remove anyhow dependency from input-emulation

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

Cargo.toml

@@ -1,74 +1,55 @@
+[workspace]
+members = [
+    "input-capture",
+    "input-emulation",
+    "input-event",
+]
+
 [package]
 name = "lan-mouse"
 description = "Software KVM Switch / mouse & keyboard sharing software for Local Area Networks"
-version = "0.7.3"
+version = "0.8.0"
 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"
 log = "0.4.20"
 env_logger = "0.11.3"
 serde_json = "1.0.107"
-tokio = {version = "1.32.0", features = ["io-util", "io-std", "macros", "net", "rt", "sync", "signal"] }
-async-trait = "0.1.73"
-futures-core = "0.3.28"
+tokio = {version = "1.32.0", features = ["io-util", "io-std", "macros", "net", "process", "rt", "sync", "signal"] }
 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"]
-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"]
+default = [ "wayland", "x11", "xdg_desktop_portal", "libei", "gtk" ]
+wayland = [ "input-capture/wayland", "input-emulation/wayland" ]
+x11 = [ "input-capture/x11", "input-emulation/x11" ]
+xdg_desktop_portal = [ "input-emulation/xdg_desktop_portal" ]
+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,
-        "narHash": "sha256-qrxvLS888pNJFwJdK+hf1wpRCSQcqA6W5+Ox202NDa0=",
+        "lastModified": 1716293225,
+        "narHash": "sha256-pU9ViBVE3XYb70xZx+jK6SEVphvt7xMTbm6yDIF4xPs=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "b06025f1533a1e07b6db3e75151caa155d1c7eb3",
+        "rev": "3eaeaeb6b1e08a016380c279f8846e0bd8808916",
         "type": "github"
       },
       "original": {
@@ -48,11 +48,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1710987136,
-        "narHash": "sha256-Q8GRdlAIKZ8tJUXrbcRO1pA33AdoPfTUirsSnmGQnOU=",
+        "lastModified": 1716257780,
+        "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 crate::event::Event;
+use input_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 +1,120 @@
+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,
+};
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+use reis::tokio::{EiConvertEventStreamError, HandshakeError};
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+#[error("error in libei stream: {inner:?}")]
+pub struct ReisConvertEventStreamError {
+    inner: EiConvertEventStreamError,
+}
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+impl From<EiConvertEventStreamError> for ReisConvertEventStreamError {
+    fn from(e: EiConvertEventStreamError) -> Self {
+        Self { inner: e }
+    }
+}
+
+#[derive(Debug, Error)]
+pub enum CaptureError {
+    #[error("activation stream closed unexpectedly")]
+    ActivationClosed,
+    #[error("libei stream was closed")]
+    EndOfStream,
+    #[error("io error: `{0}`")]
+    Io(#[from] std::io::Error),
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    #[error("error in libei stream: `{0}`")]
+    Reis(#[from] ReisConvertEventStreamError),
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    #[error("libei handshake failed: `{0}`")]
+    Handshake(#[from] HandshakeError),
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    #[error(transparent)]
+    Portal(#[from] ashpd::Error),
+}
+
+#[derive(Debug, Error)]
+pub enum CaptureCreationError {
+    #[error("no backend available")]
+    NoAvailableBackend,
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    #[error("error creating input-capture-portal backend: `{0}`")]
+    Libei(#[from] LibeiCaptureCreationError),
+    #[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+    #[error("error creating layer-shell capture backend: `{0}`")]
+    LayerShell(#[from] LayerShellCaptureCreationError),
+    #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+    #[error("error creating x11 capture backend: `{0}`")]
+    X11(#[from] X11InputCaptureCreationError),
+    #[cfg(target_os = "macos")]
+    #[error("error creating macos capture backend: `{0}`")]
+    Macos(#[from] MacOSInputCaptureCreationError),
+    #[cfg(windows)]
+    #[error("error creating windows capture backend")]
+    Windows,
+}
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum LibeiCaptureCreationError {
+    #[error("xdg-desktop-portal: `{0}`")]
+    Ashpd(#[from] ashpd::Error),
+}
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+#[error("{protocol} protocol not supported: {inner}")]
+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")))]
+#[derive(Debug, Error)]
+pub enum LayerShellCaptureCreationError {
+    #[error(transparent)]
+    Connect(#[from] ConnectError),
+    #[error(transparent)]
+    Global(#[from] GlobalError),
+    #[error(transparent)]
+    Wayland(#[from] WaylandError),
+    #[error(transparent)]
+    Bind(#[from] WaylandBindError),
+    #[error(transparent)]
+    Dispatch(#[from] DispatchError),
+    #[error(transparent)]
+    Io(#[from] io::Error),
+}
+
+#[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum X11InputCaptureCreationError {
+    #[error("X11 input capture is not yet implemented :(")]
+    NotImplemented,
+}
+
+#[cfg(target_os = "macos")]
+#[derive(Debug, Error)]
+pub enum MacOSInputCaptureCreationError {
+    #[error("MacOS input capture is not yet implemented :(")]
+    NotImplemented,
+}

input-capture/src/lib.rs

@@ -0,0 +1,159 @@
+use std::{fmt::Display, io};
+
+use futures_core::Stream;
+
+use input_event::Event;
+
+pub use error::{CaptureCreationError, CaptureError};
+
+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

@@ -1,4 +1,3 @@
-use anyhow::{anyhow, Result};
 use ashpd::{
     desktop::{
         input_capture::{Activated, Barrier, BarrierID, Capabilities, InputCapture, Region, Zones},
@@ -30,23 +29,26 @@ use tokio::{
 use futures_core::Stream;
 use once_cell::sync::Lazy;
 
-use crate::{
-    capture::InputCapture as LanMouseInputCapture,
-    client::{ClientEvent, ClientHandle, Position},
-    event::{Event, KeyboardEvent, PointerEvent},
+use input_event::{Event, KeyboardEvent, PointerEvent};
+
+use crate::error::{CaptureError, ReisConvertEventStreamError};
+
+use super::{
+    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)>,
+    libei_task: JoinHandle<Result<(), CaptureError>>,
+    event_rx: tokio::sync::mpsc::Receiver<(CaptureHandle, Event)>,
     notify_tx: tokio::sync::mpsc::Sender<ProducerEvent>,
 }
 
@@ -79,9 +81,9 @@ 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 +107,9 @@ 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>, ashpd::Error> {
     let zones = input_capture.zones(session).await?.response()?;
     log::debug!("zones: {zones:?}");
 
@@ -131,7 +133,7 @@ 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
@@ -153,7 +155,7 @@ async fn create_session<'a>(
 async fn connect_to_eis(
     input_capture: &InputCapture<'_>,
     session: &Session<'_>,
-) -> Result<(ei::Context, EiConvertEventStream)> {
+) -> Result<(ei::Context, EiConvertEventStream), CaptureError> {
     log::debug!("connect_to_eis");
     let fd = input_capture.connect_to_eis(session).await?;
 
@@ -164,17 +166,13 @@ async fn connect_to_eis(
     // create ei context
     let context = ei::Context::new(stream)?;
     let mut event_stream = EiEventStream::new(context.clone())?;
-    let response = match reis::tokio::ei_handshake(
+    let response = reis::tokio::ei_handshake(
         &mut event_stream,
         "de.feschber.LanMouse",
         ei::handshake::ContextType::Receiver,
         &INTERFACES,
     )
-    .await
-    {
-        Ok(res) => res,
-        Err(e) => return Err(anyhow!("ei handshake failed: {e:?}")),
-    };
+    .await?;
     let event_stream = EiConvertEventStream::new(event_stream, response.serial);
 
     Ok((context, event_stream))
@@ -183,15 +181,15 @@ async fn connect_to_eis(
 async fn libei_event_handler(
     mut ei_event_stream: EiConvertEventStream,
     context: ei::Context,
-    event_tx: Sender<(ClientHandle, Event)>,
-    current_client: Rc<Cell<Option<ClientHandle>>>,
-) -> Result<()> {
+    event_tx: Sender<(CaptureHandle, Event)>,
+    current_client: Rc<Cell<Option<CaptureHandle>>>,
+) -> Result<(), CaptureError> {
     loop {
-        let ei_event = match ei_event_stream.next().await {
-            Some(Ok(event)) => event,
-            Some(Err(e)) => return Err(anyhow!("libei connection closed: {e:?}")),
-            None => return Err(anyhow!("libei connection closed")),
-        };
+        let ei_event = ei_event_stream
+            .next()
+            .await
+            .ok_or(CaptureError::EndOfStream)?
+            .map_err(ReisConvertEventStreamError::from)?;
         log::trace!("from ei: {ei_event:?}");
         let client = current_client.get();
         handle_ei_event(ei_event, client, &context, &event_tx).await;
@@ -200,137 +198,27 @@ async fn libei_event_handler(
 
 async fn wait_for_active_client(
     notify_rx: &mut Receiver<ProducerEvent>,
-    active_clients: &mut Vec<(ClientHandle, Position)>,
-) -> Result<()> {
+    active_clients: &mut Vec<(CaptureHandle, Position)>,
+) {
     // wait for a client update
     while let Some(producer_event) = notify_rx.recv().await {
-        if let ProducerEvent::ClientEvent(c) = producer_event {
-            handle_producer_event(ProducerEvent::ClientEvent(c), active_clients)?;
+        if let ProducerEvent::Create(c, p) = producer_event {
+            handle_producer_event(ProducerEvent::Create(c, p), active_clients);
             break;
         }
     }
-    Ok(())
 }
 
 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?);
+        let first_session = Some(create_session(unsafe { &*input_capture_ptr }).await?);
 
         let (event_tx, event_rx) = tokio::sync::mpsc::channel(32);
-        let (notify_tx, mut notify_rx) = tokio::sync::mpsc::channel(32);
-        let libei_task = tokio::task::spawn_local(async move {
-            /* safety: libei_task does not outlive Self */
-            let input_capture = unsafe { &*input_capture_ptr };
-
-            let mut active_clients: Vec<(ClientHandle, Position)> = vec![];
-            let mut next_barrier_id = 1u32;
-
-            /* there is a bug in xdg-remote-desktop-portal-gnome / mutter that
-             * prevents receiving further events after a session has been disabled once.
-             * Therefore the session needs to recreated when the barriers are updated */
-
-            loop {
-                // otherwise it asks to capture input even with no active clients
-                if active_clients.is_empty() {
-                    wait_for_active_client(&mut notify_rx, &mut active_clients).await?;
-                    continue;
-                }
-
-                let current_client = Rc::new(Cell::new(None));
-
-                // create session
-                let (session, _) = match first_session.take() {
-                    Some(s) => s,
-                    _ => create_session(input_capture).await?,
-                };
-
-                // connect to eis server
-                let (context, ei_event_stream) = connect_to_eis(input_capture, &session).await?;
-
-                // async event task
-                let mut ei_task: JoinHandle<Result<(), anyhow::Error>> =
-                    tokio::task::spawn_local(libei_event_handler(
-                        ei_event_stream,
-                        context,
-                        event_tx.clone(),
-                        current_client.clone(),
-                    ));
-
-                let mut activated = input_capture.receive_activated().await?;
-                let mut zones_changed = input_capture.receive_zones_changed().await?;
-
-                // set barriers
-                let client_for_barrier_id = update_barriers(
-                    input_capture,
-                    &session,
-                    &active_clients,
-                    &mut next_barrier_id,
-                )
-                .await?;
-
-                log::debug!("enabling session");
-                input_capture.enable(&session).await?;
-
-                loop {
-                    tokio::select! {
-                        activated = activated.next() => {
-                            let activated = activated.ok_or(anyhow!("error receiving activation token"))?;
-                            log::debug!("activated: {activated:?}");
-
-                            let client = *client_for_barrier_id
-                                .get(&activated.barrier_id())
-                                .expect("invalid barrier id");
-                            current_client.replace(Some(client));
-
-                            event_tx.send((client, Event::Enter())).await?;
-
-                            tokio::select! {
-                                producer_event = notify_rx.recv() => {
-                                    let producer_event = producer_event.expect("channel closed");
-                                    if handle_producer_event(producer_event, &mut active_clients)? {
-                                        break; /* clients updated */
-                                    }
-                                }
-                                zones_changed = zones_changed.next() => {
-                                    log::debug!("zones changed: {zones_changed:?}");
-                                    break;
-                                }
-                                res = &mut ei_task => {
-                                    if let Err(e) = res.expect("ei task paniced") {
-                                        log::warn!("libei task exited: {e}");
-                                    }
-                                    break;
-                                }
-                            }
-                            release_capture(
-                                input_capture,
-                                &session,
-                                activated,
-                                client,
-                                &active_clients,
-                            ).await?;
-                        }
-                        producer_event = notify_rx.recv() => {
-                            let producer_event = producer_event.expect("channel closed");
-                            if handle_producer_event(producer_event, &mut active_clients)? {
-                                /* clients updated */
-                                break;
-                            }
-                        },
-                        res = &mut ei_task => {
-                            if let Err(e) = res.expect("ei task paniced") {
-                                log::warn!("libei task exited: {e}");
-                            }
-                            break;
-                        }
-                    }
-                }
-                ei_task.abort();
-                input_capture.disable(&session).await?;
-            }
-        });
+        let (notify_tx, notify_rx) = tokio::sync::mpsc::channel(32);
+        let capture = do_capture(input_capture_ptr, notify_rx, first_session, event_tx);
+        let libei_task = tokio::task::spawn_local(capture);
 
         let producer = Self {
             input_capture,
@@ -343,13 +231,139 @@ impl<'a> LibeiInputCapture<'a> {
     }
 }
 
+async fn do_capture<'a>(
+    input_capture_ptr: *const InputCapture<'static>,
+    mut notify_rx: Receiver<ProducerEvent>,
+    mut first_session: Option<(Session<'a>, BitFlags<Capabilities>)>,
+    event_tx: Sender<(CaptureHandle, Event)>,
+) -> Result<(), CaptureError> {
+    /* safety: libei_task does not outlive Self */
+    let input_capture = unsafe { &*input_capture_ptr };
+
+    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
+     * prevents receiving further events after a session has been disabled once.
+     * Therefore the session needs to recreated when the barriers are updated */
+
+    loop {
+        // otherwise it asks to capture input even with no active clients
+        if active_clients.is_empty() {
+            wait_for_active_client(&mut notify_rx, &mut active_clients).await;
+            if notify_rx.is_closed() {
+                break Ok(());
+            } else {
+                continue;
+            }
+        }
+
+        let current_client = Rc::new(Cell::new(None));
+
+        // create session
+        let (session, _) = match first_session.take() {
+            Some(s) => s,
+            _ => create_session(input_capture).await?,
+        };
+
+        // connect to eis server
+        let (context, ei_event_stream) = connect_to_eis(input_capture, &session).await?;
+
+        // async event task
+        let mut ei_task: JoinHandle<Result<(), CaptureError>> =
+            tokio::task::spawn_local(libei_event_handler(
+                ei_event_stream,
+                context,
+                event_tx.clone(),
+                current_client.clone(),
+            ));
+
+        let mut activated = input_capture.receive_activated().await?;
+        let mut zones_changed = input_capture.receive_zones_changed().await?;
+
+        // set barriers
+        let client_for_barrier_id = update_barriers(
+            input_capture,
+            &session,
+            &active_clients,
+            &mut next_barrier_id,
+        )
+        .await?;
+
+        log::debug!("enabling session");
+        input_capture.enable(&session).await?;
+
+        loop {
+            tokio::select! {
+                activated = activated.next() => {
+                    let activated = activated.ok_or(CaptureError::ActivationClosed)?;
+                    log::debug!("activated: {activated:?}");
+
+                    let client = *client_for_barrier_id
+                        .get(&activated.barrier_id())
+                        .expect("invalid barrier id");
+                    current_client.replace(Some(client));
+
+                    if event_tx.send((client, Event::Enter())).await.is_err() {
+                        break;
+                    };
+
+                    tokio::select! {
+                        producer_event = notify_rx.recv() => {
+                            let producer_event = producer_event.expect("channel closed");
+                            if handle_producer_event(producer_event, &mut active_clients) {
+                                break; /* clients updated */
+                            }
+                        }
+                        zones_changed = zones_changed.next() => {
+                            log::debug!("zones changed: {zones_changed:?}");
+                            break;
+                        }
+                        res = &mut ei_task => {
+                            if let Err(e) = res.expect("ei task paniced") {
+                                log::warn!("libei task exited: {e}");
+                            }
+                            break;
+                        }
+                    }
+                    release_capture(
+                        input_capture,
+                        &session,
+                        activated,
+                        client,
+                        &active_clients,
+                    ).await?;
+                }
+                producer_event = notify_rx.recv() => {
+                    let producer_event = producer_event.expect("channel closed");
+                    if handle_producer_event(producer_event, &mut active_clients) {
+                        /* clients updated */
+                        break;
+                    }
+                },
+                res = &mut ei_task => {
+                    if let Err(e) = res.expect("ei task paniced") {
+                        log::warn!("libei task exited: {e}");
+                    }
+                    break;
+                }
+            }
+        }
+        ei_task.abort();
+        input_capture.disable(&session).await?;
+        if event_tx.is_closed() {
+            break Ok(());
+        }
+    }
+}
+
 async fn release_capture(
     input_capture: &InputCapture<'_>,
     session: &Session<'_>,
     activated: Activated,
-    current_client: ClientHandle,
-    active_clients: &[(ClientHandle, Position)],
-) -> Result<()> {
+    current_client: CaptureHandle,
+    active_clients: &[(CaptureHandle, Position)],
+) -> Result<(), CaptureError> {
     log::debug!("releasing input capture {}", activated.activation_id());
     let (x, y) = activated.cursor_position();
     let pos = active_clients
@@ -375,28 +389,27 @@ async fn release_capture(
 
 fn handle_producer_event(
     producer_event: ProducerEvent,
-    active_clients: &mut Vec<(ClientHandle, Position)>,
-) -> Result<bool> {
+    active_clients: &mut Vec<(CaptureHandle, Position)>,
+) -> bool {
     log::debug!("handling event: {producer_event:?}");
-    let updated = match producer_event {
+    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
         }
-    };
-    Ok(updated)
+    }
 }
 
 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) => {
@@ -439,8 +452,8 @@ async fn handle_ei_event(
         EiEvent::PointerMotion(motion) => {
             let motion_event = PointerEvent::Motion {
                 time: motion.time as u32,
-                relative_x: motion.dx as f64,
-                relative_y: motion.dy as f64,
+                dx: motion.dx as f64,
+                dy: motion.dy as f64,
             };
             if let Some(current_client) = current_client {
                 event_tx
@@ -545,12 +558,18 @@ 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::ClientEvent(event)).await;
-            log::debug!("done !");
+            let _ = notify_tx.send(ProducerEvent::Create(handle, pos)).await;
+        });
+        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 +577,6 @@ 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 +584,7 @@ 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,
@@ -103,14 +102,15 @@ struct State {
     pointer_lock: Option<ZwpLockedPointerV1>,
     rel_pointer: Option<ZwpRelativePointerV1>,
     shortcut_inhibitor: Option<ZwpKeyboardShortcutsInhibitorV1>,
-    client_for_window: Vec<(Rc<Window>, ClientHandle)>,
-    focused: Option<(Rc<Window>, ClientHandle)>,
+    client_for_window: Vec<(Rc<Window>, CaptureHandle)>,
+    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,
 }
 
 struct Inner {
@@ -257,64 +257,37 @@ fn draw(f: &mut File, (width, height): (u32, u32)) {
 }
 
 impl WaylandInputCapture {
-    pub fn new() -> Result<Self> {
-        let conn = match Connection::connect_to_env() {
-            Ok(c) => c,
-            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:?}")),
-        };
+    pub fn new() -> std::result::Result<Self, LayerShellCaptureCreationError> {
+        let conn = Connection::connect_to_env()?;
+        let (g, mut queue) = registry_queue_init::<State>(&conn)?;
 
         let qh = queue.handle();
 
-        let compositor: wl_compositor::WlCompositor = match g.bind(&qh, 4..=5, ()) {
-            Ok(compositor) => compositor,
-            Err(_) => return Err(anyhow!("wl_compositor >= v4 not supported")),
-        };
-
-        let xdg_output_manager: ZxdgOutputManagerV1 = match g.bind(&qh, 1..=3, ()) {
-            Ok(xdg_output_manager) => xdg_output_manager,
-            Err(_) => return Err(anyhow!("xdg_output not supported!")),
-        };
-
-        let shm: wl_shm::WlShm = match g.bind(&qh, 1..=1, ()) {
-            Ok(wl_shm) => wl_shm,
-            Err(_) => return Err(anyhow!("wl_shm v1 not supported")),
-        };
-
-        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 compositor: wl_compositor::WlCompositor = g
+            .bind(&qh, 4..=5, ())
+            .map_err(|e| WaylandBindError::new(e, "wl_compositor 4..=5"))?;
+        let xdg_output_manager: ZxdgOutputManagerV1 = g
+            .bind(&qh, 1..=3, ())
+            .map_err(|e| WaylandBindError::new(e, "xdg_output_manager 1..=3"))?;
+        let shm: wl_shm::WlShm = g
+            .bind(&qh, 1..=1, ())
+            .map_err(|e| WaylandBindError::new(e, "wl_shm"))?;
+        let layer_shell: ZwlrLayerShellV1 = g
+            .bind(&qh, 3..=4, ())
+            .map_err(|e| WaylandBindError::new(e, "wlr_layer_shell 3..=4"))?;
+        let seat: wl_seat::WlSeat = g
+            .bind(&qh, 7..=8, ())
+            .map_err(|e| WaylandBindError::new(e, "wl_seat 7..=8"))?;
 
+        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 {
@@ -351,6 +324,7 @@ impl WaylandInputCapture {
             read_guard: None,
             pending_events: VecDeque::new(),
             output_info: vec![],
+            scroll_discrete_pending: false,
         };
 
         // dispatch registry to () again, in order to read all wl_outputs
@@ -393,11 +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
@@ -495,7 +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:?}");
@@ -588,15 +562,13 @@ impl Inner {
 }
 
 impl InputCapture for WaylandInputCapture {
-    fn notify(&mut self, client_event: ClientEvent) -> io::Result<()> {
-        match client_event {
-            ClientEvent::Create(handle, pos) => {
-                self.add_client(handle, pos);
-            }
-            ClientEvent::Destroy(handle) => {
-                self.delete_client(handle);
-            }
-        }
+    fn create(&mut self, handle: CaptureHandle, pos: Position) -> io::Result<()> {
+        self.add_client(handle, pos);
+        let inner = self.0.get_mut();
+        inner.flush_events()
+    }
+    fn destroy(&mut self, handle: CaptureHandle) -> io::Result<()> {
+        self.delete_client(handle);
         let inner = self.0.get_mut();
         inner.flush_events()
     }
@@ -610,7 +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() {
@@ -752,17 +724,25 @@ impl Dispatch<WlPointer, ()> for State {
             }
             wl_pointer::Event::Axis { time, axis, value } => {
                 let (_, client) = app.focused.as_ref().unwrap();
-                app.pending_events.push_back((
-                    *client,
-                    Event::Pointer(PointerEvent::Axis {
-                        time,
-                        axis: u32::from(axis) as u8,
-                        value,
-                    }),
-                ));
+                if app.scroll_discrete_pending {
+                    // each axisvalue120 event is coupled with
+                    // a corresponding axis event, which needs to
+                    // be ignored to not duplicate the scrolling
+                    app.scroll_discrete_pending = false;
+                } else {
+                    app.pending_events.push_back((
+                        *client,
+                        Event::Pointer(PointerEvent::Axis {
+                            time,
+                            axis: u32::from(axis) as u8,
+                            value,
+                        }),
+                    ));
+                }
             }
             wl_pointer::Event::AxisValue120 { axis, value120 } => {
                 let (_, client) = app.focused.as_ref().unwrap();
+                app.scroll_discrete_pending = true;
                 app.pending_events.push_back((
                     *client,
                     Event::Pointer(PointerEvent::AxisDiscrete120 {
@@ -857,21 +837,16 @@ impl Dispatch<ZwpRelativePointerV1, ()> for State {
         if let zwp_relative_pointer_v1::Event::RelativeMotion {
             utime_hi,
             utime_lo,
-            dx: _,
-            dy: _,
-            dx_unaccel: surface_x,
-            dy_unaccel: surface_y,
+            dx_unaccel: dx,
+            dy_unaccel: dy,
+            ..
         } = event
         {
             if let Some((_window, client)) = &app.focused {
                 let time = (((utime_hi as u64) << 32 | utime_lo as u64) / 1000) as u32;
                 app.pending_events.push_back((
                     *client,
-                    Event::Pointer(PointerEvent::Motion {
-                        time,
-                        relative_x: surface_x,
-                        relative_y: surface_y,
-                    }),
+                    Event::Pointer(PointerEvent::Motion { time, dx, dy }),
                 ));
             }
         }

input-capture/src/windows.rs

@@ -1,4 +1,3 @@
-use anyhow::Result;
 use core::task::{Context, Poll};
 use futures::Stream;
 use once_cell::unsync::Lazy;
@@ -9,7 +8,7 @@ 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 +31,25 @@ use windows::Win32::UI::WindowsAndMessaging::{
     WNDPROC,
 };
 
-use crate::client::Position;
-use crate::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 input_event::{
+    scancode::{self, Linux},
+    Event, KeyboardEvent, PointerEvent, BTN_BACK, BTN_FORWARD, BTN_LEFT, BTN_MIDDLE, BTN_RIGHT,
 };
 
+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 +58,28 @@ 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 +90,10 @@ impl InputCapture for WindowsInputCapture {
     }
 }
 
-static mut EVENT_BUFFER: Vec<ClientEvent> = Vec::new();
-static mut ACTIVE_CLIENT: Option<ClientHandle> = None;
-static mut CLIENT_FOR_POS: Lazy<HashMap<Position, ClientHandle>> = Lazy::new(HashMap::new);
-static mut EVENT_TX: Option<Sender<(ClientHandle, Event)>> = None;
+static mut REQUEST_BUFFER: Mutex<Vec<Request>> = Mutex::new(Vec::new());
+static mut ACTIVE_CLIENT: Option<CaptureHandle> = None;
+static mut CLIENT_FOR_POS: Lazy<HashMap<Position, CaptureHandle>> = Lazy::new(HashMap::new);
+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 +108,7 @@ 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 =
-        unsafe { *std::mem::transmute::<LPARAM, *const MSLLHOOKSTRUCT>(lparam) };
+    let mouse_low_level: MSLLHOOKSTRUCT = unsafe { *(lparam.0 as *const MSLLHOOKSTRUCT) };
     match wparam {
         WPARAM(p) if p == WM_LBUTTONDOWN as usize => Some(PointerEvent::Button {
             time: 0,
@@ -133,15 +144,12 @@ fn to_mouse_event(wparam: WPARAM, lparam: LPARAM) -> Option<PointerEvent> {
             let (x, y) = (mouse_low_level.pt.x, mouse_low_level.pt.y);
             let (ex, ey) = ENTRY_POINT;
             let (dx, dy) = (x - ex, y - ey);
-            Some(PointerEvent::Motion {
-                time: 0,
-                relative_x: dx as f64,
-                relative_y: dy as f64,
-            })
+            let (dx, dy) = (dx as f64, dy as f64);
+            Some(PointerEvent::Motion { time: 0, dx, dy })
         },
         WPARAM(p) if p == WM_MOUSEWHEEL as usize => Some(PointerEvent::AxisDiscrete120 {
             axis: 0,
-            value: -(mouse_low_level.mouseData as i32),
+            value: -(mouse_low_level.mouseData as i32 >> 16),
         }),
         WPARAM(p) if p == WM_XBUTTONDOWN as usize || p == WM_XBUTTONUP as usize => {
             let hb = mouse_low_level.mouseData >> 16;
@@ -167,8 +175,7 @@ fn to_mouse_event(wparam: WPARAM, lparam: LPARAM) -> Option<PointerEvent> {
 }
 
 unsafe fn to_key_event(wparam: WPARAM, lparam: LPARAM) -> Option<KeyboardEvent> {
-    let kybrdllhookstruct: KBDLLHOOKSTRUCT =
-        *std::mem::transmute::<LPARAM, *const KBDLLHOOKSTRUCT>(lparam);
+    let kybrdllhookstruct: KBDLLHOOKSTRUCT = *(lparam.0 as *const KBDLLHOOKSTRUCT);
     let mut scan_code = kybrdllhookstruct.scanCode;
     log::trace!("scan_code: {scan_code}");
     if kybrdllhookstruct.flags.contains(LLKHF_EXTENDED) {
@@ -247,8 +254,7 @@ 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 =
-        unsafe { *std::mem::transmute::<LPARAM, *const MSLLHOOKSTRUCT>(lparam) };
+    let mouse_low_level: MSLLHOOKSTRUCT = *(lparam.0 as *const MSLLHOOKSTRUCT);
     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 +365,6 @@ 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 +543,37 @@ fn message_thread(ready_tx: mpsc::Sender<()>) {
                     x if x == EventType::Release as usize => {
                         ACTIVE_CLIENT.take();
                     }
-                    x if x == EventType::ClientEvent as usize => {
-                        while let Some(event) = EVENT_BUFFER.pop() {
-                            update_clients(event)
+                    x if x == EventType::Request as usize => {
+                        let requests = {
+                            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) {
-    match client_event {
-        ClientEvent::Create(handle, pos) => {
+fn update_clients(request: Request) {
+    match request {
+        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 +592,7 @@ 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 +600,16 @@ 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 +1,47 @@
+[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]
+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 +1,144 @@
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+use reis::tokio::EiConvertEventStreamError;
+use std::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;
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+#[error("error in libei stream: {inner:?}")]
+pub struct ReisConvertStreamError {
+    inner: EiConvertEventStreamError,
+}
+
+#[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+impl From<EiConvertEventStreamError> for ReisConvertStreamError {
+    fn from(e: EiConvertEventStreamError) -> Self {
+        Self { inner: e }
+    }
+}
+
+#[derive(Debug, Error)]
+pub enum EmulationError {
+    #[error("event stream closed")]
+    EndOfStream,
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    #[error("libei error flushing events: `{0}`")]
+    Libei(#[from] reis::event::Error),
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    #[error("")]
+    LibeiConvertStream(#[from] ReisConvertStreamError),
+    #[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")))]
+    #[error("wlroots backend: `{0}`")]
+    Wlroots(#[from] WlrootsEmulationCreationError),
+    #[cfg(all(unix, feature = "libei", not(target_os = "macos")))]
+    #[error("libei backend: `{0}`")]
+    Libei(#[from] LibeiEmulationCreationError),
+    #[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+    #[error("xdg-desktop-portal: `{0}`")]
+    Xdp(#[from] XdpEmulationCreationError),
+    #[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+    #[error("x11: `{0}`")]
+    X11(#[from] X11EmulationCreationError),
+    #[cfg(target_os = "macos")]
+    #[error("macos: `{0}`")]
+    MacOs(#[from] MacOSEmulationCreationError),
+    #[cfg(windows)]
+    #[error("windows: `{0}`")]
+    Windows(#[from] WindowsEmulationCreationError),
+    #[error("capture error")]
+    NoAvailableBackend,
+}
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum WlrootsEmulationCreationError {
+    #[error(transparent)]
+    Connect(#[from] ConnectError),
+    #[error(transparent)]
+    Global(#[from] GlobalError),
+    #[error(transparent)]
+    Wayland(#[from] WaylandError),
+    #[error(transparent)]
+    Bind(#[from] WaylandBindError),
+    #[error(transparent)]
+    Dispatch(#[from] DispatchError),
+    #[error(transparent)]
+    Io(#[from] std::io::Error),
+}
+
+#[cfg(all(unix, feature = "wayland", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+#[error("wayland protocol \"{protocol}\" not supported: {inner}")]
+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 = "libei", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum LibeiEmulationCreationError {
+    #[error(transparent)]
+    Ashpd(#[from] ashpd::Error),
+    #[error(transparent)]
+    Io(#[from] std::io::Error),
+    #[error(transparent)]
+    Handshake(#[from] HandshakeError),
+}
+
+#[cfg(all(unix, feature = "xdg_desktop_portal", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum XdpEmulationCreationError {
+    #[error(transparent)]
+    Ashpd(#[from] ashpd::Error),
+}
+
+#[cfg(all(unix, feature = "x11", not(target_os = "macos")))]
+#[derive(Debug, Error)]
+pub enum X11EmulationCreationError {
+    #[error("could not open display")]
+    OpenDisplay,
+}
+
+#[cfg(target_os = "macos")]
+#[derive(Debug, Error)]
+pub enum MacOSEmulationCreationError {
+    #[error("could not create event source")]
+    EventSourceCreation,
+}
+
+#[cfg(windows)]
+#[derive(Debug, Error)]
+pub enum WindowsEmulationCreationError {}

input-emulation/src/lib.rs

@@ -0,0 +1,139 @@
+use async_trait::async_trait;
+use error::EmulationError;
+use std::fmt::Display;
+
+use input_event::Event;
+
+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 +1,331 @@
+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, ReisConvertStreamError};
+
+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<(), EmulationError>>,
+}
+
+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_handler = ei_event_handler(events, context.clone(), devices.clone());
+        let ei_task = tokio::task::spawn_local(ei_handler);
+
+        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: _, dx, dy } => {
+                    let pointer_device = self.devices.pointer.read().unwrap();
+                    if let Some((d, p)) = pointer_device.as_ref() {
+                        p.motion_relative(dx as f32, dy 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<(), EmulationError> {
+    loop {
+        let event = events
+            .next()
+            .await
+            .ok_or(EmulationError::EndOfStream)?
+            .map_err(ReisConvertStreamError::from)?;
+        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().map_err(|e| io::Error::new(e.kind(), e))?;
+    }
+    Ok(())
+}

input-emulation/src/macos.rs

@@ -1,18 +1,18 @@
-use crate::client::{ClientEvent, ClientHandle};
-use crate::emulate::InputEmulation;
-use crate::event::{Event, KeyboardEvent, PointerEvent};
-use anyhow::{anyhow, Result};
+use super::{error::EmulationError, EmulationHandle, InputEmulation};
 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> {
-        let event_source = match CGEventSource::new(CGEventSourceStateID::CombinedSessionState) {
-            Ok(e) => e,
-            Err(_) => return Err(anyhow!("event source creation failed!")),
-        };
+    pub fn new() -> Result<Self, MacOSEmulationCreationError> {
+        let event_source = CGEventSource::new(CGEventSourceStateID::CombinedSessionState)
+            .map_err(|_| MacOSEmulationCreationError::EventSourceCreation)?;
         let button_state = ButtonState {
             left: false,
             right: false,
@@ -109,14 +107,14 @@ 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 {
-                    time: _,
-                    relative_x,
-                    relative_y,
-                } => {
+                PointerEvent::Motion { time: _, dx, dy } => {
                     // FIXME secondary displays?
                     let (min_x, min_y, max_x, max_y) = unsafe {
                         let display = CGMainDisplayID();
@@ -131,12 +129,12 @@ impl InputEmulation for MacOSEmulation {
                         Some(l) => l,
                         None => {
                             log::warn!("could not get mouse location!");
-                            return;
+                            return Ok(());
                         }
                     };
 
-                    mouse_location.x = (mouse_location.x + relative_x).clamp(min_x, max_x - 1.);
-                    mouse_location.y = (mouse_location.y + relative_y).clamp(min_y, max_y - 1.);
+                    mouse_location.x = (mouse_location.x + dx).clamp(min_x, max_x - 1.);
+                    mouse_location.y = (mouse_location.y + dy).clamp(min_y, max_y - 1.);
 
                     let mut event_type = CGEventType::MouseMoved;
                     if self.button_state.left {
@@ -155,17 +153,11 @@ impl InputEmulation for MacOSEmulation {
                         Ok(e) => e,
                         Err(_) => {
                             log::warn!("mouse event creation failed!");
-                            return;
+                            return Ok(());
                         }
                     };
-                    event.set_integer_value_field(
-                        EventField::MOUSE_EVENT_DELTA_X,
-                        relative_x as i64,
-                    );
-                    event.set_integer_value_field(
-                        EventField::MOUSE_EVENT_DELTA_Y,
-                        relative_y as i64,
-                    );
+                    event.set_integer_value_field(EventField::MOUSE_EVENT_DELTA_X, dx as i64);
+                    event.set_integer_value_field(EventField::MOUSE_EVENT_DELTA_Y, dy as i64);
                     event.post(CGEventTapLocation::HID);
                 }
                 PointerEvent::Button {
@@ -174,27 +166,27 @@ 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 +202,7 @@ impl InputEmulation for MacOSEmulation {
                         Ok(e) => e,
                         Err(()) => {
                             log::warn!("mouse event creation failed!");
-                            return;
+                            return Ok(());
                         }
                     };
                     event.post(CGEventTapLocation::HID);
@@ -226,7 +218,7 @@ 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 +232,7 @@ impl InputEmulation for MacOSEmulation {
                         Ok(e) => e,
                         Err(()) => {
                             log::warn!("scroll event creation failed!");
-                            return;
+                            return Ok(());
                         }
                     };
                     event.post(CGEventTapLocation::HID);
@@ -251,7 +243,7 @@ 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 +257,7 @@ impl InputEmulation for MacOSEmulation {
                         Ok(e) => e,
                         Err(()) => {
                             log::warn!("scroll event creation failed!");
-                            return;
+                            return Ok(());
                         }
                     };
                     event.post(CGEventTapLocation::HID);
@@ -282,7 +274,7 @@ 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 +288,11 @@ 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::{
-    emulate::InputEmulation,
-    event::{KeyboardEvent, PointerEvent},
-    scancode,
+use super::error::{EmulationError, WindowsEmulationCreationError};
+use input_event::{
+    scancode, Event, KeyboardEvent, PointerEvent, BTN_BACK, BTN_FORWARD, BTN_LEFT, BTN_MIDDLE,
+    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 crate::{
-    client::{ClientEvent, ClientHandle},
-    event::Event,
-};
+use super::{EmulationHandle, InputEmulation};
 
 const DEFAULT_REPEAT_DELAY: Duration = Duration::from_millis(500);
 const DEFAULT_REPEAT_INTERVAL: Duration = Duration::from_millis(32);
@@ -33,22 +29,18 @@ 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 {
-                    time: _,
-                    relative_x,
-                    relative_y,
-                } => {
-                    rel_mouse(relative_x as i32, relative_y as i32);
+                PointerEvent::Motion { time: _, dx, dy } => {
+                    rel_mouse(dx as i32, dy as i32);
                 }
                 PointerEvent::Button {
                     time: _,
@@ -81,13 +73,13 @@ impl InputEmulation for WindowsEmulation {
             },
             _ => {}
         }
+        // FIXME
+        Ok(())
     }
 
-    async fn notify(&mut self, _: ClientEvent) {
-        // nothing to do
-    }
+    async fn create(&mut self, _handle: EmulationHandle) {}
 
-    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::emulate::InputEmulation;
+use crate::error::EmulationError;
+
+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, ()) {
-            Ok(wl_seat) => wl_seat,
-            Err(_) => return Err(anyhow!("wl_seat >= v7 not supported")),
-        };
+        let seat: wl_seat::WlSeat = globals
+            .bind(&qh, 7..=8, ())
+            .map_err(|e| WaylandBindError::new(e, "wl_seat 7..=8"))?;
 
-        let vpm: VpManager = globals.bind(&qh, 1..=1, ())?;
-        let vkm: VkManager = globals.bind(&qh, 1..=1, ())?;
+        let vpm: VpManager = globals
+            .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) {
-        if let Some(virtual_input) = self.state.input_for_client.get(&client_handle) {
+    async fn consume(
+        &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() {
-                    if e.kind() == io::ErrorKind::WouldBlock {
+                match self.queue.flush() {
+                    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!(
-                            "can't keep up, discarding event: ({client_handle}) - {event:?}"
-                        );
-                        return;
+                        log::warn!("can't keep up, discarding event: ({handle}) - {event:?}");
+                        return Ok(());
                     }
+                    _ => {}
                 }
             }
-            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 ...");
-                }
-                Err(WaylandError::Io(e)) => {
-                    log::error!("{e}")
-                }
-                Err(WaylandError::Protocol(e)) => {
-                    panic!("wayland protocol violation: {e}")
-                }
-                Ok(()) => {
-                    self.last_flush_failed = false;
+                    log::warn!("can't keep up, discarding event: ({handle}) - {event:?}");
                 }
+                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) {
-        if let ClientEvent::Create(client, _) = client_event {
-            self.state.add_client(client);
-            if let Err(e) = self.queue.flush() {
-                log::error!("{}", e);
-            }
+    async fn create(&mut self, handle: EmulationHandle) {
+        self.state.add_client(handle);
+        if let Err(e) = self.queue.flush() {
+            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 {
@@ -162,11 +177,7 @@ impl VirtualInput {
         match event {
             Event::Pointer(e) => {
                 match e {
-                    PointerEvent::Motion {
-                        time,
-                        relative_x,
-                        relative_y,
-                    } => self.pointer.motion(time, relative_x, relative_y),
+                    PointerEvent::Motion { time, dx, dy } => self.pointer.motion(time, dx, dy),
                     PointerEvent::Button {
                         time,
                         button,
@@ -182,7 +193,8 @@ impl VirtualInput {
                     }
                     PointerEvent::AxisDiscrete120 { axis, value } => {
                         let axis: Axis = (axis as u32).try_into()?;
-                        self.pointer.axis(0, axis, (value / 15) as f64);
+                        self.pointer
+                            .axis_discrete(0, axis, value as f64 / 6., value / 120);
                         self.pointer.frame();
                     }
                     PointerEvent::Frame {} => self.pointer.frame(),

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::{
-    client::ClientHandle,
-    emulate::InputEmulation,
-    event::{
-        Event, KeyboardEvent, PointerEvent, BTN_BACK, BTN_FORWARD, BTN_LEFT, BTN_MIDDLE, BTN_RIGHT,
-    },
+use input_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),
             }
@@ -101,15 +100,11 @@ 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 {
-                    time: _,
-                    relative_x,
-                    relative_y,
-                } => {
-                    self.relative_motion(relative_x as i32, relative_y as i32);
+                PointerEvent::Motion { time: _, dx, dy } => {
+                    self.relative_motion(dx as i32, dy as i32);
                 }
                 PointerEvent::Button {
                     time: _,
@@ -142,11 +137,15 @@ 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

@@ -1,29 +1,30 @@
-use anyhow::Result;
 use ashpd::{
     desktop::{
         remote_desktop::{Axis, DeviceType, KeyState, RemoteDesktop},
         ResponseError, Session,
     },
+    zbus::AsyncDrop,
     WindowIdentifier,
 };
 use async_trait::async_trait;
 
-use crate::{
-    client::ClientEvent,
-    emulate::InputEmulation,
-    event::{
-        Event::{Keyboard, Pointer},
-        KeyboardEvent, PointerEvent,
-    },
+use futures::FutureExt;
+use input_event::{
+    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 +54,7 @@ impl<'a> DesktopPortalEmulation<'a> {
         };
 
         log::debug!("started session");
+        let session = session;
 
         Ok(Self { proxy, session })
     }
@@ -60,21 +62,17 @@ 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 {
-                    time: _,
-                    relative_x,
-                    relative_y,
-                } => {
-                    if let Err(e) = self
-                        .proxy
-                        .notify_pointer_motion(&self.session, relative_x, relative_y)
-                        .await
-                    {
-                        log::warn!("{e}");
-                    }
+                PointerEvent::Motion { time: _, dx, dy } => {
+                    self.proxy
+                        .notify_pointer_motion(&self.session, dx, dy)
+                        .await?;
                 }
                 PointerEvent::Button {
                     time: _,
@@ -85,26 +83,18 @@ impl<'a> InputEmulation for DesktopPortalEmulation<'a> {
                         0 => KeyState::Released,
                         _ => KeyState::Pressed,
                     };
-                    if let Err(e) = self
-                        .proxy
+                    self.proxy
                         .notify_pointer_button(&self.session, button as i32, state)
-                        .await
-                    {
-                        log::warn!("{e}");
-                    }
+                        .await?;
                 }
                 PointerEvent::AxisDiscrete120 { axis, value } => {
                     let axis = match axis {
                         0 => Axis::Vertical,
                         _ => Axis::Horizontal,
                     };
-                    if let Err(e) = self
-                        .proxy
+                    self.proxy
                         .notify_pointer_axis_discrete(&self.session, axis, value)
-                        .await
-                    {
-                        log::warn!("{e}");
-                    }
+                        .await?;
                 }
                 PointerEvent::Axis {
                     time: _,
@@ -119,13 +109,9 @@ impl<'a> InputEmulation for DesktopPortalEmulation<'a> {
                         Axis::Vertical => (0., value),
                         Axis::Horizontal => (value, 0.),
                     };
-                    if let Err(e) = self
-                        .proxy
+                    self.proxy
                         .notify_pointer_axis(&self.session, dx, dy, true)
-                        .await
-                    {
-                        log::warn!("{e}");
-                    }
+                        .await?;
                 }
                 PointerEvent::Frame {} => {}
             },
@@ -140,13 +126,9 @@ impl<'a> InputEmulation for DesktopPortalEmulation<'a> {
                             0 => KeyState::Released,
                             _ => KeyState::Pressed,
                         };
-                        if let Err(e) = self
-                            .proxy
+                        self.proxy
                             .notify_keyboard_keycode(&self.session, key as i32, state)
-                            .await
-                        {
-                            log::warn!("{e}");
-                        }
+                            .await?;
                     }
                     KeyboardEvent::Modifiers { .. } => {
                         // ignore
@@ -155,14 +137,28 @@ 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) {
-        log::debug!("closing remote desktop session");
-        if let Err(e) = self.session.close().await {
-            log::error!("failed to close remote desktop session: {e}");
+impl<'a> AsyncDrop for DesktopPortalEmulation<'a> {
+    #[doc = r" Perform the async cleanup."]
+    #[must_use]
+    #[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]
+futures-core = "0.3.30"
+log = "0.4.22"
+num_enum = "0.7.2"
+serde = { version = "1.0", features = ["derive"] }
+thiserror = "1.0.61"

input-event/src/error.rs

@@ -0,0 +1,17 @@
+use std::array::TryFromSliceError;
+
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum ProtocolError {
+    #[error(transparent)]
+    MissingData(#[from] TryFromSliceError),
+    #[error("invalid event id: `{0}`")]
+    InvalidEventId(u8),
+    #[error("invalid pointer event type: `{0}`")]
+    InvalidPointerEventId(u8),
+    #[error("invalid keyboard event type: `{0}`")]
+    InvalidKeyboardEventId(u8),
+    #[error("expected data at idx `{0:?}`")]
+    Data(String),
+}

input-event/src/lib.rs

@@ -0,0 +1,143 @@
+pub use error::ProtocolError;
+use std::fmt::{self, Display};
+
+pub mod error;
+pub mod proto;
+pub mod scancode;
+
+// FIXME
+pub const BTN_LEFT: u32 = 0x110;
+pub const BTN_RIGHT: u32 = 0x111;
+pub const BTN_MIDDLE: u32 = 0x112;
+pub const BTN_BACK: u32 = 0x113;
+pub const BTN_FORWARD: u32 = 0x114;
+
+#[derive(Debug, PartialEq, Clone, Copy)]
+pub enum PointerEvent {
+    /// relative motion event
+    Motion { time: u32, dx: f64, dy: f64 },
+    /// mouse button event
+    Button { time: u32, button: u32, state: u32 },
+    /// axis event, scroll event for touchpads
+    Axis { time: u32, axis: u8, value: f64 },
+    /// discrete axis event, scroll event for mice - 120 = one scroll tick
+    AxisDiscrete120 { axis: u8, value: i32 },
+    /// frame event
+    Frame {},
+}
+
+#[derive(Debug, PartialEq, Clone, Copy)]
+pub enum KeyboardEvent {
+    /// a key press / release event
+    Key { time: u32, key: u32, state: u8 },
+    /// modifiers changed state
+    Modifiers {
+        mods_depressed: u32,
+        mods_latched: u32,
+        mods_locked: u32,
+        group: u32,
+    },
+}
+
+#[derive(PartialEq, Debug, Clone, Copy)]
+pub enum Event {
+    /// pointer event (motion / button / axis)
+    Pointer(PointerEvent),
+    /// keyboard events (key / modifiers)
+    Keyboard(KeyboardEvent),
+    /// enter event: request to enter a client.
+    /// The client must release the pointer if it is grabbed
+    /// and reply with a leave event, as soon as its ready to
+    /// receive events
+    Enter(),
+    /// leave event: this client is now ready to receive events and will
+    /// not send any events after until it sends an enter event
+    Leave(),
+    /// ping a client, to see if it is still alive. A client that does
+    /// not respond with a pong event will be assumed to be offline.
+    Ping(),
+    /// response to a ping event: this event signals that a client
+    /// is still alive but must otherwise be ignored
+    Pong(),
+    /// explicit disconnect request. The client will no longer
+    /// send events until the next Enter event. All of its keys should be released.
+    Disconnect(),
+}
+
+impl Display for PointerEvent {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            PointerEvent::Motion { time: _, dx, dy } => write!(f, "motion({dx},{dy})"),
+            PointerEvent::Button {
+                time: _,
+                button,
+                state,
+            } => {
+                let str = match *button {
+                    BTN_LEFT => Some("left"),
+                    BTN_RIGHT => Some("right"),
+                    BTN_MIDDLE => Some("middle"),
+                    BTN_FORWARD => Some("forward"),
+                    BTN_BACK => Some("back"),
+                    _ => None,
+                };
+                if let Some(button) = str {
+                    write!(f, "button({button}, {state})")
+                } else {
+                    write!(f, "button({button}, {state}")
+                }
+            }
+            PointerEvent::Axis {
+                time: _,
+                axis,
+                value,
+            } => write!(f, "scroll({axis}, {value})"),
+            PointerEvent::AxisDiscrete120 { axis, value } => {
+                write!(f, "scroll-120 ({axis}, {value})")
+            }
+            PointerEvent::Frame {} => write!(f, "frame()"),
+        }
+    }
+}
+
+impl Display for KeyboardEvent {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            KeyboardEvent::Key {
+                time: _,
+                key,
+                state,
+            } => {
+                let scan = scancode::Linux::try_from(*key);
+                if let Ok(scan) = scan {
+                    write!(f, "key({scan:?}, {state})")
+                } else {
+                    write!(f, "key({key}, {state})")
+                }
+            }
+            KeyboardEvent::Modifiers {
+                mods_depressed,
+                mods_latched,
+                mods_locked,
+                group,
+            } => write!(
+                f,
+                "modifiers({mods_depressed},{mods_latched},{mods_locked},{group})"
+            ),
+        }
+    }
+}
+
+impl Display for Event {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Event::Pointer(p) => write!(f, "{}", p),
+            Event::Keyboard(k) => write!(f, "{}", k),
+            Event::Enter() => write!(f, "enter"),
+            Event::Leave() => write!(f, "leave"),
+            Event::Ping() => write!(f, "ping"),
+            Event::Pong() => write!(f, "pong"),
+            Event::Disconnect() => write!(f, "disconnect"),
+        }
+    }
+}

input-event/src/proto.rs

@@ -0,0 +1,307 @@
+use std::{fmt::Debug, slice::SliceIndex};
+
+use crate::ProtocolError;
+
+use super::{Event, KeyboardEvent, PointerEvent};
+
+enum PointerEventType {
+    Motion,
+    Button,
+    Axis,
+    AxisDiscrete120,
+    Frame,
+}
+
+enum KeyboardEventType {
+    Key,
+    Modifiers,
+}
+
+enum EventType {
+    Pointer,
+    Keyboard,
+    Enter,
+    Leave,
+    Ping,
+    Pong,
+    Disconnect,
+}
+
+impl Event {
+    fn event_type(&self) -> EventType {
+        match self {
+            Self::Pointer(_) => EventType::Pointer,
+            Self::Keyboard(_) => EventType::Keyboard,
+            Self::Enter() => EventType::Enter,
+            Self::Leave() => EventType::Leave,
+            Self::Ping() => EventType::Ping,
+            Self::Pong() => EventType::Pong,
+            Self::Disconnect() => EventType::Disconnect,
+        }
+    }
+}
+
+impl PointerEvent {
+    fn event_type(&self) -> PointerEventType {
+        match self {
+            Self::Motion { .. } => PointerEventType::Motion,
+            Self::Button { .. } => PointerEventType::Button,
+            Self::Axis { .. } => PointerEventType::Axis,
+            Self::AxisDiscrete120 { .. } => PointerEventType::AxisDiscrete120,
+            Self::Frame { .. } => PointerEventType::Frame,
+        }
+    }
+}
+
+impl KeyboardEvent {
+    fn event_type(&self) -> KeyboardEventType {
+        match self {
+            KeyboardEvent::Key { .. } => KeyboardEventType::Key,
+            KeyboardEvent::Modifiers { .. } => KeyboardEventType::Modifiers,
+        }
+    }
+}
+
+impl TryFrom<u8> for PointerEventType {
+    type Error = ProtocolError;
+
+    fn try_from(value: u8) -> Result<Self, ProtocolError> {
+        match value {
+            x if x == Self::Motion as u8 => Ok(Self::Motion),
+            x if x == Self::Button as u8 => Ok(Self::Button),
+            x if x == Self::Axis as u8 => Ok(Self::Axis),
+            x if x == Self::AxisDiscrete120 as u8 => Ok(Self::AxisDiscrete120),
+            x if x == Self::Frame as u8 => Ok(Self::Frame),
+            _ => Err(ProtocolError::InvalidPointerEventId(value)),
+        }
+    }
+}
+
+impl TryFrom<u8> for KeyboardEventType {
+    type Error = ProtocolError;
+
+    fn try_from(value: u8) -> Result<Self, ProtocolError> {
+        match value {
+            x if x == Self::Key as u8 => Ok(Self::Key),
+            x if x == Self::Modifiers as u8 => Ok(Self::Modifiers),
+            _ => Err(ProtocolError::InvalidKeyboardEventId(value)),
+        }
+    }
+}
+
+impl From<&Event> for Vec<u8> {
+    fn from(event: &Event) -> Self {
+        let event_id = vec![event.event_type() as u8];
+        let event_data = match event {
+            Event::Pointer(p) => p.into(),
+            Event::Keyboard(k) => k.into(),
+            Event::Enter() => vec![],
+            Event::Leave() => vec![],
+            Event::Ping() => vec![],
+            Event::Pong() => vec![],
+            Event::Disconnect() => vec![],
+        };
+        [event_id, event_data].concat()
+    }
+}
+
+impl TryFrom<Vec<u8>> for Event {
+    type Error = ProtocolError;
+
+    fn try_from(value: Vec<u8>) -> Result<Self, ProtocolError> {
+        let event_id = u8::from_be_bytes(value[..1].try_into()?);
+        match event_id {
+            i if i == (EventType::Pointer as u8) => Ok(Event::Pointer(value.try_into()?)),
+            i if i == (EventType::Keyboard as u8) => Ok(Event::Keyboard(value.try_into()?)),
+            i if i == (EventType::Enter as u8) => Ok(Event::Enter()),
+            i if i == (EventType::Leave as u8) => Ok(Event::Leave()),
+            i if i == (EventType::Ping as u8) => Ok(Event::Ping()),
+            i if i == (EventType::Pong as u8) => Ok(Event::Pong()),
+            i if i == (EventType::Disconnect as u8) => Ok(Event::Disconnect()),
+            _ => Err(ProtocolError::InvalidEventId(event_id)),
+        }
+    }
+}
+
+impl From<&PointerEvent> for Vec<u8> {
+    fn from(event: &PointerEvent) -> Self {
+        let id = vec![event.event_type() as u8];
+        let data = match event {
+            PointerEvent::Motion { time, dx, dy } => {
+                let time = time.to_be_bytes();
+                let dx = dx.to_be_bytes();
+                let dy = dy.to_be_bytes();
+                [&time[..], &dx[..], &dy[..]].concat()
+            }
+            PointerEvent::Button {
+                time,
+                button,
+                state,
+            } => {
+                let time = time.to_be_bytes();
+                let button = button.to_be_bytes();
+                let state = state.to_be_bytes();
+                [&time[..], &button[..], &state[..]].concat()
+            }
+            PointerEvent::Axis { time, axis, value } => {
+                let time = time.to_be_bytes();
+                let axis = axis.to_be_bytes();
+                let value = value.to_be_bytes();
+                [&time[..], &axis[..], &value[..]].concat()
+            }
+            PointerEvent::AxisDiscrete120 { axis, value } => {
+                let axis = axis.to_be_bytes();
+                let value = value.to_be_bytes();
+                [&axis[..], &value[..]].concat()
+            }
+            PointerEvent::Frame {} => {
+                vec![]
+            }
+        };
+        [id, data].concat()
+    }
+}
+
+fn decode_u8<I>(data: &[u8], idx: I) -> Result<u8, ProtocolError>
+where
+    I: SliceIndex<[u8], Output = [u8]> + Debug + Clone,
+{
+    let data = data
+        .get(idx.clone())
+        .ok_or(ProtocolError::Data(format!("{:?}", idx)))?;
+    Ok(u8::from_be_bytes(data.try_into()?))
+}
+
+fn decode_u32<I>(data: &[u8], idx: I) -> Result<u32, ProtocolError>
+where
+    I: SliceIndex<[u8], Output = [u8]> + Debug + Clone,
+{
+    let data = data
+        .get(idx.clone())
+        .ok_or(ProtocolError::Data(format!("{:?}", idx)))?;
+    Ok(u32::from_be_bytes(data.try_into()?))
+}
+
+fn decode_i32<I>(data: &[u8], idx: I) -> Result<i32, ProtocolError>
+where
+    I: SliceIndex<[u8], Output = [u8]> + Debug + Clone,
+{
+    let data = data
+        .get(idx.clone())
+        .ok_or(ProtocolError::Data(format!("{:?}", idx)))?;
+    Ok(i32::from_be_bytes(data.try_into()?))
+}
+fn decode_f64<I>(data: &[u8], idx: I) -> Result<f64, ProtocolError>
+where
+    I: SliceIndex<[u8], Output = [u8]> + Debug + Clone,
+{
+    let data = data
+        .get(idx.clone())
+        .ok_or(ProtocolError::Data(format!("{:?}", idx)))?;
+    Ok(f64::from_be_bytes(data.try_into()?))
+}
+
+impl TryFrom<Vec<u8>> for PointerEvent {
+    type Error = ProtocolError;
+
+    fn try_from(data: Vec<u8>) -> Result<Self, ProtocolError> {
+        match data.get(1) {
+            Some(id) => match id.to_owned().try_into()? {
+                PointerEventType::Motion => {
+                    let time = decode_u32(&data, 2..6)?;
+                    let dx = decode_f64(&data, 6..14)?;
+                    let dy = decode_f64(&data, 14..22)?;
+
+                    Ok(Self::Motion { time, dx, dy })
+                }
+                PointerEventType::Button => {
+                    let time = decode_u32(&data, 2..6)?;
+                    let button = decode_u32(&data, 6..10)?;
+                    let state = decode_u32(&data, 10..14)?;
+
+                    Ok(Self::Button {
+                        time,
+                        button,
+                        state,
+                    })
+                }
+                PointerEventType::Axis => {
+                    let time = decode_u32(&data, 2..6)?;
+                    let axis = decode_u8(&data, 6..7)?;
+                    let value = decode_f64(&data, 7..15)?;
+                    Ok(Self::Axis { time, axis, value })
+                }
+                PointerEventType::AxisDiscrete120 => {
+                    let axis = decode_u8(&data, 2..3)?;
+                    let value = decode_i32(&data, 3..7)?;
+                    Ok(Self::AxisDiscrete120 { axis, value })
+                }
+                PointerEventType::Frame => Ok(Self::Frame {}),
+            },
+            None => Err(ProtocolError::Data("0".to_string())),
+        }
+    }
+}
+
+impl From<&KeyboardEvent> for Vec<u8> {
+    fn from(event: &KeyboardEvent) -> Self {
+        let id = vec![event.event_type() as u8];
+        let data = match event {
+            KeyboardEvent::Key { time, key, state } => {
+                let time = time.to_be_bytes();
+                let key = key.to_be_bytes();
+                let state = state.to_be_bytes();
+                [&time[..], &key[..], &state[..]].concat()
+            }
+            KeyboardEvent::Modifiers {
+                mods_depressed,
+                mods_latched,
+                mods_locked,
+                group,
+            } => {
+                let mods_depressed = mods_depressed.to_be_bytes();
+                let mods_latched = mods_latched.to_be_bytes();
+                let mods_locked = mods_locked.to_be_bytes();
+                let group = group.to_be_bytes();
+                [
+                    &mods_depressed[..],
+                    &mods_latched[..],
+                    &mods_locked[..],
+                    &group[..],
+                ]
+                .concat()
+            }
+        };
+        [id, data].concat()
+    }
+}
+
+impl TryFrom<Vec<u8>> for KeyboardEvent {
+    type Error = ProtocolError;
+
+    fn try_from(data: Vec<u8>) -> Result<Self, ProtocolError> {
+        match data.get(1) {
+            Some(id) => match id.to_owned().try_into()? {
+                KeyboardEventType::Key => {
+                    let time = decode_u32(&data, 2..6)?;
+                    let key = decode_u32(&data, 6..10)?;
+                    let state = decode_u8(&data, 10..11)?;
+                    Ok(KeyboardEvent::Key { time, key, state })
+                }
+                KeyboardEventType::Modifiers => {
+                    let mods_depressed = decode_u32(&data, 2..6)?;
+                    let mods_latched = decode_u32(&data, 6..10)?;
+                    let mods_locked = decode_u32(&data, 10..14)?;
+                    let group = decode_u32(&data, 14..18)?;
+                    Ok(KeyboardEvent::Modifiers {
+                        mods_depressed,
+                        mods_latched,
+                        mods_locked,
+                        group,
+                    })
+                }
+            },
+            None => Err(ProtocolError::Data("0".to_string())),
+        }
+    }
+}

input-event/src/scancode.rs

@@ -3,6 +3,8 @@ use serde::{Deserialize, Serialize};
 
 /*
  * https://learn.microsoft.com/en-us/windows/win32/inputdev/about-keyboard-input
+ * https://download.microsoft.com/download/1/6/1/161ba512-40e2-4cc9-843a-923143f3456c/translate.pdf
+ * https://kbd-project.org/docs/scancodes/scancodes-1.html
  */
 #[repr(u32)]
 #[derive(Debug, Clone, Copy, TryFromPrimitive)]
@@ -120,15 +122,15 @@ pub enum Windows {
     KeyF21 = 0x006C,
     KeyF22 = 0x006D,
     KeyF23 = 0x006E,
-    KeyF24 = 0x0076,
+    KeyF24 = 0x0076, // KeyLANG5
     KeypadComma = 0x007E,
     KeyInternational1 = 0x0073,
     KeyInternational2 = 0x0070,
-    KeyInternational3 = 0x007D,
+    KeyInternational3 = 0x007D, // typo in doc -> its Int'l 3 not Int'l 2
     #[allow(dead_code)]
-    KeyInternational4 = 0x0079, // FIXME unused
+    KeyInternational4 = 0x0079,
     #[allow(dead_code)]
-    KeyInternational5 = 0x007B, // FIXME unused
+    KeyInternational5 = 0x007B,
     // KeyInternational6 = 0x005C,
     KeyLANG1 = 0x0072,
     KeyLANG2 = 0x0071,
@@ -141,6 +143,7 @@ pub enum Windows {
     KeyLeftGUI = 0xE05B,
     KeyRightCtrl = 0xE01D,
     KeyRightShift = 0x0036,
+    KeyFakeRightShift = 0xE036,
     KeyRightAlt = 0xE038,
     KeyRightGUI = 0xE05C,
     KeyScanNextTrack = 0xE019,
@@ -293,7 +296,7 @@ pub enum Linux {
     KeyPause = 119,
     KeyScale = 120, /* AL Compiz Scale (Expose) */
     KeyKpcomma = 121,
-    KeyHangeul = 122,
+    KeyHanguel = 122,
     // KEY_HANGUEL = KeyHangeul,
     KeyHanja = 123,
     KeyYen = 124,
@@ -518,16 +521,16 @@ impl TryFrom<Linux> for Windows {
             Linux::KeyKp3 => Ok(Self::Keypad3PageDn),
             Linux::KeyKp0 => Ok(Self::Keypad0Insert),
             Linux::KeyKpDot => Ok(Self::KeypadDot),
-            Linux::KeyZenkakuhankaku => Ok(Self::KeyLANG1), // TODO unsure
-            Linux::Key102nd => Ok(Self::KeyNonUSSlashBar),  // TODO unsure
+            Linux::KeyZenkakuhankaku => Ok(Self::KeyF24), // KeyLANG5
+            Linux::Key102nd => Ok(Self::KeyNonUSSlashBar), // TODO unsure
             Linux::KeyF11 => Ok(Self::KeyF11),
             Linux::KeyF12 => Ok(Self::KeyF12),
-            Linux::KeyRo => Ok(Self::ErrorRollOver), // TODO unsure
-            Linux::KeyKatakana => Ok(Self::KeyLANG1), // TODO unsure
-            Linux::KeyHiragana => Ok(Self::KeyLANG2), // TODO unsure
-            Linux::KeyHenkan => Ok(Self::KeyLANG3),  // TODO unsure
-            Linux::KeyKatakanahiragana => Ok(Self::KeyLANG4), // TODO unsure
-            Linux::KeyMuhenkan => Ok(Self::KeyLANG4), // TODO unsure
+            Linux::KeyRo => Ok(Self::KeyInternational1),
+            Linux::KeyKatakana => Ok(Self::KeyLANG3),
+            Linux::KeyHiragana => Ok(Self::KeyLANG4),
+            Linux::KeyHenkan => Ok(Self::KeyInternational4),
+            Linux::KeyKatakanahiragana => Ok(Self::KeyInternational2),
+            Linux::KeyMuhenkan => Ok(Self::KeyInternational5),
             Linux::KeyKpJpComma => Ok(Self::KeypadComma),
             Linux::KeyKpEnter => Ok(Self::KeypadEnter),
             Linux::KeyRightCtrl => Ok(Self::KeyRightCtrl),
@@ -555,9 +558,9 @@ impl TryFrom<Linux> for Windows {
             Linux::KeyPause => Ok(Self::KeyPause),
             Linux::KeyScale => Err(()), // TODO
             Linux::KeyKpcomma => Ok(Self::KeypadComma),
-            Linux::KeyHangeul => Ok(Self::KeyInternational1), // TODO unsure
-            Linux::KeyHanja => Ok(Self::KeyInternational2),   // TODO unsure
-            Linux::KeyYen => Ok(Self::KeyInternational3),     // TODO unsure
+            Linux::KeyHanguel => Ok(Self::KeyLANG1), // FIXME should be 00F2?
+            Linux::KeyHanja => Ok(Self::KeyLANG2),   // FIXME should be 00F1?
+            Linux::KeyYen => Ok(Self::KeyInternational3),
             Linux::KeyLeftMeta => Ok(Self::KeyLeftGUI),
             Linux::KeyRightmeta => Ok(Self::KeyRightGUI),
             Linux::KeyCompose => Ok(Self::KeyApplication),
@@ -807,21 +810,22 @@ impl TryFrom<Windows> for Linux {
             Windows::KeyF23 => Ok(Self::KeyF23),
             Windows::KeyF24 => Ok(Self::KeyF24),
             Windows::KeypadComma => Ok(Self::KeyKpcomma),
-            Windows::KeyInternational1 => Ok(Self::KeyHangeul),
-            Windows::KeyInternational2 => Ok(Self::KeyHanja),
+            Windows::KeyInternational1 => Ok(Self::KeyRo),
+            Windows::KeyInternational2 => Ok(Self::KeyKatakanahiragana),
             Windows::KeyInternational3 => Ok(Self::KeyYen),
-            Windows::KeyInternational4 => Err(()),
-            Windows::KeyInternational5 => Err(()),
-            Windows::KeyLANG1 => Ok(Self::KeyKatakana),
-            Windows::KeyLANG2 => Ok(Self::KeyHiragana),
-            Windows::KeyLANG3 => Ok(Self::KeyHenkan),
-            Windows::KeyLANG4 => Ok(Self::KeyKatakanahiragana),
+            Windows::KeyInternational4 => Ok(Self::KeyHenkan),
+            Windows::KeyInternational5 => Ok(Self::KeyMuhenkan),
+            Windows::KeyLANG1 => Ok(Self::KeyHanguel),
+            Windows::KeyLANG2 => Ok(Self::KeyHanja),
+            Windows::KeyLANG3 => Ok(Self::KeyKatakana),
+            Windows::KeyLANG4 => Ok(Self::KeyHiragana),
             Windows::KeyLeftCtrl => Ok(Self::KeyLeftCtrl),
             Windows::KeyLeftShift => Ok(Self::KeyLeftShift),
             Windows::KeyLeftAlt => Ok(Self::KeyLeftAlt),
             Windows::KeyLeftGUI => Ok(Self::KeyLeftMeta),
             Windows::KeyRightCtrl => Ok(Self::KeyRightCtrl),
             Windows::KeyRightShift => Ok(Self::KeyRightShift),
+            Windows::KeyFakeRightShift => Ok(Self::KeyRightShift),
             Windows::KeyRightAlt => Ok(Self::KeyRightalt),
             Windows::KeyRightGUI => Ok(Self::KeyRightmeta),
             Windows::KeyScanNextTrack => Ok(Self::KeyNextsong),

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";
-  version = "0.7.0";
+  pname = pname;
+  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::client::{ClientEvent, Position};
-use crate::event::{Event, KeyboardEvent};
+use crate::config::Config;
 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.notify(ClientEvent::Create(1, Position::Right))?;
-    input_capture.notify(ClientEvent::Create(2, Position::Top))?;
-    input_capture.notify(ClientEvent::Create(3, Position::Bottom))?;
+    input_capture.create(0, Position::Left)?;
+    input_capture.create(1, Position::Right)?;
+    input_capture.create(2, Position::Top)?;
+    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!(
@@ -102,6 +103,8 @@ pub struct ClientConfig {
     pub port: u16,
     /// position of a client on screen
     pub pos: Position,
+    /// enter hook
+    pub cmd: Option<String>,
 }
 
 impl Default for ClientConfig {
@@ -111,16 +114,11 @@ impl Default for ClientConfig {
             hostname: Default::default(),
             fix_ips: Default::default(),
             pos: Default::default(),
+            cmd: None,
         }
     }
 }
 
-#[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>,
@@ -26,11 +32,13 @@ 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>>,
     pub port: Option<u16>,
     pub activate_on_startup: Option<bool>,
+    pub enter_hook: Option<String>,
 }
 
 impl ConfigToml {
@@ -50,7 +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)]
@@ -67,16 +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)>,
@@ -92,6 +228,7 @@ pub struct ConfigClient {
     pub port: u16,
     pub pos: Position,
     pub active: bool,
+    pub enter_hook: Option<String>,
 }
 
 const DEFAULT_RELEASE_KEYS: [scancode::Linux; 4] =
@@ -127,33 +264,14 @@ impl Config {
             Ok(c) => Some(c),
         };
 
-        let frontend = match args.frontend {
-            None => match &config_toml {
-                Some(c) => c.frontend.clone(),
-                None => None,
-            },
-            frontend => frontend,
-        };
+        let frontend_arg = args.frontend;
+        let frontend_cfg = config_toml.as_ref().and_then(|c| c.frontend);
+        let frontend = frontend_arg.or(frontend_cfg).unwrap_or_default();
 
-        let frontend = match frontend {
-            #[cfg(feature = "gtk")]
-            None => Frontend::Gtk,
-            #[cfg(not(feature = "gtk"))]
-            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,
-            },
-        };
+        let port = args
+            .port
+            .or(config_toml.as_ref().and_then(|c| c.port))
+            .unwrap_or(DEFAULT_PORT);
 
         log::debug!("{config_toml:?}");
         let release_bind = config_toml
@@ -161,6 +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 {
@@ -183,6 +309,8 @@ impl Config {
         let test_emulation = args.test_emulation;
 
         Ok(Config {
+            capture_backend,
+            emulation_backend,
             daemon,
             frontend,
             clients,
@@ -208,12 +336,14 @@ impl Config {
                     None => c.host_name.clone(),
                 };
                 let active = c.activate_on_startup.unwrap_or(false);
+                let enter_hook = c.enter_hook.clone();
                 ConfigClient {
                     ips,
                     hostname,
                     port,
                     pos: *pos,
                     active,
+                    enter_hook,
                 }
             })
             .collect()

src/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::emulate;
-use crate::event::{Event, PointerEvent};
+use crate::config::Config;
 use anyhow::Result;
+use input_event::{Event, PointerEvent};
 use std::f64::consts::PI;
 use std::time::{Duration, Instant};
 use tokio::task::LocalSet;
@@ -13,36 +12,34 @@ 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<()> {
-    let mut emulation = emulate::create().await;
-    emulation
-        .notify(ClientEvent::Create(0, Position::Left))
-        .await;
+async fn input_emulation_test(config: Config) -> Result<()> {
+    let backend = config.emulation_backend.map(|b| b.into());
+    let mut emulation = input_emulation::create(backend).await?;
+    emulation.create(0).await;
     let start = Instant::now();
     let mut offset = (0, 0);
     loop {
-        tokio::select! {
-            _ = emulation.dispatch() => {}
-            _ = tokio::time::sleep(Duration::from_millis(1)) => {
-                let elapsed = start.elapsed();
-                let elapsed_sec_f64 = elapsed.as_secs_f64();
-                let second_fraction = elapsed_sec_f64 - elapsed_sec_f64 as u64 as f64;
-                let radians = second_fraction * 2. * PI * FREQUENCY_HZ;
-                let new_offset_f = (radians.cos() * RADIUS * 2., (radians * 2.).sin() * RADIUS);
-                let new_offset = (new_offset_f.0 as i32, new_offset_f.1 as i32);
-                if new_offset != offset {
-                    let relative_motion = (new_offset.0 - offset.0, new_offset.1 - offset.1);
-                    offset = new_offset;
-                    let (relative_x, relative_y) = (relative_motion.0 as f64, relative_motion.1 as f64);
-                    emulation.consume(Event::Pointer(PointerEvent::Motion {time: 0, relative_x, relative_y }), 0).await;
-                }
-            }
+        tokio::time::sleep(Duration::from_millis(1)).await;
+        let elapsed = start.elapsed();
+        let elapsed_sec_f64 = elapsed.as_secs_f64();
+        let second_fraction = elapsed_sec_f64 - elapsed_sec_f64 as u64 as f64;
+        let radians = second_fraction * 2. * PI * FREQUENCY_HZ;
+        let new_offset_f = (radians.cos() * RADIUS * 2., (radians * 2.).sin() * RADIUS);
+        let new_offset = (new_offset_f.0 as i32, new_offset_f.1 as i32);
+        if new_offset != offset {
+            let relative_motion = (new_offset.0 - offset.0, new_offset.1 - offset.1);
+            offset = new_offset;
+            let (dx, dy) = (relative_motion.0 as f64, relative_motion.1 as f64);
+            let event = Event::Pointer(PointerEvent::Motion { time: 0, dx, dy });
+            emulation.consume(event, 0).await?;
         }
     }
 }

src/event.rs

@@ -1,586 +0,0 @@
-use crate::scancode;
-use anyhow::{anyhow, Result};
-use std::{
-    error::Error,
-    fmt::{self, Display},
-};
-
-// FIXME
-pub const BTN_LEFT: u32 = 0x110;
-pub const BTN_RIGHT: u32 = 0x111;
-pub const BTN_MIDDLE: u32 = 0x112;
-pub const BTN_BACK: u32 = 0x113;
-pub const BTN_FORWARD: u32 = 0x114;
-
-#[derive(Debug, PartialEq, Clone, Copy)]
-pub enum PointerEvent {
-    Motion {
-        time: u32,
-        relative_x: f64,
-        relative_y: f64,
-    },
-    Button {
-        time: u32,
-        button: u32,
-        state: u32,
-    },
-    Axis {
-        time: u32,
-        axis: u8,
-        value: f64,
-    },
-    AxisDiscrete120 {
-        axis: u8,
-        value: i32,
-    },
-    Frame {},
-}
-
-#[derive(Debug, PartialEq, Clone, Copy)]
-pub enum KeyboardEvent {
-    Key {
-        time: u32,
-        key: u32,
-        state: u8,
-    },
-    Modifiers {
-        mods_depressed: u32,
-        mods_latched: u32,
-        mods_locked: u32,
-        group: u32,
-    },
-}
-
-#[derive(PartialEq, Debug, Clone, Copy)]
-pub enum Event {
-    /// pointer event (motion / button / axis)
-    Pointer(PointerEvent),
-    /// keyboard events (key / modifiers)
-    Keyboard(KeyboardEvent),
-    /// enter event: request to enter a client.
-    /// The client must release the pointer if it is grabbed
-    /// and reply with a leave event, as soon as its ready to
-    /// receive events
-    Enter(),
-    /// leave event: this client is now ready to receive events and will
-    /// not send any events after until it sends an enter event
-    Leave(),
-    /// ping a client, to see if it is still alive. A client that does
-    /// not respond with a pong event will be assumed to be offline.
-    Ping(),
-    /// response to a ping event: this event signals that a client
-    /// is still alive but must otherwise be ignored
-    Pong(),
-    /// explicit disconnect request. The client will no longer
-    /// send events until the next Enter event. All of its keys should be released.
-    Disconnect(),
-}
-
-impl Display for PointerEvent {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            PointerEvent::Motion {
-                time: _,
-                relative_x,
-                relative_y,
-            } => write!(f, "motion({relative_x},{relative_y})"),
-            PointerEvent::Button {
-                time: _,
-                button,
-                state,
-            } => {
-                let str = match *button {
-                    BTN_LEFT => Some("left"),
-                    BTN_RIGHT => Some("right"),
-                    BTN_MIDDLE => Some("middle"),
-                    BTN_FORWARD => Some("forward"),
-                    BTN_BACK => Some("back"),
-                    _ => None,
-                };
-                if let Some(button) = str {
-                    write!(f, "button({button}, {state})")
-                } else {
-                    write!(f, "button({button}, {state}")
-                }
-            }
-            PointerEvent::Axis {
-                time: _,
-                axis,
-                value,
-            } => write!(f, "scroll({axis}, {value})"),
-            PointerEvent::AxisDiscrete120 { axis, value } => {
-                write!(f, "scroll-120 ({axis}, {value})")
-            }
-            PointerEvent::Frame {} => write!(f, "frame()"),
-        }
-    }
-}
-
-impl Display for KeyboardEvent {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            KeyboardEvent::Key {
-                time: _,
-                key,
-                state,
-            } => {
-                let scan = scancode::Linux::try_from(*key);
-                if let Ok(scan) = scan {
-                    write!(f, "key({scan:?}, {state})")
-                } else {
-                    write!(f, "key({key}, {state})")
-                }
-            }
-            KeyboardEvent::Modifiers {
-                mods_depressed,
-                mods_latched,
-                mods_locked,
-                group,
-            } => write!(
-                f,
-                "modifiers({mods_depressed},{mods_latched},{mods_locked},{group})"
-            ),
-        }
-    }
-}
-
-impl Display for Event {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Event::Pointer(p) => write!(f, "{}", p),
-            Event::Keyboard(k) => write!(f, "{}", k),
-            Event::Enter() => write!(f, "enter"),
-            Event::Leave() => write!(f, "leave"),
-            Event::Ping() => write!(f, "ping"),
-            Event::Pong() => write!(f, "pong"),
-            Event::Disconnect() => write!(f, "disconnect"),
-        }
-    }
-}
-
-impl Event {
-    fn event_type(&self) -> EventType {
-        match self {
-            Self::Pointer(_) => EventType::Pointer,
-            Self::Keyboard(_) => EventType::Keyboard,
-            Self::Enter() => EventType::Enter,
-            Self::Leave() => EventType::Leave,
-            Self::Ping() => EventType::Ping,
-            Self::Pong() => EventType::Pong,
-            Self::Disconnect() => EventType::Disconnect,
-        }
-    }
-}
-
-impl PointerEvent {
-    fn event_type(&self) -> PointerEventType {
-        match self {
-            Self::Motion { .. } => PointerEventType::Motion,
-            Self::Button { .. } => PointerEventType::Button,
-            Self::Axis { .. } => PointerEventType::Axis,
-            Self::AxisDiscrete120 { .. } => PointerEventType::AxisDiscrete120,
-            Self::Frame { .. } => PointerEventType::Frame,
-        }
-    }
-}
-
-impl KeyboardEvent {
-    fn event_type(&self) -> KeyboardEventType {
-        match self {
-            KeyboardEvent::Key { .. } => KeyboardEventType::Key,
-            KeyboardEvent::Modifiers { .. } => KeyboardEventType::Modifiers,
-        }
-    }
-}
-
-enum PointerEventType {
-    Motion,
-    Button,
-    Axis,
-    AxisDiscrete120,
-    Frame,
-}
-enum KeyboardEventType {
-    Key,
-    Modifiers,
-}
-enum EventType {
-    Pointer,
-    Keyboard,
-    Enter,
-    Leave,
-    Ping,
-    Pong,
-    Disconnect,
-}
-
-impl TryFrom<u8> for PointerEventType {
-    type Error = anyhow::Error;
-
-    fn try_from(value: u8) -> Result<Self> {
-        match value {
-            x if x == Self::Motion as u8 => Ok(Self::Motion),
-            x if x == Self::Button as u8 => Ok(Self::Button),
-            x if x == Self::Axis as u8 => Ok(Self::Axis),
-            x if x == Self::AxisDiscrete120 as u8 => Ok(Self::AxisDiscrete120),
-            x if x == Self::Frame as u8 => Ok(Self::Frame),
-            _ => Err(anyhow!(ProtocolError {
-                msg: format!("invalid pointer event type {}", value),
-            })),
-        }
-    }
-}
-
-impl TryFrom<u8> for KeyboardEventType {
-    type Error = anyhow::Error;
-
-    fn try_from(value: u8) -> Result<Self> {
-        match value {
-            x if x == Self::Key as u8 => Ok(Self::Key),
-            x if x == Self::Modifiers as u8 => Ok(Self::Modifiers),
-            _ => Err(anyhow!(ProtocolError {
-                msg: format!("invalid keyboard event type {}", value),
-            })),
-        }
-    }
-}
-
-impl From<&Event> for Vec<u8> {
-    fn from(event: &Event) -> Self {
-        let event_id = vec![event.event_type() as u8];
-        let event_data = match event {
-            Event::Pointer(p) => p.into(),
-            Event::Keyboard(k) => k.into(),
-            Event::Enter() => vec![],
-            Event::Leave() => vec![],
-            Event::Ping() => vec![],
-            Event::Pong() => vec![],
-            Event::Disconnect() => vec![],
-        };
-        [event_id, event_data].concat()
-    }
-}
-
-#[derive(Debug)]
-struct ProtocolError {
-    msg: String,
-}
-
-impl fmt::Display for ProtocolError {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "Protocol violation: {}", self.msg)
-    }
-}
-impl Error for ProtocolError {}
-
-impl TryFrom<Vec<u8>> for Event {
-    type Error = anyhow::Error;
-
-    fn try_from(value: Vec<u8>) -> Result<Self> {
-        let event_id = u8::from_be_bytes(value[..1].try_into()?);
-        match event_id {
-            i if i == (EventType::Pointer as u8) => Ok(Event::Pointer(value.try_into()?)),
-            i if i == (EventType::Keyboard as u8) => Ok(Event::Keyboard(value.try_into()?)),
-            i if i == (EventType::Enter as u8) => Ok(Event::Enter()),
-            i if i == (EventType::Leave as u8) => Ok(Event::Leave()),
-            i if i == (EventType::Ping as u8) => Ok(Event::Ping()),
-            i if i == (EventType::Pong as u8) => Ok(Event::Pong()),
-            i if i == (EventType::Disconnect as u8) => Ok(Event::Disconnect()),
-            _ => Err(anyhow!(ProtocolError {
-                msg: format!("invalid event_id {}", event_id),
-            })),
-        }
-    }
-}
-
-impl From<&PointerEvent> for Vec<u8> {
-    fn from(event: &PointerEvent) -> Self {
-        let id = vec![event.event_type() as u8];
-        let data = match event {
-            PointerEvent::Motion {
-                time,
-                relative_x,
-                relative_y,
-            } => {
-                let time = time.to_be_bytes();
-                let relative_x = relative_x.to_be_bytes();
-                let relative_y = relative_y.to_be_bytes();
-                [&time[..], &relative_x[..], &relative_y[..]].concat()
-            }
-            PointerEvent::Button {
-                time,
-                button,
-                state,
-            } => {
-                let time = time.to_be_bytes();
-                let button = button.to_be_bytes();
-                let state = state.to_be_bytes();
-                [&time[..], &button[..], &state[..]].concat()
-            }
-            PointerEvent::Axis { time, axis, value } => {
-                let time = time.to_be_bytes();
-                let axis = axis.to_be_bytes();
-                let value = value.to_be_bytes();
-                [&time[..], &axis[..], &value[..]].concat()
-            }
-            PointerEvent::AxisDiscrete120 { axis, value } => {
-                let axis = axis.to_be_bytes();
-                let value = value.to_be_bytes();
-                [&axis[..], &value[..]].concat()
-            }
-            PointerEvent::Frame {} => {
-                vec![]
-            }
-        };
-        [id, data].concat()
-    }
-}
-
-impl TryFrom<Vec<u8>> for PointerEvent {
-    type Error = anyhow::Error;
-
-    fn try_from(data: Vec<u8>) -> Result<Self> {
-        match data.get(1) {
-            Some(id) => {
-                let event_type = match id.to_owned().try_into() {
-                    Ok(event_type) => event_type,
-                    Err(e) => return Err(e),
-                };
-                match event_type {
-                    PointerEventType::Motion => {
-                        let time = match data.get(2..6) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(anyhow!(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 2".into(),
-                                }))
-                            }
-                        };
-                        let relative_x = match data.get(6..14) {
-                            Some(d) => f64::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(anyhow!(ProtocolError {
-                                    msg: "Expected 8 Bytes at index 6".into(),
-                                }))
-                            }
-                        };
-                        let relative_y = match data.get(14..22) {
-                            Some(d) => f64::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(anyhow!(ProtocolError {
-                                    msg: "Expected 8 Bytes at index 14".into(),
-                                }))
-                            }
-                        };
-                        Ok(Self::Motion {
-                            time,
-                            relative_x,
-                            relative_y,
-                        })
-                    }
-                    PointerEventType::Button => {
-                        let time = match data.get(2..6) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(anyhow!(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 2".into(),
-                                }))
-                            }
-                        };
-                        let button = match data.get(6..10) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(anyhow!(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 10".into(),
-                                }))
-                            }
-                        };
-                        let state = match data.get(10..14) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(anyhow!(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 14".into(),
-                                }))
-                            }
-                        };
-                        Ok(Self::Button {
-                            time,
-                            button,
-                            state,
-                        })
-                    }
-                    PointerEventType::Axis => {
-                        let time = match data.get(2..6) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(anyhow!(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 2".into(),
-                                }))
-                            }
-                        };
-                        let axis = match data.get(6) {
-                            Some(d) => *d,
-                            None => {
-                                return Err(anyhow!(ProtocolError {
-                                    msg: "Expected 1 Byte at index 6".into(),
-                                }));
-                            }
-                        };
-                        let value = match data.get(7..15) {
-                            Some(d) => f64::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(anyhow!(ProtocolError {
-                                    msg: "Expected 8 Bytes at index 7".into(),
-                                }));
-                            }
-                        };
-                        Ok(Self::Axis { time, axis, value })
-                    }
-                    PointerEventType::AxisDiscrete120 => {
-                        let axis = match data.get(2) {
-                            Some(d) => *d,
-                            None => {
-                                return Err(anyhow!(ProtocolError {
-                                    msg: "Expected 1 Byte at index 2".into(),
-                                }));
-                            }
-                        };
-                        let value = match data.get(3..7) {
-                            Some(d) => i32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(anyhow!(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 3".into(),
-                                }));
-                            }
-                        };
-                        Ok(Self::AxisDiscrete120 { axis, value })
-                    }
-                    PointerEventType::Frame => Ok(Self::Frame {}),
-                }
-            }
-            None => Err(anyhow!(ProtocolError {
-                msg: "Expected an element at index 0".into(),
-            })),
-        }
-    }
-}
-
-impl From<&KeyboardEvent> for Vec<u8> {
-    fn from(event: &KeyboardEvent) -> Self {
-        let id = vec![event.event_type() as u8];
-        let data = match event {
-            KeyboardEvent::Key { time, key, state } => {
-                let time = time.to_be_bytes();
-                let key = key.to_be_bytes();
-                let state = state.to_be_bytes();
-                [&time[..], &key[..], &state[..]].concat()
-            }
-            KeyboardEvent::Modifiers {
-                mods_depressed,
-                mods_latched,
-                mods_locked,
-                group,
-            } => {
-                let mods_depressed = mods_depressed.to_be_bytes();
-                let mods_latched = mods_latched.to_be_bytes();
-                let mods_locked = mods_locked.to_be_bytes();
-                let group = group.to_be_bytes();
-                [
-                    &mods_depressed[..],
-                    &mods_latched[..],
-                    &mods_locked[..],
-                    &group[..],
-                ]
-                .concat()
-            }
-        };
-        [id, data].concat()
-    }
-}
-
-impl TryFrom<Vec<u8>> for KeyboardEvent {
-    type Error = anyhow::Error;
-
-    fn try_from(data: Vec<u8>) -> Result<Self> {
-        match data.get(1) {
-            Some(id) => {
-                let event_type = match id.to_owned().try_into() {
-                    Ok(event_type) => event_type,
-                    Err(e) => return Err(e),
-                };
-                match event_type {
-                    KeyboardEventType::Key => {
-                        let time = match data.get(2..6) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(anyhow!(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 6".into(),
-                                }))
-                            }
-                        };
-                        let key = match data.get(6..10) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(anyhow!(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 10".into(),
-                                }))
-                            }
-                        };
-                        let state = match data.get(10) {
-                            Some(d) => *d,
-                            None => {
-                                return Err(anyhow!(ProtocolError {
-                                    msg: "Expected 1 Bytes at index 14".into(),
-                                }))
-                            }
-                        };
-                        Ok(KeyboardEvent::Key { time, key, state })
-                    }
-                    KeyboardEventType::Modifiers => {
-                        let mods_depressed = match data.get(2..6) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(anyhow!(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 6".into(),
-                                }))
-                            }
-                        };
-                        let mods_latched = match data.get(6..10) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(anyhow!(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 10".into(),
-                                }))
-                            }
-                        };
-                        let mods_locked = match data.get(10..14) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(anyhow!(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 14".into(),
-                                }))
-                            }
-                        };
-                        let group = match data.get(14..18) {
-                            Some(d) => u32::from_be_bytes(d.try_into()?),
-                            None => {
-                                return Err(anyhow!(ProtocolError {
-                                    msg: "Expected 4 Bytes at index 18".into(),
-                                }))
-                            }
-                        };
-                        Ok(KeyboardEvent::Modifiers {
-                            mods_depressed,
-                            mods_latched,
-                            mods_locked,
-                            group,
-                        })
-                    }
-                }
-            }
-            None => Err(anyhow!(ProtocolError {
-                msg: "Expected an element at index 0".into(),
-            })),
-        }
-    }
-}

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];
-            match rx.read_exact(&mut len) {
-                Ok(_) => (),
+            let len = match rx.read_u64(Endian::Big) {
+                Ok(l) => l,
                 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(&len) {
+        if let Err(e) = stream.write_u64(Endian::Big, bytes.len() as u64) {
             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 {
@@ -55,6 +55,7 @@ impl Server {
                 fix_ips: config_client.ips.into_iter().collect(),
                 port: config_client.port,
                 pos: config_client.pos,
+                cmd: config_client.enter_hook,
             };
             let state = ClientState {
                 active: config_client.active,
@@ -76,7 +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?,
@@ -96,14 +101,16 @@ 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(),

src/server/capture_task.rs

@@ -2,15 +2,13 @@ use anyhow::{anyhow, Result};
 use futures::StreamExt;
 use std::{collections::HashSet, net::SocketAddr};
 
-use tokio::{sync::mpsc::Sender, task::JoinHandle};
+use tokio::{process::Command, sync::mpsc::Sender, task::JoinHandle};
 
-use crate::{
-    capture::{self, InputCapture},
-    client::{ClientEvent, ClientHandle},
-    event::{Event, KeyboardEvent},
-    scancode,
-    server::State,
-};
+use input_capture::{self, error::CaptureCreationError, CaptureHandle, InputCapture, Position};
+
+use input_event::{scancode, Event, KeyboardEvent};
+
+use crate::{client::ClientHandle, config::CaptureBackend, 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
-    ClientEvent(ClientEvent),
+    /// add a capture client
+    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<()> {
@@ -140,6 +142,9 @@ async fn handle_capture_event(
     if start_timer {
         let _ = timer_tx.try_send(());
     }
+    if enter {
+        spawn_hook_command(server, handle);
+    }
     if let Some(addr) = addr {
         if enter {
             let _ = sender_tx.send((Event::Enter(), addr)).await;
@@ -148,3 +153,34 @@ async fn handle_capture_event(
     }
     Ok(())
 }
+
+fn spawn_hook_command(server: &Server, handle: ClientHandle) {
+    let Some(cmd) = server
+        .client_manager
+        .borrow()
+        .get(handle)
+        .and_then(|(c, _)| c.cmd.clone())
+    else {
+        return;
+    };
+    tokio::task::spawn_local(async move {
+        log::info!("spawning command!");
+        let mut child = match Command::new("sh").arg("-c").arg(cmd.as_str()).spawn() {
+            Ok(c) => c,
+            Err(e) => {
+                log::warn!("could not execute cmd: {e}");
+                return;
+            }
+        };
+        match child.wait().await {
+            Ok(s) => {
+                if s.success() {
+                    log::info!("{cmd} exited successfully");
+                } else {
+                    log::warn!("{cmd} exited with {s}");
+                }
+            }
+            Err(e) => log::warn!("{cmd}: {e}"),
+        }
+    });
+}

src/server/emulation_task.rs

@@ -1,25 +1,31 @@
-use anyhow::{anyhow, Result};
 use std::net::SocketAddr;
 
+use thiserror::Error;
 use tokio::{
     sync::mpsc::{Receiver, Sender},
     task::JoinHandle,
 };
 
 use crate::{
-    client::{ClientEvent, ClientHandle},
-    emulate::{self, InputEmulation},
-    event::{Event, KeyboardEvent},
-    scancode,
+    client::{ClientHandle, ClientManager},
+    config::EmulationBackend,
     server::State,
 };
+use input_emulation::{
+    self,
+    error::{EmulationCreationError, EmulationError},
+    EmulationHandle, InputEmulation,
+};
+use input_event::{Event, KeyboardEvent};
 
-use super::{CaptureEvent, Server};
+use super::{network_task::NetworkError, CaptureEvent, Server};
 
 #[derive(Clone, Debug)]
 pub enum EmulationEvent {
-    /// input emulation is notified of a change in client states
-    ClientEvent(ClientEvent),
+    /// create a new client
+    Create(EmulationHandle),
+    /// destroy a client
+    Destroy(EmulationHandle),
     /// input emulation must release keys for client
     ReleaseKeys(ClientHandle),
     /// termination signal
@@ -27,55 +33,75 @@ pub enum EmulationEvent {
 }
 
 pub fn new(
+    backend: Option<EmulationBackend>,
     server: Server,
-    mut udp_rx: Receiver<Result<(Event, SocketAddr)>>,
+    udp_rx: Receiver<Result<(Event, SocketAddr), NetworkError>>,
     sender_tx: Sender<(Event, SocketAddr)>,
     capture_tx: Sender<CaptureEvent>,
     timer_tx: Sender<()>,
-) -> (JoinHandle<Result<()>>, Sender<EmulationEvent>) {
-    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 mut last_ignored = None;
+) -> (
+    JoinHandle<Result<(), LanMouseEmulationError>>,
+    Sender<EmulationEvent>,
+) {
+    let (tx, rx) = tokio::sync::mpsc::channel(32);
+    let emulation_task =
+        emulation_task(backend, rx, server, udp_rx, sender_tx, capture_tx, timer_tx);
+    let emulate_task = tokio::task::spawn_local(emulation_task);
+    (emulate_task, tx)
+}
 
-        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;
-                }
-                emulate_event = rx.recv() => {
-                    match emulate_event {
-                        Some(e) => match e {
-                            EmulationEvent::ClientEvent(e) => emulate.notify(e).await,
-                            EmulationEvent::ReleaseKeys(c) => release_keys(&server, &mut emulate, c).await,
-                            EmulationEvent::Terminate => break,
-                        },
-                        None => break,
+#[derive(Debug, Error)]
+pub enum LanMouseEmulationError {
+    #[error("error creating input-emulation: `{0}`")]
+    Create(#[from] EmulationCreationError),
+    #[error("error emulating input: `{0}`")]
+    Emulate(#[from] EmulationError),
+}
+
+async fn emulation_task(
+    backend: Option<EmulationBackend>,
+    mut rx: Receiver<EmulationEvent>,
+    server: Server,
+    mut udp_rx: Receiver<Result<(Event, SocketAddr), NetworkError>>,
+    sender_tx: Sender<(Event, SocketAddr)>,
+    capture_tx: Sender<CaptureEvent>,
+    timer_tx: Sender<()>,
+) -> Result<(), LanMouseEmulationError> {
+    let backend = backend.map(|b| b.into());
+    let mut emulation = input_emulation::create(backend).await?;
+
+    let mut last_ignored = None;
+    loop {
+        tokio::select! {
+            udp_event = udp_rx.recv() => {
+                let udp_event = match udp_event {
+                    Some(Ok(e)) => e,
+                    Some(Err(e)) => {
+                        log::warn!("network error: {e}");
+                        continue;
                     }
-                }
-                res = emulate.dispatch() => {
-                    res?;
+                    None => break,
+                };
+                handle_udp_rx(&server, &capture_tx, &mut emulation, &sender_tx, &mut last_ignored, udp_event, &timer_tx).await?;
+            }
+            emulate_event = rx.recv() => {
+                match emulate_event {
+                    Some(e) => match e {
+                        EmulationEvent::Create(h) => emulation.create(h).await,
+                        EmulationEvent::Destroy(h) => emulation.destroy(h).await,
+                        EmulationEvent::ReleaseKeys(c) => release_keys(&server, &mut emulation, c).await?,
+                        EmulationEvent::Terminate => break,
+                    },
+                    None => break,
                 }
             }
         }
+    }
 
-        // release potentially still pressed keys
-        let clients = server
-            .client_manager
-            .borrow()
-            .get_client_states()
-            .map(|(h, _)| h)
-            .collect::<Vec<_>>();
-        for client in clients {
-            release_keys(&server, &mut emulate, client).await;
-        }
+    // release potentially still pressed keys
+    release_all_keys(&server, &mut emulation).await?;
 
-        // destroy emulator
-        emulate.destroy().await;
-        anyhow::Ok(())
-    });
-    (emulate_task, tx)
+    Ok(())
 }
 
 async fn handle_udp_rx(
@@ -86,48 +112,25 @@ 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
-    let handle = match server.client_manager.borrow().get_client(addr) {
-        Some(a) => a,
-        None => {
-            if last_ignored.is_none() || last_ignored.is_some() && last_ignored.unwrap() != addr {
-                log::warn!("ignoring events from client {addr}");
-                last_ignored.replace(addr);
-            }
-            return;
-        }
+    log::trace!("{:20} <-<-<-<------ {addr}", event.to_string());
+
+    // get client handle for addr
+    let Some(handle) =
+        activate_client_if_exists(&mut server.client_manager.borrow_mut(), addr, last_ignored)
+    else {
+        return Ok(());
     };
 
-    // next event can be logged as ignored again
-    last_ignored.take();
-
-    log::trace!("{:20} <-<-<-<------ {addr} ({handle})", event.to_string());
-    {
-        let mut client_manager = server.client_manager.borrow_mut();
-        let client_state = match client_manager.get_mut(handle) {
-            Some((_, s)) => s,
-            None => {
-                log::error!("unknown handle");
-                return;
-            }
-        };
-
-        // reset ttl for client and
-        client_state.alive = true;
-        // set addr as new default for this client
-        client_state.active_addr = Some(addr);
-    }
-
     match (event, addr) {
         (Event::Pong(), _) => { /* ignore pong events */ }
         (Event::Ping(), addr) => {
             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
@@ -148,34 +151,26 @@ async fn handle_udp_rx(
                     }
                 }
                 State::Receiving => {
-                    let mut ignore_event = false;
-                    if let Event::Keyboard(KeyboardEvent::Key {
-                        time: _,
-                        key,
-                        state,
-                    }) = event
-                    {
-                        let mut client_manager = server.client_manager.borrow_mut();
-                        let client_state = if let Some((_, s)) = client_manager.get_mut(handle) {
-                            s
+                    let ignore_event =
+                        if let Event::Keyboard(KeyboardEvent::Key { key, state, .. }) = event {
+                            let (ignore_event, restart_timer) = update_client_keys(
+                                &mut server.client_manager.borrow_mut(),
+                                handle,
+                                key,
+                                state,
+                            );
+                            // restart timer if necessary
+                            if restart_timer {
+                                let _ = timer_tx.try_send(());
+                            }
+                            ignore_event
                         } else {
-                            log::error!("unknown handle");
-                            return;
+                            false
                         };
-                        if state == 0 {
-                            // ignore release event if key not pressed
-                            ignore_event = !client_state.pressed_keys.remove(&key);
-                        } else {
-                            // ignore press event if key not released
-                            ignore_event = !client_state.pressed_keys.insert(key);
-                            let _ = timer_tx.try_send(());
-                        }
-                    }
-                    // ignore double press / release events to
                     // 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 +195,30 @@ async fn handle_udp_rx(
             }
         }
     }
+    Ok(())
+}
+
+async fn release_all_keys(
+    server: &Server,
+    emulation: &mut Box<dyn InputEmulation>,
+) -> Result<(), EmulationError> {
+    let clients = server
+        .client_manager
+        .borrow()
+        .get_client_states()
+        .map(|(h, _)| h)
+        .collect::<Vec<_>>();
+    for client in clients {
+        release_keys(server, emulation, client).await?;
+    }
+    Ok(())
 }
 
 async fn release_keys(
     server: &Server,
     emulate: &mut Box<dyn InputEmulation>,
     client: ClientHandle,
-) {
+) -> Result<(), EmulationError> {
     let keys = server
         .client_manager
         .borrow_mut()
@@ -221,19 +233,65 @@ async fn release_keys(
             key,
             state: 0,
         });
-        emulate.consume(event, client).await;
-        if let Ok(key) = scancode::Linux::try_from(key) {
+        emulate.consume(event, client).await?;
+        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
-        .consume(Event::Keyboard(modifiers_event), client)
-        .await;
+    });
+    emulate.consume(event, client).await?;
+    Ok(())
+}
+
+fn activate_client_if_exists(
+    client_manager: &mut ClientManager,
+    addr: SocketAddr,
+    last_ignored: &mut Option<SocketAddr>,
+) -> Option<ClientHandle> {
+    let Some(handle) = client_manager.get_client(addr) else {
+        // log ignored if it is the first event from the client in a series
+        if last_ignored.is_none() || last_ignored.is_some() && last_ignored.unwrap() != addr {
+            log::warn!("ignoring events from client {addr}");
+            last_ignored.replace(addr);
+        }
+        return None;
+    };
+    // next event can be logged as ignored again
+    last_ignored.take();
+
+    let (_, client_state) = client_manager.get_mut(handle)?;
+
+    // reset ttl for client
+    client_state.alive = true;
+    // set addr as new default for this client
+    client_state.active_addr = Some(addr);
+    Some(handle)
+}
+
+fn update_client_keys(
+    client_manager: &mut ClientManager,
+    handle: ClientHandle,
+    key: u32,
+    state: u8,
+) -> (bool, bool) {
+    let Some(client_state) = client_manager.get_mut(handle).map(|(_, s)| s) else {
+        return (true, false);
+    };
+
+    // ignore double press / release events
+    let ignore_event = if state == 0 {
+        // ignore release event if key not pressed
+        !client_state.pressed_keys.remove(&key)
+    } else {
+        // ignore press event if key not released
+        !client_state.pressed_keys.insert(key)
+    };
+    let restart_timer = !client_state.pressed_keys.is_empty();
+    (ignore_event, restart_timer)
 }

src/server/frontend_task.rs

@@ -17,7 +17,7 @@ use tokio::{
 };
 
 use crate::{
-    client::{ClientEvent, ClientHandle, Position},
+    client::{ClientHandle, Position},
     frontend::{self, FrontendEvent, FrontendListener, FrontendRequest},
 };
 
@@ -107,7 +107,8 @@ async fn handle_frontend_event(
     log::debug!("frontend: {event:?}");
     match event {
         FrontendRequest::Create => {
-            add_client(server, frontend).await;
+            let handle = add_client(server, frontend).await;
+            resolve_dns(server, resolve_tx, handle).await;
         }
         FrontendRequest::Activate(handle, active) => {
             if active {
@@ -140,10 +141,12 @@ async fn handle_frontend_event(
             return true;
         }
         FrontendRequest::UpdateFixIps(handle, fix_ips) => {
-            update_fix_ips(server, resolve_tx, handle, fix_ips).await;
+            update_fix_ips(server, handle, fix_ips).await;
+            resolve_dns(server, resolve_tx, handle).await;
         }
         FrontendRequest::UpdateHostname(handle, hostname) => {
             update_hostname(server, resolve_tx, handle, hostname).await;
+            resolve_dns(server, resolve_tx, handle).await;
         }
         FrontendRequest::UpdatePort(handle, port) => {
             update_port(server, handle, port).await;
@@ -152,31 +155,41 @@ async fn handle_frontend_event(
             update_pos(server, handle, capture, emulate, pos).await;
         }
         FrontendRequest::ResolveDns(handle) => {
-            let hostname = server
-                .client_manager
-                .borrow()
-                .get(handle)
-                .and_then(|(c, _)| c.hostname.clone());
-            if let Some(hostname) = hostname {
-                let _ = resolve_tx.send(DnsRequest { hostname, handle }).await;
-            }
+            resolve_dns(server, resolve_tx, handle).await;
         }
     };
     false
 }
 
+async fn resolve_dns(server: &Server, resolve_tx: &Sender<DnsRequest>, handle: ClientHandle) {
+    let hostname = server
+        .client_manager
+        .borrow()
+        .get(handle)
+        .and_then(|(c, _)| c.hostname.clone());
+    if let Some(hostname) = hostname {
+        let _ = resolve_tx
+            .send(DnsRequest {
+                hostname: hostname.clone(),
+                handle,
+            })
+            .await;
+    }
+}
+
 async fn broadcast(frontend: &mut FrontendListener, event: FrontendEvent) {
     if let Err(e) = frontend.broadcast_event(event).await {
         log::error!("error notifying frontend: {e}");
     }
 }
 
-pub async fn add_client(server: &Server, frontend: &mut FrontendListener) {
+pub async fn add_client(server: &Server, frontend: &mut FrontendListener) -> ClientHandle {
     let handle = server.client_manager.borrow_mut().add_client();
     log::info!("added client {handle}");
 
     let (c, s) = server.client_manager.borrow().get(handle).unwrap().clone();
     broadcast(frontend, FrontendEvent::Created(handle, c, s)).await;
+    handle
 }
 
 pub async fn deactivate_client(
@@ -192,9 +205,8 @@ pub async fn deactivate_client(
         None => return,
     };
 
-    let event = ClientEvent::Destroy(handle);
-    let _ = capture.send(CaptureEvent::ClientEvent(event)).await;
-    let _ = emulate.send(EmulationEvent::ClientEvent(event)).await;
+    let _ = capture.send(CaptureEvent::Destroy(handle)).await;
+    let _ = emulate.send(EmulationEvent::Destroy(handle)).await;
 }
 
 pub async fn activate_client(
@@ -224,9 +236,8 @@ pub async fn activate_client(
     };
 
     /* notify emulation, capture and frontends */
-    let event = ClientEvent::Create(handle, pos);
-    let _ = capture.send(CaptureEvent::ClientEvent(event)).await;
-    let _ = emulate.send(EmulationEvent::ClientEvent(event)).await;
+    let _ = capture.send(CaptureEvent::Create(handle, pos.into())).await;
+    let _ = emulate.send(EmulationEvent::Create(handle)).await;
 }
 
 pub async fn remove_client(
@@ -245,31 +256,18 @@ pub async fn remove_client(
     };
 
     if active {
-        let destroy = ClientEvent::Destroy(handle);
-        let _ = capture.send(CaptureEvent::ClientEvent(destroy)).await;
-        let _ = emulate.send(EmulationEvent::ClientEvent(destroy)).await;
+        let _ = capture.send(CaptureEvent::Destroy(handle)).await;
+        let _ = emulate.send(EmulationEvent::Destroy(handle)).await;
     }
 }
 
-async fn update_fix_ips(
-    server: &Server,
-    resolve_tx: &Sender<DnsRequest>,
-    handle: ClientHandle,
-    fix_ips: Vec<IpAddr>,
-) {
-    let hostname = {
-        let mut client_manager = server.client_manager.borrow_mut();
-        let Some((c, _)) = client_manager.get_mut(handle) else {
-            return;
-        };
-
-        c.fix_ips = fix_ips;
-        c.hostname.clone()
+async fn update_fix_ips(server: &Server, handle: ClientHandle, fix_ips: Vec<IpAddr>) {
+    let mut client_manager = server.client_manager.borrow_mut();
+    let Some((c, _)) = client_manager.get_mut(handle) else {
+        return;
     };
 
-    if let Some(hostname) = hostname {
-        let _ = resolve_tx.send(DnsRequest { hostname, handle }).await;
-    }
+    c.fix_ips = fix_ips;
 }
 
 async fn update_hostname(
@@ -334,13 +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::ClientEvent(destroy)).await;
-            let _ = emulate.send(EmulationEvent::ClientEvent(destroy)).await;
+            let _ = capture.send(CaptureEvent::Destroy(handle)).await;
+            let _ = emulate.send(EmulationEvent::Destroy(handle)).await;
         }
-        let create = ClientEvent::Create(handle, pos);
-        let _ = capture.send(CaptureEvent::ClientEvent(create)).await;
-        let _ = emulate.send(EmulationEvent::ClientEvent(create)).await;
+        let _ = capture.send(CaptureEvent::Create(handle, pos.into())).await;
+        let _ = emulate.send(EmulationEvent::Create(handle)).await;
     }
 }
 

src/server/network_task.rs

@@ -1,72 +1,44 @@
-use std::net::SocketAddr;
+use std::{io, net::SocketAddr};
 
-use anyhow::Result;
+use thiserror::Error;
 use tokio::{
     net::UdpSocket,
     sync::mpsc::{Receiver, Sender},
     task::JoinHandle,
 };
 
-use crate::{event::Event, frontend::FrontendEvent};
+use crate::frontend::FrontendEvent;
+use input_event::{Event, ProtocolError};
 
 use super::Server;
 
 pub async fn new(
     server: Server,
     frontend_notify_tx: Sender<FrontendEvent>,
-) -> Result<(
+) -> io::Result<(
     JoinHandle<()>,
     Sender<(Event, SocketAddr)>,
-    Receiver<Result<(Event, SocketAddr)>>,
+    Receiver<Result<(Event, SocketAddr), NetworkError>>,
     Sender<u16>,
 )> {
     // bind the udp socket
     let listen_addr = SocketAddr::new("0.0.0.0".parse().unwrap(), server.port.get());
     let mut socket = UdpSocket::bind(listen_addr).await?;
     let (receiver_tx, receiver_rx) = tokio::sync::mpsc::channel(32);
-    let (sender_tx, mut sender_rx) = tokio::sync::mpsc::channel(32);
+    let (sender_tx, sender_rx) = tokio::sync::mpsc::channel(32);
     let (port_tx, mut port_rx) = tokio::sync::mpsc::channel(32);
 
     let udp_task = tokio::task::spawn_local(async move {
+        let mut sender_rx = sender_rx;
         loop {
+            let udp_receiver = udp_receiver(&socket, &receiver_tx);
+            let udp_sender = udp_sender(&socket, &mut sender_rx);
             tokio::select! {
-                event = receive_event(&socket) => {
-                    let _ = receiver_tx.send(event).await;
-                }
-                event = sender_rx.recv() => {
-                    let Some((event, addr)) = event else {
-                        break;
-                    };
-                    if let Err(e) = send_event(&socket, event, addr) {
-                        log::warn!("udp send failed: {e}");
-                    };
-                }
-                port = port_rx.recv() => {
-                    let Some(port) = port else {
-                        break;
-                    };
-
-                    if socket.local_addr().unwrap().port() == port {
-                        continue;
-                    }
-
-                    let listen_addr = SocketAddr::new("0.0.0.0".parse().unwrap(), port);
-                    match UdpSocket::bind(listen_addr).await {
-                        Ok(new_socket) => {
-                            socket = new_socket;
-                            server.port.replace(port);
-                            let _ = frontend_notify_tx.send(FrontendEvent::PortChanged(port, None)).await;
-                        }
-                        Err(e) => {
-                            log::warn!("could not change port: {e}");
-                            let port = socket.local_addr().unwrap().port();
-                            let _ = frontend_notify_tx.send(FrontendEvent::PortChanged(
-                                    port,
-                                    Some(format!("could not change port: {e}")),
-                                )).await;
-                        }
-                    }
-
+                _ = udp_receiver => break, /* channel closed */
+                _ = udp_sender => break, /* channel closed */
+                port = port_rx.recv() => match port {
+                    Some(port) => update_port(&server, &frontend_notify_tx, &mut socket, port).await,
+                    _ => break,
                 }
             }
         }
@@ -74,13 +46,73 @@ pub async fn new(
     Ok((udp_task, sender_tx, receiver_rx, port_tx))
 }
 
-async fn receive_event(socket: &UdpSocket) -> Result<(Event, SocketAddr)> {
+async fn update_port(
+    server: &Server,
+    frontend_chan: &Sender<FrontendEvent>,
+    socket: &mut UdpSocket,
+    port: u16,
+) {
+    // if port is the same, we dont need to change it
+    if socket.local_addr().unwrap().port() == port {
+        return;
+    }
+
+    // create new socket
+    let listen_addr = SocketAddr::new("0.0.0.0".parse().unwrap(), port);
+    let frontend_event = match UdpSocket::bind(listen_addr).await {
+        Ok(new_socket) => {
+            *socket = new_socket;
+            server.port.replace(port);
+            FrontendEvent::PortChanged(port, None)
+        }
+        Err(e) => {
+            log::warn!("could not change port: {e}");
+            let port = socket.local_addr().unwrap().port();
+            FrontendEvent::PortChanged(port, Some(format!("could not change port: {e}")))
+        }
+    };
+    let _ = frontend_chan.send(frontend_event).await;
+}
+
+async fn udp_receiver(
+    socket: &UdpSocket,
+    receiver_tx: &Sender<Result<(Event, SocketAddr), NetworkError>>,
+) {
+    loop {
+        let event = receive_event(socket).await;
+        if receiver_tx.send(event).await.is_err() {
+            break;
+        }
+    }
+}
+
+async fn udp_sender(socket: &UdpSocket, rx: &mut Receiver<(Event, SocketAddr)>) {
+    loop {
+        let (event, addr) = match rx.recv().await {
+            Some(e) => e,
+            None => return,
+        };
+        if let Err(e) = send_event(socket, event, addr) {
+            log::warn!("udp send failed: {e}");
+        };
+    }
+}
+
+#[derive(Debug, Error)]
+pub(crate) enum NetworkError {
+    #[error(transparent)]
+    Protocol(#[from] ProtocolError),
+    #[error("network error: `{0}`")]
+    Io(#[from] io::Error),
+}
+
+async fn receive_event(socket: &UdpSocket) -> Result<(Event, SocketAddr), NetworkError> {
     let mut buf = vec![0u8; 22];
     let (_amt, src) = socket.recv_from(&mut buf).await?;
     Ok((Event::try_from(buf)?, src))
 }
 
-fn send_event(sock: &UdpSocket, e: Event, addr: SocketAddr) -> Result<usize> {
+fn send_event(sock: &UdpSocket, e: Event, addr: SocketAddr) -> Result<usize, NetworkError> {
     log::trace!("{:20} ------>->->-> {addr}", e.to_string());
     let data: Vec<u8> = (&e).into();
     // When udp blocks, we dont want to block the event loop.

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};