72 lines
2.1 KiB
Python
72 lines
2.1 KiB
Python
from datetime import datetime
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import os
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from sqlalchemy import DateTime, func
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from sqlalchemy.ext.asyncio import AsyncAttrs, async_sessionmaker, create_async_engine
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from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
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from sqlalchemy.pool import NullPool
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from app.config import settings
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def _is_celery_process() -> bool:
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argv = " ".join(os.sys.argv).lower()
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return "celery" in argv
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engine_kwargs = {
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"echo": settings.DEBUG,
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"pool_pre_ping": True,
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}
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# SQLite 本地调试时不要乱塞 pool_size/max_overflow，PostgreSQL/asyncpg 才建议配置。
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# 默认保持 Celery 连接池复用；只有显式开启 CELERY_DB_USE_NULLPOOL=true 时才降级 NullPool。
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if _is_celery_process() and not settings.DATABASE_URL.startswith("sqlite"):
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if bool(getattr(settings, "CELERY_DB_USE_NULLPOOL", False)):
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engine_kwargs.update(poolclass=NullPool)
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else:
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engine_kwargs.update(
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pool_size=settings.CELERY_DB_POOL_SIZE,
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max_overflow=settings.CELERY_DB_MAX_OVERFLOW,
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pool_timeout=settings.CELERY_DB_POOL_TIMEOUT,
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pool_recycle=settings.CELERY_DB_POOL_RECYCLE,
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)
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engine = create_async_engine(settings.DATABASE_URL, **engine_kwargs)
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async_session = async_sessionmaker(
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engine,
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expire_on_commit=False,
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autoflush=False,
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)
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AsyncSessionLocal = async_session
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class Base(AsyncAttrs, DeclarativeBase):
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pass
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class TimestampMixin:
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created_at: Mapped[datetime] = mapped_column(
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DateTime(timezone=True), server_default=func.now(), comment="创建时间"
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)
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updated_at: Mapped[datetime] = mapped_column(
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DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), comment="更新时间"
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)
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class SoftDeleteMixin:
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deleted_at: Mapped[datetime | None] = mapped_column(
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DateTime(timezone=True), nullable=True, index=True, comment="软删除时间，NULL表示未删除"
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)
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async def init_database() -> None:
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async with engine.begin() as conn:
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await conn.run_sync(Base.metadata.create_all)
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async def close_database() -> None:
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await engine.dispose()
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