Dual-Stack AO2 Client to handle both TCP and Websocket connections seemlessly (#696)

* Replace TCP Serversocket with Websocket

* Have TCP sockets live harmoniously with WS

"like 5 lines" yeah probably lost a bet.

* Update .gitlab-ci.yml

* hack to fix favorites

* Add support for websockets in the favorites list (serverlist.txt)
Make "add_favorite_server" remember the socket type

* Preserve old serverlist style

This will keep new entries compatible with 2.9 and prior clients. Makes parsing the list easier too.

* Add lookup table and correct write code to use lowercase

* I have no idea what a lookup table is, but this looks close enough

* Fix lookup table

* Otherwise backend selection behaviour is inverted

* clang-tidy had one job

* Yet it did not do it.

Co-authored-by: oldmud0 <oldmud0@users.noreply.github.com>

* const p_data

* Switch serverlist.txt to an ini format

* Fixes an Omni bug where : would split the servername
* Utilises internally QSettings properly for low parsing effort and clear structure
* Automatically migrates the legacy serverlist.txt to favorite_servers.ini
* Pleases my OCD

* Replace sample serverlist.

Co-authored-by: oldmud0 <oldmud0@users.noreply.github.com>
Co-authored-by: stonedDiscord <Tukz@gmx.de>
Co-authored-by: Alex Noir <Varsash@gmail.com>

3 files changed, 36 insertions, 11 deletions

diff --git a/include/aoapplication.h b/include/aoapplication.h
index 4809c3f..4c3a83f 100644
--- a/include/aoapplication.h
+++ b/include/aoapplication.h
@@ -133,6 +133,8 @@ public:
 
   void set_favorite_list();
   QVector<server_type> &get_favorite_list() { return favorite_list; }
+
+  // Adds the server to favorite_servers.ini
   void add_favorite_server(int p_server);
 
   void set_server_list(QVector<server_type> &servers) { server_list = servers; }
@@ -324,12 +326,14 @@ public:
   // Append to the currently open demo file if there is one
   void append_to_demofile(QString packet_string);
 
-  // Appends the argument string to serverlist.txt
-  void write_to_serverlist_txt(QString p_line);
-
   // Returns the contents of serverlist.txt
   QVector<server_type> read_serverlist_txt();
 
+  /**
+   * @brief Migrates the favorite serverlist format from txt to ini.
+   */
+  void migrate_serverlist_txt(QFile &p_serverlist_txt);
+
   // Returns the value of p_identifier in the design.ini file in p_design_path
   QString read_design_ini(QString p_identifier, VPath p_design_path);
   QString read_design_ini(QString p_identifier, QString p_design_path);
diff --git a/include/datatypes.h b/include/datatypes.h
index 2f03d39..3289bd8 100644
--- a/include/datatypes.h
+++ b/include/datatypes.h
@@ -1,13 +1,25 @@
 #ifndef DATATYPES_H
 #define DATATYPES_H
 
+#include <QMap>
 #include <QString>
 
+enum connection_type {
+  TCP,
+  WEBSOCKETS,
+};
+
+static QMap<QString, connection_type> to_connection_type = {
+    {"tcp", connection_type::TCP},
+    {"ws", connection_type::WEBSOCKETS}
+};
+
 struct server_type {
   QString name;
   QString desc;
   QString ip;
   int port;
+  connection_type socket_type;
 };
 
 struct emote_type {
diff --git a/include/networkmanager.h b/include/networkmanager.h
index 26a61f2..705fb9e 100644
--- a/include/networkmanager.h
+++ b/include/networkmanager.h
@@ -6,7 +6,7 @@
 
 #include <QDnsLookup>
 #include <QNetworkAccessManager>
-#include <QTcpSocket>
+#include <QtWebSockets/QWebSocket>
 #include <QTime>
 #include <QTimer>
 
@@ -21,16 +21,20 @@ enum MSDocumentType {
 class NetworkManager : public QObject {
   Q_OBJECT
 
-public:
-  explicit NetworkManager(AOApplication *parent);
-  ~NetworkManager() = default;
-
+private:
   AOApplication *ao_app;
   QNetworkAccessManager *http;
-  QTcpSocket *server_socket;
+
+  union {
+    QWebSocket *ws;
+    QTcpSocket *tcp;
+  } server_socket;
+  connection_type active_connection_type;
+  bool connected = false;
+
   QTimer *heartbeat_timer;
 
-  const QString DEFAULT_MS_BASEURL = "https://servers.aceattorneyonline.com";
+  const QString DEFAULT_MS_BASEURL = "http://servers.aceattorneyonline.com";
   QString ms_baseurl = DEFAULT_MS_BASEURL;
 
   const int heartbeat_interval = 60 * 5 * 1000;
@@ -40,12 +44,17 @@ public:
 
   unsigned int s_decryptor = 5;
 
+public:
+  explicit NetworkManager(AOApplication *parent);
+  ~NetworkManager() = default;
+
   void connect_to_server(server_type p_server);
+  void disconnect_from_server();
 
 public slots:
   void get_server_list(const std::function<void()> &cb);
   void ship_server_packet(QString p_packet);
-  void handle_server_packet();
+  void handle_server_packet(const QString& p_data);
 
   void request_document(MSDocumentType document_type,
                         const std::function<void(QString)> &cb);