TraversalClient: Make data externally read-only members private

These are only ever queried for state, not written. Therefore, prevent writing to the members
and make them private.

Source/Core/Common/TraversalClient.cpp

@@ -32,8 +32,21 @@ TraversalClient::TraversalClient(ENetHost* netHost, const std::string& server, c
   ReconnectToServer();
 }
 
-TraversalClient::~TraversalClient()
+TraversalClient::~TraversalClient() = default;
+
+TraversalHostId TraversalClient::GetHostID() const
 {
+  return m_HostId;
+}
+
+TraversalClient::State TraversalClient::GetState() const
+{
+  return m_State;
+}
+
+TraversalClient::FailureReason TraversalClient::GetFailureReason() const
+{
+  return m_FailureReason;
 }
 
 void TraversalClient::ReconnectToServer()

Source/Core/Common/TraversalClient.h

@@ -41,6 +41,11 @@ public:
   };
   TraversalClient(ENetHost* netHost, const std::string& server, const u16 port);
   ~TraversalClient();
+
+  TraversalHostId GetHostID() const;
+  State GetState() const;
+  FailureReason GetFailureReason() const;
+
   void Reset();
   void ConnectToClient(const std::string& host);
   void ReconnectToServer();
@@ -49,11 +54,7 @@ public:
   bool TestPacket(u8* data, size_t size, ENetAddress* from);
   void HandleResends();
 
-  ENetHost* m_NetHost;
   TraversalClientClient* m_Client;
-  TraversalHostId m_HostId;
-  State m_State;
-  FailureReason m_FailureReason;
 
 private:
   struct OutgoingTraversalPacketInfo
@@ -68,6 +69,11 @@ private:
   void OnFailure(FailureReason reason);
   void HandlePing();
   static int ENET_CALLBACK InterceptCallback(ENetHost* host, ENetEvent* event);
+
+  ENetHost* m_NetHost;
+  TraversalHostId m_HostId;
+  State m_State;
+  FailureReason m_FailureReason;
   TraversalRequestId m_ConnectRequestId;
   bool m_PendingConnect;
   std::list<OutgoingTraversalPacketInfo> m_OutgoingTraversalPackets;

Source/Core/Core/NetPlayClient.cpp

@@ -134,7 +134,7 @@ NetPlayClient::NetPlayClient(const std::string& address, const u16 port, NetPlay
     m_traversal_client = g_TraversalClient.get();
 
     // If we were disconnected in the background, reconnect.
-    if (m_traversal_client->m_State == TraversalClient::Failure)
+    if (m_traversal_client->GetState() == TraversalClient::Failure)
       m_traversal_client->ReconnectToServer();
     m_traversal_client->m_Client = this;
     m_host_spec = address;
@@ -909,17 +909,18 @@ void NetPlayClient::ClearBuffers()
 // called from ---NETPLAY--- thread
 void NetPlayClient::OnTraversalStateChanged()
 {
+  const TraversalClient::State state = m_traversal_client->GetState();
+
   if (m_connection_state == ConnectionState::WaitingForTraversalClientConnection &&
-      m_traversal_client->m_State == TraversalClient::Connected)
+      state == TraversalClient::Connected)
   {
     m_connection_state = ConnectionState::WaitingForTraversalClientConnectReady;
     m_traversal_client->ConnectToClient(m_host_spec);
   }
-  else if (m_connection_state != ConnectionState::Failure &&
+  else if (m_connection_state != ConnectionState::Failure && state == TraversalClient::Failure)
-           m_traversal_client->m_State == TraversalClient::Failure)
   {
     Disconnect();
-    m_dialog->OnTraversalError(m_traversal_client->m_FailureReason);
+    m_dialog->OnTraversalError(m_traversal_client->GetFailureReason());
   }
 }
 

Source/Core/Core/NetPlayServer.cpp

@@ -90,7 +90,7 @@ NetPlayServer::NetPlayServer(const u16 port, const bool forward_port,
 
     m_server = g_MainNetHost.get();
 
-    if (g_TraversalClient->m_State == TraversalClient::Failure)
+    if (g_TraversalClient->GetState() == TraversalClient::Failure)
       g_TraversalClient->ReconnectToServer();
   }
   else
@@ -736,8 +736,8 @@ unsigned int NetPlayServer::OnData(sf::Packet& packet, Client& player)
 
 void NetPlayServer::OnTraversalStateChanged()
 {
-  if (m_dialog && m_traversal_client->m_State == TraversalClient::Failure)
+  if (m_dialog && m_traversal_client->GetState() == TraversalClient::Failure)
-    m_dialog->OnTraversalError(m_traversal_client->m_FailureReason);
+    m_dialog->OnTraversalError(m_traversal_client->GetFailureReason());
 }
 
 // called from ---GUI--- thread

Source/Core/DolphinQt2/NetPlay/NetPlayDialog.cpp

@@ -360,19 +360,22 @@ void NetPlayDialog::UpdateGUI()
   // Update Room ID / IP label
   if (m_use_traversal && m_room_box->currentIndex() == 0)
   {
-    switch (g_TraversalClient->m_State)
+    switch (g_TraversalClient->GetState())
     {
     case TraversalClient::Connecting:
       m_hostcode_label->setText(tr("..."));
       m_hostcode_action_button->setEnabled(false);
       break;
     case TraversalClient::Connected:
-      m_hostcode_label->setText(QString::fromStdString(
+    {
-          std::string(g_TraversalClient->m_HostId.data(), g_TraversalClient->m_HostId.size())));
+      const auto host_id = g_TraversalClient->GetHostID();
+      m_hostcode_label->setText(
+          QString::fromStdString(std::string(host_id.begin(), host_id.end())));
       m_hostcode_action_button->setEnabled(true);
       m_hostcode_action_button->setText(tr("Copy"));
       m_is_copy_button_retry = false;
       break;
+    }
     case TraversalClient::Failure:
       m_hostcode_label->setText(tr("Error"));
       m_hostcode_action_button->setText(tr("Retry"));

Source/Core/DolphinWX/NetPlay/NetWindow.cpp

@@ -777,7 +777,7 @@ void NetPlayDialog::UpdateHostLabel()
   if (sel == 0)
   {
     // the traversal ID
-    switch (g_TraversalClient->m_State)
+    switch (g_TraversalClient->GetState())
     {
     case TraversalClient::Connecting:
       m_host_label->SetForegroundColour(*wxLIGHT_GREY);
@@ -786,13 +786,15 @@ void NetPlayDialog::UpdateHostLabel()
       m_host_copy_btn->Disable();
       break;
     case TraversalClient::Connected:
+    {
+      const auto host_id = g_TraversalClient->GetHostID();
       m_host_label->SetForegroundColour(*wxBLACK);
-      m_host_label->SetLabel(
+      m_host_label->SetLabel(wxString(host_id.data(), host_id.size()));
-          wxString(g_TraversalClient->m_HostId.data(), g_TraversalClient->m_HostId.size()));
       m_host_copy_btn->SetLabel(_("Copy"));
       m_host_copy_btn->Enable();
       m_host_copy_btn_is_retry = false;
       break;
+    }
     case TraversalClient::Failure:
       m_host_label->SetForegroundColour(*wxBLACK);
       m_host_label->SetLabel("...");