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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2020 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 contextlib
import struct
from typing import Callable
from typing import AsyncGenerator
import aiohttp
from .. import aiotools
from .. import htclient
from .. import htserver
from . import BaseHttpClient
from . import BaseHttpClientSession
# =====
class _BaseApiPart:
def __init__(self, ensure_http_session: Callable[[], aiohttp.ClientSession]) -> None:
self._ensure_http_session = ensure_http_session
async def _set_params(self, handle: str, **params: (int | str | None)) -> None:
session = self._ensure_http_session()
async with session.post(
url=handle,
params={
key: value
for (key, value) in params.items()
if value is not None
},
) as response:
htclient.raise_not_200(response)
class _AuthApiPart(_BaseApiPart):
async def check(self) -> bool:
session = self._ensure_http_session()
try:
async with session.get("/auth/check") as response:
htclient.raise_not_200(response)
return True
except aiohttp.ClientResponseError as ex:
if ex.status in [400, 401, 403]:
return False
raise
class _StreamerApiPart(_BaseApiPart):
async def get_state(self) -> dict:
session = self._ensure_http_session()
async with session.get("/streamer") as response:
htclient.raise_not_200(response)
return (await response.json())["result"]
async def set_params(self, quality: (int | None)=None, desired_fps: (int | None)=None) -> None:
await self._set_params(
"/streamer/set_params",
quality=quality,
desired_fps=desired_fps,
)
class _HidApiPart(_BaseApiPart):
async def get_keymaps(self) -> tuple[str, set[str]]:
session = self._ensure_http_session()
async with session.get("/hid/keymaps") as response:
htclient.raise_not_200(response)
result = (await response.json())["result"]
return (result["keymaps"]["default"], set(result["keymaps"]["available"]))
async def print(self, text: str, limit: int, keymap_name: str) -> None:
session = self._ensure_http_session()
async with session.post(
url="/hid/print",
params={"limit": limit, "keymap": keymap_name},
data=text,
) as response:
htclient.raise_not_200(response)
async def set_params(self, keyboard_output: (str | None)=None, mouse_output: (str | None)=None) -> None:
await self._set_params(
"/hid/set_params",
keyboard_output=keyboard_output,
mouse_output=mouse_output,
)
class _AtxApiPart(_BaseApiPart):
async def get_state(self) -> dict:
session = self._ensure_http_session()
async with session.get("/atx") as response:
htclient.raise_not_200(response)
return (await response.json())["result"]
async def switch_power(self, action: str) -> bool:
session = self._ensure_http_session()
try:
async with session.post(
url="/atx/power",
params={"action": action},
) as response:
htclient.raise_not_200(response)
return True
except aiohttp.ClientResponseError as ex:
if ex.status == 409:
return False
raise
# =====
class KvmdClientWs:
def __init__(self, ws: aiohttp.ClientWebSocketResponse) -> None:
self.__ws = ws
self.__writer_queue: "asyncio.Queue[tuple[str, dict] | bytes]" = asyncio.Queue()
self.__communicated = False
async def communicate(self) -> AsyncGenerator[tuple[str, dict], None]: # pylint: disable=too-many-branches
assert not self.__communicated
self.__communicated = True
receive_task: (asyncio.Task | None) = None
writer_task: (asyncio.Task | None) = None
try:
while True:
if receive_task is None:
receive_task = asyncio.create_task(self.__ws.receive())
if writer_task is None:
writer_task = asyncio.create_task(self.__writer_queue.get())
done = (await aiotools.wait_first(receive_task, writer_task))[0]
if receive_task in done:
msg = receive_task.result()
if msg.type == aiohttp.WSMsgType.TEXT:
yield htserver.parse_ws_event(msg.data)
elif msg.type == aiohttp.WSMsgType.CLOSE:
await self.__ws.close()
elif msg.type == aiohttp.WSMsgType.CLOSED:
break
else:
raise RuntimeError(f"Unhandled WS message type: {msg!r}")
receive_task = None
if writer_task in done:
payload = writer_task.result()
if isinstance(payload, bytes):
await self.__ws.send_bytes(payload)
else:
await htserver.send_ws_event(self.__ws, *payload)
writer_task = None
finally:
if receive_task:
receive_task.cancel()
if writer_task:
writer_task.cancel()
try:
await aiotools.shield_fg(self.__ws.close())
except Exception:
pass
finally:
self.__communicated = False
async def send_key_event(self, key: str, state: bool) -> None:
await self.__writer_queue.put(bytes([1, state]) + key.encode("ascii"))
async def send_mouse_button_event(self, button: str, state: bool) -> None:
await self.__writer_queue.put(bytes([2, state]) + button.encode("ascii"))
async def send_mouse_move_event(self, to_x: int, to_y: int) -> None:
await self.__writer_queue.put(struct.pack(">bhh", 3, to_x, to_y))
async def send_mouse_wheel_event(self, delta_x: int, delta_y: int) -> None:
await self.__writer_queue.put(struct.pack(">bbbb", 5, 0, delta_x, delta_y))
class KvmdClientSession(BaseHttpClientSession):
def __init__(self, make_http_session: Callable[[], aiohttp.ClientSession]) -> None:
super().__init__(make_http_session)
self.auth = _AuthApiPart(self._ensure_http_session)
self.streamer = _StreamerApiPart(self._ensure_http_session)
self.hid = _HidApiPart(self._ensure_http_session)
self.atx = _AtxApiPart(self._ensure_http_session)
@contextlib.asynccontextmanager
async def ws(self) -> AsyncGenerator[KvmdClientWs, None]:
session = self._ensure_http_session()
async with session.ws_connect("/ws", params={"legacy": "0"}) as ws:
yield KvmdClientWs(ws)
class KvmdClient(BaseHttpClient):
def make_session(self, user: str="", passwd: str="") -> KvmdClientSession:
headers = {
"X-KVMD-User": user,
"X-KVMD-Passwd": passwd,
}
return KvmdClientSession(lambda: self._make_http_session(headers))
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