Admin sees connected and disconnected clients.

src/main.py

@@ -37,6 +37,9 @@ async def connect(ws: WebSocket, player_name: str) -> None:
     app.state.players.add(player)
 
     logger.info("Player connects: %s", player_name)
+    await app.state.admin.send_text(
+        f"{len(app.state.players)}. player {player_name} connected"
+    )
 
     try:
         while True:
@@ -55,6 +58,7 @@ async def connect(ws: WebSocket, player_name: str) -> None:
     except WebSocketDisconnect:
         logger.info("Player disconnects: %s", player_name)
         app.state.players.remove(player)
+        await app.state.admin.send_text(f"Player {player_name} disconnected")
 
 
 @app.websocket("/admin")
@@ -64,6 +68,8 @@ async def admin(ws: WebSocket) -> None:
     quiz_data = await ws.receive_json()
     app.state.quiz = Quiz(**quiz_data)
 
+    app.state.admin = ws
+
     logger.info(
         "Quiz server started running quiz: %s",
         app.state.quiz.name,

src/models.py

@@ -70,6 +70,10 @@ def unblock_players(self) -> None:
         for player in self._players:
             player.allow_answer()
 
+    def __len__(self) -> int:
+        """Return the number of currently connected players."""
+        return len(self._players)
+
     async def send(self, data: dict) -> None:
         """Broadcast a message to all connected players."""
         for player in self._players: