114 lines
3.1 KiB
Python
114 lines
3.1 KiB
Python
import dataclasses
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import fcntl
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import json
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import os
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from pydantic import ValidationError
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from pydantic.dataclasses import dataclass
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from pydantic.tools import parse_obj_as
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from mdrsclient.models import Laboratories, Token, User
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from mdrsclient.settings import CONFIG_DIR_PATH
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@dataclass
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class CacheData:
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user: User | None
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token: Token | None
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laboratories: Laboratories
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class CacheFile:
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serial: int
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cache_dir: str
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cache_file: str
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data: CacheData
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def __init__(self, remote: str) -> None:
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self.serial = -1
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self.cache_dir = os.path.join(CONFIG_DIR_PATH, "cache")
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self.cache_file = os.path.join(self.cache_dir, remote + ".json")
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self.data = CacheData(user=None, token=None, laboratories=Laboratories([]))
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def dump(self) -> CacheData | None:
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self.__load()
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return self.data
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@property
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def token(self) -> Token | None:
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self.__load()
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return self.data.token
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@token.setter
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def token(self, token: Token) -> None:
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self.__load()
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self.data.token = token
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self.__save()
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@token.deleter
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def token(self) -> None:
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if self.data.token is not None:
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self.__clear()
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@property
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def user(self) -> User | None:
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return self.data.user
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@user.setter
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def user(self, user: User) -> None:
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self.__load()
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self.data.user = user
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self.__save()
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@user.deleter
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def user(self) -> None:
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if self.data.user is not None:
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self.__clear()
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@property
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def laboratories(self) -> Laboratories:
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return self.data.laboratories
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@laboratories.setter
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def laboratories(self, laboratories: Laboratories) -> None:
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self.__load()
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self.data.laboratories = laboratories
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self.__save()
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def __clear(self) -> None:
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self.data.user = None
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self.data.token = None
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self.data.laboratories.clear()
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self.__save()
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def __load(self) -> None:
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if os.path.isfile(self.cache_file):
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stat = os.stat(self.cache_file)
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serial = hash((stat.st_uid, stat.st_gid, stat.st_mode, stat.st_size, stat.st_mtime))
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if self.serial != serial:
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try:
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with open(self.cache_file) as f:
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self.data = parse_obj_as(CacheData, json.load(f))
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except ValidationError:
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self.__clear()
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self.__save()
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else:
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self.serial = serial
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else:
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self.data.token = None
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self.serial = -1
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def __save(self) -> None:
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self.__ensure_cache_dir()
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with open(self.cache_file, "w") as f:
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fcntl.flock(f, fcntl.LOCK_EX)
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f.write(json.dumps(dataclasses.asdict(self.data)))
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# ensure file is secure.
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os.chmod(self.cache_file, 0o600)
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def __ensure_cache_dir(self) -> None:
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if not os.path.exists(self.cache_dir):
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os.makedirs(self.cache_dir)
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# ensure directory is secure.
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os.chmod(self.cache_dir, 0o700)
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