356 lines
11 KiB
Python
356 lines
11 KiB
Python
"""
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EU-Utility - Data Store Service
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Thread-safe persistent data storage for plugins.
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Provides file locking, auto-backup, and singleton access.
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"""
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import json
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import shutil
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import threading
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import platform
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from pathlib import Path
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from typing import Any, Dict, Optional
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from datetime import datetime
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from collections import OrderedDict
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# Cross-platform file locking
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try:
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import fcntl # Unix/Linux/Mac
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HAS_FCNTL = True
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except ImportError:
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HAS_FCNTL = False
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# Windows fallback using portalocker or threading lock
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try:
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import portalocker
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HAS_PORTALOCKER = True
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except ImportError:
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HAS_PORTALOCKER = False
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class DataStore:
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"""
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Singleton data persistence service for plugins.
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Features:
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- Thread-safe file operations with file locking
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- Auto-backup on write (keeps last 5 versions)
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- Per-plugin JSON storage
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- Auto-create directories
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"""
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_instance = None
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_lock = threading.Lock()
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def __new__(cls):
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if cls._instance is None:
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with cls._lock:
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if cls._instance is None:
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cls._instance = super().__new__(cls)
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cls._instance._initialized = False
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return cls._instance
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def __init__(self, data_dir: str = "data/plugins"):
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if self._initialized:
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return
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self.data_dir = Path(data_dir)
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self.data_dir.mkdir(parents=True, exist_ok=True)
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# Memory cache for frequently accessed data
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self._cache: Dict[str, Dict[str, Any]] = {}
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self._cache_lock = threading.Lock()
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# Backup settings
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self.max_backups = 5
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self._initialized = True
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def _get_plugin_file(self, plugin_id: str) -> Path:
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"""Get the storage file path for a plugin."""
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# Sanitize plugin_id to create a safe filename
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safe_name = plugin_id.replace(".", "_").replace("/", "_").replace("\\", "_")
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return self.data_dir / f"{safe_name}.json"
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def _get_backup_dir(self, plugin_id: str) -> Path:
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"""Get the backup directory for a plugin."""
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safe_name = plugin_id.replace(".", "_").replace("/", "_").replace("\\", "_")
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backup_dir = self.data_dir / ".backups" / safe_name
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backup_dir.mkdir(parents=True, exist_ok=True)
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return backup_dir
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def _load_plugin_data(self, plugin_id: str) -> Dict[str, Any]:
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"""Load all data for a plugin from disk."""
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# Check cache first
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with self._cache_lock:
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if plugin_id in self._cache:
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return self._cache[plugin_id].copy()
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file_path = self._get_plugin_file(plugin_id)
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if not file_path.exists():
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return {}
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try:
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with open(file_path, 'r', encoding='utf-8') as f:
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# Cross-platform file locking
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self._lock_file(f, exclusive=False)
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try:
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data = json.load(f)
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finally:
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self._unlock_file(f)
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# Update cache
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with self._cache_lock:
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self._cache[plugin_id] = data.copy()
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return data
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except (json.JSONDecodeError, IOError) as e:
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print(f"[DataStore] Error loading data for {plugin_id}: {e}")
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return {}
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def _save_plugin_data(self, plugin_id: str, data: Dict[str, Any]) -> bool:
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"""Save all data for a plugin to disk with backup."""
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file_path = self._get_plugin_file(plugin_id)
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try:
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# Create backup if file exists
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if file_path.exists():
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self._create_backup(plugin_id, file_path)
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# Write to temp file first, then move (atomic operation)
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temp_path = file_path.with_suffix('.tmp')
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with open(temp_path, 'w', encoding='utf-8') as f:
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# Cross-platform file locking
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self._lock_file(f, exclusive=True)
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try:
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json.dump(data, f, indent=2, ensure_ascii=False)
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f.flush()
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import os
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os.fsync(f.fileno())
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finally:
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self._unlock_file(f)
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# Atomic move
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temp_path.replace(file_path)
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# Update cache
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with self._cache_lock:
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self._cache[plugin_id] = data.copy()
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return True
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except IOError as e:
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print(f"[DataStore] Error saving data for {plugin_id}: {e}")
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# Clean up temp file if exists
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temp_path = file_path.with_suffix('.tmp')
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if temp_path.exists():
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temp_path.unlink()
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return False
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def _lock_file(self, f, exclusive: bool = False):
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"""Cross-platform file locking."""
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if HAS_FCNTL:
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# Unix/Linux/Mac
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lock_type = fcntl.LOCK_EX if exclusive else fcntl.LOCK_SH
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fcntl.flock(f.fileno(), lock_type)
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elif HAS_PORTALOCKER:
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# Windows with portalocker
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import portalocker
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lock_type = portalocker.LOCK_EX if exclusive else portalocker.LOCK_SH
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portalocker.lock(f, lock_type)
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else:
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# Fallback: rely on threading lock (already held)
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pass
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def _unlock_file(self, f):
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"""Cross-platform file unlock."""
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if HAS_FCNTL:
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fcntl.flock(f.fileno(), fcntl.LOCK_UN)
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elif HAS_PORTALOCKER:
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import portalocker
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portalocker.unlock(f)
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else:
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# Fallback: nothing to do
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pass
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def _create_backup(self, plugin_id: str, file_path: Path):
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"""Create a backup of the current data file."""
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backup_dir = self._get_backup_dir(plugin_id)
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timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
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backup_path = backup_dir / f"{timestamp}.json"
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try:
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shutil.copy2(file_path, backup_path)
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self._cleanup_old_backups(backup_dir)
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except IOError as e:
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print(f"[DataStore] Error creating backup for {plugin_id}: {e}")
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def _cleanup_old_backups(self, backup_dir: Path):
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"""Remove old backups, keeping only the last N versions."""
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try:
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backups = sorted(backup_dir.glob("*.json"), key=lambda p: p.stat().st_mtime)
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while len(backups) > self.max_backups:
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old_backup = backups.pop(0)
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old_backup.unlink()
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except IOError as e:
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print(f"[DataStore] Error cleaning up backups: {e}")
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def save(self, plugin_id: str, key: str, data: Any) -> bool:
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"""
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Save data for a plugin.
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Args:
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plugin_id: Unique identifier for the plugin
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key: Key under which to store the data
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data: Data to store (must be JSON serializable)
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Returns:
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True if successful, False otherwise
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"""
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plugin_data = self._load_plugin_data(plugin_id)
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plugin_data[key] = data
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return self._save_plugin_data(plugin_id, plugin_data)
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def load(self, plugin_id: str, key: str, default: Any = None) -> Any:
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"""
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Load data for a plugin.
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Args:
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plugin_id: Unique identifier for the plugin
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key: Key of the data to load
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default: Default value if key not found
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Returns:
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The stored data or default value
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"""
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plugin_data = self._load_plugin_data(plugin_id)
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return plugin_data.get(key, default)
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def delete(self, plugin_id: str, key: str) -> bool:
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"""
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Delete data for a plugin.
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Args:
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plugin_id: Unique identifier for the plugin
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key: Key of the data to delete
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Returns:
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True if key existed and was deleted, False otherwise
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"""
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plugin_data = self._load_plugin_data(plugin_id)
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if key in plugin_data:
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del plugin_data[key]
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return self._save_plugin_data(plugin_id, plugin_data)
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return False
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def get_all_keys(self, plugin_id: str) -> list:
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"""
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Get all keys stored for a plugin.
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Args:
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plugin_id: Unique identifier for the plugin
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Returns:
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List of keys
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"""
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plugin_data = self._load_plugin_data(plugin_id)
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return list(plugin_data.keys())
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def clear_plugin(self, plugin_id: str) -> bool:
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"""
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Clear all data for a plugin.
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Args:
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plugin_id: Unique identifier for the plugin
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Returns:
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True if successful, False otherwise
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"""
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file_path = self._get_plugin_file(plugin_id)
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# Create backup before clearing
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if file_path.exists():
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self._create_backup(plugin_id, file_path)
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# Clear cache
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with self._cache_lock:
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if plugin_id in self._cache:
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del self._cache[plugin_id]
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# Remove file
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try:
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if file_path.exists():
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file_path.unlink()
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return True
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except IOError as e:
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print(f"[DataStore] Error clearing data for {plugin_id}: {e}")
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return False
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def get_backups(self, plugin_id: str) -> list:
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"""
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Get list of available backups for a plugin.
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Args:
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plugin_id: Unique identifier for the plugin
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Returns:
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List of backup file paths
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"""
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backup_dir = self._get_backup_dir(plugin_id)
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if not backup_dir.exists():
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return []
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backups = sorted(backup_dir.glob("*.json"), key=lambda p: p.stat().st_mtime, reverse=True)
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return [str(b) for b in backups]
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def restore_backup(self, plugin_id: str, backup_path: str) -> bool:
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"""
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Restore data from a backup.
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Args:
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plugin_id: Unique identifier for the plugin
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backup_path: Path to the backup file
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Returns:
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True if successful, False otherwise
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"""
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backup_file = Path(backup_path)
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if not backup_file.exists():
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print(f"[DataStore] Backup not found: {backup_path}")
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return False
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file_path = self._get_plugin_file(plugin_id)
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try:
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# Create backup of current state before restoring
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if file_path.exists():
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self._create_backup(plugin_id, file_path)
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# Copy backup to main file
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shutil.copy2(backup_file, file_path)
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# Invalidate cache
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with self._cache_lock:
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if plugin_id in self._cache:
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del self._cache[plugin_id]
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return True
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except IOError as e:
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print(f"[DataStore] Error restoring backup for {plugin_id}: {e}")
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return False
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# Singleton instance
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_data_store = None
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_data_store_lock = threading.Lock()
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def get_data_store() -> DataStore:
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"""Get the global DataStore instance."""
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global _data_store
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if _data_store is None:
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with _data_store_lock:
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if _data_store is None:
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_data_store = DataStore()
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return _data_store
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