Refactor DBus IPC to allow for further extensibility

qt/DBusInteropHelper.cc

@@ -0,0 +1,56 @@
+/*
+ * This file Copyright (C) 2015 Mnemosyne LLC
+ *
+ * It may be used under the GNU GPL versions 2 or 3
+ * or any future license endorsed by Mnemosyne LLC.
+ *
+ * $Id$
+ */
+
+#include <iostream>
+
+#include <QDBusConnection>
+#include <QDBusMessage>
+#include <QDBusReply>
+#include <QString>
+#include <QVariant>
+
+#include "DBusInteropHelper.h"
+#include "InteropObject.h"
+
+namespace
+{
+  const QLatin1String DBUS_SERVICE ("com.transmissionbt.Transmission");
+  const QLatin1String DBUS_OBJECT_PATH ("/com/transmissionbt/Transmission");
+  const QLatin1String DBUS_INTERFACE ("com.transmissionbt.Transmission");
+}
+
+bool
+DBusInteropHelper::isConnected () const
+{
+  return !QDBusConnection::sessionBus ().isConnected ();
+}
+
+QVariant
+DBusInteropHelper::addMetainfo (const QString& metainfo)
+{
+  QDBusMessage request = QDBusMessage::createMethodCall (DBUS_SERVICE, DBUS_OBJECT_PATH,
+                                                         DBUS_INTERFACE, QLatin1String ("AddMetainfo"));
+  request.setArguments (QVariantList () << metainfo);
+
+  const QDBusReply<bool> response = QDBusConnection::sessionBus ().call (request);
+  return response.isValid () ? QVariant (response.value ()) : QVariant ();
+}
+
+void
+DBusInteropHelper::registerObject (QObject * parent)
+{
+  QDBusConnection bus = QDBusConnection::sessionBus ();
+  if (!bus.isConnected ())
+    return;
+
+  if (!bus.registerService (DBUS_SERVICE))
+    std::cerr << "couldn't register " << qPrintable (DBUS_SERVICE) << std::endl;
+  if (!bus.registerObject (DBUS_OBJECT_PATH, new InteropObject (parent), QDBusConnection::ExportAllSlots))
+    std::cerr << "couldn't register " << qPrintable (DBUS_OBJECT_PATH) << std::endl;
+}