multiplayer: Adds option to pause server

OpenRCT2 does not provide a simple function to pause a server
while no client is connected. This patch adds a so called
"pause_server_if_no_clients" flag within network section of
config.ini. By default this flag is set to false to be backward
compatible with running servers. After setting this flag to
true the game is paused on launch and gets unpaused on first
connection.

Signed-off-by: Tobias Kohlbau <tobias@kohlbau.de>

src/openrct2/config/Config.cpp

@@ -380,6 +380,7 @@ namespace Config
             model->known_keys_only = reader->GetBoolean("known_keys_only", false);
             model->log_chat = reader->GetBoolean("log_chat", false);
             model->log_server_actions = reader->GetBoolean("log_server_actions", false);
+            model->pause_server_if_no_clients = reader->GetBoolean("pause_server_if_no_clients", false);
         }
     }
 
@@ -404,6 +405,7 @@ namespace Config
         writer->WriteBoolean("known_keys_only", model->known_keys_only);
         writer->WriteBoolean("log_chat", model->log_chat);
         writer->WriteBoolean("log_server_actions", model->log_server_actions);
+        writer->WriteBoolean("pause_server_if_no_clients", model->pause_server_if_no_clients);
     }
 
     static void ReadNotifications(IIniReader * reader)

src/openrct2/config/Config.h

@@ -152,6 +152,7 @@ typedef struct NetworkConfiguration
     bool        known_keys_only;
     bool        log_chat;
     bool        log_server_actions;
+    bool        pause_server_if_no_clients;
 } NetworkConfiguration;
 
 typedef struct NotificationConfiguration

src/openrct2/network/Network.cpp

@@ -351,6 +351,11 @@ bool Network::BeginServer(uint16 port, const char* address)
         _advertiser = CreateServerAdvertiser(listening_port);
     }
 
+    if (gConfigNetwork.pause_server_if_no_clients)
+    {
+        game_do_command(0, 1, 0, 0, GAME_COMMAND_TOGGLE_PAUSE, 0, 0);
+    }
+
     return true;
 }
 
@@ -1502,6 +1507,10 @@ void Network::EnqueueGameAction(const GameAction *action)
 
 void Network::AddClient(ITcpSocket * socket)
 {
+    if (gConfigNetwork.pause_server_if_no_clients && game_is_paused())
+    {
+        game_do_command(0, 1, 0, 0, GAME_COMMAND_TOGGLE_PAUSE, 0, 0);
+    }
     auto connection = std::make_unique<NetworkConnection>();
     connection->Socket = socket;
     char addr[128];
@@ -1540,6 +1549,10 @@ void Network::RemoveClient(std::unique_ptr<NetworkConnection>& connection)
                           return player.get() == connection_player;
                       }), player_list.end());
     client_connection_list.remove(connection);
+    if (gConfigNetwork.pause_server_if_no_clients && game_is_not_paused() && client_connection_list.size() == 0)
+    {
+        game_do_command(0, 1, 0, 0, GAME_COMMAND_TOGGLE_PAUSE, 0, 0);
+    }
     Server_Send_PLAYERLIST();
 }