82 lines
2.0 KiB
Python
82 lines
2.0 KiB
Python
import json
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import logging
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from typing import AsyncGenerator
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from contextlib import asynccontextmanager
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from fastapi import FastAPI, HTTPException, Depends
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from fastapi.middleware.cors import CORSMiddleware
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from fastapi.responses import StreamingResponse
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from google.adk.runners import Runner
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from google.adk.agents.run_config import RunConfig, StreamingMode
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from google.genai import types
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from app.config import settings
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from app.services import (
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get_session_service,
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init_session_service,
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close_session_service
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)
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from app.agent_factory import create_agent
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# Routers
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from app.routers.agents import router as agents_router
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from app.routers.sessions import router as sessions_router
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from app.routers.tools import router as tools_router
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# --- Logging Configuration ---
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# --- Logging Configuration ---
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logging.basicConfig(
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level=logging.INFO,
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format="%(asctime)s - %(name)s - %(levelname)s - %(message)s"
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)
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logger = logging.getLogger(__name__)
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# --- Application Lifespan ---
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@asynccontextmanager
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async def lifespan(app: FastAPI):
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"""Application lifespan manager for startup/shutdown events."""
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logger.info("Starting up ADK Chat Backend...")
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await init_session_service()
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logger.info("Application started successfully")
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yield
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logger.info("Shutting down ADK Chat Backend...")
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await close_session_service()
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logger.info("Application shutdown complete")
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app = FastAPI(
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title="ADK Enterprise Chat Backend",
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description="LLM Chat backend powered by Google ADK with PostgreSQL persistence",
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version="2.0.0",
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lifespan=lifespan
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)
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# --- CORS Configuration ---
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app.add_middleware(
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CORSMiddleware,
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allow_origins=["*"],
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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)
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# --- Register Routers ---
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app.include_router(agents_router)
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app.include_router(sessions_router)
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app.include_router(tools_router)
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# --- Helper ---
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def get_streaming_mode(mode_str: str) -> StreamingMode:
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return StreamingMode.SSE if mode_str.lower() == "sse" else StreamingMode.NONE
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