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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 os
import contextlib
from typing import AsyncGenerator
import aiohttp
from .. import htclient
from .. import htserver
# =====
class PstError(Exception):
pass
# =====
class PstClient:
def __init__(
self,
subdir: str,
unix_path: str,
timeout: float,
user_agent: str,
) -> None:
self.__subdir = subdir
self.__unix_path = unix_path
self.__timeout = timeout
self.__user_agent = user_agent
async def get_path(self) -> str:
async with self.__make_http_session() as session:
async with session.get("http://localhost:0/state") as resp:
htclient.raise_not_200(resp)
path = (await resp.json())["result"]["data"]["path"]
return os.path.join(path, self.__subdir)
@contextlib.asynccontextmanager
async def writable(self) -> AsyncGenerator[str, None]:
async with self.__inner_writable() as path:
path = os.path.join(path, self.__subdir)
if not os.path.exists(path):
os.mkdir(path)
yield path
@contextlib.asynccontextmanager
async def __inner_writable(self) -> AsyncGenerator[str, None]:
async with self.__make_http_session() as session:
async with session.ws_connect("http://localhost:0/ws") as ws:
path = ""
async for msg in ws:
if msg.type != aiohttp.WSMsgType.TEXT:
raise PstError(f"Unexpected message type: {msg!r}")
(event_type, event) = htserver.parse_ws_event(msg.data)
if event_type == "storage_state":
if not event["data"]["write_allowed"]:
raise PstError("Write is not allowed")
path = event["data"]["path"]
break
if not path:
raise PstError("WS loop broken without write_allowed=True flag")
# TODO: Actually we should follow ws events, but for fast writing we can safely ignore them
yield path
def __make_http_session(self) -> aiohttp.ClientSession:
return aiohttp.ClientSession(
headers={"User-Agent": self.__user_agent},
connector=aiohttp.UnixConnector(path=self.__unix_path),
timeout=aiohttp.ClientTimeout(total=self.__timeout),
)
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