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https://github.com/fawney19/Aether.git
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383 lines
12 KiB
Python
383 lines
12 KiB
Python
"""
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数据库连接和初始化
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"""
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import time
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from typing import AsyncGenerator, Generator, Optional
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from sqlalchemy import create_engine, event
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from sqlalchemy.engine import Engine
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from sqlalchemy.ext.asyncio import (
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AsyncEngine,
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AsyncSession,
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async_sessionmaker,
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create_async_engine,
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)
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from sqlalchemy.orm import Session, sessionmaker
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from sqlalchemy.pool import Pool, QueuePool
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from ..config import config
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from src.core.logger import logger
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from ..models.database import Base, SystemConfig, User, UserRole
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# 延迟初始化的数据库引擎和会话工厂
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_engine: Optional[Engine] = None
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_SessionLocal: Optional[sessionmaker] = None
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_async_engine: Optional[AsyncEngine] = None
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_AsyncSessionLocal: Optional[async_sessionmaker] = None
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# 连接池监控
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_last_pool_warning: float = 0.0
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POOL_WARNING_INTERVAL = 60 # 每60秒最多警告一次
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def _setup_pool_monitoring(engine: Engine):
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"""设置连接池监控事件"""
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@event.listens_for(engine, "connect")
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def receive_connect(dbapi_conn, connection_record):
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"""连接创建时的监控"""
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pass
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@event.listens_for(engine, "checkout")
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def receive_checkout(dbapi_conn, connection_record, connection_proxy):
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"""从连接池检出连接时的监控"""
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global _last_pool_warning
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pool = engine.pool
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# 获取连接池状态
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checked_out = pool.checkedout()
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pool_size = pool.size()
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overflow = pool.overflow()
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max_capacity = config.db_pool_size + config.db_max_overflow
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# 计算使用率
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usage_rate = (checked_out / max_capacity) * 100 if max_capacity > 0 else 0
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# 如果使用率超过阈值，发出警告
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if usage_rate >= config.db_pool_warn_threshold:
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current_time = time.time()
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# 避免频繁警告
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if current_time - _last_pool_warning > POOL_WARNING_INTERVAL:
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_last_pool_warning = current_time
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logger.warning(
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f"数据库连接池使用率过高: checked_out={checked_out}, "
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f"pool_size={pool_size}, overflow={overflow}, "
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f"max_capacity={max_capacity}, usage_rate={usage_rate:.1f}%, "
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f"threshold={config.db_pool_warn_threshold}%"
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)
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def get_pool_status() -> dict:
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"""获取连接池状态"""
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engine = _ensure_engine()
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pool = engine.pool
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return {
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"checked_out": pool.checkedout(),
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"pool_size": pool.size(),
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"overflow": pool.overflow(),
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"max_capacity": config.db_pool_size + config.db_max_overflow,
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"pool_timeout": config.db_pool_timeout,
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}
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def log_pool_status():
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"""记录连接池状态到日志（用于监控）"""
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try:
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status = get_pool_status()
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usage_rate = (
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(status["checked_out"] / status["max_capacity"] * 100)
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if status["max_capacity"] > 0
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else 0
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)
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logger.info(
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f"数据库连接池状态: checked_out={status['checked_out']}, "
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f"pool_size={status['pool_size']}, overflow={status['overflow']}, "
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f"max_capacity={status['max_capacity']}, usage_rate={usage_rate:.1f}%"
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)
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except Exception as e:
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logger.error(f"获取连接池状态失败: {e}")
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def _ensure_engine() -> Engine:
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"""
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确保数据库引擎已创建（延迟加载）
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这允许测试和 CLI 工具在导入模块时不会立即连接数据库
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"""
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global _engine, _SessionLocal
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if _engine is not None:
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return _engine
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# 获取数据库配置
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DATABASE_URL = config.database_url
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# 验证数据库类型（生产环境要求 PostgreSQL，但允许测试环境使用其他数据库）
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is_production = config.environment == "production"
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if is_production and not DATABASE_URL.startswith("postgresql://"):
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raise ValueError("生产环境只支持 PostgreSQL 数据库，请配置正确的 DATABASE_URL")
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# 创建引擎
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_engine = create_engine(
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DATABASE_URL,
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poolclass=QueuePool, # 使用队列连接池
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pool_size=config.db_pool_size, # 连接池大小
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max_overflow=config.db_max_overflow, # 最大溢出连接数
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pool_timeout=config.db_pool_timeout, # 连接超时（秒）
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pool_recycle=config.db_pool_recycle, # 连接回收时间（秒）
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pool_pre_ping=True, # 检查连接活性
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echo=False, # 关闭SQL日志输出（太冗长）
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)
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# 设置连接池监控
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_setup_pool_monitoring(_engine)
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# 创建会话工厂
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_SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=_engine)
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_log_pool_capacity()
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logger.debug(f"数据库引擎已初始化: {DATABASE_URL.split('@')[-1] if '@' in DATABASE_URL else 'local'}")
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return _engine
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def _log_pool_capacity():
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theoretical = config.db_pool_size + config.db_max_overflow
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workers = max(1, config.worker_processes)
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total_estimated = theoretical * workers
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logger.info("数据库连接池配置")
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if total_estimated > config.db_pool_warn_threshold:
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logger.warning("数据库连接需求可能超过阈值，请调小池大小或减少 worker 数")
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def _ensure_async_engine() -> AsyncEngine:
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"""
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确保异步数据库引擎已创建（延迟加载）
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这允许异步路由使用非阻塞的数据库访问
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"""
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global _async_engine, _AsyncSessionLocal
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if _async_engine is not None:
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return _async_engine
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# 获取数据库配置并转换为异步URL
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DATABASE_URL = config.database_url
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# 转换同步URL为异步URL（postgresql:// -> postgresql+asyncpg://）
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if DATABASE_URL.startswith("postgresql://"):
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ASYNC_DATABASE_URL = DATABASE_URL.replace("postgresql://", "postgresql+asyncpg://", 1)
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elif DATABASE_URL.startswith("sqlite:///"):
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ASYNC_DATABASE_URL = DATABASE_URL.replace("sqlite:///", "sqlite+aiosqlite:///", 1)
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else:
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raise ValueError(f"不支持的数据库类型: {DATABASE_URL}")
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# 验证数据库类型（生产环境要求 PostgreSQL）
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is_production = config.environment == "production"
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if is_production and not ASYNC_DATABASE_URL.startswith("postgresql+asyncpg://"):
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raise ValueError("生产环境只支持 PostgreSQL 数据库，请配置正确的 DATABASE_URL")
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# 创建异步引擎
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_async_engine = create_async_engine(
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ASYNC_DATABASE_URL,
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poolclass=QueuePool, # 使用队列连接池
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pool_size=config.db_pool_size,
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max_overflow=config.db_max_overflow,
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pool_timeout=config.db_pool_timeout,
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pool_recycle=config.db_pool_recycle,
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pool_pre_ping=True,
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echo=False,
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)
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# 创建异步会话工厂
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_AsyncSessionLocal = async_sessionmaker(
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_async_engine,
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class_=AsyncSession,
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expire_on_commit=False,
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autocommit=False,
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autoflush=False,
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)
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logger.debug(f"异步数据库引擎已初始化: {ASYNC_DATABASE_URL.split('@')[-1] if '@' in ASYNC_DATABASE_URL else 'local'}")
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return _async_engine
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async def get_async_db() -> AsyncGenerator[AsyncSession, None]:
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"""获取异步数据库会话"""
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# 确保异步引擎已初始化
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_ensure_async_engine()
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async with _AsyncSessionLocal() as session:
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try:
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yield session
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finally:
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await session.close()
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def get_db() -> Generator[Session, None, None]:
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"""获取数据库会话
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注意：事务管理由业务逻辑层显式控制（手动调用 commit/rollback）
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这里只负责会话的创建和关闭，不自动提交
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"""
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# 确保引擎已初始化
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_ensure_engine()
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db = _SessionLocal()
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try:
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yield db
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# 不再自动 commit，由业务代码显式管理事务
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except Exception:
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try:
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db.rollback() # 失败时回滚未提交的事务
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except Exception as rollback_error:
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# 记录回滚错误（可能是 commit 正在进行中）
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logger.debug(f"回滚事务时出错（可忽略）: {rollback_error}")
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raise
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finally:
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try:
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db.close() # 确保连接返回池
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except Exception as close_error:
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# 记录关闭错误（如 IllegalStateChangeError）
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# 连接池会处理连接的回收
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logger.debug(f"关闭数据库连接时出错（可忽略）: {close_error}")
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def create_session() -> Session:
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"""
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创建一个新的数据库会话
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注意：调用者必须负责关闭会话
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推荐在 with 语句中使用或手动调用 session.close()
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示例:
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db = create_session()
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try:
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# 使用 db
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finally:
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db.close()
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"""
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_ensure_engine()
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return _SessionLocal()
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def get_db_url() -> str:
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"""返回当前配置的数据库连接字符串（供脚本/测试使用）。"""
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return config.database_url
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def init_db():
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"""初始化数据库"""
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logger.info("初始化数据库...")
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# 确保引擎已创建
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engine = _ensure_engine()
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# 创建所有表
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Base.metadata.create_all(bind=engine)
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# 数据库表已通过SQLAlchemy自动创建
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db = _SessionLocal()
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try:
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# 创建管理员账户（如果环境变量中配置了）
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init_admin_user(db)
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# 添加默认模型配置
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init_default_models(db)
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# 添加系统配置
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init_system_configs(db)
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db.commit()
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logger.info("数据库初始化完成")
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except Exception as e:
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logger.error(f"数据库初始化失败: {e}")
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db.rollback()
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raise
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finally:
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db.close()
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def init_admin_user(db: Session):
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"""从环境变量创建管理员账户"""
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# 检查是否使用默认凭据
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if config.admin_email == "admin@localhost" and config.admin_password == "admin123":
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logger.warning("使用默认管理员账户配置，建议修改为安全的凭据")
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# 检查是否已存在管理员
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existing_admin = (
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db.query(User)
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.filter((User.email == config.admin_email) | (User.username == config.admin_username))
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.first()
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)
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if existing_admin:
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logger.info(f"管理员账户已存在: {existing_admin.email}")
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return
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try:
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# 创建管理员账户
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admin = User(
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email=config.admin_email,
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username=config.admin_username,
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role=UserRole.ADMIN,
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quota_usd=1000.0,
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is_active=True,
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)
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admin.set_password(config.admin_password)
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db.add(admin)
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db.commit() # 刷新以获取ID，但不提交
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logger.info(f"创建管理员账户成功: {admin.email} ({admin.username})")
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except Exception as e:
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logger.error(f"创建管理员账户失败: {e}")
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raise
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def init_default_models(db: Session):
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"""初始化默认模型配置"""
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# 注意：作为中转代理服务，不再预设模型配置
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# 模型配置应该通过 GlobalModel 和 Model 表动态管理
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# 这个函数保留用于未来可能的默认模型初始化
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pass
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def init_system_configs(db: Session):
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"""初始化系统配置"""
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configs = [
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{"key": "default_user_quota_usd", "value": 10.0, "description": "新用户默认美元配额"},
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{"key": "rate_limit_per_minute", "value": 60, "description": "每分钟请求限制"},
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{"key": "enable_registration", "value": False, "description": "是否开放用户注册"},
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{"key": "require_email_verification", "value": False, "description": "是否需要邮箱验证"},
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{"key": "api_key_expire_days", "value": 365, "description": "API密钥过期天数"},
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]
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for config_data in configs:
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existing = db.query(SystemConfig).filter_by(key=config_data["key"]).first()
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if not existing:
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config = SystemConfig(**config_data)
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db.add(config)
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logger.info(f"添加系统配置: {config_data['key']}")
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def reset_db():
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"""重置数据库（仅用于开发）"""
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logger.warning("重置数据库...")
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# 确保引擎已创建
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engine = _ensure_engine()
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Base.metadata.drop_all(bind=engine)
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init_db()
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