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67a9fbf1fa
This fixes a race condition which frequently caused the `memory-monitor-dbus.py` test to fail. The registration of the `LowMemoryMonitor` object on the bus, and the `GMemoryMonitorDBus`’s connection to the warning signal raced, such that it was possible for the mock `LowMemoryMonitor` to emit a warning signal before the `GMemoryMonitorDBus` proxy was listening, and hence the proxy would never see the signal. Fix this by explicitly synchronising the two before proceeding to the tests. Make the same changes in the `memory-monitor-portal.py` test too, even though that one was not failing. This should remove the need for a 2s wait on every test run. Signed-off-by: Philip Withnall <pwithnall@gnome.org> Fixes: #2887
136 lines
5.0 KiB
Python
Executable File
136 lines
5.0 KiB
Python
Executable File
#!/usr/bin/python3
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# This program is free software; you can redistribute it and/or modify it under
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# the terms of the GNU Lesser General Public License as published by the Free
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# Software Foundation; either version 3 of the License, or (at your option) any
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# later version. See http://www.gnu.org/copyleft/lgpl.html for the full text
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# of the license.
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__author__ = 'Bastien Nocera'
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__email__ = 'hadess@hadess.net'
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__copyright__ = '(c) 2019 Red Hat Inc.'
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__license__ = 'LGPL 3+'
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import unittest
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import sys
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import subprocess
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import fcntl
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import os
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import taptestrunner
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try:
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# Do all non-standard imports here so we can skip the tests if any
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# needed packages are not available.
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import dbus
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import dbus.mainloop.glib
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import dbusmock
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from gi.repository import GLib
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from gi.repository import Gio
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dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
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class TestLowMemoryMonitor(dbusmock.DBusTestCase):
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'''Test GMemoryMonitorDBus'''
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@classmethod
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def setUpClass(klass):
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klass.start_system_bus()
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klass.dbus_con = klass.get_dbus(True)
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def setUp(self):
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try:
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Gio.MemoryMonitor
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except AttributeError:
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raise unittest.SkipTest('Low memory monitor not in '
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'introspection data. Requires '
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'GObject-Introspection ≥ 1.63.2')
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try:
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(self.p_mock, self.obj_lmm) = self.spawn_server_template(
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'low_memory_monitor', {}, stdout=subprocess.PIPE)
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except ModuleNotFoundError:
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raise unittest.SkipTest("Low memory monitor dbusmock template not "
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"found. Requires dbusmock ≥ 0.18.4.")
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# set log to nonblocking
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flags = fcntl.fcntl(self.p_mock.stdout, fcntl.F_GETFL)
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fcntl.fcntl(self.p_mock.stdout, fcntl.F_SETFL, flags | os.O_NONBLOCK)
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self.last_warning = -1
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self.dbusmock = dbus.Interface(self.obj_lmm, dbusmock.MOCK_IFACE)
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try:
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self.wait_for_bus_object('org.freedesktop.LowMemoryMonitor',
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'/org/freedesktop/LowMemoryMonitor',
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system_bus=True)
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except:
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raise
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self.memory_monitor = Gio.MemoryMonitor.dup_default()
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assert("GMemoryMonitorDBus" in str(self.memory_monitor))
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self.memory_monitor.connect("low-memory-warning", self.memory_warning_cb)
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self.mainloop = GLib.MainLoop()
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self.main_context = self.mainloop.get_context()
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# The LowMemoryMonitor API is stateless: it doesn’t expose any
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# properties, just a warning signal. Emit the signal in a loop until
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# the GMemoryMonitor instance has initialised and synchronised to
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# the right state.
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def emit_warning(level):
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self.dbusmock.EmitWarning(level)
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return GLib.SOURCE_CONTINUE
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idle_id = GLib.idle_add(emit_warning, 0)
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while self.last_warning != 0:
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self.main_context.iteration(True)
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GLib.source_remove(idle_id)
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def tearDown(self):
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self.p_mock.terminate()
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self.p_mock.wait()
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def assertEventually(self, condition, message=None, timeout=5):
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'''Assert that condition function eventually returns True.
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Timeout is in seconds, defaulting to 5 seconds. message is
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printed on failure.
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'''
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if not message:
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message = 'timed out waiting for ' + str(condition)
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def timed_out_cb(message):
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self.fail(message)
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return GLib.SOURCE_REMOVE
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timeout_source = GLib.timeout_source_new_seconds(timeout)
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timeout_source.set_callback(timed_out_cb, message)
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timeout_source.attach(self.main_context)
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while not condition():
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self.main_context.iteration(True)
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timeout_source.destroy()
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def memory_warning_cb(self, monitor, level):
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print("Received memory warning signal, level", level)
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self.last_warning = level
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self.main_context.wakeup()
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def test_low_memory_warning_signal(self):
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'''LowMemoryWarning signal'''
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self.dbusmock.EmitWarning(100)
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# Wait 2 seconds or until warning
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self.assertEventually(lambda: self.last_warning == 100, "'100' low-memory warning not received", 2)
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self.dbusmock.EmitWarning(255)
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# Wait 2 seconds or until warning
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self.assertEventually(lambda: self.last_warning == 255, "'255' low-memory warning not received", 2)
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except ImportError as e:
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@unittest.skip("Cannot import %s" % e.name)
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class TestLowMemoryMonitor(unittest.TestCase):
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def test_low_memory_warning_signal(self):
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pass
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if __name__ == '__main__':
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unittest.main(testRunner=taptestrunner.TAPTestRunner())
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