lcdserver.cpp

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/*
    lcdserver.cpp
 
    Methods for the core lcdserver object
*/
 
 
/*
    Command list
 
    SWITCH_TO_TIME
    SWITCH_TO_MUSIC "Artist" "Album" "Track"
    SWITCH_TO_VOLUME "AppName"
    SWITCH_TO_CHANNEL "ChanNum" "Title" "SubTitle"
    SWITCH_TO_NOTHING
    SWITCH_TO_MENU AppName popup ["Text" Checked Selected Scroll Indent ...]
        AppName is a string
        Popup can be TRUE or FALSE
        Text is a string
        Checked can be CHECKED, UNCHECKED, NOTCHECKABLE
        Selected can be TRUE or FALSE
        Scroll can be TRUE or FALSE
        Indent is an integer
        ... repeat as required
 
    SWITCH_TO_GENERIC RowNo Align "Text" "Screen" Scrollable ...
        RowNo is an integer
        Align can be ALIGN_LEFT, ALIGN_RIGHT, ALIGN_CENTERED
        Scrollable can be TRUE or FALSE
        ... repeat as required
 
    SET_VOLUME_LEVEL <level>
        level is a float between 0.0 and 1.0
 
    SET_CHANNEL_PROGRESS <progress>
        progress is a float between 0.0 and 1.0
 
    SET_MUSIC_PROGRESS "Time" <progress>
        time is a string
        progress is a float between 0.0 and 1.0
 
    SET_MUSIC_PLAYER_PROP <field> <val>
        field is a string, currently SHUFFLE or REPEAT
        val depends on field, currently integer
 
    SET_GENERIC_PROGRESS <busy> <progress>
        busy is 0 for busy spinner, 0 for normal progess bar
        progress is a float between 0.0 and 1.0
 
    UPDATE_LEDS
 
    STOP_ALL
 
    RESET
 
*/
 
// c/c++
#include <cstdlib>
#include <utility>
 
//qt
#include <QCoreApplication>
#include <QDir>
#include <QList>
#include <QStringList>
 
// mythtv
#include "libmyth/mythcontext.h"
#include "libmythbase/lcddevice.h"
#include "libmythbase/mythdate.h"
 
// mythlcdserver
#include "lcdserver.h"
 
int debug_level = 0;
 
#define LOC      QString("LCDServer: ")
#define LOC_WARN QString("LCDServer, Warning: ")
#define LOC_ERR  QString("LCDServer, Error: ")
 
LCDServer::LCDServer(int port, QString message, std::chrono::seconds messageTime)
    : m_lcd(new LCDProcClient(this)),
     m_serverPool(new ServerPool())
{
    if (!m_lcd->SetupLCD())
    {
        delete m_lcd;
        m_lcd = nullptr;
    }
 
    connect(m_serverPool, &ServerPool::newConnection,
            this,         &LCDServer::newConnection);
 
    if (!m_serverPool->listen(port))
    {
        LOG(VB_GENERAL, LOG_ERR, "There is probably a copy of mythlcdserver "
            "already running. You can verify this by running: \n"
            "'ps ax | grep mythlcdserver'");
        delete m_serverPool;
        return;
    }
 
    if (m_lcd)
        m_lcd->setStartupMessage(std::move(message), messageTime);
}
 
void LCDServer::newConnection(QTcpSocket *socket)
{
    connect(socket, &QIODevice::readyRead,
            this,   &LCDServer::readSocket);
    connect(socket, &QAbstractSocket::disconnected,
            this,   &LCDServer::endConnection);
 
    if (debug_level > 0)
        LOG(VB_NETWORK, LOG_INFO, "LCDServer: new connection");
 
    if (m_lcd)
        m_lcd->switchToTime();
}
 
void LCDServer::endConnection(void)
{
    auto *socket = qobject_cast<QTcpSocket*>(sender());
    if (socket)
    {
        socket->close();
        socket->deleteLater();
        if (debug_level > 0)
            LOG(VB_NETWORK, LOG_INFO, "LCDServer: close connection");
    }
 
    if (m_lastSocket == socket)
        m_lastSocket = nullptr;
}
 
void LCDServer::readSocket()
{
    auto *socket = qobject_cast<QTcpSocket*>(sender());
    if (socket)
    {
        m_lastSocket = socket;
 
        while(socket->canReadLine())
        {
            QString incoming_data = socket->readLine();
            incoming_data = incoming_data.remove("\n");
            incoming_data = incoming_data.remove("\r");
            incoming_data = incoming_data.simplified();
            QStringList tokens = parseCommand(incoming_data);
            parseTokens(tokens, socket);
        }
    }
}
 
QStringList LCDServer::parseCommand(QString &command)
{
    QStringList tokens;
    QString s = "";
    QChar c;
    bool bInString = false;
 
    for (auto && x : std::as_const(command))
    {
        c = x;
        if (!bInString && c == '"')
            bInString = true;
        else if (bInString && c == '"')
            bInString = false;
        else if (!bInString && c == ' ')
        {
            tokens.append(s);
            s = "";
        }
        else
            s = s + c;
    }
 
    tokens.append(s);
 
    return tokens;
}
 
void LCDServer::parseTokens(const QStringList &tokens, QTcpSocket *socket)
{
    //
    //  parse commands coming in from the socket
    //
 
    if (tokens[0] == "HALT" ||
       tokens[0] == "QUIT" ||
       tokens[0] == "SHUTDOWN")
    {
        shutDown();
    }
    else if (tokens[0] == "HELLO")
    {
        sendConnected(socket);
    }
    else if (tokens[0] == "SWITCH_TO_TIME")
    {
        switchToTime(socket);
    }
    else if (tokens[0] == "SWITCH_TO_MUSIC")
    {
        switchToMusic(tokens, socket);
    }
    else if (tokens[0] == "SWITCH_TO_VOLUME")
    {
        switchToVolume(tokens, socket);
    }
    else if (tokens[0] == "SWITCH_TO_GENERIC")
    {
        switchToGeneric(tokens, socket);
    }
    else if (tokens[0] == "SWITCH_TO_MENU")
    {
        switchToMenu(tokens, socket);
    }
    else if (tokens[0] == "SWITCH_TO_CHANNEL")
    {
        switchToChannel(tokens, socket);
    }
    else if (tokens[0] == "SWITCH_TO_NOTHING")
    {
        switchToNothing(socket);
    }
    else if (tokens[0] == "SET_VOLUME_LEVEL")
    {
        setVolumeLevel(tokens, socket);
    }
    else if (tokens[0] == "SET_GENERIC_PROGRESS")
    {
        setGenericProgress(tokens, socket);
    }
    else if (tokens[0] == "SET_MUSIC_PROGRESS")
    {
        setMusicProgress(tokens, socket);
    }
    else if (tokens[0] == "SET_MUSIC_PLAYER_PROP")
    {
        setMusicProp(tokens, socket);
    }
    else if (tokens[0] == "SET_CHANNEL_PROGRESS")
    {
        setChannelProgress(tokens, socket);
    }
    else if (tokens[0] == "UPDATE_LEDS")
    {
        updateLEDs(tokens, socket);
    }
    else if (tokens[0] == "STOP_ALL")
    {
        if (m_lcd)
            m_lcd->stopAll();
    }
    else if (tokens[0] == "RESET")
    {
        // reset lcd & reload settings
        if (m_lcd)
            m_lcd->reset();
    }
    else
    {
        QString did_not_parse = tokens.join(" ");
 
        if (debug_level > 0)
            LOG(VB_GENERAL, LOG_ERR, "LCDServer::failed to parse this: " +
                did_not_parse);
 
        sendMessage(socket, "HUH?");
    }
}
 
void LCDServer::shutDown()
{
    if (debug_level > 0)
        LOG(VB_GENERAL, LOG_INFO, "LCDServer:: shuting down");
 
    m_serverPool->disconnect();
    m_serverPool->close();
    delete m_serverPool;
    m_serverPool = nullptr;
 
    exit(0);
}
 
void LCDServer::sendMessage(QTcpSocket *where, const QString &what)
{
    QString message = what;
    message.append("\n");
    QByteArray tmp = message.toUtf8();
    where->write(tmp.constData(), tmp.length());
}
 
void LCDServer::sendKeyPress(const QString& key_pressed)
{
    if (debug_level > 0)
        LOG(VB_GENERAL, LOG_INFO, "LCDServer:: send key press: " + key_pressed);
 
    // send key press to last client that sent us a message
    if (m_lastSocket)
        sendMessage(m_lastSocket, "KEY " + key_pressed);
}
 
void LCDServer::sendConnected(QTcpSocket *socket)
{
    QString sWidth;
    QString sHeight;
    int nWidth = 0;
    int nHeight = 0;
 
    if (m_lcd)
    {
        nWidth = m_lcd->getLCDWidth();
        nHeight = m_lcd->getLCDHeight();
    }
 
    sWidth = sWidth.setNum(nWidth);
    sHeight = sHeight.setNum(nHeight);
 
    sendMessage(socket, "CONNECTED " + sWidth + " " + sHeight);
}
 
void LCDServer::switchToTime(QTcpSocket *socket)
{
    if (debug_level > 0)
        LOG(VB_GENERAL, LOG_INFO, "LCDServer:: SWITCH_TO_TIME");
 
    if (m_lcd)
        m_lcd->switchToTime();
 
    sendMessage(socket, "OK");
}
 
void LCDServer::switchToMusic(const QStringList &tokens, QTcpSocket *socket)
{
    if (debug_level > 0)
        LOG(VB_GENERAL, LOG_INFO, "LCDServer: SWITCH_TO_MUSIC");
 
    QString flat = tokens.join(" ");
 
    if (tokens.count() != 4)
    {
        LOG(VB_GENERAL, LOG_ERR,
            "LCDServer: bad SWITCH_TO_MUSIC command: " + flat);
        sendMessage(socket, "HUH?");
        return;
    }
 
    if (m_lcd)
        m_lcd->switchToMusic(tokens[1], tokens[2], tokens[3]);
 
    sendMessage(socket, "OK");
}
 
void LCDServer::switchToGeneric(const QStringList &tokens, QTcpSocket *socket)
{
    if (debug_level > 0)
        LOG(VB_GENERAL, LOG_INFO, "LCDServer: SWITCH_TO_GENERIC");
 
    QString flat = tokens.join(" ");
 
    if ((tokens.count() - 1) % 5 != 0)
    {
        LOG(VB_GENERAL, LOG_ERR,
            "LCDServer: bad no. of args SWITCH_TO_GENERIC command: " + flat);
        sendMessage(socket, "HUH?");
        return;
    }
 
    QList<LCDTextItem> items;
 
    for (int x = 1; x < tokens.count(); x += 5)
    {
        bool bOK = false;
        int row = tokens[x].toInt(&bOK);
        if (!bOK)
        {
            LOG(VB_GENERAL, LOG_ERR,
                "LCDServer: bad row no. in SWITCH_TO_GENERIC "
                    "command: " + tokens[x]);
            sendMessage(socket, "HUH?");
            return;
        }
 
        TEXT_ALIGNMENT align = ALIGN_LEFT;
        if (tokens[x + 1] == "ALIGN_LEFT")
            align = ALIGN_LEFT;
        else if (tokens[x + 1] == "ALIGN_RIGHT")
            align = ALIGN_RIGHT;
        else if (tokens[x + 1] == "ALIGN_CENTERED")
            align = ALIGN_CENTERED;
        else
        {
            LOG(VB_GENERAL, LOG_ERR,
                "LCDServer: bad align in SWITCH_TO_GENERIC command: " +
                tokens[x + 1]);
            sendMessage(socket, "HUH?");
            return;
        }
 
        const QString& text = tokens[x + 2];
        const QString& screen = tokens[x + 3];
        bool scrollable = false;
        if (tokens[x + 4] == "TRUE")
            scrollable = true;
        else if (tokens[x + 4] == "FALSE")
            scrollable = false;
        else
        {
            LOG(VB_GENERAL, LOG_ERR,
                "LCDServer: bad scrollable bool in SWITCH_TO_GENERIC "
                "command: " + tokens[x + 4]);
            sendMessage(socket, "HUH?");
            return;
        }
 
        items.append(LCDTextItem(row, align, text, screen, scrollable));
    }
 
    if (m_lcd)
        m_lcd->switchToGeneric(&items);
 
    sendMessage(socket, "OK");
}
 
void LCDServer::switchToChannel(const QStringList &tokens, QTcpSocket *socket)
{
    if (debug_level > 0)
        LOG(VB_GENERAL, LOG_INFO, "LCDServer: SWITCH_TO_CHANNEL");
 
    QString flat = tokens.join(" ");
 
    if (tokens.count() != 4)
    {
        LOG(VB_GENERAL, LOG_ERR,
            "LCDServer: bad SWITCH_TO_CHANNEL command: " + flat);
        sendMessage(socket, "HUH?");
        return;
    }
 
    if (m_lcd)
        m_lcd->switchToChannel(tokens[1], tokens[2], tokens[3]);
 
    sendMessage(socket, "OK");
}
 
void LCDServer::switchToVolume(const QStringList &tokens, QTcpSocket *socket)
{
    if (debug_level > 0)
        LOG(VB_GENERAL, LOG_INFO, "LCDServer: SWITCH_TO_VOLUME");
 
    QString flat = tokens.join(" ");
 
    if (tokens.count() != 2)
    {
        LOG(VB_GENERAL, LOG_ERR,
            "LCDServer: bad SWITCH_TO_VOLUME command: " + flat);
        sendMessage(socket, "HUH?");
        return;
    }
 
    if (m_lcd)
        m_lcd->switchToVolume(tokens[1]);
 
    sendMessage(socket, "OK");
}
 
void LCDServer::switchToNothing(QTcpSocket *socket)
{
    if (debug_level > 0)
        LOG(VB_GENERAL, LOG_INFO, "LCDServer: SWITCH_TO_NOTHING");
 
    if (m_lcd)
        m_lcd->switchToNothing();
 
    sendMessage(socket, "OK");
}
 
void LCDServer::switchToMenu(const QStringList &tokens, QTcpSocket *socket)
{
    if (debug_level > 0)
        LOG(VB_GENERAL, LOG_INFO,
            QString("LCDServer: SWITCH_TO_MENU: %1").arg(tokens.count()));
 
    QString flat = tokens.join(" ");
 
    if ((tokens.count() - 3) % 5 != 0)
    {
        LOG(VB_GENERAL, LOG_ERR,
            "LCDServer: bad no. of args SWITCH_TO_MENU command: " + flat);
        sendMessage(socket, "HUH?");
        return;
    }
 
    const QString& appName = tokens[1];
 
    bool bPopup = false;
    if (tokens[2] == "TRUE")
        bPopup = true;
    else if (tokens[2] == "FALSE")
        bPopup = false;
    else
    {
        LOG(VB_GENERAL, LOG_ERR,
            "LCDServer: bad popup bool in SWITCH_TO_MENU command: " +
             tokens[2]);
        sendMessage(socket, "HUH?");
        return;
    }
 
    QList<LCDMenuItem> items;
 
    for (int x = 3; x < tokens.count(); x += 5)
    {
        const QString& text = tokens[x];
 
        CHECKED_STATE checked = CHECKED;
        if (tokens[x + 1] == "CHECKED")
            checked = CHECKED;
        else if (tokens[x + 1] == "UNCHECKED")
            checked = UNCHECKED;
        else if (tokens[x + 1] == "NOTCHECKABLE")
            checked = NOTCHECKABLE;
        else
        {
            LOG(VB_GENERAL, LOG_ERR,
                "LCDServer: bad checked state in SWITCH_TO_MENU command: " +
                tokens[x + 1]);
            sendMessage(socket, "HUH?");
            return;
        }
 
        bool selected = false;
        if (tokens[x + 2] == "TRUE")
            selected = true;
        else if (tokens[x + 2] == "FALSE")
            selected = false;
        else
        {
            LOG(VB_GENERAL, LOG_ERR,
                "LCDServer: bad selected state in SWITCH_TO_MENU command: " +
                tokens[x + 2]);
            sendMessage(socket, "HUH?");
            return;
        }
 
        bool scrollable = false;
        if (tokens[x + 3] == "TRUE")
            scrollable = true;
        else if (tokens[x + 3] == "FALSE")
            scrollable = false;
        else
        {
            LOG(VB_GENERAL, LOG_ERR,
                "LCDServer: bad scrollable bool in SWITCH_TO_MENU command: " +
                tokens[x + 3]);
            sendMessage(socket, "HUH?");
            return;
        }
 
        bool bOK = false;
        int indent = tokens[x + 4].toInt(&bOK);
        if (!bOK)
        {
            LOG(VB_GENERAL, LOG_ERR,
                "LCDServer: bad indent in SWITCH_TO_MENU command: " +
                tokens[x + 4]);
            sendMessage(socket, "HUH?");
            return;
        }
 
        items.append(LCDMenuItem(selected, checked, text, indent, scrollable));
    }
 
    if (m_lcd)
        m_lcd->switchToMenu(&items, appName, bPopup);
 
    sendMessage(socket, "OK");
}
 
void LCDServer::setChannelProgress(const QStringList &tokens, QTcpSocket *socket)
{
    if (debug_level > 0)
        LOG(VB_GENERAL, LOG_INFO, "LCDServer: SET_CHANNEL_PROGRESS");
 
    QString flat = tokens.join(" ");
 
    if (tokens.count() != 3)
    {
        LOG(VB_GENERAL, LOG_ERR,
            "LCDServer: bad SET_CHANNEL_PROGRESS command: " + flat);
        sendMessage(socket, "HUH?");
        return;
    }
 
    bool bOK = false;
    float progress = tokens[2].toFloat(&bOK);
    if (!bOK)
    {
        LOG(VB_GENERAL, LOG_ERR,
            QString("LCDServer: bad float value in SET_CHANNEL_PROGRESS "
                    "command: %1").arg(tokens[2]));
        sendMessage(socket, "HUH?");
        return;
    }
 
    if (m_lcd)
        m_lcd->setChannelProgress(tokens[1], progress);
 
    sendMessage(socket, "OK");
}
 
void LCDServer::setGenericProgress(const QStringList &tokens, QTcpSocket *socket)
{
    if (debug_level > 0)
        LOG(VB_GENERAL, LOG_INFO, "LCDServer: SET_GENERIC_PROGRESS");
 
    QString flat = tokens.join(" ");
 
    if (tokens.count() != 3)
    {
        LOG(VB_GENERAL, LOG_ERR,
            "LCDServer: bad SET_GENERIC_PROGRESS command: " + flat);
        sendMessage(socket, "HUH?");
        return;
    }
 
    bool bOK = false;
    bool busy = tokens[1].toInt(&bOK) != 0;
    if (!bOK)
    {
        LOG(VB_GENERAL, LOG_ERR,
            QString("LCDServer: bad bool value in SET_GENERIC_PROGRESS "
                    "command: %1 %2").arg(tokens[1], tokens[2]));
        sendMessage(socket, "HUH?");
        return;
    }
    float progress = tokens[2].toFloat(&bOK);
    if (!bOK)
    {
        LOG(VB_GENERAL, LOG_ERR,
            QString("LCDServer: bad float value in SET_GENERIC_PROGRESS "
                    "command: %1").arg(tokens[2]));
        sendMessage(socket, "HUH?");
        return;
    }
 
    if (m_lcd)
        m_lcd->setGenericProgress(busy, progress);
 
    sendMessage(socket, "OK");
}
 
void LCDServer::setMusicProgress(const QStringList &tokens, QTcpSocket *socket)
{
    if (debug_level > 0)
        LOG(VB_GENERAL, LOG_INFO, "LCDServer: SET_MUSIC_PROGRESS");
 
    QString flat = tokens.join(" ");
 
    if (tokens.count() != 3)
    {
        LOG(VB_GENERAL, LOG_ERR,
            "LCDServer: bad SET_MUSIC_PROGRESS command: " + flat);
        sendMessage(socket, "HUH?");
        return;
    }
 
    bool bOK = false;
    float progress = tokens[2].toFloat(&bOK);
    if (!bOK)
    {
        LOG(VB_GENERAL, LOG_ERR,
            "LCDServer: bad float value in SET_MUSIC_PROGRESS command: " +
            tokens[2]);
        sendMessage(socket, "HUH?");
        return;
    }
 
    if (m_lcd)
        m_lcd->setMusicProgress(tokens[1], progress);
 
    sendMessage(socket, "OK");
}
 
void LCDServer::setMusicProp(const QStringList &tokens, QTcpSocket *socket)
{
    if (debug_level > 0)
        LOG(VB_GENERAL, LOG_INFO, "LCDServer: SET_MUSIC_PROP");
 
    QString flat = tokens.join(" ");
 
    if (tokens.count() < 3)
    {
        LOG(VB_GENERAL, LOG_ERR,
            "LCDServer: bad SET_MUSIC_PROP command: " + flat);
        sendMessage(socket, "HUH?");
        return;
    }
 
    if (tokens[1] == "SHUFFLE")
    {
        if (tokens.count () != 3)
        {
            LOG(VB_GENERAL, LOG_ERR,
                "LCDServer: missing argument for SET_MUSIC_PROP SHUFFLE "
                "command: " + flat);
            sendMessage(socket, "HUH?");
            return;
        }
        bool bOk = false;
        int state = tokens[2].toInt (&bOk);
        if (!bOk)
        {
            LOG(VB_GENERAL, LOG_ERR,
                "LCDServer: bad argument for SET_MUSIC_PROP SHUFFLE "
                "command: " + tokens[2]);
            sendMessage(socket, "HUH?");
            return;
        }
        if (m_lcd)
            m_lcd->setMusicShuffle (state);
    }
    else if (tokens[1] == "REPEAT")
    {
        if (tokens.count () != 3)
        {
            LOG(VB_GENERAL, LOG_ERR,
                "LCDServer: missing argument for SET_MUSIC_PROP REPEAT "
                "command: " + flat);
            sendMessage(socket, "HUH?");
            return;
        }
        bool bOk = false;
        int state = tokens[2].toInt (&bOk);
        if (!bOk)
        {
            LOG(VB_GENERAL, LOG_ERR,
                "LCDServer: bad argument for SET_MUSIC_PROP REPEAT command: " +
                tokens[2]);
            sendMessage(socket, "HUH?");
            return;
        }
        if (m_lcd)
            m_lcd->setMusicRepeat (state);
    }
    else
    {
        LOG(VB_GENERAL, LOG_ERR,
            "LCDServer: bad argument for SET_MUSIC_PROP command: " + tokens[1]);
        sendMessage(socket, "HUH?");
        return;
    }
 
    sendMessage(socket, "OK");
}
 
void LCDServer::setVolumeLevel(const QStringList &tokens, QTcpSocket *socket)
{
    if (debug_level > 0)
        LOG(VB_GENERAL, LOG_INFO, "LCDServer: SET_VOLUME_LEVEL");
 
    QString flat = tokens.join(" ");
 
    if (tokens.count() != 2)
    {
        LOG(VB_GENERAL, LOG_ERR,
            "LCDServer: bad SET_VOLUME_LEVEL command: " + flat);
        sendMessage(socket, "HUH?");
        return;
    }
 
    bool bOK = false;
    float progress = tokens[1].toFloat(&bOK);
    if (!bOK)
    {
        LOG(VB_GENERAL, LOG_ERR,
            "LCDServer: bad float value in SET_VOLUME_LEVEL command: " +
            tokens[1]);
        sendMessage(socket, "HUH?");
        return;
    }
 
    if (m_lcd)
        m_lcd->setVolumeLevel(progress);
 
    sendMessage(socket, "OK");
}
 
void LCDServer::updateLEDs(const QStringList &tokens, QTcpSocket *socket)
{
    if (debug_level > 0)
        LOG(VB_GENERAL, LOG_INFO, "LCDServer: UPDATE_LEDS");
 
    QString flat = tokens.join(" ");
 
    if (tokens.count() != 2)
    {
        LOG(VB_GENERAL, LOG_ERR, "LCDServer: bad UPDATE_LEDs command: " + flat);
        sendMessage(socket, "HUH?");
        return;
    }
 
    bool bOK = false;
    int mask = tokens[1].toInt(&bOK);
    if (!bOK)
    {
        LOG(VB_GENERAL, LOG_ERR,
            "LCDServer: bad mask in UPDATE_LEDS command: " + tokens[1]);
        sendMessage(socket, "HUH?");
        return;
    }
 
    if (m_lcd)
        m_lcd->updateLEDs(mask);
 
    sendMessage(socket, "OK");
}