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import asyncio
import multiprocessing
import multiprocessing.queues
import queue
import struct
import pkgutil
import time
from typing import Dict
from typing import Set
from typing import NamedTuple
import yaml
import serial
import setproctitle
from .logging import get_logger
# =====
def _get_keymap() -> Dict[str, int]:
return yaml.load(pkgutil.get_data(__name__, "data/keymap.yaml").decode()) # type: ignore
_KEYMAP = _get_keymap()
class _KeyEvent(NamedTuple):
key: str
state: bool
class _MouseMoveEvent(NamedTuple):
to_x: int
to_y: int
class _MouseButtonEvent(NamedTuple):
button: str
state: bool
class _MouseWheelEvent(NamedTuple):
delta_y: int
class Hid(multiprocessing.Process):
def __init__(
self,
device_path: str,
speed: int,
) -> None:
super().__init__(daemon=True)
self.__device_path = device_path
self.__speed = speed
self.__pressed_keys: Set[str] = set()
self.__pressed_mouse_buttons: Set[str] = set()
self.__lock = asyncio.Lock()
self.__queue: multiprocessing.queues.Queue = multiprocessing.Queue()
self.__stop_event = multiprocessing.Event()
def start(self) -> None:
get_logger().info("Starting HID daemon ...")
super().start()
# TODO: add reset or power switching
async def send_key_event(self, key: str, state: bool) -> None:
if not self.__stop_event.is_set():
async with self.__lock:
if state and key not in self.__pressed_keys:
self.__pressed_keys.add(key)
self.__queue.put(_KeyEvent(key, state))
elif not state and key in self.__pressed_keys:
self.__pressed_keys.remove(key)
self.__queue.put(_KeyEvent(key, state))
async def send_mouse_move_event(self, to_x: int, to_y: int) -> None:
if not self.__stop_event.is_set():
async with self.__lock:
self.__queue.put(_MouseMoveEvent(to_x, to_y))
async def send_mouse_button_event(self, button: str, state: bool) -> None:
if not self.__stop_event.is_set():
async with self.__lock:
if state and button not in self.__pressed_mouse_buttons:
self.__pressed_mouse_buttons.add(button)
self.__queue.put(_MouseButtonEvent(button, state))
elif not state and button in self.__pressed_mouse_buttons:
self.__pressed_mouse_buttons.remove(button)
self.__queue.put(_MouseButtonEvent(button, state))
async def send_mouse_wheel_event(self, delta_y: int) -> None:
if not self.__stop_event.is_set():
async with self.__lock:
self.__queue.put(_MouseWheelEvent(delta_y))
async def clear_events(self) -> None:
if not self.__stop_event.is_set():
async with self.__lock:
self.__unsafe_clear_events()
async def cleanup(self) -> None:
async with self.__lock:
if self.is_alive():
self.__unsafe_clear_events()
get_logger().info("Stopping keyboard daemon ...")
self.__stop_event.set()
self.join()
else:
get_logger().warning("Emergency cleaning up HID events ...")
self.__emergency_clear_events()
def __unsafe_clear_events(self) -> None:
for button in self.__pressed_mouse_buttons:
self.__queue.put(_MouseButtonEvent(button, False))
self.__pressed_mouse_buttons.clear()
for key in self.__pressed_keys:
self.__queue.put(_KeyEvent(key, False))
self.__pressed_keys.clear()
def __emergency_clear_events(self) -> None:
try:
with serial.Serial(self.__device_path, self.__speed) as tty:
self.__send_clear_hid(tty)
except Exception:
get_logger().exception("Can't execute emergency clear HID events")
def run(self) -> None: # pylint: disable=too-many-branches
setproctitle.setproctitle("[hid] " + setproctitle.getproctitle())
try:
with serial.Serial(self.__device_path, self.__speed) as tty:
hid_ready = False
while True:
if hid_ready:
try:
event = self.__queue.get(timeout=0.05)
except queue.Empty:
pass
else:
if isinstance(event, _KeyEvent):
self.__send_key_event(tty, event)
elif isinstance(event, _MouseMoveEvent):
self.__send_mouse_move_event(tty, event)
elif isinstance(event, _MouseButtonEvent):
self.__send_mouse_button_event(tty, event)
elif isinstance(event, _MouseWheelEvent):
self.__send_mouse_wheel_event(tty, event)
else:
raise RuntimeError("Unknown HID event")
hid_ready = False
if tty.in_waiting:
while tty.in_waiting:
tty.read(tty.in_waiting)
hid_ready = True
else:
time.sleep(0.05)
if self.__stop_event.is_set() and self.__queue.qsize() == 0:
break
except Exception:
get_logger().exception("Unhandled exception")
raise
def __send_key_event(self, tty: serial.Serial, event: _KeyEvent) -> None:
code = _KEYMAP.get(event.key)
if code:
key_bytes = bytes([code])
assert len(key_bytes) == 1, (event, key_bytes)
tty.write(
b"\01"
+ key_bytes
+ (b"\01" if event.state else b"\00")
+ b"\00\00"
)
def __send_mouse_move_event(self, tty: serial.Serial, event: _MouseMoveEvent) -> None:
to_x = min(max(-32768, event.to_x), 32767)
to_y = min(max(-32768, event.to_y), 32767)
tty.write(b"\02" + struct.pack(">hh", to_x, to_y))
def __send_mouse_button_event(self, tty: serial.Serial, event: _MouseButtonEvent) -> None:
if event.button == "left":
code = (0b10000000 | (0b00001000 if event.state else 0))
elif event.button == "right":
code = (0b01000000 | (0b00000100 if event.state else 0))
else:
code = 0
if code:
tty.write(b"\03" + bytes([code]) + b"\00\00\00")
def __send_mouse_wheel_event(self, tty: serial.Serial, event: _MouseWheelEvent) -> None:
delta_y = min(max(-128, event.delta_y), 127)
tty.write(b"\04\00" + struct.pack(">b", delta_y) + b"\00\00")
def __send_clear_hid(self, tty: serial.Serial) -> None:
tty.write(b"\00\00\00\00\00")
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