我在 AWS deeplens 上使用本指南。我正在试验代码，并且在某一时刻它停止了对第二个独立 lambda 函数的工作。在某些时候，代码开始出现异常，而我最近才注意到它。
这是有问题的代码：
def sendMessageToIoTTopic(iotMessage):
# this is a default topic if its not specified in the lambda envirionment
topicName = "worker-safety"
if "iot_topic" in os.environ:
topicName = os.environ['iot_topic']
print("Send message to topic: " + topicName + " before")
iotClient = boto3.client('iot-data', region_name='us-east-1')
response = iotClient.publish(
topic=topicName,
qos=1,
payload=json.dumps(iotMessage)
)
print("Send message to topic: " + topicName + "after")
print("using this topic **{}** response is {}".format(topicName, response))
该指南说将默认超时时间从 1 秒修改为 3 秒。这是此代码的日志，超时时间为 3 秒。
2021-01-31T14:28:35.579-05:00 Before we send to iot MQTT?
2021-01-31T14:28:35.579-05:00 Send message to topic: worker-safety-demo-cloud before
2021-01-31T14:28:36.202-05:00 END RequestId: 89794691-a149-4480-b0bd-fd1a69522774
2021-01-31T14:28:36.202-05:00 REPORT RequestId: 89794691-a149-4480-b0bd-fd1a69522774 Duration: 3003.48 ms Billed Duration: 3000 ms Memory Size: 128 MB Max Memory Used: 35 MB
2021-01-31T14:28:36.202-05:00 2021-01-31T19:28:36.201Z 89794691-a149-4480-b0bd-fd1a69522774 Task timed out after 3.00 seconds
2021-01-31T14:28:38.016-05:00 START RequestId: 71562d34-28d6-471a-8a43-b1e0bab1d621 Version: $LATEST
将 lambda 函数的超时时间从 3 秒调整为 15 秒，可以让我们详细查看超时错误。它表明这是一个 SSL 错误。
这是包含更多信息的生成日志：
2021-01-31T14:36:08.775-05:00 Before we send to iot MQTT?
2021-01-31T14:36:08.775-05:00 Send message to topic: worker-safety-demo-cloud before
2021-01-31T14:36:17.295-05:00 [ERROR] SSLError: SSL validation failed for https://data.iot.us-east-1.amazonaws.com/topics/worker-safety-demo-cloud?qos=1 [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1091) Traceback (most recent call last): File "/var/task/lambda_function.py", line 177, in lambda_handler sendMessageToIoTTopic(iotMessage) File "/var/task/lambda_function.py", line 119, in sendMessageToIoTTopic payload=json.dumps(iotMessage) File "/var/runtime/botocore/client.py", line 357, in _api_call return self._make_api_call(operation_name, kwargs) File "/var/runtime/botocore/client.py", line 663, in _make_api_call operation_model, request_dict, request_context) File "/var/runtime/botocore/client.py", line 682, in _make_request return self._endpoint.make_request(operation_model, request_dict) File "/var/runtime/botocore/endpoint.py", line 102, in make_request return self._send_request(request_dict, operation_model) File "/var/runtime/botocore/endpoint.py", line 137, in _send_request success_response, exception): File "/var/runtime/botocore/endpoint.py", line 256, in _needs_retry caught_exception=caught_exception, request_dict=request_dict) File "/var/runtime/botocore/hooks.py", line 356, in emit return self._emitter.emit(aliased_event_name, **kwargs) File "/var/runtime/botocore/hooks.py", line 228, in emit return self._emit(event_name, kwargs) File "/var/runtime/botocore/hooks.py", line 211, in _emit response = handler(**kwargs) File "/var/runtime/botocore/retryhandler.py", line 183, in __call__ if self._checker(attempts, response, caught_exception): File "/var/runtime/botocore/retryhandler.py", line 251, in __call__ caught_exception) File "/var/runtime/botocore/retryhandler.py", line 277, in _should_retry return self._checker(attempt_number, response, caught_exception) File "/var/runtime/botocore/retryhandler.py", line 317, in __call__ caught_exception) File "/var/runtime/botocore/retryhandler.py", line 223, in __call__ attempt_number, caught_exception) File "/var/runtime/botocore/retryhandler.py", line 359, in _check_caught_exception raise caught_exception File "/var/runtime/botocore/endpoint.py", line 200, in _do_get_response http_response = self._send(request) File "/var/runtime/botocore/endpoint.py", line 269, in _send return self.http_session.send(request) File "/var/runtime/botocore/httpsession.py", line 281, in send raise SSLError(endpoint_url=request.url, error=e)
2021-01-31T14:36:17.296-05:00 END RequestId: 0da11ea2-c9d3-42ce-a8d5-cd3e709bf42e
详细的 SSL 错误是这样的：
[ERROR] SSLError: SSL validation failed for https://data.iot.us-east-1.amazonaws.com/topics/worker-safety-demo-cloud?qos=1 [SSL: CERTIFICATE_VERIFY_FAILED]
certificate verify failed: unable to get local issuer certificate (_ssl.c:1091)Traceback (most recent call last):
File "/var/task/lambda_function.py", line 177, in lambda_handler sendMessageToIoTTopic(iotMessage)
File "/var/task/lambda_function.py", line 119, in sendMessageToIoTTopic payload=json.dumps(iotMessage)
File "/var/runtime/botocore/client.py", line 357, in _api_call return self._make_api_call(operation_name, kwargs)
File "/var/runtime/botocore/client.py", line 663, in _make_api_call operation_model, request_dict, request_context)
File "/var/runtime/botocore/client.py", line 682, in _make_request return self._endpoint.make_request(operation_model, request_dict)
File "/var/runtime/botocore/endpoint.py", line 102, in make_request return self._send_request(request_dict, operation_model)
File "/var/runtime/botocore/endpoint.py", line 137, in _send_request success_response, exception):
File "/var/runtime/botocore/endpoint.py", line 256, in _needs_retry caught_exception=caught_exception, request_dict=request_dict)
File "/var/runtime/botocore/hooks.py", line 356, in emit return self._emitter.emit(aliased_event_name, **kwargs)
File "/var/runtime/botocore/hooks.py", line 228, in emit return self._emit(event_name, kwargs)
File "/var/runtime/botocore/hooks.py", line 211, in _emit response = handler(**kwargs) File "/var/runtime/botocore/retryhandler.py", line 183, in __call__ if self._checker(attempts, response, caught_exception):
File "/var/runtime/botocore/retryhandler.py", line 251, in __call__ caught_exception) File "/var/runtime/botocore/retryhandler.py", line 277, in _should_retry return self._checker(attempt_number, response, caught_exception)
File "/var/runtime/botocore/retryhandler.py", line 317, in __call__ caught_exception) File "/var/runtime/botocore/retryhandler.py", line 223, in __call__ attempt_number, caught_exception)
File "/var/runtime/botocore/retryhandler.py", line 359, in _check_caught_exception raise caught_exception
File "/var/runtime/botocore/endpoint.py", line 200, in _do_get_response http_response = self._send(request)
File "/var/runtime/botocore/endpoint.py", line 269, in _send return self.http_session.send(request)
File "/var/runtime/botocore/httpsession.py", line 281, in send raise SSLError(endpoint_url=request.url, error=e)