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# ========================================================================== #
# #
# KVMD - The main PiKVM daemon. #
# #
# Copyright (C) 2018-2022 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 asyncio
import operator
import dataclasses
from typing import Generator
from typing import Optional
import aiofiles
import aiofiles.os
from ....logging import get_logger
from .... import aiotools
from .... import aiohelpers
from .. import MsdError
# =====
@dataclasses.dataclass(frozen=True)
class _Image:
name: str
path: str
in_storage: bool = dataclasses.field(init=False, compare=False)
complete: bool = dataclasses.field(init=False, compare=False)
removable: bool = dataclasses.field(init=False, compare=False)
size: int = dataclasses.field(init=False, compare=False)
mod_ts: float = dataclasses.field(init=False, compare=False)
class Image(_Image):
def __init__(self, name: str, path: str, storage: Optional["Storage"]) -> None:
super().__init__(name, path)
self.__storage = storage
(self.__dir_path, file_name) = os.path.split(path)
self.__complete_path = os.path.join(self.__dir_path, f".__{file_name}.complete")
self.__adopted = False
async def _update(self) -> None:
# adopted используется в последующих проверках
self.__adopted = await aiotools.run_async(self.__is_adopted)
(complete, removable, (size, mod_ts)) = await asyncio.gather(
self.__is_complete(),
self.__is_removable(),
self.__get_stat(),
)
object.__setattr__(self, "complete", complete)
object.__setattr__(self, "removable", removable)
object.__setattr__(self, "size", size)
object.__setattr__(self, "mod_ts", mod_ts)
def __is_adopted(self) -> bool:
# True, если образ находится вне хранилища
# или в другой точке монтирования под ним
if self.__storage is None:
return True
path = self.path
while not os.path.ismount(path):
path = os.path.dirname(path)
return (self.__storage._get_root_path() != path)
async def __is_complete(self) -> bool:
if self.__storage:
return (await aiofiles.os.path.exists(self.__complete_path))
return True
async def __is_removable(self) -> bool:
if not self.__storage:
return False
if not self.__adopted:
return True
return (await aiofiles.os.access(self.__dir_path, os.W_OK)) # type: ignore
async def __get_stat(self) -> tuple[int, float]:
try:
st = (await aiofiles.os.stat(self.path))
return (st.st_size, st.st_mtime)
except Exception:
return (0, 0.0)
# =====
@property
def in_storage(self) -> bool:
return bool(self.__storage)
async def exists(self) -> bool:
return (await aiofiles.os.path.exists(self.path))
async def remount_rw(self, rw: bool, fatal: bool=True) -> None:
assert self.__storage
if not self.__adopted:
await self.__storage.remount_rw(rw, fatal)
async def remove(self, fatal: bool) -> None:
assert self.__storage
try:
await aiofiles.os.remove(self.path)
except FileNotFoundError:
pass
except Exception:
if fatal:
raise
await self.set_complete(False)
async def set_complete(self, flag: bool) -> None:
assert self.__storage
if flag:
async with aiofiles.open(self.__complete_path, "w"):
pass
else:
try:
await aiofiles.os.remove(self.__complete_path)
except FileNotFoundError:
pass
await self._update()
@dataclasses.dataclass(frozen=True)
class StorageSpace:
size: int
free: int
class Storage:
def __init__(self, path: str, remount_cmd: list[str]) -> None:
self.__path = path
self.__remount_cmd = remount_cmd
def _get_root_path(self) -> str:
return self.__path
async def get_watchable_paths(self) -> list[str]:
return (await aiotools.run_async(self.__inner_get_watchable_paths))
async def get_images(self) -> dict[str, Image]:
return {
name: (await self.make_image_by_name(name))
for name in (await aiotools.run_async(self.__inner_get_images))
}
def __inner_get_watchable_paths(self) -> list[str]:
return list(map(operator.itemgetter(0), self.__walk(with_files=False)))
def __inner_get_images(self) -> list[str]:
return [
os.path.relpath(path, self.__path) # == name
for (_, files) in self.__walk(with_files=True)
for path in files
]
def __walk(self, with_files: bool, root_path: (str | None)=None) -> Generator[tuple[str, list[str]], None, None]:
if root_path is None:
root_path = self.__path
files: list[str] = []
with os.scandir(root_path) as dir_iter:
for item in sorted(dir_iter, key=operator.attrgetter("name")):
if item.name.startswith(".") or item.name == "lost+found":
continue
try:
if item.is_dir(follow_symlinks=False):
item.stat() # Проверяем, не сдохла ли смонтированная NFS
yield from self.__walk(with_files, item.path)
elif with_files and item.is_file(follow_symlinks=False):
files.append(item.path)
except Exception:
pass
yield (root_path, files)
# =====
async def make_image_by_name(self, name: str) -> Image:
assert name
path = os.path.join(self.__path, name)
return (await self.__get_image(name, path, True))
async def make_image_by_path(self, path: str) -> Image:
assert path
in_storage = (os.path.commonpath([self.__path, path]) == self.__path)
if in_storage:
name = os.path.relpath(path, self.__path)
else:
name = os.path.basename(path)
return (await self.__get_image(name, path, in_storage))
async def __get_image(self, name: str, path: str, in_storage: bool) -> Image:
assert name
assert path
image = Image(name, path, (self if in_storage else None))
await image._update() # pylint: disable=protected-access
return image
# =====
def get_space(self, fatal: bool) -> (StorageSpace | None):
try:
st = os.statvfs(self.__path)
except Exception as err:
if fatal:
raise
get_logger().warning("Can't get free space of filesystem %s: %s", self.__path, err)
return None
return StorageSpace(
size=(st.f_blocks * st.f_frsize),
free=(st.f_bavail * st.f_frsize),
)
async def remount_rw(self, rw: bool, fatal: bool=True) -> None:
if not (await aiohelpers.remount("MSD", self.__remount_cmd, rw)):
if fatal:
raise MsdError("Can't execute remount helper")
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