X-Git-Url: https://git.quassel-irc.org/?p=quassel.git;a=blobdiff_plain;f=src%2Fcommon%2Fsignalproxy.cpp;h=76fccb73eb7013865015f9a5b0d5d3b6e2f2468a;hp=c35ccb5ef38f7d89c281139ca81239350bb73531;hb=e2188dc438be6f3eb0d9cdf47d28821aefe9835e;hpb=dde01ef184386a7391a6763f5bff33a0aab7ecb2

diff --git a/src/common/signalproxy.cpp b/src/common/signalproxy.cpp
index c35ccb5e..89355383 100644
--- a/src/common/signalproxy.cpp
+++ b/src/common/signalproxy.cpp
@@ -1,11 +1,11 @@
 /***************************************************************************
- *   Copyright (C) 2005-07 by The Quassel IRC Development Team             *
+ *   Copyright (C) 2005-2018 by the Quassel Project                        *
  *   devel@quassel-irc.org                                                 *
  *                                                                         *
  *   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.                                   *
+ *   (at your option) version 3.                                           *
  *                                                                         *
  *   This program is distributed in the hope that it will be useful,       *
  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
@@ -15,97 +15,1037 @@
  *   You should have received a copy of the GNU General Public License     *
  *   along with this program; if not, write to the                         *
  *   Free Software Foundation, Inc.,                                       *
- *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.         *
  ***************************************************************************/
 
+#include <utility>
+
+#include <QCoreApplication>
+#include <QHostAddress>
+#include <QMetaMethod>
+#include <QMetaProperty>
+#include <QThread>
+
+#ifdef HAVE_SSL
+    #include <QSslSocket>
+#endif
+
 #include "signalproxy.h"
 
-SignalProxy::SignalProxy(ProxyType _type, QIODevice *dev, QObject *parent) : QObject(parent), type(_type) {
-  if(dev) {
-    if(type != Client) {
-      qWarning() << tr("Device given for ProxyType == Server, ignoring...").toAscii();
+#include "peer.h"
+#include "protocol.h"
+#include "syncableobject.h"
+#include "util.h"
+#include "types.h"
+
+using namespace Protocol;
+
+class RemovePeerEvent : public QEvent
+{
+public:
+    RemovePeerEvent(Peer *peer) : QEvent(QEvent::Type(SignalProxy::RemovePeerEvent)), peer(peer) {}
+    Peer *peer;
+};
+
+
+// ==================================================
+//  SignalRelay
+// ==================================================
+class SignalProxy::SignalRelay : public QObject
+{
+/* Q_OBJECT is not necessary or even allowed, because we implement
+   qt_metacall ourselves (and don't use any other features of the meta
+   object system)
+*/
+public:
+    SignalRelay(SignalProxy *parent) : QObject(parent), _proxy(parent) {}
+    inline SignalProxy *proxy() const { return _proxy; }
+
+    int qt_metacall(QMetaObject::Call _c, int _id, void **_a) override;
+
+    void attachSignal(QObject *sender, int signalId, const QByteArray &funcName);
+    void detachSignal(QObject *sender, int signalId = -1);
+
+private:
+    struct Signal {
+        QObject *sender{nullptr};
+        int signalId{-1};
+        QByteArray signature;
+        Signal(QObject *sender, int sigId, QByteArray signature) : sender(sender), signalId(sigId), signature(std::move(signature)) {}
+        Signal() = default;
+    };
+
+    SignalProxy *_proxy;
+    QHash<int, Signal> _slots;
+};
+
+
+void SignalProxy::SignalRelay::attachSignal(QObject *sender, int signalId, const QByteArray &funcName)
+{
+    // we ride without safetybelts here... all checking for valid method etc pp has to be done by the caller
+    // all connected methodIds are offset by the standard methodCount of QObject
+    int slotId;
+    for (int i = 0;; i++) {
+        if (!_slots.contains(i)) {
+            slotId = i;
+            break;
+        }
+    }
+
+    QByteArray fn;
+    if (!funcName.isEmpty()) {
+        fn = QMetaObject::normalizedSignature(funcName);
+    }
+    else {
+        fn = SIGNAL(fakeMethodSignature());
+        fn = fn.replace("fakeMethodSignature()", sender->metaObject()->method(signalId).methodSignature());
+    }
+
+    _slots[slotId] = Signal(sender, signalId, fn);
+
+    QMetaObject::connect(sender, signalId, this, QObject::staticMetaObject.methodCount() + slotId);
+}
+
+
+void SignalProxy::SignalRelay::detachSignal(QObject *sender, int signalId)
+{
+    QHash<int, Signal>::iterator slotIter = _slots.begin();
+    while (slotIter != _slots.end()) {
+        if (slotIter->sender == sender && (signalId == -1 || slotIter->signalId == signalId)) {
+            slotIter = _slots.erase(slotIter);
+            if (signalId != -1)
+                break;
+        }
+        else {
+            ++slotIter;
+        }
+    }
+}
+
+
+int SignalProxy::SignalRelay::qt_metacall(QMetaObject::Call _c, int _id, void **_a)
+{
+    _id = QObject::qt_metacall(_c, _id, _a);
+    if (_id < 0)
+        return _id;
+
+    if (_c == QMetaObject::InvokeMetaMethod) {
+        if (_slots.contains(_id)) {
+            QObject *caller = sender();
+
+            SignalProxy::ExtendedMetaObject *eMeta = proxy()->extendedMetaObject(caller->metaObject());
+            Q_ASSERT(eMeta);
+
+            const Signal &signal = _slots[_id];
+
+            QVariantList params;
+
+            const QList<int> &argTypes = eMeta->argTypes(signal.signalId);
+            for (int i = 0; i < argTypes.size(); i++) {
+                if (argTypes[i] == 0) {
+                    qWarning() << "SignalRelay::qt_metacall(): received invalid data for argument number" << i << "of signal" << QString("%1::%2").arg(caller->metaObject()->className()).arg(caller->metaObject()->method(signal.signalId).methodSignature().constData());
+                    qWarning() << "                            - make sure all your data types are known by the Qt MetaSystem";
+                    return _id;
+                }
+                params << QVariant(argTypes[i], _a[i+1]);
+            }
+
+            if (proxy()->_restrictMessageTarget) {
+                for (auto peer : proxy()->_restrictedTargets) {
+                    if (peer != nullptr)
+                        proxy()->dispatch(peer, RpcCall(signal.signature, params));
+                }
+            } else
+                proxy()->dispatch(RpcCall(signal.signature, params));
+        }
+        _id -= _slots.count();
+    }
+    return _id;
+}
+
+
+// ==================================================
+//  SignalProxy
+// ==================================================
+
+namespace {
+thread_local SignalProxy *_current{nullptr};
+}
+
+SignalProxy::SignalProxy(QObject *parent)
+    : QObject(parent)
+{
+    setProxyMode(Client);
+    init();
+}
+
+
+SignalProxy::SignalProxy(ProxyMode mode, QObject *parent)
+    : QObject(parent)
+{
+    setProxyMode(mode);
+    init();
+}
+
+
+SignalProxy::~SignalProxy()
+{
+    QHash<QByteArray, ObjectId>::iterator classIter = _syncSlave.begin();
+    while (classIter != _syncSlave.end()) {
+        ObjectId::iterator objIter = classIter->begin();
+        while (objIter != classIter->end()) {
+            SyncableObject *obj = objIter.value();
+            objIter = classIter->erase(objIter);
+            obj->stopSynchronize(this);
+        }
+        ++classIter;
+    }
+    _syncSlave.clear();
+
+    removeAllPeers();
+
+    _current = nullptr;
+}
+
+
+SignalProxy *SignalProxy::current()
+{
+    return _current;
+}
+
+
+void SignalProxy::setProxyMode(ProxyMode mode)
+{
+    if (!_peerMap.empty()) {
+        qWarning() << Q_FUNC_INFO << "Cannot change proxy mode while connected";
+        return;
+    }
+
+    _proxyMode = mode;
+    if (mode == Server)
+        initServer();
+    else
+        initClient();
+}
+
+void SignalProxy::init()
+{
+    _heartBeatInterval = 0;
+    _maxHeartBeatCount = 0;
+    _signalRelay = new SignalRelay(this);
+    setHeartBeatInterval(30);
+    setMaxHeartBeatCount(2);
+    _secure = false;
+    _current = this;
+    updateSecureState();
+}
+
+
+void SignalProxy::initServer()
+{
+}
+
+
+void SignalProxy::initClient()
+{
+    attachSlot("__objectRenamed__", this, SLOT(objectRenamed(QByteArray,QString,QString)));
+}
+
+
+void SignalProxy::setHeartBeatInterval(int secs)
+{
+    if (_heartBeatInterval != secs) {
+        _heartBeatInterval = secs;
+        emit heartBeatIntervalChanged(secs);
+    }
+}
+
+
+void SignalProxy::setMaxHeartBeatCount(int max)
+{
+    if (_maxHeartBeatCount != max) {
+        _maxHeartBeatCount = max;
+        emit maxHeartBeatCountChanged(max);
+    }
+}
+
+
+bool SignalProxy::addPeer(Peer *peer)
+{
+    if (!peer)
+        return false;
+
+    if (_peerMap.values().contains(peer))
+        return true;
+
+    if (!peer->isOpen()) {
+        qWarning("SignalProxy: peer needs to be open!");
+        return false;
+    }
+
+    if (proxyMode() == Client) {
+        if (!_peerMap.isEmpty()) {
+            qWarning("SignalProxy: only one peer allowed in client mode!");
+            return false;
+        }
+        connect(peer, SIGNAL(lagUpdated(int)), SIGNAL(lagUpdated(int)));
+    }
+
+    connect(peer, SIGNAL(disconnected()), SLOT(removePeerBySender()));
+    connect(peer, SIGNAL(secureStateChanged(bool)), SLOT(updateSecureState()));
+
+    if (!peer->parent())
+        peer->setParent(this);
+
+    if (peer->id() < 0) {
+        peer->setId(nextPeerId());
+        peer->setConnectedSince(QDateTime::currentDateTimeUtc());
+    }
+
+    _peerMap[peer->id()] = peer;
+
+    peer->setSignalProxy(this);
+
+    if (peerCount() == 1)
+        emit connected();
+
+    updateSecureState();
+    return true;
+}
+
+
+void SignalProxy::removeAllPeers()
+{
+    Q_ASSERT(proxyMode() == Server || peerCount() <= 1);
+    // wee need to copy that list since we modify it in the loop
+    QList<Peer *> peers = _peerMap.values();
+    for (auto peer : peers) {
+        removePeer(peer);
+    }
+}
+
+
+void SignalProxy::removePeer(Peer *peer)
+{
+    if (!peer) {
+        qWarning() << Q_FUNC_INFO << "Trying to remove a null peer!";
+        return;
+    }
+
+    if (_peerMap.isEmpty()) {
+        qWarning() << "SignalProxy::removePeer(): No peers in use!";
+        return;
+    }
+
+    if (!_peerMap.values().contains(peer)) {
+        qWarning() << "SignalProxy: unknown Peer" << peer;
+        return;
+    }
+
+    disconnect(peer, nullptr, this, nullptr);
+    peer->setSignalProxy(nullptr);
+
+    _peerMap.remove(peer->id());
+    emit peerRemoved(peer);
+
+    if (peer->parent() == this)
+        peer->deleteLater();
+
+    updateSecureState();
+
+    if (_peerMap.isEmpty())
+        emit disconnected();
+}
+
+
+void SignalProxy::removePeerBySender()
+{
+    removePeer(qobject_cast<Peer *>(sender()));
+}
+
+
+void SignalProxy::renameObject(const SyncableObject *obj, const QString &newname, const QString &oldname)
+{
+    if (proxyMode() == Client)
+        return;
+
+    const QMetaObject *meta = obj->syncMetaObject();
+    const QByteArray className(meta->className());
+    objectRenamed(className, newname, oldname);
+
+    dispatch(RpcCall("__objectRenamed__", QVariantList() << className << newname << oldname));
+}
+
+
+void SignalProxy::objectRenamed(const QByteArray &classname, const QString &newname, const QString &oldname)
+{
+    if (_syncSlave.contains(classname) && _syncSlave[classname].contains(oldname) && oldname != newname) {
+        SyncableObject *obj = _syncSlave[classname][newname] = _syncSlave[classname].take(oldname);
+        requestInit(obj);
+    }
+}
+
+
+const QMetaObject *SignalProxy::metaObject(const QObject *obj)
+{
+    if (const auto *syncObject = qobject_cast<const SyncableObject *>(obj))
+        return syncObject->syncMetaObject();
+    else
+        return obj->metaObject();
+}
+
+
+SignalProxy::ExtendedMetaObject *SignalProxy::extendedMetaObject(const QMetaObject *meta) const
+{
+    if (_extendedMetaObjects.contains(meta))
+        return _extendedMetaObjects[meta];
+    else
+        return nullptr;
+}
+
+
+SignalProxy::ExtendedMetaObject *SignalProxy::createExtendedMetaObject(const QMetaObject *meta, bool checkConflicts)
+{
+    if (!_extendedMetaObjects.contains(meta)) {
+        _extendedMetaObjects[meta] = new ExtendedMetaObject(meta, checkConflicts);
+    }
+    return _extendedMetaObjects[meta];
+}
+
+
+bool SignalProxy::attachSignal(QObject *sender, const char *signal, const QByteArray &sigName)
+{
+    const QMetaObject *meta = sender->metaObject();
+    QByteArray sig(meta->normalizedSignature(signal).mid(1));
+    int methodId = meta->indexOfMethod(sig.constData());
+    if (methodId == -1 || meta->method(methodId).methodType() != QMetaMethod::Signal) {
+        qWarning() << "SignalProxy::attachSignal(): No such signal" << signal;
+        return false;
+    }
+
+    createExtendedMetaObject(meta);
+    _signalRelay->attachSignal(sender, methodId, sigName);
+
+    disconnect(sender, SIGNAL(destroyed(QObject *)), this, SLOT(detachObject(QObject *)));
+    connect(sender, SIGNAL(destroyed(QObject *)), this, SLOT(detachObject(QObject *)));
+    return true;
+}
+
+
+bool SignalProxy::attachSlot(const QByteArray &sigName, QObject *recv, const char *slot)
+{
+    const QMetaObject *meta = recv->metaObject();
+    int methodId = meta->indexOfMethod(meta->normalizedSignature(slot).mid(1));
+    if (methodId == -1 || meta->method(methodId).methodType() == QMetaMethod::Method) {
+        qWarning() << "SignalProxy::attachSlot(): No such slot" << slot;
+        return false;
+    }
+
+    createExtendedMetaObject(meta);
+
+    QByteArray funcName = QMetaObject::normalizedSignature(sigName.constData());
+    _attachedSlots.insert(funcName, qMakePair(recv, methodId));
+
+    disconnect(recv, SIGNAL(destroyed(QObject *)), this, SLOT(detachObject(QObject *)));
+    connect(recv, SIGNAL(destroyed(QObject *)), this, SLOT(detachObject(QObject *)));
+    return true;
+}
+
+
+void SignalProxy::synchronize(SyncableObject *obj)
+{
+    createExtendedMetaObject(obj, true);
+
+    // attaching as slave to receive sync Calls
+    QByteArray className(obj->syncMetaObject()->className());
+    _syncSlave[className][obj->objectName()] = obj;
+
+    if (proxyMode() == Server) {
+        obj->setInitialized();
+        emit objectInitialized(obj);
+    }
+    else {
+        if (obj->isInitialized())
+            emit objectInitialized(obj);
+        else
+            requestInit(obj);
+    }
+
+    obj->synchronize(this);
+}
+
+
+void SignalProxy::detachObject(QObject *obj)
+{
+    // Don't try to connect SignalProxy from itself on shutdown
+    if (obj != this) {
+        detachSignals(obj);
+        detachSlots(obj);
+    }
+}
+
+
+void SignalProxy::detachSignals(QObject *sender)
+{
+    _signalRelay->detachSignal(sender);
+}
+
+
+void SignalProxy::detachSlots(QObject *receiver)
+{
+    SlotHash::iterator slotIter = _attachedSlots.begin();
+    while (slotIter != _attachedSlots.end()) {
+        if (slotIter.value().first == receiver) {
+            slotIter = _attachedSlots.erase(slotIter);
+        }
+        else
+            ++slotIter;
+    }
+}
+
+
+void SignalProxy::stopSynchronize(SyncableObject *obj)
+{
+    // we can't use a className here, since it might be effed up, if we receive the call as a result of a decon
+    // gladly the objectName() is still valid. So we have only to iterate over the classes not each instance! *sigh*
+    QHash<QByteArray, ObjectId>::iterator classIter = _syncSlave.begin();
+    while (classIter != _syncSlave.end()) {
+        if (classIter->contains(obj->objectName()) && classIter.value()[obj->objectName()] == obj) {
+            classIter->remove(obj->objectName());
+            break;
+        }
+        ++classIter;
+    }
+    obj->stopSynchronize(this);
+}
+
+
+template<class T>
+void SignalProxy::dispatch(const T &protoMessage)
+{
+    for (auto&& peer : _peerMap.values()) {
+        dispatch(peer, protoMessage);
+    }
+}
+
+
+template<class T>
+void SignalProxy::dispatch(Peer *peer, const T &protoMessage)
+{
+    _targetPeer = peer;
+
+    if (peer && peer->isOpen())
+        peer->dispatch(protoMessage);
+    else
+        QCoreApplication::postEvent(this, new ::RemovePeerEvent(peer));
+
+    _targetPeer = nullptr;
+}
+
+
+void SignalProxy::handle(Peer *peer, const SyncMessage &syncMessage)
+{
+    if (!_syncSlave.contains(syncMessage.className) || !_syncSlave[syncMessage.className].contains(syncMessage.objectName)) {
+        qWarning() << QString("no registered receiver for sync call: %1::%2 (objectName=\"%3\"). Params are:").arg(syncMessage.className, syncMessage.slotName, syncMessage.objectName)
+                   << syncMessage.params;
+        return;
+    }
+
+    SyncableObject *receiver = _syncSlave[syncMessage.className][syncMessage.objectName];
+    ExtendedMetaObject *eMeta = extendedMetaObject(receiver);
+    if (!eMeta->slotMap().contains(syncMessage.slotName)) {
+        qWarning() << QString("no matching slot for sync call: %1::%2 (objectName=\"%3\"). Params are:").arg(syncMessage.className, syncMessage.slotName, syncMessage.objectName)
+                   << syncMessage.params;
+        return;
+    }
+
+    int slotId = eMeta->slotMap()[syncMessage.slotName];
+    if (proxyMode() != eMeta->receiverMode(slotId)) {
+        qWarning("SignalProxy::handleSync(): invokeMethod for \"%s\" failed. Wrong ProxyMode!", eMeta->methodName(slotId).constData());
+        return;
+    }
+
+    // We can no longer construct a QVariant from QMetaType::Void
+    QVariant returnValue;
+    int returnType = eMeta->returnType(slotId);
+    if (returnType != QMetaType::Void)
+        returnValue = QVariant(static_cast<QVariant::Type>(returnType));
+
+    if (!invokeSlot(receiver, slotId, syncMessage.params, returnValue, peer)) {
+        qWarning("SignalProxy::handleSync(): invokeMethod for \"%s\" failed ", eMeta->methodName(slotId).constData());
+        return;
+    }
+
+    if (returnValue.type() != QVariant::Invalid && eMeta->receiveMap().contains(slotId)) {
+        int receiverId = eMeta->receiveMap()[slotId];
+        QVariantList returnParams;
+        if (eMeta->argTypes(receiverId).count() > 1)
+            returnParams << syncMessage.params;
+        returnParams << returnValue;
+        _targetPeer = peer;
+        peer->dispatch(SyncMessage(syncMessage.className, syncMessage.objectName, eMeta->methodName(receiverId), returnParams));
+        _targetPeer = nullptr;
+    }
+
+    // send emit update signal
+    invokeSlot(receiver, eMeta->updatedRemotelyId());
+}
+
+
+void SignalProxy::handle(Peer *peer, const InitRequest &initRequest)
+{
+   if (!_syncSlave.contains(initRequest.className)) {
+        qWarning() << "SignalProxy::handleInitRequest() received initRequest for unregistered Class:"
+                   << initRequest.className;
+        return;
+    }
+
+    if (!_syncSlave[initRequest.className].contains(initRequest.objectName)) {
+        qWarning() << "SignalProxy::handleInitRequest() received initRequest for unregistered Object:"
+                   << initRequest.className << initRequest.objectName;
+        return;
+    }
+
+    SyncableObject *obj = _syncSlave[initRequest.className][initRequest.objectName];
+    _targetPeer = peer;
+    peer->dispatch(InitData(initRequest.className, initRequest.objectName, initData(obj)));
+    _targetPeer = nullptr;
+}
+
+
+void SignalProxy::handle(Peer *peer, const InitData &initData)
+{
+    Q_UNUSED(peer)
+
+    if (!_syncSlave.contains(initData.className)) {
+        qWarning() << "SignalProxy::handleInitData() received initData for unregistered Class:"
+                   << initData.className;
+        return;
+    }
+
+    if (!_syncSlave[initData.className].contains(initData.objectName)) {
+        qWarning() << "SignalProxy::handleInitData() received initData for unregistered Object:"
+                   << initData.className << initData.objectName;
+        return;
+    }
+
+    SyncableObject *obj = _syncSlave[initData.className][initData.objectName];
+    setInitData(obj, initData.initData);
+}
+
+
+void SignalProxy::handle(Peer *peer, const RpcCall &rpcCall)
+{
+    QObject *receiver;
+    int methodId;
+    SlotHash::const_iterator slot = _attachedSlots.constFind(rpcCall.slotName);
+    while (slot != _attachedSlots.constEnd() && slot.key() == rpcCall.slotName) {
+        receiver = (*slot).first;
+        methodId = (*slot).second;
+        if (!invokeSlot(receiver, methodId, rpcCall.params, peer)) {
+            ExtendedMetaObject *eMeta = extendedMetaObject(receiver);
+            qWarning("SignalProxy::handleSignal(): invokeMethod for \"%s\" failed ", eMeta->methodName(methodId).constData());
+        }
+        ++slot;
+    }
+}
+
+
+bool SignalProxy::invokeSlot(QObject *receiver, int methodId, const QVariantList &params, QVariant &returnValue, Peer *peer)
+{
+    ExtendedMetaObject *eMeta = extendedMetaObject(receiver);
+    const QList<int> args = eMeta->argTypes(methodId);
+    const int numArgs = params.count() < args.count()
+                        ? params.count()
+                        : args.count();
+
+    if (eMeta->minArgCount(methodId) > params.count()) {
+        qWarning() << "SignalProxy::invokeSlot(): not enough params to invoke" << eMeta->methodName(methodId);
+        return false;
+    }
+
+    void *_a[] = { nullptr,           // return type...
+                   nullptr, nullptr, nullptr, nullptr, nullptr, // and 10 args - that's the max size qt can handle with signals and slots
+                   nullptr, nullptr, nullptr, nullptr, nullptr };
+
+    // check for argument compatibility and build params array
+    for (int i = 0; i < numArgs; i++) {
+        if (!params[i].isValid()) {
+            qWarning() << "SignalProxy::invokeSlot(): received invalid data for argument number" << i << "of method" << QString("%1::%2()").arg(receiver->metaObject()->className()).arg(receiver->metaObject()->method(methodId).methodSignature().constData());
+            qWarning() << "                            - make sure all your data types are known by the Qt MetaSystem";
+            return false;
+        }
+        if (args[i] != QMetaType::type(params[i].typeName())) {
+            qWarning() << "SignalProxy::invokeSlot(): incompatible param types to invoke" << eMeta->methodName(methodId);
+            return false;
+        }
+
+        _a[i+1] = const_cast<void *>(params[i].constData());
+    }
+
+    if (returnValue.type() != QVariant::Invalid)
+        _a[0] = const_cast<void *>(returnValue.constData());
+
+    Qt::ConnectionType type = QThread::currentThread() == receiver->thread()
+                              ? Qt::DirectConnection
+                              : Qt::QueuedConnection;
+
+    if (type == Qt::DirectConnection) {
+        _sourcePeer = peer;
+        auto result = receiver->qt_metacall(QMetaObject::InvokeMetaMethod, methodId, _a) < 0;
+        _sourcePeer = nullptr;
+        return result;
     } else {
-      addPeer(dev);
+        qWarning() << "Queued Connections are not implemented yet";
+        // note to self: qmetaobject.cpp:990 ff
+        return false;
+    }
+}
+
+
+bool SignalProxy::invokeSlot(QObject *receiver, int methodId, const QVariantList &params, Peer *peer)
+{
+    QVariant ret;
+    return invokeSlot(receiver, methodId, params, ret, peer);
+}
+
+
+void SignalProxy::requestInit(SyncableObject *obj)
+{
+    if (proxyMode() == Server || obj->isInitialized())
+        return;
+
+    dispatch(InitRequest(obj->syncMetaObject()->className(), obj->objectName()));
+}
+
+
+QVariantMap SignalProxy::initData(SyncableObject *obj) const
+{
+    return obj->toVariantMap();
+}
+
+
+void SignalProxy::setInitData(SyncableObject *obj, const QVariantMap &properties)
+{
+    if (obj->isInitialized())
+        return;
+    obj->fromVariantMap(properties);
+    obj->setInitialized();
+    emit objectInitialized(obj);
+    invokeSlot(obj, extendedMetaObject(obj)->updatedRemotelyId());
+}
+
+
+void SignalProxy::customEvent(QEvent *event)
+{
+    switch ((int)event->type()) {
+    case RemovePeerEvent: {
+        auto *e = static_cast< ::RemovePeerEvent *>(event);
+        removePeer(e->peer);
+        event->accept();
+        break;
+    }
+
+    default:
+        qWarning() << Q_FUNC_INFO << "Received unknown custom event:" << event->type();
+        return;
+    }
+}
+
+
+void SignalProxy::sync_call__(const SyncableObject *obj, SignalProxy::ProxyMode modeType, const char *funcname, va_list ap)
+{
+    // qDebug() << obj << modeType << "(" << _proxyMode << ")" << funcname;
+    if (modeType != _proxyMode)
+        return;
+
+    ExtendedMetaObject *eMeta = extendedMetaObject(obj);
+
+    QVariantList params;
+
+    const QList<int> &argTypes = eMeta->argTypes(eMeta->methodId(QByteArray(funcname)));
+
+    for (int i = 0; i < argTypes.size(); i++) {
+        if (argTypes[i] == 0) {
+            qWarning() << Q_FUNC_INFO << "received invalid data for argument number" << i << "of signal" << QString("%1::%2").arg(eMeta->metaObject()->className()).arg(funcname);
+            qWarning() << "        - make sure all your data types are known by the Qt MetaSystem";
+            return;
+        }
+        params << QVariant(argTypes[i], va_arg(ap, void *));
+    }
+
+    if (_restrictMessageTarget) {
+        for (auto peer : _restrictedTargets) {
+            if (peer != nullptr)
+                dispatch(peer, SyncMessage(eMeta->metaObject()->className(), obj->objectName(), QByteArray(funcname), params));
+        }
+    } else
+        dispatch(SyncMessage(eMeta->metaObject()->className(), obj->objectName(), QByteArray(funcname), params));
+}
+
+
+void SignalProxy::disconnectDevice(QIODevice *dev, const QString &reason)
+{
+    if (!reason.isEmpty())
+        qWarning() << qPrintable(reason);
+    auto *sock  = qobject_cast<QAbstractSocket *>(dev);
+    if (sock)
+        qWarning() << qPrintable(tr("Disconnecting")) << qPrintable(sock->peerAddress().toString());
+    dev->close();
+}
+
+
+void SignalProxy::dumpProxyStats()
+{
+    QString mode;
+    if (proxyMode() == Server)
+        mode = "Server";
+    else
+        mode = "Client";
+
+    int slaveCount = 0;
+    foreach(ObjectId oid, _syncSlave.values())
+    slaveCount += oid.count();
+
+    qDebug() << this;
+    qDebug() << "              Proxy Mode:" << mode;
+    qDebug() << "          attached Slots:" << _attachedSlots.count();
+    qDebug() << " number of synced Slaves:" << slaveCount;
+    qDebug() << "number of Classes cached:" << _extendedMetaObjects.count();
+}
+
+
+void SignalProxy::updateSecureState()
+{
+    bool wasSecure = _secure;
+
+    _secure = !_peerMap.isEmpty();
+    for (auto peer :  _peerMap.values()) {
+        _secure &= peer->isSecure();
+    }
+
+    if (wasSecure != _secure)
+        emit secureStateChanged(_secure);
+}
+
+QVariantList SignalProxy::peerData() {
+    QVariantList result;
+    for (auto &&peer : _peerMap.values()) {
+        QVariantMap data;
+        data["id"] = peer->id();
+        data["clientVersion"] = peer->clientVersion();
+        // We explicitly rename this, as, due to the Debian reproducability changes, buildDate isn’t actually the build
+        // date anymore, but on newer clients the date of the last git commit
+        data["clientVersionDate"] = peer->buildDate();
+        data["remoteAddress"] = peer->address();
+        data["connectedSince"] = peer->connectedSince();
+        data["secure"] = peer->isSecure();
+        data["features"] = static_cast<quint32>(peer->features().toLegacyFeatures());
+        data["featureList"] = peer->features().toStringList();
+        result << data;
     }
-  }
+    return result;
+}
+
+Peer *SignalProxy::peerById(int peerId) {
+    // We use ::value() here instead of the [] operator because the latter has the side-effect
+    // of automatically inserting a null value with the passed key into the map.  See
+    // https://doc.qt.io/qt-5/qhash.html#operator-5b-5d and https://doc.qt.io/qt-5/qhash.html#value.
+    return _peerMap.value(peerId);
+}
+
+void SignalProxy::restrictTargetPeers(QSet<Peer*> peers, std::function<void()> closure)
+{
+    auto previousRestrictMessageTarget = _restrictMessageTarget;
+    auto previousRestrictedTargets = _restrictedTargets;
+    _restrictMessageTarget = true;
+    _restrictedTargets = peers;
+
+    closure();
+
+    _restrictMessageTarget = previousRestrictMessageTarget;
+    _restrictedTargets = previousRestrictedTargets;
 }
 
-SignalProxy::~SignalProxy() {
-  foreach(Connection conn, peers) {
-    conn.peer->deleteLater(); conn.device->deleteLater();
-  }
+Peer *SignalProxy::sourcePeer() {
+    return _sourcePeer;
 }
 
-void SignalProxy::addPeer(QIODevice *dev) {
-  if(type == Client && peers.count()) {
-    qWarning() << tr("Cannot add more than one peer to a SignalProxy in client mode!").toAscii();
-    return;
-  }
-  Connection conn;
-  conn.device = dev;
-  conn.peer = new QxtRPCPeer(dev, QxtRPCPeer::Peer, this);
-  connect(conn.peer, SIGNAL(peerDisconnected()), this, SLOT(socketDisconnected()));
+void SignalProxy::setSourcePeer(Peer *sourcePeer) {
+    _sourcePeer = sourcePeer;
+}
 
-  foreach(SlotDesc slot, attachedSlots) {
-    conn.peer->attachSlot(slot.rpcFunction, slot.recv, slot.slot);
-  }
-  foreach(SignalDesc sig, attachedSignals) {
-    conn.peer->attachSignal(sig.sender, sig.signal, sig.rpcFunction);
-  }
-  peers.append(conn);
+Peer *SignalProxy::targetPeer() {
+    return _targetPeer;
+}
 
+void SignalProxy::setTargetPeer(Peer *targetPeer) {
+    _targetPeer = targetPeer;
 }
 
-void SignalProxy::socketDisconnected() {
-  for(int i = 0; i < peers.count(); i++) {
-    Connection conn = peers[i];
-    QAbstractSocket *sock = qobject_cast<QAbstractSocket*>(conn.device);
-    if(!sock) continue;
-    if(sock->state() == QAbstractSocket::UnconnectedState) {
-      peers[i].peer->deleteLater(); peers[i].device->deleteLater();
-      peers.removeAt(i);
-      emit peerDisconnected();
-      i--;
+// ==================================================
+//  ExtendedMetaObject
+// ==================================================
+SignalProxy::ExtendedMetaObject::ExtendedMetaObject(const QMetaObject *meta, bool checkConflicts)
+    : _meta(meta),
+    _updatedRemotelyId(_meta->indexOfSignal("updatedRemotely()"))
+{
+    for (int i = 0; i < _meta->methodCount(); i++) {
+        if (_meta->method(i).methodType() != QMetaMethod::Slot)
+            continue;
+
+        if (_meta->method(i).methodSignature().contains('*'))
+            continue;  // skip methods with ptr params
+
+        QByteArray method = methodName(_meta->method(i));
+        if (method.startsWith("init"))
+            continue;  // skip initializers
+
+        if (_methodIds.contains(method)) {
+            /* funny... moc creates for methods containing default parameters multiple metaMethod with separate methodIds.
+               we don't care... we just need the full fledged version
+             */
+            const QMetaMethod &current = _meta->method(_methodIds[method]);
+            const QMetaMethod &candidate = _meta->method(i);
+            if (current.parameterTypes().count() > candidate.parameterTypes().count()) {
+                int minCount = candidate.parameterTypes().count();
+                QList<QByteArray> commonParams = current.parameterTypes().mid(0, minCount);
+                if (commonParams == candidate.parameterTypes())
+                    continue;  // we already got the full featured version
+            }
+            else {
+                int minCount = current.parameterTypes().count();
+                QList<QByteArray> commonParams = candidate.parameterTypes().mid(0, minCount);
+                if (commonParams == current.parameterTypes()) {
+                    _methodIds[method] = i; // use the new one
+                    continue;
+                }
+            }
+            if (checkConflicts) {
+                qWarning() << "class" << meta->className() << "contains overloaded methods which is currently not supported!";
+                qWarning() << " - " << _meta->method(i).methodSignature() << "conflicts with" << _meta->method(_methodIds[method]).methodSignature();
+            }
+            continue;
+        }
+        _methodIds[method] = i;
     }
-  }
 }
 
-void SignalProxy::attachSignal(QObject* sender, const char* signal, const QByteArray& rpcFunction) {
-  foreach(Connection conn, peers) {
-    conn.peer->attachSignal(sender, signal, rpcFunction);
-  }
-  attachedSignals.append(SignalDesc(sender, signal, rpcFunction));
 
+const SignalProxy::ExtendedMetaObject::MethodDescriptor &SignalProxy::ExtendedMetaObject::methodDescriptor(int methodId)
+{
+    if (!_methods.contains(methodId)) {
+        _methods[methodId] = MethodDescriptor(_meta->method(methodId));
+    }
+    return _methods[methodId];
 }
 
-void SignalProxy::attachSlot(const QByteArray& rpcFunction, QObject* recv, const char* slot) {
-  foreach(Connection conn, peers) {
-    conn.peer->attachSlot(rpcFunction, recv, slot);
-  }
-  attachedSlots.append(SlotDesc(rpcFunction, recv, slot));
+
+const QHash<int, int> &SignalProxy::ExtendedMetaObject::receiveMap()
+{
+    if (_receiveMap.isEmpty()) {
+        QHash<int, int> receiveMap;
+
+        QMetaMethod requestSlot;
+        QByteArray returnTypeName;
+        QByteArray signature;
+        QByteArray methodName;
+        QByteArray params;
+        int paramsPos;
+        int receiverId;
+        const int methodCount = _meta->methodCount();
+        for (int i = 0; i < methodCount; i++) {
+            requestSlot = _meta->method(i);
+            if (requestSlot.methodType() != QMetaMethod::Slot)
+                continue;
+
+            returnTypeName = requestSlot.typeName();
+            if (QMetaType::Void == (QMetaType::Type)returnType(i))
+                continue;
+
+            signature = requestSlot.methodSignature();
+            if (!signature.startsWith("request"))
+                continue;
+
+            paramsPos = signature.indexOf('(');
+            if (paramsPos == -1)
+                continue;
+
+            methodName = signature.left(paramsPos);
+            params = signature.mid(paramsPos);
+
+            methodName = methodName.replace("request", "receive");
+            params = params.left(params.count() - 1) + ", " + returnTypeName + ")";
+
+            signature = QMetaObject::normalizedSignature(methodName + params);
+            receiverId = _meta->indexOfSlot(signature);
+
+            if (receiverId == -1) {
+                signature = QMetaObject::normalizedSignature(methodName + "(" + returnTypeName + ")");
+                receiverId = _meta->indexOfSlot(signature);
+            }
+
+            if (receiverId != -1) {
+                receiveMap[i] = receiverId;
+            }
+        }
+        _receiveMap = receiveMap;
+    }
+    return _receiveMap;
 }
 
-void SignalProxy::detachObject(QObject* obj) {
-  //Q_ASSERT(false); // not done yet
-  foreach(Connection conn, peers) {
-    conn.peer->detachObject(obj);
-  }
-  QList<SignalDesc> sigs;
-  foreach(SignalDesc desc, attachedSignals) {
-    if(desc.sender != obj) sigs << desc;
-  }
-  attachedSignals = sigs;
-  QList<SlotDesc> slot;
-  foreach(SlotDesc desc, attachedSlots) {
-    if(desc.recv != obj) slot << desc;
-  }
-  attachedSlots = slot;
-  // FIXME: test this!
+
+QByteArray SignalProxy::ExtendedMetaObject::methodName(const QMetaMethod &method)
+{
+    QByteArray sig(method.methodSignature());
+    return sig.left(sig.indexOf("("));
 }
 
-void SignalProxy::sendSignal(const char *signal, QVariant p1, QVariant p2, QVariant p3, QVariant p4, QVariant p5, QVariant p6, QVariant p7, QVariant p8, QVariant p9) {
-  foreach(Connection conn, peers) {
-    conn.peer->call(signal, p1, p2, p3, p4, p5, p6, p7, p8, p9);
-  }
+
+QString SignalProxy::ExtendedMetaObject::methodBaseName(const QMetaMethod &method)
+{
+    QString methodname = QString(method.methodSignature()).section("(", 0, 0);
+
+    // determine where we have to chop:
+    int upperCharPos;
+    if (method.methodType() == QMetaMethod::Slot) {
+        // we take evertyhing from the first uppercase char if it's slot
+        upperCharPos = methodname.indexOf(QRegExp("[A-Z]"));
+        if (upperCharPos == -1)
+            return QString();
+        methodname = methodname.mid(upperCharPos);
+    }
+    else {
+        // and if it's a signal we discard everything from the last uppercase char
+        upperCharPos = methodname.lastIndexOf(QRegExp("[A-Z]"));
+        if (upperCharPos == -1)
+            return QString();
+        methodname = methodname.left(upperCharPos);
+    }
+
+    methodname[0] = methodname[0].toUpper();
+
+    return methodname;
 }
 
+
+SignalProxy::ExtendedMetaObject::MethodDescriptor::MethodDescriptor(const QMetaMethod &method)
+    : _methodName(SignalProxy::ExtendedMetaObject::methodName(method)),
+    _returnType(QMetaType::type(method.typeName()))
+{
+    // determine argTypes
+    QList<QByteArray> paramTypes = method.parameterTypes();
+    QList<int> argTypes;
+    for (int i = 0; i < paramTypes.count(); i++) {
+        argTypes.append(QMetaType::type(paramTypes[i]));
+    }
+    _argTypes = argTypes;
+
+    // determine minArgCount
+    QString signature(method.methodSignature());
+    _minArgCount = method.parameterTypes().count() - signature.count("=");
+
+    _receiverMode = (_methodName.startsWith("request"))
+                    ? SignalProxy::Server
+                    : SignalProxy::Client;
+}