Add a dbus method getWindowInfo returning same data as queryWindowInfo

Summary:
This dbus method is intended to be used by the kwin rules dialog. KWin
can pass the internal id to the rules dialog through a command line
argument (or similar way) and the dialog can query the information
through the dbus call for the provided id. Thus it's possible to
implement one way to query the information which works on both X11 and
Wayland without any windowing system specific functionality.

Test Plan: See new added integration test

Reviewers: #kwin

Subscribers: kwin

Tags: #kwin

Differential Revision: https://phabricator.kde.org/D17433
icc-effect-5.17.5
Martin Flöser 2018-12-08 17:06:51 +01:00
parent c20be6e0f1
commit 9993c6d674
5 changed files with 463 additions and 26 deletions

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@ -76,6 +76,7 @@ if (XCB_ICCCM_FOUND)
integrationTest(NAME testSceneQPainter SRCS scene_qpainter_test.cpp LIBS XCB::ICCCM)
integrationTest(NAME testSceneQPainterShadow SRCS scene_qpainter_shadow_test.cpp LIBS XCB::ICCCM)
integrationTest(NAME testStackingOrder SRCS stacking_order_test.cpp LIBS XCB::ICCCM)
integrationTest(NAME testDbusInterface SRCS dbus_interface_test.cpp LIBS XCB::ICCCM)
if (KWIN_BUILD_ACTIVITIES)
integrationTest(NAME testActivities SRCS activities_test.cpp LIBS XCB::ICCCM)

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@ -0,0 +1,413 @@
/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2018 Martin Flöser <mgraesslin@kde.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) version 3 or any later version
accepted by the membership of KDE e.V. (or its successor approved
by the membership of KDE e.V.), which shall act as a proxy
defined in Section 14 of version 3 of the license.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#include "kwin_wayland_test.h"
#include "atoms.h"
#include "client.h"
#include "deleted.h"
#include "platform.h"
#include "rules.h"
#include "screens.h"
#include "shell_client.h"
#include "virtualdesktops.h"
#include "wayland_server.h"
#include "workspace.h"
#include <KWayland/Client/shell.h>
#include <KWayland/Client/surface.h>
#include <KWayland/Client/xdgshell.h>
#include <QDBusArgument>
#include <QDBusConnection>
#include <QDBusMessage>
#include <QDBusPendingReply>
#include <QUuid>
#include <netwm.h>
#include <xcb/xcb_icccm.h>
using namespace KWin;
using namespace KWayland::Client;
static const QString s_socketName = QStringLiteral("wayland_test_kwin_dbus_interface-0");
const QString s_destination{QStringLiteral("org.kde.KWin")};
const QString s_path{QStringLiteral("/KWin")};
const QString s_interface{QStringLiteral("org.kde.KWin")};
class TestDbusInterface : public QObject
{
Q_OBJECT
private Q_SLOTS:
void initTestCase();
void init();
void cleanup();
void testGetWindowInfoInvalidUuid();
void testGetWindowInfoShellClient_data();
void testGetWindowInfoShellClient();
void testGetWindowInfoX11Client();
};
void TestDbusInterface::initTestCase()
{
qRegisterMetaType<KWin::Deleted*>();
qRegisterMetaType<KWin::ShellClient*>();
qRegisterMetaType<KWin::AbstractClient*>();
QSignalSpy workspaceCreatedSpy(kwinApp(), &Application::workspaceCreated);
QVERIFY(workspaceCreatedSpy.isValid());
kwinApp()->platform()->setInitialWindowSize(QSize(1280, 1024));
QVERIFY(waylandServer()->init(s_socketName.toLocal8Bit()));
kwinApp()->start();
QVERIFY(workspaceCreatedSpy.wait());
waylandServer()->initWorkspace();
VirtualDesktopManager::self()->setCount(4);
}
void TestDbusInterface::init()
{
QVERIFY(Test::setupWaylandConnection());
}
void TestDbusInterface::cleanup()
{
Test::destroyWaylandConnection();
}
namespace {
QDBusPendingCall getWindowInfo(const QUuid &uuid)
{
auto msg = QDBusMessage::createMethodCall(s_destination, s_path, s_interface, QStringLiteral("getWindowInfo"));
msg.setArguments({uuid.toString()});
return QDBusConnection::sessionBus().asyncCall(msg);
}
}
void TestDbusInterface::testGetWindowInfoInvalidUuid()
{
QDBusPendingReply<QVariantMap> reply{getWindowInfo(QUuid::createUuid())};
reply.waitForFinished();
QVERIFY(reply.isValid());
QVERIFY(!reply.isError());
const auto windowData = reply.value();
QVERIFY(windowData.empty());
}
void TestDbusInterface::testGetWindowInfoShellClient_data()
{
QTest::addColumn<Test::ShellSurfaceType>("type");
QTest::newRow("wlShell") << Test::ShellSurfaceType::WlShell;
QTest::newRow("xdgShellV5") << Test::ShellSurfaceType::XdgShellV5;
QTest::newRow("xdgShellV6") << Test::ShellSurfaceType::XdgShellV6;
QTest::newRow("xdgWmBase") << Test::ShellSurfaceType::XdgShellStable;
}
void TestDbusInterface::testGetWindowInfoShellClient()
{
QSignalSpy clientAddedSpy(waylandServer(), &WaylandServer::shellClientAdded);
QVERIFY(clientAddedSpy.isValid());
QScopedPointer<Surface> surface(Test::createSurface());
QFETCH(Test::ShellSurfaceType, type);
QScopedPointer<QObject> shellSurface(Test::createShellSurface(type, surface.data()));
if (type != Test::ShellSurfaceType::WlShell) {
qobject_cast<XdgShellSurface*>(shellSurface.data())->setAppId(QByteArrayLiteral("org.kde.foo"));
qobject_cast<XdgShellSurface*>(shellSurface.data())->setTitle(QStringLiteral("Test window"));
}
// now let's render
Test::render(surface.data(), QSize(100, 50), Qt::blue);
QVERIFY(clientAddedSpy.isEmpty());
QVERIFY(clientAddedSpy.wait());
auto client = clientAddedSpy.first().first().value<ShellClient*>();
QVERIFY(client);
// let's get the window info
QDBusPendingReply<QVariantMap> reply{getWindowInfo(client->internalId())};
reply.waitForFinished();
QVERIFY(reply.isValid());
QVERIFY(!reply.isError());
auto windowData = reply.value();
QVERIFY(!windowData.isEmpty());
QCOMPARE(windowData.size(), 23);
QCOMPARE(windowData.value(QStringLiteral("type")).toInt(), NET::Normal);
QCOMPARE(windowData.value(QStringLiteral("x")).toInt(), client->x());
QCOMPARE(windowData.value(QStringLiteral("y")).toInt(), client->y());
QCOMPARE(windowData.value(QStringLiteral("width")).toInt(), client->width());
QCOMPARE(windowData.value(QStringLiteral("height")).toInt(), client->height());
QCOMPARE(windowData.value(QStringLiteral("x11DesktopNumber")).toInt(), 1);
QCOMPARE(windowData.value(QStringLiteral("minimized")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("shaded")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("fullscreen")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("keepAbove")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("keepBelow")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("skipTaskbar")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("skipPager")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("skipSwitcher")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("maximizeHorizontal")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("maximizeVertical")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("noBorder")).toBool(), true);
QCOMPARE(windowData.value(QStringLiteral("clientMachine")).toString(), QString());
QCOMPARE(windowData.value(QStringLiteral("role")).toString(), QString());
QCOMPARE(windowData.value(QStringLiteral("resourceName")).toString(), QStringLiteral("testDbusInterface"));
if (type == Test::ShellSurfaceType::WlShell) {
QCOMPARE(windowData.value(QStringLiteral("resourceClass")).toString(), QString());
QCOMPARE(windowData.value(QStringLiteral("desktopFile")).toString(), QString());
QCOMPARE(windowData.value(QStringLiteral("caption")).toString(), QString());
} else {
QCOMPARE(windowData.value(QStringLiteral("resourceClass")).toString(), QStringLiteral("org.kde.foo"));
QCOMPARE(windowData.value(QStringLiteral("desktopFile")).toString(), QStringLiteral("org.kde.foo"));
QCOMPARE(windowData.value(QStringLiteral("caption")).toString(), QStringLiteral("Test window"));
}
auto verifyProperty = [client] (const QString &name) {
QDBusPendingReply<QVariantMap> reply{getWindowInfo(client->internalId())};
reply.waitForFinished();
return reply.value().value(name).toBool();
};
QVERIFY(!client->isMinimized());
client->setMinimized(true);
QVERIFY(client->isMinimized());
QCOMPARE(verifyProperty(QStringLiteral("minimized")), true);
QVERIFY(!client->keepAbove());
client->setKeepAbove(true);
QVERIFY(client->keepAbove());
QCOMPARE(verifyProperty(QStringLiteral("keepAbove")), true);
QVERIFY(!client->keepBelow());
client->setKeepBelow(true);
QVERIFY(client->keepBelow());
QCOMPARE(verifyProperty(QStringLiteral("keepBelow")), true);
QVERIFY(!client->skipTaskbar());
client->setSkipTaskbar(true);
QVERIFY(client->skipTaskbar());
QCOMPARE(verifyProperty(QStringLiteral("skipTaskbar")), true);
QVERIFY(!client->skipPager());
client->setSkipPager(true);
QVERIFY(client->skipPager());
QCOMPARE(verifyProperty(QStringLiteral("skipPager")), true);
QVERIFY(!client->skipSwitcher());
client->setSkipSwitcher(true);
QVERIFY(client->skipSwitcher());
QCOMPARE(verifyProperty(QStringLiteral("skipSwitcher")), true);
// not testing shaded as that's X11
// not testing fullscreen, maximizeHorizontal, maximizeVertical and noBorder as those require window geometry changes
QCOMPARE(client->desktop(), 1);
workspace()->sendClientToDesktop(client, 2, false);
QCOMPARE(client->desktop(), 2);
reply = getWindowInfo(client->internalId());
reply.waitForFinished();
QCOMPARE(reply.value().value(QStringLiteral("x11DesktopNumber")).toInt(), 2);
client->move(10, 20);
reply = getWindowInfo(client->internalId());
reply.waitForFinished();
QCOMPARE(reply.value().value(QStringLiteral("x")).toInt(), client->x());
QCOMPARE(reply.value().value(QStringLiteral("y")).toInt(), client->y());
// not testing width, height as that would require window geometry change
// finally close window
const auto id = client->internalId();
QSignalSpy windowClosedSpy(client, &ShellClient::windowClosed);
QVERIFY(windowClosedSpy.isValid());
shellSurface.reset();
surface.reset();
QVERIFY(windowClosedSpy.wait());
QCOMPARE(windowClosedSpy.count(), 1);
reply = getWindowInfo(id);
reply.waitForFinished();
QVERIFY(reply.value().empty());
}
struct XcbConnectionDeleter
{
static inline void cleanup(xcb_connection_t *pointer)
{
xcb_disconnect(pointer);
}
};
void TestDbusInterface::testGetWindowInfoX11Client()
{
QScopedPointer<xcb_connection_t, XcbConnectionDeleter> c(xcb_connect(nullptr, nullptr));
QVERIFY(!xcb_connection_has_error(c.data()));
const QRect windowGeometry(0, 0, 600, 400);
xcb_window_t w = xcb_generate_id(c.data());
xcb_create_window(c.data(), XCB_COPY_FROM_PARENT, w, rootWindow(),
windowGeometry.x(),
windowGeometry.y(),
windowGeometry.width(),
windowGeometry.height(),
0, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_COPY_FROM_PARENT, 0, nullptr);
xcb_size_hints_t hints;
memset(&hints, 0, sizeof(hints));
xcb_icccm_size_hints_set_position(&hints, 1, windowGeometry.x(), windowGeometry.y());
xcb_icccm_size_hints_set_size(&hints, 1, windowGeometry.width(), windowGeometry.height());
xcb_icccm_set_wm_normal_hints(c.data(), w, &hints);
xcb_icccm_set_wm_class(c.data(), w, 7, "foo\0bar");
NETWinInfo winInfo(c.data(), w, rootWindow(), NET::Properties(), NET::Properties2());
winInfo.setName("Some caption");
winInfo.setDesktopFileName("org.kde.foo");
xcb_map_window(c.data(), w);
xcb_flush(c.data());
// we should get a client for it
QSignalSpy windowCreatedSpy(workspace(), &Workspace::clientAdded);
QVERIFY(windowCreatedSpy.isValid());
QVERIFY(windowCreatedSpy.wait());
Client *client = windowCreatedSpy.first().first().value<Client*>();
QVERIFY(client);
QCOMPARE(client->window(), w);
QCOMPARE(client->clientSize(), windowGeometry.size());
// let's get the window info
QDBusPendingReply<QVariantMap> reply{getWindowInfo(client->internalId())};
reply.waitForFinished();
QVERIFY(reply.isValid());
QVERIFY(!reply.isError());
auto windowData = reply.value();
QVERIFY(!windowData.isEmpty());
QCOMPARE(windowData.size(), 23);
QCOMPARE(windowData.value(QStringLiteral("type")).toInt(), NET::Normal);
QCOMPARE(windowData.value(QStringLiteral("x")).toInt(), client->x());
QCOMPARE(windowData.value(QStringLiteral("y")).toInt(), client->y());
QCOMPARE(windowData.value(QStringLiteral("width")).toInt(), client->width());
QCOMPARE(windowData.value(QStringLiteral("height")).toInt(), client->height());
QCOMPARE(windowData.value(QStringLiteral("x11DesktopNumber")).toInt(), 1);
QCOMPARE(windowData.value(QStringLiteral("minimized")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("shaded")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("fullscreen")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("keepAbove")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("keepBelow")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("skipTaskbar")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("skipPager")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("skipSwitcher")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("maximizeHorizontal")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("maximizeVertical")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("noBorder")).toBool(), false);
QCOMPARE(windowData.value(QStringLiteral("role")).toString(), QString());
QCOMPARE(windowData.value(QStringLiteral("resourceName")).toString(), QStringLiteral("foo"));
QCOMPARE(windowData.value(QStringLiteral("resourceClass")).toString(), QStringLiteral("bar"));
QCOMPARE(windowData.value(QStringLiteral("desktopFile")).toString(), QStringLiteral("org.kde.foo"));
QCOMPARE(windowData.value(QStringLiteral("caption")).toString(), QStringLiteral("Some caption"));
// not testing clientmachine as that is system dependent
auto verifyProperty = [client] (const QString &name) {
QDBusPendingReply<QVariantMap> reply{getWindowInfo(client->internalId())};
reply.waitForFinished();
return reply.value().value(name).toBool();
};
QVERIFY(!client->isMinimized());
client->setMinimized(true);
QVERIFY(client->isMinimized());
QCOMPARE(verifyProperty(QStringLiteral("minimized")), true);
QVERIFY(!client->keepAbove());
client->setKeepAbove(true);
QVERIFY(client->keepAbove());
QCOMPARE(verifyProperty(QStringLiteral("keepAbove")), true);
QVERIFY(!client->keepBelow());
client->setKeepBelow(true);
QVERIFY(client->keepBelow());
QCOMPARE(verifyProperty(QStringLiteral("keepBelow")), true);
QVERIFY(!client->skipTaskbar());
client->setSkipTaskbar(true);
QVERIFY(client->skipTaskbar());
QCOMPARE(verifyProperty(QStringLiteral("skipTaskbar")), true);
QVERIFY(!client->skipPager());
client->setSkipPager(true);
QVERIFY(client->skipPager());
QCOMPARE(verifyProperty(QStringLiteral("skipPager")), true);
QVERIFY(!client->skipSwitcher());
client->setSkipSwitcher(true);
QVERIFY(client->skipSwitcher());
QCOMPARE(verifyProperty(QStringLiteral("skipSwitcher")), true);
QVERIFY(!client->isShade());
client->setShade(ShadeNormal);
QVERIFY(client->isShade());
QCOMPARE(verifyProperty(QStringLiteral("shaded")), true);
client->setShade(ShadeNone);
QVERIFY(!client->isShade());
QVERIFY(!client->noBorder());
client->setNoBorder(true);
QVERIFY(client->noBorder());
QCOMPARE(verifyProperty(QStringLiteral("noBorder")), true);
client->setNoBorder(false);
QVERIFY(!client->noBorder());
QVERIFY(!client->isFullScreen());
client->setFullScreen(true);
QVERIFY(client->isFullScreen());
QVERIFY(client->clientSize() != windowGeometry.size());
QCOMPARE(verifyProperty(QStringLiteral("fullscreen")), true);
reply = getWindowInfo(client->internalId());
reply.waitForFinished();
QCOMPARE(reply.value().value(QStringLiteral("width")).toInt(), client->width());
QCOMPARE(reply.value().value(QStringLiteral("height")).toInt(), client->height());
client->setFullScreen(false);
QVERIFY(!client->isFullScreen());
// maximize
client->setMaximize(true, false);
QCOMPARE(verifyProperty(QStringLiteral("maximizeVertical")), true);
QCOMPARE(verifyProperty(QStringLiteral("maximizeHorizontal")), false);
client->setMaximize(false, true);
QCOMPARE(verifyProperty(QStringLiteral("maximizeVertical")), false);
QCOMPARE(verifyProperty(QStringLiteral("maximizeHorizontal")), true);
const auto id = client->internalId();
// destroy the window
xcb_unmap_window(c.data(), w);
xcb_flush(c.data());
QSignalSpy windowClosedSpy(client, &Client::windowClosed);
QVERIFY(windowClosedSpy.isValid());
QVERIFY(windowClosedSpy.wait());
xcb_destroy_window(c.data(), w);
c.reset();
reply = getWindowInfo(id);
reply.waitForFinished();
QVERIFY(reply.value().empty());
}
WAYLANDTEST_MAIN(TestDbusInterface)
#include "dbus_interface_test.moc"

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@ -189,6 +189,37 @@ void DBusInterface::showDebugConsole()
console->show();
}
namespace {
QVariantMap clientToVariantMap(const AbstractClient *c)
{
return {
{QStringLiteral("resourceClass"), c->resourceClass()},
{QStringLiteral("resourceName"), c->resourceName()},
{QStringLiteral("desktopFile"), c->desktopFileName()},
{QStringLiteral("role"), c->windowRole()},
{QStringLiteral("caption"), c->captionNormal()},
{QStringLiteral("clientMachine"), c->wmClientMachine(true)},
{QStringLiteral("type"), c->windowType()},
{QStringLiteral("x"), c->x()},
{QStringLiteral("y"), c->y()},
{QStringLiteral("width"), c->width()},
{QStringLiteral("height"), c->height()},
{QStringLiteral("x11DesktopNumber"), c->desktop()},
{QStringLiteral("minimized"), c->isMinimized()},
{QStringLiteral("shaded"), c->isShade()},
{QStringLiteral("fullscreen"), c->isFullScreen()},
{QStringLiteral("keepAbove"), c->keepAbove()},
{QStringLiteral("keepBelow"), c->keepBelow()},
{QStringLiteral("noBorder"), c->noBorder()},
{QStringLiteral("skipTaskbar"), c->skipTaskbar()},
{QStringLiteral("skipPager"), c->skipPager()},
{QStringLiteral("skipSwitcher"), c->skipSwitcher()},
{QStringLiteral("maximizeHorizontal"), c->maximizeMode() & MaximizeHorizontal},
{QStringLiteral("maximizeVertical"), c->maximizeMode() & MaximizeVertical}
};
}
}
QVariantMap DBusInterface::queryWindowInfo()
{
m_replyQueryWindowInfo = message();
@ -196,32 +227,7 @@ QVariantMap DBusInterface::queryWindowInfo()
kwinApp()->platform()->startInteractiveWindowSelection(
[this] (Toplevel *t) {
if (auto c = qobject_cast<AbstractClient*>(t)) {
const QVariantMap ret{
{QStringLiteral("resourceClass"), c->resourceClass()},
{QStringLiteral("resourceName"), c->resourceName()},
{QStringLiteral("desktopFile"), c->desktopFileName()},
{QStringLiteral("role"), c->windowRole()},
{QStringLiteral("caption"), c->captionNormal()},
{QStringLiteral("clientMachine"), c->wmClientMachine(true)},
{QStringLiteral("type"), c->windowType()},
{QStringLiteral("x"), c->x()},
{QStringLiteral("y"), c->y()},
{QStringLiteral("width"), c->width()},
{QStringLiteral("height"), c->height()},
{QStringLiteral("x11DesktopNumber"), c->desktop()},
{QStringLiteral("minimized"), c->isMinimized()},
{QStringLiteral("shaded"), c->isShade()},
{QStringLiteral("fullscreen"), c->isFullScreen()},
{QStringLiteral("keepAbove"), c->keepAbove()},
{QStringLiteral("keepBelow"), c->keepBelow()},
{QStringLiteral("noBorder"), c->noBorder()},
{QStringLiteral("skipTaskbar"), c->skipTaskbar()},
{QStringLiteral("skipPager"), c->skipPager()},
{QStringLiteral("skipSwitcher"), c->skipSwitcher()},
{QStringLiteral("maximizeHorizontal"), c->maximizeMode() & MaximizeHorizontal},
{QStringLiteral("maximizeVertical"), c->maximizeMode() & MaximizeVertical}
};
QDBusConnection::sessionBus().send(m_replyQueryWindowInfo.createReply(ret));
QDBusConnection::sessionBus().send(m_replyQueryWindowInfo.createReply(clientToVariantMap(c)));
} else {
QDBusConnection::sessionBus().send(m_replyQueryWindowInfo.createErrorReply(QString(), QString()));
}
@ -230,6 +236,17 @@ QVariantMap DBusInterface::queryWindowInfo()
return QVariantMap{};
}
QVariantMap DBusInterface::getWindowInfo(const QString &uuid)
{
const auto id = QUuid::fromString(uuid);
const auto client = workspace()->findAbstractClient([&id] (const AbstractClient *c) { return c->internalId() == id; });
if (client) {
return clientToVariantMap(client);
} else {
return {};
}
}
CompositorDBusInterface::CompositorDBusInterface(Compositor *parent)
: QObject(parent)
, m_compositor(parent)

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@ -70,6 +70,7 @@ public Q_SLOTS: // METHODS
Q_NOREPLY void showDebugConsole();
QVariantMap queryWindowInfo();
QVariantMap getWindowInfo(const QString &uuid);
private Q_SLOTS:
void becomeKWinService(const QString &service);

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@ -40,5 +40,10 @@
<annotation name="org.qtproject.QtDBus.QtTypeName.Out0" value="QVariantMap"/>
<arg type="a{sv}" direction="out"/>
</method>
<method name="getWindowInfo">
<annotation name="org.qtproject.QtDBus.QtTypeName.Out0" value="QVariantMap"/>
<arg type="s" direction="in"/>
<arg type="a{sv}" direction="out"/>
</method>
</interface>
</node>