added new event system to handle different client events in game and on connection

server/src/events.rs

@@ -0,0 +1,77 @@
+use serde::{Deserialize, Serialize};
+use std::sync::Arc;
+use tokio::sync::Mutex;
+use tokio::sync::mpsc;
+use uuid::Uuid;
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct Step {
+    pub from: String,
+    pub to: String,
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+#[serde(tag = "type")]
+pub enum ClientEvent {
+    Join { username: String },
+    FindMatch,
+    Move { from: String, to: String },
+    Resign,
+    Chat { text: String },
+    RequestLegalMoves { fen: String },
+}
+
+#[derive(Debug)]
+pub enum ServerEvent {
+    PlayerJoined(Uuid, String),
+    PlayerLeft(Uuid),
+    PlayerJoinedQueue(Uuid),
+    PlayerJoinedMatch(Uuid, Uuid), // player_id, match_id
+    PlayerMove(Uuid, Step),
+    PlayerResigned(Uuid),
+    MatchCreated(Uuid, Uuid, Uuid), // match_id, white_id, black_id
+}
+
+pub struct EventSystem {
+    sender: mpsc::UnboundedSender<(Uuid, ClientEvent)>,
+    receiver: Arc<Mutex<mpsc::UnboundedReceiver<(Uuid, ClientEvent)>>>,
+}
+
+impl Clone for EventSystem {
+    fn clone(&self) -> Self {
+        Self {
+            sender: self.sender.clone(),
+            receiver: Arc::clone(&self.receiver),
+        }
+    }
+}
+
+impl EventSystem {
+    pub fn new() -> Self {
+        let (sender, receiver) = mpsc::unbounded_channel();
+        Self {
+            sender,
+            receiver: Arc::new(Mutex::new(receiver)),
+        }
+    }
+
+    pub async fn send_event(
+        &self,
+        player_id: Uuid,
+        event: ClientEvent,
+    ) -> Result<(), Box<dyn std::error::Error>> {
+        self.sender.send((player_id, event))?;
+        Ok(())
+    }
+
+    pub async fn next_event(&self) -> Option<(Uuid, ClientEvent)> {
+        let mut receiver = self.receiver.lock().await;
+        receiver.recv().await
+    }
+}
+
+impl Default for EventSystem {
+    fn default() -> Self {
+        Self::new()
+    }
+}