fix drop impl for desktop-portal

capture backend can now be configured via the `capture_backend` cli argument / config entry

Cargo.toml

@@ -1,3 +1,10 @@
+[workspace]
+members = [
+    "input-capture",
+    "input-emulation",
+    "input-event",
+]
+
 [package]
 name = "lan-mouse"
 description = "Software KVM Switch / mouse & keyboard sharing software for Local Area Networks"
@@ -6,16 +13,16 @@ edition = "2021"
 license = "GPL-3.0-or-later"
 repository = "https://github.com/ferdinandschober/lan-mouse"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
 [profile.release]
 strip = true
 lto = "fat"
 
 [dependencies]
-tempfile = "3.8"
+input-event = { path = "input-event", version = "0.1.0" }
+input-emulation = { path = "input-emulation", version = "0.1.0", default-features = false }
+input-capture = { path = "input-capture", version = "0.1.0", default-features = false }
+
 hickory-resolver = "0.24.1"
-memmap = "0.7"
 toml = "0.8"
 serde = { version = "1.0", features = ["derive"] }
 anyhow = "1.0.71"
@@ -23,52 +30,26 @@ 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", "process", "rt", "sync", "signal"] }
-async-trait = "0.1.73"
-futures-core = "0.3.28"
 futures = "0.3.28"
 clap = { version="4.4.11", features = ["derive"] }
 gtk = { package = "gtk4", version = "0.8.1", features = ["v4_2"], optional = true }
 adw = { package = "libadwaita", version = "0.6.0", features = ["v1_1"], optional = true }
 async-channel = { version = "2.1.1", optional = true }
-keycode = "0.4.0"
-once_cell = "1.19.0"
-num_enum = "0.7.2"
 hostname = "0.4.0"
 slab = "0.4.9"
+endi = "1.1.0"
+thiserror = "1.0.61"
 
 [target.'cfg(unix)'.dependencies]
 libc = "0.2.148"
 
-[target.'cfg(all(unix, not(target_os="macos")))'.dependencies]
-wayland-client = { version="0.31.1", optional = true }
-wayland-protocols = { version="0.31.0", features=["client", "staging", "unstable"], optional = true }
-wayland-protocols-wlr = { version="0.2.0", features=["client"], optional = true }
-wayland-protocols-misc = { version="0.2.0", features=["client"], optional = true }
-x11 = { version = "2.21.0", features = ["xlib", "xtest"], optional = true }
-ashpd = { version = "0.8", default-features = false, features = ["tokio"], optional = true }
-reis = { version = "0.2", features = [ "tokio" ], optional = true }
-
-[target.'cfg(target_os="macos")'.dependencies]
-core-graphics = { version = "0.23", features = ["highsierra"] }
-
-[target.'cfg(windows)'.dependencies]
-windows = {  version = "0.54.0", features = [
-    "Win32_System_LibraryLoader",
-    "Win32_System_Threading",
-    "Win32_Foundation",
-    "Win32_Graphics",
-    "Win32_Graphics_Gdi",
-    "Win32_UI_Input_KeyboardAndMouse",
-    "Win32_UI_WindowsAndMessaging",
-] }
-
 [build-dependencies]
 glib-build-tools = { version = "0.19.0", optional = true }
 
 [features]
-default = ["wayland", "x11", "xdg_desktop_portal", "libei", "gtk"]
+default = [ "wayland", "x11", "xdg_desktop_portal", "libei", "gtk" ]
-wayland = ["dep:wayland-client", "dep:wayland-protocols", "dep:wayland-protocols-wlr", "dep:wayland-protocols-misc" ]
+wayland = [ "input-capture/wayland", "input-emulation/wayland" ]
-x11 = ["dep:x11"]
+x11 = [ "input-capture/x11", "input-emulation/x11" ]
-xdg_desktop_portal = ["dep:ashpd"]
+xdg_desktop_portal = [ "input-emulation/xdg_desktop_portal" ]
-libei = ["dep:reis", "dep:ashpd"]
+libei = [ "input-capture/libei", "input-emulation/libei" ]
 gtk = ["dep:gtk", "dep:adw", "dep:async-channel", "dep:glib-build-tools"]

README.md

@@ -69,7 +69,15 @@ Precompiled release binaries for Windows, MacOS and Linux are available in the [
 For Windows, the depenedencies are included in the .zip file, for other operating systems see [Installing Dependencies](#installing-dependencies).
 
 ### Arch Linux
-Lan Mouse is available on the AUR:
+
+Lan Mouse can be installed from the [official repositories](https://archlinux.org/packages/extra/x86_64/lan-mouse/):
+
+```sh
+pacman -S lan-mouse
+```
+
+It is also available on the AUR:
+
 ```sh
 # git version (includes latest changes)
 paru -S lan-mouse-git

config.toml

@@ -1,5 +1,7 @@
 # example configuration
 
+# capture_backend = "LayerShell"
+
 # release bind
 release_bind = [ "KeyA", "KeyS", "KeyD", "KeyF" ]
 

flake.lock

@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1710806803,
+        "lastModified": 1716293225,
-        "narHash": "sha256-qrxvLS888pNJFwJdK+hf1wpRCSQcqA6W5+Ox202NDa0=",
+        "narHash": "sha256-pU9ViBVE3XYb70xZx+jK6SEVphvt7xMTbm6yDIF4xPs=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "b06025f1533a1e07b6db3e75151caa155d1c7eb3",
+        "rev": "3eaeaeb6b1e08a016380c279f8846e0bd8808916",
         "type": "github"
       },
       "original": {
@@ -48,11 +48,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1710987136,
+        "lastModified": 1716257780,
-        "narHash": "sha256-Q8GRdlAIKZ8tJUXrbcRO1pA33AdoPfTUirsSnmGQnOU=",
+        "narHash": "sha256-R+NjvJzKEkTVCmdrKRfPE4liX/KMGVqGUwwS5H8ET8A=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "97596b54ac34ad8184ca1eef44b1ec2e5c2b5f9e",
+        "rev": "4e5e3d2c5c9b2721bd266f9e43c14e96811b89d2",
         "type": "github"
       },
       "original": {

input-capture/Cargo.toml

@@ -0,0 +1,48 @@
+[package]
+name = "input-capture"
+description = "cross-platform input-capture library used by lan-mouse"
+version = "0.1.0"
+edition = "2021"
+license = "GPL-3.0-or-later"
+repository = "https://github.com/ferdinandschober/lan-mouse"
+
+[dependencies]
+anyhow = "1.0.86"
+futures = "0.3.28"
+futures-core = "0.3.30"
+log = "0.4.22"
+input-event = { path = "../input-event", version = "0.1.0" }
+memmap = "0.7"
+tempfile = "3.8"
+thiserror = "1.0.61"
+tokio = { version = "1.32.0", features = ["io-util", "io-std", "macros", "net", "process", "rt", "sync", "signal"] }
+once_cell = "1.19.0"
+
+
+[target.'cfg(all(unix, not(target_os="macos")))'.dependencies]
+wayland-client = { version="0.31.1", optional = true }
+wayland-protocols = { version="0.32.1", features=["client", "staging", "unstable"], optional = true }
+wayland-protocols-wlr = { version="0.3.1", features=["client"], optional = true }
+x11 = { version = "2.21.0", features = ["xlib", "xtest"], optional = true }
+ashpd = { version = "0.8", default-features = false, features = ["tokio"], optional = true }
+reis = { version = "0.2", features = [ "tokio" ], optional = true }
+
+[target.'cfg(target_os="macos")'.dependencies]
+core-graphics = { version = "0.23", features = ["highsierra"] }
+
+[target.'cfg(windows)'.dependencies]
+windows = {  version = "0.57.0", features = [
+    "Win32_System_LibraryLoader",
+    "Win32_System_Threading",
+    "Win32_Foundation",
+    "Win32_Graphics",
+    "Win32_Graphics_Gdi",
+    "Win32_UI_Input_KeyboardAndMouse",
+    "Win32_UI_WindowsAndMessaging",
+] }
+
+[features]
+default = ["wayland", "x11", "libei"]
+wayland = ["dep:wayland-client", "dep:wayland-protocols", "dep:wayland-protocols-wlr" ]
+x11 = ["dep:x11"]
+libei = ["dep:reis", "dep:ashpd"]

input-capture/src/dummy.rs

@@ -4,10 +4,9 @@ use std::task::{Context, Poll};
 
 use futures_core::Stream;
 
-use crate::capture::InputCapture;
+use input_event::Event;
-use crate::event::Event;
 
-use crate::client::{ClientEvent, ClientHandle};
+use super::{CaptureHandle, InputCapture, Position};
 
 pub struct DummyInputCapture {}
 
@@ -24,7 +23,11 @@ impl Default for DummyInputCapture {
 }
 
 impl InputCapture for DummyInputCapture {
-    fn notify(&mut self, _event: ClientEvent) -> io::Result<()> {
+    fn create(&mut self, _handle: CaptureHandle, _pos: Position) -> io::Result<()> {
+        Ok(())
+    }
+
+    fn destroy(&mut self, _handle: CaptureHandle) -> io::Result<()> {
         Ok(())
     }
 
@@ -34,7 +37,7 @@ impl InputCapture for DummyInputCapture {
 }
 
 impl Stream for DummyInputCapture {
-    type Item = io::Result<(ClientHandle, Event)>;
+    type Item = io::Result<(CaptureHandle, Event)>;
 
     fn poll_next(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
         Poll::Pending

input-capture/src/error.rs

@@ -0,0 +1,142 @@
+use std::fmt::Display;
+use thiserror::Error;
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+use std::io;
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+use wayland_client::{
+    backend::WaylandError,
+    globals::{BindError, GlobalError},
+    ConnectError, DispatchError,
+};
+
+#[derive(Debug, Error)]
+pub enum CaptureCreationError {
+    NoAvailableBackend,
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    Libei(#[from] LibeiCaptureCreationError),
+    #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+    LayerShell(#[from] LayerShellCaptureCreationError),
+    #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+    X11(#[from] X11InputCaptureCreationError),
+    #[cfg(target_os = "macos")]
+    Macos(#[from] MacOSInputCaptureCreationError),
+    #[cfg(windows)]
+    Windows,
+}
+
+impl Display for CaptureCreationError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let reason = match self {
+            #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+            CaptureCreationError::Libei(reason) => {
+                format!("error creating portal backend: {reason}")
+            }
+            #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+            CaptureCreationError::LayerShell(reason) => {
+                format!("error creating layer-shell backend: {reason}")
+            }
+            #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+            CaptureCreationError::X11(e) => format!("{e}"),
+            #[cfg(target_os = "macos")]
+            CaptureCreationError::Macos(e) => format!("{e}"),
+            #[cfg(windows)]
+            CaptureCreationError::Windows => String::new(),
+            CaptureCreationError::NoAvailableBackend => "no available backend".to_string(),
+        };
+        write!(f, "could not create input capture: {reason}")
+    }
+}
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum LibeiCaptureCreationError {
+    Ashpd(#[from] ashpd::Error),
+}
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+impl Display for LibeiCaptureCreationError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            LibeiCaptureCreationError::Ashpd(portal_error) => write!(f, "{portal_error}"),
+        }
+    }
+}
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub struct WaylandBindError {
+    inner: BindError,
+    protocol: &'static str,
+}
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+impl WaylandBindError {
+    pub(crate) fn new(inner: BindError, protocol: &'static str) -> Self {
+        Self { inner, protocol }
+    }
+}
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+impl Display for WaylandBindError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "{} protocol not supported: {}",
+            self.protocol, self.inner
+        )
+    }
+}
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum LayerShellCaptureCreationError {
+    Connect(#[from] ConnectError),
+    Global(#[from] GlobalError),
+    Wayland(#[from] WaylandError),
+    Bind(#[from] WaylandBindError),
+    Dispatch(#[from] DispatchError),
+    Io(#[from] io::Error),
+}
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+impl Display for LayerShellCaptureCreationError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            LayerShellCaptureCreationError::Bind(e) => write!(f, "{e}"),
+            LayerShellCaptureCreationError::Connect(e) => {
+                write!(f, "could not connect to wayland compositor: {e}")
+            }
+            LayerShellCaptureCreationError::Global(e) => write!(f, "wayland error: {e}"),
+            LayerShellCaptureCreationError::Wayland(e) => write!(f, "wayland error: {e}"),
+            LayerShellCaptureCreationError::Dispatch(e) => {
+                write!(f, "error dispatching wayland events: {e}")
+            }
+            LayerShellCaptureCreationError::Io(e) => write!(f, "io error: {e}"),
+        }
+    }
+}
+
+#[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum X11InputCaptureCreationError {
+    NotImplemented,
+}
+
+#[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+impl Display for X11InputCaptureCreationError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "X11 input capture is not yet implemented :(")
+    }
+}
+#[cfg(target_os = "macos")]
+#[derive(Debug, Error)]
+pub enum MacOSInputCaptureCreationError {
+    NotImplemented,
+}
+
+#[cfg(target_os = "macos")]
+impl Display for MacOSInputCaptureCreationError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "macos input capture is not yet implemented :(")
+    }
+}

input-capture/src/lib.rs

@@ -0,0 +1,159 @@
+use std::{fmt::Display, io};
+
+use futures_core::Stream;
+
+use input_event::Event;
+
+use self::error::CaptureCreationError;
+
+pub mod error;
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+pub mod libei;
+
+#[cfg(target_os = "macos")]
+pub mod macos;
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+pub mod wayland;
+
+#[cfg(windows)]
+pub mod windows;
+
+#[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+pub mod x11;
+
+/// fallback input capture (does not produce events)
+pub mod dummy;
+
+pub type CaptureHandle = u64;
+
+#[derive(Debug, Clone, Copy, Eq, Hash, PartialEq)]
+pub enum Position {
+    Left,
+    Right,
+    Top,
+    Bottom,
+}
+
+impl Position {
+    pub fn opposite(&self) -> Self {
+        match self {
+            Position::Left => Self::Right,
+            Position::Right => Self::Left,
+            Position::Top => Self::Bottom,
+            Position::Bottom => Self::Top,
+        }
+    }
+}
+
+impl Display for Position {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let pos = match self {
+            Position::Left => "left",
+            Position::Right => "right",
+            Position::Top => "top",
+            Position::Bottom => "bottom",
+        };
+        write!(f, "{}", pos)
+    }
+}
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub enum Backend {
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    InputCapturePortal,
+    #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+    LayerShell,
+    #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+    X11,
+    #[cfg(windows)]
+    Windows,
+    #[cfg(target_os = "macos")]
+    MacOs,
+    Dummy,
+}
+
+impl Display for Backend {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+            Backend::InputCapturePortal => write!(f, "input-capture-portal"),
+            #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+            Backend::LayerShell => write!(f, "layer-shell"),
+            #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+            Backend::X11 => write!(f, "X11"),
+            #[cfg(windows)]
+            Backend::Windows => write!(f, "windows"),
+            #[cfg(target_os = "macos")]
+            Backend::MacOs => write!(f, "MacOS"),
+            Backend::Dummy => write!(f, "dummy"),
+        }
+    }
+}
+
+pub trait InputCapture: Stream<Item = io::Result<(CaptureHandle, Event)>> + Unpin {
+    /// create a new client with the given id
+    fn create(&mut self, id: CaptureHandle, pos: Position) -> io::Result<()>;
+
+    /// destroy the client with the given id, if it exists
+    fn destroy(&mut self, id: CaptureHandle) -> io::Result<()>;
+
+    /// release mouse
+    fn release(&mut self) -> io::Result<()>;
+}
+
+pub async fn create_backend(
+    backend: Backend,
+) -> Result<Box<dyn InputCapture<Item = io::Result<(CaptureHandle, Event)>>>, CaptureCreationError>
+{
+    match backend {
+        #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+        Backend::InputCapturePortal => Ok(Box::new(libei::LibeiInputCapture::new().await?)),
+        #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+        Backend::LayerShell => Ok(Box::new(wayland::WaylandInputCapture::new()?)),
+        #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+        Backend::X11 => Ok(Box::new(x11::X11InputCapture::new()?)),
+        #[cfg(windows)]
+        Backend::Windows => Ok(Box::new(windows::WindowsInputCapture::new())),
+        #[cfg(target_os = "macos")]
+        Backend::MacOs => Ok(Box::new(macos::MacOSInputCapture::new()?)),
+        Backend::Dummy => Ok(Box::new(dummy::DummyInputCapture::new())),
+    }
+}
+
+pub async fn create(
+    backend: Option<Backend>,
+) -> Result<Box<dyn InputCapture<Item = io::Result<(CaptureHandle, Event)>>>, CaptureCreationError>
+{
+    if let Some(backend) = backend {
+        let b = create_backend(backend).await;
+        if b.is_ok() {
+            log::info!("using capture backend: {backend}");
+        }
+        return b;
+    }
+
+    for backend in [
+        #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+        Backend::InputCapturePortal,
+        #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+        Backend::LayerShell,
+        #[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 capture backend: {backend}");
+                return Ok(b);
+            }
+            Err(e) => log::warn!("{backend} input capture backend unavailable: {e}"),
+        }
+    }
+    Err(CaptureCreationError::NoAvailableBackend)
+}

input-capture/src/libei.rs

@@ -30,23 +30,24 @@ use tokio::{
 use futures_core::Stream;
 use once_cell::sync::Lazy;
 
-use crate::{
+use input_event::{Event, KeyboardEvent, PointerEvent};
-    capture::InputCapture as LanMouseInputCapture,
+
-    client::{ClientEvent, ClientHandle, Position},
+use super::{
-    event::{Event, KeyboardEvent, PointerEvent},
+    error::LibeiCaptureCreationError, CaptureHandle, InputCapture as LanMouseInputCapture, Position,
 };
 
 #[derive(Debug)]
 enum ProducerEvent {
     Release,
-    ClientEvent(ClientEvent),
+    Create(CaptureHandle, Position),
+    Destroy(CaptureHandle),
 }
 
 #[allow(dead_code)]
 pub struct LibeiInputCapture<'a> {
     input_capture: Pin<Box<InputCapture<'a>>>,
     libei_task: JoinHandle<Result<()>>,
-    event_rx: tokio::sync::mpsc::Receiver<(ClientHandle, Event)>,
+    event_rx: tokio::sync::mpsc::Receiver<(CaptureHandle, Event)>,
     notify_tx: tokio::sync::mpsc::Sender<ProducerEvent>,
 }
 
@@ -79,9 +80,9 @@ fn pos_to_barrier(r: &Region, pos: Position) -> (i32, i32, i32, i32) {
 
 fn select_barriers(
     zones: &Zones,
-    clients: &Vec<(ClientHandle, Position)>,
+    clients: &Vec<(CaptureHandle, Position)>,
     next_barrier_id: &mut u32,
-) -> (Vec<Barrier>, HashMap<BarrierID, ClientHandle>) {
+) -> (Vec<Barrier>, HashMap<BarrierID, CaptureHandle>) {
     let mut client_for_barrier = HashMap::new();
     let mut barriers: Vec<Barrier> = vec![];
 
@@ -105,9 +106,9 @@ fn select_barriers(
 async fn update_barriers(
     input_capture: &InputCapture<'_>,
     session: &Session<'_>,
-    active_clients: &Vec<(ClientHandle, Position)>,
+    active_clients: &Vec<(CaptureHandle, Position)>,
     next_barrier_id: &mut u32,
-) -> Result<HashMap<BarrierID, ClientHandle>> {
+) -> Result<HashMap<BarrierID, CaptureHandle>> {
     let zones = input_capture.zones(session).await?.response()?;
     log::debug!("zones: {zones:?}");
 
@@ -131,7 +132,7 @@ impl<'a> Drop for LibeiInputCapture<'a> {
 
 async fn create_session<'a>(
     input_capture: &'a InputCapture<'a>,
-) -> Result<(Session<'a>, BitFlags<Capabilities>)> {
+) -> std::result::Result<(Session<'a>, BitFlags<Capabilities>), ashpd::Error> {
     log::debug!("creating input capture session");
     let (session, capabilities) = loop {
         match input_capture
@@ -183,8 +184,8 @@ async fn connect_to_eis(
 async fn libei_event_handler(
     mut ei_event_stream: EiConvertEventStream,
     context: ei::Context,
-    event_tx: Sender<(ClientHandle, Event)>,
+    event_tx: Sender<(CaptureHandle, Event)>,
-    current_client: Rc<Cell<Option<ClientHandle>>>,
+    current_client: Rc<Cell<Option<CaptureHandle>>>,
 ) -> Result<()> {
     loop {
         let ei_event = match ei_event_stream.next().await {
@@ -200,12 +201,12 @@ async fn libei_event_handler(
 
 async fn wait_for_active_client(
     notify_rx: &mut Receiver<ProducerEvent>,
-    active_clients: &mut Vec<(ClientHandle, Position)>,
+    active_clients: &mut Vec<(CaptureHandle, Position)>,
 ) -> Result<()> {
     // wait for a client update
     while let Some(producer_event) = notify_rx.recv().await {
-        if let ProducerEvent::ClientEvent(c) = producer_event {
+        if let ProducerEvent::Create(c, p) = producer_event {
-            handle_producer_event(ProducerEvent::ClientEvent(c), active_clients)?;
+            handle_producer_event(ProducerEvent::Create(c, p), active_clients)?;
             break;
         }
     }
@@ -213,7 +214,7 @@ async fn wait_for_active_client(
 }
 
 impl<'a> LibeiInputCapture<'a> {
-    pub async fn new() -> Result<Self> {
+    pub async fn new() -> std::result::Result<Self, LibeiCaptureCreationError> {
         let input_capture = Box::pin(InputCapture::new().await?);
         let input_capture_ptr = input_capture.as_ref().get_ref() as *const InputCapture<'static>;
         let mut first_session = Some(create_session(unsafe { &*input_capture_ptr }).await?);
@@ -224,7 +225,7 @@ impl<'a> LibeiInputCapture<'a> {
             /* safety: libei_task does not outlive Self */
             let input_capture = unsafe { &*input_capture_ptr };
 
-            let mut active_clients: Vec<(ClientHandle, Position)> = vec![];
+            let mut active_clients: Vec<(CaptureHandle, Position)> = vec![];
             let mut next_barrier_id = 1u32;
 
             /* there is a bug in xdg-remote-desktop-portal-gnome / mutter that
@@ -347,8 +348,8 @@ async fn release_capture(
     input_capture: &InputCapture<'_>,
     session: &Session<'_>,
     activated: Activated,
-    current_client: ClientHandle,
+    current_client: CaptureHandle,
-    active_clients: &[(ClientHandle, Position)],
+    active_clients: &[(CaptureHandle, Position)],
 ) -> Result<()> {
     log::debug!("releasing input capture {}", activated.activation_id());
     let (x, y) = activated.cursor_position();
@@ -375,16 +376,16 @@ async fn release_capture(
 
 fn handle_producer_event(
     producer_event: ProducerEvent,
-    active_clients: &mut Vec<(ClientHandle, Position)>,
+    active_clients: &mut Vec<(CaptureHandle, Position)>,
 ) -> Result<bool> {
     log::debug!("handling event: {producer_event:?}");
     let updated = match producer_event {
         ProducerEvent::Release => false,
-        ProducerEvent::ClientEvent(ClientEvent::Create(c, p)) => {
+        ProducerEvent::Create(c, p) => {
             active_clients.push((c, p));
             true
         }
-        ProducerEvent::ClientEvent(ClientEvent::Destroy(c)) => {
+        ProducerEvent::Destroy(c) => {
             active_clients.retain(|(h, _)| *h != c);
             true
         }
@@ -394,9 +395,9 @@ fn handle_producer_event(
 
 async fn handle_ei_event(
     ei_event: EiEvent,
-    current_client: Option<ClientHandle>,
+    current_client: Option<CaptureHandle>,
     context: &ei::Context,
-    event_tx: &Sender<(ClientHandle, Event)>,
+    event_tx: &Sender<(CaptureHandle, Event)>,
 ) {
     match ei_event {
         EiEvent::SeatAdded(s) => {
@@ -545,12 +546,18 @@ async fn handle_ei_event(
 }
 
 impl<'a> LanMouseInputCapture for LibeiInputCapture<'a> {
-    fn notify(&mut self, event: ClientEvent) -> io::Result<()> {
+    fn create(&mut self, handle: super::CaptureHandle, pos: super::Position) -> io::Result<()> {
         let notify_tx = self.notify_tx.clone();
         tokio::task::spawn_local(async move {
-            log::debug!("notifying {event:?}");
+            let _ = notify_tx.send(ProducerEvent::Create(handle, pos)).await;
-            let _ = notify_tx.send(ProducerEvent::ClientEvent(event)).await;
+        });
-            log::debug!("done !");
+        Ok(())
+    }
+
+    fn destroy(&mut self, handle: super::CaptureHandle) -> io::Result<()> {
+        let notify_tx = self.notify_tx.clone();
+        tokio::task::spawn_local(async move {
+            let _ = notify_tx.send(ProducerEvent::Destroy(handle)).await;
         });
         Ok(())
     }
@@ -558,7 +565,6 @@ impl<'a> LanMouseInputCapture for LibeiInputCapture<'a> {
     fn release(&mut self) -> io::Result<()> {
         let notify_tx = self.notify_tx.clone();
         tokio::task::spawn_local(async move {
-            log::debug!("notifying Release");
             let _ = notify_tx.send(ProducerEvent::Release).await;
         });
         Ok(())
@@ -566,7 +572,7 @@ impl<'a> LanMouseInputCapture for LibeiInputCapture<'a> {
 }
 
 impl<'a> Stream for LibeiInputCapture<'a> {
-    type Item = io::Result<(ClientHandle, Event)>;
+    type Item = io::Result<(CaptureHandle, Event)>;
 
     fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
         match ready!(self.event_rx.poll_recv(cx)) {

input-capture/src/macos.rs

@@ -0,0 +1,35 @@
+use crate::{error::MacOSInputCaptureCreationError, CaptureHandle, InputCapture, Position};
+use futures_core::Stream;
+use input_event::Event;
+use std::task::{Context, Poll};
+use std::{io, pin::Pin};
+
+pub struct MacOSInputCapture;
+
+impl MacOSInputCapture {
+    pub fn new() -> std::result::Result<Self, MacOSInputCaptureCreationError> {
+        Err(MacOSInputCaptureCreationError::NotImplemented)
+    }
+}
+
+impl Stream for MacOSInputCapture {
+    type Item = io::Result<(CaptureHandle, Event)>;
+
+    fn poll_next(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
+        Poll::Pending
+    }
+}
+
+impl InputCapture for MacOSInputCapture {
+    fn create(&mut self, _id: CaptureHandle, _pos: Position) -> io::Result<()> {
+        Ok(())
+    }
+
+    fn destroy(&mut self, _id: CaptureHandle) -> io::Result<()> {
+        Ok(())
+    }
+
+    fn release(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+}

input-capture/src/wayland.rs

@@ -1,9 +1,3 @@
-use crate::{
-    capture::InputCapture,
-    client::{ClientEvent, ClientHandle, Position},
-};
-
-use anyhow::{anyhow, Result};
 use futures_core::Stream;
 use memmap::MmapOptions;
 use std::{
@@ -66,7 +60,12 @@ use wayland_client::{
 
 use tempfile;
 
-use crate::event::{Event, KeyboardEvent, PointerEvent};
+use input_event::{Event, KeyboardEvent, PointerEvent};
+
+use super::{
+    error::{LayerShellCaptureCreationError, WaylandBindError},
+    CaptureHandle, InputCapture, Position,
+};
 
 struct Globals {
     compositor: wl_compositor::WlCompositor,
@@ -103,13 +102,13 @@ struct State {
     pointer_lock: Option<ZwpLockedPointerV1>,
     rel_pointer: Option<ZwpRelativePointerV1>,
     shortcut_inhibitor: Option<ZwpKeyboardShortcutsInhibitorV1>,
-    client_for_window: Vec<(Rc<Window>, ClientHandle)>,
+    client_for_window: Vec<(Rc<Window>, CaptureHandle)>,
-    focused: Option<(Rc<Window>, ClientHandle)>,
+    focused: Option<(Rc<Window>, CaptureHandle)>,
     g: Globals,
     wayland_fd: OwnedFd,
     read_guard: Option<ReadEventsGuard>,
     qh: QueueHandle<Self>,
-    pending_events: VecDeque<(ClientHandle, Event)>,
+    pending_events: VecDeque<(CaptureHandle, Event)>,
     output_info: Vec<(WlOutput, OutputInfo)>,
     scroll_discrete_pending: bool,
 }
@@ -258,64 +257,37 @@ fn draw(f: &mut File, (width, height): (u32, u32)) {
 }
 
 impl WaylandInputCapture {
-    pub fn new() -> Result<Self> {
+    pub fn new() -> std::result::Result<Self, LayerShellCaptureCreationError> {
-        let conn = match Connection::connect_to_env() {
+        let conn = Connection::connect_to_env()?;
-            Ok(c) => c,
+        let (g, mut queue) = registry_queue_init::<State>(&conn)?;
-            Err(e) => return Err(anyhow!("could not connect to wayland compositor: {e:?}")),
-        };
-
-        let (g, mut queue) = match registry_queue_init::<State>(&conn) {
-            Ok(q) => q,
-            Err(e) => return Err(anyhow!("failed to initialize wl_registry: {e:?}")),
-        };
 
         let qh = queue.handle();
 
-        let compositor: wl_compositor::WlCompositor = match g.bind(&qh, 4..=5, ()) {
+        let compositor: wl_compositor::WlCompositor = g
-            Ok(compositor) => compositor,
+            .bind(&qh, 4..=5, ())
-            Err(_) => return Err(anyhow!("wl_compositor >= v4 not supported")),
+            .map_err(|e| WaylandBindError::new(e, "wl_compositor 4..=5"))?;
-        };
+        let xdg_output_manager: ZxdgOutputManagerV1 = g
-
+            .bind(&qh, 1..=3, ())
-        let xdg_output_manager: ZxdgOutputManagerV1 = match g.bind(&qh, 1..=3, ()) {
+            .map_err(|e| WaylandBindError::new(e, "xdg_output_manager 1..=3"))?;
-            Ok(xdg_output_manager) => xdg_output_manager,
+        let shm: wl_shm::WlShm = g
-            Err(_) => return Err(anyhow!("xdg_output not supported!")),
+            .bind(&qh, 1..=1, ())
-        };
+            .map_err(|e| WaylandBindError::new(e, "wl_shm"))?;
-
+        let layer_shell: ZwlrLayerShellV1 = g
-        let shm: wl_shm::WlShm = match g.bind(&qh, 1..=1, ()) {
+            .bind(&qh, 3..=4, ())
-            Ok(wl_shm) => wl_shm,
+            .map_err(|e| WaylandBindError::new(e, "wlr_layer_shell 3..=4"))?;
-            Err(_) => return Err(anyhow!("wl_shm v1 not supported")),
+        let seat: wl_seat::WlSeat = g
-        };
+            .bind(&qh, 7..=8, ())
-
+            .map_err(|e| WaylandBindError::new(e, "wl_seat 7..=8"))?;
-        let layer_shell: ZwlrLayerShellV1 = match g.bind(&qh, 3..=4, ()) {
-            Ok(layer_shell) => layer_shell,
-            Err(_) => return Err(anyhow!("zwlr_layer_shell_v1 >= v3 not supported - required to display a surface at the edge of the screen")),
-        };
-
-        let seat: wl_seat::WlSeat = match g.bind(&qh, 7..=8, ()) {
-            Ok(wl_seat) => wl_seat,
-            Err(_) => return Err(anyhow!("wl_seat >= v7 not supported")),
-        };
-
-        let pointer_constraints: ZwpPointerConstraintsV1 = match g.bind(&qh, 1..=1, ()) {
-            Ok(pointer_constraints) => pointer_constraints,
-            Err(_) => return Err(anyhow!("zwp_pointer_constraints_v1 not supported")),
-        };
-
-        let relative_pointer_manager: ZwpRelativePointerManagerV1 = match g.bind(&qh, 1..=1, ()) {
-            Ok(relative_pointer_manager) => relative_pointer_manager,
-            Err(_) => return Err(anyhow!("zwp_relative_pointer_manager_v1 not supported")),
-        };
-
-        let shortcut_inhibit_manager: ZwpKeyboardShortcutsInhibitManagerV1 =
-            match g.bind(&qh, 1..=1, ()) {
-                Ok(shortcut_inhibit_manager) => shortcut_inhibit_manager,
-                Err(_) => {
-                    return Err(anyhow!(
-                        "zwp_keyboard_shortcuts_inhibit_manager_v1 not supported"
-                    ))
-                }
-            };
 
+        let pointer_constraints: ZwpPointerConstraintsV1 = g
+            .bind(&qh, 1..=1, ())
+            .map_err(|e| WaylandBindError::new(e, "zwp_pointer_constraints_v1"))?;
+        let relative_pointer_manager: ZwpRelativePointerManagerV1 = g
+            .bind(&qh, 1..=1, ())
+            .map_err(|e| WaylandBindError::new(e, "zwp_relative_pointer_manager_v1"))?;
+        let shortcut_inhibit_manager: ZwpKeyboardShortcutsInhibitManagerV1 = g
+            .bind(&qh, 1..=1, ())
+            .map_err(|e| WaylandBindError::new(e, "zwp_keyboard_shortcuts_inhibit_manager_v1"))?;
         let outputs = vec![];
 
         let g = Globals {
@@ -395,11 +367,11 @@ impl WaylandInputCapture {
         Ok(WaylandInputCapture(inner))
     }
 
-    fn add_client(&mut self, handle: ClientHandle, pos: Position) {
+    fn add_client(&mut self, handle: CaptureHandle, pos: Position) {
         self.0.get_mut().state.add_client(handle, pos);
     }
 
-    fn delete_client(&mut self, handle: ClientHandle) {
+    fn delete_client(&mut self, handle: CaptureHandle) {
         let inner = self.0.get_mut();
         // remove all windows corresponding to this client
         while let Some(i) = inner
@@ -497,7 +469,7 @@ impl State {
         }
     }
 
-    fn add_client(&mut self, client: ClientHandle, pos: Position) {
+    fn add_client(&mut self, client: CaptureHandle, pos: Position) {
         let outputs = get_output_configuration(self, pos);
 
         log::debug!("outputs: {outputs:?}");
@@ -590,15 +562,13 @@ impl Inner {
 }
 
 impl InputCapture for WaylandInputCapture {
-    fn notify(&mut self, client_event: ClientEvent) -> io::Result<()> {
+    fn create(&mut self, handle: CaptureHandle, pos: Position) -> io::Result<()> {
-        match client_event {
+        self.add_client(handle, pos);
-            ClientEvent::Create(handle, pos) => {
+        let inner = self.0.get_mut();
-                self.add_client(handle, pos);
+        inner.flush_events()
-            }
+    }
-            ClientEvent::Destroy(handle) => {
+    fn destroy(&mut self, handle: CaptureHandle) -> io::Result<()> {
-                self.delete_client(handle);
+        self.delete_client(handle);
-            }
-        }
         let inner = self.0.get_mut();
         inner.flush_events()
     }
@@ -612,7 +582,7 @@ impl InputCapture for WaylandInputCapture {
 }
 
 impl Stream for WaylandInputCapture {
-    type Item = io::Result<(ClientHandle, Event)>;
+    type Item = io::Result<(CaptureHandle, Event)>;
 
     fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
         if let Some(event) = self.0.get_mut().state.pending_events.pop_front() {

input-capture/src/windows.rs

@@ -9,7 +9,7 @@ use std::ptr::{addr_of, addr_of_mut};
 use futures::executor::block_on;
 use std::default::Default;
 use std::sync::atomic::{AtomicU32, Ordering};
-use std::sync::mpsc;
+use std::sync::{mpsc, Mutex};
 use std::task::ready;
 use std::{io, pin::Pin, thread};
 use tokio::sync::mpsc::{channel, Receiver, Sender};
@@ -32,25 +32,25 @@ use windows::Win32::UI::WindowsAndMessaging::{
     WNDPROC,
 };
 
-use crate::client::Position;
+use input_event::{
-use crate::event::{
+    scancode::{self, Linux},
-    KeyboardEvent, PointerEvent, BTN_BACK, BTN_FORWARD, BTN_LEFT, BTN_MIDDLE, BTN_RIGHT,
+    Event, KeyboardEvent, PointerEvent, BTN_BACK, BTN_FORWARD, BTN_LEFT, BTN_MIDDLE, BTN_RIGHT,
-};
-use crate::scancode::Linux;
-use crate::{
-    capture::InputCapture,
-    client::{ClientEvent, ClientHandle},
-    event::Event,
-    scancode,
 };
 
+use super::{CaptureHandle, InputCapture, Position};
+
+enum Request {
+    Create(CaptureHandle, Position),
+    Destroy(CaptureHandle),
+}
+
 pub struct WindowsInputCapture {
-    event_rx: Receiver<(ClientHandle, Event)>,
+    event_rx: Receiver<(CaptureHandle, Event)>,
     msg_thread: Option<std::thread::JoinHandle<()>>,
 }
 
 enum EventType {
-    ClientEvent = 0,
+    Request = 0,
     Release = 1,
     Exit = 2,
 }
@@ -59,15 +59,28 @@ unsafe fn signal_message_thread(event_type: EventType) {
     if let Some(event_tid) = get_event_tid() {
         PostThreadMessageW(event_tid, WM_USER, WPARAM(event_type as usize), LPARAM(0)).unwrap();
     } else {
-        log::warn!("lost event");
+        panic!();
     }
 }
 
 impl InputCapture for WindowsInputCapture {
-    fn notify(&mut self, event: ClientEvent) -> io::Result<()> {
+    fn create(&mut self, handle: CaptureHandle, pos: Position) -> io::Result<()> {
         unsafe {
-            EVENT_BUFFER.push(event);
+            {
-            signal_message_thread(EventType::ClientEvent);
+                let mut requests = REQUEST_BUFFER.lock().unwrap();
+                requests.push(Request::Create(handle, pos));
+            }
+            signal_message_thread(EventType::Request);
+        }
+        Ok(())
+    }
+    fn destroy(&mut self, handle: CaptureHandle) -> io::Result<()> {
+        unsafe {
+            {
+                let mut requests = REQUEST_BUFFER.lock().unwrap();
+                requests.push(Request::Destroy(handle));
+            }
+            signal_message_thread(EventType::Request);
         }
         Ok(())
     }
@@ -78,10 +91,10 @@ impl InputCapture for WindowsInputCapture {
     }
 }
 
-static mut EVENT_BUFFER: Vec<ClientEvent> = Vec::new();
+static mut REQUEST_BUFFER: Mutex<Vec<Request>> = Mutex::new(Vec::new());
-static mut ACTIVE_CLIENT: Option<ClientHandle> = None;
+static mut ACTIVE_CLIENT: Option<CaptureHandle> = None;
-static mut CLIENT_FOR_POS: Lazy<HashMap<Position, ClientHandle>> = Lazy::new(HashMap::new);
+static mut CLIENT_FOR_POS: Lazy<HashMap<Position, CaptureHandle>> = Lazy::new(HashMap::new);
-static mut EVENT_TX: Option<Sender<(ClientHandle, Event)>> = None;
+static mut EVENT_TX: Option<Sender<(CaptureHandle, Event)>> = None;
 static mut EVENT_THREAD_ID: AtomicU32 = AtomicU32::new(0);
 unsafe fn set_event_tid(tid: u32) {
     EVENT_THREAD_ID.store(tid, Ordering::SeqCst);
@@ -96,8 +109,7 @@ unsafe fn get_event_tid() -> Option<u32> {
 static mut ENTRY_POINT: (i32, i32) = (0, 0);
 
 fn to_mouse_event(wparam: WPARAM, lparam: LPARAM) -> Option<PointerEvent> {
-    let mouse_low_level: MSLLHOOKSTRUCT =
+    let mouse_low_level: MSLLHOOKSTRUCT = unsafe { *(lparam.0 as *const MSLLHOOKSTRUCT) };
-        unsafe { *std::mem::transmute::<LPARAM, *const MSLLHOOKSTRUCT>(lparam) };
     match wparam {
         WPARAM(p) if p == WM_LBUTTONDOWN as usize => Some(PointerEvent::Button {
             time: 0,
@@ -167,8 +179,7 @@ fn to_mouse_event(wparam: WPARAM, lparam: LPARAM) -> Option<PointerEvent> {
 }
 
 unsafe fn to_key_event(wparam: WPARAM, lparam: LPARAM) -> Option<KeyboardEvent> {
-    let kybrdllhookstruct: KBDLLHOOKSTRUCT =
+    let kybrdllhookstruct: KBDLLHOOKSTRUCT = *(lparam.0 as *const KBDLLHOOKSTRUCT);
-        *std::mem::transmute::<LPARAM, *const KBDLLHOOKSTRUCT>(lparam);
     let mut scan_code = kybrdllhookstruct.scanCode;
     log::trace!("scan_code: {scan_code}");
     if kybrdllhookstruct.flags.contains(LLKHF_EXTENDED) {
@@ -247,8 +258,7 @@ unsafe fn check_client_activation(wparam: WPARAM, lparam: LPARAM) -> bool {
     if wparam.0 != WM_MOUSEMOVE as usize {
         return ACTIVE_CLIENT.is_some();
     }
-    let mouse_low_level: MSLLHOOKSTRUCT =
+    let mouse_low_level: MSLLHOOKSTRUCT = *(lparam.0 as *const MSLLHOOKSTRUCT);
-        unsafe { *std::mem::transmute::<LPARAM, *const MSLLHOOKSTRUCT>(lparam) };
     static mut PREV_POS: Option<(i32, i32)> = None;
     let curr_pos = (mouse_low_level.pt.x, mouse_low_level.pt.y);
     let prev_pos = PREV_POS.unwrap_or(curr_pos);
@@ -359,7 +369,6 @@ fn enumerate_displays() -> Vec<RECT> {
                 break;
             }
             if device.StateFlags & DISPLAY_DEVICE_ATTACHED_TO_DESKTOP != 0 {
-                log::info!("{:?}", device.DeviceName);
                 devices.push(device.DeviceName);
             }
         }
@@ -538,28 +547,37 @@ fn message_thread(ready_tx: mpsc::Sender<()>) {
                     x if x == EventType::Release as usize => {
                         ACTIVE_CLIENT.take();
                     }
-                    x if x == EventType::ClientEvent as usize => {
+                    x if x == EventType::Request as usize => {
-                        while let Some(event) = EVENT_BUFFER.pop() {
+                        let requests = {
-                            update_clients(event)
+                            let mut res = vec![];
+                            let mut requests = REQUEST_BUFFER.lock().unwrap();
+                            for request in requests.drain(..) {
+                                res.push(request);
+                            }
+                            res
+                        };
+
+                        for request in requests {
+                            update_clients(request)
                         }
                     }
                     _ => {}
                 }
             } else {
                 /* other messages for window_procs */
-                TranslateMessage(&msg);
+                let _ = TranslateMessage(&msg);
                 DispatchMessageW(&msg);
             }
         }
     }
 }
 
-fn update_clients(client_event: ClientEvent) {
+fn update_clients(request: Request) {
-    match client_event {
+    match request {
-        ClientEvent::Create(handle, pos) => {
+        Request::Create(handle, pos) => {
             unsafe { CLIENT_FOR_POS.insert(pos, handle) };
         }
-        ClientEvent::Destroy(handle) => unsafe {
+        Request::Destroy(handle) => unsafe {
             for pos in [
                 Position::Left,
                 Position::Right,
@@ -578,7 +596,7 @@ fn update_clients(client_event: ClientEvent) {
 }
 
 impl WindowsInputCapture {
-    pub(crate) fn new() -> Result<Self> {
+    pub(crate) fn new() -> Self {
         unsafe {
             let (tx, rx) = channel(10);
             EVENT_TX.replace(tx);
@@ -586,16 +604,16 @@ impl WindowsInputCapture {
             let msg_thread = Some(thread::spawn(|| message_thread(ready_tx)));
             /* wait for thread to set its id */
             ready_rx.recv().expect("channel closed");
-            Ok(Self {
+            Self {
                 msg_thread,
                 event_rx: rx,
-            })
+            }
         }
     }
 }
 
 impl Stream for WindowsInputCapture {
-    type Item = io::Result<(ClientHandle, Event)>;
+    type Item = io::Result<(CaptureHandle, Event)>;
     fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
         match ready!(self.event_rx.poll_recv(cx)) {
             None => Poll::Ready(None),

input-capture/src/x11.rs

@@ -0,0 +1,43 @@
+use std::io;
+use std::task::Poll;
+
+use futures_core::Stream;
+
+use super::InputCapture;
+use input_event::Event;
+
+use super::error::X11InputCaptureCreationError;
+use super::{CaptureHandle, Position};
+
+pub struct X11InputCapture {}
+
+impl X11InputCapture {
+    pub fn new() -> std::result::Result<Self, X11InputCaptureCreationError> {
+        Err(X11InputCaptureCreationError::NotImplemented)
+    }
+}
+
+impl InputCapture for X11InputCapture {
+    fn create(&mut self, _id: CaptureHandle, _pos: Position) -> io::Result<()> {
+        Ok(())
+    }
+
+    fn destroy(&mut self, _id: CaptureHandle) -> io::Result<()> {
+        Ok(())
+    }
+
+    fn release(&mut self) -> io::Result<()> {
+        Ok(())
+    }
+}
+
+impl Stream for X11InputCapture {
+    type Item = io::Result<(CaptureHandle, Event)>;
+
+    fn poll_next(
+        self: std::pin::Pin<&mut Self>,
+        _cx: &mut std::task::Context<'_>,
+    ) -> std::task::Poll<Option<Self::Item>> {
+        Poll::Pending
+    }
+}

input-emulation/Cargo.toml

@@ -0,0 +1,48 @@
+[package]
+name = "input-emulation"
+description = "cross-platform input emulation library used by lan-mouse"
+version = "0.1.0"
+edition = "2021"
+license = "GPL-3.0-or-later"
+repository = "https://github.com/ferdinandschober/lan-mouse"
+
+[dependencies]
+anyhow = "1.0.86"
+async-trait = "0.1.80"
+futures = "0.3.28"
+log = "0.4.22"
+input-event = { path = "../input-event", version = "0.1.0" }
+thiserror = "1.0.61"
+tokio = { version = "1.32.0", features = ["io-util", "io-std", "macros", "net", "process", "rt", "sync", "signal"] }
+once_cell = "1.19.0"
+
+[target.'cfg(all(unix, not(target_os="macos")))'.dependencies]
+wayland-client = { version="0.31.1", optional = true }
+wayland-protocols = { version="0.32.1", features=["client", "staging", "unstable"], optional = true }
+wayland-protocols-wlr = { version="0.3.1", features=["client"], optional = true }
+wayland-protocols-misc = { version="0.3.1", features=["client"], optional = true }
+x11 = { version = "2.21.0", features = ["xlib", "xtest"], optional = true }
+ashpd = { version = "0.8", default-features = false, features = ["tokio"], optional = true }
+reis = { version = "0.2", features = [ "tokio" ], optional = true }
+
+[target.'cfg(target_os="macos")'.dependencies]
+core-graphics = { version = "0.23", features = ["highsierra"] }
+keycode = "0.4.0"
+
+[target.'cfg(windows)'.dependencies]
+windows = {  version = "0.57.0", features = [
+    "Win32_System_LibraryLoader",
+    "Win32_System_Threading",
+    "Win32_Foundation",
+    "Win32_Graphics",
+    "Win32_Graphics_Gdi",
+    "Win32_UI_Input_KeyboardAndMouse",
+    "Win32_UI_WindowsAndMessaging",
+] }
+
+[features]
+default = ["wayland", "x11", "xdg_desktop_portal", "libei"]
+wayland = ["dep:wayland-client", "dep:wayland-protocols", "dep:wayland-protocols-wlr", "dep:wayland-protocols-misc" ]
+x11 = ["dep:x11"]
+xdg_desktop_portal = ["dep:ashpd"]
+libei = ["dep:reis", "dep:ashpd"]

input-emulation/src/dummy.rs

@@ -0,0 +1,29 @@
+use async_trait::async_trait;
+use input_event::Event;
+
+use crate::error::EmulationError;
+
+use super::{EmulationHandle, InputEmulation};
+
+#[derive(Default)]
+pub struct DummyEmulation;
+
+impl DummyEmulation {
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+#[async_trait]
+impl InputEmulation for DummyEmulation {
+    async fn consume(
+        &mut self,
+        event: Event,
+        client_handle: EmulationHandle,
+    ) -> Result<(), EmulationError> {
+        log::info!("received event: ({client_handle}) {event}");
+        Ok(())
+    }
+    async fn create(&mut self, _: EmulationHandle) {}
+    async fn destroy(&mut self, _: EmulationHandle) {}
+}

input-emulation/src/error.rs

@@ -0,0 +1,192 @@
+use std::{fmt::Display, io};
+
+use thiserror::Error;
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+use wayland_client::{
+    backend::WaylandError,
+    globals::{BindError, GlobalError},
+    ConnectError, DispatchError,
+};
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+use reis::tokio::HandshakeError;
+
+#[derive(Debug, Error)]
+pub enum EmulationError {
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    #[error("libei error flushing events: `{0}`")]
+    Libei(#[from] reis::event::Error),
+    #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+    #[error("wayland error: `{0}`")]
+    Wayland(#[from] wayland_client::backend::WaylandError),
+    #[cfg(all(
+        unix,
+        any(feature = "xdg_desktop_portal", feature = "libei"),
+        not(target_os = "macos")
+    ))]
+    #[error("xdg-desktop-portal: `{0}`")]
+    Ashpd(#[from] ashpd::Error),
+    #[error("io error: `{0}`")]
+    Io(#[from] io::Error),
+}
+
+#[derive(Debug, Error)]
+pub enum EmulationCreationError {
+    #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+    Wlroots(#[from] WlrootsEmulationCreationError),
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    Libei(#[from] LibeiEmulationCreationError),
+    #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+    Xdp(#[from] XdpEmulationCreationError),
+    #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+    X11(#[from] X11EmulationCreationError),
+    #[cfg(target_os = "macos")]
+    MacOs(#[from] MacOSEmulationCreationError),
+    #[cfg(windows)]
+    Windows(#[from] WindowsEmulationCreationError),
+    NoAvailableBackend,
+}
+
+impl Display for EmulationCreationError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let reason = match self {
+            #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+            EmulationCreationError::Wlroots(e) => format!("wlroots backend: {e}"),
+            #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+            EmulationCreationError::Libei(e) => format!("libei backend: {e}"),
+            #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+            EmulationCreationError::Xdp(e) => format!("desktop portal backend: {e}"),
+            #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+            EmulationCreationError::X11(e) => format!("x11 backend: {e}"),
+            #[cfg(target_os = "macos")]
+            EmulationCreationError::MacOs(e) => format!("macos backend: {e}"),
+            #[cfg(windows)]
+            EmulationCreationError::Windows(e) => format!("windows backend: {e}"),
+            EmulationCreationError::NoAvailableBackend => "no backend available".to_string(),
+        };
+        write!(f, "could not create input emulation backend: {reason}")
+    }
+}
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum WlrootsEmulationCreationError {
+    Connect(#[from] ConnectError),
+    Global(#[from] GlobalError),
+    Wayland(#[from] WaylandError),
+    Bind(#[from] WaylandBindError),
+    Dispatch(#[from] DispatchError),
+    Io(#[from] std::io::Error),
+}
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub struct WaylandBindError {
+    inner: BindError,
+    protocol: &'static str,
+}
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+impl WaylandBindError {
+    pub(crate) fn new(inner: BindError, protocol: &'static str) -> Self {
+        Self { inner, protocol }
+    }
+}
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+impl Display for WaylandBindError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "{} protocol not supported: {}",
+            self.protocol, self.inner
+        )
+    }
+}
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+impl Display for WlrootsEmulationCreationError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            WlrootsEmulationCreationError::Bind(e) => write!(f, "{e}"),
+            WlrootsEmulationCreationError::Connect(e) => {
+                write!(f, "could not connect to wayland compositor: {e}")
+            }
+            WlrootsEmulationCreationError::Global(e) => write!(f, "wayland error: {e}"),
+            WlrootsEmulationCreationError::Wayland(e) => write!(f, "wayland error: {e}"),
+            WlrootsEmulationCreationError::Dispatch(e) => {
+                write!(f, "error dispatching wayland events: {e}")
+            }
+            WlrootsEmulationCreationError::Io(e) => write!(f, "io error: {e}"),
+        }
+    }
+}
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum LibeiEmulationCreationError {
+    Ashpd(#[from] ashpd::Error),
+    Io(#[from] std::io::Error),
+    Handshake(#[from] HandshakeError),
+}
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+impl Display for LibeiEmulationCreationError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            LibeiEmulationCreationError::Ashpd(e) => write!(f, "xdg-desktop-portal: {e}"),
+            LibeiEmulationCreationError::Io(e) => write!(f, "io error: {e}"),
+            LibeiEmulationCreationError::Handshake(e) => write!(f, "error in libei handshake: {e}"),
+        }
+    }
+}
+
+#[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum XdpEmulationCreationError {
+    Ashpd(#[from] ashpd::Error),
+}
+
+#[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+impl Display for XdpEmulationCreationError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            XdpEmulationCreationError::Ashpd(e) => write!(f, "portal error: {e}"),
+        }
+    }
+}
+
+#[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum X11EmulationCreationError {
+    OpenDisplay,
+}
+
+#[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+impl Display for X11EmulationCreationError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            X11EmulationCreationError::OpenDisplay => write!(f, "could not open display!"),
+        }
+    }
+}
+
+#[cfg(target_os = "macos")]
+#[derive(Debug, Error)]
+pub enum MacOSEmulationCreationError {
+    EventSourceCreation,
+}
+
+#[cfg(target_os = "macos")]
+impl Display for MacOSEmulationCreationError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            MacOSEmulationCreationError::EventSourceCreation => {
+                write!(f, "could not create event source")
+            }
+        }
+    }
+}
+
+#[cfg(windows)]
+#[derive(Debug, Error)]
+pub enum WindowsEmulationCreationError {}

input-emulation/src/lib.rs

@@ -0,0 +1,141 @@
+use async_trait::async_trait;
+use error::EmulationError;
+use std::fmt::Display;
+
+use input_event::Event;
+
+use anyhow::Result;
+
+use self::error::EmulationCreationError;
+
+#[cfg(windows)]
+pub mod windows;
+
+#[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+pub mod x11;
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+pub mod wlroots;
+
+#[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+pub mod xdg_desktop_portal;
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+pub mod libei;
+
+#[cfg(target_os = "macos")]
+pub mod macos;
+
+/// fallback input emulation (logs events)
+pub mod dummy;
+pub mod error;
+
+pub type EmulationHandle = u64;
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub enum Backend {
+    #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+    Wlroots,
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    Libei,
+    #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+    Xdp,
+    #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+    X11,
+    #[cfg(windows)]
+    Windows,
+    #[cfg(target_os = "macos")]
+    MacOs,
+    Dummy,
+}
+
+impl Display for Backend {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+            Backend::Wlroots => write!(f, "wlroots"),
+            #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+            Backend::Libei => write!(f, "libei"),
+            #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+            Backend::Xdp => write!(f, "xdg-desktop-portal"),
+            #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+            Backend::X11 => write!(f, "X11"),
+            #[cfg(windows)]
+            Backend::Windows => write!(f, "windows"),
+            #[cfg(target_os = "macos")]
+            Backend::MacOs => write!(f, "macos"),
+            Backend::Dummy => write!(f, "dummy"),
+        }
+    }
+}
+
+#[async_trait]
+pub trait InputEmulation: Send {
+    async fn consume(
+        &mut self,
+        event: Event,
+        handle: EmulationHandle,
+    ) -> Result<(), EmulationError>;
+    async fn create(&mut self, handle: EmulationHandle);
+    async fn destroy(&mut self, handle: EmulationHandle);
+}
+
+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) => log::warn!("{e}"),
+        }
+    }
+
+    Err(EmulationCreationError::NoAvailableBackend)
+}

input-emulation/src/libei.rs

@@ -0,0 +1,336 @@
+use anyhow::{anyhow, Result};
+use futures::StreamExt;
+use once_cell::sync::Lazy;
+use std::{
+    collections::HashMap,
+    io,
+    os::{fd::OwnedFd, unix::net::UnixStream},
+    sync::{
+        atomic::{AtomicU32, Ordering},
+        Arc, RwLock,
+    },
+    time::{SystemTime, UNIX_EPOCH},
+};
+use tokio::task::JoinHandle;
+
+use ashpd::{
+    desktop::{
+        remote_desktop::{DeviceType, RemoteDesktop},
+        ResponseError,
+    },
+    WindowIdentifier,
+};
+use async_trait::async_trait;
+
+use reis::{
+    ei::{
+        self, button::ButtonState, handshake::ContextType, keyboard::KeyState, Button, Keyboard,
+        Pointer, Scroll,
+    },
+    event::{DeviceCapability, DeviceEvent, EiEvent, SeatEvent},
+    tokio::{ei_handshake, EiConvertEventStream, EiEventStream},
+};
+
+use input_event::{Event, KeyboardEvent, PointerEvent};
+
+use crate::error::EmulationError;
+
+use super::{error::LibeiEmulationCreationError, EmulationHandle, InputEmulation};
+
+static INTERFACES: Lazy<HashMap<&'static str, u32>> = Lazy::new(|| {
+    let mut m = HashMap::new();
+    m.insert("ei_connection", 1);
+    m.insert("ei_callback", 1);
+    m.insert("ei_pingpong", 1);
+    m.insert("ei_seat", 1);
+    m.insert("ei_device", 2);
+    m.insert("ei_pointer", 1);
+    m.insert("ei_pointer_absolute", 1);
+    m.insert("ei_scroll", 1);
+    m.insert("ei_button", 1);
+    m.insert("ei_keyboard", 1);
+    m.insert("ei_touchscreen", 1);
+    m
+});
+
+#[derive(Clone, Default)]
+struct Devices {
+    pointer: Arc<RwLock<Option<(ei::Device, ei::Pointer)>>>,
+    scroll: Arc<RwLock<Option<(ei::Device, ei::Scroll)>>>,
+    button: Arc<RwLock<Option<(ei::Device, ei::Button)>>>,
+    keyboard: Arc<RwLock<Option<(ei::Device, ei::Keyboard)>>>,
+}
+
+pub struct LibeiEmulation {
+    context: ei::Context,
+    devices: Devices,
+    serial: AtomicU32,
+    ei_task: JoinHandle<Result<()>>,
+}
+
+async fn get_ei_fd() -> Result<OwnedFd, ashpd::Error> {
+    let proxy = RemoteDesktop::new().await?;
+
+    // retry when user presses the cancel button
+    let (session, _) = loop {
+        log::debug!("creating session ...");
+        let session = proxy.create_session().await?;
+
+        log::debug!("selecting devices ...");
+        proxy
+            .select_devices(&session, DeviceType::Keyboard | DeviceType::Pointer)
+            .await?;
+
+        log::info!("requesting permission for input emulation");
+        match proxy
+            .start(&session, &WindowIdentifier::default())
+            .await?
+            .response()
+        {
+            Ok(d) => break (session, d),
+            Err(ashpd::Error::Response(ResponseError::Cancelled)) => {
+                log::warn!("request cancelled!");
+                continue;
+            }
+            e => e?,
+        };
+    };
+
+    proxy.connect_to_eis(&session).await
+}
+
+impl LibeiEmulation {
+    pub async fn new() -> Result<Self, LibeiEmulationCreationError> {
+        let eifd = get_ei_fd().await?;
+        let stream = UnixStream::from(eifd);
+        stream.set_nonblocking(true)?;
+        let context = ei::Context::new(stream)?;
+        context.flush().map_err(|e| io::Error::new(e.kind(), e))?;
+        let mut events = EiEventStream::new(context.clone())?;
+        let handshake = ei_handshake(
+            &mut events,
+            "de.feschber.LanMouse",
+            ContextType::Sender,
+            &INTERFACES,
+        )
+        .await?;
+        let events = EiConvertEventStream::new(events, handshake.serial);
+        let devices = Devices::default();
+        let ei_task =
+            tokio::task::spawn_local(ei_event_handler(events, context.clone(), devices.clone()));
+
+        let serial = AtomicU32::new(handshake.serial);
+
+        Ok(Self {
+            serial,
+            context,
+            ei_task,
+            devices,
+        })
+    }
+}
+
+impl Drop for LibeiEmulation {
+    fn drop(&mut self) {
+        self.ei_task.abort();
+    }
+}
+
+#[async_trait]
+impl InputEmulation for LibeiEmulation {
+    async fn consume(
+        &mut self,
+        event: Event,
+        _handle: EmulationHandle,
+    ) -> Result<(), EmulationError> {
+        let now = SystemTime::now()
+            .duration_since(UNIX_EPOCH)
+            .unwrap()
+            .as_micros() as u64;
+        match event {
+            Event::Pointer(p) => match p {
+                PointerEvent::Motion {
+                    time: _,
+                    relative_x,
+                    relative_y,
+                } => {
+                    let pointer_device = self.devices.pointer.read().unwrap();
+                    if let Some((d, p)) = pointer_device.as_ref() {
+                        p.motion_relative(relative_x as f32, relative_y as f32);
+                        d.frame(self.serial.load(Ordering::SeqCst), now);
+                    }
+                }
+                PointerEvent::Button {
+                    time: _,
+                    button,
+                    state,
+                } => {
+                    let button_device = self.devices.button.read().unwrap();
+                    if let Some((d, b)) = button_device.as_ref() {
+                        b.button(
+                            button,
+                            match state {
+                                0 => ButtonState::Released,
+                                _ => ButtonState::Press,
+                            },
+                        );
+                        d.frame(self.serial.load(Ordering::SeqCst), now);
+                    }
+                }
+                PointerEvent::Axis {
+                    time: _,
+                    axis,
+                    value,
+                } => {
+                    let scroll_device = self.devices.scroll.read().unwrap();
+                    if let Some((d, s)) = scroll_device.as_ref() {
+                        match axis {
+                            0 => s.scroll(0., value as f32),
+                            _ => s.scroll(value as f32, 0.),
+                        }
+                        d.frame(self.serial.load(Ordering::SeqCst), now);
+                    }
+                }
+                PointerEvent::AxisDiscrete120 { axis, value } => {
+                    let scroll_device = self.devices.scroll.read().unwrap();
+                    if let Some((d, s)) = scroll_device.as_ref() {
+                        match axis {
+                            0 => s.scroll_discrete(0, value),
+                            _ => s.scroll_discrete(value, 0),
+                        }
+                        d.frame(self.serial.load(Ordering::SeqCst), now);
+                    }
+                }
+                PointerEvent::Frame {} => {}
+            },
+            Event::Keyboard(k) => match k {
+                KeyboardEvent::Key {
+                    time: _,
+                    key,
+                    state,
+                } => {
+                    let keyboard_device = self.devices.keyboard.read().unwrap();
+                    if let Some((d, k)) = keyboard_device.as_ref() {
+                        k.key(
+                            key,
+                            match state {
+                                0 => KeyState::Released,
+                                _ => KeyState::Press,
+                            },
+                        );
+                        d.frame(self.serial.load(Ordering::SeqCst), now);
+                    }
+                }
+                KeyboardEvent::Modifiers { .. } => {}
+            },
+            _ => {}
+        }
+        self.context
+            .flush()
+            .map_err(|e| io::Error::new(e.kind(), e))?;
+        Ok(())
+    }
+
+    async fn create(&mut self, _: EmulationHandle) {}
+    async fn destroy(&mut self, _: EmulationHandle) {}
+}
+
+async fn ei_event_handler(
+    mut events: EiConvertEventStream,
+    context: ei::Context,
+    devices: Devices,
+) -> Result<()> {
+    loop {
+        let event = events
+            .next()
+            .await
+            .ok_or(anyhow!("ei stream closed"))?
+            .map_err(|e| anyhow!("libei error: {e:?}"))?;
+        const CAPABILITIES: &[DeviceCapability] = &[
+            DeviceCapability::Pointer,
+            DeviceCapability::PointerAbsolute,
+            DeviceCapability::Keyboard,
+            DeviceCapability::Touch,
+            DeviceCapability::Scroll,
+            DeviceCapability::Button,
+        ];
+        log::debug!("{event:?}");
+        match event {
+            EiEvent::Disconnected(e) => {
+                log::debug!("ei disconnected: {e:?}");
+                break;
+            }
+            EiEvent::SeatAdded(e) => {
+                e.seat().bind_capabilities(CAPABILITIES);
+            }
+            EiEvent::SeatRemoved(e) => {
+                log::debug!("seat removed: {:?}", e.seat());
+            }
+            EiEvent::DeviceAdded(e) => {
+                let device_type = e.device().device_type();
+                log::debug!("device added: {device_type:?}");
+                e.device().device();
+                let device = e.device();
+                if let Some(pointer) = e.device().interface::<Pointer>() {
+                    devices
+                        .pointer
+                        .write()
+                        .unwrap()
+                        .replace((device.device().clone(), pointer));
+                }
+                if let Some(keyboard) = e.device().interface::<Keyboard>() {
+                    devices
+                        .keyboard
+                        .write()
+                        .unwrap()
+                        .replace((device.device().clone(), keyboard));
+                }
+                if let Some(scroll) = e.device().interface::<Scroll>() {
+                    devices
+                        .scroll
+                        .write()
+                        .unwrap()
+                        .replace((device.device().clone(), scroll));
+                }
+                if let Some(button) = e.device().interface::<Button>() {
+                    devices
+                        .button
+                        .write()
+                        .unwrap()
+                        .replace((device.device().clone(), button));
+                }
+            }
+            EiEvent::DeviceRemoved(e) => {
+                log::debug!("device removed: {:?}", e.device().device_type());
+            }
+            EiEvent::DevicePaused(e) => {
+                log::debug!("device paused: {:?}", e.device().device_type());
+            }
+            EiEvent::DeviceResumed(e) => {
+                log::debug!("device resumed: {:?}", e.device().device_type());
+                e.device().device().start_emulating(0, 0);
+            }
+            EiEvent::KeyboardModifiers(e) => {
+                log::debug!("modifiers: {e:?}");
+            }
+            // only for receiver context
+            // EiEvent::Frame(_) => { },
+            // EiEvent::DeviceStartEmulating(_) => { },
+            // EiEvent::DeviceStopEmulating(_) => { },
+            // EiEvent::PointerMotion(_) => { },
+            // EiEvent::PointerMotionAbsolute(_) => { },
+            // EiEvent::Button(_) => { },
+            // EiEvent::ScrollDelta(_) => { },
+            // EiEvent::ScrollStop(_) => { },
+            // EiEvent::ScrollCancel(_) => { },
+            // EiEvent::ScrollDiscrete(_) => { },
+            // EiEvent::KeyboardKey(_) => { },
+            // EiEvent::TouchDown(_) => { },
+            // EiEvent::TouchUp(_) => { },
+            // EiEvent::TouchMotion(_) => { },
+            _ => unreachable!("unexpected ei event"),
+        }
+        context.flush()?;
+    }
+    Ok(())
+}

input-emulation/src/macos.rs

@@ -1,18 +1,18 @@
-use crate::client::{ClientEvent, ClientHandle};
+use super::{error::EmulationError, EmulationHandle, InputEmulation};
-use crate::emulate::InputEmulation;
-use crate::event::{Event, KeyboardEvent, PointerEvent};
-use anyhow::{anyhow, Result};
 use async_trait::async_trait;
 use core_graphics::display::{CGDisplayBounds, CGMainDisplayID, CGPoint};
 use core_graphics::event::{
     CGEvent, CGEventTapLocation, CGEventType, CGKeyCode, CGMouseButton, EventField, ScrollEventUnit,
 };
 use core_graphics::event_source::{CGEventSource, CGEventSourceStateID};
+use input_event::{Event, KeyboardEvent, PointerEvent};
 use keycode::{KeyMap, KeyMapping};
 use std::ops::{Index, IndexMut};
 use std::time::Duration;
 use tokio::task::AbortHandle;
 
+use super::error::MacOSEmulationCreationError;
+
 const DEFAULT_REPEAT_DELAY: Duration = Duration::from_millis(500);
 const DEFAULT_REPEAT_INTERVAL: Duration = Duration::from_millis(32);
 
@@ -53,11 +53,9 @@ impl IndexMut<CGMouseButton> for ButtonState {
 unsafe impl Send for MacOSEmulation {}
 
 impl MacOSEmulation {
-    pub fn new() -> Result<Self> {
+    pub fn new() -> Result<Self, MacOSEmulationCreationError> {
-        let event_source = match CGEventSource::new(CGEventSourceStateID::CombinedSessionState) {
+        let event_source = CGEventSource::new(CGEventSourceStateID::CombinedSessionState)
-            Ok(e) => e,
+            .map_err(|_| MacOSEmulationCreationError::EventSourceCreation)?;
-            Err(_) => return Err(anyhow!("event source creation failed!")),
-        };
         let button_state = ButtonState {
             left: false,
             right: false,
@@ -109,7 +107,11 @@ fn key_event(event_source: CGEventSource, key: u16, state: u8) {
 
 #[async_trait]
 impl InputEmulation for MacOSEmulation {
-    async fn consume(&mut self, event: Event, _client_handle: ClientHandle) {
+    async fn consume(
+        &mut self,
+        event: Event,
+        _handle: EmulationHandle,
+    ) -> Result<(), EmulationError> {
         match event {
             Event::Pointer(pointer_event) => match pointer_event {
                 PointerEvent::Motion {
@@ -131,7 +133,7 @@ impl InputEmulation for MacOSEmulation {
                         Some(l) => l,
                         None => {
                             log::warn!("could not get mouse location!");
-                            return;
+                            return Ok(());
                         }
                     };
 
@@ -155,7 +157,7 @@ impl InputEmulation for MacOSEmulation {
                         Ok(e) => e,
                         Err(_) => {
                             log::warn!("mouse event creation failed!");
-                            return;
+                            return Ok(());
                         }
                     };
                     event.set_integer_value_field(
@@ -174,27 +176,27 @@ impl InputEmulation for MacOSEmulation {
                     state,
                 } => {
                     let (event_type, mouse_button) = match (button, state) {
-                        (b, 1) if b == crate::event::BTN_LEFT => {
+                        (b, 1) if b == input_event::BTN_LEFT => {
                             (CGEventType::LeftMouseDown, CGMouseButton::Left)
                         }
-                        (b, 0) if b == crate::event::BTN_LEFT => {
+                        (b, 0) if b == input_event::BTN_LEFT => {
                             (CGEventType::LeftMouseUp, CGMouseButton::Left)
                         }
-                        (b, 1) if b == crate::event::BTN_RIGHT => {
+                        (b, 1) if b == input_event::BTN_RIGHT => {
                             (CGEventType::RightMouseDown, CGMouseButton::Right)
                         }
-                        (b, 0) if b == crate::event::BTN_RIGHT => {
+                        (b, 0) if b == input_event::BTN_RIGHT => {
                             (CGEventType::RightMouseUp, CGMouseButton::Right)
                         }
-                        (b, 1) if b == crate::event::BTN_MIDDLE => {
+                        (b, 1) if b == input_event::BTN_MIDDLE => {
                             (CGEventType::OtherMouseDown, CGMouseButton::Center)
                         }
-                        (b, 0) if b == crate::event::BTN_MIDDLE => {
+                        (b, 0) if b == input_event::BTN_MIDDLE => {
                             (CGEventType::OtherMouseUp, CGMouseButton::Center)
                         }
                         _ => {
                             log::warn!("invalid button event: {button},{state}");
-                            return;
+                            return Ok(());
                         }
                     };
                     // store button state
@@ -210,7 +212,7 @@ impl InputEmulation for MacOSEmulation {
                         Ok(e) => e,
                         Err(()) => {
                             log::warn!("mouse event creation failed!");
-                            return;
+                            return Ok(());
                         }
                     };
                     event.post(CGEventTapLocation::HID);
@@ -226,7 +228,7 @@ impl InputEmulation for MacOSEmulation {
                         1 => (2, 0, value, 0), // 1 = horizontal => 2 scroll wheel devices (y, x) -> (0, x)
                         _ => {
                             log::warn!("invalid scroll event: {axis}, {value}");
-                            return;
+                            return Ok(());
                         }
                     };
                     let event = match CGEvent::new_scroll_event(
@@ -240,7 +242,7 @@ impl InputEmulation for MacOSEmulation {
                         Ok(e) => e,
                         Err(()) => {
                             log::warn!("scroll event creation failed!");
-                            return;
+                            return Ok(());
                         }
                     };
                     event.post(CGEventTapLocation::HID);
@@ -251,7 +253,7 @@ impl InputEmulation for MacOSEmulation {
                         1 => (2, 0, value, 0), // 1 = horizontal => 2 scroll wheel devices (y, x) -> (0, x)
                         _ => {
                             log::warn!("invalid scroll event: {axis}, {value}");
-                            return;
+                            return Ok(());
                         }
                     };
                     let event = match CGEvent::new_scroll_event(
@@ -265,7 +267,7 @@ impl InputEmulation for MacOSEmulation {
                         Ok(e) => e,
                         Err(()) => {
                             log::warn!("scroll event creation failed!");
-                            return;
+                            return Ok(());
                         }
                     };
                     event.post(CGEventTapLocation::HID);
@@ -282,7 +284,7 @@ impl InputEmulation for MacOSEmulation {
                         Ok(k) => k.mac as CGKeyCode,
                         Err(_) => {
                             log::warn!("unable to map key event");
-                            return;
+                            return Ok(());
                         }
                     };
                     match state {
@@ -296,9 +298,11 @@ impl InputEmulation for MacOSEmulation {
             },
             _ => (),
         }
+        // FIXME
+        Ok(())
     }
 
-    async fn notify(&mut self, _client_event: ClientEvent) {}
+    async fn create(&mut self, _handle: EmulationHandle) {}
 
-    async fn destroy(&mut self) {}
+    async fn destroy(&mut self, _handle: EmulationHandle) {}
 }

input-emulation/src/windows.rs

@@ -1,9 +1,9 @@
-use crate::{
+use super::error::{EmulationError, WindowsEmulationCreationError};
-    emulate::InputEmulation,
+use input_event::{
-    event::{KeyboardEvent, PointerEvent},
+    scancode, Event, KeyboardEvent, PointerEvent, BTN_BACK, BTN_FORWARD, BTN_LEFT, BTN_MIDDLE,
-    scancode,
+    BTN_RIGHT,
 };
-use anyhow::Result;
+
 use async_trait::async_trait;
 use std::ops::BitOrAssign;
 use std::time::Duration;
@@ -19,11 +19,7 @@ use windows::Win32::UI::Input::KeyboardAndMouse::{
 };
 use windows::Win32::UI::WindowsAndMessaging::{XBUTTON1, XBUTTON2};
 
-use crate::event::{BTN_BACK, BTN_FORWARD, BTN_LEFT, BTN_MIDDLE, BTN_RIGHT};
+use super::{EmulationHandle, InputEmulation};
-use crate::{
-    client::{ClientEvent, ClientHandle},
-    event::Event,
-};
 
 const DEFAULT_REPEAT_DELAY: Duration = Duration::from_millis(500);
 const DEFAULT_REPEAT_INTERVAL: Duration = Duration::from_millis(32);
@@ -33,14 +29,14 @@ pub struct WindowsEmulation {
 }
 
 impl WindowsEmulation {
-    pub fn new() -> Result<Self> {
+    pub fn new() -> Result<Self, WindowsEmulationCreationError> {
         Ok(Self { repeat_task: None })
     }
 }
 
 #[async_trait]
 impl InputEmulation for WindowsEmulation {
-    async fn consume(&mut self, event: Event, _: ClientHandle) {
+    async fn consume(&mut self, event: Event, _: EmulationHandle) -> Result<(), EmulationError> {
         match event {
             Event::Pointer(pointer_event) => match pointer_event {
                 PointerEvent::Motion {
@@ -81,13 +77,13 @@ impl InputEmulation for WindowsEmulation {
             },
             _ => {}
         }
+        // FIXME
+        Ok(())
     }
 
-    async fn notify(&mut self, _: ClientEvent) {
+    async fn create(&mut self, _handle: EmulationHandle) {}
-        // nothing to do
-    }
 
-    async fn destroy(&mut self) {}
+    async fn destroy(&mut self, _handle: EmulationHandle) {}
 }
 
 impl WindowsEmulation {

input-emulation/src/wlroots.rs

@@ -1,5 +1,6 @@
-use crate::client::{ClientEvent, ClientHandle};
+use crate::error::EmulationError;
-use crate::emulate::InputEmulation;
+
+use super::{error::WlrootsEmulationCreationError, InputEmulation};
 use async_trait::async_trait;
 use std::collections::HashMap;
 use std::io;
@@ -7,7 +8,6 @@ use std::os::fd::{AsFd, OwnedFd};
 use wayland_client::backend::WaylandError;
 use wayland_client::WEnum;
 
-use anyhow::{anyhow, Result};
 use wayland_client::protocol::wl_keyboard::{self, WlKeyboard};
 use wayland_client::protocol::wl_pointer::{Axis, ButtonState};
 use wayland_client::protocol::wl_seat::WlSeat;
@@ -28,11 +28,14 @@ use wayland_client::{
     Connection, Dispatch, EventQueue, QueueHandle,
 };
 
-use crate::event::{Event, KeyboardEvent, PointerEvent};
+use input_event::{Event, KeyboardEvent, PointerEvent};
+
+use super::error::WaylandBindError;
+use super::EmulationHandle;
 
 struct State {
     keymap: Option<(u32, OwnedFd, u32)>,
-    input_for_client: HashMap<ClientHandle, VirtualInput>,
+    input_for_client: HashMap<EmulationHandle, VirtualInput>,
     seat: wl_seat::WlSeat,
     qh: QueueHandle<Self>,
     vpm: VpManager,
@@ -47,20 +50,23 @@ pub(crate) struct WlrootsEmulation {
 }
 
 impl WlrootsEmulation {
-    pub fn new() -> Result<Self> {
+    pub fn new() -> Result<Self, WlrootsEmulationCreationError> {
         let conn = Connection::connect_to_env()?;
         let (globals, queue) = registry_queue_init::<State>(&conn)?;
         let qh = queue.handle();
 
-        let seat: wl_seat::WlSeat = match globals.bind(&qh, 7..=8, ()) {
+        let seat: wl_seat::WlSeat = globals
-            Ok(wl_seat) => wl_seat,
+            .bind(&qh, 7..=8, ())
-            Err(_) => return Err(anyhow!("wl_seat >= v7 not supported")),
+            .map_err(|e| WaylandBindError::new(e, "wl_seat 7..=8"))?;
-        };
 
-        let vpm: VpManager = globals.bind(&qh, 1..=1, ())?;
+        let vpm: VpManager = globals
-        let vkm: VkManager = globals.bind(&qh, 1..=1, ())?;
+            .bind(&qh, 1..=1, ())
+            .map_err(|e| WaylandBindError::new(e, "wlr-virtual-pointer-unstable-v1"))?;
+        let vkm: VkManager = globals
+            .bind(&qh, 1..=1, ())
+            .map_err(|e| WaylandBindError::new(e, "virtual-keyboard-unstable-v1"))?;
 
-        let input_for_client: HashMap<ClientHandle, VirtualInput> = HashMap::new();
+        let input_for_client: HashMap<EmulationHandle, VirtualInput> = HashMap::new();
 
         let mut emulate = WlrootsEmulation {
             last_flush_failed: false,
@@ -75,7 +81,7 @@ impl WlrootsEmulation {
             queue,
         };
         while emulate.state.keymap.is_none() {
-            emulate.queue.blocking_dispatch(&mut emulate.state).unwrap();
+            emulate.queue.blocking_dispatch(&mut emulate.state)?;
         }
         // let fd = unsafe { &File::from_raw_fd(emulate.state.keymap.unwrap().1.as_raw_fd()) };
         // let mmap = unsafe { MmapOptions::new().map_copy(fd).unwrap() };
@@ -85,7 +91,7 @@ impl WlrootsEmulation {
 }
 
 impl State {
-    fn add_client(&mut self, client: ClientHandle) {
+    fn add_client(&mut self, client: EmulationHandle) {
         let pointer: Vp = self.vpm.create_virtual_pointer(None, &self.qh, ());
         let keyboard: Vk = self.vkm.create_virtual_keyboard(&self.seat, &self.qh, ());
 
@@ -100,56 +106,65 @@ impl State {
 
         self.input_for_client.insert(client, vinput);
     }
+
+    fn destroy_client(&mut self, handle: EmulationHandle) {
+        if let Some(input) = self.input_for_client.remove(&handle) {
+            input.pointer.destroy();
+            input.keyboard.destroy();
+        }
+    }
 }
 
 #[async_trait]
 impl InputEmulation for WlrootsEmulation {
-    async fn consume(&mut self, event: Event, client_handle: ClientHandle) {
+    async fn consume(
-        if let Some(virtual_input) = self.state.input_for_client.get(&client_handle) {
+        &mut self,
+        event: Event,
+        handle: EmulationHandle,
+    ) -> Result<(), EmulationError> {
+        if let Some(virtual_input) = self.state.input_for_client.get(&handle) {
             if self.last_flush_failed {
-                if let Err(WaylandError::Io(e)) = self.queue.flush() {
+                match self.queue.flush() {
-                    if e.kind() == io::ErrorKind::WouldBlock {
+                    Err(WaylandError::Io(e)) if e.kind() == io::ErrorKind::WouldBlock => {
                         /*
                          * outgoing buffer is full - sending more events
                          * will overwhelm the output buffer and leave the
                          * wayland connection in a broken state
                          */
-                        log::warn!(
+                        log::warn!("can't keep up, discarding event: ({handle}) - {event:?}");
-                            "can't keep up, discarding event: ({client_handle}) - {event:?}"
+                        return Ok(());
-                        );
-                        return;
                     }
+                    _ => {}
                 }
             }
-            virtual_input.consume_event(event).unwrap();
+            virtual_input
+                .consume_event(event)
+                .unwrap_or_else(|_| panic!("failed to convert event: {event:?}"));
             match self.queue.flush() {
                 Err(WaylandError::Io(e)) if e.kind() == io::ErrorKind::WouldBlock => {
                     self.last_flush_failed = true;
-                    log::warn!("can't keep up, retrying ...");
+                    log::warn!("can't keep up, discarding event: ({handle}) - {event:?}");
-                }
-                Err(WaylandError::Io(e)) => {
-                    log::error!("{e}")
-                }
-                Err(WaylandError::Protocol(e)) => {
-                    panic!("wayland protocol violation: {e}")
-                }
-                Ok(()) => {
-                    self.last_flush_failed = false;
                 }
+                Err(WaylandError::Protocol(e)) => panic!("wayland protocol violation: {e}"),
+                Ok(()) => self.last_flush_failed = false,
+                Err(e) => Err(e)?,
             }
         }
+        Ok(())
     }
 
-    async fn notify(&mut self, client_event: ClientEvent) {
+    async fn create(&mut self, handle: EmulationHandle) {
-        if let ClientEvent::Create(client, _) = client_event {
+        self.state.add_client(handle);
-            self.state.add_client(client);
+        if let Err(e) = self.queue.flush() {
-            if let Err(e) = self.queue.flush() {
+            log::error!("{}", e);
-                log::error!("{}", e);
+        }
-            }
+    }
+    async fn destroy(&mut self, handle: EmulationHandle) {
+        self.state.destroy_client(handle);
+        if let Err(e) = self.queue.flush() {
+            log::error!("{}", e);
         }
     }
-
-    async fn destroy(&mut self) {}
 }
 
 struct VirtualInput {

input-emulation/src/x11.rs

@@ -1,4 +1,3 @@
-use anyhow::{anyhow, Result};
 use async_trait::async_trait;
 use std::ptr;
 use x11::{
@@ -6,14 +5,14 @@ use x11::{
     xtest,
 };
 
-use crate::{
+use input_event::{
-    client::ClientHandle,
+    Event, KeyboardEvent, PointerEvent, BTN_BACK, BTN_FORWARD, BTN_LEFT, BTN_MIDDLE, BTN_RIGHT,
-    emulate::InputEmulation,
-    event::{
-        Event, KeyboardEvent, PointerEvent, BTN_BACK, BTN_FORWARD, BTN_LEFT, BTN_MIDDLE, BTN_RIGHT,
-    },
 };
 
+use crate::error::EmulationError;
+
+use super::{error::X11EmulationCreationError, EmulationHandle, InputEmulation};
+
 pub struct X11Emulation {
     display: *mut xlib::Display,
 }
@@ -21,11 +20,11 @@ pub struct X11Emulation {
 unsafe impl Send for X11Emulation {}
 
 impl X11Emulation {
-    pub fn new() -> Result<Self> {
+    pub fn new() -> Result<Self, X11EmulationCreationError> {
         let display = unsafe {
             match xlib::XOpenDisplay(ptr::null()) {
                 d if d == ptr::null::<xlib::Display>() as *mut xlib::Display => {
-                    Err(anyhow!("could not open display"))
+                    Err(X11EmulationCreationError::OpenDisplay)
                 }
                 display => Ok(display),
             }
@@ -101,7 +100,7 @@ impl Drop for X11Emulation {
 
 #[async_trait]
 impl InputEmulation for X11Emulation {
-    async fn consume(&mut self, event: Event, _: ClientHandle) {
+    async fn consume(&mut self, event: Event, _: EmulationHandle) -> Result<(), EmulationError> {
         match event {
             Event::Pointer(pointer_event) => match pointer_event {
                 PointerEvent::Motion {
@@ -142,11 +141,15 @@ impl InputEmulation for X11Emulation {
         unsafe {
             xlib::XFlush(self.display);
         }
+        // FIXME
+        Ok(())
     }
 
-    async fn notify(&mut self, _: crate::client::ClientEvent) {
+    async fn create(&mut self, _: EmulationHandle) {
         // for our purposes it does not matter what client sent the event
     }
 
-    async fn destroy(&mut self) {}
+    async fn destroy(&mut self, _: EmulationHandle) {
+        // for our purposes it does not matter what client sent the event
+    }
 }

input-emulation/src/xdg_desktop_portal.rs

@@ -4,26 +4,28 @@ use ashpd::{
         remote_desktop::{Axis, DeviceType, KeyState, RemoteDesktop},
         ResponseError, Session,
     },
+    zbus::AsyncDrop,
     WindowIdentifier,
 };
 use async_trait::async_trait;
 
-use crate::{
+use futures::FutureExt;
-    client::ClientEvent,
+use input_event::{
-    emulate::InputEmulation,
+    Event::{Keyboard, Pointer},
-    event::{
+    KeyboardEvent, PointerEvent,
-        Event::{Keyboard, Pointer},
-        KeyboardEvent, PointerEvent,
-    },
 };
 
+use crate::error::EmulationError;
+
+use super::{error::XdpEmulationCreationError, EmulationHandle, InputEmulation};
+
 pub struct DesktopPortalEmulation<'a> {
     proxy: RemoteDesktop<'a>,
     session: Session<'a>,
 }
 
 impl<'a> DesktopPortalEmulation<'a> {
-    pub async fn new() -> Result<DesktopPortalEmulation<'a>> {
+    pub async fn new() -> Result<DesktopPortalEmulation<'a>, XdpEmulationCreationError> {
         log::debug!("connecting to org.freedesktop.portal.RemoteDesktop portal ...");
         let proxy = RemoteDesktop::new().await?;
 
@@ -53,6 +55,7 @@ impl<'a> DesktopPortalEmulation<'a> {
         };
 
         log::debug!("started session");
+        let session = session;
 
         Ok(Self { proxy, session })
     }
@@ -60,7 +63,11 @@ impl<'a> DesktopPortalEmulation<'a> {
 
 #[async_trait]
 impl<'a> InputEmulation for DesktopPortalEmulation<'a> {
-    async fn consume(&mut self, event: crate::event::Event, _client: crate::client::ClientHandle) {
+    async fn consume(
+        &mut self,
+        event: input_event::Event,
+        _client: EmulationHandle,
+    ) -> Result<(), EmulationError> {
         match event {
             Pointer(p) => match p {
                 PointerEvent::Motion {
@@ -68,13 +75,9 @@ impl<'a> InputEmulation for DesktopPortalEmulation<'a> {
                     relative_x,
                     relative_y,
                 } => {
-                    if let Err(e) = self
+                    self.proxy
-                        .proxy
                         .notify_pointer_motion(&self.session, relative_x, relative_y)
-                        .await
+                        .await?;
-                    {
-                        log::warn!("{e}");
-                    }
                 }
                 PointerEvent::Button {
                     time: _,
@@ -85,26 +88,18 @@ impl<'a> InputEmulation for DesktopPortalEmulation<'a> {
                         0 => KeyState::Released,
                         _ => KeyState::Pressed,
                     };
-                    if let Err(e) = self
+                    self.proxy
-                        .proxy
                         .notify_pointer_button(&self.session, button as i32, state)
-                        .await
+                        .await?;
-                    {
-                        log::warn!("{e}");
-                    }
                 }
                 PointerEvent::AxisDiscrete120 { axis, value } => {
                     let axis = match axis {
                         0 => Axis::Vertical,
                         _ => Axis::Horizontal,
                     };
-                    if let Err(e) = self
+                    self.proxy
-                        .proxy
                         .notify_pointer_axis_discrete(&self.session, axis, value)
-                        .await
+                        .await?;
-                    {
-                        log::warn!("{e}");
-                    }
                 }
                 PointerEvent::Axis {
                     time: _,
@@ -119,13 +114,9 @@ impl<'a> InputEmulation for DesktopPortalEmulation<'a> {
                         Axis::Vertical => (0., value),
                         Axis::Horizontal => (value, 0.),
                     };
-                    if let Err(e) = self
+                    self.proxy
-                        .proxy
                         .notify_pointer_axis(&self.session, dx, dy, true)
-                        .await
+                        .await?;
-                    {
-                        log::warn!("{e}");
-                    }
                 }
                 PointerEvent::Frame {} => {}
             },
@@ -140,13 +131,9 @@ impl<'a> InputEmulation for DesktopPortalEmulation<'a> {
                             0 => KeyState::Released,
                             _ => KeyState::Pressed,
                         };
-                        if let Err(e) = self
+                        self.proxy
-                            .proxy
                             .notify_keyboard_keycode(&self.session, key as i32, state)
-                            .await
+                            .await?;
-                        {
-                            log::warn!("{e}");
-                        }
                     }
                     KeyboardEvent::Modifiers { .. } => {
                         // ignore
@@ -155,14 +142,28 @@ impl<'a> InputEmulation for DesktopPortalEmulation<'a> {
             }
             _ => {}
         }
+        Ok(())
     }
 
-    async fn notify(&mut self, _client: ClientEvent) {}
+    async fn create(&mut self, _client: EmulationHandle) {}
+    async fn destroy(&mut self, _client: EmulationHandle) {}
+}
 
-    async fn destroy(&mut self) {
+impl<'a> AsyncDrop for DesktopPortalEmulation<'a> {
-        log::debug!("closing remote desktop session");
+    #[doc = r" Perform the async cleanup."]
-        if let Err(e) = self.session.close().await {
+    #[must_use]
-            log::error!("failed to close remote desktop session: {e}");
+    #[allow(clippy::type_complexity, clippy::type_repetition_in_bounds)]
+    fn async_drop<'async_trait>(
+        self,
+    ) -> ::core::pin::Pin<
+        Box<dyn ::core::future::Future<Output = ()> + ::core::marker::Send + 'async_trait>,
+    >
+    where
+        Self: 'async_trait,
+    {
+        async move {
+            let _ = self.session.close().await;
         }
+        .boxed()
     }
 }

input-event/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "input-event"
+description = "cross-platform input-event types for input-capture / input-emulation"
+version = "0.1.0"
+edition = "2021"
+license = "GPL-3.0-or-later"
+repository = "https://github.com/ferdinandschober/lan-mouse"
+
+[dependencies]
+anyhow = "1.0.86"
+futures-core = "0.3.30"
+log = "0.4.22"
+num_enum = "0.7.2"
+serde = { version = "1.0", features = ["derive"] }

input-event/src/lib.rs

@@ -1,10 +1,11 @@
-use crate::scancode;
 use anyhow::{anyhow, Result};
 use std::{
     error::Error,
     fmt::{self, Display},
 };
 
+pub mod scancode;
+
 // FIXME
 pub const BTN_LEFT: u32 = 0x110;
 pub const BTN_RIGHT: u32 = 0x111;

nix/default.nix

@@ -2,10 +2,14 @@
   rustPlatform,
   lib,
   pkgs,
-}:
+}: let
+  cargoToml = builtins.fromTOML (builtins.readFile ../Cargo.toml);
+  pname = cargoToml.package.name;
+  version = cargoToml.package.version;
+in
 rustPlatform.buildRustPackage {
-  pname = "lan-mouse";
+  pname = pname;
-  version = "0.7.0";
+  version = version;
 
   nativeBuildInputs = with pkgs; [
     pkg-config
@@ -23,7 +27,7 @@ rustPlatform.buildRustPackage {
   ];
 
   src = builtins.path {
-    name = "lan-mouse";
+    name = pname;
     path = lib.cleanSource ../.;
   };
 
@@ -38,7 +42,7 @@ rustPlatform.buildRustPackage {
       Lan Mouse is a mouse and keyboard sharing software similar to universal-control on Apple devices. It allows for using multiple pcs with a single set of mouse and keyboard. This is also known as a Software KVM switch.
       The primary target is Wayland on Linux but Windows and MacOS and Linux on Xorg have partial support as well (see below for more details).
     '';
-    mainProgram = "lan-mouse";
+    mainProgram = pname;
     platforms = platforms.all;
   };
 }

src/capture.rs

@@ -1,78 +0,0 @@
-use std::io;
-
-use futures_core::Stream;
-
-use crate::{
-    client::{ClientEvent, ClientHandle},
-    event::Event,
-};
-
-#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
-pub mod libei;
-
-#[cfg(target_os = "macos")]
-pub mod macos;
-
-#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
-pub mod wayland;
-
-#[cfg(windows)]
-pub mod windows;
-
-#[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
-pub mod x11;
-
-/// fallback input capture (does not produce events)
-pub mod dummy;
-
-pub async fn create() -> Box<dyn InputCapture<Item = io::Result<(ClientHandle, Event)>>> {
-    #[cfg(target_os = "macos")]
-    match macos::MacOSInputCapture::new() {
-        Ok(p) => return Box::new(p),
-        Err(e) => log::info!("macos input capture not available: {e}"),
-    }
-
-    #[cfg(windows)]
-    match windows::WindowsInputCapture::new() {
-        Ok(p) => return Box::new(p),
-        Err(e) => log::info!("windows input capture not available: {e}"),
-    }
-
-    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
-    match libei::LibeiInputCapture::new().await {
-        Ok(p) => {
-            log::info!("using libei input capture");
-            return Box::new(p);
-        }
-        Err(e) => log::info!("libei input capture not available: {e}"),
-    }
-
-    #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
-    match wayland::WaylandInputCapture::new() {
-        Ok(p) => {
-            log::info!("using layer-shell input capture");
-            return Box::new(p);
-        }
-        Err(e) => log::info!("layer_shell input capture not available: {e}"),
-    }
-
-    #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
-    match x11::X11InputCapture::new() {
-        Ok(p) => {
-            log::info!("using x11 input capture");
-            return Box::new(p);
-        }
-        Err(e) => log::info!("x11 input capture not available: {e}"),
-    }
-
-    log::error!("falling back to dummy input capture");
-    Box::new(dummy::DummyInputCapture::new())
-}
-
-pub trait InputCapture: Stream<Item = io::Result<(ClientHandle, Event)>> + Unpin {
-    /// notify input capture of configuration changes
-    fn notify(&mut self, event: ClientEvent) -> io::Result<()>;
-
-    /// release mouse
-    fn release(&mut self) -> io::Result<()>;
-}

src/capture/macos.rs

@@ -1,33 +0,0 @@
-use crate::capture::InputCapture;
-use crate::client::{ClientEvent, ClientHandle};
-use crate::event::Event;
-use anyhow::{anyhow, Result};
-use futures_core::Stream;
-use std::task::{Context, Poll};
-use std::{io, pin::Pin};
-
-pub struct MacOSInputCapture;
-
-impl MacOSInputCapture {
-    pub fn new() -> Result<Self> {
-        Err(anyhow!("not yet implemented"))
-    }
-}
-
-impl Stream for MacOSInputCapture {
-    type Item = io::Result<(ClientHandle, Event)>;
-
-    fn poll_next(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
-        Poll::Pending
-    }
-}
-
-impl InputCapture for MacOSInputCapture {
-    fn notify(&mut self, _event: ClientEvent) -> io::Result<()> {
-        Ok(())
-    }
-
-    fn release(&mut self) -> io::Result<()> {
-        Ok(())
-    }
-}

src/capture/x11.rs

@@ -1,39 +0,0 @@
-use anyhow::{anyhow, Result};
-use std::io;
-use std::task::Poll;
-
-use futures_core::Stream;
-
-use crate::capture::InputCapture;
-use crate::event::Event;
-
-use crate::client::{ClientEvent, ClientHandle};
-
-pub struct X11InputCapture {}
-
-impl X11InputCapture {
-    pub fn new() -> Result<Self> {
-        Err(anyhow!("not implemented"))
-    }
-}
-
-impl InputCapture for X11InputCapture {
-    fn notify(&mut self, _event: ClientEvent) -> io::Result<()> {
-        Ok(())
-    }
-
-    fn release(&mut self) -> io::Result<()> {
-        Ok(())
-    }
-}
-
-impl Stream for X11InputCapture {
-    type Item = io::Result<(ClientHandle, Event)>;
-
-    fn poll_next(
-        self: std::pin::Pin<&mut Self>,
-        _cx: &mut std::task::Context<'_>,
-    ) -> std::task::Poll<Option<Self::Item>> {
-        Poll::Pending
-    }
-}

src/capture_test.rs

@@ -1,8 +1,8 @@
-use crate::capture;
+use crate::config::Config;
-use crate::client::{ClientEvent, Position};
-use crate::event::{Event, KeyboardEvent};
 use anyhow::{anyhow, Result};
 use futures::StreamExt;
+use input_capture::{self, Position};
+use input_event::{Event, KeyboardEvent};
 use tokio::task::LocalSet;
 
 pub fn run() -> Result<()> {
@@ -12,17 +12,20 @@ pub fn run() -> Result<()> {
         .enable_time()
         .build()?;
 
-    runtime.block_on(LocalSet::new().run_until(input_capture_test()))
+    let config = Config::new()?;
+
+    runtime.block_on(LocalSet::new().run_until(input_capture_test(config)))
 }
 
-async fn input_capture_test() -> Result<()> {
+async fn input_capture_test(config: Config) -> Result<()> {
     log::info!("creating input capture");
-    let mut input_capture = capture::create().await;
+    let backend = config.capture_backend.map(|b| b.into());
+    let mut input_capture = input_capture::create(backend).await?;
     log::info!("creating clients");
-    input_capture.notify(ClientEvent::Create(0, Position::Left))?;
+    input_capture.create(0, Position::Left)?;
-    input_capture.notify(ClientEvent::Create(1, Position::Right))?;
+    input_capture.create(1, Position::Right)?;
-    input_capture.notify(ClientEvent::Create(2, Position::Top))?;
+    input_capture.create(2, Position::Top)?;
-    input_capture.notify(ClientEvent::Create(3, Position::Bottom))?;
+    input_capture.create(3, Position::Bottom)?;
     loop {
         let (client, event) = input_capture
             .next()

src/client.rs

@@ -10,6 +10,7 @@ use serde::{Deserialize, Serialize};
 use slab::Slab;
 
 use crate::config::DEFAULT_PORT;
+use input_capture;
 
 #[derive(Debug, Eq, Hash, PartialEq, Clone, Copy, Serialize, Deserialize)]
 pub enum Position {
@@ -25,6 +26,17 @@ impl Default for Position {
     }
 }
 
+impl From<Position> for input_capture::Position {
+    fn from(position: Position) -> input_capture::Position {
+        match position {
+            Position::Left => input_capture::Position::Left,
+            Position::Right => input_capture::Position::Right,
+            Position::Top => input_capture::Position::Top,
+            Position::Bottom => input_capture::Position::Bottom,
+        }
+    }
+}
+
 #[derive(Debug)]
 pub struct PositionParseError {
     string: String,
@@ -52,17 +64,6 @@ impl FromStr for Position {
     }
 }
 
-impl Position {
-    pub fn opposite(&self) -> Self {
-        match self {
-            Position::Left => Self::Right,
-            Position::Right => Self::Left,
-            Position::Top => Self::Bottom,
-            Position::Bottom => Self::Top,
-        }
-    }
-}
-
 impl Display for Position {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(
@@ -118,12 +119,6 @@ impl Default for ClientConfig {
     }
 }
 
-#[derive(Clone, Copy, Debug)]
-pub enum ClientEvent {
-    Create(ClientHandle, Position),
-    Destroy(ClientHandle),
-}
-
 pub type ClientHandle = u64;
 
 #[derive(Debug, Default, Clone, Serialize, Deserialize)]

src/config.rs

@@ -1,22 +1,28 @@
 use anyhow::Result;
-use clap::Parser;
+use clap::{Parser, ValueEnum};
 use serde::{Deserialize, Serialize};
 use std::collections::HashSet;
 use std::env;
+use std::fmt::Display;
 use std::net::IpAddr;
 use std::{error::Error, fs};
 use toml;
 
 use crate::client::Position;
-use crate::scancode;
+
-use crate::scancode::Linux::{KeyLeftAlt, KeyLeftCtrl, KeyLeftMeta, KeyLeftShift};
+use input_event::scancode::{
+    self,
+    Linux::{KeyLeftAlt, KeyLeftCtrl, KeyLeftMeta, KeyLeftShift},
+};
 
 pub const DEFAULT_PORT: u16 = 4242;
 
 #[derive(Serialize, Deserialize, Debug)]
 pub struct ConfigToml {
+    pub capture_backend: Option<CaptureBackend>,
+    pub emulation_backend: Option<EmulationBackend>,
     pub port: Option<u16>,
-    pub frontend: Option<String>,
+    pub frontend: Option<Frontend>,
     pub release_bind: Option<Vec<scancode::Linux>>,
     pub left: Option<TomlClient>,
     pub right: Option<TomlClient>,
@@ -26,6 +32,7 @@ pub struct ConfigToml {
 
 #[derive(Serialize, Deserialize, Debug, Eq, PartialEq)]
 pub struct TomlClient {
+    pub capture_backend: Option<CaptureBackend>,
     pub hostname: Option<String>,
     pub host_name: Option<String>,
     pub ips: Option<Vec<IpAddr>>,
@@ -51,7 +58,7 @@ struct CliArgs {
 
     /// the frontend to use [cli | gtk]
     #[arg(short, long)]
-    frontend: Option<String>,
+    frontend: Option<Frontend>,
 
     /// non-default config file location
     #[arg(short, long)]
@@ -68,16 +75,144 @@ struct CliArgs {
     /// test input emulation
     #[arg(long)]
     test_emulation: bool,
+
+    /// capture backend override
+    #[arg(long)]
+    capture_backend: Option<CaptureBackend>,
+
+    /// emulation backend override
+    #[arg(long)]
+    emulation_backend: Option<EmulationBackend>,
 }
 
-#[derive(Debug, PartialEq, Eq)]
+#[derive(Clone, Copy, Debug, Deserialize, Eq, PartialEq, Serialize, ValueEnum)]
+pub enum CaptureBackend {
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    InputCapturePortal,
+    #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+    LayerShell,
+    #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+    X11,
+    #[cfg(windows)]
+    Windows,
+    #[cfg(target_os = "macos")]
+    MacOs,
+    Dummy,
+}
+
+impl Display for CaptureBackend {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+            CaptureBackend::InputCapturePortal => write!(f, "input-capture-portal"),
+            #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+            CaptureBackend::LayerShell => write!(f, "layer-shell"),
+            #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+            CaptureBackend::X11 => write!(f, "X11"),
+            #[cfg(windows)]
+            CaptureBackend::Windows => write!(f, "windows"),
+            #[cfg(target_os = "macos")]
+            CaptureBackend::MacOs => write!(f, "MacOS"),
+            CaptureBackend::Dummy => write!(f, "dummy"),
+        }
+    }
+}
+
+impl From<CaptureBackend> for input_capture::Backend {
+    fn from(backend: CaptureBackend) -> Self {
+        match backend {
+            #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+            CaptureBackend::InputCapturePortal => Self::InputCapturePortal,
+            #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+            CaptureBackend::LayerShell => Self::LayerShell,
+            #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+            CaptureBackend::X11 => Self::X11,
+            #[cfg(windows)]
+            CaptureBackend::Windows => Self::Windows,
+            #[cfg(target_os = "macos")]
+            CaptureBackend::MacOs => Self::MacOs,
+            CaptureBackend::Dummy => Self::Dummy,
+        }
+    }
+}
+
+#[derive(Clone, Copy, Debug, Deserialize, Eq, PartialEq, Serialize, ValueEnum)]
+pub enum EmulationBackend {
+    #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+    Wlroots,
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    Libei,
+    #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+    Xdp,
+    #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+    X11,
+    #[cfg(windows)]
+    Windows,
+    #[cfg(target_os = "macos")]
+    MacOs,
+    Dummy,
+}
+
+impl From<EmulationBackend> for input_emulation::Backend {
+    fn from(backend: EmulationBackend) -> Self {
+        match backend {
+            #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+            EmulationBackend::Wlroots => Self::Wlroots,
+            #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+            EmulationBackend::Libei => Self::Libei,
+            #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+            EmulationBackend::Xdp => Self::Xdp,
+            #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+            EmulationBackend::X11 => Self::X11,
+            #[cfg(windows)]
+            EmulationBackend::Windows => Self::Windows,
+            #[cfg(target_os = "macos")]
+            EmulationBackend::MacOs => Self::MacOs,
+            EmulationBackend::Dummy => Self::Dummy,
+        }
+    }
+}
+
+impl Display for EmulationBackend {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+            EmulationBackend::Wlroots => write!(f, "wlroots"),
+            #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+            EmulationBackend::Libei => write!(f, "libei"),
+            #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+            EmulationBackend::Xdp => write!(f, "xdg-desktop-portal"),
+            #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+            EmulationBackend::X11 => write!(f, "X11"),
+            #[cfg(windows)]
+            EmulationBackend::Windows => write!(f, "windows"),
+            #[cfg(target_os = "macos")]
+            EmulationBackend::MacOs => write!(f, "macos"),
+            EmulationBackend::Dummy => write!(f, "dummy"),
+        }
+    }
+}
+
+#[derive(Clone, Copy, Debug, Deserialize, PartialEq, Eq, Serialize, ValueEnum)]
 pub enum Frontend {
     Gtk,
     Cli,
 }
 
+impl Default for Frontend {
+    fn default() -> Self {
+        if cfg!(feature = "gtk") {
+            Self::Gtk
+        } else {
+            Self::Cli
+        }
+    }
+}
+
 #[derive(Debug)]
 pub struct Config {
+    pub capture_backend: Option<CaptureBackend>,
+    pub emulation_backend: Option<EmulationBackend>,
     pub frontend: Frontend,
     pub port: u16,
     pub clients: Vec<(TomlClient, Position)>,
@@ -129,33 +264,14 @@ impl Config {
             Ok(c) => Some(c),
         };
 
-        let frontend = match args.frontend {
+        let frontend_arg = args.frontend;
-            None => match &config_toml {
+        let frontend_cfg = config_toml.as_ref().and_then(|c| c.frontend);
-                Some(c) => c.frontend.clone(),
+        let frontend = frontend_arg.or(frontend_cfg).unwrap_or_default();
-                None => None,
-            },
-            frontend => frontend,
-        };
 
-        let frontend = match frontend {
+        let port = args
-            #[cfg(feature = "gtk")]
+            .port
-            None => Frontend::Gtk,
+            .or(config_toml.as_ref().and_then(|c| c.port))
-            #[cfg(not(feature = "gtk"))]
+            .unwrap_or(DEFAULT_PORT);
-            None => Frontend::Cli,
-            Some(s) => match s.as_str() {
-                "cli" => Frontend::Cli,
-                "gtk" => Frontend::Gtk,
-                _ => Frontend::Cli,
-            },
-        };
-
-        let port = match args.port {
-            Some(port) => port,
-            None => match &config_toml {
-                Some(c) => c.port.unwrap_or(DEFAULT_PORT),
-                None => DEFAULT_PORT,
-            },
-        };
 
         log::debug!("{config_toml:?}");
         let release_bind = config_toml
@@ -163,6 +279,14 @@ impl Config {
             .and_then(|c| c.release_bind.clone())
             .unwrap_or(Vec::from_iter(DEFAULT_RELEASE_KEYS.iter().cloned()));
 
+        let capture_backend = args
+            .capture_backend
+            .or(config_toml.as_ref().and_then(|c| c.capture_backend));
+
+        let emulation_backend = args
+            .emulation_backend
+            .or(config_toml.as_ref().and_then(|c| c.emulation_backend));
+
         let mut clients: Vec<(TomlClient, Position)> = vec![];
 
         if let Some(config_toml) = config_toml {
@@ -185,6 +309,8 @@ impl Config {
         let test_emulation = args.test_emulation;
 
         Ok(Config {
+            capture_backend,
+            emulation_backend,
             daemon,
             frontend,
             clients,

src/emulate.rs

@@ -1,98 +0,0 @@
-use async_trait::async_trait;
-use std::future;
-
-use crate::{
-    client::{ClientEvent, ClientHandle},
-    event::Event,
-};
-use anyhow::Result;
-
-#[cfg(windows)]
-pub mod windows;
-
-#[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
-pub mod x11;
-
-#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
-pub mod wlroots;
-
-#[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
-pub mod xdg_desktop_portal;
-
-#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
-pub mod libei;
-
-#[cfg(target_os = "macos")]
-pub mod macos;
-
-/// fallback input emulation (logs events)
-pub mod dummy;
-
-#[async_trait]
-pub trait InputEmulation: Send {
-    async fn consume(&mut self, event: Event, client_handle: ClientHandle);
-    async fn notify(&mut self, client_event: ClientEvent);
-    /// this function is waited on continuously and can be used to handle events
-    async fn dispatch(&mut self) -> Result<()> {
-        let _: () = future::pending().await;
-        Ok(())
-    }
-
-    async fn destroy(&mut self);
-}
-
-pub async fn create() -> Box<dyn InputEmulation> {
-    #[cfg(windows)]
-    match windows::WindowsEmulation::new() {
-        Ok(c) => return Box::new(c),
-        Err(e) => log::warn!("windows input emulation unavailable: {e}"),
-    }
-
-    #[cfg(target_os = "macos")]
-    match macos::MacOSEmulation::new() {
-        Ok(c) => {
-            log::info!("using macos input emulation");
-            return Box::new(c);
-        }
-        Err(e) => log::error!("macos input emulatino not available: {e}"),
-    }
-
-    #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
-    match wlroots::WlrootsEmulation::new() {
-        Ok(c) => {
-            log::info!("using wlroots input emulation");
-            return Box::new(c);
-        }
-        Err(e) => log::info!("wayland backend not available: {e}"),
-    }
-
-    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
-    match libei::LibeiEmulation::new().await {
-        Ok(c) => {
-            log::info!("using libei input emulation");
-            return Box::new(c);
-        }
-        Err(e) => log::info!("libei not available: {e}"),
-    }
-
-    #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
-    match xdg_desktop_portal::DesktopPortalEmulation::new().await {
-        Ok(c) => {
-            log::info!("using xdg-remote-desktop-portal input emulation");
-            return Box::new(c);
-        }
-        Err(e) => log::info!("remote desktop portal not available: {e}"),
-    }
-
-    #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
-    match x11::X11Emulation::new() {
-        Ok(c) => {
-            log::info!("using x11 input emulation");
-            return Box::new(c);
-        }
-        Err(e) => log::info!("x11 input emulation not available: {e}"),
-    }
-
-    log::error!("falling back to dummy input emulation");
-    Box::new(dummy::DummyEmulation::new())
-}

src/emulate/dummy.rs

@@ -1,26 +0,0 @@
-use crate::{
-    client::{ClientEvent, ClientHandle},
-    emulate::InputEmulation,
-    event::Event,
-};
-use async_trait::async_trait;
-
-#[derive(Default)]
-pub struct DummyEmulation;
-
-impl DummyEmulation {
-    pub fn new() -> Self {
-        Self {}
-    }
-}
-
-#[async_trait]
-impl InputEmulation for DummyEmulation {
-    async fn consume(&mut self, event: Event, client_handle: ClientHandle) {
-        log::info!("received event: ({client_handle}) {event}");
-    }
-    async fn notify(&mut self, client_event: ClientEvent) {
-        log::info!("{client_event:?}");
-    }
-    async fn destroy(&mut self) {}
-}

src/emulate/libei.rs

@@ -1,399 +0,0 @@
-use std::{
-    collections::HashMap,
-    os::{fd::OwnedFd, unix::net::UnixStream},
-    time::{SystemTime, UNIX_EPOCH},
-};
-
-use anyhow::{anyhow, Result};
-use ashpd::{
-    desktop::{
-        remote_desktop::{DeviceType, RemoteDesktop},
-        ResponseError,
-    },
-    WindowIdentifier,
-};
-use async_trait::async_trait;
-use futures::StreamExt;
-
-use reis::{
-    ei::{self, button::ButtonState, handshake::ContextType, keyboard::KeyState},
-    tokio::EiEventStream,
-    PendingRequestResult,
-};
-
-use crate::{
-    client::{ClientEvent, ClientHandle},
-    emulate::InputEmulation,
-    event::Event,
-};
-
-pub struct LibeiEmulation {
-    handshake: bool,
-    context: ei::Context,
-    events: EiEventStream,
-    pointer: Option<(ei::Device, ei::Pointer)>,
-    has_pointer: bool,
-    scroll: Option<(ei::Device, ei::Scroll)>,
-    has_scroll: bool,
-    button: Option<(ei::Device, ei::Button)>,
-    has_button: bool,
-    keyboard: Option<(ei::Device, ei::Keyboard)>,
-    has_keyboard: bool,
-    capabilities: HashMap<String, u64>,
-    capability_mask: u64,
-    sequence: u32,
-    serial: u32,
-}
-
-async fn get_ei_fd() -> Result<OwnedFd, ashpd::Error> {
-    let proxy = RemoteDesktop::new().await?;
-
-    // retry when user presses the cancel button
-    let (session, _) = loop {
-        log::debug!("creating session ...");
-        let session = proxy.create_session().await?;
-
-        log::debug!("selecting devices ...");
-        proxy
-            .select_devices(&session, DeviceType::Keyboard | DeviceType::Pointer)
-            .await?;
-
-        log::info!("requesting permission for input emulation");
-        match proxy
-            .start(&session, &WindowIdentifier::default())
-            .await?
-            .response()
-        {
-            Ok(d) => break (session, d),
-            Err(ashpd::Error::Response(ResponseError::Cancelled)) => {
-                log::warn!("request cancelled!");
-                continue;
-            }
-            e => e?,
-        };
-    };
-
-    proxy.connect_to_eis(&session).await
-}
-
-impl LibeiEmulation {
-    pub async fn new() -> Result<Self> {
-        // fd is owned by the message, so we need to dup it
-        let eifd = get_ei_fd().await?;
-        let stream = UnixStream::from(eifd);
-        // let stream = UnixStream::connect("/run/user/1000/eis-0")?;
-        stream.set_nonblocking(true)?;
-        let context = ei::Context::new(stream)?;
-        context.flush()?;
-        let events = EiEventStream::new(context.clone())?;
-        Ok(Self {
-            handshake: false,
-            context,
-            events,
-            pointer: None,
-            button: None,
-            scroll: None,
-            keyboard: None,
-            has_pointer: false,
-            has_button: false,
-            has_scroll: false,
-            has_keyboard: false,
-            capabilities: HashMap::new(),
-            capability_mask: 0,
-            sequence: 0,
-            serial: 0,
-        })
-    }
-}
-
-#[async_trait]
-impl InputEmulation for LibeiEmulation {
-    async fn consume(&mut self, event: Event, _client_handle: ClientHandle) {
-        let now = SystemTime::now()
-            .duration_since(UNIX_EPOCH)
-            .unwrap()
-            .as_micros() as u64;
-        match event {
-            Event::Pointer(p) => match p {
-                crate::event::PointerEvent::Motion {
-                    time: _,
-                    relative_x,
-                    relative_y,
-                } => {
-                    if !self.has_pointer {
-                        return;
-                    }
-                    if let Some((d, p)) = self.pointer.as_mut() {
-                        p.motion_relative(relative_x as f32, relative_y as f32);
-                        d.frame(self.serial, now);
-                    }
-                }
-                crate::event::PointerEvent::Button {
-                    time: _,
-                    button,
-                    state,
-                } => {
-                    if !self.has_button {
-                        return;
-                    }
-                    if let Some((d, b)) = self.button.as_mut() {
-                        b.button(
-                            button,
-                            match state {
-                                0 => ButtonState::Released,
-                                _ => ButtonState::Press,
-                            },
-                        );
-                        d.frame(self.serial, now);
-                    }
-                }
-                crate::event::PointerEvent::Axis {
-                    time: _,
-                    axis,
-                    value,
-                } => {
-                    if !self.has_scroll {
-                        return;
-                    }
-                    if let Some((d, s)) = self.scroll.as_mut() {
-                        match axis {
-                            0 => s.scroll(0., value as f32),
-                            _ => s.scroll(value as f32, 0.),
-                        }
-                        d.frame(self.serial, now);
-                    }
-                }
-                crate::event::PointerEvent::AxisDiscrete120 { axis, value } => {
-                    if !self.has_scroll {
-                        return;
-                    }
-                    if let Some((d, s)) = self.scroll.as_mut() {
-                        match axis {
-                            0 => s.scroll_discrete(0, value),
-                            _ => s.scroll_discrete(value, 0),
-                        }
-                        d.frame(self.serial, now);
-                    }
-                }
-                crate::event::PointerEvent::Frame {} => {}
-            },
-            Event::Keyboard(k) => match k {
-                crate::event::KeyboardEvent::Key {
-                    time: _,
-                    key,
-                    state,
-                } => {
-                    if !self.has_keyboard {
-                        return;
-                    }
-                    if let Some((d, k)) = &mut self.keyboard {
-                        k.key(
-                            key,
-                            match state {
-                                0 => KeyState::Released,
-                                _ => KeyState::Press,
-                            },
-                        );
-                        d.frame(self.serial, now);
-                    }
-                }
-                crate::event::KeyboardEvent::Modifiers { .. } => {}
-            },
-            _ => {}
-        }
-        self.context.flush().unwrap();
-    }
-
-    async fn dispatch(&mut self) -> Result<()> {
-        let event = match self.events.next().await {
-            Some(e) => e?,
-            None => return Err(anyhow!("libei connection lost")),
-        };
-        let event = match event {
-            PendingRequestResult::Request(result) => result,
-            PendingRequestResult::ParseError(e) => {
-                return Err(anyhow!("libei protocol violation: {e}"))
-            }
-            PendingRequestResult::InvalidObject(e) => return Err(anyhow!("invalid object {e}")),
-        };
-        match event {
-            ei::Event::Handshake(handshake, request) => match request {
-                ei::handshake::Event::HandshakeVersion { version } => {
-                    if self.handshake {
-                        return Ok(());
-                    }
-                    log::info!("libei version {}", version);
-                    // sender means we are sending events _to_ the eis server
-                    handshake.handshake_version(version); // FIXME
-                    handshake.context_type(ContextType::Sender);
-                    handshake.name("ei-demo-client");
-                    handshake.interface_version("ei_connection", 1);
-                    handshake.interface_version("ei_callback", 1);
-                    handshake.interface_version("ei_pingpong", 1);
-                    handshake.interface_version("ei_seat", 1);
-                    handshake.interface_version("ei_device", 2);
-                    handshake.interface_version("ei_pointer", 1);
-                    handshake.interface_version("ei_pointer_absolute", 1);
-                    handshake.interface_version("ei_scroll", 1);
-                    handshake.interface_version("ei_button", 1);
-                    handshake.interface_version("ei_keyboard", 1);
-                    handshake.interface_version("ei_touchscreen", 1);
-                    handshake.finish();
-                    self.handshake = true;
-                }
-                ei::handshake::Event::InterfaceVersion { name, version } => {
-                    log::debug!("handshake: Interface {name} @ {version}");
-                }
-                ei::handshake::Event::Connection { serial, connection } => {
-                    connection.sync(1);
-                    self.serial = serial;
-                }
-                _ => unreachable!(),
-            },
-            ei::Event::Connection(_connection, request) => match request {
-                ei::connection::Event::Seat { seat } => {
-                    log::debug!("connected to seat: {seat:?}");
-                }
-                ei::connection::Event::Ping { ping } => {
-                    ping.done(0);
-                }
-                ei::connection::Event::Disconnected {
-                    last_serial: _,
-                    reason,
-                    explanation,
-                } => {
-                    log::debug!("ei - disconnected: reason: {reason:?}: {explanation}")
-                }
-                ei::connection::Event::InvalidObject {
-                    last_serial,
-                    invalid_id,
-                } => {
-                    return Err(anyhow!(
-                        "invalid object: id: {invalid_id}, serial: {last_serial}"
-                    ));
-                }
-                _ => unreachable!(),
-            },
-            ei::Event::Device(device, request) => match request {
-                ei::device::Event::Destroyed { serial } => {
-                    log::debug!("device destroyed: {device:?} - serial: {serial}")
-                }
-                ei::device::Event::Name { name } => {
-                    log::debug!("device name: {name}")
-                }
-                ei::device::Event::DeviceType { device_type } => {
-                    log::debug!("device type: {device_type:?}")
-                }
-                ei::device::Event::Dimensions { width, height } => {
-                    log::debug!("device dimensions: {width}x{height}")
-                }
-                ei::device::Event::Region {
-                    offset_x,
-                    offset_y,
-                    width,
-                    hight,
-                    scale,
-                } => log::debug!(
-                    "device region: {width}x{hight} @ ({offset_x},{offset_y}), scale: {scale}"
-                ),
-                ei::device::Event::Interface { object } => {
-                    log::debug!("device interface: {object:?}");
-                    if object.interface().eq("ei_pointer") {
-                        log::debug!("GOT POINTER DEVICE");
-                        self.pointer.replace((device, object.downcast().unwrap()));
-                    } else if object.interface().eq("ei_button") {
-                        log::debug!("GOT BUTTON DEVICE");
-                        self.button.replace((device, object.downcast().unwrap()));
-                    } else if object.interface().eq("ei_scroll") {
-                        log::debug!("GOT SCROLL DEVICE");
-                        self.scroll.replace((device, object.downcast().unwrap()));
-                    } else if object.interface().eq("ei_keyboard") {
-                        log::debug!("GOT KEYBOARD DEVICE");
-                        self.keyboard.replace((device, object.downcast().unwrap()));
-                    }
-                }
-                ei::device::Event::Done => {
-                    log::debug!("device: done {device:?}");
-                }
-                ei::device::Event::Resumed { serial } => {
-                    self.serial = serial;
-                    device.start_emulating(serial, self.sequence);
-                    self.sequence += 1;
-                    log::debug!("resumed: {device:?}");
-                    if let Some((d, _)) = &mut self.pointer {
-                        if d == &device {
-                            log::debug!("pointer resumed {serial}");
-                            self.has_pointer = true;
-                        }
-                    }
-                    if let Some((d, _)) = &mut self.button {
-                        if d == &device {
-                            log::debug!("button resumed {serial}");
-                            self.has_button = true;
-                        }
-                    }
-                    if let Some((d, _)) = &mut self.scroll {
-                        if d == &device {
-                            log::debug!("scroll resumed {serial}");
-                            self.has_scroll = true;
-                        }
-                    }
-                    if let Some((d, _)) = &mut self.keyboard {
-                        if d == &device {
-                            log::debug!("keyboard resumed {serial}");
-                            self.has_keyboard = true;
-                        }
-                    }
-                }
-                ei::device::Event::Paused { serial } => {
-                    self.has_pointer = false;
-                    self.has_button = false;
-                    self.serial = serial;
-                }
-                ei::device::Event::StartEmulating { serial, sequence } => {
-                    log::debug!("start emulating {serial}, {sequence}")
-                }
-                ei::device::Event::StopEmulating { serial } => {
-                    log::debug!("stop emulating {serial}")
-                }
-                ei::device::Event::Frame { serial, timestamp } => {
-                    log::debug!("frame: {serial}, {timestamp}");
-                }
-                ei::device::Event::RegionMappingId { mapping_id } => {
-                    log::debug!("RegionMappingId {mapping_id}")
-                }
-                e => log::debug!("invalid event: {e:?}"),
-            },
-            ei::Event::Seat(seat, request) => match request {
-                ei::seat::Event::Destroyed { serial } => {
-                    self.serial = serial;
-                    log::debug!("seat destroyed: {seat:?}");
-                }
-                ei::seat::Event::Name { name } => {
-                    log::debug!("seat name: {name}");
-                }
-                ei::seat::Event::Capability { mask, interface } => {
-                    log::debug!("seat capabilities: {mask}, interface: {interface:?}");
-                    self.capabilities.insert(interface, mask);
-                    self.capability_mask |= mask;
-                }
-                ei::seat::Event::Done => {
-                    log::debug!("seat done");
-                    log::debug!("binding capabilities: {}", self.capability_mask);
-                    seat.bind(self.capability_mask);
-                }
-                ei::seat::Event::Device { device } => {
-                    log::debug!("seat: new device - {device:?}");
-                }
-                _ => todo!(),
-            },
-            e => log::debug!("unhandled event: {e:?}"),
-        }
-        self.context.flush()?;
-        Ok(())
-    }
-
-    async fn notify(&mut self, _client_event: ClientEvent) {}
-
-    async fn destroy(&mut self) {}
-}

src/emulation_test.rs

@@ -1,7 +1,6 @@
-use crate::client::{ClientEvent, Position};
+use crate::config::Config;
-use crate::emulate;
-use crate::event::{Event, PointerEvent};
 use anyhow::Result;
+use input_event::{Event, PointerEvent};
 use std::f64::consts::PI;
 use std::time::{Duration, Instant};
 use tokio::task::LocalSet;
@@ -13,36 +12,38 @@ pub fn run() -> Result<()> {
         .enable_time()
         .build()?;
 
-    runtime.block_on(LocalSet::new().run_until(input_emulation_test()))
+    let config = Config::new()?;
+
+    runtime.block_on(LocalSet::new().run_until(input_emulation_test(config)))
 }
 
 const FREQUENCY_HZ: f64 = 1.0;
 const RADIUS: f64 = 100.0;
 
-async fn input_emulation_test() -> Result<()> {
+async fn input_emulation_test(config: Config) -> Result<()> {
-    let mut emulation = emulate::create().await;
+    let backend = config.emulation_backend.map(|b| b.into());
-    emulation
+    let mut emulation = input_emulation::create(backend).await?;
-        .notify(ClientEvent::Create(0, Position::Left))
+    emulation.create(0).await;
-        .await;
     let start = Instant::now();
     let mut offset = (0, 0);
     loop {
-        tokio::select! {
+        tokio::time::sleep(Duration::from_millis(1)).await;
-            _ = emulation.dispatch() => {}
+        let elapsed = start.elapsed();
-            _ = tokio::time::sleep(Duration::from_millis(1)) => {
+        let elapsed_sec_f64 = elapsed.as_secs_f64();
-                let elapsed = start.elapsed();
+        let second_fraction = elapsed_sec_f64 - elapsed_sec_f64 as u64 as f64;
-                let elapsed_sec_f64 = elapsed.as_secs_f64();
+        let radians = second_fraction * 2. * PI * FREQUENCY_HZ;
-                let second_fraction = elapsed_sec_f64 - elapsed_sec_f64 as u64 as f64;
+        let new_offset_f = (radians.cos() * RADIUS * 2., (radians * 2.).sin() * RADIUS);
-                let radians = second_fraction * 2. * PI * FREQUENCY_HZ;
+        let new_offset = (new_offset_f.0 as i32, new_offset_f.1 as i32);
-                let new_offset_f = (radians.cos() * RADIUS * 2., (radians * 2.).sin() * RADIUS);
+        if new_offset != offset {
-                let new_offset = (new_offset_f.0 as i32, new_offset_f.1 as i32);
+            let relative_motion = (new_offset.0 - offset.0, new_offset.1 - offset.1);
-                if new_offset != offset {
+            offset = new_offset;
-                    let relative_motion = (new_offset.0 - offset.0, new_offset.1 - offset.1);
+            let (relative_x, relative_y) = (relative_motion.0 as f64, relative_motion.1 as f64);
-                    offset = new_offset;
+            let event = Event::Pointer(PointerEvent::Motion {
-                    let (relative_x, relative_y) = (relative_motion.0 as f64, relative_motion.1 as f64);
+                time: 0,
-                    emulation.consume(Event::Pointer(PointerEvent::Motion {time: 0, relative_x, relative_y }), 0).await;
+                relative_x,
-                }
+                relative_y,
-            }
+            });
+            emulation.consume(event, 0).await?;
         }
     }
 }

src/frontend/gtk.rs

@@ -11,6 +11,7 @@ use std::{
 use crate::frontend::{gtk::window::Window, FrontendRequest};
 
 use adw::Application;
+use endi::{Endian, ReadBytes};
 use gtk::{
     gdk::Display, glib::clone, prelude::*, subclass::prelude::ObjectSubclassIsExt, IconTheme,
 };
@@ -85,16 +86,14 @@ fn build_ui(app: &Application) {
     gio::spawn_blocking(move || {
         match loop {
             // read length
-            let mut len = [0u8; 8];
+            let len = match rx.read_u64(Endian::Big) {
-            match rx.read_exact(&mut len) {
+                Ok(l) => l,
-                Ok(_) => (),
                 Err(e) if e.kind() == ErrorKind::UnexpectedEof => break Ok(()),
                 Err(e) => break Err(e),
             };
-            let len = usize::from_be_bytes(len);
 
             // read payload
-            let mut buf = vec![0u8; len];
+            let mut buf = vec![0u8; len as usize];
             match rx.read_exact(&mut buf) {
                 Ok(_) => (),
                 Err(e) if e.kind() == ErrorKind::UnexpectedEof => break Ok(()),

src/frontend/gtk/window.rs

@@ -10,6 +10,7 @@ use std::net::TcpStream;
 
 use adw::prelude::*;
 use adw::subclass::prelude::*;
+use endi::{Endian, WriteBytes};
 use glib::{clone, Object};
 use gtk::{
     gio,
@@ -265,8 +266,7 @@ impl Window {
         let mut stream = self.imp().stream.borrow_mut();
         let stream = stream.as_mut().unwrap();
         let bytes = json.as_bytes();
-        let len = bytes.len().to_be_bytes();
+        if let Err(e) = stream.write_u64(Endian::Big, bytes.len() as u64) {
-        if let Err(e) = stream.write(&len) {
             log::error!("error sending message: {e}");
         };
         if let Err(e) = stream.write(bytes) {

src/lib.rs

@@ -1,13 +1,8 @@
 pub mod client;
 pub mod config;
 pub mod dns;
-pub mod event;
 pub mod server;
 
-pub mod capture;
-pub mod emulate;
-
 pub mod capture_test;
 pub mod emulation_test;
 pub mod frontend;
-pub mod scancode;

src/main.rs

@@ -68,10 +68,12 @@ fn run_service(config: &Config) -> Result<()> {
     // run async event loop
     runtime.block_on(LocalSet::new().run_until(async {
         // run main loop
-        log::info!("Press Ctrl+Alt+Shift+Super to release the mouse");
+        log::info!("Press {:?} to release the mouse", config.release_bind);
 
         let server = Server::new(config);
-        server.run().await?;
+        server
+            .run(config.capture_backend, config.emulation_backend)
+            .await?;
 
         log::debug!("service exiting");
         anyhow::Ok(())

src/server.rs

@@ -8,7 +8,7 @@ use tokio::signal;
 
 use crate::{
     client::{ClientConfig, ClientHandle, ClientManager, ClientState},
-    config::Config,
+    config::{CaptureBackend, Config, EmulationBackend},
     dns,
     frontend::{FrontendListener, FrontendRequest},
     server::capture_task::CaptureEvent,
@@ -40,7 +40,7 @@ pub struct Server {
     client_manager: Rc<RefCell<ClientManager>>,
     port: Rc<Cell<u16>>,
     state: Rc<Cell<State>>,
-    release_bind: Vec<crate::scancode::Linux>,
+    release_bind: Vec<input_event::scancode::Linux>,
 }
 
 impl Server {
@@ -77,7 +77,11 @@ impl Server {
         }
     }
 
-    pub async fn run(&self) -> anyhow::Result<()> {
+    pub async fn run(
+        &self,
+        capture_backend: Option<CaptureBackend>,
+        emulation_backend: Option<EmulationBackend>,
+    ) -> anyhow::Result<()> {
         // create frontend communication adapter
         let frontend = match FrontendListener::new().await {
             Some(f) => f?,
@@ -97,20 +101,22 @@ impl Server {
 
         // input capture
         let (mut capture_task, capture_channel) = capture_task::new(
+            capture_backend,
             self.clone(),
             sender_tx.clone(),
             timer_tx.clone(),
             self.release_bind.clone(),
-        );
+        )?;
 
         // input emulation
         let (mut emulation_task, emulate_channel) = emulation_task::new(
+            emulation_backend,
             self.clone(),
             receiver_rx,
             sender_tx.clone(),
             capture_channel.clone(),
             timer_tx,
-        );
+        )?;
 
         // create dns resolver
         let resolver = dns::DnsResolver::new().await?;

src/server/capture_task.rs

@@ -4,13 +4,11 @@ use std::{collections::HashSet, net::SocketAddr};
 
 use tokio::{process::Command, sync::mpsc::Sender, task::JoinHandle};
 
-use crate::{
+use input_capture::{self, error::CaptureCreationError, CaptureHandle, InputCapture, Position};
-    capture::{self, InputCapture},
+
-    client::{ClientEvent, ClientHandle},
+use input_event::{scancode, Event, KeyboardEvent};
-    event::{Event, KeyboardEvent},
+
-    scancode,
+use crate::{client::ClientHandle, config::CaptureBackend, server::State};
-    server::State,
-};
 
 use super::Server;
 
@@ -18,21 +16,25 @@ use super::Server;
 pub enum CaptureEvent {
     /// capture must release the mouse
     Release,
-    /// capture is notified of a change in client states
+    /// add a capture client
-    ClientEvent(ClientEvent),
+    Create(CaptureHandle, Position),
+    /// destory a capture client
+    Destroy(CaptureHandle),
     /// termination signal
     Terminate,
 }
 
 pub fn new(
+    backend: Option<CaptureBackend>,
     server: Server,
     sender_tx: Sender<(Event, SocketAddr)>,
     timer_tx: Sender<()>,
     release_bind: Vec<scancode::Linux>,
-) -> (JoinHandle<Result<()>>, Sender<CaptureEvent>) {
+) -> Result<(JoinHandle<Result<()>>, Sender<CaptureEvent>), CaptureCreationError> {
     let (tx, mut rx) = tokio::sync::mpsc::channel(32);
+    let backend = backend.map(|b| b.into());
     let task = tokio::task::spawn_local(async move {
-        let mut capture = capture::create().await;
+        let mut capture = input_capture::create(backend).await?;
         let mut pressed_keys = HashSet::new();
         loop {
             tokio::select! {
@@ -50,9 +52,9 @@ pub fn new(
                             CaptureEvent::Release => {
                                 capture.release()?;
                                 server.state.replace(State::Receiving);
-
                             }
-                            CaptureEvent::ClientEvent(e) => capture.notify(e)?,
+                            CaptureEvent::Create(h, p) => capture.create(h, p)?,
+                            CaptureEvent::Destroy(h) => capture.destroy(h)?,
                             CaptureEvent::Terminate => break,
                         },
                         None => break,
@@ -62,7 +64,7 @@ pub fn new(
         }
         anyhow::Ok(())
     });
-    (task, tx)
+    Ok((task, tx))
 }
 
 fn update_pressed_keys(pressed_keys: &mut HashSet<scancode::Linux>, key: u32, state: u8) {
@@ -80,7 +82,7 @@ async fn handle_capture_event(
     capture: &mut Box<dyn InputCapture>,
     sender_tx: &Sender<(Event, SocketAddr)>,
     timer_tx: &Sender<()>,
-    event: (ClientHandle, Event),
+    event: (CaptureHandle, Event),
     pressed_keys: &mut HashSet<scancode::Linux>,
     release_bind: &[scancode::Linux],
 ) -> Result<()> {

src/server/emulation_task.rs

@@ -6,20 +6,22 @@ use tokio::{
     task::JoinHandle,
 };
 
-use crate::{
+use crate::{client::ClientHandle, config::EmulationBackend, server::State};
-    client::{ClientEvent, ClientHandle},
+use input_emulation::{
-    emulate::{self, InputEmulation},
+    self,
-    event::{Event, KeyboardEvent},
+    error::{EmulationCreationError, EmulationError},
-    scancode,
+    EmulationHandle, InputEmulation,
-    server::State,
 };
+use input_event::{Event, KeyboardEvent};
 
 use super::{CaptureEvent, Server};
 
 #[derive(Clone, Debug)]
 pub enum EmulationEvent {
-    /// input emulation is notified of a change in client states
+    /// create a new client
-    ClientEvent(ClientEvent),
+    Create(EmulationHandle),
+    /// destroy a client
+    Destroy(EmulationHandle),
     /// input emulation must release keys for client
     ReleaseKeys(ClientHandle),
     /// termination signal
@@ -27,36 +29,36 @@ pub enum EmulationEvent {
 }
 
 pub fn new(
+    backend: Option<EmulationBackend>,
     server: Server,
     mut udp_rx: Receiver<Result<(Event, SocketAddr)>>,
     sender_tx: Sender<(Event, SocketAddr)>,
     capture_tx: Sender<CaptureEvent>,
     timer_tx: Sender<()>,
-) -> (JoinHandle<Result<()>>, Sender<EmulationEvent>) {
+) -> Result<(JoinHandle<Result<()>>, Sender<EmulationEvent>), EmulationCreationError> {
     let (tx, mut rx) = tokio::sync::mpsc::channel(32);
     let emulate_task = tokio::task::spawn_local(async move {
-        let mut emulate = emulate::create().await;
+        let backend = backend.map(|b| b.into());
+        let mut emulate = input_emulation::create(backend).await?;
         let mut last_ignored = None;
 
         loop {
             tokio::select! {
                 udp_event = udp_rx.recv() => {
                     let udp_event = udp_event.ok_or(anyhow!("receiver closed"))??;
-                    handle_udp_rx(&server, &capture_tx, &mut emulate, &sender_tx, &mut last_ignored, udp_event, &timer_tx).await;
+                    handle_udp_rx(&server, &capture_tx, &mut emulate, &sender_tx, &mut last_ignored, udp_event, &timer_tx).await?;
                 }
                 emulate_event = rx.recv() => {
                     match emulate_event {
                         Some(e) => match e {
-                            EmulationEvent::ClientEvent(e) => emulate.notify(e).await,
+                            EmulationEvent::Create(h) => emulate.create(h).await,
-                            EmulationEvent::ReleaseKeys(c) => release_keys(&server, &mut emulate, c).await,
+                            EmulationEvent::Destroy(h) => emulate.destroy(h).await,
+                            EmulationEvent::ReleaseKeys(c) => release_keys(&server, &mut emulate, c).await?,
                             EmulationEvent::Terminate => break,
                         },
                         None => break,
                     }
                 }
-                res = emulate.dispatch() => {
-                    res?;
-                }
             }
         }
 
@@ -68,14 +70,12 @@ pub fn new(
             .map(|(h, _)| h)
             .collect::<Vec<_>>();
         for client in clients {
-            release_keys(&server, &mut emulate, client).await;
+            release_keys(&server, &mut emulate, client).await?;
         }
 
-        // destroy emulator
-        emulate.destroy().await;
         anyhow::Ok(())
     });
-    (emulate_task, tx)
+    Ok((emulate_task, tx))
 }
 
 async fn handle_udp_rx(
@@ -86,7 +86,7 @@ async fn handle_udp_rx(
     last_ignored: &mut Option<SocketAddr>,
     event: (Event, SocketAddr),
     timer_tx: &Sender<()>,
-) {
+) -> Result<(), EmulationError> {
     let (event, addr) = event;
 
     // get handle for addr
@@ -97,7 +97,7 @@ async fn handle_udp_rx(
                 log::warn!("ignoring events from client {addr}");
                 last_ignored.replace(addr);
             }
-            return;
+            return Ok(());
         }
     };
 
@@ -111,7 +111,7 @@ async fn handle_udp_rx(
             Some((_, s)) => s,
             None => {
                 log::error!("unknown handle");
-                return;
+                return Ok(());
             }
         };
 
@@ -127,7 +127,7 @@ async fn handle_udp_rx(
             let _ = sender_tx.send((Event::Pong(), addr)).await;
         }
         (Event::Disconnect(), _) => {
-            release_keys(server, emulate, handle).await;
+            release_keys(server, emulate, handle).await?;
         }
         (event, addr) => {
             // tell clients that we are ready to receive events
@@ -160,7 +160,7 @@ async fn handle_udp_rx(
                             s
                         } else {
                             log::error!("unknown handle");
-                            return;
+                            return Ok(());
                         };
                         if state == 0 {
                             // ignore release event if key not pressed
@@ -175,7 +175,7 @@ async fn handle_udp_rx(
                     // workaround buggy rdp backend.
                     if !ignore_event {
                         // consume event
-                        emulate.consume(event, handle).await;
+                        emulate.consume(event, handle).await?;
                         log::trace!("{event} => emulate");
                     }
                 }
@@ -200,13 +200,14 @@ async fn handle_udp_rx(
             }
         }
     }
+    Ok(())
 }
 
 async fn release_keys(
     server: &Server,
     emulate: &mut Box<dyn InputEmulation>,
     client: ClientHandle,
-) {
+) -> Result<(), EmulationError> {
     let keys = server
         .client_manager
         .borrow_mut()
@@ -221,19 +222,18 @@ async fn release_keys(
             key,
             state: 0,
         });
-        emulate.consume(event, client).await;
+        emulate.consume(event, client).await?;
-        if let Ok(key) = scancode::Linux::try_from(key) {
+        if let Ok(key) = input_event::scancode::Linux::try_from(key) {
             log::warn!("releasing stuck key: {key:?}");
         }
     }
 
-    let modifiers_event = KeyboardEvent::Modifiers {
+    let event = Event::Keyboard(KeyboardEvent::Modifiers {
         mods_depressed: 0,
         mods_latched: 0,
         mods_locked: 0,
         group: 0,
-    };
+    });
-    emulate
+    emulate.consume(event, client).await?;
-        .consume(Event::Keyboard(modifiers_event), client)
+    Ok(())
-        .await;
 }

src/server/frontend_task.rs

@@ -17,7 +17,7 @@ use tokio::{
 };
 
 use crate::{
-    client::{ClientEvent, ClientHandle, Position},
+    client::{ClientHandle, Position},
     frontend::{self, FrontendEvent, FrontendListener, FrontendRequest},
 };
 
@@ -205,9 +205,8 @@ pub async fn deactivate_client(
         None => return,
     };
 
-    let event = ClientEvent::Destroy(handle);
+    let _ = capture.send(CaptureEvent::Destroy(handle)).await;
-    let _ = capture.send(CaptureEvent::ClientEvent(event)).await;
+    let _ = emulate.send(EmulationEvent::Destroy(handle)).await;
-    let _ = emulate.send(EmulationEvent::ClientEvent(event)).await;
 }
 
 pub async fn activate_client(
@@ -237,9 +236,8 @@ pub async fn activate_client(
     };
 
     /* notify emulation, capture and frontends */
-    let event = ClientEvent::Create(handle, pos);
+    let _ = capture.send(CaptureEvent::Create(handle, pos.into())).await;
-    let _ = capture.send(CaptureEvent::ClientEvent(event)).await;
+    let _ = emulate.send(EmulationEvent::Create(handle)).await;
-    let _ = emulate.send(EmulationEvent::ClientEvent(event)).await;
 }
 
 pub async fn remove_client(
@@ -258,9 +256,8 @@ pub async fn remove_client(
     };
 
     if active {
-        let destroy = ClientEvent::Destroy(handle);
+        let _ = capture.send(CaptureEvent::Destroy(handle)).await;
-        let _ = capture.send(CaptureEvent::ClientEvent(destroy)).await;
+        let _ = emulate.send(EmulationEvent::Destroy(handle)).await;
-        let _ = emulate.send(EmulationEvent::ClientEvent(destroy)).await;
     }
 }
 
@@ -335,13 +332,11 @@ async fn update_pos(
     // update state in event input emulator & input capture
     if changed {
         if active {
-            let destroy = ClientEvent::Destroy(handle);
+            let _ = capture.send(CaptureEvent::Destroy(handle)).await;
-            let _ = capture.send(CaptureEvent::ClientEvent(destroy)).await;
+            let _ = emulate.send(EmulationEvent::Destroy(handle)).await;
-            let _ = emulate.send(EmulationEvent::ClientEvent(destroy)).await;
         }
-        let create = ClientEvent::Create(handle, pos);
+        let _ = capture.send(CaptureEvent::Create(handle, pos.into())).await;
-        let _ = capture.send(CaptureEvent::ClientEvent(create)).await;
+        let _ = emulate.send(EmulationEvent::Create(handle)).await;
-        let _ = emulate.send(EmulationEvent::ClientEvent(create)).await;
     }
 }
 

src/server/network_task.rs

@@ -7,7 +7,8 @@ use tokio::{
     task::JoinHandle,
 };
 
-use crate::{event::Event, frontend::FrontendEvent};
+use crate::frontend::FrontendEvent;
+use input_event::Event;
 
 use super::Server;
 

src/server/ping_task.rs

@@ -5,7 +5,9 @@ use tokio::{
     task::JoinHandle,
 };
 
-use crate::{client::ClientHandle, event::Event};
+use input_event::Event;
+
+use crate::client::ClientHandle;
 
 use super::{capture_task::CaptureEvent, emulation_task::EmulationEvent, Server, State};