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# ========================================================================== #
# #
# KVMD - The main Pi-KVM daemon. #
# #
# Copyright (C) 2018 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 signal
import multiprocessing
import multiprocessing.queues
import queue
import errno
import time
import setproctitle
from ....logging import get_logger
# =====
class BaseEvent:
pass
class BaseDeviceProcess(multiprocessing.Process): # pylint: disable=too-many-instance-attributes
def __init__(
self,
name: str,
device_path: str,
select_timeout: float,
write_retries: int,
write_retries_delay: float,
noop: bool,
) -> None:
super().__init__(daemon=True)
self.__name = name
self.__device_path = device_path
self.__select_timeout = select_timeout
self.__write_retries = write_retries
self.__write_retries_delay = write_retries_delay
self.__noop = noop
self.__fd = -1
self.__events_queue: multiprocessing.queues.Queue = multiprocessing.Queue()
self.__online_shared = multiprocessing.Value("i", 1)
self.__stop_event = multiprocessing.Event()
def run(self) -> None:
logger = get_logger(0)
logger.info("Started HID-%s pid=%d", self.__name, os.getpid())
signal.signal(signal.SIGINT, signal.SIG_IGN)
setproctitle.setproctitle(f"kvmd/hid-{self.__name}: {setproctitle.getproctitle()}")
while not self.__stop_event.is_set():
try:
while not self.__stop_event.is_set():
passed = 0
try:
event: BaseEvent = self.__events_queue.get(timeout=0.05)
except queue.Empty:
if passed >= 20: # 20 * 0.05 = 1 sec
self._ensure_device() # Check device
passed = 0
else:
passed += 1
else:
self._process_event(event)
passed = 0
except Exception:
logger.exception("Unexpected HID-%s error", self.__name)
self._close_device()
finally:
time.sleep(1)
self._close_device()
def is_online(self) -> bool:
return bool(self.__online_shared.value and self.is_alive())
def _stop(self) -> None:
if self.is_alive():
get_logger().info("Stopping HID-%s daemon ...", self.__name)
self.__stop_event.set()
if self.exitcode is not None:
self.join()
def _process_event(self, event: BaseEvent) -> None:
raise NotImplementedError
def _queue_event(self, event: BaseEvent) -> None:
self.__events_queue.put(event)
def _write_report(self, report: bytes) -> bool:
if self.__noop:
return True
assert self.__fd >= 0
logger = get_logger()
retries = self.__write_retries
while retries:
try:
written = os.write(self.__fd, report)
if written == len(report):
self.__online_shared.value = 1
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 err.errno == errno.EAGAIN: # pylint: disable=no-member
logger.debug("HID-%s busy/unplugged (write): %s: %s",
self.__name, type(err).__name__, err)
else:
logger.exception("Can't write report to HID-%s", self.__name)
retries -= 1
if retries:
logger.debug("HID-%s write retries left: %d", self.__name, retries)
time.sleep(self.__write_retries_delay)
self._close_device()
return False
def _ensure_device(self) -> bool:
if self.__noop:
return True
logger = get_logger()
if self.__fd < 0:
try:
self.__fd = os.open(self.__device_path, os.O_WRONLY|os.O_NONBLOCK)
except FileNotFoundError:
logger.error("Missing HID-%s device: %s", self.__name, self.__device_path)
except Exception as err:
logger.error("Can't open HID-%s device: %s: %s: %s",
self.__name, self.__device_path, type(err).__name__, err)
if self.__fd >= 0:
try:
if select.select([], [self.__fd], [], self.__select_timeout)[1]:
self.__online_shared.value = 1
return True
else:
logger.debug("HID-%s is busy/unplugged (select)", self.__name)
except Exception as err:
logger.error("Can't select() HID-%s: %s: %s", self.__name, type(err).__name__, err)
self._close_device()
self.__online_shared.value = 0
return False
def _close_device(self) -> None:
if self.__fd >= 0:
try:
os.close(self.__fd)
except Exception:
pass
finally:
self.__fd = -1
|
