72 lines
2.3 KiB
Python
72 lines
2.3 KiB
Python
from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
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from sqlalchemy.orm import sessionmaker
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from config import settings
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from utils.logger import session_logger
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import asyncio
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import urllib.parse
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class DatabaseManager:
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_instance = None
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_lock = asyncio.Lock()
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def __init__(self):
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self.engine = None
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self.async_session = None
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self._initialized = False
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@classmethod
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async def get_instance(cls):
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async with cls._lock:
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if cls._instance is None:
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cls._instance = DatabaseManager()
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if not cls._instance._initialized:
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await cls._instance.initialize()
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return cls._instance
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async def initialize(self):
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if self._initialized:
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return
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try:
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encoded_password = urllib.parse.quote_plus(settings.db_password)
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connection_string = f"mysql+aiomysql://{settings.db_user}:{encoded_password}@{settings.db_host}:{settings.db_port}/{settings.db_name}?charset=utf8mb4"
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self.engine = create_async_engine(
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connection_string,
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echo=settings.db_echo,
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pool_pre_ping=True,
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pool_recycle=3600,
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)
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self.async_session = sessionmaker(
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self.engine, expire_on_commit=False, class_=AsyncSession
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)
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self._initialized = True
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session_logger.info("system", "database", f"数据库连接初始化成功: {settings.db_host}:{settings.db_port}/{settings.db_name}")
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except Exception as e:
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session_logger.error("system", "database", f"数据库连接初始化失败: {str(e)}")
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raise
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async def get_session(self):
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"""获取数据库会话"""
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if not self._initialized:
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await self.initialize()
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return self.async_session()
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async def close(self):
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"""关闭数据库连接"""
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if self.engine:
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await self.engine.dispose()
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self._initialized = False
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session_logger.info("system", "database", "数据库连接已关闭")
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db_manager = None
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async def get_db_manager():
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global db_manager
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if db_manager is None:
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db_manager = await DatabaseManager.get_instance()
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return db_manager
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