feat: ability to register callbacks for when clients connect/disconnect

Author: david072

GhostServer/networkmanager.cpp

@@ -235,6 +235,7 @@ void NetworkManager::DisconnectPlayer(Client& c, const char *reason)
     if (toErase != -1) {
         this->clients.erase(this->clients.begin() + toErase);
         UI_EVENT("client_change");
+        OnConnectedClientsChanged();
     }
 }
 
@@ -374,6 +375,7 @@ void NetworkManager::CheckConnection()
 
     UI_EVENT("client_change");
     GHOST_LOG("Connection: " + client.name + " (" + (client.spectator ? "spectator" : "player") + ") @ " + client.IP.toString() + ":" + std::to_string(client.port));
+    OnConnectedClientsChanged();
 
     this->clients.push_back(std::move(client));
 }
@@ -658,3 +660,14 @@ bool NetworkManager::IsOnWhitelist(std::string name, sf::IpAddress IP) {
 
     return index != whitelist.end();
 }
+
+void NetworkManager::OnConnectedClientsChanged() {
+    for (auto const& [id, callback] : connectedClientsChangedCallbacks) {
+        callback();
+    }
+}
+
+int NetworkManager::RegisterConnectedClientsChangedCallback(std::function<void()> callback) {
+    connectedClientsChangedCallbacks.insert({connectedClientsChangedCallbackId++, callback});
+    return connectedClientsChangedCallbackId - 1;
+}

GhostServer/networkmanager.h

@@ -2,13 +2,14 @@
 
 #include <SFML/Network.hpp>
 
-#include <vector>
-#include <set>
-#include <mutex>
 #include <atomic>
-#include <thread>
 #include <cstdint>
 #include <functional>
+#include <map>
+#include <mutex>
+#include <set>
+#include <thread>
+#include <vector>
 
 #ifdef GHOST_GUI
 #include <QObject>
@@ -104,8 +105,13 @@ class NetworkManager
 
     sf::Clock clock;
 
+    std::map<int, std::function<void()>> connectedClientsChangedCallbacks;
+    int connectedClientsChangedCallbackId = 1;
+
     void DoHeartbeats();
 
+    void OnConnectedClientsChanged();
+
 public:
     NetworkManager(const char *logfile = "ghost_log.log");
     ~NetworkManager();
@@ -144,11 +150,12 @@ class NetworkManager
 
     bool IsOnWhitelist(std::string name, sf::IpAddress IP);
 
+    int RegisterConnectedClientsChangedCallback(std::function<void()> callback);
+    void UnregisterConnectedClientsChangedCallback(int id) { connectedClientsChangedCallbacks.erase(id); }
+
 #ifdef GHOST_GUI
 signals:
     void OnNewEvent(QString log);
     void UIEvent(std::string event);
 #endif
-
-
 };