[英]How to test Retry attempts in python using the request library
我有以下內容:
from requests.adapters import HTTPAdapter
from requests.packages.urllib3.util.retry import Retry
retry_strategy = Retry(
total=3,
status_forcelist=[429, 500, 502, 503, 504],
method_whitelist=["HEAD", "GET", "OPTIONS"]
)
adapter = HTTPAdapter(max_retries=retry_strategy)
http = requests.Session()
http.mount("https://", adapter)
http.mount("http://", adapter)
response = http.get("some_endpoint")
如何有效地對我重試 N 次(在本例中為 3 次)進行單元測試?
想知道同樣的問題,我找不到任何建議,甚至在 Stack Overflow 上也找不到。 但我真的很想確保它按我預期的那樣工作......
我花了一段時間才弄清楚在哪里以及如何修補urllib3
以正確測試它,但這是迄今為止我想出的最佳解決方案,為您節省了幾個小時的研究時間:
import urllib3
from http.client import HTTPMessage
from unittest.mock import ANY, Mock, patch, call
import requests
import pytest
def request_with_retry(*args, **kwargs):
session = requests.Session()
adapter = requests.adapters.HTTPAdapter(max_retries=urllib3.Retry(
raise_on_status=False,
total=kwargs.pop("max_retries", 3),
status_forcelist=[429, 500, 502, 503, 504], # The HTTP response codes to retry on
allowed_methods=["HEAD", "GET", "PUT", "DELETE", "OPTIONS"], # The HTTP methods to retry on
))
session.mount("https://", adapter)
session.mount("http://", adapter)
return session.request(*args, **kwargs)
@patch("urllib3.connectionpool.HTTPConnectionPool._get_conn")
def test_retry_request(getconn_mock):
getconn_mock.return_value.getresponse.side_effect = [
Mock(status=500, msg=HTTPMessage()),
Mock(status=429, msg=HTTPMessage()),
Mock(status=200, msg=HTTPMessage()),
]
r = request_with_retry("GET", "http://any.url/testme", max_retries=2)
r.raise_for_status()
assert getconn_mock.return_value.request.mock_calls == [
call("GET", "/testme", body=None, headers=ANY),
call("GET", "/testme", body=None, headers=ANY),
call("GET", "/testme", body=None, headers=ANY),
]
(注意:如果您多次調用此方法,那么您可能只想初始化 session object 一次,而不是每次發出請求!)
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