fastapi - 从 main.py 导入配置

Question

我是 fastapi 的新手，到目前为止它确实很棒，但我很难找到一种干净的方法将我的应用程序配置导入到另一个模块中。

编辑：我需要能够在运行单元测试时更改配置

这是我的目录树：

/app
| __init__.py
| /router
| | __init__.py
| | my_router.py
| /test
| | test_api.py
| config.py
| main.py

这是我的main.py文件：

from functools import lru_cache

from fastapi import FastAPI

from .router import my_router
from . import config

app = FastAPI()

app.include_router(
    my_router.router,
    prefix="/r",
    tags=["my-router"],
)


@lru_cache()
def get_setting():
    return config.Settings(admin_email="admin@domain.com")


@app.get('/')
def hello():
    return 'Hello world'

这里是router.py：

from fastapi import APIRouter

from ..main import get_setting

router = APIRouter()

@router.get('/test')
def get_param_list(user_id: int):
    config = get_setting()
    return 'Import Ok'

这是配置文件

from pydantic import BaseSettings


class Settings(BaseSettings):
    param_folder: str = "param"
    result_folder: str = "output"

    class Config:
        env_prefix = "APP_"

然后运行uvicorn app.main:app --reload我得到：ERROR: Error loading ASGI app. Could not import module "app.main". 我猜是因为一种循环导入。但我不知道如何将我的配置传递到我的路由器？

感谢您的帮助 ：）

Answer 1

如何直接在config.py.

from functools import lru_cache
from pydantic import BaseSettings


class Settings(BaseSettings):
    admin_email: str = "admin@example.com"
    param_folder: str = "param"
    result_folder: str = "output"

    class Config:
        env_prefix = "APP_"

@lru_cache()
def get_setting():
    return Settings()

和my_router.py

from fastapi import APIRouter, Depends

from ..config import Settings, get_setting

router = APIRouter()

@router.get('/test')
def get_param_list(config: Settings = Depends(get_setting)):
    return config

和test.py

from fastapi.testclient import TestClient

from . import config, main

client = TestClient(main.app)


def get_settings_override():
    return config.Settings(admin_email="testing_admin@example.com")


main.app.dependency_overrides[config.get_settings] = get_settings_override

def test_app():
    response = client.get("/r/test")
    data = response.json()
    assert data == config.Settings(admin_email="testing_admin@example.com")