158 lines
5.3 KiB
Python
158 lines
5.3 KiB
Python
"""FastAPI application factory."""
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from loguru import logger
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from contextlib import asynccontextmanager
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from fastapi import FastAPI
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from fastapi.middleware.cors import CORSMiddleware
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from fastapi.middleware.trustedhost import TrustedHostMiddleware
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from fastapi.responses import JSONResponse
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from fastapi.exceptions import RequestValidationError
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from starlette.exceptions import HTTPException as StarletteHTTPException
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from .config import Settings
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from .middleware import UserContextMiddleware
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from ..api.routes import router
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from ..api.endpoints import table_metadata
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@asynccontextmanager
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async def lifespan(app: FastAPI):
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"""Application lifespan manager."""
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logger.info("Starting up TH Agenter application...")
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yield
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logger.info("Shutting down TH Agenter application...")
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# def create_app(settings: Settings = None) -> FastAPI:
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# """Create and configure FastAPI application."""
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# if settings is None:
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# from .config import get_settings
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# settings = get_settings()
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# # Create FastAPI app
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# app = FastAPI(
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# title=settings.app_name,
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# version=settings.app_version,
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# description="基于Vue的第一个聊天智能体应用，使用FastAPI后端，由DrGraph修改",
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# debug=settings.debug,
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# lifespan=lifespan,
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# )
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# # Add middleware
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# setup_middleware(app, settings)
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# # Add exception handlers
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# setup_exception_handlers(app)
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# # Include routers
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# app.include_router(router, prefix="/api")
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# app.include_router(table_metadata.router)
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# # 在现有导入中添加
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# from ..api.endpoints import database_config
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# # 在路由注册部分添加
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# app.include_router(database_config.router)
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# # Health check endpoint
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# @app.get("/health")
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# async def health_check():
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# return {"status": "healthy", "version": settings.app_version}
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# # Root endpoint
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# @app.get("/")
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# async def root():
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# return {"message": "Chat Agent API is running"}
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# return app
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def setup_middleware(app: FastAPI, settings: Settings) -> None:
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"""Setup application middleware."""
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# User context middleware (should be first to set context for all requests)
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app.add_middleware(UserContextMiddleware)
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# CORS middleware
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app.add_middleware(
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CORSMiddleware,
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allow_origins=settings.cors.allowed_origins,
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allow_credentials=True,
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allow_methods=settings.cors.allowed_methods,
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allow_headers=settings.cors.allowed_headers,
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)
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# Trusted host middleware (for production)
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if settings.environment == "production":
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app.add_middleware(
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TrustedHostMiddleware,
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allowed_hosts=["*"] # Configure this properly in production
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)
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def setup_exception_handlers(app: FastAPI) -> None:
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"""Setup global exception handlers."""
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@app.exception_handler(StarletteHTTPException)
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async def http_exception_handler(request, exc):
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return JSONResponse(
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status_code=exc.status_code,
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content={
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"error": {
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"type": "http_error",
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"message": exc.detail,
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"status_code": exc.status_code
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}
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}
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)
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def make_json_serializable(obj):
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"""递归地将对象转换为JSON可序列化的格式"""
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if obj is None or isinstance(obj, (str, int, float, bool)):
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return obj
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elif isinstance(obj, bytes):
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return obj.decode('utf-8')
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elif isinstance(obj, (ValueError, Exception)):
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return str(obj)
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elif isinstance(obj, dict):
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return {k: make_json_serializable(v) for k, v in obj.items()}
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elif isinstance(obj, (list, tuple)):
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return [make_json_serializable(item) for item in obj]
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else:
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# For any other object, convert to string
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return str(obj)
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@app.exception_handler(RequestValidationError)
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async def validation_exception_handler(request, exc):
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# Convert any non-serializable objects to strings in error details
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try:
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errors = make_json_serializable(exc.errors())
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except Exception as e:
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# Fallback: if even our conversion fails, use a simple error message
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errors = [{"type": "serialization_error", "msg": f"Error processing validation details: {str(e)}"}]
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return JSONResponse(
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status_code=422,
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content={
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"error": {
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"type": "validation_error",
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"message": "Request validation failed",
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"details": errors
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}
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}
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)
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@app.exception_handler(Exception)
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async def general_exception_handler(request, exc):
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logger.error(f"Unhandled exception: {exc}", exc_info=True)
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return JSONResponse(
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status_code=500,
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content={
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"error": {
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"type": "internal_error",
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"message": "Internal server error"
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}
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}
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)
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# Create the app instance
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# app = create_app() |