106 lines
2.7 KiB
Python
106 lines
2.7 KiB
Python
from __future__ import annotations
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from collections.abc import AsyncIterator, Callable
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from contextlib import asynccontextmanager
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from contextvars import ContextVar
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from datetime import datetime
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import json
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from typing import Annotated
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from app.config import settings
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from fastapi import Depends
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from pydantic import BaseModel
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import redis as sync_redis
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import redis.asyncio as redis
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from sqlalchemy.ext.asyncio import create_async_engine
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from sqlmodel import SQLModel
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from sqlmodel.ext.asyncio.session import AsyncSession
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def json_serializer(value):
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if isinstance(value, BaseModel | SQLModel):
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return value.model_dump_json()
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elif isinstance(value, datetime):
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return value.isoformat()
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return json.dumps(value)
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# 数据库引擎
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engine = create_async_engine(
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settings.database_url,
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json_serializer=json_serializer,
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pool_size=30, # 增加连接池大小
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max_overflow=50, # 增加最大溢出连接数
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pool_timeout=30.0,
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pool_recycle=3600, # 1小时回收连接
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pool_pre_ping=True, # 启用连接预检查
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)
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# Redis 连接
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redis_client = redis.from_url(settings.redis_url, decode_responses=True)
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# Redis 二进制数据连接 (不自动解码响应，用于存储音频等二进制数据)
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redis_binary_client = redis.from_url(settings.redis_url, decode_responses=False)
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# Redis 消息缓存连接 (db1) - 使用同步客户端在线程池中执行
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redis_message_client = sync_redis.from_url(settings.redis_url, decode_responses=True, db=1)
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# 数据库依赖
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db_session_context: ContextVar[AsyncSession | None] = ContextVar("db_session_context", default=None)
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async def get_db():
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session = db_session_context.get()
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if session is None:
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session = AsyncSession(engine)
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db_session_context.set(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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db_session_context.set(None)
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else:
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yield session
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@asynccontextmanager
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async def with_db():
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async with AsyncSession(engine) 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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DBFactory = Callable[[], AsyncIterator[AsyncSession]]
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Database = Annotated[AsyncSession, Depends(get_db)]
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async def get_db_factory() -> DBFactory:
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async def _factory() -> AsyncIterator[AsyncSession]:
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async with AsyncSession(engine) as session:
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yield session
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return _factory
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# Redis 依赖
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def get_redis():
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return redis_client
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def get_redis_binary():
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"""获取二进制数据专用的 Redis 客户端 (不自动解码响应)"""
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return redis_binary_client
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def get_redis_message():
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"""获取消息专用的 Redis 客户端 (db1)"""
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return redis_message_client
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def get_redis_pubsub():
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return redis_client.pubsub()
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