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380 lines
13 KiB
Python
380 lines
13 KiB
Python
#!/usr/bin/python3
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# -*- coding: utf-8 -*-
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# key-mapper - GUI for device specific keyboard mappings
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# Copyright (C) 2020 sezanzeb <proxima@hip70890b.de>
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#
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# This file is part of key-mapper.
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#
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# key-mapper is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# key-mapper is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with key-mapper. If not, see <https://www.gnu.org/licenses/>.
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"""Keeps injecting keycodes in the background based on the mapping."""
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import re
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import asyncio
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import time
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import subprocess
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import multiprocessing
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import evdev
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from evdev.ecodes import EV_KEY, EV_ABS
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from keymapper.logger import logger
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from keymapper.getdevices import get_devices
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from keymapper.state import system_mapping, KEYCODE_OFFSET
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from keymapper.dev.keycode_mapper import handle_keycode
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from keymapper.dev.ev_abs_mapper import ev_abs_mapper
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from keymapper.dev.macros import parse
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DEV_NAME = 'key-mapper'
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CLOSE = 0
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def is_numlock_on():
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"""Get the current state of the numlock."""
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xset_q = subprocess.check_output(['xset', 'q']).decode()
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num_lock_status = re.search(
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r'Num Lock:\s+(.+?)\s',
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xset_q
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)
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if num_lock_status is not None:
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return num_lock_status[1] == 'on'
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return False
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def toggle_numlock():
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"""Turn the numlock on or off."""
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try:
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subprocess.check_output(['numlockx', 'toggle'])
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except FileNotFoundError:
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# doesn't seem to be installed everywhere
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logger.debug('numlockx not found, trying to inject a keycode')
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# and this doesn't always work.
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device = evdev.UInput(
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name=f'{DEV_NAME} numlock-control',
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phys=DEV_NAME,
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)
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device.write(EV_KEY, evdev.ecodes.KEY_NUMLOCK, 1)
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device.syn()
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device.write(EV_KEY, evdev.ecodes.KEY_NUMLOCK, 0)
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device.syn()
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def ensure_numlock(func):
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"""Decorator to reset the numlock to its initial state afterwards."""
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def wrapped(*args, **kwargs):
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# for some reason, grabbing a device can modify the num lock state.
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# remember it and apply back later
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numlock_before = is_numlock_on()
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result = func(*args, **kwargs)
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numlock_after = is_numlock_on()
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if numlock_after != numlock_before:
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logger.debug('Reverting numlock status to %s', numlock_before)
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toggle_numlock()
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return result
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return wrapped
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class KeycodeInjector:
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"""Keeps injecting keycodes in the background based on the mapping.
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Is a process to make it non-blocking for the rest of the code and to
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make running multiple injector easier. There is one procss per
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hardware-device that is being mapped.
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"""
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@ensure_numlock
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def __init__(self, device, mapping):
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"""Start injecting keycodes based on custom_mapping.
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Parameters
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----------
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device : string
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the name of the device as available in get_device
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"""
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self.device = device
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self.mapping = mapping
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self._process = None
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self._msg_pipe = multiprocessing.Pipe()
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# some EV_ABS mapping stuff
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self.abs_state = [0, 0]
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def start_injecting(self):
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"""Start injecting keycodes."""
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self._process = multiprocessing.Process(target=self._start_injecting)
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self._process.start()
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def _prepare_device(self, path):
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"""Try to grab the device, return if not needed/possible.
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Also return if ABS events are changed to REL mouse movements,
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because the capabilities of the returned device are changed
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so this cannot be checked later anymore.
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"""
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device = evdev.InputDevice(path)
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if device is None:
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return None, False
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capabilities = device.capabilities(absinfo=False)
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needed = False
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if capabilities.get(EV_KEY) is not None:
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for keycode, _ in self.mapping:
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if keycode - KEYCODE_OFFSET in capabilities[EV_KEY]:
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needed = True
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break
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map_ev_abs = evdev.ecodes.ABS_X in capabilities.get(EV_ABS, [])
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if map_ev_abs:
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needed = True
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if not needed:
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# skipping reading and checking on events from those devices
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# may be beneficial for performance.
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logger.debug('No need to grab %s', path)
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return None, False
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attempts = 0
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while True:
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device = evdev.InputDevice(path)
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try:
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# grab to avoid e.g. the disabled keycode of 10 to confuse
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# X, especially when one of the buttons of your mouse also
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# uses 10. This also avoids having to load an empty xkb
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# symbols file to prevent writing any unwanted keys.
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device.grab()
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break
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except IOError:
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attempts += 1
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# it might take a little time until the device is free if
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# it was previously grabbed.
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logger.debug('Failed attemts to grab %s: %d', path, attempts)
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if attempts >= 4:
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logger.error('Cannot grab %s, it is possibly in use', path)
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return None, False
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time.sleep(0.15)
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return device, map_ev_abs
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def _modify_capabilities(self, input_device, map_ev_abs):
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"""Adds all keycode into a copy of a devices capabilities.
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Prameters
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---------
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input_device : evdev.InputDevice
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map_ev_abs : bool
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if ABS capabilities should be removed in favor of REL
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"""
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ecodes = evdev.ecodes
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# copy the capabilities because the uinput is going
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# to act like the device.
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capabilities = input_device.capabilities(absinfo=False)
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# Furthermore, support all injected keycodes
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if len(self.mapping) > 0 and capabilities.get(ecodes.EV_KEY) is None:
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capabilities[ecodes.EV_KEY] = []
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for _, character in self.mapping:
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keycode = system_mapping.get(character)
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if keycode is not None:
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capabilities[ecodes.EV_KEY].append(keycode - KEYCODE_OFFSET)
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if map_ev_abs:
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del capabilities[ecodes.EV_ABS]
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capabilities[ecodes.EV_REL] = [
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evdev.ecodes.REL_X,
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evdev.ecodes.REL_Y,
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# for my system to recognize it as mouse, WHEEL is also needed:
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evdev.ecodes.REL_WHEEL,
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]
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# just like what python-evdev does in from_device
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if ecodes.EV_SYN in capabilities:
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del capabilities[ecodes.EV_SYN]
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if ecodes.EV_FF in capabilities:
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del capabilities[ecodes.EV_FF]
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return capabilities
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async def _msg_listener(self, loop):
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"""Wait for messages from the main process to do special stuff."""
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while True:
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frame_available = asyncio.Event()
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loop.add_reader(self._msg_pipe[0].fileno(), frame_available.set)
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await frame_available.wait()
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frame_available.clear()
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msg = self._msg_pipe[0].recv()
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if msg == CLOSE:
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logger.debug('Received close signal')
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# stop the event loop and cause the process to reach its end
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# cleanly. Using .terminate prevents coverage from working.
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loop.stop()
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return
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def _start_injecting(self):
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"""The injection worker that keeps injecting until terminated.
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Stuff is non-blocking by using asyncio in order to do multiple things
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somewhat concurrently.
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"""
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loop = asyncio.get_event_loop()
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coroutines = []
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logger.info('Starting injecting the mapping for %s', self.device)
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paths = get_devices()[self.device]['paths']
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# Watch over each one of the potentially multiple devices per hardware
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for path in paths:
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input_device, map_ev_abs = self._prepare_device(path)
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if input_device is None:
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continue
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# certain capabilities can have side effects apparently. with an
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# EV_ABS capability, EV_REL won't move the mouse pointer anymore.
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# so don't merge all InputDevices into one UInput device.
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uinput = evdev.UInput(
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name=f'{DEV_NAME} {self.device}',
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phys=DEV_NAME,
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events=self._modify_capabilities(input_device, map_ev_abs)
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)
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# keycode injection
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coroutine = self._keycode_loop(input_device, uinput, map_ev_abs)
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coroutines.append(coroutine)
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# mouse movement injection
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if map_ev_abs:
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self.abs_state[0] = 0
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self.abs_state[1] = 0
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coroutine = ev_abs_mapper(
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self.abs_state,
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input_device,
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uinput
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)
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coroutines.append(coroutine)
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if len(coroutines) == 0:
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logger.error('Did not grab any device')
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return
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coroutines.append(self._msg_listener(loop))
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try:
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loop.run_until_complete(asyncio.gather(*coroutines))
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except RuntimeError:
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# stopped event loop most likely
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pass
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if len(coroutines) > 0:
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logger.debug('asyncio coroutines ended')
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def _macro_write(self, character, value, uinput):
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"""Handler for macros."""
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keycode = system_mapping[character]
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logger.spam(
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'macro writes code:%s value:%d char:%s',
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keycode, value, character
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)
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uinput.write(EV_KEY, keycode - KEYCODE_OFFSET, value)
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uinput.syn()
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async def _keycode_loop(self, device, uinput, map_ev_abs):
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"""Inject keycodes for one of the virtual devices.
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Can be stopped by stopping the asyncio loop.
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Parameters
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----------
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device : evdev.InputDevice
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where to read keycodes from
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uinput : evdev.UInput
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where to write keycodes to
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map_ev_abs : bool
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if joystick events should be mapped to mouse movements
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"""
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# efficiently figure out the target keycode without taking
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# extra steps.
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code_code_mapping = {}
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# Parse all macros beforehand
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logger.debug('Parsing macros')
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macros = {}
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for keycode, output in self.mapping:
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keycode -= KEYCODE_OFFSET
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if '(' in output and ')' in output and len(output) >= 4:
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# probably a macro
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macros[keycode] = parse(
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output,
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lambda *args: self._macro_write(*args, uinput)
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)
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continue
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target_keycode = system_mapping.get(output)
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if target_keycode is None:
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logger.error('Don\'t know what %s is', output)
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continue
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code_code_mapping[keycode] = target_keycode - KEYCODE_OFFSET
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logger.debug(
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'Started injecting into %s, fd %s',
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uinput.device.path, uinput.fd
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)
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async for event in device.async_read_loop():
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if map_ev_abs and event.type == EV_ABS:
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if event.code not in [evdev.ecodes.ABS_X, evdev.ecodes.ABS_Y]:
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continue
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if event.code == evdev.ecodes.ABS_X:
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self.abs_state[0] = event.value
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if event.code == evdev.ecodes.ABS_Y:
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self.abs_state[1] = event.value
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continue
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if event.type != EV_KEY:
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uinput.write(event.type, event.code, event.value)
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# this already includes SYN events, so need to syn here again
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continue
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if event.value == 2:
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# linux does them itself, no need to trigger them
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continue
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handle_keycode(code_code_mapping, macros, event, uinput)
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# this should only ever happen in tests to avoid blocking them
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# forever, as soon as all events are consumed. In normal operation
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# there is no end to the events.
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logger.error(
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'The injector for "%s" stopped early',
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uinput.device.path
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)
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@ensure_numlock
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def stop_injecting(self):
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"""Stop injecting keycodes."""
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logger.info('Stopping injecting keycodes for device "%s"', self.device)
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self._msg_pipe[1].send(CLOSE)
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