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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 contextlib
import types
from typing import Callable
from typing import Awaitable
from typing import Generator
from typing import AsyncGenerator
import aiohttp
import ustreamer
from .. import tools
from .. import aiotools
from .. import htclient
# =====
class StreamerError(Exception):
pass
class StreamerTempError(StreamerError):
pass
class StreamerPermError(StreamerError):
pass
# =====
class StreamFormats:
JPEG = 1195724874 # V4L2_PIX_FMT_JPEG
H264 = 875967048 # V4L2_PIX_FMT_H264
_MJPEG = 1196444237 # V4L2_PIX_FMT_MJPEG
class BaseStreamerClient:
def get_format(self) -> int:
raise NotImplementedError()
@contextlib.asynccontextmanager
async def reading(self) -> AsyncGenerator[Callable[[bool], Awaitable[dict]], None]:
if self is not None: # XXX: Vulture and pylint hack
raise NotImplementedError()
yield
# =====
@contextlib.contextmanager
def _http_handle_errors() -> Generator[None, None, None]:
try:
yield
except Exception as err: # Тут бывают и ассерты, и KeyError, и прочая херня
if isinstance(err, StreamerTempError):
raise
raise StreamerTempError(tools.efmt(err))
class HttpStreamerClient(BaseStreamerClient):
def __init__(
self,
name: str,
unix_path: str,
timeout: float,
user_agent: str,
) -> None:
self.__name = name
self.__unix_path = unix_path
self.__timeout = timeout
self.__user_agent = user_agent
def get_format(self) -> int:
return StreamFormats.JPEG
@contextlib.asynccontextmanager
async def reading(self) -> AsyncGenerator[Callable[[bool], Awaitable[dict]], None]:
with _http_handle_errors():
async with self.__make_http_session() as session:
async with session.get(
url=self.__make_url("stream"),
params={"extra_headers": "1"},
) as response:
htclient.raise_not_200(response)
reader = aiohttp.MultipartReader.from_response(response)
self.__patch_stream_reader(reader.resp.content)
async def read_frame(key_required: bool) -> dict:
_ = key_required
with _http_handle_errors():
frame = await reader.next() # pylint: disable=not-callable
if not isinstance(frame, aiohttp.BodyPartReader):
raise StreamerTempError("Expected body part")
data = bytes(await frame.read())
if not data:
raise StreamerTempError("Reached EOF")
return {
"online": (frame.headers["X-UStreamer-Online"] == "true"),
"width": int(frame.headers["X-UStreamer-Width"]),
"height": int(frame.headers["X-UStreamer-Height"]),
"data": data,
"format": StreamFormats.JPEG,
}
yield read_frame
def __make_http_session(self) -> aiohttp.ClientSession:
kwargs: dict = {
"headers": {"User-Agent": self.__user_agent},
"connector": aiohttp.UnixConnector(path=self.__unix_path),
"timeout": aiohttp.ClientTimeout(
connect=self.__timeout,
sock_read=self.__timeout,
),
}
return aiohttp.ClientSession(**kwargs)
def __make_url(self, handle: str) -> str:
assert not handle.startswith("/"), handle
return f"http://localhost:0/{handle}"
def __patch_stream_reader(self, reader: aiohttp.StreamReader) -> None:
# https://github.com/pikvm/pikvm/issues/92
# Infinite looping in BodyPartReader.read() because _at_eof flag.
orig_read = reader.read
async def read(self: aiohttp.StreamReader, n: int=-1) -> bytes: # pylint: disable=invalid-name
if self.is_eof():
raise StreamerTempError("StreamReader.read(): Reached EOF")
return (await orig_read(n))
reader.read = types.MethodType(read, reader) # type: ignore
def __str__(self) -> str:
return f"HttpStreamerClient({self.__name})"
# =====
@contextlib.contextmanager
def _memsink_handle_errors() -> Generator[None, None, None]:
try:
yield
except StreamerPermError:
raise
except FileNotFoundError as err:
raise StreamerTempError(tools.efmt(err))
except Exception as err:
raise StreamerPermError(tools.efmt(err))
class MemsinkStreamerClient(BaseStreamerClient):
def __init__(
self,
name: str,
fmt: int,
obj: str,
lock_timeout: float,
wait_timeout: float,
drop_same_frames: float,
) -> None:
self.__name = name
self.__fmt = fmt
self.__kwargs: dict = {
"obj": obj,
"lock_timeout": lock_timeout,
"wait_timeout": wait_timeout,
"drop_same_frames": drop_same_frames,
}
def get_format(self) -> int:
return self.__fmt
@contextlib.asynccontextmanager
async def reading(self) -> AsyncGenerator[Callable[[bool], Awaitable[dict]], None]:
with _memsink_handle_errors():
with ustreamer.Memsink(**self.__kwargs) as sink:
async def read_frame(key_required: bool) -> dict:
key_required = (key_required and self.__fmt == StreamFormats.H264)
with _memsink_handle_errors():
while True:
frame = await aiotools.run_async(sink.wait_frame, key_required)
if frame is not None:
self.__check_format(frame["format"])
return frame
yield read_frame
def __check_format(self, fmt: int) -> None:
if fmt == StreamFormats._MJPEG: # pylint: disable=protected-access
fmt = StreamFormats.JPEG
if fmt != self.__fmt:
raise StreamerPermError("Invalid sink format")
def __str__(self) -> str:
return f"MemsinkStreamerClient({self.__name})"
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