NetworkPacket: Optimize serialization/deserialization

We don't need to convert the data to an intermediate QVariantMap just to
make JSON out of it. This siginificantly improves performance.
The measurements were done with 3000000 iterations each:

Before serialization: 0.0045009 msecs
Before deserialization: 0.002293 msecs

After serialization: 0.0034216 msecs (32% faster)
After deserialization: 0.001776 msecs (29% faster)
This commit is contained in:
Alexander Lohnau 2024-09-08 16:21:28 +02:00 committed by Albert Vaca Cintora
parent d0dff8aff4
commit 0b4d0757dc

View file

@ -43,26 +43,20 @@ NetworkPacket::NetworkPacket(const QString &type, const QVariantMap &body)
QByteArray NetworkPacket::serialize() const
{
// Object -> QVariant
QVariantMap variant;
variant.insert(QStringLiteral("id"), m_id);
variant.insert(QStringLiteral("type"), m_type);
variant.insert(QStringLiteral("body"), m_body);
QJsonObject obj;
obj.insert(QLatin1String("id"), m_id);
obj.insert(QLatin1String("type"), m_type);
obj.insert(QLatin1String("body"), QJsonObject::fromVariantMap(m_body));
if (hasPayload()) {
variant.insert(QStringLiteral("payloadSize"), m_payloadSize);
variant.insert(QStringLiteral("payloadTransferInfo"), m_payloadTransferInfo);
obj.insert(QLatin1String("payloadSize"), m_payloadSize);
obj.insert(QLatin1String("payloadTransferInfo"), QJsonObject::fromVariantMap(m_payloadTransferInfo));
}
// QVariant -> json
auto jsonDocument = QJsonDocument::fromVariant(variant);
QByteArray json = jsonDocument.toJson(QJsonDocument::Compact);
QByteArray json = QJsonDocument(obj).toJson(QJsonDocument::Compact);
if (json.isEmpty()) {
qCDebug(KDECONNECT_CORE) << "Serialization error:";
} else {
/*if (!isEncrypted()) {
//qCDebug(KDECONNECT_CORE) << "Serialized packet:" << json;
}*/
json.append('\n');
}
@ -70,9 +64,9 @@ QByteArray NetworkPacket::serialize() const
}
template<class T>
void qvariant2qobject(const QVariantMap &variant, T *object)
void qjsonobject2qobject(const QJsonObject &obj, T *object)
{
for (QVariantMap::const_iterator iter = variant.begin(); iter != variant.end(); ++iter) {
for (auto iter = obj.begin(); iter != obj.end(); ++iter) {
const int propertyIndex = T::staticMetaObject.indexOfProperty(iter.key().toLatin1().data());
if (propertyIndex < 0) {
qCWarning(KDECONNECT_CORE) << "missing property" << object << iter.key();
@ -80,7 +74,7 @@ void qvariant2qobject(const QVariantMap &variant, T *object)
}
QMetaProperty property = T::staticMetaObject.property(propertyIndex);
bool ret = property.writeOnGadget(object, *iter);
bool ret = property.writeOnGadget(object, iter.value().toVariant());
if (!ret) {
qCWarning(KDECONNECT_CORE) << "couldn't set" << object << "->" << property.name() << '=' << *iter;
}
@ -97,10 +91,12 @@ bool NetworkPacket::unserialize(const QByteArray &a, NetworkPacket *np)
return false;
}
auto variant = parser.toVariant().toMap();
qvariant2qobject(variant, np);
const QJsonObject obj = parser.object();
np->m_payloadTransferInfo = variant[QStringLiteral("payloadTransferInfo")].toMap(); // Will return an empty qvariantmap if was not present, which is ok
qjsonobject2qobject(obj, np);
// Will return an empty qvariantmap if was not present, which is ok
np->m_payloadTransferInfo = obj.value(QLatin1String("payloadTransferInfo")).toVariant().toMap();
// Ids containing characters that are not allowed as dbus paths would make app crash
if (np->m_body.contains(QStringLiteral("deviceId"))) {