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"""
Base service class with common functionality.
"""
import os
import shutil
import tempfile
from pathlib import Path
from typing import Any, Optional
from .constants import LOCAL_LIB, LOCAL_SHARE_BASE, VULKAN_LAYER_DIR, SCRIPT_NAME
class BaseService:
"""Base service class with common functionality"""
def __init__(self, logger: Optional[Any] = None):
"""Initialize base service
Args:
logger: Logger instance, defaults to decky.logger if None
"""
if logger is None:
import decky
self.log = decky.logger
else:
self.log = logger
# Initialize common paths using pathlib
self.user_home = Path.home()
self.local_lib_dir = self.user_home / LOCAL_LIB
self.local_share_dir = self.user_home / VULKAN_LAYER_DIR
self.lsfg_script_path = self.user_home / SCRIPT_NAME
def _ensure_directories(self) -> None:
"""Create necessary directories if they don't exist"""
self.local_lib_dir.mkdir(parents=True, exist_ok=True)
self.local_share_dir.mkdir(parents=True, exist_ok=True)
self.log.info(f"Ensured directories exist: {self.local_lib_dir}, {self.local_share_dir}")
def _remove_if_exists(self, path: Path) -> bool:
"""Remove a file if it exists
Args:
path: Path to the file to remove
Returns:
True if file was removed, False if it didn't exist
Raises:
OSError: If removal fails
"""
if path.exists():
try:
path.unlink()
self.log.info(f"Removed {path}")
return True
except OSError as e:
self.log.error(f"Failed to remove {path}: {e}")
raise
else:
self.log.info(f"File not found: {path}")
return False
def _atomic_write(self, path: Path, content: str, mode: int = 0o644) -> None:
"""Write content to a file atomically
Args:
path: Target file path
content: Content to write
mode: File permissions (default: 0o644)
Raises:
OSError: If write fails
"""
# Create temporary file in the same directory to ensure atomic move
temp_path = None
try:
with tempfile.NamedTemporaryFile(
mode='w',
dir=path.parent,
delete=False,
prefix=f'.{path.name}.',
suffix='.tmp'
) as temp_file:
temp_file.write(content)
temp_path = Path(temp_file.name)
# Set permissions before moving
temp_path.chmod(mode)
# Atomic move
temp_path.replace(path)
self.log.info(f"Atomically wrote to {path}")
except Exception:
# Clean up temp file if something went wrong
if temp_path and temp_path.exists():
try:
temp_path.unlink()
except OSError:
pass # Best effort cleanup
raise
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