TileServer.h

/***************************************************************************
 *   Copyright (C) 2019-2024 by Stefan Kebekus                             *
 *   stefan.kebekus@gmail.com                                              *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 3 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/
 
#pragma once
 
#include "fileFormats/MBTILES.h"
#include "geomaps/TileHandler.h"
 
#include <QAbstractHttpServer>
#include <QCoreApplication>
#include <QSharedPointer>
 
 
namespace GeoMaps {

 
class TileServer : public QAbstractHttpServer
{
    Q_OBJECT
 
public:
    explicit TileServer(QObject* parent = nullptr);
 
    // Standard destructor
    ~TileServer() override = default;
 
 
 
    //
    // Properties
    //

    Q_PROPERTY(QString serverUrl READ serverUrl NOTIFY serverUrlChanged)
 
 
 
    //
    // Getter Methods
    //
 
    
    [[nodiscard]] QString serverUrl();
 
 
public slots:
    void addMbtilesFileSet(const QString& baseName, const QVector<QSharedPointer<FileFormats::MBTILES>>& MBTilesFiles);

    void removeMbtilesFileSet(const QString& baseName) {m_tileHandlers.take(baseName);}

    void removeMbtilesFileSets() {m_tileHandlers.clear();}
 
 
signals:
    void serverUrlChanged();
 
 
private:
    Q_DISABLE_COPY_MOVE(TileServer)
 
    // Implemented pure virtual method from QAbstractHttpServer
    bool handleRequest(const QHttpServerRequest& request, QHttpServerResponder& responder) override;
 
    // Implemented pure virtual method from QAbstractHttpServer
    void missingHandler(const QHttpServerRequest& request, QHttpServerResponder& responder) override;
 
#if defined(Q_OS_IOS)
    void restart();
#endif
 
#if defined(Q_OS_ANDROID)
    // Name of the local socket. QLocalServer places simple names in the
    // temporary directory; the PID keeps parallel instances apart. Lowercase
    // letters, digits and hyphens only, because the name doubles as the host
    // part of the server URL.
    const QString m_socketName {QStringLiteral("enroute-tiles-%1").arg(QCoreApplication::applicationPid())};
#endif
 
    // List of tile handlers
    QMap<QString, QSharedPointer<GeoMaps::TileHandler>> m_tileHandlers;
 
    // Night-mode sprite sheets, keyed by resource file name of the day-mode
    // original. Computing the recolored PNGs is not free, so they are cached
    // here after the first request. The transform is deterministic, so entries
    // never need to be invalidated.
    QMap<QString, QByteArray> m_nightSprites;
 
    // Internal variable. Indicates if the app has been suspended.
    // This is used on changes of QGuiApplication::applicationState,
    // to check if the application is currently awaking from sleep,
    // so that the server needs to be restarted (if on iOS).
#if defined(Q_OS_IOS)
    bool suspended = false;
#endif
};
 
} // namespace GeoMaps