403 lines
13 KiB
Rust
403 lines
13 KiB
Rust
use std::error::Error;
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use std::os::fd::{FromRawFd, RawFd};
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use std::os::unix::net::UnixStream;
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use std::sync::mpsc;
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use std::sync::mpsc::{Receiver, Sender, TryRecvError};
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use std::thread;
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use ferese_protocols::shell::v1::client::ferese_shell_manager_v1::FereseShellManagerV1;
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use ferese_protocols::shell::v1::client::ferese_shell_v1;
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use ferese_protocols::shell::v1::client::ferese_shell_v1::FereseShellV1;
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use wayland_client::globals::{GlobalListContents, registry_queue_init};
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use wayland_client::protocol::wl_registry;
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use wayland_client::{Connection, Dispatch, Proxy, QueueHandle, WEnum, delegate_noop};
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#[derive(Clone, Debug, Default)]
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pub(crate) struct ShellSnapshot {
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pub(crate) outputs: Vec<OutputSnapshot>,
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pub(crate) workspaces: Vec<WorkspaceSnapshot>,
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pub(crate) windows: Vec<WindowSnapshot>,
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}
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impl ShellSnapshot {
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pub(crate) fn workspaces_for_output(&self, output: Option<u64>) -> impl Iterator<Item = &WorkspaceSnapshot> {
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self.workspaces
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.iter()
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.filter(move |workspace| output.is_some() && workspace.output == output)
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}
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}
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#[derive(Clone, Debug)]
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pub(crate) struct OutputSnapshot {
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pub(crate) id: u64,
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pub(crate) name: String,
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pub(crate) active_workspace: u64,
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pub(crate) focused: bool,
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}
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#[derive(Clone, Debug)]
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pub(crate) struct WorkspaceSnapshot {
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pub(crate) id: u64,
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pub(crate) name: String,
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pub(crate) output: Option<u64>,
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pub(crate) index: u32,
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pub(crate) window_count: u32,
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pub(crate) visible: bool,
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pub(crate) focused: bool,
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}
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#[derive(Clone, Debug)]
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pub(crate) struct WindowSnapshot {
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pub(crate) workspace: u64,
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pub(crate) app_id: String,
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pub(crate) title: String,
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pub(crate) focused: bool,
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pub(crate) fullscreen: bool,
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}
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pub(crate) struct ShellControl {
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connection: Connection,
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_manager: FereseShellManagerV1,
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shell: FereseShellV1,
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updates: Receiver<ControlUpdate>,
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}
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pub(crate) struct ControlPoll {
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pub(crate) config: Option<String>,
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pub(crate) snapshot: Option<ShellSnapshot>,
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pub(crate) overview_active: Option<bool>,
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pub(crate) disconnected: bool,
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pub(crate) logout: Option<(u32, String)>,
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pub(crate) logout_cancelled: Vec<u32>,
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pub(crate) guide_toggles: Vec<String>,
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}
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enum ControlUpdate {
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Config(String),
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Snapshot(ShellSnapshot),
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OverviewState(bool),
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Disconnected,
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Logout(u32, String),
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LogoutCancelled(u32),
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ToggleGuide(String),
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}
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impl ShellControl {
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pub(crate) fn connect() -> Result<Self, Box<dyn Error>> {
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let connection = control_connection()?;
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let (globals, mut queue) = registry_queue_init::<ControlState>(&connection)?;
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let qh = queue.handle();
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let manager = globals.bind::<FereseShellManagerV1, _, _>(&qh, 4..=5, ())?;
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let shell = manager.get_shell(&qh, ());
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let (sender, updates) = mpsc::channel();
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let mut state = ControlState::new(sender);
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connection.flush()?;
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thread::Builder::new()
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.name("ferese-shell-control".to_owned())
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.spawn(move || {
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while queue.blocking_dispatch(&mut state).is_ok() {}
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let _ = state.sender.send(ControlUpdate::Disconnected);
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})?;
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Ok(Self {
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connection,
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_manager: manager,
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shell,
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updates,
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})
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}
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pub(crate) fn poll(&self) -> ControlPoll {
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let mut poll = ControlPoll {
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config: None,
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snapshot: None,
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overview_active: None,
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disconnected: false,
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logout: None,
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logout_cancelled: Vec::new(),
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guide_toggles: Vec::new(),
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};
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loop {
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match self.updates.try_recv() {
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Ok(ControlUpdate::Logout(serial, output)) => poll.logout = Some((serial, output)),
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Ok(ControlUpdate::ToggleGuide(output)) => poll.guide_toggles.push(output),
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Ok(ControlUpdate::LogoutCancelled(serial)) => {
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if poll.logout.as_ref().is_some_and(|(pending, _)| *pending == serial) {
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poll.logout = None;
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}
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poll.logout_cancelled.push(serial);
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}
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Ok(ControlUpdate::Config(source)) => poll.config = Some(source),
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Ok(ControlUpdate::Snapshot(snapshot)) => poll.snapshot = Some(snapshot),
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Ok(ControlUpdate::OverviewState(active)) => poll.overview_active = Some(active),
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Ok(ControlUpdate::Disconnected) | Err(TryRecvError::Disconnected) => {
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poll.disconnected = true;
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return poll;
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}
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Err(TryRecvError::Empty) => return poll,
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}
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}
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}
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pub(crate) fn activate_workspace(&self, id: u64) {
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let (hi, lo) = split_id(id);
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self.shell.activate_workspace(hi, lo);
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let _ = self.connection.flush();
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}
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pub(crate) fn confirm_logout(&self, serial: u32, revision: u32, token: u32, force: bool) {
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self.shell
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.confirm_logout_with_inhibitors(serial, revision, token, u32::from(force));
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let _ = self.connection.flush();
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}
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pub(crate) fn cancel_logout(&self, serial: u32) {
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if self.shell.version() >= 3 {
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self.shell.cancel_logout(serial);
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let _ = self.connection.flush();
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}
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}
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pub(crate) fn set_overview_active(&self, active: bool) {
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if active {
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self.shell.enter_overview();
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} else {
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self.shell.exit_overview();
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}
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let _ = self.connection.flush();
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}
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}
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fn control_connection() -> Result<Connection, Box<dyn Error>> {
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let raw_fd =
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std::env::var_os("FERESE_SHELL_CONTROL_SOCKET").ok_or("Ferese did not provide a shell-control connection")?;
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let fd = raw_fd
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.to_str()
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.ok_or("FERESE_SHELL_CONTROL_SOCKET is not valid UTF-8")?
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.parse::<RawFd>()?;
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// SAFETY: Ferese passes ownership of this inherited descriptor to the
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// shell. This function is called once and consumes the descriptor.
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let socket = unsafe { UnixStream::from_raw_fd(fd) };
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// Rust's cloned stream is close-on-exec. Do not leak shell-control authority
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// into status helpers or applications launched from the menu.
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let connection_socket = socket.try_clone()?;
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drop(socket);
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Ok(Connection::from_socket(connection_socket)?)
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}
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struct ControlState {
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config: Option<String>,
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sender: Sender<ControlUpdate>,
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pending: ShellSnapshot,
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serial: Option<u32>,
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}
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impl ControlState {
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fn new(sender: Sender<ControlUpdate>) -> Self {
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Self {
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sender,
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config: None,
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pending: ShellSnapshot::default(),
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serial: None,
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}
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}
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}
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impl Dispatch<wl_registry::WlRegistry, GlobalListContents> for ControlState {
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fn event(
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_state: &mut Self,
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_registry: &wl_registry::WlRegistry,
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_event: wl_registry::Event,
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_data: &GlobalListContents,
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_connection: &Connection,
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_qh: &QueueHandle<Self>,
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) {
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}
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}
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impl Dispatch<FereseShellV1, ()> for ControlState {
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fn event(
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state: &mut Self,
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_shell: &FereseShellV1,
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event: ferese_shell_v1::Event,
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_data: &(),
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_connection: &Connection,
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_qh: &QueueHandle<Self>,
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) {
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match event {
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ferese_shell_v1::Event::ConfigBegin => state.config = Some(String::new()),
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ferese_shell_v1::Event::ConfigChunk { source } => {
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append_config_chunk(&mut state.config, &source);
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}
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ferese_shell_v1::Event::ConfigEnd => {
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if let Some(source) = state.config.take() {
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let _ = state.sender.send(ControlUpdate::Config(source));
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}
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}
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ferese_shell_v1::Event::SnapshotBegin { serial } => {
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state.serial = Some(serial);
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state.pending = ShellSnapshot::default();
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}
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ferese_shell_v1::Event::Output {
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output_hi,
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output_lo,
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name,
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active_workspace_hi,
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active_workspace_lo,
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focused,
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} => state.pending.outputs.push(OutputSnapshot {
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id: join_id(output_hi, output_lo),
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name,
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active_workspace: join_id(active_workspace_hi, active_workspace_lo),
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focused: focused != 0,
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}),
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ferese_shell_v1::Event::Workspace {
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workspace_hi,
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workspace_lo,
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output_hi,
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output_lo,
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name,
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index,
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window_count,
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visible,
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focused,
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} => {
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let output = join_id(output_hi, output_lo);
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state.pending.workspaces.push(WorkspaceSnapshot {
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id: join_id(workspace_hi, workspace_lo),
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name,
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output: (output != 0).then_some(output),
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index,
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window_count,
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visible: visible != 0,
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focused: focused != 0,
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});
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}
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ferese_shell_v1::Event::Window {
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window_hi: _,
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window_lo: _,
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workspace_hi,
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workspace_lo,
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app_id,
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title,
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state: window_state,
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} => {
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let (focused, fullscreen) = match window_state {
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WEnum::Value(flags) => (
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flags.contains(ferese_shell_v1::WindowState::Focused),
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flags.contains(ferese_shell_v1::WindowState::Fullscreen),
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),
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WEnum::Unknown(_) => (false, false),
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};
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state.pending.windows.push(WindowSnapshot {
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workspace: join_id(workspace_hi, workspace_lo),
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app_id,
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title,
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focused,
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fullscreen,
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});
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}
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ferese_shell_v1::Event::SnapshotEnd { serial } if state.serial.take() == Some(serial) => {
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let _ = state.sender.send(ControlUpdate::Snapshot(state.pending.clone()));
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}
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ferese_shell_v1::Event::LogoutRequested { serial, output_name } => {
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let _ = state.sender.send(ControlUpdate::Logout(serial, output_name));
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}
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ferese_shell_v1::Event::ToggleKeybindingGuide { output_name } => {
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let _ = state.sender.send(ControlUpdate::ToggleGuide(output_name));
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}
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ferese_shell_v1::Event::LogoutCancelled { serial } => {
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let _ = state.sender.send(ControlUpdate::LogoutCancelled(serial));
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}
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ferese_shell_v1::Event::OverviewState { active } => {
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let _ = state.sender.send(ControlUpdate::OverviewState(active != 0));
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}
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_ => {}
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}
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}
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}
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delegate_noop!(ControlState: ignore FereseShellManagerV1);
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fn split_id(id: u64) -> (u32, u32) {
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((id >> 32) as u32, id as u32)
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}
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fn join_id(hi: u32, lo: u32) -> u64 {
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(u64::from(hi) << 32) | u64::from(lo)
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}
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fn append_config_chunk(config: &mut Option<String>, source: &str) {
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if let Some(buffer) = config {
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if buffer.len() + source.len() > 60 * 1024 {
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*config = None;
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} else {
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buffer.push_str(source);
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn config_transfer_is_bounded_and_requires_begin() {
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let mut config = None;
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append_config_chunk(&mut config, "ignored");
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assert!(config.is_none());
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config = Some(String::new());
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append_config_chunk(&mut config, "🌲");
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append_config_chunk(&mut config, "theme");
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assert_eq!(config.take().as_deref(), Some("🌲theme"));
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config = Some("a".repeat(60 * 1024));
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append_config_chunk(&mut config, "overflow");
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assert!(config.is_none());
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append_config_chunk(&mut config, "ignored after overflow");
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assert!(config.is_none());
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}
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}
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#[cfg(test)]
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mod workspace_tests {
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use super::*;
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#[test]
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fn each_bar_uses_its_own_order_and_authoritative_occupancy() {
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let workspace = |id, output, index, window_count| WorkspaceSnapshot {
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id,
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output: Some(output),
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index,
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name: index.to_string(),
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window_count,
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visible: index == 1,
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focused: output == 1 && index == 1,
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};
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let snapshot = ShellSnapshot {
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workspaces: vec![workspace(7, 1, 1, 2), workspace(9, 1, 2, 0), workspace(3, 2, 1, 0)],
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..Default::default()
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};
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let left = snapshot.workspaces_for_output(Some(1)).collect::<Vec<_>>();
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assert_eq!(
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left.iter().map(|workspace| workspace.id).collect::<Vec<_>>(),
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vec![7, 9]
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);
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assert_eq!(left[0].window_count, 2);
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assert_eq!(
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snapshot
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.workspaces_for_output(Some(2))
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.map(|workspace| workspace.id)
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.collect::<Vec<_>>(),
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vec![3]
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);
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assert_eq!(snapshot.workspaces_for_output(None).count(), 0);
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assert_eq!(snapshot.workspaces_for_output(Some(99)).count(), 0);
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}
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}
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