编写后端

backend/main.py

@@ -1,6 +1,72 @@
+"""
+FastAPI 应用入口
+"""
+from contextlib import asynccontextmanager
 from fastapi import FastAPI
-from pydantic import BaseModel
-app = FastAPI()
-@app.get("/")
-def read_root():
-    return {"Hello": "World"}
+from fastapi.middleware.cors import CORSMiddleware
+
+from app.core.config import settings
+from app.core.database import init_db, close_db
+from app.core.logger import app_logger
+from app.api.api import api_router
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    """应用生命周期管理"""
+    # 启动时
+    app_logger.info(f"Starting {settings.APP_NAME} v{settings.APP_VERSION}...")
+
+    # 初始化数据库
+    await init_db()
+
+    yield
+
+    # 关闭时
+    app_logger.info("Shutting down...")
+    await close_db()
+
+
+def create_app() -> FastAPI:
+    """创建 FastAPI 应用"""
+    app = FastAPI(
+        title=settings.APP_NAME,
+        version=settings.APP_VERSION,
+        description="ACG 风格博客系统 API",
+        docs_url="/docs",
+        redoc_url="/redoc",
+        lifespan=lifespan
+    )
+
+    # 配置 CORS
+    app.add_middleware(
+        CORSMiddleware,
+        allow_origins=settings.BACKEND_CORS_ORIGINS,
+        allow_credentials=True,
+        allow_methods=["*"],
+        allow_headers=["*"],
+    )
+
+    # 注册路由
+    app.include_router(api_router)
+
+    # 健康检查
+    @app.get("/health")
+    async def health_check():
+        return {"status": "healthy", "app": settings.APP_NAME}
+
+    return app
+
+
+app = create_app()
+
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run(
+        "main:app",
+        host="0.0.0.0",
+        port=8000,
+        reload=True,
+        log_level="info"
+    )