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Directory : /lib/python3/dist-packages/twisted/internet/test/
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Current File : /lib/python3/dist-packages/twisted/internet/test//test_gireactor.py
# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
GI/GTK3 reactor tests.
"""

from __future__ import division, absolute_import, print_function

import sys, os
try:
    from twisted.internet import gireactor
    from gi.repository import Gio
except ImportError:
    gireactor = None
    gtk3reactor = None
else:
    # gtk3reactor may be unavailable even if gireactor is available; in
    # particular in pygobject 3.4/gtk 3.6, when no X11 DISPLAY is found.
    try:
        from twisted.internet import gtk3reactor
    except ImportError:
        gtk3reactor = None
    else:
        from gi.repository import Gtk

from twisted.python.filepath import FilePath
from twisted.python.runtime import platform
from twisted.internet.defer import Deferred
from twisted.internet.error import ReactorAlreadyRunning
from twisted.internet.protocol import ProcessProtocol
from twisted.trial.unittest import TestCase, SkipTest
from twisted.internet.test.reactormixins import ReactorBuilder
from twisted.test.test_twisted import SetAsideModule
from twisted.internet.interfaces import IReactorProcess
from twisted.python.compat import _PY3

# Skip all tests if gi is unavailable:
if gireactor is None:
    skip = "gtk3/gi not importable"



class GApplicationRegistrationTests(ReactorBuilder, TestCase):
    """
    GtkApplication and GApplication are supported by
    L{twisted.internet.gtk3reactor} and L{twisted.internet.gireactor}.

    We inherit from L{ReactorBuilder} in order to use some of its
    reactor-running infrastructure, but don't need its test-creation
    functionality.
    """
    def runReactor(self, app, reactor):
        """
        Register the app, run the reactor, make sure app was activated, and
        that reactor was running, and that reactor can be stopped.
        """
        if not hasattr(app, "quit"):
            raise SkipTest("Version of PyGObject is too old.")

        result = []
        def stop():
            result.append("stopped")
            reactor.stop()
        def activate(widget):
            result.append("activated")
            reactor.callLater(0, stop)
        app.connect('activate', activate)

        # We want reactor.stop() to *always* stop the event loop, even if
        # someone has called hold() on the application and never done the
        # corresponding release() -- for more details see
        # http://developer.gnome.org/gio/unstable/GApplication.html.
        app.hold()

        reactor.registerGApplication(app)
        ReactorBuilder.runReactor(self, reactor)
        self.assertEqual(result, ["activated", "stopped"])


    def test_gApplicationActivate(self):
        """
        L{Gio.Application} instances can be registered with a gireactor.
        """
        reactor = gireactor.GIReactor(useGtk=False)
        self.addCleanup(self.unbuildReactor, reactor)
        app = Gio.Application(
            application_id='com.twistedmatrix.trial.gireactor',
            flags=Gio.ApplicationFlags.FLAGS_NONE)

        self.runReactor(app, reactor)


    def test_gtkApplicationActivate(self):
        """
        L{Gtk.Application} instances can be registered with a gtk3reactor.
        """
        reactor = gtk3reactor.Gtk3Reactor()
        self.addCleanup(self.unbuildReactor, reactor)
        app = Gtk.Application(
            application_id='com.twistedmatrix.trial.gtk3reactor',
            flags=Gio.ApplicationFlags.FLAGS_NONE)

        self.runReactor(app, reactor)

    if gtk3reactor is None:
        test_gtkApplicationActivate.skip = (
            "Gtk unavailable (may require running with X11 DISPLAY env set)")


    def test_portable(self):
        """
        L{gireactor.PortableGIReactor} doesn't support application
        registration at this time.
        """
        reactor = gireactor.PortableGIReactor()
        self.addCleanup(self.unbuildReactor, reactor)
        app = Gio.Application(
            application_id='com.twistedmatrix.trial.gireactor',
            flags=Gio.ApplicationFlags.FLAGS_NONE)
        self.assertRaises(NotImplementedError,
                          reactor.registerGApplication, app)


    def test_noQuit(self):
        """
        Older versions of PyGObject lack C{Application.quit}, and so won't
        allow registration.
        """
        reactor = gireactor.GIReactor(useGtk=False)
        self.addCleanup(self.unbuildReactor, reactor)
        # An app with no "quit" method:
        app = object()
        exc = self.assertRaises(RuntimeError, reactor.registerGApplication, app)
        self.assertTrue(exc.args[0].startswith(
                "Application registration is not"))


    def test_cantRegisterAfterRun(self):
        """
        It is not possible to register a C{Application} after the reactor has
        already started.
        """
        reactor = gireactor.GIReactor(useGtk=False)
        self.addCleanup(self.unbuildReactor, reactor)
        app = Gio.Application(
            application_id='com.twistedmatrix.trial.gireactor',
            flags=Gio.ApplicationFlags.FLAGS_NONE)

        def tryRegister():
            exc = self.assertRaises(ReactorAlreadyRunning,
                                    reactor.registerGApplication, app)
            self.assertEqual(exc.args[0],
                             "Can't register application after reactor was started.")
            reactor.stop()
        reactor.callLater(0, tryRegister)
        ReactorBuilder.runReactor(self, reactor)


    def test_cantRegisterTwice(self):
        """
        It is not possible to register more than one C{Application}.
        """
        reactor = gireactor.GIReactor(useGtk=False)
        self.addCleanup(self.unbuildReactor, reactor)
        app = Gio.Application(
            application_id='com.twistedmatrix.trial.gireactor',
            flags=Gio.ApplicationFlags.FLAGS_NONE)
        reactor.registerGApplication(app)
        app2 = Gio.Application(
            application_id='com.twistedmatrix.trial.gireactor2',
            flags=Gio.ApplicationFlags.FLAGS_NONE)
        exc = self.assertRaises(RuntimeError,
                                    reactor.registerGApplication, app2)
        self.assertEqual(exc.args[0],
                         "Can't register more than one application instance.")



class PygtkCompatibilityTests(TestCase):
    """
    pygtk imports are either prevented, or a compatibility layer is used if
    possible.
    """
    def test_noCompatibilityLayer(self):
        """
        If no compatibility layer is present, imports of gobject and friends
        are disallowed.

        We do this by running a process where we make sure gi.pygtkcompat
        isn't present.
        """
        if _PY3:
            raise SkipTest("Python3 always has the compatibility layer.")

        from twisted.internet import reactor
        if not IReactorProcess.providedBy(reactor):
            raise SkipTest("No process support available in this reactor.")

        result = Deferred()
        class Stdout(ProcessProtocol):
            data = b""

            def errReceived(self, err):
                print(err)

            def outReceived(self, data):
                self.data += data

            def processExited(self, reason):
                result.callback(self.data)

        path = FilePath(__file__).sibling(b"process_gireactornocompat.py").path
        pyExe = FilePath(sys.executable)._asBytesPath()
        # Pass in a PYTHONPATH that is the test runner's os.path, to make sure
        # we're running from a checkout
        reactor.spawnProcess(Stdout(), pyExe, [pyExe, path],
                             env={"PYTHONPATH": ":".join(sys.path)})
        result.addCallback(self.assertEqual, b"success")
        return result


    def test_compatibilityLayer(self):
        """
        If compatibility layer is present, importing gobject uses the gi
        compatibility layer.
        """
        if "gi.pygtkcompat" not in sys.modules:
            raise SkipTest("This version of gi doesn't include pygtkcompat.")
        import gobject
        self.assertTrue(gobject.__name__.startswith("gi."))



class Gtk3ReactorTests(TestCase):
    """
    Tests for L{gtk3reactor}.
    """

    def test_requiresDISPLAY(self):
        """
        On X11, L{gtk3reactor} is unimportable if the C{DISPLAY} environment
        variable is not set.
        """
        display = os.environ.get("DISPLAY", None)
        if display is not None:
            self.addCleanup(os.environ.__setitem__, "DISPLAY", display)
            del os.environ["DISPLAY"]
        with SetAsideModule("twisted.internet.gtk3reactor"):
            exc = self.assertRaises(ImportError,
                                    __import__, "twisted.internet.gtk3reactor")
            self.assertEqual(
                exc.args[0],
                "Gtk3 requires X11, and no DISPLAY environment variable is set")

    if platform.getType() != "posix" or platform.isMacOSX():
        test_requiresDISPLAY.skip = "This test is only relevant when using X11"
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