feat : 서버 실패 코드 메시지 기능 추가

MMOTestServer/MMOserver/Game/GameServer.cs

@@ -484,6 +484,7 @@ public class GameServer : ServerBase
             {
                 if (!pm.CreateParty(hashKey, req.PartyName, out PartyInfo? party))
                 {
+                    SendError(peer, ErrorCode.PARTY_ALREADY_IN_PARTY);
                     return;
                 }
 
@@ -503,6 +504,7 @@ public class GameServer : ServerBase
             {
                 if (!pm.JoinParty(hashKey, req.PartyId, out PartyInfo? party))
                 {
+                    SendError(peer, ErrorCode.PARTY_JOIN_FAILED);
                     return;
                 }
 
@@ -521,6 +523,7 @@ public class GameServer : ServerBase
             {
                 if (!pm.LeaveParty(hashKey, out PartyInfo? party))
                 {
+                    SendError(peer, ErrorCode.PARTY_NOT_IN_PARTY);
                     return;
                 }
 
@@ -544,6 +547,7 @@ public class GameServer : ServerBase
             {
                 if (!pm.DeleteParty(hashKey, req.PartyId, out PartyInfo? party))
                 {
+                    SendError(peer, ErrorCode.PARTY_DELETE_FAILED);
                     return;
                 }
 
@@ -560,6 +564,13 @@ public class GameServer : ServerBase
         }
     }
 
+    private void SendError(NetPeer peer, ErrorCode code)
+    {
+        ErrorPacket err = new ErrorPacket { Code = code };
+        byte[] data = PacketSerializer.Serialize<ErrorPacket>((ushort)PacketCode.ERROR, err);
+        SendTo(peer, data);
+    }
+
     private void BroadcastToUsers(IEnumerable<int> userIds, byte[] data, DeliveryMethod method = DeliveryMethod.ReliableOrdered)
     {
         foreach (int userId in userIds)