path: root/src/location/dbuscomm_maemo.cpp

/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: Nokia Corporation (qt-info@nokia.com)
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** This file is part of the QtLocation module of the Qt Toolkit.
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** Public License version 3.0 as published by the Free Software Foundation
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** file. Please review the following information to ensure the GNU General
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****************************************************************************/

#include "dbuscomm_maemo_p.h"

#include <iostream>
using namespace std;

QT_BEGIN_NAMESPACE

const QString DBusComm::positioningdService   = QString("com.nokia.positioningd.client");
const QString DBusComm::positioningdPath      = QString("/com/nokia/positioningd/client");
const QString DBusComm::positioningdInterface = QString("com.nokia.positioningd.client");

DBusComm::DBusComm(QObject *parent) : QObject(parent), 
                                      minimumUpdateInterval(1000), 
                                      availablePositioningMethods(QGeoPositionInfoSource::AllPositioningMethods)
{
}


int DBusComm::init()
{
    if (!QDBusConnection::sessionBus().isConnected()) {
        cerr << "Cannot connect to the D-BUS session bus.\n";
        return -1;
    }

    // Application auto-start by dbus may take a while, so try
    // connecting a few times.

    int cnt = 10; 
    positioningdProxy = new QDBusInterface(positioningdService,
                                           positioningdPath,
                                           positioningdInterface,
                                           QDBusConnection::sessionBus());

    while (cnt && (positioningdProxy->isValid() == false)) {
        // cout << "Connecting to positioning daemon..." << endl;
        usleep(200000);
        positioningdProxy = new QDBusInterface(positioningdService,
                                               positioningdPath,
                                               positioningdInterface,
                                               QDBusConnection::sessionBus());
        cnt--;
    }

    if (positioningdProxy->isValid() == false) {
        cerr << "DBus connection to positioning daemon failed.\n";
        return -1;
    }
    serviceDisconnectWatcher = new QDBusServiceWatcher (positioningdService, QDBusConnection::sessionBus(), 
                                                        QDBusServiceWatcher::WatchForUnregistration, this);
    
    QObject::connect(serviceDisconnectWatcher, SIGNAL(serviceUnregistered ( const QString &)),
                     this,SLOT(onServiceDisconnect(const QString &)));

    serviceConnectWatcher = new QDBusServiceWatcher (positioningdService, QDBusConnection::sessionBus(), 
                                                     QDBusServiceWatcher::WatchForRegistration, this);
    
    QObject::connect(serviceConnectWatcher, SIGNAL(serviceRegistered ( const QString &)),
                     this,SLOT(onServiceConnect(const QString &)));
    

    if (createUniqueName() == false) { // set myService, myPath 
        return -1;
    }

    dbusServer = new DBusServer(&serverObj, this);
    QDBusConnection::sessionBus().registerObject(myPath, &serverObj);
    if (!QDBusConnection::sessionBus().registerService(myService)) {
        cerr << qPrintable(QDBusConnection::sessionBus().lastError().message()) << endl;
        return -1;
    }

    sendDBusRegister();

    return 0;
}


void DBusComm::onServiceDisconnect(const QString &name)
{
    Q_UNUSED(name);
    emit serviceDisconnected();
}


void DBusComm::onServiceConnect(const QString &name)
{
    Q_UNUSED(name);
    sendDBusRegister();
    emit serviceConnected();
}


void DBusComm::receivePositionUpdate(const QGeoPositionInfo &update)
{
    emit receivedPositionUpdate(update);
}


void DBusComm::receiveSatellitesInView(const QList<QGeoSatelliteInfo> &info)
{
    emit receivedSatellitesInView(info);
}


void DBusComm::receiveSatellitesInUse(const QList<QGeoSatelliteInfo> &info)
{
    emit receivedSatellitesInUse(info);
}


void DBusComm::receiveSettings(QGeoPositionInfoSource::PositioningMethod methods, qint32 interval)
{
    availablePositioningMethods = methods;
    minimumUpdateInterval = interval;
}


bool DBusComm::sendDBusRegister()
{
    QDBusMessage reply = positioningdProxy->call("registerListener",
                                                 myService.toAscii().constData(),
                                                 myPath.toAscii().constData());
    if (reply.type() == QDBusMessage::ReplyMessage) {
        QList<QVariant> values = reply.arguments();
        clientId = values.takeFirst().toInt();
        quint32 m = values.takeFirst().toUInt();
        availablePositioningMethods = (QGeoPositionInfoSource::PositioningMethod) m;
        minimumUpdateInterval = values.takeFirst().toUInt();
    } else {
        cerr << endl << "DBus error:\n";
        cerr << reply.errorName().toAscii().constData() << endl;
        cerr << reply.errorMessage().toAscii().constData() << endl;
        return false;
    }

    return true;
}


QGeoPositionInfoSource::PositioningMethods DBusComm::availableMethods() const
{
    return availablePositioningMethods;
}


int DBusComm::minimumInterval() const
{
    return minimumUpdateInterval;
}


bool DBusComm::sendConfigRequest(Command command, QGeoPositionInfoSource::PositioningMethods method,
                                 int interval) const
{
    QDBusReply<int> reply; 
    reply = positioningdProxy->call("configSession", clientId, command, int(method), interval);
    
    //cout << "sessionConfigRequest cmd: cmd:" << command << " method: ";
    //cout << method << " interval: " << interval << "\n";
    
    if (reply.isValid()) {
        int n = reply.value();
    } else {
        cerr << endl << "DBus error:\n";
        cerr << reply.error().name().toAscii().constData() << endl;
        cerr << reply.error().message().toAscii().constData() << endl;
        return false;
    }

    return true;
}


QGeoPositionInfo& DBusComm::requestLastKnownPosition(bool satelliteMethodOnly)
{
    QDBusReply<QByteArray> reply; 
    reply = positioningdProxy->call("latestPosition", satelliteMethodOnly);
    static QGeoPositionInfo update;

    if (reply.isValid()) {
        // cout << "requestLastKnownPosition(): received update\n";
        QByteArray message = reply.value();
        QDataStream stream(message);
        stream >> update;
    } else {
        cerr << endl << "DBus error:\n";
        cerr << reply.error().name().toAscii().constData() << endl;
        cerr << reply.error().message().toAscii().constData() << endl;
        update = QGeoPositionInfo();
    }

    return update;
} 


bool DBusComm::createUniqueName()
{
    QFile uuidfile("/proc/sys/kernel/random/uuid");
    if (!uuidfile.open(QIODevice::ReadOnly)) {
        cerr << "UUID file failed.";
        return false;
    }

    QTextStream in(&uuidfile);
    QString uuid = 'I' + in.readLine();
    uuid.replace('-', 'I');
    myService   = "com.nokia.qlocation." + uuid;
    myPath      = "/com/nokia/qlocation/" + uuid;

    return true;
}

#include "moc_dbuscomm_maemo_p.cpp"
QT_END_NAMESPACE