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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2023 Maxim Devaev <[email protected]> #
# #
# This program 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. #
# #
# This program 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 this program. If not, see <https://www.gnu.org/licenses/>. #
# #
# ========================================================================== #
import os
import select
import multiprocessing
import queue
import errno
import logging
import time
from typing import Generator
from ....logging import get_logger
from .... import tools
from .... import aiomulti
from .... import aioproc
from .... import usb
from .events import BaseEvent
# =====
class BaseDeviceProcess(multiprocessing.Process): # pylint: disable=too-many-instance-attributes
def __init__( # pylint: disable=too-many-arguments
self,
name: str,
read_size: int,
initial_state: dict,
notifier: aiomulti.AioProcessNotifier,
device_path: str,
select_timeout: float,
queue_timeout: float,
write_retries: int,
noop: bool,
) -> None:
super().__init__(daemon=True)
self.__name = name
self.__read_size = read_size
self.__device_path = device_path
self.__select_timeout = select_timeout
self.__queue_timeout = queue_timeout
self.__write_retries = write_retries
self.__noop = noop
self.__udc_state_path = ""
self.__fd = -1
self.__events_queue: "multiprocessing.Queue[BaseEvent]" = multiprocessing.Queue()
self.__state_flags = aiomulti.AioSharedFlags({"online": True, **initial_state}, notifier)
self.__stop_event = multiprocessing.Event()
self.__no_device_reported = False
self.__logger: (logging.Logger | None) = None
def start(self, udc: str) -> None: # type: ignore # pylint: disable=arguments-differ
self.__udc_state_path = usb.get_udc_path(udc, usb.U_STATE)
super().start()
def run(self) -> None: # pylint: disable=too-many-branches
self.__logger = aioproc.settle(f"HID-{self.__name}", f"hid-{self.__name}")
report = b""
retries = 0
while not self.__stop_event.is_set():
try:
while not self.__stop_event.is_set():
if self.__ensure_device():
self.__read_all_reports()
try:
event = self.__events_queue.get(timeout=self.__queue_timeout)
except queue.Empty:
# Проблема в том, что устройство может отвечать EAGAIN или ESHUTDOWN,
# если оно было отключено физически. См:
# - https://github.com/raspberrypi/linux/issues/3870
# - https://github.com/raspberrypi/linux/pull/3151
# Так что нам нужно проверять состояние контроллера, чтобы не спамить
# в устройство и отслеживать его состояние.
if not self.__is_udc_configured():
self.__state_flags.update(online=False)
else:
# Посылка свежих репортов важнее старого
for report in self._process_event(event):
retries = self.__write_retries
if self.__ensure_device():
if self.__write_report(report):
retries = 0
continue
# Повторение последнего репорта до победного или пока не кончатся попытки
if retries > 0 and self.__ensure_device():
if self.__write_report(report):
retries = 0
else:
retries -= 1
except Exception:
self.__logger.exception("Unexpected HID-%s error", self.__name)
time.sleep(1)
self.__close_device()
async def get_state(self) -> dict:
return (await self.__state_flags.get())
# =====
def _process_event(self, event: BaseEvent) -> Generator[bytes, None, None]:
_ = event
if self is not None: # XXX: Vulture and pylint hack
raise NotImplementedError()
yield
def _process_read_report(self, report: bytes) -> None:
pass
def _update_state(self, **kwargs: bool) -> None:
assert "online" not in kwargs
self.__state_flags.update(**kwargs)
# =====
def _stop(self) -> None:
if self.is_alive():
get_logger().info("Stopping HID-%s daemon ...", self.__name)
self.__stop_event.set()
if self.is_alive() or self.exitcode is not None:
self.join()
def _queue_event(self, event: BaseEvent) -> None:
self.__events_queue.put_nowait(event)
def _clear_queue(self) -> None:
tools.clear_queue(self.__events_queue)
def _cleanup_write(self, report: bytes) -> None:
assert not self.is_alive()
assert self.__fd < 0
if self.__ensure_device():
self.__write_report(report)
self.__close_device()
# =====
def __get_logger(self) -> logging.Logger:
# Внутри процесса логгер из цикла, снаружи - каждый раз берем новый
if self.__logger is not None:
return self.__logger
return get_logger()
def __is_udc_configured(self) -> bool:
with open(self.__udc_state_path) as file:
return (file.read().strip().lower() == "configured")
def __write_report(self, report: bytes) -> bool:
assert report
if self.__noop:
return True
assert self.__fd >= 0
logger = self.__get_logger()
try:
written = os.write(self.__fd, report)
if written == len(report):
self.__state_flags.update(online=True)
return True
else:
logger.error("HID-%s write() error: written (%s) != report length (%d)",
self.__name, written, len(report))
except Exception as err:
if isinstance(err, OSError) and (
# https://github.com/raspberrypi/linux/commit/61b7f805dc2fd364e0df682de89227e94ce88e25
err.errno == errno.EAGAIN # pylint: disable=no-member
or err.errno == errno.ESHUTDOWN # pylint: disable=no-member
):
logger.debug("HID-%s busy/unplugged (write): %s", self.__name, tools.efmt(err))
else:
logger.exception("Can't write report to HID-%s", self.__name)
self.__state_flags.update(online=False)
return False
def __read_all_reports(self) -> None:
if self.__noop or self.__read_size == 0:
return
assert self.__fd >= 0
logger = self.__get_logger()
read = True
while read:
try:
read = bool(select.select([self.__fd], [], [], 0)[0])
except Exception as err:
logger.error("Can't select() for read HID-%s: %s", self.__name, tools.efmt(err))
break
if read:
try:
report = os.read(self.__fd, self.__read_size)
except Exception as err:
if isinstance(err, OSError) and err.errno == errno.EAGAIN: # pylint: disable=no-member
logger.debug("HID-%s busy/unplugged (read): %s", self.__name, tools.efmt(err))
else:
logger.exception("Can't read report from HID-%s", self.__name)
else:
self._process_read_report(report)
def __ensure_device(self) -> bool:
if self.__noop:
return True
logger = self.__get_logger()
if not os.path.exists(self.__device_path):
# Во-первых, не пытаемся открыть устройство, если его нет.
# Во-вторых, если у нас из под ног вытаскивают UDC, то надо закрыть устройство,
# чтобы избежать гонки при пересоздании оного.
self.__close_device()
self.__state_flags.update(online=False)
if not self.__no_device_reported:
logger.error("Missing HID-%s device: %s", self.__name, self.__device_path)
self.__no_device_reported = True
return False
self.__no_device_reported = False
if self.__fd < 0:
if os.path.exists(self.__device_path):
try:
flags = os.O_NONBLOCK
flags |= (os.O_RDWR if self.__read_size else os.O_WRONLY)
self.__fd = os.open(self.__device_path, flags)
except Exception as err:
logger.error("Can't open HID-%s device %s: %s",
self.__name, self.__device_path, tools.efmt(err))
if self.__fd >= 0:
try:
if select.select([], [self.__fd], [], self.__select_timeout)[1]:
# Закомментировано, потому что иногда запись доступна, но устройство отключено
# self.__state_flags.update(online=True)
return True
else:
# Если запись недоступна, то скорее всего устройство отключено
logger.debug("HID-%s is busy/unplugged (write select)", self.__name)
except Exception as err:
logger.error("Can't select() for write HID-%s: %s", self.__name, tools.efmt(err))
self.__state_flags.update(online=False)
return False
def __close_device(self) -> None:
if self.__fd >= 0:
try:
os.close(self.__fd)
except Exception:
pass
finally:
self.__fd = -1
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