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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 types
from typing import Dict
from typing import AsyncGenerator
import aiohttp
try:
import ustreamer
except ImportError:
ustreamer = None
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()
async def read_stream(self) -> AsyncGenerator[Dict, None]:
if self is not None: # XXX: Vulture and pylint hack
raise NotImplementedError()
yield
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
async def read_stream(self) -> AsyncGenerator[Dict, None]:
try:
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)
while True:
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:
break
yield {
"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,
}
except Exception as err: # Тут бывают и ассерты, и KeyError, и прочая херня
if isinstance(err, StreamerTempError):
raise
raise StreamerTempError(tools.efmt(err))
raise StreamerTempError("Reached EOF")
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})"
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
async def read_stream(self) -> AsyncGenerator[Dict, None]:
if ustreamer is None:
raise StreamerPermError("Missing ustreamer library")
try:
with ustreamer.Memsink(**self.__kwargs) as sink:
while True:
frame = await aiotools.run_async(sink.wait_frame)
if frame is not None:
self.__check_format(frame["format"])
yield frame
except StreamerPermError:
raise
except FileNotFoundError as err:
raise StreamerTempError(tools.efmt(err))
except Exception as err:
raise StreamerPermError(tools.efmt(err))
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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