update lobby datas on team master transfer

src/ReceiveCommands.cc

@@ -4845,6 +4845,7 @@ static void on_EA_BB(shared_ptr<Client> c, uint16_t command, uint32_t flag, stri
         // The client only sends this command with flag = 0x00, 0x30, or 0x40
         bool send_updates_for_this_m = false;
         bool send_updates_for_other_m = false;
+        bool send_master_transfer_updates = false;
         switch (flag) {
           case 0x00: // Demote member
             if (s->team_index->demote_leader(c->license->serial_number, cmd.guild_card_number)) {
@@ -4867,11 +4868,21 @@ static void on_EA_BB(shared_ptr<Client> c, uint16_t command, uint32_t flag, stri
             send_command(c, 0x11EA, 0x00000000);
             send_updates_for_this_m = true;
             send_updates_for_other_m = true;
+            send_master_transfer_updates = true;
             break;
           default:
             throw runtime_error("invalid privilege level");
         }
 
+        if (send_master_transfer_updates) {
+          for (const auto& it : team->members) {
+            try {
+              auto other_c = s->find_client(nullptr, it.second.serial_number);
+              send_update_lobby_data_bb(other_c);
+            } catch (const out_of_range&) {
+            }
+          }
+        }
         if (send_updates_for_this_m) {
           send_update_team_metadata_for_client(c);
           send_team_membership_info(c);

src/SendCommands.cc

@@ -2181,6 +2181,17 @@ void send_player_join_notification(shared_ptr<Client> c,
   }
 }
 
+void send_update_lobby_data_bb(std::shared_ptr<Client> c) {
+  auto l = c->require_lobby();
+  for (auto lc : l->clients) {
+    if (lc) {
+      PlayerLobbyDataBB cmd;
+      populate_lobby_data_for_client(cmd, c, lc);
+      send_command_t(lc, 0x00F0, 0x00000000, cmd);
+    }
+  }
+}
+
 void send_player_leave_notification(shared_ptr<Lobby> l, uint8_t leaving_client_id) {
   S_LeaveLobby_66_69_Ep3_E9 cmd = {leaving_client_id, l->leader_id, 1, 0};
   uint8_t cmd_num;

src/SendCommands.hh

@@ -268,6 +268,7 @@ void send_lobby_list(std::shared_ptr<Client> c);
 
 void send_player_records(std::shared_ptr<Client> c, std::shared_ptr<Lobby> l, std::shared_ptr<Client> joining_client = nullptr);
 void send_join_lobby(std::shared_ptr<Client> c, std::shared_ptr<Lobby> l);
+void send_update_lobby_data_bb(std::shared_ptr<Client> c);
 void send_player_join_notification(std::shared_ptr<Client> c, std::shared_ptr<Lobby> l, std::shared_ptr<Client> joining_client);
 void send_player_leave_notification(std::shared_ptr<Lobby> l, uint8_t leaving_client_id);
 void send_self_leave_notification(std::shared_ptr<Client> c);

src/ServerState.cc

@@ -327,6 +327,10 @@ void ServerState::on_player_left_lobby(shared_ptr<Lobby> l, uint8_t leaving_clie
 }
 
 shared_ptr<Client> ServerState::find_client(const string* identifier, uint64_t serial_number, shared_ptr<Lobby> l) {
+  // WARNING: There are multiple callsites where we assume this function never
+  // returns a client that isn't in any lobby. If this behavior changes, we will
+  // need to audit all callsites to ensure correctness.
+
   if ((serial_number == 0) && identifier) {
     try {
       serial_number = stoull(*identifier, nullptr, 0);