python3 try/except 使用坚韧装饰器时似乎失败

Question

如果所有重试都失败，请尝试使用请求函数实现 retry/backoff 然后 return HTTP 状态。看来我可以让重试工作或使用 try/except，但不能同时使用。包装在另一个函数中没有帮助。

Python 3.7.7 OSX mojave 请求 2.24.0 韧性 6.2.0

带有装饰器但没有 try/except 的函数 1 调用韧性规则，但我没有收到 return:

的 http 错误

In [1330]: @retry(reraise=True,wait=wait_fixed(1), stop=stop_after_attempt(3))
      ...: def geturl(url):
      ...:     """
      ...:     get the url and raise http request errors for tenacity
      ...:     """
      ...:     print(datetime.now().strftime('%Y-%m-%d-%H:%M:%S'))
      ...:     headers = {'user-agent': 'my-app/0.0.1','Content-Type':'application/json'}
      ...:     data = {'name':'testcall','service':'armor'}
      ...:     r=None
      ...:     r = requests.post(url, data=json.dumps(data), headers=headers)
      ...:     r.raise_for_status()
      ...:     return r.status_code
      ...:

In [1331]: geturl(flakyurl)
2020-09-07-14:48:19
DEBUG:urllib3.connectionpool:Starting new HTTP connection (1): snout:7777
DEBUG:urllib3.connectionpool:http://snout:7777 "POST /flakyservice HTTP/1.1" 406 27
2020-09-07-14:48:20
DEBUG:urllib3.connectionpool:Starting new HTTP connection (1): snout:7777
DEBUG:urllib3.connectionpool:http://snout:7777 "POST /flakyservice HTTP/1.1" 405 27
2020-09-07-14:48:21
DEBUG:urllib3.connectionpool:Starting new HTTP connection (1): snout:7777
DEBUG:urllib3.connectionpool:http://snout:7777 "POST /flakyservice HTTP/1.1" 405 27
---------------------------------------------------------------------------
HTTPError                                 Traceback (most recent call last)
...

HTTPError: 405 Client Error: METHOD NOT ALLOWED for url: http://snout:7777/flakyservice

具有 try/except 的函数 2 得到正确的错误，但未能调用 tenacity

In [1332]: @retry(reraise=True,wait=wait_fixed(1), stop=stop_after_attempt(3))
      ...: def geturl3(url):
      ...:         print(datetime.now().strftime('%Y-%m-%d-%H:%M:%S'))
      ...:         headers = {'user-agent': 'my-app/0.0.1','Content-Type':'application/json'}
      ...:         data = {'name':'testcall','service':'armor'}
      ...:         r=None
      ...:         try:
      ...:             r = requests.post(url, data=json.dumps(data), headers=headers)
      ...:             r.raise_for_status()
      ...:             return 'sent', r.status_code
      ...:         except requests.exceptions.HTTPError as err:
      ...:             return 'http failed', err
In [1334]: geturl3(flakyurl)
2020-09-07-15:23:00
DEBUG:urllib3.connectionpool:Starting new HTTP connection (1): snout:7777
DEBUG:urllib3.connectionpool:http://snout:7777 "POST /flakyservice HTTP/1.1" 404 27
Out[1334]:
('http failed',
 requests.exceptions.HTTPError('404 Client Error: NOT FOUND for url: http://snout:7777/flakyservice'))

编辑：解决方法是在异常之后 r.raise_for_status() - 这会重新引发并捕获 tenacity

Answer 1

在编辑后的问题中回答：解决方法是在异常后 r.raise_for_status() - 这会重新引发并捕获 tenacity

python3 try/except 使用坚韧装饰器时似乎失败

python3 try/except appears to fail when using a tenacity decorator

python-3.x

python-requests

tenacity