我正在构建一个浏览器游戏,其中每个用户都有 4 种类型的资源,并且每个用户根据其农场的级别生产更多资源。
我想做的是,每当给定用户登录时,我想在他们刷新页面或执行任何操作时重新计算其当前资源。
中间件似乎是实现我目标的正确工具,但我对当前架构(多个路由器)的实现有点困惑。在执行任何其他 API 调用之前调用函数来执行资源重新计算的最简洁方法是什么?
这是我到目前为止所尝试过的(示例中间件):
app.py(无中间件):
from fastapi import FastAPI, Depends, Request
from src.api.v1.village import village_router
from src.api.v1.auth import auth_router
from src.api.v1.admin import admin_router
from src.core.auth import get_current_user
from src.core.config import *
def create_app() -> FastAPI:
root_app = FastAPI()
root_app.include_router(
auth_router,
prefix="/api/v1",
tags=["auth"],
)
root_app.include_router(
admin_router,
prefix="/api/v1",
tags=["admin"],
dependencies=[Depends(get_current_user)],
)
root_app.include_router(
village_router,
prefix="/api/v1",
tags=["village"],
)
return root_app
然后我添加了一个
helloworld
中间件,并将 get_current_user
添加为依赖项,因为用户必须登录才能执行计算。
app.py(带有中间件):
from fastapi import FastAPI, Depends, Request
from src.api.v1.village import village_router
from src.api.v1.auth import auth_router
from src.api.v1.admin import admin_router
from src.core.auth import get_current_user
from src.core.config import *
import time
def create_app() -> FastAPI:
root_app = FastAPI()
root_app.include_router(
auth_router,
prefix="/api/v1",
tags=["auth"],
)
root_app.include_router(
admin_router,
prefix="/api/v1",
tags=["admin"],
dependencies=[Depends(get_current_user)],
)
root_app.include_router(
village_router,
prefix="/api/v1",
tags=["village"],
)
@root_app.middleware("http")
async def add_process_time_header(
request: Request, call_next, current_user=Depends(get_current_user)
):
start_time = time.time()
response = await call_next(request)
process_time = time.time() - start_time
response.headers["X-Process-Time"] = str(process_time)
print("middleware call")
return response
return root_app
似乎依赖项被忽略,因为即使我没有登录,中间件也会被调用,而我的 protected_routes 则不是这种情况(如果我没有登录,我的路线上会收到 401 错误)。
async def get_current_user(
session=Depends(get_db), token: str = Depends(oauth2_scheme)
) -> UserAuth:
try:
payload = jwt.decode(token, SECRET_KEY, algorithms=[AUTH_TOKEN_ALGO])
email: str = payload.get("email")
user_id: str = payload.get("user_id")
if email is None:
raise ValueError("A very specific bad thing happened.")
token_data = UserJWTToken(user_id=user_id, email=email)
except jwt.PyJWTError:
raise ValueError("A very specific bad thing happened.")
user = get_user_by_email(session, token_data.email)
if user is None:
raise ValueError("A very specific bad thing happened.")
return user
您可以使用全局依赖项。这是一个在这种情况下可能对您有所帮助的示例
from fastapi import Depends, FastAPI, Request
def get_db_session():
print("Calling 'get_db_session(...)'")
return "Some Value"
def get_current_user(session=Depends(get_db_session)):
print("Calling 'get_current_user(...)'")
return session
def recalculate_resources(request: Request, current_user=Depends(get_current_user)):
print("calling 'recalculate_resources(...)'")
request.state.foo = current_user
app = FastAPI(dependencies=[Depends(recalculate_resources)])
@app.get("/")
async def root(request: Request):
return {"foo_from_dependency": request.state.foo}