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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 dataclasses
from ....logging import get_logger
# =====
@dataclasses.dataclass(frozen=True)
class Image:
name: str
path: str
complete: bool = dataclasses.field(compare=False)
in_storage: bool = dataclasses.field(compare=False)
size: int = dataclasses.field(default=0, compare=False)
mod_ts: float = dataclasses.field(default=0, compare=False)
def exists(self) -> bool:
return os.path.exists(self.path)
def __post_init__(self) -> None:
try:
st = os.stat(self.path)
except Exception:
pass
else:
object.__setattr__(self, "size", st.st_size)
object.__setattr__(self, "mod_ts", st.st_mtime)
@dataclasses.dataclass(frozen=True)
class StorageSpace:
size: int
free: int
class Storage:
def __init__(self, path: str) -> None:
self.__path = path
self.__images_path = os.path.join(self.__path, "images")
self.__meta_path = os.path.join(self.__path, "meta")
def get_watchable_paths(self) -> list[str]:
return [self.__images_path, self.__meta_path]
def get_images(self) -> dict[str, Image]:
return {
name: self.get_image_by_name(name)
for name in os.listdir(self.__images_path)
}
def get_image_by_name(self, name: str) -> Image:
assert name
path = os.path.join(self.__images_path, name)
return self.__get_image(name, path)
def get_image_by_path(self, path: str) -> Image:
assert path
name = os.path.basename(path)
return self.__get_image(name, path)
def __get_image(self, name: str, path: str) -> Image:
assert name
assert path
complete = True
in_storage = (os.path.dirname(path) == self.__images_path)
if in_storage:
complete = os.path.exists(os.path.join(self.__meta_path, name + ".complete"))
return Image(name, path, complete, in_storage)
def remove_image(self, image: Image, fatal: bool) -> None:
assert image.in_storage
try:
os.remove(image.path)
except FileNotFoundError:
pass
except Exception:
if fatal:
raise
self.set_image_complete(image, False)
def set_image_complete(self, image: Image, flag: bool) -> None:
assert image.in_storage
path = os.path.join(self.__meta_path, image.name + ".complete")
if flag:
open(path, "w").close() # pylint: disable=consider-using-with
else:
try:
os.remove(path)
except FileNotFoundError:
pass
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),
)
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