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import json
import logging
import os
from typing import Any, Dict, Optional
from uaclient import defaults, event_logger, exceptions, system, util
event = event_logger.get_event_logger()
LOG = logging.getLogger(util.replace_top_level_logger_name(__name__))
class UAFile:
def __init__(
self,
name: str,
directory: str = defaults.DEFAULT_DATA_DIR,
private: bool = True,
):
self._directory = directory
self._file_name = name
self._is_private = private
self._path = os.path.join(self._directory, self._file_name)
@property
def path(self) -> str:
return self._path
@property
def is_private(self) -> bool:
return self._is_private
@property
def is_present(self):
return os.path.exists(self.path)
def write(self, content: str):
file_mode = (
defaults.ROOT_READABLE_MODE
if self.is_private
else defaults.WORLD_READABLE_MODE
)
# try/except-ing here avoids race conditions the best
try:
if os.path.basename(self._directory) == defaults.PRIVATE_SUBDIR:
os.makedirs(self._directory, mode=0o700)
else:
os.makedirs(self._directory)
except OSError:
pass
system.write_file(self.path, content, file_mode)
def read(self) -> Optional[str]:
content = None
try:
content = system.load_file(self.path)
except FileNotFoundError:
LOG.debug("Tried to load %s but file does not exist", self.path)
return content
def delete(self):
system.ensure_file_absent(self.path)
class ProJSONFile:
def __init__(
self,
pro_file: UAFile,
):
self.pro_file = pro_file
def write(self, content: Dict[str, Any]):
self.pro_file.write(
content=json.dumps(content, cls=util.DatetimeAwareJSONEncoder)
)
def read(self) -> Optional[Dict[str, Any]]:
content = self.pro_file.read()
if content:
try:
return json.loads(content, cls=util.DatetimeAwareJSONDecoder)
except json.JSONDecodeError as e:
raise exceptions.InvalidJson(
source=self.pro_file.path, out="\n" + str(e)
)
return None
def delete(self):
return self.pro_file.delete()
@property
def is_present(self):
return self.pro_file.is_present
class UserCacheFile(UAFile):
def __init__(self, name: str):
super().__init__(
name, directory=system.get_user_cache_dir(), private=False
)