exam_timer_teacher/qtsingleapplication/qtlocalpeer.cpp

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#include "qtlocalpeer.h"

#include <QCoreApplication>
#include <QDataStream>
#include <QTime>

#if defined(Q_OS_WIN)
#include <QLibrary>
#include <qt_windows.h>
typedef BOOL(WINAPI*PProcessIdToSessionId)(DWORD,DWORD*);
static PProcessIdToSessionId pProcessIdToSessionId = 0;
#endif

#if defined(Q_OS_UNIX)
#include <time.h>
#include <unistd.h>
#endif

namespace SharedTools {

static const char ack[] = "ack";

QString QtLocalPeer::appSessionId(const QString &appId)
{
    QByteArray idc = appId.toUtf8();
#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
    quint16 idNum = qChecksum(idc);
#else
    quint16 idNum = qChecksum(idc.constData(), idc.size());
#endif

    //### could do: two 16bit checksums over separate halves of id, for a 32bit result - improved uniqeness probability. Every-other-char split would be best.

    QString res = QLatin1String("qtsingleapplication-")
                 + QString::number(idNum, 16);
#if defined(Q_OS_WIN)
    if (!pProcessIdToSessionId) {
        QLibrary lib(QLatin1String("kernel32"));
        pProcessIdToSessionId = (PProcessIdToSessionId)lib.resolve("ProcessIdToSessionId");
    }
    if (pProcessIdToSessionId) {
        DWORD sessionId = 0;
        pProcessIdToSessionId(GetCurrentProcessId(), &sessionId);
        res += QLatin1Char('-') + QString::number(sessionId, 16);
    }
#else
    res += QLatin1Char('-') + QString::number(::getuid(), 16);
#endif
    return res;
}

QtLocalPeer::QtLocalPeer(QObject *parent, const QString &appId)
    : QObject(parent), id(appId)
{
    if (id.isEmpty())
        id = QCoreApplication::applicationFilePath();  //### On win, check if this returns .../argv[0] without casefolding; .\MYAPP == .\myapp on Win

    socketName = appSessionId(id);
    server = new QLocalServer(this);
    QString lockName = QDir(QDir::tempPath()).absolutePath()
                       + QLatin1Char('/') + socketName
                       + QLatin1String("-lockfile");
    lockFile.setFileName(lockName);
    lockFile.open(QIODevice::ReadWrite);
}

bool QtLocalPeer::isClient()
{
    if (lockFile.isLocked())
        return false;

    if (!lockFile.lock(QtLockedFile::WriteLock, false))
        return true;

    if (!QLocalServer::removeServer(socketName))
        qWarning("QtSingleCoreApplication: could not cleanup socket");
    bool res = server->listen(socketName);
    if (!res)
        qWarning("QtSingleCoreApplication: listen on local socket failed, %s", qPrintable(server->errorString()));
    QObject::connect(server, &QLocalServer::newConnection, this, &QtLocalPeer::receiveConnection);
    return false;
}

bool QtLocalPeer::sendMessage(const QString &message, int timeout, bool block)
{
    if (!isClient())
        return false;

    QLocalSocket socket;
    bool connOk = false;
    for (int i = 0; i < 2; i++) {
        // Try twice, in case the other instance is just starting up
        socket.connectToServer(socketName);
        connOk = socket.waitForConnected(timeout/2);
        if (connOk || i)
            break;
        int ms = 250;
#if defined(Q_OS_WIN)
        Sleep(DWORD(ms));
#else
        struct timespec ts = {ms / 1000, (ms % 1000) * 1000 * 1000};
        nanosleep(&ts, NULL);
#endif
    }
    if (!connOk)
        return false;

    QByteArray uMsg(message.toUtf8());
    QDataStream ds(&socket);
    ds.writeBytes(uMsg.constData(), uMsg.size());
    bool res = socket.waitForBytesWritten(timeout);
    res &= socket.waitForReadyRead(timeout); // wait for ack
    res &= (socket.read(qstrlen(ack)) == ack);
    if (block) // block until peer disconnects
        socket.waitForDisconnected(-1);
    return res;
}

void QtLocalPeer::receiveConnection()
{
    QLocalSocket* socket = server->nextPendingConnection();
    if (!socket)
        return;

    // Why doesn't Qt have a blocking stream that takes care of this shait???
    while (socket->bytesAvailable() < static_cast<int>(sizeof(quint32))) {
        if (!socket->isValid()) // stale request
            return;
        socket->waitForReadyRead(1000);
    }
    QDataStream ds(socket);
    QByteArray uMsg;
    quint32 remaining;
    ds >> remaining;
    uMsg.resize(remaining);
    int got = 0;
    char* uMsgBuf = uMsg.data();
    //qDebug() << "RCV: remaining" << remaining;
    do {
        got = ds.readRawData(uMsgBuf, remaining);
        remaining -= got;
        uMsgBuf += got;
        //qDebug() << "RCV: got" << got << "remaining" << remaining;
    } while (remaining && got >= 0 && socket->waitForReadyRead(2000));
    //### error check: got<0
    if (got < 0) {
        qWarning() << "QtLocalPeer: Message reception failed" << socket->errorString();
        delete socket;
        return;
    }
    // ### async this
    QString message = QString::fromUtf8(uMsg.constData(), uMsg.size());
    socket->write(ack, qstrlen(ack));
    socket->waitForBytesWritten(1000);
    emit messageReceived(message, socket); // ##(might take a long time to return)
}

} // namespace SharedTools