Async mqtt server

Cargo.lock

@@ -3184,6 +3184,7 @@ dependencies = [
  "anyhow",
  "bitflags 2.5.0",
  "common",
+ "parking_lot",
  "serde",
  "serde_json",
 ]

remote_send/Cargo.toml

@@ -10,3 +10,4 @@ serde_json = "1.0.117"
 
 common = { path = "../common" }
 bitflags = "2.5.0"
+parking_lot = "0.12.3"

remote_send/src/main.rs

@@ -1,13 +1,10 @@
-use std::{net::UdpSocket, thread};
-
 use anyhow::Result;
+use std::net::UdpSocket;
 
-use remote_send::{mqtt, status::StatusData, Response};
+use remote_send::{mqtt::MqttServer, status::StatusData, Response};
 
 fn main() -> Result<()> {
-    thread::spawn(|| {
+    MqttServer::new().start_async()?;
-        mqtt::start().unwrap();
-    });
 
     let socket = UdpSocket::bind("0.0.0.0:3000")?;
 

remote_send/src/mqtt/misc.rs

@@ -0,0 +1,6 @@
+use std::sync::atomic::{AtomicU64, Ordering};
+
+pub fn next_id() -> u64 {
+    static NEXT_ID: AtomicU64 = AtomicU64::new(0);
+    NEXT_ID.fetch_add(1, Ordering::Relaxed)
+}

remote_send/src/mqtt/mod.rs

@@ -1,37 +1,86 @@
 use std::{
     borrow::Cow,
+    collections::HashMap,
     io::{Read, Write},
     net::{TcpListener, TcpStream},
+    sync::Arc,
     thread,
 };
 
 use anyhow::Result;
 use common::serde::Deserializer;
+use misc::next_id;
 use packets::{
     connect::ConnectPacket,
     connect_ack::{ConnectAckFlags, ConnectAckPacket, ConnectReturnCode},
     subscribe::SubscribePacket,
 };
+use parking_lot::{lock_api::MutexGuard, MappedMutexGuard, Mutex};
 
+mod misc;
 pub mod packets;
 
-pub fn start() -> Result<()> {
+pub struct MqttServer {
+    clients: Mutex<HashMap<u64, MqttClient>>,
+}
+
+#[derive(Debug)]
+pub struct MqttClient {
+    stream: TcpStream,
+    subscriptions: Vec<String>,
+}
+
+impl MqttServer {
+    pub fn new() -> Arc<Self> {
+        Arc::new(Self {
+            clients: Mutex::new(HashMap::new()),
+        })
+    }
+
+    pub fn start_async(self: Arc<Self>) -> Result<()> {
         let socket = TcpListener::bind("0.0.0.0:1883")?;
 
+        thread::spawn(move || {
             for stream in socket.incoming() {
-        let stream = stream?;
+                let stream = stream.unwrap();
+                let client_id = next_id();
+                self.clients
+                    .lock()
+                    .insert(client_id, MqttClient::new(stream.try_clone().unwrap()));
+
                 println!("Connection established: {:?}", stream);
-        thread::spawn(|| {
+
-            if let Err(e) = handle_client(stream) {
+                let this_self = self.clone();
+                thread::spawn(move || {
+                    if let Err(e) = handle_client(this_self, client_id, stream) {
                         eprintln!("Error handling client: {:?}", e);
                     }
                 });
             }
+        });
 
         Ok(())
     }
 
-fn handle_client(mut stream: TcpStream) -> Result<()> {
+    fn get_client_mut(&self, client_id: u64) -> MappedMutexGuard<MqttClient> {
+        MutexGuard::map(self.clients.lock(), |x| x.get_mut(&client_id).unwrap())
+    }
+
+    fn remove_client(&self, client_id: u64) {
+        self.clients.lock().remove(&client_id);
+    }
+}
+
+impl MqttClient {
+    fn new(stream: TcpStream) -> Self {
+        Self {
+            stream,
+            subscriptions: Vec::new(),
+        }
+    }
+}
+
+fn handle_client(server: Arc<MqttServer>, client_id: u64, mut stream: TcpStream) -> Result<()> {
     loop {
         let packet = Packet::read(&mut stream)?;
 
@@ -50,11 +99,22 @@ fn handle_client(mut stream: TcpStream) -> Result<()> {
             SubscribePacket::PACKET_TYPE => {
                 let packet = SubscribePacket::from_bytes(&packet.remaining_bytes)?;
                 println!("Subscribe packet: {:?}", packet);
+                server
+                    .get_client_mut(client_id)
+                    .subscriptions
+                    .extend(packet.filters.into_iter().map(|x| x.0));
+                dbg!(&server.get_client_mut(client_id));
+            }
+            0x0E => {
+                println!("Client disconnect: {client_id}");
+                server.remove_client(client_id);
+                break;
             }
             ty => eprintln!("Unsupported packet type: 0x{ty:x}"),
         }
     }
 
+    Ok(())
 }
 
 pub struct Packet {

ui/src/windows/slice_preview.rs

@@ -50,7 +50,7 @@ pub fn ui(app: &mut App, ctx: &Context, _frame: &mut Frame) {
                             None
                         };
 
-                        egui::Frame::canvas(&ui.style()).show(ui, |ui| {
+                        egui::Frame::canvas(ui.style()).show(ui, |ui| {
                             let available_size = ui.available_size();
                             let (rect, _response) = ui.allocate_exact_size(
                                 Vec2::new(