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Add class QSaveFile.

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This QIODevice uses a temporary file for writing, so that in case of
write errors, the writing operation is canceled, without losing any
existing file. It also avoids having a partially-written file visible
by other processes, at the final destination.

Change-Id: I9482df45751cb890b1b6f1382ec2eea3eb980627
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
David Faure 2012-12-27 07:42:27 -05:00 committed by The Qt Project
parent e3a10e15ff
commit e993df8771
7 changed files with 727 additions and 0 deletions
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2
src/corelib/io/io.pri
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@ -28,6 +28,7 @@ HEADERS += \
io/qtemporaryfile_p.h \
io/qresource_p.h \
io/qresource_iterator_p.h \
io/qsavefile.h \
io/qstandardpaths.h \
io/qurl.h \
io/qurl_p.h \
@ -67,6 +68,7 @@ SOURCES += \
io/qtemporaryfile.cpp \
io/qresource.cpp \
io/qresource_iterator.cpp \
io/qsavefile.cpp \
io/qstandardpaths.cpp \
io/qurl.cpp \
io/qurlidna.cpp \

316
src/corelib/io/qsavefile.cpp Normal file
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@ -0,0 +1,316 @@
/****************************************************************************
**
** Copyright (C) 2012 David Faure <faure@kde.org>
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtCore 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qplatformdefs.h"
#include "qsavefile.h"
#include "private/qsavefile_p.h"
#include "qfileinfo.h"
#include "qabstractfileengine_p.h"
#include "qdebug.h"
#include "qtemporaryfile.h"
#include "private/qiodevice_p.h"
#include "private/qtemporaryfile_p.h"
QT_BEGIN_NAMESPACE
QSaveFilePrivate::QSaveFilePrivate()
: writeError(QFileDevice::NoError)
{
}
QSaveFilePrivate::~QSaveFilePrivate()
{
}
/*!
\class QSaveFile
\inmodule QtCore
\brief The QSaveFile class provides an interface for safely writing to files.
\ingroup io
\reentrant
\since 5.1
QSaveFile is an I/O device for writing text and binary files, without losing
existing data if the writing operation fails.
While writing, the contents will be written to a temporary file, and if
no error happened, commit() will move it to the final file. This ensures that
no data at the final file is lost in case an error happens while writing,
and no partially-written file is ever present at the final location. Always
use QSaveFile when saving entire documents to disk.
QSaveFile automatically detects errors while writing, such as the full partition
situation, where write() cannot write all the bytes. It will remember that
an error happened, and will discard the temporary file in commit().
Much like with QFile, the file is opened with open(). Data is usually read
and written using QDataStream or QTextStream, but you can also call the
QIODevice-inherited functions read(), readLine(), readAll(), write().
Unlike QFile, calling close() is not allowed. commit() replaces it. If commit()
was not called and the QSaveFile instance is destroyed, the temporary file is
discarded.
To abort saving due to an application error, call cancelWriting(), so that
even a call to commit() later on will not save.
\sa QTextStream, QDataStream, QFileInfo, QDir, QFile, QTemporaryFile
*/
/*!
Constructs a new file object with the given \a parent.
*/
QSaveFile::QSaveFile(QObject *parent)
: QFileDevice(*new QSaveFilePrivate, parent)
{
}
/*!
Constructs a new file object to represent the file with the given \a name.
*/
QSaveFile::QSaveFile(const QString &name)
: QFileDevice(*new QSaveFilePrivate, 0)
{
Q_D(QSaveFile);
d->fileName = name;
}
/*!
Constructs a new file object with the given \a parent to represent the
file with the specified \a name.
*/
QSaveFile::QSaveFile(const QString &name, QObject *parent)
: QFileDevice(*new QSaveFilePrivate, parent)
{
Q_D(QSaveFile);
d->fileName = name;
}
/*!
Destroys the file object, discarding the saved contents unless commit() was called.
*/
QSaveFile::~QSaveFile()
{
Q_D(QSaveFile);
QFileDevice::close();
if (d->fileEngine) {
d->fileEngine->remove();
delete d->fileEngine;
d->fileEngine = 0;
}
}
/*!
Returns the name set by setFileName() or to the QSaveFile
constructor.
\sa setFileName()
*/
QString QSaveFile::fileName() const
{
return d_func()->fileName;
}
/*!
Sets the \a name of the file. The name can have no path, a
relative path, or an absolute path.
\sa QFile::setFileName(), fileName()
*/
void QSaveFile::setFileName(const QString &name)
{
d_func()->fileName = name;
}
/*!
Opens the file using OpenMode \a mode, returning true if successful;
otherwise false.
Important: the \a mode must include QIODevice::WriteOnly.
It may also have additional flags, such as QIODevice::Text and QIODevice::Unbuffered.
QIODevice::ReadWrite and QIODevice::Append are not supported at the moment.
\sa QIODevice::OpenMode, setFileName()
*/
bool QSaveFile::open(OpenMode mode)
{
Q_D(QSaveFile);
if (isOpen()) {
qWarning("QSaveFile::open: File (%s) already open", qPrintable(fileName()));
return false;
}
unsetError();
if ((mode & (ReadOnly | WriteOnly)) == 0) {
qWarning("QSaveFile::open: Open mode not specified");
return false;
}
// In the future we could implement ReadWrite by copying from the existing file to the temp file...
if ((mode & ReadOnly) || (mode & Append)) {
qWarning("QSaveFile::open: Unsupported open mode 0x%x", int(mode));
return false;
}
// check if existing file is writable
QFileInfo existingFile(d->fileName);
if (existingFile.exists() && !existingFile.isWritable()) {
d->setError(QFileDevice::WriteError, QSaveFile::tr("Existing file %1 is not writable").arg(d->fileName));
d->writeError = QFileDevice::WriteError;
return false;
}
d->fileEngine = new QTemporaryFileEngine(d->fileName);
// Same as in QFile: QIODevice provides the buffering, so there's no need to request it from the file engine.
if (!d->fileEngine->open(mode | QIODevice::Unbuffered)) {
QFileDevice::FileError err = d->fileEngine->error();
if (err == QFileDevice::UnspecifiedError)
err = QFileDevice::OpenError;
d->setError(err, d->fileEngine->errorString());
delete d->fileEngine;
d->fileEngine = 0;
return false;
}
QFileDevice::open(mode);
if (existingFile.exists())
setPermissions(existingFile.permissions());
return true;
}
/*!
\reimp
This method has been made private so that it cannot be called, in order to prevent mistakes.
In order to finish writing the file, call commit().
If instead you want to abort writing, call cancelWriting().
*/
void QSaveFile::close()
{
qFatal("QSaveFile::close called");
}
/*!
Commits the changes to disk, if all previous writes were successful.
It is mandatory to call this at the end of the saving operation, otherwise the file will be
discarded.
If an error happened during writing, deletes the temporary file and returns false.
Otherwise, renames it to the final fileName and returns true on success.
Finally, closes the device.
\sa cancelWriting()
*/
bool QSaveFile::commit()
{
Q_D(QSaveFile);
if (!d->fileEngine)
return false;
if (!isOpen()) {
qWarning("QSaveFile::commit: File (%s) is not open", qPrintable(fileName()));
return false;
}
QFileDevice::close(); // calls flush()
// Sync to disk if possible. Ignore errors (e.g. not supported).
d->fileEngine->syncToDisk();
if (d->writeError != QFileDevice::NoError) {
d->fileEngine->remove();
d->writeError = QFileDevice::NoError;
delete d->fileEngine;
d->fileEngine = 0;
return false;
}
// atomically replace old file with new file
// Can't use QFile::rename for that, must use the file engine directly
Q_ASSERT(d->fileEngine);
if (!d->fileEngine->renameOverwrite(d->fileName)) {
d->setError(d->fileEngine->error(), d->fileEngine->errorString());
d->fileEngine->remove();
delete d->fileEngine;
d->fileEngine = 0;
return false;
}
delete d->fileEngine;
d->fileEngine = 0;
return true;
}
/*!
Cancels writing the new file.
If the application changes its mind while saving, it can call cancelWriting(),
which sets an error code so that commit() will discard the temporary file.
Alternatively, it can simply make sure not to call commit().
Further write operations are possible after calling this method, but none
of it will have any effect, the written file will be discarded.
\sa commit()
*/
void QSaveFile::cancelWriting()
{
Q_D(QSaveFile);
if (!isOpen())
return;
d->setError(QFileDevice::WriteError, QSaveFile::tr("Writing canceled by application"));
d->writeError = QFileDevice::WriteError;
}
/*!
\reimp
*/
qint64 QSaveFile::writeData(const char *data, qint64 len)
{
Q_D(QSaveFile);
if (d->writeError != QFileDevice::NoError)
return -1;
const qint64 ret = QFileDevice::writeData(data, len);
if (d->error != QFileDevice::NoError)
d->writeError = d->error;
return ret;
}
QT_END_NAMESPACE

94
src/corelib/io/qsavefile.h Normal file
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@ -0,0 +1,94 @@
/****************************************************************************
**
** Copyright (C) 2012 David Faure <faure@kde.org>
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtCore 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QSAVEFILE_H
#define QSAVEFILE_H
#include <QtCore/qfiledevice.h>
#include <QtCore/qstring.h>
#ifdef open
#error qsavefile.h must be included before any header file that defines open
#endif
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
class QAbstractFileEngine;
class QSaveFilePrivate;
class Q_CORE_EXPORT QSaveFile : public QFileDevice
{
Q_OBJECT
Q_DECLARE_PRIVATE(QSaveFile)
public:
explicit QSaveFile(const QString &name);
explicit QSaveFile(QObject *parent = 0);
explicit QSaveFile(const QString &name, QObject *parent);
~QSaveFile();
QString fileName() const Q_DECL_OVERRIDE;
void setFileName(const QString &name);
bool open(OpenMode flags) Q_DECL_OVERRIDE;
bool commit();
void cancelWriting();
protected:
qint64 writeData(const char *data, qint64 len) Q_DECL_OVERRIDE;
private:
void close() Q_DECL_OVERRIDE;
private:
Q_DISABLE_COPY(QSaveFile)
};
QT_END_NAMESPACE
QT_END_HEADER
#endif // QSAVEFILE_H

75
src/corelib/io/qsavefile_p.h Normal file
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@ -0,0 +1,75 @@
/****************************************************************************
**
** Copyright (C) 2012 David Faure <faure@kde.org>
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtCore 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QSAVEFILE_P_H
#define QSAVEFILE_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include "private/qfiledevice_p.h"
QT_BEGIN_NAMESPACE
class QSaveFilePrivate : public QFileDevicePrivate
{
Q_DECLARE_PUBLIC(QSaveFile)
protected:
QSaveFilePrivate();
~QSaveFilePrivate();
QString fileName;
QFileDevice::FileError writeError;
};
QT_END_NAMESPACE
#endif // QSAVEFILE_P_H

1
tests/auto/corelib/io/io.pro
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@ -20,6 +20,7 @@ SUBDIRS=\
qprocessenvironment \
qresourceengine \
qsettings \
qsavefile \
qstandardpaths \
qtemporarydir \
qtemporaryfile \

5
tests/auto/corelib/io/qsavefile/qsavefile.pro Normal file
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@ -0,0 +1,5 @@
CONFIG += testcase parallel_test
TARGET = tst_qsavefile
QT = core testlib
SOURCES = tst_qsavefile.cpp
TESTDATA += tst_qsavefile.cpp

234
tests/auto/corelib/io/qsavefile/tst_qsavefile.cpp Normal file
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@ -0,0 +1,234 @@
/****************************************************************************
**
** Copyright (C) 2012 David Faure <faure@kde.org>
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtCore 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtTest/QtTest>
#include <qcoreapplication.h>
#include <qstring.h>
#include <qtemporaryfile.h>
#include <qfile.h>
#include <qdir.h>
#include <qset.h>
#if defined(Q_OS_UNIX)
# include <unistd.h> // for geteuid
# include <sys/types.h>
#endif
#if defined(Q_OS_WIN)
# include <windows.h>
#endif
class tst_QSaveFile : public QObject
{
Q_OBJECT
public slots:
private slots:
void transactionalWrite();
void textStreamManualFlush();
void textStreamAutoFlush();
void saveTwice();
void transactionalWriteNoPermissions();
void transactionalWriteCanceled();
void transactionalWriteErrorRenaming();
};
void tst_QSaveFile::transactionalWrite()
{
QTemporaryDir dir;
const QString targetFile = dir.path() + QString::fromLatin1("/outfile");
QFile::remove(targetFile);
QSaveFile file(targetFile);
QVERIFY(file.open(QIODevice::WriteOnly));
QVERIFY(file.isOpen());
QCOMPARE(file.fileName(), targetFile);
QVERIFY(!QFile::exists(targetFile));
QCOMPARE(file.write("Hello"), Q_INT64_C(5));
QCOMPARE(file.error(), QFile::NoError);
QVERIFY(!QFile::exists(targetFile));
QVERIFY(file.commit());
QVERIFY(QFile::exists(targetFile));
QCOMPARE(file.fileName(), targetFile);
QFile reader(targetFile);
QVERIFY(reader.open(QIODevice::ReadOnly));
QCOMPARE(QString::fromLatin1(reader.readAll()), QString::fromLatin1("Hello"));
}
void tst_QSaveFile::saveTwice()
{
// Check that we can reuse a QSaveFile object
// (and test the case of an existing target file)
QTemporaryDir dir;
const QString targetFile = dir.path() + QString::fromLatin1("/outfile");
QSaveFile file(targetFile);
QVERIFY(file.open(QIODevice::WriteOnly));
QCOMPARE(file.write("Hello"), Q_INT64_C(5));
QVERIFY2(file.commit(), qPrintable(file.errorString()));
QVERIFY(file.open(QIODevice::WriteOnly));
QCOMPARE(file.write("World"), Q_INT64_C(5));
QVERIFY2(file.commit(), qPrintable(file.errorString()));
QFile reader(targetFile);
QVERIFY(reader.open(QIODevice::ReadOnly));
QCOMPARE(QString::fromLatin1(reader.readAll()), QString::fromLatin1("World"));
}
void tst_QSaveFile::textStreamManualFlush()
{
QTemporaryDir dir;
const QString targetFile = dir.path() + QString::fromLatin1("/outfile");
QSaveFile file(targetFile);
QVERIFY(file.open(QIODevice::WriteOnly));
QTextStream ts(&file);
ts << "Manual flush";
ts.flush();
QCOMPARE(file.error(), QFile::NoError);
QVERIFY(!QFile::exists(targetFile));
QVERIFY(file.commit());
QFile reader(targetFile);
QVERIFY(reader.open(QIODevice::ReadOnly));
QCOMPARE(QString::fromLatin1(reader.readAll().constData()), QString::fromLatin1("Manual flush"));
QFile::remove(targetFile);
}
void tst_QSaveFile::textStreamAutoFlush()
{
QTemporaryDir dir;
const QString targetFile = dir.path() + QString::fromLatin1("/outfile");
QSaveFile file(targetFile);
QVERIFY(file.open(QIODevice::WriteOnly));
QTextStream ts(&file);
ts << "Auto-flush.";
// no flush
QVERIFY(file.commit()); // QIODevice::close will emit aboutToClose, which will flush the stream
QFile reader(targetFile);
QVERIFY(reader.open(QIODevice::ReadOnly));
QCOMPARE(QString::fromLatin1(reader.readAll().constData()), QString::fromLatin1("Auto-flush."));
QFile::remove(targetFile);
}
void tst_QSaveFile::transactionalWriteNoPermissions()
{
#ifdef Q_OS_UNIX
if (::geteuid() == 0)
QSKIP("not valid running this test as root");
// You can write into /dev/zero, but you can't create a /dev/zero.XXXXXX temp file.
QSaveFile file("/dev/zero");
if (!QDir("/dev").exists())
QSKIP("/dev doesn't exist on this system");
QVERIFY(!file.open(QIODevice::WriteOnly));
QCOMPARE((int)file.error(), (int)QFile::OpenError);
QVERIFY(!file.commit());
#endif
}
void tst_QSaveFile::transactionalWriteCanceled()
{
QTemporaryDir dir;
const QString targetFile = dir.path() + QString::fromLatin1("/outfile");
QFile::remove(targetFile);
QSaveFile file(targetFile);
QVERIFY(file.open(QIODevice::WriteOnly));
QTextStream ts(&file);
ts << "This writing operation will soon be canceled.\n";
ts.flush();
QCOMPARE(file.error(), QFile::NoError);
QVERIFY(!QFile::exists(targetFile));
// We change our mind, let's abort writing
file.cancelWriting();
QVERIFY(!file.commit());
QVERIFY(!QFile::exists(targetFile)); // temp file was discarded
QCOMPARE(file.fileName(), targetFile);
}
void tst_QSaveFile::transactionalWriteErrorRenaming()
{
QTemporaryDir dir;
const QString targetFile = dir.path() + QString::fromLatin1("/outfile");
QSaveFile file(targetFile);
QVERIFY(file.open(QIODevice::WriteOnly));
QCOMPARE(file.write("Hello"), qint64(5));
QVERIFY(!QFile::exists(targetFile));
#ifdef Q_OS_UNIX
// Make rename() fail for lack of permissions in the directory
QFile dirAsFile(dir.path()); // yay, I have to use QFile to change a dir's permissions...
QVERIFY(dirAsFile.setPermissions(QFile::Permissions(0))); // no permissions
#else
// Windows: Make rename() fail for lack of permissions on an existing target file
QFile existingTargetFile(targetFile);
QVERIFY(existingTargetFile.open(QIODevice::WriteOnly));
QCOMPARE(file.write("Target"), qint64(6));
existingTargetFile.close();
QVERIFY(existingTargetFile.setPermissions(QFile::ReadOwner));
#endif
// The saving should fail.
QVERIFY(!file.commit());
#ifdef Q_OS_UNIX
QVERIFY(!QFile::exists(targetFile)); // renaming failed
#endif
QCOMPARE(file.error(), QFile::RenameError);
// Restore permissions so that the cleanup can happen
#ifdef Q_OS_UNIX
QVERIFY(dirAsFile.setPermissions(QFile::Permissions(QFile::ReadOwner | QFile::WriteOwner | QFile::ExeOwner)));
#else
QVERIFY(existingTargetFile.setPermissions(QFile::WriteOwner));
QVERIFY(existingTargetFile.remove());
#endif
}
QTEST_MAIN(tst_QSaveFile)
#include "tst_qsavefile.moc"