conn.send시 ConnectionClosed 예외처리

conn/internal/conn.py

@@ -1,4 +1,5 @@
 from fastapi.websockets import WebSocket
+from websockets.exceptions import ConnectionClosed
 from message import Message
 from dataclasses import dataclass
 
@@ -22,4 +23,8 @@ async def receive(self):
         return Message.from_str(await self.conn.receive_text())
 
     async def send(self, msg: Message):
-        await self.conn.send_text(msg.to_str())
+        try:
+            await self.conn.send_text(msg.to_str())
+        except ConnectionClosed:
+            # 커넥션이 종료되었는데도 타이밍 문제로 인해 커넥션을 가져왔을 수 있음.
+            return