annotate plugin/PluginScan.cpp @ 1247:8f076d02569a piper

Make SVDEBUG always write to a log file -- formerly this was disabled in NDEBUG builds. I think there's little use to that, it just means that we keep adding more cerr debug output because we aren't getting the log we need. And SVDEBUG logging is not usually used in tight loops, I don't think the performance overhead is too serious.

Also update the About box.

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    Sonic Visualiser
    An audio file viewer and annotation editor.
    Centre for Digital Music, Queen Mary, University of London.
    
    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 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#include "PluginScan.h"

#include "base/Debug.h"
#include "base/Preferences.h"
#include "base/HelperExecPath.h"

#include "checker/knownplugins.h"

#include <QMutex>
#include <QCoreApplication>

using std::string;

class PluginScan::Logger : public PluginCandidates::LogCallback
{
protected:
    void log(std::string message) {
        SVDEBUG << "PluginScan: " << message;
    }
};

PluginScan *PluginScan::getInstance()
{
    static QMutex mutex;
    static PluginScan *m_instance = 0;
    mutex.lock();
    if (!m_instance) m_instance = new PluginScan();
    mutex.unlock();
    return m_instance;
}

PluginScan::PluginScan() : m_succeeded(false), m_logger(new Logger) {
}

PluginScan::~PluginScan() {
    QMutexLocker locker(&m_mutex);
    clear();
    delete m_logger;
}

void
PluginScan::scan()
{
    QMutexLocker locker(&m_mutex);

    bool inProcess = Preferences::getInstance()->getRunPluginsInProcess();

    HelperExecPath hep(inProcess ?
                       HelperExecPath::NativeArchitectureOnly :
                       HelperExecPath::AllInstalled);

    QString helperName("plugin-checker-helper");
    auto helpers = hep.getHelperExecutables(helperName);

    clear();

    for (auto p: helpers) {
        SVDEBUG << "NOTE: PluginScan: Found helper: " << p.executable << endl;
    }
    
    if (helpers.empty()) {
        SVDEBUG << "NOTE: No plugin checker helpers found in installation;"
             << " found none of the following:" << endl;
        for (auto d: hep.getHelperCandidatePaths(helperName)) {
            SVDEBUG << "NOTE: " << d << endl;
        }
    }

    for (auto p: helpers) {
        try {
            KnownPlugins *kp = new KnownPlugins
                (p.executable.toStdString(), m_logger);
            if (m_kp.find(p.tag) != m_kp.end()) {
                SVDEBUG << "WARNING: PluginScan::scan: Duplicate tag " << p.tag
                     << " for helpers" << endl;
                continue;
            }
            m_kp[p.tag] = kp;
            m_succeeded = true;
        } catch (const std::exception &e) {
            SVDEBUG << "ERROR: PluginScan::scan: " << e.what()
                 << " (with helper path = " << p.executable << ")" << endl;
        }
    }
}

bool
PluginScan::scanSucceeded() const
{
    QMutexLocker locker(&m_mutex);
    return m_succeeded;
}

void
PluginScan::clear()
{
    for (auto &p: m_kp) {
        delete p.second;
    }
    m_kp.clear();
    m_succeeded = false;
}

QList<PluginScan::Candidate>
PluginScan::getCandidateLibrariesFor(PluginType type) const
{
    QMutexLocker locker(&m_mutex);

    KnownPlugins::PluginType kpt;
    switch (type) {
    case VampPlugin: kpt = KnownPlugins::VampPlugin; break;
    case LADSPAPlugin: kpt = KnownPlugins::LADSPAPlugin; break;
    case DSSIPlugin: kpt = KnownPlugins::DSSIPlugin; break;
    default: throw std::logic_error("Inconsistency in plugin type enums");
    }
    
    QList<Candidate> candidates;

    for (auto rec: m_kp) {

        KnownPlugins *kp = rec.second;
        
        auto c = kp->getCandidateLibrariesFor(kpt);

        SVDEBUG << "PluginScan: helper \"" << kp->getHelperExecutableName()
                << "\" likes " << c.size() << " libraries of type "
                << kp->getTagFor(kpt) << endl;

        for (auto s: c) {
            candidates.push_back({ s.c_str(), rec.first });
        }

        if (type != VampPlugin) {
            // We are only interested in querying multiple helpers
            // when dealing with Vamp plugins, for which we can use
            // external servers and so in some cases can support
            // additional architectures. Other plugin formats are
            // loaded directly and so must match the host, which is
            // what the first helper is supposed to handle -- so
            // break after the first one if not querying Vamp
            break;
        }
    }

    return candidates;
}

QString
PluginScan::getStartupFailureReport() const
{
    QMutexLocker locker(&m_mutex);

    if (!m_succeeded) {
	return QObject::tr("<b>Failed to scan for plugins</b>"
			   "<p>Failed to scan for plugins at startup. Possibly "
                           "the plugin checker helper program was not correctly "
                           "installed alongside %1?</p>")
            .arg(QCoreApplication::applicationName());
    }
    if (m_kp.empty()) {
	return QObject::tr("<b>Did not scan for plugins</b>"
			   "<p>Apparently no scan for plugins was attempted "
			   "(internal error?)</p>");
    }

    QString report;
    for (auto kp: m_kp) {
        report += QString::fromStdString(kp.second->getFailureReport());
    }
    if (report == "") {
	return report;
    }

    return QObject::tr("<b>Failed to load plugins</b>"
		       "<p>Failed to load one or more plugin libraries:</p>")
	+ report
        + QObject::tr("<p>These plugins may be incompatible with the system, "
                      "and will be ignored during this run of %1.</p>")
        .arg(QCoreApplication::applicationName());
}