Handle multiple connections from the demo user

src/ui/LmsApplication.cpp

@@ -131,7 +131,8 @@ LmsApplication::LmsApplication(const Wt::WEnvironment& env, Wt::Dbo::SqlConnecti
 	}
 }
 
-LmsApplication::~LmsApplication()
+void
+LmsApplication::finalize()
 {
 	LmsApplicationInfo info = LmsApplicationInfo::fromEnvironment(environment());
 
@@ -141,6 +142,8 @@ LmsApplication::~LmsApplication()
 	});
 
 	getApplicationGroup().leave();
+
+	preQuit().emit();
 }
 
 std::unique_ptr<Wt::WAnchor>
@@ -456,8 +459,11 @@ LmsApplication::createHome()
 	_groupEvents.appOpen.connect([=] (LmsApplicationInfo info)
 	{
 		// Only one active session by user
-		setConfirmCloseMessage("");
-		quit(Wt::WString::tr("Lms.quit-other-session"));
+		if (!LmsApp->getUser()->isDemo())
+		{
+			setConfirmCloseMessage("");
+			quit(Wt::WString::tr("Lms.quit-other-session"));
+		}
 	});
 
 	_groupEvents.appClosed.connect([=] (LmsApplicationInfo info)

src/ui/LmsApplication.hpp

@@ -48,7 +48,6 @@ class LmsApplication : public Wt::WApplication
 {
 	public:
 		LmsApplication(const Wt::WEnvironment& env, Wt::Dbo::SqlConnectionPool& connectionPool, LmsApplicationGroupContainer& appGroups, Scanner::MediaScanner& scanner);
-		~LmsApplication();
 
 		static std::unique_ptr<Wt::WApplication> create(const Wt::WEnvironment& env,
 				Wt::Dbo::SqlConnectionPool& connectionPool, LmsApplicationGroupContainer& appGroups, Scanner::MediaScanner& scanner);
@@ -77,6 +76,9 @@ class LmsApplication : public Wt::WApplication
 		static std::unique_ptr<Wt::WAnchor> createReleaseAnchor(Database::Release::pointer release, bool addText = true);
 		static std::unique_ptr<Wt::WTemplate> createCluster(Database::Cluster::pointer cluster, bool canDelete = false);
 
+		// Signal emitted just before the session ends (user may already be logged out)
+		Wt::Signal<>&	preQuit() { return _preQuit; }
+
 	private:
 
 		LmsApplicationGroup& getApplicationGroup();
@@ -84,9 +86,11 @@ class LmsApplication : public Wt::WApplication
 		// Events
 		void handleAuthEvent();
 		void notify(const Wt::WEvent& event) override;
+		void finalize() override;
 
 		void createHome();
 
+		Wt::Signal<>		_preQuit;
 		Database::Handler	_db;
 		LmsApplicationGroupContainer&   _appGroups;
 		GroupEvents		_groupEvents;

src/ui/PlayQueueView.cpp

@@ -33,6 +33,7 @@
 
 #include "LmsApplication.hpp"
 
+
 namespace UserInterface {
 
 PlayQueue::PlayQueue()
@@ -50,15 +51,8 @@ PlayQueue::PlayQueue()
 
 	Wt::WText* shuffleBtn = bindNew<Wt::WText>("shuffle-btn", Wt::WString::tr("Lms.PlayQueue.shuffle"), Wt::TextFormat::XHTML);
 	_radioMode = bindNew<Wt::WCheckBox>("radio-mode", Wt::WString::tr("Lms.PlayQueue.radio-mode"));
-
 	_nbTracks = bindNew<Wt::WText>("nb-tracks");
 
-	{
-		Wt::Dbo::Transaction transaction (LmsApp->getDboSession());
-
-		_trackPos = LmsApp->getUser()->getCurPlayingTrackPos();
-	}
-
 	clearBtn->clicked().connect([=]
 	{
 		clearTracks();
@@ -80,6 +74,20 @@ PlayQueue::PlayQueue()
 		addSome();
 	});
 
+	LmsApp->preQuit().connect([=]
+	{
+		if (_playlistId)
+		{
+			LMS_LOG(UI, DEBUG) << "Removing playlist id " << *_playlistId;
+
+			Wt::Dbo::Transaction transaction(LmsApp->getDboSession());
+
+			auto playlist = Database::Playlist::getById(LmsApp->getDboSession(), *_playlistId);
+			if (playlist)
+				playlist.remove();
+		}
+	});
+
 	updateInfo();
 	addSome();
 }
@@ -88,8 +96,22 @@ Database::Playlist::pointer
 PlayQueue::getPlaylist()
 {
 	static const std::string currentPlayQueueName = "__current__playqueue__";
+	Database::Playlist::pointer res;
 
-	Database::Playlist::pointer res = Database::Playlist::get(LmsApp->getDboSession(), currentPlayQueueName, LmsApp->getUser());
+	if (LmsApp->getUser()->isDemo())
+	{
+		if (!_playlistId)
+		{
+			res = Database::Playlist::create(LmsApp->getDboSession(), currentPlayQueueName, false, LmsApp->getUser());
+			LmsApp->getDboSession().flush();
+			_playlistId = res.id();
+			return res;
+		}
+
+		return Database::Playlist::getById(LmsApp->getDboSession(), *_playlistId);
+	}
+
+	res = Database::Playlist::get(LmsApp->getDboSession(), currentPlayQueueName, LmsApp->getUser());
 	if (!res)
 		res = Database::Playlist::create(LmsApp->getDboSession(), currentPlayQueueName, false, LmsApp->getUser());
 

src/ui/PlayQueueView.hpp

@@ -66,6 +66,7 @@ class PlayQueue : public Wt::WTemplate
 		void play(std::size_t pos);
 		void stop();
 
+		boost::optional<Database::IdType> _playlistId;
 		Wt::WCheckBox* _radioMode;
 		Wt::WContainerWidget* _entriesContainer;
 		Wt::WTemplate* _showMore;