smart-question-bank/SERVER/app/logger/logging.py

import sys
from pathlib import Path
from loguru import logger as _logger
from ..config import config


class Logger:
    """单例日志类"""
    _instance = None
    _logger_id = None  # 用于存储logger id以便重新配置

    def __new__(cls):
        if cls._instance is None:
            cls._instance = super().__new__(cls)
            cls._instance._initialized = False
            cls._instance._logger = _logger
            cls._instance._setup()
        return cls._instance

    def _remove_existing_handlers(self):
        """移除现有的日志处理器"""
        if self._logger_id is not None:
            self._logger.remove(self._logger_id)
            self._logger_id = None

    def _setup(self):
        """私有方法：初始化日志配置"""
        try:
            # 移除所有默认处理器
            self._logger.remove()
            self._remove_existing_handlers()

            # 创建日志目录
            log_dir = Path(config.logging.path)
            log_dir.mkdir(parents=True, exist_ok=True)
            log_file = log_dir / config.logging.file

            # 配置日志
            self._logger_id = self._logger.add(
                log_file.with_stem(f"{log_file.stem}_{{time:YYYY-MM-DD}}"),
                rotation="1 day",  # 每天滚动日志
                retention=f"{config.logging.retention_days} days",
                level=config.logging.level,
                format=config.logging.format,
                encoding="utf-8",
                enqueue=True,  # 线程安全
                compression="zip"  # 压缩旧日志
            )

            # 使用用户配置的控制台输出
            if config.logging.console_format:
                self._logger.add(sys.stdout,
                                 level=config.logging.level,
                                 format=config.logging.console_format)

        except Exception as e:
            self._logger.error(f"日志配置初始化失败: {str(e)}")
            raise


# 创建全局单例实例
logger = Logger()._logger