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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2022 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 asyncio
import functools
from typing import Tuple
from typing import Dict
from typing import Callable
from typing import Optional
from typing import Any
from ...logging import get_logger
from ... import tools
from ... import aiotools
from ...yamlconf import Option
from ...validators.basic import valid_number
from ...validators.basic import valid_float_f0
from ...validators.basic import valid_float_f01
from ...validators.net import valid_ip_or_host
from ...validators.net import valid_port
from . import BaseUserGpioDriver
from . import GpioDriverOfflineError
# =====
class Plugin(BaseUserGpioDriver): # pylint: disable=too-many-instance-attributes
def __init__(
self,
instance_name: str,
notifier: aiotools.AioNotifier,
host: str,
port: int,
timeout: float,
switch_delay: float,
state_poll: float,
) -> None:
super().__init__(instance_name, notifier)
self.__host = host
self.__port = port
self.__timeout = timeout
self.__switch_delay = switch_delay
self.__state_poll = state_poll
self.__reader: Optional[asyncio.StreamReader] = None
self.__writer: Optional[asyncio.StreamWriter] = None
self.__active: int = -1
self.__update_notifier = aiotools.AioNotifier()
@classmethod
def get_plugin_options(cls) -> Dict:
return {
"host": Option("", type=valid_ip_or_host),
"port": Option(5000, type=valid_port),
"timeout": Option(5.0, type=valid_float_f01),
"switch_delay": Option(1.0, type=valid_float_f0),
"state_poll": Option(10.0, type=valid_float_f01),
}
@classmethod
def get_pin_validator(cls) -> Callable[[Any], Any]:
return functools.partial(valid_number, min=0, max=15, name="Tesmart channel")
async def run(self) -> None:
prev_active = -2
while True:
await self.__update_notifier.wait(self.__state_poll)
try:
self.__active = await self.__send_command(b"\x10\x00")
except Exception:
pass
if self.__active != prev_active:
await self._notifier.notify()
prev_active = self.__active
async def cleanup(self) -> None:
await self.__close_device()
async def read(self, pin: str) -> bool:
return (self.__active == int(pin))
async def write(self, pin: str, state: bool) -> None:
channel = int(pin) + 1
assert 1 <= channel <= 16
if state:
await self.__send_command("{:c}{:c}".format(1, channel).encode())
await self.__update_notifier.notify()
await asyncio.sleep(self.__switch_delay) # Slowdown
# =====
async def __send_command(self, cmd: bytes) -> int:
assert len(cmd) == 2
(reader, writer) = await self.__ensure_device()
try:
writer.write(b"\xAA\xBB\x03%s\xEE" % (cmd))
await asyncio.wait_for(writer.drain(), timeout=self.__timeout)
return (await asyncio.wait_for(reader.readexactly(6), timeout=self.__timeout))[4]
except Exception as err:
get_logger(0).error("Can't send command to Tesmart KVM [%s]:%d: %s",
self.__host, self.__port, tools.efmt(err))
await self.__close_device()
raise GpioDriverOfflineError(self)
async def __ensure_device(self) -> Tuple[asyncio.StreamReader, asyncio.StreamWriter]:
if self.__reader is None or self.__writer is None:
try:
(reader, writer) = await asyncio.wait_for(
asyncio.open_connection(self.__host, self.__port),
timeout=self.__timeout,
)
except Exception as err:
get_logger(0).error("Can't connect to Tesmart KVM [%s]:%d: %s",
self.__host, self.__port, tools.efmt(err))
raise GpioDriverOfflineError(self)
else:
self.__reader = reader
self.__writer = writer
return (self.__reader, self.__writer)
async def __close_device(self) -> None:
if self.__writer:
await aiotools.close_writer(self.__writer)
self.__reader = None
self.__writer = None
self.__active = -1
# =====
def __str__(self) -> str:
return f"Tesmart({self._instance_name})"
__repr__ = __str__
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