    let clients = server
+    let clients = clients.iter().copied().map(|handle| {
-        .client_manager
+        (
-        .borrow()
+            handle,
-        .get_client_states()
+            server
-        .map(|(h, s)| (h, s.clone()))
+                .client_manager
-        .collect::<Vec<_>>();
+                .borrow()
-    log::info!("{clients:?}");
+                .get(handle)
-    for (handle, (config, _state)) in clients {
+                .map(|(c, _)| c.pos)
-        capture.create(handle, config.pos.into()).await?;
+                .expect("no such client"),
+        )
+    });
+    for (handle, pos) in clients {
+        capture.create(handle, pos.into()).await?;
     }
 
-    let mut pressed_keys = HashSet::new();
     loop {
         tokio::select! {
-            event = capture.next() => {
+            event = capture.next() => match event {
-                match event {
+                Some(event) => handle_capture_event(server, &mut capture, sender_tx, event?).await?,
-                    Some(Ok(event)) => handle_capture_event(server, &mut capture, sender_tx, event, &mut pressed_keys).await?,
+                None => return Ok(()),
-                    Some(Err(e)) => return Err(e.into()),
+            },
-                    None => return Ok(()),
-                }
-            }
             e = notify_rx.recv() => {
                 log::debug!("input capture notify rx: {e:?}");
                 match e {
                     Some(e) => match e {
-                        CaptureEvent::Release => {
+                        CaptureRequest::Release => {
                             capture.release().await?;
                             server.state.replace(State::Receiving);
                         }
-                        CaptureEvent::Create(h, p) => capture.create(h, p).await?,
+                        CaptureRequest::Create(h, p) => capture.create(h, p).await?,
-                        CaptureEvent::Destroy(h) => capture.destroy(h).await?,
+                        CaptureRequest::Destroy(h) => capture.destroy(h).await?,
                     },
                     None => break,
                 }
@@ -119,92 +117,44 @@ async fn do_capture(
     Ok(())
 }
 
-fn update_pressed_keys(pressed_keys: &mut HashSet<scancode::Linux>, key: u32, state: u8) {
-    if let Ok(scancode) = scancode::Linux::try_from(key) {
-        log::debug!("key: {key}, state: {state}, scancode: {scancode:?}");
-        match state {
-            1 => pressed_keys.insert(scancode),
-            _ => pressed_keys.remove(&scancode),
-        };
-    }
-}
-
 async fn handle_capture_event(
     server: &Server,
-    capture: &mut Box<dyn InputCapture>,
+    capture: &mut InputCapture,
     sender_tx: &Sender<(Event, SocketAddr)>,
     event: (CaptureHandle, Event),
-    pressed_keys: &mut HashSet<scancode::Linux>,
 ) -> Result<(), CaptureError> {
-    let (handle, mut e) = event;
+    let (handle, event) = event;
-    log::trace!("({handle}) {e:?}");
+    log::trace!("({handle}) {event:?}");
 
-    if let Event::Keyboard(KeyboardEvent::Key { key, state, .. }) = e {
+    // capture started
-        update_pressed_keys(pressed_keys, key, state);
+    if event == Event::Enter() {
-        log::debug!("{pressed_keys:?}");
+        server.set_state(State::AwaitingLeave);
-        if server.release_bind.iter().all(|k| pressed_keys.contains(k)) {
+        server.set_active(Some(handle));
-            pressed_keys.clear();
-            log::info!("releasing pointer");
-            capture.release().await?;
-            server.state.replace(State::Receiving);
-            log::trace!("STATE ===> Receiving");
-            // send an event to release all the modifiers
-            e = Event::Disconnect();
-        }
-    }
-
-    let info = {
-        let mut enter = false;
-        let mut start_timer = false;
-
-        // get client state for handle
-        let mut client_manager = server.client_manager.borrow_mut();
-        let client_state = client_manager.get_mut(handle).map(|(_, s)| s);
-        if let Some(client_state) = client_state {
-            // if we just entered the client we want to send additional enter events until
-            // we get a leave event
-            if let Event::Enter() = e {
-                server.state.replace(State::AwaitingLeave);
-                server.active_client.replace(Some(handle));
-                log::trace!("Active client => {}", handle);
-                start_timer = true;
-                log::trace!("STATE ===> AwaitingLeave");
-                enter = true;
-            } else {
-                // ignore any potential events in receiving mode
-                if server.state.get() == State::Receiving && e != Event::Disconnect() {
-                    return Ok(());
-                }
-            }
-            Some((client_state.active_addr, enter, start_timer))
-        } else {
-            None
-        }
-    };
-
-    let (addr, enter, start_timer) = match info {
-        Some(i) => i,
-        None => {
-            // should not happen
-            log::warn!("unknown client!");
-            capture.release().await?;
-            server.state.replace(State::Receiving);
-            log::trace!("STATE ===> Receiving");
-            return Ok(());
-        }
-    };
-
-    if start_timer {
         server.restart_ping_timer();
-    }
-    if enter {
         spawn_hook_command(server, handle);
     }
-    if let Some(addr) = addr {
+
-        if enter {
+    // release capture if emulation set state to Receiveing
-            let _ = sender_tx.send((Event::Enter(), addr)).await;
+    if server.get_state() == State::Receiving {
-        }
+        capture.release().await?;
-        let _ = sender_tx.send((e, addr)).await;
+        return Ok(());
+    }
+
+    // check release bind
+    if capture.keys_pressed(&server.release_bind) {
+        capture.release().await?;
+        server.set_state(State::Receiving);
+    }
+
+    if let Some(addr) = server.active_addr(handle) {
+        let event = match server.get_state() {
+            State::Sending => event,
+            /* send additional enter events until acknowleged */
+            State::AwaitingLeave => Event::Enter(),
+            /* released capture */
+            State::Receiving => Event::Disconnect(),
+        };
+        sender_tx.send((event, addr)).await.expect("sender closed");
     }
     Ok(())
 }

src/server/emulation_task.rs

@@ -11,12 +11,12 @@ use crate::{
     server::State,
 };
 use input_emulation::{self, EmulationError, EmulationHandle, InputEmulation, InputEmulationError};
-use input_event::{Event, KeyboardEvent};
+use input_event::Event;
 
-use super::{network_task::NetworkError, CaptureEvent, Server};
+use super::{network_task::NetworkError, CaptureRequest, Server};
 
 #[derive(Clone, Debug)]
-pub(crate) enum EmulationEvent {
+pub(crate) enum EmulationRequest {
     /// create a new client
     Create(EmulationHandle),
     /// destroy a client
@@ -27,10 +27,10 @@ pub(crate) enum EmulationEvent {
 
 pub(crate) fn new(
     server: Server,
-    emulation_rx: Receiver<EmulationEvent>,
+    emulation_rx: Receiver<EmulationRequest>,
     udp_rx: Receiver<Result<(Event, SocketAddr), NetworkError>>,
     sender_tx: Sender<(Event, SocketAddr)>,
-    capture_tx: Sender<CaptureEvent>,
+    capture_tx: Sender<CaptureRequest>,
 ) -> JoinHandle<()> {
     let emulation_task = emulation_task(server, emulation_rx, udp_rx, sender_tx, capture_tx);
     tokio::task::spawn_local(emulation_task)
@@ -38,10 +38,10 @@ pub(crate) fn new(
 
 async fn emulation_task(
     server: Server,
-    mut rx: Receiver<EmulationEvent>,
+    mut rx: Receiver<EmulationRequest>,
     mut udp_rx: Receiver<Result<(Event, SocketAddr), NetworkError>>,
     sender_tx: Sender<(Event, SocketAddr)>,
-    capture_tx: Sender<CaptureEvent>,
+    capture_tx: Sender<CaptureRequest>,
 ) {
     loop {
         if let Err(e) = do_emulation(&server, &mut rx, &mut udp_rx, &sender_tx, &capture_tx).await {
@@ -65,17 +65,15 @@ async fn emulation_task(
 
 async fn do_emulation(
     server: &Server,
-    rx: &mut Receiver<EmulationEvent>,
+    rx: &mut Receiver<EmulationRequest>,
     udp_rx: &mut Receiver<Result<(Event, SocketAddr), NetworkError>>,
     sender_tx: &Sender<(Event, SocketAddr)>,
-    capture_tx: &Sender<CaptureEvent>,
+    capture_tx: &Sender<CaptureRequest>,
 ) -> Result<(), InputEmulationError> {
     let backend = server.config.emulation_backend.map(|b| b.into());
     log::info!("creating input emulation...");
     let mut emulation = tokio::select! {
-        r = input_emulation::create(backend) => {
+        r = InputEmulation::new(backend) => r?,
-            r?
-        }
         _ = server.cancelled() => return Ok(()),
     };
 
@@ -87,23 +85,17 @@ async fn do_emulation(
     }
 
     let res = do_emulation_session(server, &mut emulation, rx, udp_rx, sender_tx, capture_tx).await;
-
+    emulation.terminate().await; // manual drop
-    // release potentially still pressed keys
+    res
-    release_all_keys(server, &mut emulation).await?;
-
-    emulation.terminate().await;
-    res?;
-
-    Ok(())
 }
 
 async fn do_emulation_session(
     server: &Server,
-    emulation: &mut Box<dyn InputEmulation>,
+    emulation: &mut InputEmulation,
-    rx: &mut Receiver<EmulationEvent>,
+    rx: &mut Receiver<EmulationRequest>,
     udp_rx: &mut Receiver<Result<(Event, SocketAddr), NetworkError>>,
     sender_tx: &Sender<(Event, SocketAddr)>,
-    capture_tx: &Sender<CaptureEvent>,
+    capture_tx: &Sender<CaptureRequest>,
 ) -> Result<(), InputEmulationError> {
     let mut last_ignored = None;
 
@@ -121,9 +113,9 @@ async fn do_emulation_session(
             }
             emulate_event = rx.recv() => {
                 match emulate_event.expect("channel closed") {
-                    EmulationEvent::Create(h) => emulation.create(h).await,
+                    EmulationRequest::Create(h) => { let _ = emulation.create(h).await; },
-                    EmulationEvent::Destroy(h) => emulation.destroy(h).await,
+                    EmulationRequest::Destroy(h) => emulation.destroy(h).await,
-                    EmulationEvent::ReleaseKeys(c) => release_keys(server, emulation, c).await?,
+                    EmulationRequest::ReleaseKeys(c) => emulation.release_keys(c).await?,
                 }
             }
             _ = server.notifies.cancel.cancelled() => break Ok(()),
@@ -133,8 +125,8 @@ async fn do_emulation_session(
 
 async fn handle_udp_rx(
     server: &Server,
-    capture_tx: &Sender<CaptureEvent>,
+    capture_tx: &Sender<CaptureRequest>,
-    emulate: &mut Box<dyn InputEmulation>,
+    emulate: &mut InputEmulation,
     sender_tx: &Sender<(Event, SocketAddr)>,
     last_ignored: &mut Option<SocketAddr>,
     event: (Event, SocketAddr),
@@ -155,9 +147,7 @@ async fn handle_udp_rx(
         (Event::Ping(), addr) => {
             let _ = sender_tx.send((Event::Pong(), addr)).await;
         }
-        (Event::Disconnect(), _) => {
+        (Event::Disconnect(), _) => emulate.release_keys(handle).await?,
-            release_keys(server, emulate, handle).await?;
-        }
         (event, addr) => {
             // tell clients that we are ready to receive events
             if let Event::Enter() = event {
@@ -172,32 +162,17 @@ async fn handle_udp_rx(
                     } else {
                         // upon receiving any event, we go back to receiving mode
                         server.state.replace(State::Receiving);
-                        let _ = capture_tx.send(CaptureEvent::Release).await;
+                        let _ = capture_tx.send(CaptureRequest::Release).await;
                         log::trace!("STATE ===> Receiving");
                     }
                 }
                 State::Receiving => {
-                    let ignore_event =
+                    log::trace!("{event} => emulate");
-                        if let Event::Keyboard(KeyboardEvent::Key { key, state, .. }) = event {
+                    emulate.consume(event, handle).await?;
-                            let (ignore_event, restart_timer) = update_client_keys(
+                    let has_pressed_keys = emulate.has_pressed_keys(handle);
-                                &mut server.client_manager.borrow_mut(),
+                    server.update_pressed_keys(handle, has_pressed_keys);
-                                handle,
+                    if has_pressed_keys {
-                                key,
+                        server.restart_ping_timer();
-                                state,
-                            );
-                            // restart timer if necessary
-                            if restart_timer {
-                                server.restart_ping_timer();
-                            }
-                            ignore_event
-                        } else {
-                            false
-                        };
-                    // workaround buggy rdp backend.
-                    if !ignore_event {
-                        // consume event
-                        emulate.consume(event, handle).await?;
-                        log::trace!("{event} => emulate");
                     }
                 }
                 State::AwaitingLeave => {
@@ -214,7 +189,7 @@ async fn handle_udp_rx(
                     // event should still be possible
                     if let Event::Enter() = event {
                         server.state.replace(State::Receiving);
-                        let _ = capture_tx.send(CaptureEvent::Release).await;
+                        let _ = capture_tx.send(CaptureRequest::Release).await;
                         log::trace!("STATE ===> Receiving");
                     }
                 }
@@ -224,57 +199,6 @@ async fn handle_udp_rx(
     Ok(())
 }
 
-async fn release_all_keys(
-    server: &Server,
-    emulation: &mut Box<dyn InputEmulation>,
-) -> Result<(), EmulationError> {
-    let clients = server
-        .client_manager
-        .borrow()
-        .get_client_states()
-        .map(|(h, _)| h)
-        .collect::<Vec<_>>();
-    for client in clients {
-        release_keys(server, emulation, client).await?;
-    }
-    Ok(())
-}
-
-async fn release_keys(
-    server: &Server,
-    emulate: &mut Box<dyn InputEmulation>,
-    client: ClientHandle,
-) -> Result<(), EmulationError> {
-    let keys = server
-        .client_manager
-        .borrow_mut()
-        .get_mut(client)
-        .iter_mut()
-        .flat_map(|(_, s)| s.pressed_keys.drain())
-        .collect::<Vec<_>>();
-
-    for key in keys {
-        let event = Event::Keyboard(KeyboardEvent::Key {
-            time: 0,
-            key,
-            state: 0,
-        });
-        emulate.consume(event, client).await?;
-        if let Ok(key) = input_event::scancode::Linux::try_from(key) {
-            log::warn!("releasing stuck key: {key:?}");
-        }
-    }
-
-    let event = Event::Keyboard(KeyboardEvent::Modifiers {
-        mods_depressed: 0,
-        mods_latched: 0,
-        mods_locked: 0,
-        group: 0,
-    });
-    emulate.consume(event, client).await?;
-    Ok(())
-}
-
 fn activate_client_if_exists(
     client_manager: &mut ClientManager,
     addr: SocketAddr,
@@ -299,25 +223,3 @@ fn activate_client_if_exists(
     client_state.active_addr = Some(addr);
     Some(handle)
 }
-
-fn update_client_keys(
-    client_manager: &mut ClientManager,
-    handle: ClientHandle,
-    key: u32,
-    state: u8,
-) -> (bool, bool) {
-    let Some(client_state) = client_manager.get_mut(handle).map(|(_, s)| s) else {
-        return (true, false);
-    };
-
-    // ignore double press / release events
-    let ignore_event = if state == 0 {
-        // ignore release event if key not pressed
-        !client_state.pressed_keys.remove(&key)
-    } else {
-        // ignore press event if key not released
-        !client_state.pressed_keys.insert(key)
-    };
-    let restart_timer = !client_state.pressed_keys.is_empty();
-    (ignore_event, restart_timer)
-}

src/server/ping_task.rs

@@ -6,15 +6,15 @@ use input_event::Event;
 
 use crate::client::ClientHandle;
 
-use super::{capture_task::CaptureEvent, emulation_task::EmulationEvent, Server, State};
+use super::{capture_task::CaptureRequest, emulation_task::EmulationRequest, Server, State};
 
 const MAX_RESPONSE_TIME: Duration = Duration::from_millis(500);
 
 pub(crate) fn new(
     server: Server,
     sender_ch: Sender<(Event, SocketAddr)>,
-    emulate_notify: Sender<EmulationEvent>,
+    emulate_notify: Sender<EmulationRequest>,
-    capture_notify: Sender<CaptureEvent>,
+    capture_notify: Sender<CaptureRequest>,
 ) -> JoinHandle<()> {
     // timer task
     tokio::task::spawn_local(async move {
@@ -28,8 +28,8 @@ pub(crate) fn new(
 async fn ping_task(
     server: &Server,
     sender_ch: Sender<(Event, SocketAddr)>,
-    emulate_notify: Sender<EmulationEvent>,
+    emulate_notify: Sender<EmulationRequest>,
-    capture_notify: Sender<CaptureEvent>,
+    capture_notify: Sender<CaptureRequest>,
 ) {
     loop {
         // wait for wake up signal
@@ -42,8 +42,8 @@ async fn ping_task(
                 let ping_clients: Vec<ClientHandle> = if receiving {
                     // if receiving we care about clients with pressed keys
                     client_manager
-                        .get_client_states_mut()
+                        .get_client_states()
-                        .filter(|(_, (_, s))| !s.pressed_keys.is_empty())
+                        .filter(|(_, (_, s))| s.has_pressed_keys)
                         .map(|(h, _)| h)
                         .collect()
                 } else {
@@ -123,14 +123,14 @@ async fn ping_task(
             if receiving {
                 for h in unresponsive_clients {
                     log::warn!("device not responding, releasing keys!");
-                    let _ = emulate_notify.send(EmulationEvent::ReleaseKeys(h)).await;
+                    let _ = emulate_notify.send(EmulationRequest::ReleaseKeys(h)).await;
                 }
             } else {
                 // release pointer if the active client has not responded
                 if !unresponsive_clients.is_empty() {
                     log::warn!("client not responding, releasing pointer!");
                     server.state.replace(State::Receiving);
-                    let _ = capture_notify.send(CaptureEvent::Release).await;
+                    let _ = capture_notify.send(CaptureRequest::Release).await;
                 }
             }
         }