Don't do failover for Android, try reconnecting automatically once

Issue: AOTextArea is supposed to have red text for errors, but it's not working

.gitignore

@@ -5,3 +5,5 @@
 *.so
 base_override.h
 
+base-full/
+bass.lib

aoapplication.cpp

@@ -12,7 +12,8 @@
 AOApplication::AOApplication(int &argc, char **argv) : QApplication(argc, argv)
 {
   net_manager = new NetworkManager(this);
-  QObject::connect(net_manager, SIGNAL(ms_connect_finished(bool)), SLOT(ms_connect_finished(bool)));
+  QObject::connect(net_manager, SIGNAL(ms_connect_finished(bool, bool)),
+                   SLOT(ms_connect_finished(bool, bool)));
 }
 
 AOApplication::~AOApplication()
@@ -136,7 +137,7 @@ void AOApplication::loading_cancelled()
   w_lobby->hide_loading_overlay();
 }
 
-void AOApplication::ms_connect_finished(bool connected)
+void AOApplication::ms_connect_finished(bool connected, bool will_retry)
 {
   if (connected)
   {
@@ -144,11 +145,19 @@ void AOApplication::ms_connect_finished(bool connected)
     send_ms_packet(f_packet);
   }
   else
+  {
+    if (will_retry)
+    {
+      w_lobby->append_error("Error connecting to master server. Will try again in "
+                          + QString::number(net_manager->ms_reconnect_delay_ms / 1000.f) + " seconds.");
+    }
+    else
     {
       call_error("There was an error connecting to the master server.\n"
-               "We deploy multiple master servers to mitigate any possible downtime,"
-               "but the client appears to have exhausted all possible methods of finding"
+                 "We deploy multiple master servers to mitigate any possible downtime, "
+                 "but the client appears to have exhausted all possible methods of finding "
                  "and connecting to one.\n"
                  "Please check your Internet connection and firewall, and please try again.");
     }
+  }
 }

aoapplication.h

@@ -147,7 +147,7 @@ private:
   QVector<server_type> favorite_list;
 
 private slots:
-  void ms_connect_finished(bool connected);
+  void ms_connect_finished(bool connected, bool will_retry);
 
 public slots:
   void server_disconnected();

aotextarea.cpp

@@ -7,7 +7,7 @@
 
 AOTextArea::AOTextArea(QWidget *p_parent) : QTextBrowser(p_parent)
 {
-
+  this->setStyleSheet(".error {color: #0f0}");
 }
 
 void AOTextArea::append_chatmessage(QString p_name, QString p_message)
@@ -21,81 +21,37 @@ void AOTextArea::append_chatmessage(QString p_name, QString p_message)
   this->append("");
   this->insertHtml("<b>" + p_name.toHtmlEscaped() + "</b>:&nbsp;");
 
-  //QRegExp regExp("((([A-Za-z]{3,9}:(?:\\/\\/)?)(?:[\\-;:&=\\+\\$,\\w]+@)?[A-Za-z0-9\\.\\-]+|(?:www\\.|[\\-;:&=\\+\\$,\\w]+@)[A-Za-z0-9\\.\\-]+)((?:\\/[\\+~%\\/\\.\\w\\-]*)?\\??(?:[\\-\\+=&;%@\\.\\w]*)#?(?:[\\.\\!\\/\\\\\\w]*))?)");
-
-  QRegExp omnis_dank_url_regex("\\b(https?://\\S+\\.\\S+)\\b");
-
   //cheap workarounds ahoy
   p_message += " ";
   QString result = p_message.toHtmlEscaped().replace("\n", "<br>").replace(omnis_dank_url_regex, "<a href='\\1'>\\1</a>" );
 
   this->insertHtml(result);
 
+  this->auto_scroll(old_cursor, old_scrollbar_value, is_scrolled_down);
+}
 
-  /*
-  QRegExp rx("\\bhttp://\\S+");
+void AOTextArea::append_error(QString p_message)
+{
+  const QTextCursor old_cursor = this->textCursor();
+  const int old_scrollbar_value = this->verticalScrollBar()->value();
+  const bool is_scrolled_down = old_scrollbar_value == this->verticalScrollBar()->maximum();
 
-  int first_index = rx.indexIn(p_message);
+  this->moveCursor(QTextCursor::End);
 
-  qDebug() << "number of rx indices: " << rx.captureCount();
+  this->append("");
+  this->insertHtml("<div class='error'>");
 
-  if (first_index < 0)
-  {
-    this->insertPlainText(p_message);
-    qDebug() << "NO REGEX MATCHES";
-    return;
-  }
+  p_message += " ";
+  QString result = p_message.replace("\n", "<br>").replace(omnis_dank_url_regex, "<a href='\\1'>\\1</a>" );
 
-  //indices where we found a regex match
-  QVector<int> rx_indices;
-  QStringList links = rx.capturedTexts();
+  this->insertHtml(result);
+  this->insertHtml("</div>");
 
-  qDebug() << "link size" << links.size();
-
-  rx_indices.append(first_index);
-
-
-  //start at one because first_index is already appended
-  for (int n_pos = 1 ; n_pos < rx.captureCount() ; ++n_pos)
-    rx_indices.append(rx.indexIn(p_message));
-
-  for (int msg_pos = 0 ; msg_pos < p_message.size() ; ++msg_pos)
-  {
-    int tag_index = rx_indices.indexOf(msg_pos);
-    if (tag_index < 0)
-    {
-      this->insertPlainText(p_message.at(msg_pos));
-      continue;
-    }
-
-    QString link = links.at(tag_index);
-    QString html_string = "<a href=\"" + link + "\">" + link + "</a>";
-    qDebug() << "html: " << html_string;
-
-    this->insertHtml(html_string);
-
-    msg_pos += link.size() - 1;
-
-  }
-
-  */
-
-  /*
-
-  QStringList word_list = p_message.split(" ");
-
-  for (QString i_word : word_list)
-  {
-    if (i_word.startsWith("http"))
-    {
-      i_word.replace("\n", "").replace("\r", "");
-      this->insertHtml("<a href=\"" + i_word + "\">" + i_word + "</a> ");
-    }
-    else
-      this->insertPlainText(i_word + " ");
-  }
-  */
+  this->auto_scroll(old_cursor, old_scrollbar_value, is_scrolled_down);
+}
 
+void AOTextArea::auto_scroll(QTextCursor old_cursor, int old_scrollbar_value, bool is_scrolled_down)
+{
   if (old_cursor.hasSelection() || !is_scrolled_down)
   {
       // The user has selected text or scrolled away from the bottom: maintain position.

aotextarea.h

@@ -9,6 +9,12 @@ public:
   AOTextArea(QWidget *p_parent = nullptr);
 
   void append_chatmessage(QString p_name, QString p_message);
+  void append_error(QString p_message);
+
+private:
+  const QRegExp omnis_dank_url_regex = QRegExp("\\b(https?://\\S+\\.\\S+)\\b");
+
+  void auto_scroll(QTextCursor old_cursor, int scrollbar_value, bool is_scrolled_down);
 };
 
 #endif // AOTEXTAREA_H

lobby.cpp

@@ -262,8 +262,9 @@ void Lobby::on_about_clicked()
   call_notice("Attorney Online 2 is built using Qt 5.7\n\n"
               "Lead development:\n"
               "OmniTroid\n\n"
-              "Supporting development:\n"
               "stonedDiscord\n"
+              "longbyte1\n"
+              "Supporting development:\n"
               "Fiercy\n\n"
               "UI design:\n"
               "Ruekasu\n"
@@ -357,6 +358,11 @@ void Lobby::append_chatmessage(QString f_name, QString f_message)
   ui_chatbox->append_chatmessage(f_name, f_message);
 }
 
+void Lobby::append_error(QString f_message)
+{
+  ui_chatbox->append_error(f_message);
+}
+
 void Lobby::set_player_count(int players_online, int max_players)
 {
   QString f_string = "Online: " + QString::number(players_online) + "/" + QString::number(max_players);

lobby.h

@@ -27,6 +27,7 @@ public:
   void list_servers();
   void list_favorites();
   void append_chatmessage(QString f_name, QString f_message);
+  void append_error(QString f_message);
   void set_player_count(int players_online, int max_players);
   void set_loading_text(QString p_text);
   void show_loading_overlay(){ui_loading_background->show();}

networkmanager.cpp

@@ -12,6 +12,10 @@ NetworkManager::NetworkManager(AOApplication *parent) : QObject(parent)
   ms_socket = new QTcpSocket(this);
   server_socket = new QTcpSocket(this);
 
+  ms_reconnect_timer = new QTimer(this);
+  ms_reconnect_timer->setSingleShot(true);
+  QObject::connect(ms_reconnect_timer, SIGNAL(timeout()), this, SLOT(retry_ms_connect()));
+
   QObject::connect(ms_socket, SIGNAL(readyRead()), this, SLOT(handle_ms_packet()));
   QObject::connect(server_socket, SIGNAL(readyRead()), this, SLOT(handle_server_packet()));
   QObject::connect(server_socket, SIGNAL(disconnected()), ao_app, SLOT(server_disconnected()));
@@ -27,7 +31,16 @@ void NetworkManager::connect_to_master()
   ms_socket->close();
   ms_socket->abort();
 
+#ifdef MS_FAILOVER_SUPPORTED
   perform_srv_lookup();
+#else
+  QObject::connect(ms_socket, SIGNAL(error(QAbstractSocket::SocketError)),
+                   this, SLOT(on_ms_connect_error(QAbstractSocket::SocketError)));
+
+  QObject::connect(ms_socket, SIGNAL(connected()),
+                   this, SLOT(on_ms_nosrv_connect_success()));
+  ms_socket->connectToHost(ms_nosrv_hostname, ms_port);
+#endif
 }
 
 void NetworkManager::connect_to_server(server_type p_server)
@@ -40,7 +53,14 @@ void NetworkManager::connect_to_server(server_type p_server)
 
 void NetworkManager::ship_ms_packet(QString p_packet)
 {
+  if (!ms_socket->isOpen())
+  {
+    retry_ms_connect();
+  }
+  else
+  {
     ms_socket->write(p_packet.toUtf8());
+  }
 }
 
 void NetworkManager::ship_server_packet(QString p_packet)
@@ -82,9 +102,10 @@ void NetworkManager::handle_ms_packet()
   }
 }
 
+#ifdef MS_FAILOVER_SUPPORTED
 void NetworkManager::perform_srv_lookup()
 {
-  ms_dns = new QDnsLookup(QDnsLookup::SRV, ms_hostname, this);
+  ms_dns = new QDnsLookup(QDnsLookup::SRV, ms_srv_hostname, this);
 
   connect(ms_dns, SIGNAL(finished()), this, SLOT(on_srv_lookup()));
   ms_dns->lookup();
@@ -127,7 +148,13 @@ void NetworkManager::on_srv_lookup()
           break;
         }
       } while (timer.elapsed() < timeout_milliseconds); // Very expensive spin-wait loop - it will bring CPU to 100%!
-      if (connected) break;
+      if (connected)
+      {
+        // Connect a one-shot signal in case the master server disconnects randomly
+        QObject::connect(ms_socket, SIGNAL(error(QAbstractSocket::SocketError)),
+                         this, SLOT(on_ms_socket_error(QAbstractSocket::SocketError)));
+        break;
+      }
       else
       {
         ms_socket->abort();
@@ -135,7 +162,37 @@ void NetworkManager::on_srv_lookup()
       }
     }
   }
-  emit ms_connect_finished(connected);
+  emit ms_connect_finished(connected, false);
+}
+#endif
+
+void NetworkManager::on_ms_nosrv_connect_success()
+{
+  emit ms_connect_finished(true, false);
+
+  QObject::connect(ms_socket, SIGNAL(error(QAbstractSocket::SocketError)),
+                   this, SLOT(on_ms_socket_error(QAbstractSocket::SocketError)));
+}
+
+void NetworkManager::on_ms_socket_error(QAbstractSocket::SocketError error)
+{
+  qWarning() << "Master server socket error:" << ms_socket->errorString()
+             << "(" << error << ")";
+
+  // Disconnect the one-shot signal - this way, failover connect attempts
+  // don't trigger a full retry
+  QObject::disconnect(ms_socket, SIGNAL(error(QAbstractSocket::SocketError)),
+                   this, SLOT(on_ms_socket_error(QAbstractSocket::SocketError)));
+
+  emit ms_connect_finished(false, true);
+
+  ms_reconnect_timer->start(ms_reconnect_delay_ms);
+}
+
+void NetworkManager::retry_ms_connect()
+{
+  if (!ms_reconnect_timer->isActive() && ms_socket->state() != QAbstractSocket::ConnectingState)
+    connect_to_master();
 }
 
 void NetworkManager::handle_server_packet()

networkmanager.h

@@ -1,12 +1,20 @@
 #ifndef NETWORKMANAGER_H
 #define NETWORKMANAGER_H
 
+// Qt for Android has stubbed QDnsLookup. This is not documented in any part of their wiki.
+// This prevents SRV lookup/failover behavior from functioning.
+// https://bugreports.qt.io/browse/QTBUG-56143
+#ifndef ANDROID
+#define MS_FAILOVER_SUPPORTED
+#endif
+
 #include "aopacket.h"
 #include "aoapplication.h"
 
 #include <QTcpSocket>
 #include <QDnsLookup>
 #include <QTime>
+#include <QTimer>
 
 class NetworkManager : public QObject
 {
@@ -20,11 +28,16 @@ public:
   QTcpSocket *ms_socket;
   QTcpSocket *server_socket;
   QDnsLookup *ms_dns;
+  QTimer *ms_reconnect_timer;
 
-  QString ms_hostname = "_aoms._tcp.aceattorneyonline.com";
-  int ms_port = 27016;
+  const QString ms_srv_hostname = "_aoms._tcp.aceattorneyonline.com";
+  const QString ms_nosrv_hostname = "master.aceattorneyonline.com";
+
+  const int ms_port = 27016;
   const int timeout_milliseconds = 2000;
 
+  const int ms_reconnect_delay_ms = 5000;
+
   bool ms_partial_packet = false;
   QString ms_temp_packet = "";
 
@@ -41,7 +54,7 @@ public slots:
   void ship_server_packet(QString p_packet);
 
 signals:
-  void ms_connect_finished(bool success);
+  void ms_connect_finished(bool success, bool will_retry);
 
 private:
   void perform_srv_lookup();
@@ -50,6 +63,9 @@ private slots:
   void on_srv_lookup();
   void handle_ms_packet();
   void handle_server_packet();
+  void on_ms_nosrv_connect_success();
+  void on_ms_socket_error(QAbstractSocket::SocketError error);
+  void retry_ms_connect();
 };
 
 #endif // NETWORKMANAGER_H