Separate config state (#118)

* change internal api
* frontend now keeps and more correctly reflects backend state

Cargo.toml

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

src/capture/libei.rs

@@ -119,7 +119,7 @@ async fn update_barriers(
         .set_pointer_barriers(session, &barriers, zones.zone_set())
         .await?;
     let response = response.response()?;
-    log::info!("{response:?}");
+    log::debug!("{response:?}");
     Ok(id_map)
 }
 
@@ -132,7 +132,7 @@ impl<'a> Drop for LibeiInputCapture<'a> {
 async fn create_session<'a>(
     input_capture: &'a InputCapture<'a>,
 ) -> Result<(Session<'a>, BitFlags<Capabilities>)> {
-    log::info!("creating input capture session");
+    log::debug!("creating input capture session");
     let (session, capabilities) = loop {
         match input_capture
             .create_session(
@@ -154,7 +154,7 @@ async fn connect_to_eis(
     input_capture: &InputCapture<'_>,
     session: &Session<'_>,
 ) -> Result<(ei::Context, EiConvertEventStream)> {
-    log::info!("connect_to_eis");
+    log::debug!("connect_to_eis");
     let fd = input_capture.connect_to_eis(session).await?;
 
     // create unix stream from fd
@@ -270,7 +270,7 @@ impl<'a> LibeiInputCapture<'a> {
                 )
                 .await?;
 
-                log::info!("enabling session");
+                log::debug!("enabling session");
                 input_capture.enable(&session).await?;
 
                 loop {

src/client.rs

@@ -1,12 +1,16 @@
 use std::{
     collections::HashSet,
+    error::Error,
     fmt::Display,
     net::{IpAddr, SocketAddr},
+    str::FromStr,
 };
 
 use serde::{Deserialize, Serialize};
 use slab::Slab;
 
+use crate::config::DEFAULT_PORT;
+
 #[derive(Debug, Eq, Hash, PartialEq, Clone, Copy, Serialize, Deserialize)]
 pub enum Position {
     Left,
@@ -21,6 +25,33 @@ impl Default for Position {
     }
 }
 
+#[derive(Debug)]
+pub struct PositionParseError {
+    string: String,
+}
+
+impl Display for PositionParseError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "not a valid position: {}", self.string)
+    }
+}
+
+impl Error for PositionParseError {}
+
+impl FromStr for Position {
+    type Err = PositionParseError;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            "left" => Ok(Self::Left),
+            "right" => Ok(Self::Right),
+            "top" => Ok(Self::Top),
+            "bottom" => Ok(Self::Bottom),
+            _ => Err(PositionParseError { string: s.into() }),
+        }
+    }
+}
+
 impl Position {
     pub fn opposite(&self) -> Self {
         match self {
@@ -62,21 +93,28 @@ impl TryFrom<&str> for Position {
 }
 
 #[derive(Debug, Eq, PartialEq, Clone, Serialize, Deserialize)]
-pub struct Client {
+pub struct ClientConfig {
     /// hostname of this client
     pub hostname: Option<String>,
     /// fix ips, determined by the user
     pub fix_ips: Vec<IpAddr>,
-    /// all ip addresses associated with a particular client
-    /// e.g. Laptops usually have at least an ethernet and a wifi port
-    /// which have different ip addresses
-    pub ips: HashSet<IpAddr>,
     /// both active_addr and addrs can be None / empty so port needs to be stored seperately
     pub port: u16,
     /// position of a client on screen
     pub pos: Position,
 }
 
+impl Default for ClientConfig {
+    fn default() -> Self {
+        Self {
+            port: DEFAULT_PORT,
+            hostname: Default::default(),
+            fix_ips: Default::default(),
+            pos: Default::default(),
+        }
+    }
+}
+
 #[derive(Clone, Copy, Debug)]
 pub enum ClientEvent {
     Create(ClientHandle, Position),
@@ -85,10 +123,8 @@ pub enum ClientEvent {
 
 pub type ClientHandle = u64;
 
-#[derive(Debug, Clone)]
+#[derive(Debug, Default, Clone, Serialize, Deserialize)]
 pub struct ClientState {
-    /// information about the client
-    pub client: Client,
     /// events should be sent to and received from the client
     pub active: bool,
     /// `active` address of the client, used to send data to.
@@ -97,12 +133,16 @@ pub struct ClientState {
     pub active_addr: Option<SocketAddr>,
     /// tracks whether or not the client is responding to pings
     pub alive: bool,
+    /// all ip addresses associated with a particular client
+    /// e.g. Laptops usually have at least an ethernet and a wifi port
+    /// which have different ip addresses
+    pub ips: HashSet<IpAddr>,
     /// keys currently pressed by this client
     pub pressed_keys: HashSet<u32>,
 }
 
 pub struct ClientManager {
-    clients: Slab<ClientState>,
+    clients: Slab<(ClientConfig, ClientState)>,
 }
 
 impl Default for ClientManager {
@@ -118,32 +158,10 @@ impl ClientManager {
     }
 
     /// add a new client to this manager
-    pub fn add_client(
-        &mut self,
-        hostname: Option<String>,
-        ips: HashSet<IpAddr>,
-        port: u16,
-        pos: Position,
-        active: bool,
-    ) -> ClientHandle {
-        // store fix ip addresses
-        let fix_ips = ips.iter().cloned().collect();
-
-        let client_state = ClientState {
-            client: Client {
-                hostname,
-                fix_ips,
-                ips,
-                port,
-                pos,
-            },
-            active,
-            active_addr: None,
-            alive: false,
-            pressed_keys: HashSet::new(),
-        };
-
-        self.clients.insert(client_state) as ClientHandle
+    pub fn add_client(&mut self) -> ClientHandle {
+        let client_config = Default::default();
+        let client_state = Default::default();
+        self.clients.insert((client_config, client_state)) as ClientHandle
     }
 
     /// find a client by its address
@@ -152,8 +170,8 @@ impl ClientManager {
         // time this is likely faster than using a HashMap
         self.clients
             .iter()
-            .find_map(|(k, c)| {
-                if c.active && c.client.ips.contains(&addr.ip()) {
+            .find_map(|(k, (_, s))| {
+                if s.active && s.ips.contains(&addr.ip()) {
                     Some(k)
                 } else {
                     None
@@ -165,8 +183,8 @@ impl ClientManager {
     pub fn find_client(&self, pos: Position) -> Option<ClientHandle> {
         self.clients
             .iter()
-            .find_map(|(k, c)| {
-                if c.active && c.client.pos == pos {
+            .find_map(|(k, (c, s))| {
+                if s.active && c.pos == pos {
                     Some(k)
                 } else {
                     None
@@ -176,28 +194,30 @@ impl ClientManager {
     }
 
     /// remove a client from the list
-    pub fn remove_client(&mut self, client: ClientHandle) -> Option<ClientState> {
+    pub fn remove_client(&mut self, client: ClientHandle) -> Option<(ClientConfig, ClientState)> {
         // remove id from occupied ids
         self.clients.try_remove(client as usize)
     }
 
     // returns an immutable reference to the client state corresponding to `client`
-    pub fn get(&self, client: ClientHandle) -> Option<&ClientState> {
-        self.clients.get(client as usize)
+    pub fn get(&self, handle: ClientHandle) -> Option<&(ClientConfig, ClientState)> {
+        self.clients.get(handle as usize)
     }
 
     /// returns a mutable reference to the client state corresponding to `client`
-    pub fn get_mut(&mut self, client: ClientHandle) -> Option<&mut ClientState> {
-        self.clients.get_mut(client as usize)
+    pub fn get_mut(&mut self, handle: ClientHandle) -> Option<&mut (ClientConfig, ClientState)> {
+        self.clients.get_mut(handle as usize)
     }
 
-    pub fn get_client_states(&self) -> impl Iterator<Item = (ClientHandle, &ClientState)> {
+    pub fn get_client_states(
+        &self,
+    ) -> impl Iterator<Item = (ClientHandle, &(ClientConfig, ClientState))> {
         self.clients.iter().map(|(k, v)| (k as ClientHandle, v))
     }
 
     pub fn get_client_states_mut(
         &mut self,
-    ) -> impl Iterator<Item = (ClientHandle, &mut ClientState)> {
+    ) -> impl Iterator<Item = (ClientHandle, &mut (ClientConfig, ClientState))> {
         self.clients.iter_mut().map(|(k, v)| (k as ClientHandle, v))
     }
 }

src/frontend.rs

@@ -1,5 +1,5 @@
 use anyhow::{anyhow, Result};
-use std::{cmp::min, io::ErrorKind, str, time::Duration};
+use std::{cmp::min, io::ErrorKind, net::IpAddr, str, time::Duration};
 
 #[cfg(unix)]
 use std::{
@@ -23,7 +23,7 @@ use tokio::net::TcpStream;
 use serde::{Deserialize, Serialize};
 
 use crate::{
-    client::{Client, ClientHandle, Position},
+    client::{ClientConfig, ClientHandle, ClientState, Position},
     config::{Config, Frontend},
 };
 
@@ -85,10 +85,10 @@ pub fn wait_for_service() -> Result<std::net::TcpStream> {
 
 #[derive(Debug, Eq, PartialEq, Clone, Serialize, Deserialize)]
 pub enum FrontendRequest {
-    /// add a new client
-    Create(Option<String>, u16, Position),
     /// activate/deactivate client
     Activate(ClientHandle, bool),
+    /// add a new client
+    Create,
     /// change the listen port (recreate udp listener)
     ChangePort(u16),
     /// remove a client
@@ -97,24 +97,30 @@ pub enum FrontendRequest {
     Enumerate(),
     /// service shutdown
     Terminate(),
-    /// update a client (hostname, port, position)
-    Update(ClientHandle, Option<String>, u16, Position),
+    /// update hostname
+    UpdateHostname(ClientHandle, Option<String>),
+    /// update port
+    UpdatePort(ClientHandle, u16),
+    /// update position
+    UpdatePosition(ClientHandle, Position),
+    /// update fix-ips
+    UpdateFixIps(ClientHandle, Vec<IpAddr>),
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub enum FrontendEvent {
-    /// the given client was activated
-    Activated(ClientHandle, bool),
     /// a client was created
-    Created(ClientHandle, Client),
+    Created(ClientHandle, ClientConfig, ClientState),
     /// a client was updated
-    Updated(ClientHandle, Client),
+    Updated(ClientHandle, ClientConfig),
+    /// state changed
+    StateChange(ClientHandle, ClientState),
     /// the client was deleted
     Deleted(ClientHandle),
     /// new port, reason of failure (if failed)
     PortChanged(u16, Option<String>),
     /// list of all clients, used for initial state synchronization
-    Enumerate(Vec<(ClientHandle, Client, bool)>),
+    Enumerate(Vec<(ClientHandle, ClientConfig, ClientState)>),
     /// an error occured
     Error(String),
 }
@@ -229,6 +235,7 @@ impl FrontendListener {
         let len = payload.len().to_be_bytes();
         log::debug!("json: {json}, len: {}", payload.len());
 
+        log::debug!("broadcasting event to streams: {:?}", self.tx_streams);
         let mut keep = vec![];
         // TODO do simultaneously
         for tx in self.tx_streams.iter_mut() {

src/frontend/cli.rs

@@ -1,240 +1,347 @@
-use anyhow::{anyhow, Context, Result};
-
-use std::{
-    io::{ErrorKind, Read, Write},
-    str::SplitWhitespace,
-    thread,
+use anyhow::{anyhow, Result};
+use tokio::{
+    io::{AsyncBufReadExt, AsyncReadExt, AsyncWriteExt, BufReader},
+    task::LocalSet,
 };
 
-use crate::{client::Position, config::DEFAULT_PORT};
+#[cfg(windows)]
+use tokio::net::tcp::{ReadHalf, WriteHalf};
+#[cfg(unix)]
+use tokio::net::unix::{ReadHalf, WriteHalf};
+
+use std::io::{self, Write};
+
+use crate::{
+    client::{ClientConfig, ClientHandle, ClientState},
+    config::DEFAULT_PORT,
+};
+
+use self::command::{Command, CommandType};
 
 use super::{FrontendEvent, FrontendRequest};
 
+mod command;
+
 pub fn run() -> Result<()> {
-    let Ok(mut tx) = super::wait_for_service() else {
+    let Ok(stream) = super::wait_for_service() else {
         return Err(anyhow!("Could not connect to lan-mouse-socket"));
     };
 
-    let mut rx = tx.try_clone()?;
+    let runtime = tokio::runtime::Builder::new_current_thread()
+        .enable_io()
+        .enable_time()
+        .build()?;
+    runtime.block_on(LocalSet::new().run_until(async move {
+        stream.set_nonblocking(true)?;
+        #[cfg(unix)]
+        let mut stream = tokio::net::UnixStream::from_std(stream)?;
+        #[cfg(windows)]
+        let mut stream = tokio::net::TcpStream::from_std(stream)?;
+        let (rx, tx) = stream.split();
 
-    let reader = thread::Builder::new()
-        .name("cli-frontend".to_string())
-        .spawn(move || {
-            // all further prompts
-            prompt();
-            loop {
-                let mut buf = String::new();
-                match std::io::stdin().read_line(&mut buf) {
-                    Ok(0) => return,
-                    Ok(len) => {
-                        if let Some(events) = parse_cmd(buf, len) {
-                            for event in events.iter() {
-                                let json = serde_json::to_string(&event).unwrap();
-                                let bytes = json.as_bytes();
-                                let len = bytes.len().to_be_bytes();
-                                if let Err(e) = tx.write(&len) {
-                                    log::error!("error sending message: {e}");
-                                };
-                                if let Err(e) = tx.write(bytes) {
-                                    log::error!("error sending message: {e}");
-                                };
-                                if *event == FrontendRequest::Terminate() {
-                                    return;
-                                }
-                            }
-                            // prompt is printed after the server response is received
-                        } else {
-                            prompt();
-                        }
-                    }
-                    Err(e) => {
-                        if e.kind() != ErrorKind::UnexpectedEof {
-                            log::error!("error reading from stdin: {e}");
-                        }
-                        return;
-                    }
-                }
-            }
-        })?;
-
-    let _ = thread::Builder::new()
-        .name("cli-frontend-notify".to_string())
-        .spawn(move || {
-            loop {
-                // read len
-                let mut len = [0u8; 8];
-                match rx.read_exact(&mut len) {
-                    Ok(()) => (),
-                    Err(e) if e.kind() == ErrorKind::UnexpectedEof => break,
-                    Err(e) => break log::error!("{e}"),
-                };
-                let len = usize::from_be_bytes(len);
-
-                // read payload
-                let mut buf: Vec<u8> = vec![0u8; len];
-                match rx.read_exact(&mut buf[..len]) {
-                    Ok(()) => (),
-                    Err(e) if e.kind() == ErrorKind::UnexpectedEof => break,
-                    Err(e) => break log::error!("{e}"),
-                };
-
-                let notify: FrontendEvent = match serde_json::from_slice(&buf) {
-                    Ok(n) => n,
-                    Err(e) => break log::error!("{e}"),
-                };
-                match notify {
-                    FrontendEvent::Activated(handle, active) => {
-                        if active {
-                            log::info!("client {handle} activated");
-                        } else {
-                            log::info!("client {handle} deactivated");
-                        }
-                    }
-                    FrontendEvent::Created(handle, client) => {
-                        let port = client.port;
-                        let pos = client.pos;
-                        let hostname = client.hostname.as_deref().unwrap_or("");
-                        log::info!("new client ({handle}): {hostname}:{port} - {pos}");
-                    }
-                    FrontendEvent::Updated(handle, client) => {
-                        let port = client.port;
-                        let pos = client.pos;
-                        let hostname = client.hostname.as_deref().unwrap_or("");
-                        log::info!("client ({handle}) updated: {hostname}:{port} - {pos}");
-                    }
-                    FrontendEvent::Deleted(client) => {
-                        log::info!("client ({client}) deleted.");
-                    }
-                    FrontendEvent::Error(e) => {
-                        log::warn!("{e}");
-                    }
-                    FrontendEvent::Enumerate(clients) => {
-                        for (handle, client, active) in clients.into_iter() {
-                            log::info!(
-                                "client ({}) [{}]: active: {}, associated addresses: [{}]",
-                                handle,
-                                client.hostname.as_deref().unwrap_or(""),
-                                if active { "yes" } else { "no" },
-                                client
-                                    .ips
-                                    .into_iter()
-                                    .map(|a| a.to_string())
-                                    .collect::<Vec<String>>()
-                                    .join(", ")
-                            );
-                        }
-                    }
-                    FrontendEvent::PortChanged(port, msg) => match msg {
-                        Some(msg) => log::info!("could not change port: {msg}"),
-                        None => log::info!("port changed: {port}"),
-                    },
-                }
-                prompt();
-            }
-        })?;
-    match reader.join() {
-        Ok(_) => {}
-        Err(e) => {
-            let msg = match (e.downcast_ref::<&str>(), e.downcast_ref::<String>()) {
-                (Some(&s), _) => s,
-                (_, Some(s)) => s,
-                _ => "no panic info",
-            };
-            log::error!("reader thread paniced: {msg}");
-        }
-    }
+        let mut cli = Cli::new(rx, tx);
+        cli.run().await
+    }))?;
     Ok(())
 }
 
-fn prompt() {
+struct Cli<'a> {
+    clients: Vec<(ClientHandle, ClientConfig, ClientState)>,
+    rx: ReadHalf<'a>,
+    tx: WriteHalf<'a>,
+}
+
+impl<'a> Cli<'a> {
+    fn new(rx: ReadHalf<'a>, tx: WriteHalf<'a>) -> Cli<'a> {
+        Self {
+            clients: vec![],
+            rx,
+            tx,
+        }
+    }
+
+    async fn run(&mut self) -> Result<()> {
+        let stdin = tokio::io::stdin();
+        let stdin = BufReader::new(stdin);
+        let mut stdin = stdin.lines();
+
+        /* initial state sync */
+        let request = FrontendRequest::Enumerate();
+        self.send_request(request).await?;
+
+        self.clients = loop {
+            let event = self.await_event().await?;
+            if let FrontendEvent::Enumerate(clients) = event {
+                break clients;
+            }
+        };
+
+        loop {
+            prompt()?;
+            tokio::select! {
+                line = stdin.next_line() => {
+                    let Some(line) = line? else {
+                        break Ok(());
+                    };
+                    let cmd: Command = match line.parse() {
+                        Ok(cmd) => cmd,
+                        Err(e) => {
+                            eprintln!("{e}");
+                            continue;
+                        }
+                    };
+                    self.execute(cmd).await?;
+                }
+                event = self.await_event() => {
+                    let event = event?;
+                    self.handle_event(event);
+                }
+            }
+        }
+    }
+
+    async fn execute(&mut self, cmd: Command) -> Result<()> {
+        match cmd {
+            Command::None => {}
+            Command::Connect(pos, host, port) => {
+                let request = FrontendRequest::Create;
+                self.send_request(request).await?;
+                let handle = loop {
+                    let event = self.await_event().await?;
+                    match event {
+                        FrontendEvent::Created(h, c, s) => {
+                            self.clients.push((h, c, s));
+                            break h;
+                        }
+                        _ => {
+                            self.handle_event(event);
+                            continue;
+                        }
+                    }
+                };
+                for request in [
+                    FrontendRequest::UpdateHostname(handle, Some(host.clone())),
+                    FrontendRequest::UpdatePort(handle, port.unwrap_or(DEFAULT_PORT)),
+                    FrontendRequest::UpdatePosition(handle, pos),
+                ] {
+                    self.send_request(request).await?;
+                    loop {
+                        let event = self.await_event().await?;
+                        self.handle_event(event.clone());
+                        if let FrontendEvent::Updated(_, _) = event {
+                            break;
+                        }
+                    }
+                }
+            }
+            Command::Disconnect(id) => {
+                self.send_request(FrontendRequest::Delete(id)).await?;
+                loop {
+                    let event = self.await_event().await?;
+                    self.handle_event(event.clone());
+                    if let FrontendEvent::Deleted(_) = event {
+                        self.handle_event(event);
+                        break;
+                    }
+                }
+            }
+            Command::Activate(id) => {
+                self.send_request(FrontendRequest::Activate(id, true))
+                    .await?;
+                loop {
+                    let event = self.await_event().await?;
+                    self.handle_event(event.clone());
+                    if let FrontendEvent::StateChange(_, _) = event {
+                        self.handle_event(event);
+                        break;
+                    }
+                }
+            }
+            Command::Deactivate(id) => {
+                self.send_request(FrontendRequest::Activate(id, false))
+                    .await?;
+                loop {
+                    let event = self.await_event().await?;
+                    self.handle_event(event.clone());
+                    if let FrontendEvent::StateChange(_, _) = event {
+                        self.handle_event(event);
+                        break;
+                    }
+                }
+            }
+            Command::List => {
+                self.send_request(FrontendRequest::Enumerate()).await?;
+                loop {
+                    let event = self.await_event().await?;
+                    self.handle_event(event.clone());
+                    if let FrontendEvent::Enumerate(_) = event {
+                        break;
+                    }
+                }
+            }
+            Command::SetHost(handle, host) => {
+                let request = FrontendRequest::UpdateHostname(handle, Some(host.clone()));
+                self.send_request(request).await?;
+                loop {
+                    let event = self.await_event().await?;
+                    self.handle_event(event.clone());
+                    if let FrontendEvent::Updated(_, _) = event {
+                        self.handle_event(event);
+                        break;
+                    }
+                }
+            }
+            Command::SetPort(handle, port) => {
+                let request = FrontendRequest::UpdatePort(handle, port.unwrap_or(DEFAULT_PORT));
+                self.send_request(request).await?;
+                loop {
+                    let event = self.await_event().await?;
+                    self.handle_event(event.clone());
+                    if let FrontendEvent::Updated(_, _) = event {
+                        break;
+                    }
+                }
+            }
+            Command::Help => {
+                for cmd_type in [
+                    CommandType::List,
+                    CommandType::Connect,
+                    CommandType::Disconnect,
+                    CommandType::Activate,
+                    CommandType::Deactivate,
+                    CommandType::SetHost,
+                    CommandType::SetPort,
+                ] {
+                    eprintln!("{}", cmd_type.usage());
+                }
+            }
+        }
+        Ok(())
+    }
+
+    fn find_mut(
+        &mut self,
+        handle: ClientHandle,
+    ) -> Option<&mut (ClientHandle, ClientConfig, ClientState)> {
+        self.clients.iter_mut().find(|(h, _, _)| *h == handle)
+    }
+
+    fn remove(
+        &mut self,
+        handle: ClientHandle,
+    ) -> Option<(ClientHandle, ClientConfig, ClientState)> {
+        let idx = self.clients.iter().position(|(h, _, _)| *h == handle);
+        idx.map(|i| self.clients.swap_remove(i))
+    }
+
+    fn handle_event(&mut self, event: FrontendEvent) {
+        match event {
+            FrontendEvent::Created(h, c, s) => {
+                eprint!("client added ({h}): ");
+                print_config(&c);
+                eprint!(" ");
+                print_state(&s);
+                eprintln!();
+                self.clients.push((h, c, s));
+            }
+            FrontendEvent::Updated(h, c) => {
+                if let Some((_, config, _)) = self.find_mut(h) {
+                    let old_host = config.hostname.clone().unwrap_or("\"\"".into());
+                    let new_host = c.hostname.clone().unwrap_or("\"\"".into());
+                    if old_host != new_host {
+                        eprintln!(
+                            "client {h}: hostname updated ({} -> {})",
+                            old_host, new_host
+                        );
+                    }
+                    if config.port != c.port {
+                        eprintln!("client {h} changed port: {} -> {}", config.port, c.port);
+                    }
+                    if config.fix_ips != c.fix_ips {
+                        eprintln!("client {h} ips updated: {:?}", c.fix_ips)
+                    }
+                    *config = c;
+                }
+            }
+            FrontendEvent::StateChange(h, s) => {
+                if let Some((_, _, state)) = self.find_mut(h) {
+                    if state.active ^ s.active {
+                        eprintln!(
+                            "client {h} {}",
+                            if s.active { "activated" } else { "deactivated" }
+                        );
+                    }
+                    *state = s;
+                }
+            }
+            FrontendEvent::Deleted(h) => {
+                if let Some((h, c, _)) = self.remove(h) {
+                    eprint!("client {h} removed (");
+                    print_config(&c);
+                    eprintln!(")");
+                }
+            }
+            FrontendEvent::PortChanged(p, e) => {
+                if let Some(e) = e {
+                    eprintln!("failed to change port: {e}");
+                } else {
+                    eprintln!("changed port to {p}");
+                }
+            }
+            FrontendEvent::Enumerate(clients) => {
+                self.clients = clients;
+                self.print_clients();
+            }
+            FrontendEvent::Error(e) => {
+                eprintln!("ERROR: {e}");
+            }
+        }
+    }
+
+    fn print_clients(&mut self) {
+        for (h, c, s) in self.clients.iter() {
+            eprint!("client {h}: ");
+            print_config(c);
+            eprint!(" ");
+            print_state(s);
+            eprintln!();
+        }
+    }
+
+    async fn send_request(&mut self, request: FrontendRequest) -> io::Result<()> {
+        let json = serde_json::to_string(&request).unwrap();
+        let bytes = json.as_bytes();
+        let len = bytes.len();
+        self.tx.write_u64(len as u64).await?;
+        self.tx.write_all(bytes).await?;
+        Ok(())
+    }
+
+    async fn await_event(&mut self) -> Result<FrontendEvent> {
+        let len = self.rx.read_u64().await?;
+        let mut buf = vec![0u8; len as usize];
+        self.rx.read_exact(&mut buf).await?;
+        let event: FrontendEvent = serde_json::from_slice(&buf)?;
+        Ok(event)
+    }
+}
+
+fn prompt() -> io::Result<()> {
     eprint!("lan-mouse > ");
-    std::io::stderr().flush().unwrap();
+    std::io::stderr().flush()?;
+    Ok(())
 }
 
-fn parse_cmd(s: String, len: usize) -> Option<Vec<FrontendRequest>> {
-    if len == 0 {
-        return Some(vec![FrontendRequest::Terminate()]);
-    }
-    let mut l = s.split_whitespace();
-    let cmd = l.next()?;
-    let res = match cmd {
-        "help" => {
-            log::info!("list                                                 list clients");
-            log::info!("connect <host> left|right|top|bottom [port]          add a new client");
-            log::info!("disconnect <client>                                  remove a client");
-            log::info!("activate <client>                                    activate a client");
-            log::info!("deactivate <client>                                  deactivate a client");
-            log::info!("exit                                                 exit lan-mouse");
-            log::info!("setport <port>                                       change port");
-            None
-        }
-        "exit" => return Some(vec![FrontendRequest::Terminate()]),
-        "list" => return Some(vec![FrontendRequest::Enumerate()]),
-        "connect" => Some(parse_connect(l)),
-        "disconnect" => Some(parse_disconnect(l)),
-        "activate" => Some(parse_activate(l)),
-        "deactivate" => Some(parse_deactivate(l)),
-        "setport" => Some(parse_port(l)),
-        _ => {
-            log::error!("unknown command: {s}");
-            None
-        }
-    };
-    match res {
-        Some(Ok(e)) => Some(e),
-        Some(Err(e)) => {
-            log::warn!("{e}");
-            None
-        }
-        _ => None,
-    }
+fn print_config(c: &ClientConfig) {
+    eprint!(
+        "{}:{} ({}), ips: {:?}",
+        c.hostname.clone().unwrap_or("(no hostname)".into()),
+        c.port,
+        c.pos,
+        c.fix_ips
+    );
 }
 
-fn parse_connect(mut l: SplitWhitespace) -> Result<Vec<FrontendRequest>> {
-    let usage = "usage: connect <host> left|right|top|bottom [port]";
-    let host = l.next().context(usage)?.to_owned();
-    let pos = match l.next().context(usage)? {
-        "right" => Position::Right,
-        "top" => Position::Top,
-        "bottom" => Position::Bottom,
-        _ => Position::Left,
-    };
-    let port = if let Some(p) = l.next() {
-        p.parse()?
-    } else {
-        DEFAULT_PORT
-    };
-    Ok(vec![
-        FrontendRequest::Create(Some(host), port, pos),
-        FrontendRequest::Enumerate(),
-    ])
-}
-
-fn parse_disconnect(mut l: SplitWhitespace) -> Result<Vec<FrontendRequest>> {
-    let client = l.next().context("usage: disconnect <client_id>")?.parse()?;
-    Ok(vec![
-        FrontendRequest::Delete(client),
-        FrontendRequest::Enumerate(),
-    ])
-}
-
-fn parse_activate(mut l: SplitWhitespace) -> Result<Vec<FrontendRequest>> {
-    let client = l.next().context("usage: activate <client_id>")?.parse()?;
-    Ok(vec![
-        FrontendRequest::Activate(client, true),
-        FrontendRequest::Enumerate(),
-    ])
-}
-
-fn parse_deactivate(mut l: SplitWhitespace) -> Result<Vec<FrontendRequest>> {
-    let client = l.next().context("usage: deactivate <client_id>")?.parse()?;
-    Ok(vec![
-        FrontendRequest::Activate(client, false),
-        FrontendRequest::Enumerate(),
-    ])
-}
-
-fn parse_port(mut l: SplitWhitespace) -> Result<Vec<FrontendRequest>> {
-    let port = l.next().context("usage: setport <port>")?.parse()?;
-    Ok(vec![FrontendRequest::ChangePort(port)])
+fn print_state(s: &ClientState) {
+    eprint!("active: {}, dns: {:?}", s.active, s.ips);
 }

src/frontend/cli/command.rs

@@ -0,0 +1,153 @@
+use std::{
+    fmt::Display,
+    str::{FromStr, SplitWhitespace},
+};
+
+use crate::client::{ClientHandle, Position};
+
+pub(super) enum CommandType {
+    NoCommand,
+    Help,
+    Connect,
+    Disconnect,
+    Activate,
+    Deactivate,
+    List,
+    SetHost,
+    SetPort,
+}
+
+#[derive(Debug)]
+pub(super) struct InvalidCommand {
+    cmd: String,
+}
+
+impl Display for InvalidCommand {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "invalid command: \"{}\"", self.cmd)
+    }
+}
+
+impl FromStr for CommandType {
+    type Err = InvalidCommand;
+
+    fn from_str(s: &str) -> std::prelude::v1::Result<Self, Self::Err> {
+        match s {
+            "connect" => Ok(Self::Connect),
+            "disconnect" => Ok(Self::Disconnect),
+            "activate" => Ok(Self::Activate),
+            "deactivate" => Ok(Self::Deactivate),
+            "list" => Ok(Self::List),
+            "set-host" => Ok(Self::SetHost),
+            "set-port" => Ok(Self::SetPort),
+            "help" => Ok(Self::Help),
+            _ => Err(InvalidCommand { cmd: s.to_string() }),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub(super) enum Command {
+    None,
+    Help,
+    Connect(Position, String, Option<u16>),
+    Disconnect(ClientHandle),
+    Activate(ClientHandle),
+    Deactivate(ClientHandle),
+    List,
+    SetHost(ClientHandle, String),
+    SetPort(ClientHandle, Option<u16>),
+}
+
+impl CommandType {
+    pub(super) fn usage(&self) -> &'static str {
+        match self {
+            CommandType::Help => "help",
+            CommandType::NoCommand => "",
+            CommandType::Connect => "connect left|right|top|bottom <host> [<port>]",
+            CommandType::Disconnect => "disconnect <id>",
+            CommandType::Activate => "activate <id>",
+            CommandType::Deactivate => "deactivate <id>",
+            CommandType::List => "list",
+            CommandType::SetHost => "set-host <id> <host>",
+            CommandType::SetPort => "set-port <id> <host>",
+        }
+    }
+}
+
+pub(super) enum CommandParseError {
+    Usage(CommandType),
+    Invalid(InvalidCommand),
+}
+
+impl Display for CommandParseError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::Usage(cmd) => write!(f, "usage: {}", cmd.usage()),
+            Self::Invalid(cmd) => write!(f, "{}", cmd),
+        }
+    }
+}
+
+impl FromStr for Command {
+    type Err = CommandParseError;
+
+    fn from_str(cmd: &str) -> Result<Self, Self::Err> {
+        let mut args = cmd.split_whitespace();
+        let cmd_type: CommandType = match args.next() {
+            Some(c) => c.parse().map_err(CommandParseError::Invalid),
+            None => Ok(CommandType::NoCommand),
+        }?;
+        match cmd_type {
+            CommandType::Help => Ok(Command::Help),
+            CommandType::NoCommand => Ok(Command::None),
+            CommandType::Connect => parse_connect_cmd(args),
+            CommandType::Disconnect => parse_disconnect_cmd(args),
+            CommandType::Activate => parse_activate_cmd(args),
+            CommandType::Deactivate => parse_deactivate_cmd(args),
+            CommandType::List => Ok(Command::List),
+            CommandType::SetHost => parse_set_host(args),
+            CommandType::SetPort => parse_set_port(args),
+        }
+    }
+}
+
+fn parse_connect_cmd(mut args: SplitWhitespace<'_>) -> Result<Command, CommandParseError> {
+    const USAGE: CommandParseError = CommandParseError::Usage(CommandType::Connect);
+    let pos = args.next().ok_or(USAGE)?.parse().map_err(|_| USAGE)?;
+    let host = args.next().ok_or(USAGE)?.to_string();
+    let port = args.next().and_then(|p| p.parse().ok());
+    Ok(Command::Connect(pos, host, port))
+}
+
+fn parse_disconnect_cmd(mut args: SplitWhitespace<'_>) -> Result<Command, CommandParseError> {
+    const USAGE: CommandParseError = CommandParseError::Usage(CommandType::Disconnect);
+    let id = args.next().ok_or(USAGE)?.parse().map_err(|_| USAGE)?;
+    Ok(Command::Disconnect(id))
+}
+
+fn parse_activate_cmd(mut args: SplitWhitespace<'_>) -> Result<Command, CommandParseError> {
+    const USAGE: CommandParseError = CommandParseError::Usage(CommandType::Activate);
+    let id = args.next().ok_or(USAGE)?.parse().map_err(|_| USAGE)?;
+    Ok(Command::Activate(id))
+}
+
+fn parse_deactivate_cmd(mut args: SplitWhitespace<'_>) -> Result<Command, CommandParseError> {
+    const USAGE: CommandParseError = CommandParseError::Usage(CommandType::Deactivate);
+    let id = args.next().ok_or(USAGE)?.parse().map_err(|_| USAGE)?;
+    Ok(Command::Deactivate(id))
+}
+
+fn parse_set_host(mut args: SplitWhitespace<'_>) -> Result<Command, CommandParseError> {
+    const USAGE: CommandParseError = CommandParseError::Usage(CommandType::SetHost);
+    let id = args.next().ok_or(USAGE)?.parse().map_err(|_| USAGE)?;
+    let host = args.next().ok_or(USAGE)?.parse().map_err(|_| USAGE)?;
+    Ok(Command::SetHost(id, host))
+}
+
+fn parse_set_port(mut args: SplitWhitespace<'_>) -> Result<Command, CommandParseError> {
+    const USAGE: CommandParseError = CommandParseError::Usage(CommandType::SetPort);
+    let id = args.next().ok_or(USAGE)?.parse().map_err(|_| USAGE)?;
+    let port = args.next().and_then(|p| p.parse().ok());
+    Ok(Command::SetPort(id, port))
+}

src/frontend/gtk.rs

@@ -8,7 +8,7 @@ use std::{
     process, str,
 };
 
-use crate::frontend::gtk::window::Window;
+use crate::frontend::{gtk::window::Window, FrontendRequest};
 
 use adw::Application;
 use gtk::{
@@ -113,34 +113,35 @@ fn build_ui(app: &Application) {
         }
     });
 
-    let window = Window::new(app);
-    window.imp().stream.borrow_mut().replace(tx);
+    let window = Window::new(app, tx);
+    window.request(FrontendRequest::Enumerate());
+
     glib::spawn_future_local(clone!(@weak window => async move {
         loop {
             let notify = receiver.recv().await.unwrap_or_else(|_| process::exit(1));
             match notify {
-                FrontendEvent::Activated(handle, active) => {
-                    window.activate_client(handle, active);
-                }
-                FrontendEvent::Created(handle, client) => {
-                    window.new_client(handle, client, false);
-                },
-                FrontendEvent::Updated(handle, client) => {
-                    window.update_client(handle, client);
-                }
-                FrontendEvent::Error(e) => {
-                    window.show_toast(e.as_str());
+                FrontendEvent::Created(handle, client, state) => {
+                    window.new_client(handle, client, state);
                 },
                 FrontendEvent::Deleted(client) => {
                     window.delete_client(client);
                 }
+                FrontendEvent::Updated(handle, client) => {
+                    window.update_client_config(handle, client);
+                }
+                FrontendEvent::StateChange(handle, state) => {
+                    window.update_client_state(handle, state);
+                }
+                FrontendEvent::Error(e) => {
+                    window.show_toast(e.as_str());
+                },
                 FrontendEvent::Enumerate(clients) => {
-                    for (handle, client, active) in clients {
+                    for (handle, client, state) in clients {
                         if window.client_idx(handle).is_some() {
-                            window.activate_client(handle, active);
-                            window.update_client(handle, client);
+                            window.update_client_config(handle, client);
+                            window.update_client_state(handle, state);
                         } else {
-                            window.new_client(handle, client, active);
+                            window.new_client(handle, client, state);
                         }
                     }
                 },

src/frontend/gtk/client_object.rs

@@ -3,20 +3,20 @@ mod imp;
 use adw::subclass::prelude::*;
 use gtk::glib::{self, Object};
 
-use crate::client::{Client, ClientHandle};
+use crate::client::{ClientConfig, ClientHandle, ClientState};
 
 glib::wrapper! {
     pub struct ClientObject(ObjectSubclass<imp::ClientObject>);
 }
 
 impl ClientObject {
-    pub fn new(handle: ClientHandle, client: Client, active: bool) -> Self {
+    pub fn new(handle: ClientHandle, client: ClientConfig, state: ClientState) -> Self {
         Object::builder()
             .property("handle", handle)
             .property("hostname", client.hostname)
             .property("port", client.port as u32)
             .property("position", client.pos.to_string())
-            .property("active", active)
+            .property("active", state.active)
             .build()
     }
 

src/frontend/gtk/window.rs

@@ -2,6 +2,12 @@ mod imp;
 
 use std::io::Write;
 
+#[cfg(unix)]
+use std::os::unix::net::UnixStream;
+
+#[cfg(windows)]
+use std::net::TcpStream;
+
 use adw::prelude::*;
 use adw::subclass::prelude::*;
 use glib::{clone, Object};
@@ -12,7 +18,7 @@ use gtk::{
 };
 
 use crate::{
-    client::{Client, ClientHandle, Position},
+    client::{ClientConfig, ClientHandle, ClientState, Position},
     config::DEFAULT_PORT,
     frontend::{gtk::client_object::ClientObject, FrontendRequest},
 };
@@ -27,8 +33,14 @@ glib::wrapper! {
 }
 
 impl Window {
-    pub(crate) fn new(app: &adw::Application) -> Self {
-        Object::builder().property("application", app).build()
+    pub(crate) fn new(
+        app: &adw::Application,
+        #[cfg(unix)] tx: UnixStream,
+        #[cfg(windows)] tx: TcpStream,
+    ) -> Self {
+        let window: Self = Object::builder().property("application", app).build();
+        window.imp().stream.borrow_mut().replace(tx);
+        window
     }
 
     pub fn clients(&self) -> gio::ListStore {
@@ -87,8 +99,8 @@ impl Window {
         row
     }
 
-    pub fn new_client(&self, handle: ClientHandle, client: Client, active: bool) {
-        let client = ClientObject::new(handle, client, active);
+    pub fn new_client(&self, handle: ClientHandle, client: ClientConfig, state: ClientState) {
+        let client = ClientObject::new(handle, client, state);
         self.clients().append(&client);
         self.set_placeholder_visible(false);
     }
@@ -115,7 +127,7 @@ impl Window {
         }
     }
 
-    pub fn update_client(&self, handle: ClientHandle, client: Client) {
+    pub fn update_client_config(&self, handle: ClientHandle, client: ClientConfig) {
         let Some(idx) = self.client_idx(handle) else {
             log::warn!("could not find client with handle {}", handle);
             return;
@@ -137,22 +149,23 @@ impl Window {
         }
     }
 
-    pub fn activate_client(&self, handle: ClientHandle, active: bool) {
+    pub fn update_client_state(&self, handle: ClientHandle, state: ClientState) {
         let Some(idx) = self.client_idx(handle) else {
-            log::warn!("could not find client with handle {handle}");
+            log::warn!("could not find client with handle {}", handle);
             return;
         };
         let client_object = self.clients().item(idx as u32).unwrap();
         let client_object: &ClientObject = client_object.downcast_ref().unwrap();
         let data = client_object.get_data();
-        if data.active != active {
-            client_object.set_active(active);
-            log::debug!("set active to {active}");
+
+        if state.active != data.active {
+            client_object.set_active(state.active);
+            log::debug!("set active to {}", state.active);
         }
     }
 
     pub fn request_client_create(&self) {
-        let event = FrontendRequest::Create(None, DEFAULT_PORT, Position::default());
+        let event = FrontendRequest::Create;
         self.imp().set_port(DEFAULT_PORT);
         self.request(event);
     }
@@ -167,24 +180,21 @@ impl Window {
     }
 
     pub fn request_client_update(&self, client: &ClientObject, active: bool) {
+        let handle = client.handle();
         let data = client.get_data();
-        let position = match Position::try_from(data.position.as_str()) {
-            Ok(pos) => pos,
-            _ => {
-                log::error!("invalid position: {}", data.position);
-                return;
-            }
-        };
+        let position = Position::try_from(data.position.as_str()).expect("invalid position");
         let hostname = data.hostname;
         let port = data.port as u16;
 
-        let event = FrontendRequest::Update(client.handle(), hostname, port, position);
-        log::debug!("requesting update: {event:?}");
-        self.request(event);
-
-        let event = FrontendRequest::Activate(client.handle(), active);
-        log::debug!("requesting activate: {event:?}");
-        self.request(event);
+        for event in [
+            FrontendRequest::UpdateHostname(handle, hostname),
+            FrontendRequest::UpdatePosition(handle, position),
+            FrontendRequest::UpdatePort(handle, port),
+            FrontendRequest::Activate(handle, active),
+        ] {
+            log::debug!("requesting: {event:?}");
+            self.request(event);
+        }
     }
 
     pub fn request_client_delete(&self, idx: u32) {
@@ -198,7 +208,7 @@ impl Window {
         }
     }
 
-    fn request(&self, event: FrontendRequest) {
+    pub fn request(&self, event: FrontendRequest) {
         let json = serde_json::to_string(&event).unwrap();
         log::debug!("requesting {json}");
         let mut stream = self.imp().stream.borrow_mut();

src/server.rs

@@ -1,12 +1,13 @@
 use log;
 use std::{
     cell::{Cell, RefCell},
+    collections::HashSet,
     rc::Rc,
 };
 use tokio::signal;
 
 use crate::{
-    client::{ClientHandle, ClientManager},
+    client::{ClientConfig, ClientHandle, ClientManager, ClientState},
     config::Config,
     dns,
     frontend::{FrontendListener, FrontendRequest},
@@ -49,13 +50,21 @@ impl Server {
         let state = Rc::new(Cell::new(State::Receiving));
         let port = Rc::new(Cell::new(config.port));
         for config_client in config.get_clients() {
-            client_manager.borrow_mut().add_client(
-                config_client.hostname,
-                config_client.ips,
-                config_client.port,
-                config_client.pos,
-                config_client.active,
-            );
+            let client = ClientConfig {
+                hostname: config_client.hostname,
+                fix_ips: config_client.ips.into_iter().collect(),
+                port: config_client.port,
+                pos: config_client.pos,
+            };
+            let state = ClientState {
+                active: config_client.active,
+                ips: HashSet::from_iter(client.fix_ips.iter().cloned()),
+                ..Default::default()
+            };
+            let mut client_manager = client_manager.borrow_mut();
+            let handle = client_manager.add_client();
+            let c = client_manager.get_mut(handle).expect("invalid handle");
+            *c = (client, state);
         }
         let release_bind = config.release_bind.clone();
         Self {
@@ -130,9 +139,9 @@ impl Server {
             .client_manager
             .borrow()
             .get_client_states()
-            .filter_map(|(h, s)| {
+            .filter_map(|(h, (c, s))| {
                 if s.active {
-                    Some((h, s.client.hostname.clone()))
+                    Some((h, c.hostname.clone()))
                 } else {
                     None
                 }

src/server/capture_task.rs

@@ -108,7 +108,7 @@ async fn handle_capture_event(
         // get client state for handle
         let mut client_manager = server.client_manager.borrow_mut();
         let client_state = match client_manager.get_mut(handle) {
-            Some(state) => state,
+            Some((_, s)) => s,
             None => {
                 // should not happen
                 log::warn!("unknown client!");

src/server/emulation_task.rs

@@ -108,7 +108,7 @@ async fn handle_udp_rx(
     {
         let mut client_manager = server.client_manager.borrow_mut();
         let client_state = match client_manager.get_mut(handle) {
-            Some(s) => s,
+            Some((_, s)) => s,
             None => {
                 log::error!("unknown handle");
                 return;
@@ -156,13 +156,12 @@ async fn handle_udp_rx(
                     }) = event
                     {
                         let mut client_manager = server.client_manager.borrow_mut();
-                        let client_state =
-                            if let Some(client_state) = client_manager.get_mut(handle) {
-                                client_state
-                            } else {
-                                log::error!("unknown handle");
-                                return;
-                            };
+                        let client_state = if let Some((_, s)) = client_manager.get_mut(handle) {
+                            s
+                        } else {
+                            log::error!("unknown handle");
+                            return;
+                        };
                         if state == 0 {
                             // ignore release event if key not pressed
                             ignore_event = !client_state.pressed_keys.remove(&key);
@@ -213,7 +212,7 @@ async fn release_keys(
         .borrow_mut()
         .get_mut(client)
         .iter_mut()
-        .flat_map(|s| s.pressed_keys.drain())
+        .flat_map(|(_, s)| s.pressed_keys.drain())
         .collect::<Vec<_>>();
 
     for key in keys {

src/server/frontend_task.rs

@@ -75,12 +75,11 @@ async fn handle_frontend_stream(
 
     let tx = frontend_tx.clone();
     tokio::task::spawn_local(async move {
-        let _ = tx.send(FrontendRequest::Enumerate()).await;
         loop {
-            let event = frontend::wait_for_request(&mut stream).await;
-            match event {
-                Ok(event) => {
-                    let _ = tx.send(event).await;
+            let request = frontend::wait_for_request(&mut stream).await;
+            match request {
+                Ok(request) => {
+                    let _ = tx.send(request).await;
                 }
                 Err(e) => {
                     if let Some(e) = e.downcast_ref::<io::Error>() {
@@ -98,8 +97,8 @@ async fn handle_frontend_stream(
 
 async fn handle_frontend_event(
     server: &Server,
-    capture_tx: &Sender<CaptureEvent>,
-    emulate_tx: &Sender<EmulationEvent>,
+    capture: &Sender<CaptureEvent>,
+    emulate: &Sender<EmulationEvent>,
     resolve_tx: &Sender<DnsRequest>,
     frontend: &mut FrontendListener,
     port_tx: &Sender<u16>,
@@ -107,99 +106,67 @@ async fn handle_frontend_event(
 ) -> bool {
     log::debug!("frontend: {event:?}");
     match event {
-        FrontendRequest::Create(hostname, port, pos) => {
-            add_client(
-                server,
-                frontend,
-                resolve_tx,
-                hostname,
-                HashSet::new(),
-                port,
-                pos,
-            )
-            .await;
+        FrontendRequest::Create => {
+            add_client(server, frontend).await;
         }
         FrontendRequest::Activate(handle, active) => {
             if active {
-                activate_client(server, frontend, capture_tx, emulate_tx, handle).await;
+                activate_client(server, frontend, capture, emulate, handle).await;
             } else {
-                deactivate_client(server, frontend, capture_tx, emulate_tx, handle).await;
+                deactivate_client(server, frontend, capture, emulate, handle).await;
             }
         }
         FrontendRequest::ChangePort(port) => {
             let _ = port_tx.send(port).await;
         }
         FrontendRequest::Delete(handle) => {
-            remove_client(server, frontend, capture_tx, emulate_tx, handle).await;
+            remove_client(server, frontend, capture, emulate, handle).await;
         }
         FrontendRequest::Enumerate() => {
             let clients = server
                 .client_manager
                 .borrow()
                 .get_client_states()
-                .map(|(h, s)| (h, s.client.clone(), s.active))
+                .map(|(h, (c, s))| (h, c.clone(), s.clone()))
                 .collect();
-            notify_all(frontend, FrontendEvent::Enumerate(clients)).await;
+            broadcast(frontend, FrontendEvent::Enumerate(clients)).await;
         }
         FrontendRequest::Terminate() => {
             log::info!("terminating gracefully...");
             return true;
         }
-        FrontendRequest::Update(handle, hostname, port, pos) => {
-            update_client(
-                server,
-                frontend,
-                capture_tx,
-                emulate_tx,
-                resolve_tx,
-                (handle, hostname, port, pos),
-            )
-            .await;
+        FrontendRequest::UpdateFixIps(handle, fix_ips) => {
+            update_fix_ips(server, resolve_tx, handle, fix_ips).await;
+            broadcast_client_update(server, frontend, handle).await;
+        }
+        FrontendRequest::UpdateHostname(handle, hostname) => {
+            update_hostname(server, resolve_tx, handle, hostname).await;
+            broadcast_client_update(server, frontend, handle).await;
+        }
+        FrontendRequest::UpdatePort(handle, port) => {
+            update_port(server, handle, port).await;
+            broadcast_client_update(server, frontend, handle).await;
+        }
+        FrontendRequest::UpdatePosition(handle, pos) => {
+            update_pos(server, handle, capture, emulate, pos).await;
+            broadcast_client_update(server, frontend, handle).await;
         }
     };
     false
 }
 
-async fn notify_all(frontend: &mut FrontendListener, event: FrontendEvent) {
+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,
-    resolver_tx: &Sender<DnsRequest>,
-    hostname: Option<String>,
-    addr: HashSet<IpAddr>,
-    port: u16,
-    pos: Position,
-) {
-    log::info!(
-        "adding client [{}]{} @ {:?}",
-        pos,
-        hostname.as_deref().unwrap_or(""),
-        &addr
-    );
-    let handle =
-        server
-            .client_manager
-            .borrow_mut()
-            .add_client(hostname.clone(), addr, port, pos, false);
+pub async fn add_client(server: &Server, frontend: &mut FrontendListener) {
+    let handle = server.client_manager.borrow_mut().add_client();
+    log::info!("added client {handle}");
 
-    log::debug!("add_client {handle}");
-
-    if let Some(hostname) = hostname {
-        let _ = resolver_tx.send(DnsRequest { hostname, handle }).await;
-    }
-    let client = server
-        .client_manager
-        .borrow()
-        .get(handle)
-        .unwrap()
-        .client
-        .clone();
-    notify_all(frontend, FrontendEvent::Created(handle, client)).await;
+    let (c, s) = server.client_manager.borrow().get(handle).unwrap().clone();
+    broadcast(frontend, FrontendEvent::Created(handle, c, s)).await;
 }
 
 pub async fn deactivate_client(
@@ -209,19 +176,19 @@ pub async fn deactivate_client(
     emulate: &Sender<EmulationEvent>,
     handle: ClientHandle,
 ) {
-    let (client, _) = match server.client_manager.borrow_mut().get_mut(handle) {
-        Some(state) => {
-            state.active = false;
-            (handle, state.client.pos)
+    let state = match server.client_manager.borrow_mut().get_mut(handle) {
+        Some((_, s)) => {
+            s.active = false;
+            s.clone()
         }
         None => return,
     };
 
-    let event = ClientEvent::Destroy(client);
+    let event = ClientEvent::Destroy(handle);
     let _ = capture.send(CaptureEvent::ClientEvent(event)).await;
     let _ = emulate.send(EmulationEvent::ClientEvent(event)).await;
-    let event = FrontendEvent::Activated(client, false);
-    notify_all(frontend, event).await;
+    let event = FrontendEvent::StateChange(handle, state);
+    broadcast(frontend, event).await;
 }
 
 pub async fn activate_client(
@@ -233,7 +200,7 @@ pub async fn activate_client(
 ) {
     /* deactivate potential other client at this position */
     let pos = match server.client_manager.borrow().get(handle) {
-        Some(state) => state.client.pos,
+        Some((client, _)) => client.pos,
         None => return,
     };
 
@@ -245,19 +212,19 @@ pub async fn activate_client(
     }
 
     /* activate the client */
-    server
-        .client_manager
-        .borrow_mut()
-        .get_mut(handle)
-        .unwrap()
-        .active = true;
+    let state = if let Some((_, s)) = server.client_manager.borrow_mut().get_mut(handle) {
+        s.active = true;
+        s.clone()
+    } else {
+        return;
+    };
 
     /* 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 event = FrontendEvent::Activated(handle, true);
-    notify_all(frontend, event).await;
+    let event = FrontendEvent::StateChange(handle, state);
+    broadcast(frontend, event).await;
 }
 
 pub async fn remove_client(
@@ -271,7 +238,7 @@ pub async fn remove_client(
         .client_manager
         .borrow_mut()
         .remove_client(handle)
-        .map(|s| s.active)
+        .map(|(_, s)| s.active)
     else {
         return;
     };
@@ -283,76 +250,107 @@ pub async fn remove_client(
     }
 
     let event = FrontendEvent::Deleted(handle);
-    notify_all(frontend, event).await;
+    broadcast(frontend, event).await;
 }
 
-async fn update_client(
+async fn update_fix_ips(
     server: &Server,
-    frontend: &mut FrontendListener,
-    capture: &Sender<CaptureEvent>,
-    emulate: &Sender<EmulationEvent>,
     resolve_tx: &Sender<DnsRequest>,
-    client_update: (ClientHandle, Option<String>, u16, Position),
+    handle: ClientHandle,
+    fix_ips: Vec<IpAddr>,
 ) {
-    let (handle, hostname, port, pos) = client_update;
-    let mut changed = false;
-    let (hostname, active) = {
-        // retrieve state
+    let hostname = {
         let mut client_manager = server.client_manager.borrow_mut();
-        let Some(state) = client_manager.get_mut(handle) else {
+        let Some((c, _)) = client_manager.get_mut(handle) else {
             return;
         };
 
-        // update pos
-        if state.client.pos != pos {
-            state.client.pos = pos;
-            changed = true;
-        }
-
-        // update port
-        if state.client.port != port {
-            state.client.port = port;
-            state.active_addr = state.active_addr.map(|a| SocketAddr::new(a.ip(), port));
-            changed = true;
-        }
-
-        // update hostname
-        if state.client.hostname != hostname {
-            state.client.ips = HashSet::new();
-            state.active_addr = None;
-            state.client.hostname = hostname;
-            changed = true;
-        }
-
-        log::debug!("client updated: {:?}", state);
-        (state.client.hostname.clone(), state.active)
+        c.fix_ips = fix_ips;
+        c.hostname.clone()
     };
 
-    // resolve dns if something changed
-    if changed {
-        // resolve dns
-        if let Some(hostname) = hostname {
-            let _ = resolve_tx.send(DnsRequest { hostname, handle }).await;
-        }
+    if let Some(hostname) = hostname {
+        let _ = resolve_tx.send(DnsRequest { hostname, handle }).await;
     }
+}
+
+async fn update_hostname(
+    server: &Server,
+    resolve_tx: &Sender<DnsRequest>,
+    handle: ClientHandle,
+    hostname: Option<String>,
+) {
+    let hostname = {
+        let mut client_manager = server.client_manager.borrow_mut();
+        let Some((c, s)) = client_manager.get_mut(handle) else {
+            return;
+        };
+
+        // update hostname
+        if c.hostname != hostname {
+            c.hostname = hostname;
+            s.ips = HashSet::from_iter(c.fix_ips.iter().cloned());
+            s.active_addr = None;
+            c.hostname.clone()
+        } else {
+            None
+        }
+    };
+
+    // resolve to update ips in state
+    if let Some(hostname) = hostname {
+        let _ = resolve_tx.send(DnsRequest { hostname, handle }).await;
+    }
+}
+
+async fn update_port(server: &Server, handle: ClientHandle, port: u16) {
+    let mut client_manager = server.client_manager.borrow_mut();
+    let Some((c, s)) = client_manager.get_mut(handle) else {
+        return;
+    };
+
+    if c.port != port {
+        c.port = port;
+        s.active_addr = s.active_addr.map(|a| SocketAddr::new(a.ip(), port));
+    }
+}
+
+async fn update_pos(
+    server: &Server,
+    handle: ClientHandle,
+    capture: &Sender<CaptureEvent>,
+    emulate: &Sender<EmulationEvent>,
+    pos: Position,
+) {
+    let (changed, active) = {
+        let mut client_manager = server.client_manager.borrow_mut();
+        let Some((c, s)) = client_manager.get_mut(handle) else {
+            return;
+        };
+
+        let changed = c.pos != pos;
+        c.pos = pos;
+        (changed, s.active)
+    };
 
     // update state in event input emulator & input capture
-    if changed && active {
-        // update state
-        let destroy = ClientEvent::Destroy(handle);
+    if changed {
+        if active {
+            let destroy = ClientEvent::Destroy(handle);
+            let _ = capture.send(CaptureEvent::ClientEvent(destroy)).await;
+            let _ = emulate.send(EmulationEvent::ClientEvent(destroy)).await;
+        }
         let create = ClientEvent::Create(handle, pos);
-        let _ = capture.send(CaptureEvent::ClientEvent(destroy)).await;
-        let _ = emulate.send(EmulationEvent::ClientEvent(destroy)).await;
         let _ = capture.send(CaptureEvent::ClientEvent(create)).await;
         let _ = emulate.send(EmulationEvent::ClientEvent(create)).await;
     }
-
-    let client = server
-        .client_manager
-        .borrow()
-        .get(handle)
-        .unwrap()
-        .client
-        .clone();
-    notify_all(frontend, FrontendEvent::Updated(handle, client)).await;
+}
+
+async fn broadcast_client_update(
+    server: &Server,
+    frontend: &mut FrontendListener,
+    handle: ClientHandle,
+) {
+    let (client, _) = server.client_manager.borrow().get(handle).unwrap().clone();
+    broadcast(frontend, FrontendEvent::Updated(handle, client)).await;
 }

src/server/ping_task.rs

@@ -34,7 +34,7 @@ pub fn new(
                         // if receiving we care about clients with pressed keys
                         client_manager
                             .get_client_states_mut()
-                            .filter(|(_, s)| !s.pressed_keys.is_empty())
+                            .filter(|(_, (_, s))| !s.pressed_keys.is_empty())
                             .map(|(h, _)| h)
                             .collect()
                     } else {
@@ -46,17 +46,15 @@ pub fn new(
                     let ping_addrs: Vec<SocketAddr> = {
                         ping_clients
                             .iter()
-                            .flat_map(|&c| client_manager.get(c))
-                            .flat_map(|state| {
-                                if state.alive && state.active_addr.is_some() {
-                                    vec![state.active_addr.unwrap()]
+                            .flat_map(|&h| client_manager.get(h))
+                            .flat_map(|(c, s)| {
+                                if s.alive && s.active_addr.is_some() {
+                                    vec![s.active_addr.unwrap()]
                                 } else {
-                                    state
-                                        .client
-                                        .ips
+                                    s.ips
                                         .iter()
                                         .cloned()
-                                        .map(|ip| SocketAddr::new(ip, state.client.port))
+                                        .map(|ip| SocketAddr::new(ip, c.port))
                                         .collect()
                                 }
                             })
@@ -64,8 +62,8 @@ pub fn new(
                     };
 
                     // reset alive
-                    for (_, state) in client_manager.get_client_states_mut() {
-                        state.alive = false;
+                    for (_, (_, s)) in client_manager.get_client_states_mut() {
+                        s.alive = false;
                     }
 
                     (ping_clients, ping_addrs)
@@ -102,8 +100,8 @@ pub fn new(
                     let client_manager = server.client_manager.borrow();
                     ping_clients
                         .iter()
-                        .filter_map(|&c| match client_manager.get(c) {
-                            Some(state) if !state.alive => Some(c),
+                        .filter_map(|&h| match client_manager.get(h) {
+                            Some((_, s)) if !s.alive => Some(h),
                             _ => None,
                         })
                         .collect()
@@ -112,9 +110,9 @@ pub fn new(
                 // we may not be receiving anymore but we should respond
                 // to the original state and not the "new" one
                 if receiving {
-                    for c in unresponsive_clients {
+                    for h in unresponsive_clients {
                         log::warn!("device not responding, releasing keys!");
-                        let _ = emulate_notify.send(EmulationEvent::ReleaseKeys(c)).await;
+                        let _ = emulate_notify.send(EmulationEvent::ReleaseKeys(h)).await;
                     }
                 } else {
                     // release pointer if the active client has not responded

src/server/resolver_task.rs

@@ -27,12 +27,12 @@ pub fn new(resolver: DnsResolver, server: Server) -> (JoinHandle<()>, Sender<Dns
                     continue;
                 }
             };
-            if let Some(state) = server.client_manager.borrow_mut().get_mut(handle) {
-                let mut addrs = HashSet::from_iter(state.client.fix_ips.iter().cloned());
+            if let Some((c, s)) = server.client_manager.borrow_mut().get_mut(handle) {
+                let mut addrs = HashSet::from_iter(c.fix_ips.iter().cloned());
                 for ip in ips {
                     addrs.insert(ip);
                 }
-                state.client.ips = addrs;
+                s.ips = addrs;
             }
         }
     });