python 中 AWS Lambda 的请求模块问题

Question

我正在编写一个 lambda 函数，目的是使用请求从 Wolfram CloudObject 中提取信息。这是代码的相关部分：

from __future__ import print_function
import requests

.
.
.

def on_intent(intent_request, session):
    print("on_intent requestID=" + intent_request['requestID'] + ", sessionID=" + session['sessionId'])

    intent = intent_request['intent']
    intent_name = intent_request['intent']['name']

    # Dispatch to skill's intent handlers

    if intent_name == "GetEvent":
         return call_wolfram(intent, session)
    elif intent_name == "AMAZON.HelpIntent":
         return get_welcome_response()
    elif intent_name == "AMAZON.CancelIntent" or intent_name == "AMAZON.StopIntent":
         return handle_session_end_request()
    else:
         raise ValueError("Invalid intent")

.
.
.

# Functions that control skill's behavior

def call_wolfram(intent, session):
    url = "https://path-to-cloud-object"
    query = {'string1': 'VESSEL', 'string2': 'EVENT', 'RelString': 'TRIGGERED'}
    r = requests.get(url, params=query)
    session_attributes = {"r_result": r}
    speech_output = "Congrats, dummy! It worked"
    card_title = "Query"
    should_end_session = True
    return build_response({}, build_speechlet_response(card_title, speech_output, None, should_end_session)

其余大部分代码遵循 AWS 提供的 MyColorIs 示例模板，并进行了极小的改动。测试lambda函数时，报错信息给了我一个json file with stackTrace；我已将问题缩小到代码行 r = requests.get() 和 session_attributes = {}，因为当注释掉时，lambda 执行成功。这是我使用 python 的第一个项目，所以我也是这门语言的新手。为了更好地衡量，这是我在 lambda 执行后收到的错误消息：

{
  "stackTrace": [
   [
     "/var/task/query_lambda.py",
     27,
     "lambda_handler",
     "return on_intent(event['request'], event['session'])"
   ],
   [
     "/var/task/query_lambda.py",
     65,
     "on_intent",
     "return call_wolfram(intent, session)"
   ],
   [
     "/var/task/query_lambda.py",
     113,
     "call_wolfram",
     "r = requests.get(url, params=query)"
   ],
   [
     "/var/task/requests/api.py",
     71,
     "get",
     "return request('get', url, params=params, **kwargs)"
   ],
   [
     "/var/task/requests/api.py",
     57,
     "request",
     "return session.request(method=method, url=url, **kwargs)"
   ],
   [
     "/var/task/requests/sessions.py",
     475,
     "request",
     "resp = self.send(prep, **send_kwargs)"
   ],
   [
     "/var/task/requests/sessions.py",
     585,
     "send",
     "r = adapter.send(request, **kwargs)"
   ],
   [
     "/var/task/requests/adapters.py",
     477,
     "send",
     "raise SSLError(e, request=request)"
    ]
  ],
    "errorType": "SSLError",
    "errorMessage": "[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify    failed (_ssl.c:590)"
}

Answer 1

您可以在此处详细了解请求对证书的使用：

http://docs.python-requests.org/en/master/user/advanced/

有两种方法可以解决这个问题：

找到您丢失的证书，并将其安装到出现故障的系统上。
通过将 verify=False 传递给 requests.get 来完全忽略证书：

r = requests.get(url, params=query, verify=False)

第二种方法更快，但不太安全；这对您的预期用途可能重要，也可能不重要。

Answer 2

lambda 环境不包含 certifi 模块，除非您将其与函数一起上传。

我会这样做：

cd <directory with your lambda>
pip install certifi -t .
zip ../lambda *

然后上传../lambda.zip到亚马逊。

python 中 AWS Lambda 的请求模块问题

Issue with requests module in python for AWS Lambda

python

amazon-web-services

aws-lambda