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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 multiprocessing
import queue
import errno
import time
from typing import Dict
from ....logging import get_logger
from .... import tools
from .... import aiomulti
from .... import aioproc
from .usb import UsbDeviceController
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,
udc: UsbDeviceController,
device_path: str,
select_timeout: float,
write_retries: int,
write_retries_delay: float,
reopen_delay: float,
noop: bool,
) -> None:
super().__init__(daemon=True)
self.__name = name
self.__read_size = read_size
self.__udc = udc
self.__device_path = device_path
self.__select_timeout = select_timeout
self.__write_retries = write_retries
self.__write_retries_delay = write_retries_delay
self.__reopen_delay = reopen_delay
self.__noop = noop
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()
def run(self) -> None:
logger = aioproc.settle(f"HID-{self.__name}", f"hid-{self.__name}")
while not self.__stop_event.is_set():
try:
while not self.__stop_event.is_set():
if self.__ensure_device(): # Check device and process reports if needed
self.__read_all_reports()
try:
event = self.__events_queue.get(timeout=0.1)
except queue.Empty:
if not self.__udc.can_operate():
self._clear_queue()
self.__close_device()
else:
if not self._process_event(event):
self._clear_queue()
except Exception:
logger.exception("Unexpected HID-%s error", self.__name)
self._clear_queue()
self.__close_device()
time.sleep(1)
self.__close_device()
async def get_state(self) -> Dict:
return (await self.__state_flags.get())
# =====
def _process_event(self, event: BaseEvent) -> bool:
raise NotImplementedError
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.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 _ensure_write(self, report: bytes, reopen: bool=False, close: bool=False) -> bool:
if reopen:
self.__close_device()
try:
if self.__ensure_device():
return self.__write_report(report)
return False
finally:
if close:
self.__close_device()
# =====
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.__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: %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 __read_all_reports(self) -> None:
if self.__noop or self.__read_size == 0:
return
assert self.__fd >= 0
logger = 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: %s", self.__name, type(err).__name__, 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: %s",
self.__name, type(err).__name__, 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 = get_logger()
if self.__fd < 0:
if self.__udc.can_operate():
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 FileNotFoundError:
logger.error("Missing HID-%s device: %s", self.__name, self.__device_path)
time.sleep(self.__reopen_delay)
except Exception as err:
logger.error("Can't open HID-%s device: %s: %s: %s",
self.__name, self.__device_path, type(err).__name__, err)
time.sleep(self.__reopen_delay)
else:
time.sleep(self.__reopen_delay)
if self.__fd >= 0:
try:
if select.select([], [self.__fd], [], self.__select_timeout)[1]:
self.__state_flags.update(online=True)
return True
else:
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: %s", self.__name, type(err).__name__, err)
self.__close_device()
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
|
