mirror of
https://github.com/mofeng-git/One-KVM.git
synced 2025-12-12 01:00:29 +08:00
122 lines
4.4 KiB
Python
122 lines
4.4 KiB
Python
# ========================================================================== #
|
|
# #
|
|
# KVMD - The main PiKVM daemon. #
|
|
# #
|
|
# Copyright (C) 2018-2024 Maxim Devaev <mdevaev@gmail.com> #
|
|
# #
|
|
# 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 argparse
|
|
import errno
|
|
import time
|
|
|
|
from ...logging import get_logger
|
|
|
|
from ...yamlconf import Section
|
|
|
|
from ... import env
|
|
|
|
from .. import init
|
|
|
|
|
|
# =====
|
|
class RtcIsNotAvailableError(Exception):
|
|
pass
|
|
|
|
|
|
# =====
|
|
def _join_rtc(rtc: int, key: str) -> str:
|
|
return f"{env.SYSFS_PREFIX}/sys/class/rtc/rtc{rtc}/{key}"
|
|
|
|
|
|
def _read_int(rtc: int, key: str) -> int:
|
|
with open(_join_rtc(rtc, key)) as file:
|
|
return int(file.read().strip() or "0")
|
|
|
|
|
|
def _write_int(rtc: int, key: str, value: int) -> None:
|
|
with open(_join_rtc(rtc, key), "w") as file:
|
|
file.write(str(value))
|
|
|
|
|
|
def _reset_alarm(rtc: int, timeout: int) -> None:
|
|
try:
|
|
now = _read_int(rtc, "since_epoch")
|
|
except OSError as ex:
|
|
if ex.errno != errno.EINVAL:
|
|
raise
|
|
raise RtcIsNotAvailableError("Can't read since_epoch right now")
|
|
if now == 0:
|
|
raise RtcIsNotAvailableError("Current UNIX time == 0")
|
|
try:
|
|
for wake in [0, now + timeout]:
|
|
_write_int(rtc, "wakealarm", wake)
|
|
except OSError as ex:
|
|
if ex.errno != errno.EIO:
|
|
raise
|
|
raise RtcIsNotAvailableError("IO error, probably the supercapacitor is not charged")
|
|
|
|
|
|
# =====
|
|
def _cmd_run(config: Section) -> None:
|
|
logger = get_logger(0)
|
|
logger.info("Running watchdog loop on RTC%d ...", config.rtc)
|
|
fail = False
|
|
try:
|
|
while True:
|
|
try:
|
|
_reset_alarm(config.rtc, config.timeout)
|
|
except RtcIsNotAvailableError as ex:
|
|
if not fail:
|
|
logger.error("RTC%d is not available now: %s; waiting ...", config.rtc, ex)
|
|
fail = True
|
|
else:
|
|
if fail:
|
|
logger.info("RTC%d is available, working ...", config.rtc)
|
|
fail = False
|
|
time.sleep(config.interval)
|
|
except (SystemExit, KeyboardInterrupt):
|
|
if not fail:
|
|
_reset_alarm(config.rtc, config.timeout)
|
|
logger.info("The watchdog remains alarmed. Use 'kvmd-watchdog cancel' to disarm it")
|
|
logger.info("Bye-bye")
|
|
|
|
|
|
def _cmd_cancel(config: Section) -> None:
|
|
_write_int(config.rtc, "wakealarm", 0)
|
|
|
|
|
|
# =====
|
|
def main(argv: (list[str] | None)=None) -> None:
|
|
(parent_parser, argv, config) = init(add_help=False, argv=argv)
|
|
parser = argparse.ArgumentParser(
|
|
prog="kvmd-watchdog",
|
|
description="RTC-based hardware watchdog",
|
|
parents=[parent_parser],
|
|
)
|
|
parser.set_defaults(cmd=(lambda *_: parser.print_help()))
|
|
subparsers = parser.add_subparsers()
|
|
|
|
cmd_run_parser = subparsers.add_parser("run", help="Run watchdog loop")
|
|
cmd_run_parser.set_defaults(cmd=_cmd_run)
|
|
|
|
cmd_cancel_parser = subparsers.add_parser("cancel", help="Cancel armed timeout")
|
|
cmd_cancel_parser.set_defaults(cmd=_cmd_cancel)
|
|
|
|
options = parser.parse_args(argv[1:])
|
|
options.cmd(config.watchdog)
|