fullfill graphql usertype; change db session to dep injection

auth/oauth/google.py

@@ -8,8 +8,9 @@ import secrets
 import json
 from urllib.parse import quote
 from dotenv import load_dotenv
+from sqlalchemy.orm import Session
 
-from app.db import SessionLocal
+from app.db import SessionLocal, get_db
 from app.models import User
 from auth.tokens import create_jwt_token, create_refresh_token, decode_token
 from app.utils.format import get_image_url
@@ -94,7 +95,13 @@ def login_google():
     return response
 
 @router.get("/auth/callback")
-async def auth_callback(request: Request, code: str, state: str, background_tasks: BackgroundTasks):
+async def auth_callback(
+    request: Request,
+    code: str,
+    state: str,
+    background_tasks: BackgroundTasks,
+    db: Session = Depends(get_db)
+):
     cookie_state = request.cookies.get("oauth_state")
 
     if not cookie_state or cookie_state != state:
@@ -121,10 +128,7 @@ async def auth_callback(request: Request, code: str, state: str, background_task
         )
 
         user_info = user_res.json()
-
-    db = SessionLocal()
     
-    try:
         user = db.query(User).filter(User.email == user_info["email"]).first()
 
         if not user:
@@ -166,8 +170,6 @@ async def auth_callback(request: Request, code: str, state: str, background_task
             
             # 这里不需要再次 refresh，除非后面还要用到更新后的 user 对象
             # db.refresh(user)
-    finally:
-        db.close()
 
     jwt_token = create_jwt_token({
         "sub": user.id,