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#!/usr/bin/env python3
"""
Configuration Manager with Hot Reload
======================================
مدیریت فایلهای پیکربندی با قابلیت reload خودکار در صورت تغییر
"""
import json
import logging
from pathlib import Path
from typing import Dict, Any, Optional, Callable
from datetime import datetime
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler, FileModifiedEvent
import threading
import time
logger = logging.getLogger(__name__)
class ConfigFileHandler(FileSystemEventHandler):
"""Handler for config file changes."""
def __init__(self, config_manager: 'ConfigManager'):
"""
Initialize config file handler.
Args:
config_manager: Reference to ConfigManager instance
"""
self.config_manager = config_manager
self.last_modified = {}
def on_modified(self, event: FileModifiedEvent):
"""Handle file modification event."""
if event.is_directory:
return
file_path = Path(event.src_path)
# Check if this is a config file we're watching
if file_path in self.config_manager.config_files:
# Prevent multiple reloads for the same file
current_time = time.time()
last_time = self.last_modified.get(file_path, 0)
# Debounce: ignore if modified within last 2 seconds
if current_time - last_time < 2.0:
return
self.last_modified[file_path] = current_time
logger.info(f"Config file modified: {file_path}")
self.config_manager.reload_config(file_path)
class ConfigManager:
"""Manager for configuration files with hot reload support."""
def __init__(self, config_dir: str = "config"):
"""
Initialize configuration manager.
Args:
config_dir: Directory containing config files
"""
self.config_dir = Path(config_dir)
self.configs: Dict[str, Dict[str, Any]] = {}
self.config_files: Dict[Path, str] = {}
self.observers: Dict[str, Observer] = {}
self.reload_callbacks: Dict[str, list] = {}
self.lock = threading.Lock()
# Define config files to watch
self._setup_config_files()
# Load initial configs
self.load_all_configs()
# Start file watchers
self.start_watching()
def _setup_config_files(self):
"""Setup config file paths."""
self.config_files = {
self.config_dir / "scoring.config.json": "scoring",
self.config_dir / "strategy.config.json": "strategy"
}
def load_config(self, config_name: str) -> Optional[Dict[str, Any]]:
"""
Load a configuration file.
Args:
config_name: Name of the config (e.g., "scoring", "strategy")
Returns:
Config dictionary or None if not found
"""
config_path = None
for path, name in self.config_files.items():
if name == config_name:
config_path = path
break
if not config_path or not config_path.exists():
logger.warning(f"Config file not found: {config_name}")
return None
try:
with open(config_path, 'r', encoding='utf-8') as f:
config = json.load(f)
with self.lock:
self.configs[config_name] = config
logger.info(f"Loaded config: {config_name}")
return config
except Exception as e:
logger.error(f"Error loading config {config_name}: {e}", exc_info=True)
return None
def load_all_configs(self):
"""Load all configuration files."""
logger.info("Loading all configuration files...")
for config_path, config_name in self.config_files.items():
self.load_config(config_name)
logger.info(f"Loaded {len(self.configs)} configuration files")
def reload_config(self, config_path: Path):
"""
Reload a specific configuration file.
Args:
config_path: Path to the config file
"""
if config_path not in self.config_files:
return
config_name = self.config_files[config_path]
logger.info(f"Reloading config: {config_name}")
old_config = self.configs.get(config_name)
new_config = self.load_config(config_name)
if new_config and new_config != old_config:
logger.info(f"Config {config_name} reloaded successfully")
# Call registered callbacks
if config_name in self.reload_callbacks:
for callback in self.reload_callbacks[config_name]:
try:
callback(new_config, old_config)
except Exception as e:
logger.error(f"Error in reload callback: {e}", exc_info=True)
def get_config(self, config_name: str) -> Optional[Dict[str, Any]]:
"""
Get a configuration by name.
Args:
config_name: Name of the config
Returns:
Config dictionary or None
"""
with self.lock:
return self.configs.get(config_name)
def register_reload_callback(
self,
config_name: str,
callback: Callable[[Dict[str, Any], Optional[Dict[str, Any]]], None]
):
"""
Register a callback to be called when config is reloaded.
Args:
config_name: Name of the config
callback: Callback function (new_config, old_config) -> None
"""
if config_name not in self.reload_callbacks:
self.reload_callbacks[config_name] = []
self.reload_callbacks[config_name].append(callback)
logger.info(f"Registered reload callback for {config_name}")
def start_watching(self):
"""Start watching config files for changes."""
if not self.config_dir.exists():
logger.warning(f"Config directory does not exist: {self.config_dir}")
return
event_handler = ConfigFileHandler(self)
# Create observer for each config file's directory
watched_dirs = set(path.parent for path in self.config_files.keys())
for watch_dir in watched_dirs:
observer = Observer()
observer.schedule(event_handler, str(watch_dir), recursive=False)
observer.start()
self.observers[str(watch_dir)] = observer
logger.info(f"Started watching directory: {watch_dir}")
def stop_watching(self):
"""Stop watching config files."""
for observer in self.observers.values():
observer.stop()
observer.join()
self.observers.clear()
logger.info("Stopped watching config files")
def manual_reload(self, config_name: Optional[str] = None) -> Dict[str, Any]:
"""
Manually reload configuration files.
Args:
config_name: Optional specific config to reload (reloads all if None)
Returns:
Dict with reload status
"""
if config_name:
config_path = None
for path, name in self.config_files.items():
if name == config_name:
config_path = path
break
if config_path:
self.reload_config(config_path)
return {
"success": True,
"message": f"Config {config_name} reloaded",
"config": config_name
}
else:
return {
"success": False,
"message": f"Config {config_name} not found"
}
else:
# Reload all configs
for config_name in self.config_files.values():
self.load_config(config_name)
return {
"success": True,
"message": "All configs reloaded",
"configs": list(self.config_files.values())
}
def get_all_configs(self) -> Dict[str, Dict[str, Any]]:
"""Get all loaded configurations."""
with self.lock:
return self.configs.copy()
# Global config manager instance
_config_manager: Optional[ConfigManager] = None
def get_config_manager(config_dir: str = "config") -> ConfigManager:
"""
Get or create global config manager instance.
Args:
config_dir: Config directory path
Returns:
ConfigManager instance
"""
global _config_manager
if _config_manager is None:
_config_manager = ConfigManager(config_dir)
return _config_manager
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