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[英]FastAPI cannot find main.py: `ERROR: Error loading ASGI app. Could not import module "main"
[英]fastapi - import config from main.py
我是 fastapi 的新手,到目前為止真的很棒,但我很難找到一種干凈的方法將我的應用程序配置導入另一個模塊。
編輯:我需要能夠在運行單元測試時更改配置
這是我的目錄樹:
/app
| __init__.py
| /router
| | __init__.py
| | my_router.py
| /test
| | test_api.py
| config.py
| main.py
這是我的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'
這是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'
這是配置文件
from pydantic import BaseSettings
class Settings(BaseSettings):
param_folder: str = "param"
result_folder: str = "output"
class Config:
env_prefix = "APP_"
然后運行uvicorn app.main:app --reload
我得到: ERROR: Error loading ASGI app. Could not import module "app.main".
ERROR: Error loading ASGI app. Could not import module "app.main".
我猜是因為一種循環導入。 但是我不知道如何將我的配置傳遞給我的路由器?
謝謝你的幫助:)
直接在config.py
中設置 lru 緩存怎么樣。
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")
我使用 FastAPI Dependency 系統讓它工作,並且按照@Kassym Dorsel 的建議,通過將 lru_cache 移動到config.py
。
唯一的缺點是我必須在每個需要設置的 function 調用中添加setting: config.Setting = Depends(config.get_setting)
,這非常“繁重”。
我是這樣做的:
config.py
文件:
from pydantic import BaseSettings
class Settings(BaseSettings):
param_folder: str = "param"
result_folder: str = "output"
class Config:
env_prefix = "APP_"
@lru_cache()
def get_setting():
return config.Settings(admin_email="admin@domain.com")
main.py
文件:
from functools import lru_cache
from fastapi import FastAPI
from .router import my_router
app = FastAPI()
app.include_router(
my_router.router,
prefix="/r",
tags=["my-router"],
)
@app.get('/')
def hello():
return 'Hello world'
router.py
文件:
from fastapi import APIRouter, Depends
from .. import config
router = APIRouter()
@router.get('/test')
def get_param_list(user_id: int, setting: config.Setting = Depends(config.get_setting)):
return setting
這樣我就可以使用test_api.py
中的dependency_overrides
來更改測試的配置:
from fastapi.testclient import TestClient
from .. import config, server
client = TestClient(server.app)
TEST_PARAM_FOLDER = 'server/test/param'
TEST_RESULT_FOLDER = 'server/test/result'
def get_setting_override():
return config.Setting(param_folder=TEST_PARAM_FOLDER, result_folder=TEST_RESULT_FOLDER)
server.app.dependency_overrides[config.get_setting] = get_setting_override
def test_1():
...
唯一的缺點是我必須在每個需要設置的 function 調用中添加設置:config.Setting = Depends(config.get_setting),這非常“繁重”。
您可以使用來自 fastapi_utils package 的基於Class 的視圖:
from fastapi import APIRouter, Depends
from fastapi_utils.cbv import cbv
from starlette import requests
from logging import Logger
from .. import config
router = APIRouter()
@cbv(router)
class MyQueryCBV:
settings: config.Setting = Depends(config.get_setting) # you can introduce settings dependency here
def __init__(self, r: requests.Request): # called for each query
self.logger: Logger = self.settings.logger
self.logger.warning(str(r.headers))
@router.get('/test')
def get_param_list(self, user_id: int)
self.logger.warning(f"get_param_list: {user_id}")
return self.settings
@router.get("/test2")
def get_param_list2(self):
self.logger.warning(f"get_param_list2")
return self.settings
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