2022-11-15 00:22:27 +00:00
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// Copyright (c) 2022 Marceline Cramer
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// SPDX-License-Identifier: AGPL-3.0-or-later
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2022-10-29 23:07:34 +00:00
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use std::collections::HashMap;
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2022-10-28 04:52:42 +00:00
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use std::ops::{Deref, DerefMut};
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use std::path::{Path, PathBuf};
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use std::sync::mpsc::{channel, Receiver, Sender};
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2022-10-29 22:54:51 +00:00
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use std::sync::Arc;
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2022-10-28 04:52:42 +00:00
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use std::time::Duration;
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2022-10-28 04:23:03 +00:00
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2022-10-29 05:22:36 +00:00
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use mio::net::{UnixListener, UnixStream};
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use mio::{Events, Interest, Poll, Token, Waker};
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use mio_signals::{Signal, Signals};
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use parking_lot::RwLock;
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use slab::Slab;
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2022-11-01 07:41:13 +00:00
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use crate::protocol::{CreatePanel, MagpieServerMsg, SendMessage, ServerMessenger};
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2022-11-03 05:00:59 +00:00
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use crate::service::window::{WindowMessage, WindowMessageSender};
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2022-10-28 04:23:03 +00:00
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2022-10-28 02:15:47 +00:00
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const SOCK_NAME: &str = "magpie.sock";
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2022-10-28 04:23:03 +00:00
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pub enum IpcMessage {}
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2022-10-28 04:52:42 +00:00
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pub struct IpcMessageSender {
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waker: Waker,
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sender: Sender<IpcMessage>,
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}
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2022-10-28 02:15:47 +00:00
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/// Wraps [mio::net::UnixListener] with automatic file deletion on drop.
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pub struct Listener {
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pub uds: UnixListener,
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pub path: PathBuf,
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}
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impl Drop for Listener {
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fn drop(&mut self) {
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match std::fs::remove_file(&self.path) {
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Ok(_) => {}
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Err(e) => eprintln!("Could not delete UnixListener {:?}", e),
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}
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}
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}
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impl Deref for Listener {
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type Target = UnixListener;
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fn deref(&self) -> &UnixListener {
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&self.uds
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}
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}
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impl DerefMut for Listener {
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fn deref_mut(&mut self) -> &mut UnixListener {
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&mut self.uds
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}
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}
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2022-10-29 22:54:51 +00:00
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pub struct IpcData {
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poll: Poll,
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next_window_id: usize,
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}
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impl IpcData {
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pub fn new_window_id(&mut self) -> usize {
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let id = self.next_window_id;
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self.next_window_id = self.next_window_id.wrapping_add(1);
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id
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}
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}
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pub struct Client {
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data: Arc<RwLock<IpcData>>,
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window_sender: WindowMessageSender,
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messenger: ServerMessenger<UnixStream>,
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token: Token,
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id_to_window: HashMap<u32, usize>,
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}
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impl Drop for Client {
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fn drop(&mut self) {
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println!("Client #{} disconnected", self.token.0);
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let data = self.data.write();
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let _ = data
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.poll
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.registry()
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.deregister(&mut self.messenger.transport);
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for (_id, window) in self.id_to_window.drain() {
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let msg = WindowMessage::CloseWindow { id: window };
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let _ = self.window_sender.send_event(msg);
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}
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}
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}
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impl Client {
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pub fn on_readable(&mut self) -> std::io::Result<bool> {
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self.messenger.flush_recv()?;
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while let Some(msg) = self.messenger.recv() {
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println!("Client #{}: {:?}", self.token.0, msg);
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match msg {
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2022-10-30 00:00:46 +00:00
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MagpieServerMsg::CreatePanel(CreatePanel { id, script }) => {
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let window = self.data.write().new_window_id();
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if let Some(old_id) = self.id_to_window.insert(id, window) {
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let msg = WindowMessage::CloseWindow { id: old_id };
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let _ = self.window_sender.send_event(msg);
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}
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2022-10-30 00:00:46 +00:00
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let msg = WindowMessage::OpenWindow { id: window, script };
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let _ = self.window_sender.send_event(msg);
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}
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2022-10-31 01:11:24 +00:00
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MagpieServerMsg::SendMessage(SendMessage { id, msg }) => {
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if let Some(id) = self.id_to_window.get(&id).cloned() {
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let msg = WindowMessage::SendMessage { id, msg };
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let _ = self.window_sender.send_event(msg);
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}
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}
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}
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}
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Ok(self.messenger.is_closed())
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}
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}
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pub struct Ipc {
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pub data: Arc<RwLock<IpcData>>,
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pub window_sender: WindowMessageSender,
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pub message_recv: Receiver<IpcMessage>,
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pub events: Events,
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pub quit: bool,
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pub listener: Listener,
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pub signals: Signals,
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pub listener_token: Token,
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pub signals_token: Token,
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pub message_recv_token: Token,
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pub clients: Slab<Client>,
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}
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impl Ipc {
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pub fn new(window_sender: WindowMessageSender) -> std::io::Result<(Self, IpcMessageSender)> {
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let sock_dir = std::env::var("XDG_RUNTIME_DIR").expect("XDG_RUNTIME_DIR not set");
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let sock_dir = Path::new(&sock_dir);
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let sock_path = sock_dir.join(SOCK_NAME);
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eprintln!("Making socket at: {:?}", sock_path);
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let mut listener = Listener {
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uds: UnixListener::bind(&sock_path)?,
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path: sock_path.to_path_buf(),
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};
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let mut signals = Signals::new(Signal::Interrupt | Signal::Quit)?;
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let events = Events::with_capacity(128);
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let poll = Poll::new()?;
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let listener_token = Token(usize::MAX);
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let signals_token = Token(listener_token.0 - 1);
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let message_recv_token = Token(signals_token.0 - 1);
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let registry = poll.registry();
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let interest = Interest::READABLE;
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registry.register(&mut listener.uds, listener_token, interest)?;
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registry.register(&mut signals, signals_token, interest)?;
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2022-10-28 04:52:42 +00:00
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let (sender, message_recv) = channel();
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let sender = IpcMessageSender {
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waker: Waker::new(registry, message_recv_token)?,
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sender,
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};
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2022-10-29 23:07:34 +00:00
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let data = IpcData {
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poll,
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next_window_id: 0,
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};
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let ipc = Self {
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data: Arc::new(RwLock::new(data)),
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window_sender,
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message_recv,
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events,
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quit: false,
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listener,
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signals,
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listener_token,
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signals_token,
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message_recv_token,
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clients: Default::default(),
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};
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Ok((ipc, sender))
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}
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pub fn poll(&mut self, timeout: Option<Duration>) -> std::io::Result<()> {
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self.data.write().poll.poll(&mut self.events, timeout)?;
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for event in self.events.iter() {
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if event.token() == self.listener_token {
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loop {
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match self.listener.accept() {
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Ok((mut connection, address)) => {
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let token = Token(self.clients.vacant_key());
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println!(
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"Accepting connection (Client #{}) from {:?}",
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token.0, address
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);
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2022-10-29 05:22:36 +00:00
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let interest = Interest::READABLE;
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self.data.write().poll.registry().register(
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&mut connection,
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token,
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interest,
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)?;
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self.clients.insert(Client {
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messenger: ServerMessenger::new(connection),
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token,
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data: self.data.clone(),
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window_sender: self.window_sender.clone(),
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id_to_window: Default::default(),
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});
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}
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Err(ref err) if err.kind() == std::io::ErrorKind::WouldBlock => break,
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Err(err) => return Err(err),
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}
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}
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} else if event.token() == self.signals_token {
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while let Some(received) = self.signals.receive()? {
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eprintln!("Received {:?} signal; exiting...", received);
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let _ = self.window_sender.send_event(WindowMessage::Quit);
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self.quit = true;
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}
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} else if let Some(client) = self.clients.get_mut(event.token().0) {
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let disconnected = client.on_readable()?;
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if disconnected {
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self.clients.remove(event.token().0);
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}
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} else {
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panic!("Unrecognized event token: {:?}", event);
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}
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}
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Ok(())
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}
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pub fn run(mut self) {
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while !self.quit {
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let wait = Duration::from_millis(100);
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match self.poll(Some(wait)) {
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Ok(_) => {}
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Err(e) => {
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eprintln!("IPC poll error: {:?}", e);
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}
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}
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}
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}
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}
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