input-remapper/tests/testcases/injector.py

#!/usr/bin/python3
# -*- coding: utf-8 -*-
# key-mapper - GUI for device specific keyboard mappings
# Copyright (C) 2020 sezanzeb <proxima@hip70890b.de>
#
# This file is part of key-mapper.
#
# key-mapper 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 3 of the License, or
# (at your option) any later version.
#
# key-mapper 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 key-mapper.  If not, see <https://www.gnu.org/licenses/>.


import unittest

import evdev

from keymapper.injector import _start_injecting_worker, _grab, \
    is_numlock_on, toggle_numlock, ensure_numlock, _modify_capabilities, \
    KeycodeInjector
from keymapper.getdevices import get_devices
from keymapper.state import custom_mapping, system_mapping

from test import uinput_write_history, Event, pending_events, fixtures


class TestInjector(unittest.TestCase):
    @classmethod
    def setUpClass(cls):
        cls.injector = None
        cls.grab = evdev.InputDevice.grab

    def setUp(self):
        self.failed = 0

        def grab_fail_twice(_):
            if self.failed < 2:
                self.failed += 1
                raise OSError()

        evdev.InputDevice.grab = grab_fail_twice

    def tearDown(self):
        if self.injector is not None:
            self.injector.stop_injecting()
            self.injector = None
        evdev.InputDevice.grab = self.grab
        if pending_events.get('device 2') is not None:
            del pending_events['device 2']

    def test_modify_capabilities(self):
        class FakeDevice:
            def capabilities(self, absinfo=True):
                assert absinfo is False
                return {
                    evdev.ecodes.EV_SYN: [1, 2, 3],
                    evdev.ecodes.EV_FF: [1, 2, 3]
                }

        capabilities = _modify_capabilities(FakeDevice())

        self.assertIn(evdev.ecodes.EV_KEY, capabilities)
        self.assertIsInstance(capabilities[evdev.ecodes.EV_KEY], list)
        self.assertIsInstance(capabilities[evdev.ecodes.EV_KEY][0], int)

        self.assertNotIn(evdev.ecodes.EV_SYN, capabilities)
        self.assertNotIn(evdev.ecodes.EV_FF, capabilities)

    def test_grab(self):
        # path is from the fixtures
        path = '/dev/input/event11'
        device = _grab(path)
        self.assertEqual(self.failed, 2)
        # success on the third try
        device.name = fixtures[path]['name']

    def test_numlock(self):
        before = is_numlock_on()

        toggle_numlock()  # should change
        self.assertEqual(not before, is_numlock_on())

        @ensure_numlock
        def wrapped():
            toggle_numlock()

        wrapped()  # should not change
        self.assertEqual(not before, is_numlock_on())

        # toggle one more time to restore the previous configuration
        toggle_numlock()
        self.assertEqual(before, is_numlock_on())

    def test_injector_constructor(self):
        # this buys some time to test if the process is alive. 2 (20ms) would
        # already be enough
        pending_events['device 2'] = [Event(1, 31, 1)] * 10

        injector2 = None
        try:
            injector2 = KeycodeInjector('device 2')
            self.assertEqual(len(injector2.processes), 1)
            self.assertEqual(injector2.processes[0].is_alive(), True)
            injector2.processes[0].join()
        except Exception as error:
            # make sure to not cause race conditions for other tests
            # if this test fails
            if injector2 is not None:
                for p in injector2.processes:
                    p.join()
            raise error

    def test_injector(self):
        device = get_devices()['device 2']

        custom_mapping.change(9, 'a')
        # one mapping that is unknown in the system_mapping on purpose
        custom_mapping.change(10, 'b')

        system_mapping.empty()
        system_mapping.change(100, 'a')

        # the second arg of those event objects is 8 lower than the
        # keycode used in X and in the mappings
        pending_events['device 2'] = [
            Event(evdev.events.EV_KEY, 1, 1),
            Event(evdev.events.EV_KEY, 1, 0),
            # ignored because unknown to the system
            Event(evdev.events.EV_KEY, 2, 1),
            Event(evdev.events.EV_KEY, 2, 0),
            # just pass those over without modifying
            Event(3124, 3564, 6542),
        ]

        class FakePipe:
            def send(self, message):
                pass

        _start_injecting_worker(
            path=device['paths'][0],
            pipe=FakePipe(),
            mapping=custom_mapping
        )

        self.assertEqual(uinput_write_history[0].type, evdev.events.EV_KEY)
        self.assertEqual(uinput_write_history[0].code, 92)
        self.assertEqual(uinput_write_history[0].value, 1)

        self.assertEqual(uinput_write_history[1].type, evdev.events.EV_KEY)
        self.assertEqual(uinput_write_history[1].code, 92)
        self.assertEqual(uinput_write_history[1].value, 0)

        self.assertEqual(uinput_write_history[2].type, 3124)
        self.assertEqual(uinput_write_history[2].code, 3564)
        self.assertEqual(uinput_write_history[2].value, 6542)


if __name__ == "__main__":
    unittest.main()