/**************************************************************************** ** ** Copyright (C) 2019 The Qt Company Ltd. ** Contact: https://www.qt.io/licensing/ ** ** This file is part of the QtQml module of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see https://www.qt.io/terms-conditions. For further ** information use the contact form at https://www.qt.io/contact-us. ** ** GNU Lesser General Public License Usage ** Alternatively, this file may be used under the terms of the GNU Lesser ** General Public License version 3 as published by the Free Software ** Foundation and appearing in the file LICENSE.LGPL3 included in the ** packaging of this file. Please review the following information to ** ensure the GNU Lesser General Public License version 3 requirements ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 2.0 or (at your option) the GNU General ** Public license version 3 or any later version approved by the KDE Free ** Qt Foundation. The licenses are as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 ** included in the packaging of this file. Please review the following ** information to ensure the GNU General Public License requirements will ** be met: https://www.gnu.org/licenses/gpl-2.0.html and ** https://www.gnu.org/licenses/gpl-3.0.html. ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #include #include #include #include #include #include #include #include #ifdef DATABLOB_DEBUG #define ASSERT_CALLBACK() do { if (!m_typeLoader || !m_typeLoader->m_thread->isThisThread()) qFatal("QQmlDataBlob: An API call was made outside a callback"); } while (false) #else #define ASSERT_CALLBACK() #endif DEFINE_BOOL_CONFIG_OPTION(dumpErrors, QML_DUMP_ERRORS); QT_BEGIN_NAMESPACE /*! \class QQmlDataBlob \brief The QQmlDataBlob encapsulates a data request that can be issued to a QQmlTypeLoader. \internal QQmlDataBlob's are loaded by a QQmlTypeLoader. The user creates the QQmlDataBlob and then calls QQmlTypeLoader::load() or QQmlTypeLoader::loadWithStaticData() to load it. The QQmlTypeLoader invokes callbacks on the QQmlDataBlob as data becomes available. */ /*! \enum QQmlDataBlob::Status This enum describes the status of the data blob. \list \li Null The blob has not yet been loaded by a QQmlTypeLoader \li Loading The blob is loading network data. The QQmlDataBlob::setData() callback has not yet been invoked or has not yet returned. \li WaitingForDependencies The blob is waiting for dependencies to be done before continuing. This status only occurs after the QQmlDataBlob::setData() callback has been made, and when the blob has outstanding dependencies. \li Complete The blob's data has been loaded and all dependencies are done. \li Error An error has been set on this blob. \endlist */ /*! \enum QQmlDataBlob::Type This enum describes the type of the data blob. \list \li QmlFile This is a QQmlTypeData \li JavaScriptFile This is a QQmlScriptData \li QmldirFile This is a QQmlQmldirData \endlist */ /*! Create a new QQmlDataBlob for \a url and of the provided \a type. */ QQmlDataBlob::QQmlDataBlob(const QUrl &url, Type type, QQmlTypeLoader *manager) : m_typeLoader(manager), m_type(type), m_url(url), m_finalUrl(url), m_redirectCount(0), m_inCallback(false), m_isDone(false) { //Set here because we need to get the engine from the manager if (const QQmlEngine *qmlEngine = m_typeLoader->engine()) m_url = qmlEngine->interceptUrl(m_url, (QQmlAbstractUrlInterceptor::DataType)m_type); } /*! \internal */ QQmlDataBlob::~QQmlDataBlob() { Q_ASSERT(m_waitingOnMe.isEmpty()); cancelAllWaitingFor(); } /*! Must be called before loading can occur. */ void QQmlDataBlob::startLoading() { Q_ASSERT(status() == QQmlDataBlob::Null); m_data.setStatus(QQmlDataBlob::Loading); } /*! Returns the type provided to the constructor. */ QQmlDataBlob::Type QQmlDataBlob::type() const { return m_type; } /*! Returns the blob's status. */ QQmlDataBlob::Status QQmlDataBlob::status() const { return m_data.status(); } /*! Returns true if the status is Null. */ bool QQmlDataBlob::isNull() const { return status() == Null; } /*! Returns true if the status is Loading. */ bool QQmlDataBlob::isLoading() const { return status() == Loading; } /*! Returns true if the status is WaitingForDependencies. */ bool QQmlDataBlob::isWaiting() const { return status() == WaitingForDependencies || status() == ResolvingDependencies; } /*! Returns true if the status is Complete. */ bool QQmlDataBlob::isComplete() const { return status() == Complete; } /*! Returns true if the status is Error. */ bool QQmlDataBlob::isError() const { return status() == Error; } /*! Returns true if the status is Complete or Error. */ bool QQmlDataBlob::isCompleteOrError() const { Status s = status(); return s == Error || s == Complete; } /*! Returns the data download progress from 0 to 1. */ qreal QQmlDataBlob::progress() const { quint8 p = m_data.progress(); if (p == 0xFF) return 1.; else return qreal(p) / qreal(0xFF); } /*! Returns the physical url of the data. Initially this is the same as finalUrl(), but if a URL interceptor is set, it will work on this URL and leave finalUrl() alone. \sa finalUrl() */ QUrl QQmlDataBlob::url() const { return m_url; } QString QQmlDataBlob::urlString() const { if (m_urlString.isEmpty()) m_urlString = m_url.toString(); return m_urlString; } /*! Returns the logical URL to be used for resolving further URLs referred to in the code. This is the blob url passed to the constructor. If a URL interceptor rewrites the URL, this one stays the same. If a network redirect happens while fetching the data, this url is updated to reflect the new location. Therefore, if both an interception and a redirection happen, the final url will indirectly incorporate the result of the interception, potentially breaking further lookups. \sa url() */ QUrl QQmlDataBlob::finalUrl() const { return m_finalUrl; } /*! Returns the finalUrl() as a string. */ QString QQmlDataBlob::finalUrlString() const { if (m_finalUrlString.isEmpty()) m_finalUrlString = m_finalUrl.toString(); return m_finalUrlString; } /*! Return the errors on this blob. May only be called from the load thread, or after the blob isCompleteOrError(). */ QList QQmlDataBlob::errors() const { Q_ASSERT(isCompleteOrError() || (m_typeLoader && m_typeLoader->m_thread->isThisThread())); return m_errors; } /*! Mark this blob as having \a errors. All outstanding dependencies will be cancelled. Requests to add new dependencies will be ignored. Entry into the Error state is irreversable. The setError() method may only be called from within a QQmlDataBlob callback. */ void QQmlDataBlob::setError(const QQmlError &errors) { ASSERT_CALLBACK(); QList l; l << errors; setError(l); } /*! \overload */ void QQmlDataBlob::setError(const QList &errors) { ASSERT_CALLBACK(); Q_ASSERT(status() != Error); Q_ASSERT(m_errors.isEmpty()); // m_errors must be set before the m_data fence m_errors.reserve(errors.count()); for (const QQmlError &error : errors) { if (error.url().isEmpty()) { QQmlError mutableError = error; mutableError.setUrl(url()); m_errors.append(mutableError); } else { m_errors.append(error); } } m_data.setStatus(Error); if (dumpErrors()) { qWarning().nospace() << "Errors for " << urlString(); for (int ii = 0; ii < errors.count(); ++ii) qWarning().nospace() << " " << qPrintable(errors.at(ii).toString()); } cancelAllWaitingFor(); if (!m_inCallback) tryDone(); } void QQmlDataBlob::setError(const QQmlJS::DiagnosticMessage &error) { QQmlError e; e.setColumn(qmlConvertSourceCoordinate(error.loc.startColumn)); e.setLine(qmlConvertSourceCoordinate(error.loc.startLine)); e.setDescription(error.message); e.setUrl(url()); setError(e); } void QQmlDataBlob::setError(const QString &description) { QQmlError e; e.setDescription(description); e.setUrl(url()); setError(e); } /*! Wait for \a blob to become complete or to error. If \a blob is already complete or in error, or this blob is already complete, this has no effect. The setError() method may only be called from within a QQmlDataBlob callback. */ void QQmlDataBlob::addDependency(QQmlDataBlob *blob) { ASSERT_CALLBACK(); Q_ASSERT(status() != Null); if (!blob || blob->status() == Error || blob->status() == Complete || status() == Error || status() == Complete || m_isDone) return; for (const auto &existingDep: qAsConst(m_waitingFor)) if (existingDep.data() == blob) return; m_data.setStatus(WaitingForDependencies); m_waitingFor.append(blob); blob->m_waitingOnMe.append(this); // Check circular dependency if (m_waitingOnMe.indexOf(blob) >= 0) { qWarning() << "Cyclic dependency detected between" << this->url().toString() << "and" << blob->url().toString(); m_data.setStatus(Error); } } /*! \fn void QQmlDataBlob::dataReceived(const Data &data) Invoked when data for the blob is received. Implementors should use this callback to determine a blob's dependencies. Within this callback you may call setError() or addDependency(). */ /*! Invoked once data has either been received or a network error occurred, and all dependencies are complete. You can set an error in this method, but you cannot add new dependencies. Implementors should use this callback to finalize processing of data. The default implementation does nothing. XXX Rename processData() or some such to avoid confusion between done() (processing thread) and completed() (main thread) */ void QQmlDataBlob::done() { } #if QT_CONFIG(qml_network) /*! Invoked if there is a network error while fetching this blob. The default implementation sets an appropriate QQmlError. */ void QQmlDataBlob::networkError(QNetworkReply::NetworkError networkError) { Q_UNUSED(networkError); QQmlError error; error.setUrl(m_url); const char *errorString = nullptr; switch (networkError) { default: errorString = "Network error"; break; case QNetworkReply::ConnectionRefusedError: errorString = "Connection refused"; break; case QNetworkReply::RemoteHostClosedError: errorString = "Remote host closed the connection"; break; case QNetworkReply::HostNotFoundError: errorString = "Host not found"; break; case QNetworkReply::TimeoutError: errorString = "Timeout"; break; case QNetworkReply::ProxyConnectionRefusedError: case QNetworkReply::ProxyConnectionClosedError: case QNetworkReply::ProxyNotFoundError: case QNetworkReply::ProxyTimeoutError: case QNetworkReply::ProxyAuthenticationRequiredError: case QNetworkReply::UnknownProxyError: errorString = "Proxy error"; break; case QNetworkReply::ContentAccessDenied: errorString = "Access denied"; break; case QNetworkReply::ContentNotFoundError: errorString = "File not found"; break; case QNetworkReply::AuthenticationRequiredError: errorString = "Authentication required"; break; }; error.setDescription(QLatin1String(errorString)); setError(error); } #endif // qml_network /*! Called if \a blob, which was previously waited for, has an error. The default implementation does nothing. */ void QQmlDataBlob::dependencyError(QQmlDataBlob *blob) { Q_UNUSED(blob); } /*! Called if \a blob, which was previously waited for, has completed. The default implementation does nothing. */ void QQmlDataBlob::dependencyComplete(QQmlDataBlob *blob) { Q_UNUSED(blob); } /*! Called when all blobs waited for have completed. This occurs regardless of whether they are in error, or complete state. The default implementation does nothing. */ void QQmlDataBlob::allDependenciesDone() { m_data.setStatus(QQmlDataBlob::ResolvingDependencies); } /*! Called when the download progress of this blob changes. \a progress goes from 0 to 1. This callback is only invoked if an asynchronous load for this blob is made. An asynchronous load is one in which the Asynchronous mode is specified explicitly, or one that is implicitly delayed due to a network operation. The default implementation does nothing. */ void QQmlDataBlob::downloadProgressChanged(qreal progress) { Q_UNUSED(progress); } /*! Invoked on the main thread sometime after done() was called on the load thread. You cannot modify the blobs state at all in this callback and cannot depend on the order or timeliness of these callbacks. Implementors should use this callback to notify dependencies on the main thread that the blob is done and not a lot else. This callback is only invoked if an asynchronous load for this blob is made. An asynchronous load is one in which the Asynchronous mode is specified explicitly, or one that is implicitly delayed due to a network operation. The default implementation does nothing. */ void QQmlDataBlob::completed() { } void QQmlDataBlob::tryDone() { if (status() != Loading && m_waitingFor.isEmpty() && !m_isDone) { m_isDone = true; addref(); #ifdef DATABLOB_DEBUG qWarning("QQmlDataBlob::done() %s", qPrintable(urlString())); #endif done(); if (status() != Error) m_data.setStatus(Complete); notifyAllWaitingOnMe(); // Locking is not required here, as anyone expecting callbacks must // already be protected against the blob being completed (as set above); #ifdef DATABLOB_DEBUG qWarning("QQmlDataBlob: Dispatching completed"); #endif m_typeLoader->m_thread->callCompleted(this); release(); } } void QQmlDataBlob::cancelAllWaitingFor() { while (m_waitingFor.count()) { QQmlRefPointer blob = m_waitingFor.takeLast(); Q_ASSERT(blob->m_waitingOnMe.contains(this)); blob->m_waitingOnMe.removeOne(this); } } void QQmlDataBlob::notifyAllWaitingOnMe() { while (m_waitingOnMe.count()) { QQmlDataBlob *blob = m_waitingOnMe.takeLast(); Q_ASSERT(std::any_of(blob->m_waitingFor.constBegin(), blob->m_waitingFor.constEnd(), [this](const QQmlRefPointer &waiting) { return waiting.data() == this; })); blob->notifyComplete(this); } } void QQmlDataBlob::notifyComplete(QQmlDataBlob *blob) { Q_ASSERT(blob->status() == Error || blob->status() == Complete); Q_TRACE_SCOPE(QQmlCompiling, blob->url()); QQmlCompilingProfiler prof(typeLoader()->profiler(), blob); m_inCallback = true; QQmlRefPointer blobRef; for (int i = 0; i < m_waitingFor.count(); ++i) { if (m_waitingFor.at(i).data() == blob) { blobRef = m_waitingFor.takeAt(i); break; } } Q_ASSERT(blobRef); if (blob->status() == Error) { dependencyError(blob); } else if (blob->status() == Complete) { dependencyComplete(blob); } if (!isError() && m_waitingFor.isEmpty()) allDependenciesDone(); m_inCallback = false; tryDone(); } QString QQmlDataBlob::SourceCodeData::readAll(QString *error) const { error->clear(); if (hasInlineSourceCode) return inlineSourceCode; QFile f(fileInfo.absoluteFilePath()); if (!f.open(QIODevice::ReadOnly)) { *error = f.errorString(); return QString(); } const qint64 fileSize = fileInfo.size(); if (uchar *mappedData = f.map(0, fileSize)) { QString source = QString::fromUtf8(reinterpret_cast(mappedData), fileSize); f.unmap(mappedData); return source; } QByteArray data(fileSize, Qt::Uninitialized); if (f.read(data.data(), data.length()) != data.length()) { *error = f.errorString(); return QString(); } return QString::fromUtf8(data); } QDateTime QQmlDataBlob::SourceCodeData::sourceTimeStamp() const { if (hasInlineSourceCode) return QDateTime(); return fileInfo.lastModified(); } bool QQmlDataBlob::SourceCodeData::exists() const { if (hasInlineSourceCode) return true; return fileInfo.exists(); } bool QQmlDataBlob::SourceCodeData::isEmpty() const { if (hasInlineSourceCode) return inlineSourceCode.isEmpty(); return fileInfo.size() == 0; } QT_END_NAMESPACE