File indexing completed on 2024-05-05 16:13:04

 /*
     This file is part of the KDE libraries
     SPDX-FileCopyrightText: 2000 Stephan Kulow <coolo@kde.org>
     SPDX-FileCopyrightText: 2000 David Faure <faure@kde.org>
     SPDX-FileCopyrightText: 2007 Thiago Macieira <thiago@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "connection_p.h"
 #include "connectionbackend_p.h"
 #include "kiocoredebug.h"
 #include <QDebug>
 
 #include <cerrno>
 
 using namespace KIO;
 
 void ConnectionPrivate::dequeue()
 {
     if (!backend || suspended) {
         return;
     }
 
     for (const Task &task : std::as_const(outgoingTasks)) {
         q->sendnow(task.cmd, task.data);
     }
     outgoingTasks.clear();
 
     if (!incomingTasks.isEmpty()) {
         Q_EMIT q->readyRead();
     }
 }
 
 void ConnectionPrivate::commandReceived(const Task &task)
 {
     // qDebug() << this << "Command" << task.cmd << "added to the queue";
     if (!suspended && incomingTasks.isEmpty() && readMode == Connection::ReadMode::EventDriven) {
         auto dequeueFunc = [this]() {
             dequeue();
         };
         QMetaObject::invokeMethod(q, dequeueFunc, Qt::QueuedConnection);
     }
     incomingTasks.append(task);
 }
 
 void ConnectionPrivate::disconnected()
 {
     q->close();
     if (readMode == Connection::ReadMode::EventDriven) {
         QMetaObject::invokeMethod(q, &Connection::readyRead, Qt::QueuedConnection);
     }
 }
 
 void ConnectionPrivate::setBackend(ConnectionBackend *b)
 {
     delete backend;
     backend = b;
     if (backend) {
         q->connect(backend, &ConnectionBackend::commandReceived, q, [this](const Task &task) {
             commandReceived(task);
         });
         q->connect(backend, &ConnectionBackend::disconnected, q, [this]() {
             disconnected();
         });
         backend->setSuspended(suspended);
     }
 }
 
 Connection::Connection(QObject *parent)
     : QObject(parent)
     , d(new ConnectionPrivate)
 {
     d->q = this;
 }
 
 Connection::~Connection()
 {
     close();
 }
 
 void Connection::suspend()
 {
     // qDebug() << this << "Suspended";
     d->suspended = true;
     if (d->backend) {
         d->backend->setSuspended(true);
     }
 }
 
 void Connection::resume()
 {
     // send any outgoing or incoming commands that may be in queue
     if (d->readMode == Connection::ReadMode::EventDriven) {
         auto dequeueFunc = [this]() {
             d->dequeue();
         };
         QMetaObject::invokeMethod(this, dequeueFunc, Qt::QueuedConnection);
     }
 
     // qDebug() << this << "Resumed";
     d->suspended = false;
     if (d->backend) {
         d->backend->setSuspended(false);
     }
 }
 
 void Connection::close()
 {
     if (d->backend) {
         d->backend->disconnect(this);
         d->backend->deleteLater();
         d->backend = nullptr;
     }
     d->outgoingTasks.clear();
     d->incomingTasks.clear();
 }
 
 bool Connection::isConnected() const
 {
     return d->backend && d->backend->state == ConnectionBackend::Connected;
 }
 
 bool Connection::inited() const
 {
     return d->backend;
 }
 
 bool Connection::suspended() const
 {
     return d->suspended;
 }
 
 void Connection::connectToRemote(const QUrl &address)
 {
     // qDebug() << "Connection requested to" << address;
     const QString scheme = address.scheme();
 
     if (scheme == QLatin1String("local")) {
         d->setBackend(new ConnectionBackend(this));
     } else {
         qCWarning(KIO_CORE) << "Unknown protocol requested:" << scheme << "(" << address << ")";
         Q_ASSERT(0);
         return;
     }
 
     // connection succeeded
     if (!d->backend->connectToRemote(address)) {
         // qCWarning(KIO_CORE) << "could not connect to" << address << "using scheme" << scheme;
         delete d->backend;
         d->backend = nullptr;
         return;
     }
 
     d->dequeue();
 }
 
 QString Connection::errorString() const
 {
     if (d->backend) {
         return d->backend->errorString;
     }
     return QString();
 }
 
 bool Connection::send(int cmd, const QByteArray &data)
 {
     if (!inited() || !d->outgoingTasks.isEmpty()) {
         Task task;
         task.cmd = cmd;
         task.data = data;
         d->outgoingTasks.append(std::move(task));
         return true;
     } else {
         return sendnow(cmd, data);
     }
 }
 
 bool Connection::sendnow(int cmd, const QByteArray &data)
 {
     if (!d->backend || data.size() > 0xffffff || !isConnected()) {
         return false;
     }
 
     // qDebug() << this << "Sending command" << cmd << "of size" << data.size();
     return d->backend->sendCommand(cmd, data);
 }
 
 bool Connection::hasTaskAvailable() const
 {
     return !d->incomingTasks.isEmpty();
 }
 
 bool Connection::waitForIncomingTask(int ms)
 {
     if (!isConnected()) {
         return false;
     }
 
     if (d->backend) {
         return d->backend->waitForIncomingTask(ms);
     }
     return false;
 }
 
 int Connection::read(int *_cmd, QByteArray &data)
 {
     // if it's still empty, then it's an error
     if (d->incomingTasks.isEmpty()) {
         // qCWarning(KIO_CORE) << this << "Task list is empty!";
         return -1;
     }
     const Task &task = d->incomingTasks.constFirst();
     // qDebug() << this << "Command" << task.cmd << "removed from the queue (size" << task.data.size() << ")";
     *_cmd = task.cmd;
     data = task.data;
 
     d->incomingTasks.removeFirst();
 
     // if we didn't empty our reading queue, emit again
     if (!d->suspended && !d->incomingTasks.isEmpty() && d->readMode == Connection::ReadMode::EventDriven) {
         auto dequeueFunc = [this]() {
             d->dequeue();
         };
         QMetaObject::invokeMethod(this, dequeueFunc, Qt::QueuedConnection);
     }
 
     return data.size();
 }
 
 void Connection::setReadMode(ReadMode readMode)
 {
     d->readMode = readMode;
 }
 
 #include "moc_connection_p.cpp"