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# ========================================================================== #
# #
# KVMD - The main Pi-KVM daemon. #
# #
# Copyright (C) 2018-2021 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 time
from typing import Callable
from ...logging import get_logger
from ...plugins.hid import BaseHid
from ... import aiotools
from .streamer import Streamer
# =====
class Snapshoter: # pylint: disable=too-many-instance-attributes
def __init__(
self,
hid: BaseHid,
streamer: Streamer,
idle_interval: float,
live_interval: float,
wakeup_key: str,
wakeup_move: int,
online_delay: float,
retries: int,
retries_delay: float,
) -> None:
self.__hid = hid
self.__streamer = streamer
if idle_interval or live_interval:
self.__idle_interval = (idle_interval or live_interval)
self.__live_interval = (live_interval or idle_interval)
assert self.__idle_interval
assert self.__live_interval
else:
self.__idle_interval = self.__live_interval = 0.0
self.__wakeup_key = wakeup_key
self.__wakeup_move = wakeup_move
self.__online_delay = online_delay
self.__retries = retries
self.__retries_delay = retries_delay
self.__snapshoting = False
async def run(self, is_live: Callable[[], bool], notifier: aiotools.AioNotifier) -> None:
if self.__idle_interval or self.__live_interval:
get_logger(0).info("Running periodic stream snapshot: idle=%.2f; live=%.2f ...",
self.__idle_interval, self.__live_interval)
last_snapshot_ts = 0.0
while True:
live = is_live()
if last_snapshot_ts + (self.__live_interval if live else self.__idle_interval) < time.monotonic():
await self.__take_snapshot(live, notifier)
last_snapshot_ts = time.monotonic()
await asyncio.sleep(min(self.__idle_interval, self.__live_interval))
else:
await aiotools.wait_infinite()
def snapshoting(self) -> bool:
return self.__snapshoting
async def __take_snapshot(self, live: bool, notifier: aiotools.AioNotifier) -> None:
logger = get_logger(0)
if not live:
logger.info("Time to take the new idle snapshot")
try:
self.__snapshoting = True
await notifier.notify()
if not live:
await self.__wakeup()
retries = self.__retries
while retries:
snapshot = await self.__streamer.take_snapshot(save=True, load=False, allow_offline=False)
if snapshot:
if not live:
logger.info("New idle snapshot saved: %dx%d", snapshot.width, snapshot.height)
break
retries -= 1
await asyncio.sleep(self.__retries_delay)
else:
logger.error("Can't take snapshot after %d retries", self.__retries)
except Exception: # Этого вообще-то не должно случаться, апи внутри заэксцепчены, но мало ли
logger.exception("Unhandled exception while taking snapshot")
finally:
self.__snapshoting = False
await notifier.notify()
async def __wakeup(self) -> None:
logger = get_logger(0)
if self.__wakeup_key:
logger.info("Waking up using key %r ...", self.__wakeup_key)
self.__hid.send_key_events([
(self.__wakeup_key, True),
(self.__wakeup_key, False),
])
if self.__wakeup_move:
logger.info("Waking up using mouse move for %d units ...", self.__wakeup_move)
for (to_x, to_y) in [(0, 0), (self.__wakeup_move, self.__wakeup_move), (0, 0)]:
self.__hid.send_mouse_move_event(to_x, to_y)
if self.__online_delay:
logger.info("Waiting %.2f seconds for online ...", self.__online_delay)
await asyncio.sleep(self.__online_delay)
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