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[kdenetwork.git] / kopete / libkopete / kopetepluginmanager.cpp

/*
    kopetepluginmanager.cpp - Kopete Plugin Loader

    Copyright (c) 2002-2003 by Duncan Mac-Vicar Prett <duncan@kde.org>
    Copyright (c) 2002-2003 by Martijn Klingens       <klingens@kde.org>
    Copyright (c) 2002-2004 by Olivier Goffart  <ogoffart @tiscalinet.be>

    Kopete    (c) 2002-2003 by the Kopete developers  <kopete-devel@kde.org>

    *************************************************************************
    *                                                                       *
    * This library is free software; you can redistribute it and/or         *
    * modify it under the terms of the GNU Lesser General Public            *
    * License as published by the Free Software Foundation; either          *
    * version 2 of the License, or (at your option) any later version.      *
    *                                                                       *
    *************************************************************************
*/

#include "config-kopete.h"

#include "kopetepluginmanager.h"

#if defined(HAVE_VALGRIND_H) && !defined(NDEBUG) && defined(__i386__)
// We don't want the per-skin includes, so pretend we have a skin header already
#define __VALGRIND_SOMESKIN_H
#include <valgrind/valgrind.h>
#endif

#include <QApplication>
#include <QFile>
#include <QRegExp>
#include <QTimer>
#include <QStack>

#include <ksharedconfig.h>
#include <kdebug.h>
#include <kparts/componentfactory.h>
#include <kplugininfo.h>
#include <kconfig.h>
#include <kstandarddirs.h>
#include <kurl.h>
#include <kservicetypetrader.h>

#include "kopeteplugin.h"
#include "kopetecontactlist.h"
#include "kopeteaccountmanager.h"

namespace Kopete
{

class PluginManagerPrivate
{
public:
        PluginManagerPrivate() : shutdownMode( StartingUp ), isAllPluginsLoaded(false)
        {
                plugins = KPluginInfo::fromServices( KServiceTypeTrader::self()->query( QLatin1String( "Kopete/Plugin" ), QLatin1String( "[X-Kopete-Version] == 1000900" ) ) );
        }

        ~PluginManagerPrivate()
        {
                if ( shutdownMode != DoneShutdown )
                        kWarning( 14010 ) << "Destructing plugin manager without going through the shutdown process! Backtrace is: " << endl << kBacktrace();

                // Clean up loadedPlugins manually, because PluginManager can't access our global
                // static once this destructor has started.
                while ( !loadedPlugins.empty() )
                {
                        InfoToPluginMap::ConstIterator it = loadedPlugins.constBegin();
                        kWarning( 14010 ) << "Deleting stale plugin '" << it.value()->objectName() << "'";
                        KPluginInfo info = it.key();
                        Plugin *plugin = it.value();
                        loadedPlugins.remove(info);
                        plugin->disconnect(&instance, SLOT(slotPluginDestroyed(QObject*)));
                        delete plugin;
                }
        }

        // All available plugins, regardless of category, and loaded or not
        QList<KPluginInfo> plugins;

        // Dict of all currently loaded plugins, mapping the KPluginInfo to
        // a plugin
        typedef QMap<KPluginInfo, Plugin *> InfoToPluginMap;
        InfoToPluginMap loadedPlugins;

        // The plugin manager's mode. The mode is StartingUp until loadAllPlugins()
        // has finished loading the plugins, after which it is set to Running.
        // ShuttingDown and DoneShutdown are used during Kopete shutdown by the
        // async unloading of plugins.
        enum ShutdownMode { StartingUp, Running, ShuttingDown, DoneShutdown };
        ShutdownMode shutdownMode;

        // Plugins pending for loading
        QStack<QString> pluginsToLoad;

        bool isAllPluginsLoaded;
        PluginManager instance;
};

K_GLOBAL_STATIC(PluginManagerPrivate, _kpmp)

PluginManager* PluginManager::self()
{
        return &_kpmp->instance;
}

PluginManager::PluginManager() : QObject( 0 )
{
        // We want to add a reference to the application's event loop so we
        // can remain in control when all windows are removed.
        // This way we can unload plugins asynchronously, which is more
        // robust if they are still doing processing.
        KGlobal::ref();
}

PluginManager::~PluginManager()
{
}

QList<KPluginInfo> PluginManager::availablePlugins( const QString &category ) const
{
        if ( category.isEmpty() )
                return _kpmp->plugins;

        QList<KPluginInfo> result;
        QList<KPluginInfo>::ConstIterator it;
        for ( it = _kpmp->plugins.constBegin(); it != _kpmp->plugins.constEnd(); ++it )
        {
                if ( it->category() == category && !(*it).service()->noDisplay() )
                        result.append( *it );
        }

        return result;
}

PluginList PluginManager::loadedPlugins( const QString &category ) const
{
        PluginList result;

        for ( PluginManagerPrivate::InfoToPluginMap::ConstIterator it = _kpmp->loadedPlugins.constBegin();
              it != _kpmp->loadedPlugins.constEnd(); ++it )
        {
                if ( category.isEmpty() || it.key().category() == category )
                        result.append( it.value() );
        }

        return result;
}


KPluginInfo PluginManager::pluginInfo( const Plugin *plugin ) const
{
        for ( PluginManagerPrivate::InfoToPluginMap::ConstIterator it = _kpmp->loadedPlugins.constBegin();
              it != _kpmp->loadedPlugins.constEnd(); ++it )
        {
                if ( it.value() == plugin )
                        return it.key();
        }
        return KPluginInfo();
}

void PluginManager::shutdown()
{
        if(_kpmp->shutdownMode != PluginManagerPrivate::Running)
        {
                kDebug( 14010 ) << "called when not running.  / state = " << _kpmp->shutdownMode;
                return;
        }

        _kpmp->shutdownMode = PluginManagerPrivate::ShuttingDown;


        /* save the contact list now, just in case a change was made very recently
           and it hasn't autosaved yet
           from a OO point of view, theses lines should not be there, but i don't
           see better place -Olivier
        */
        Kopete::ContactList::self()->save();
        Kopete::AccountManager::self()->save();

        // Remove any pending plugins to load, we're shutting down now :)
        _kpmp->pluginsToLoad.clear();

        // Ask all plugins to unload
        for ( PluginManagerPrivate::InfoToPluginMap::ConstIterator it = _kpmp->loadedPlugins.constBegin();
              it != _kpmp->loadedPlugins.constEnd(); /* EMPTY */ )
        {
                // Plugins could emit their ready for unload signal directly in response to this,
                // which would invalidate the current iterator. Therefore, we copy the iterator
                // and increment it beforehand.
                PluginManagerPrivate::InfoToPluginMap::ConstIterator current( it );
                ++it;
                // FIXME: a much cleaner approach would be to just delete the plugin now. if it needs
                //  to do some async processing, it can grab a reference to the app itself and create
                //  another object to do it.
                current.value()->aboutToUnload();
        }

        // When running under valgrind, don't enable the timer because it will almost
        // certainly fire due to valgrind's much slower processing
#if defined(HAVE_VALGRIND_H) && !defined(NDEBUG) && defined(__i386__)
        if ( RUNNING_ON_VALGRIND )
                kDebug(14010) << "Running under valgrind, disabling plugin unload timeout guard";
        else
#endif
                QTimer::singleShot( 3000, this, SLOT( slotShutdownTimeout() ) );
}

void PluginManager::slotPluginReadyForUnload()
{
        // Using QObject::sender() is on purpose here, because otherwise all
        // plugins would have to pass 'this' as parameter, which makes the API
        // less clean for plugin authors
        // FIXME: I don't buy the above argument. Add a Kopete::Plugin::emitReadyForUnload(void),
        //        and make readyForUnload be passed a plugin. - Richard
        Plugin *plugin = dynamic_cast<Plugin *>( const_cast<QObject *>( sender() ) );
        if ( !plugin )
        {
                kWarning( 14010 ) << "Calling object is not a plugin!";
                return;
        }
        kDebug( 14010 ) << plugin->pluginId() << "ready for unload";

        plugin->deleteLater();
}


void PluginManager::slotShutdownTimeout()
{
        // When we were already done the timer might still fire.
        // Do nothing in that case.
        if ( _kpmp->shutdownMode == PluginManagerPrivate::DoneShutdown )
                return;

        QStringList remaining;
        for ( PluginManagerPrivate::InfoToPluginMap::ConstIterator it = _kpmp->loadedPlugins.constBegin(); it != _kpmp->loadedPlugins.constEnd(); ++it )
                remaining.append( it.value()->pluginId() );

        kWarning( 14010 ) << "Some plugins didn't shutdown in time!" << endl
                << "Remaining plugins: " << remaining.join( QLatin1String( ", " ) ) << endl
                << "Forcing Kopete shutdown now." << endl;

        slotShutdownDone();
}

void PluginManager::slotShutdownDone()
{
        kDebug( 14010 ) ;

        _kpmp->shutdownMode = PluginManagerPrivate::DoneShutdown;

        KGlobal::deref();
}

void PluginManager::loadAllPlugins()
{
        // FIXME: We need session management here - Martijn

        KSharedConfig::Ptr config = KGlobal::config();
        if ( config->hasGroup( QLatin1String( "Plugins" ) ) )
        {
                QMap<QString, bool> pluginsMap;

                QMap<QString, QString> entries = config->entryMap( QLatin1String( "Plugins" ) );
                QMap<QString, QString>::Iterator it;
                for ( it = entries.begin(); it != entries.end(); ++it )
                {
                        QString key = it.key();
                        if ( key.endsWith( QLatin1String( "Enabled" ) ) )
                                pluginsMap.insert( key.left(key.length() - 7), (it.value() == QLatin1String( "true" )) );
                }

                QList<KPluginInfo> plugins = availablePlugins( QString::null ); //krazy:exclude=nullstrassign for old broken gcc
                QList<KPluginInfo>::ConstIterator it2 = plugins.constBegin();
                QList<KPluginInfo>::ConstIterator end = plugins.constEnd();
                for ( ; it2 != end; ++it2 )
                {
                        // Protocols are loaded automatically so they aren't always in Plugins group. (fixes bug 167113)
                        if ( it2->category() == QLatin1String( "Protocols" ) )
                                continue;

                        QString pluginName = it2->pluginName();
                        if ( pluginsMap.value( pluginName, it2->isPluginEnabledByDefault() ) )
                        {
                                if ( !plugin( pluginName ) )
                                        _kpmp->pluginsToLoad.push( pluginName );
                        }
                        else
                        {
                                //This happens if the user unloaded plugins with the config plugin page.
                                // No real need to be assync because the user usually unload few plugins
                                // compared tto the number of plugin to load in a cold start. - Olivier
                                if ( plugin( pluginName ) )
                                        unloadPlugin( pluginName );
                        }
                }
        }
        else
        {
                // we had no config, so we load any plugins that should be loaded by default.
                QList<KPluginInfo> plugins = availablePlugins( QString::null ); //krazy:exclude=nullstrassign for old broken gcc
                QList<KPluginInfo>::ConstIterator it = plugins.constBegin();
                QList<KPluginInfo>::ConstIterator end = plugins.constEnd();
                for ( ; it != end; ++it )
                {
                        if ( it->isPluginEnabledByDefault() )
                                _kpmp->pluginsToLoad.push( it->pluginName() );
                }
        }
        // Schedule the plugins to load
        QTimer::singleShot( 0, this, SLOT( slotLoadNextPlugin() ) );
}

void PluginManager::slotLoadNextPlugin()
{
        if ( _kpmp->pluginsToLoad.isEmpty() )
        {
                if ( _kpmp->shutdownMode == PluginManagerPrivate::StartingUp )
                {
                        _kpmp->shutdownMode = PluginManagerPrivate::Running;
                        _kpmp->isAllPluginsLoaded = true;
                        emit allPluginsLoaded();
                }
                return;
        }

        QString key = _kpmp->pluginsToLoad.pop();
        loadPluginInternal( key );

        // Schedule the next run unconditionally to avoid code duplication on the
        // allPluginsLoaded() signal's handling. This has the added benefit that
        // the signal is delayed one event loop, so the accounts are more likely
        // to be instantiated.
        QTimer::singleShot( 0, this, SLOT( slotLoadNextPlugin() ) );
}

Plugin * PluginManager::loadPlugin( const QString &_pluginId, PluginLoadMode mode /* = LoadSync */ )
{
        QString pluginId = _pluginId;

        // Try to find legacy code
        // FIXME: Find any cases causing this, remove them, and remove this too - Richard
        if ( pluginId.endsWith( QLatin1String( ".desktop" ) ) )
        {
                kWarning( 14010 ) << "Trying to use old-style API!" << endl << kBacktrace();
                pluginId = pluginId.remove( QRegExp( QLatin1String( ".desktop$" ) ) );
        }

        if ( mode == LoadSync )
        {
                return loadPluginInternal( pluginId );
        }
        else
        {
                _kpmp->pluginsToLoad.push( pluginId );
                QTimer::singleShot( 0, this, SLOT( slotLoadNextPlugin() ) );
                return 0L;
        }
}

Plugin *PluginManager::loadPluginInternal( const QString &pluginId )
{
        //kDebug( 14010 ) << pluginId;

        KPluginInfo info = infoForPluginId( pluginId );
        if ( !info.isValid() )
        {
                kWarning( 14010 ) << "Unable to find a plugin named '" << pluginId << "'!";
                return 0L;
        }

        if ( _kpmp->loadedPlugins.contains( info ) )
                return _kpmp->loadedPlugins[ info ];

        QString error;
        Plugin *plugin = KServiceTypeTrader::createInstanceFromQuery<Plugin>( QString::fromLatin1( "Kopete/Plugin" ), QString::fromLatin1( "[X-KDE-PluginInfo-Name]=='%1'" ).arg( pluginId ), this, QVariantList(), &error );

        if ( plugin )
        {
                _kpmp->loadedPlugins.insert( info, plugin );
                info.setPluginEnabled( true );

                connect( plugin, SIGNAL( destroyed( QObject * ) ), this, SLOT( slotPluginDestroyed( QObject * ) ) );
                connect( plugin, SIGNAL( readyForUnload() ), this, SLOT( slotPluginReadyForUnload() ) );

                kDebug( 14010 ) << "Successfully loaded plugin '" << pluginId << "'";

                emit pluginLoaded( plugin );
        }
        else
        {
                kDebug( 14010 ) << "Loading plugin " << pluginId << " failed, KServiceTypeTrader reported error: " << error ;
        }

        return plugin;
}

bool PluginManager::unloadPlugin( const QString &spec )
{
        //kDebug(14010) << spec;
        if( Plugin *thePlugin = plugin( spec ) )
        {
                thePlugin->aboutToUnload();
                return true;
        }
        else
                return false;
}



void PluginManager::slotPluginDestroyed( QObject *plugin )
{
        for ( PluginManagerPrivate::InfoToPluginMap::Iterator it = _kpmp->loadedPlugins.begin();
              it != _kpmp->loadedPlugins.end(); ++it )
        {
                if ( it.value() == plugin )
                {
                        QString pluginName = it.key().pluginName();
                        _kpmp->loadedPlugins.erase( it );
                        emit pluginUnloaded( pluginName );
                        break;
                }
        }

        if ( _kpmp->shutdownMode == PluginManagerPrivate::ShuttingDown && _kpmp->loadedPlugins.isEmpty() )
        {
                // Use a timer to make sure any pending deleteLater() calls have
                // been handled first
                QTimer::singleShot( 0, this, SLOT( slotShutdownDone() ) );
        }
}




Plugin* PluginManager::plugin( const QString &_pluginId ) const
{
        // Hack for compatibility with Plugin::pluginId(), which returns
        // classname() instead of the internal name. Changing that is not easy
        // as it invalidates the config file, the contact list, and most likely
        // other code as well.
        // For now, just transform FooProtocol to kopete_foo.
        // FIXME: In the future we'll need to change this nevertheless to unify
        //        the handling - Martijn
        QString pluginId = _pluginId;
        if ( pluginId.endsWith( QLatin1String( "Protocol" ) ) )
                pluginId = QLatin1String( "kopete_" ) + _pluginId.toLower().remove( QString::fromLatin1( "protocol" ) );
        // End hack

        KPluginInfo info = infoForPluginId( pluginId );
        if ( !info.isValid() )
                return 0L;

        if ( _kpmp->loadedPlugins.contains( info ) )
                return _kpmp->loadedPlugins[ info ];
        else
                return 0L;
}

KPluginInfo PluginManager::infoForPluginId( const QString &pluginId ) const
{
        QList<KPluginInfo>::ConstIterator it;
        for ( it = _kpmp->plugins.constBegin(); it != _kpmp->plugins.constEnd(); ++it )
        {
                if ( it->pluginName() == pluginId )
                        return *it;
        }

        return KPluginInfo();
}


bool PluginManager::setPluginEnabled( const QString &_pluginId, bool enabled /* = true */ )
{
        QString pluginId = _pluginId;

        KConfigGroup config(KGlobal::config(), "Plugins");

        // FIXME: What is this for? This sort of thing is kconf_update's job - Richard
        if ( !pluginId.startsWith( QLatin1String( "kopete_" ) ) )
                pluginId.prepend( QLatin1String( "kopete_" ) );

        if ( !infoForPluginId( pluginId ).isValid() )
                return false;

        config.writeEntry( pluginId + QLatin1String( "Enabled" ), enabled );
        config.sync();

        return true;
}

bool PluginManager::isAllPluginsLoaded() const
{
        return _kpmp->isAllPluginsLoaded;
}

} //END namespace Kopete


#include "kopetepluginmanager.moc"