无法封送响应：JSONDecodeError

Question

我有一个触发 Lambda 的 AWS Stepfunction。不幸的是，我无法正确解码输入：

从 AWS Stepfunction 到 Lambda 的输入：

{

  "MessageNumber": 0,

  "message": {

    "MessageId": "ae5b5d59-6829-4a19-b508-2ba35614e2de",

    "ReceiptHandle": "AQEBJsP+Et+WcgstIR9kkA3sH4UDoxYYcoDT2YYa30K87Rx2wSEFaZNg3CNdsjE18LSDMNXWg7VoV/s/p0bSL0PaUxQ0FV34RAwavG0iGMi",

    "MD5OfBody": "a726ec7fdda41e454850580e1a2cf4b4",

    "Body": "{'stage': 'tst', 'directory': '\\\\\\\\mydomain\\\\data\\\\results', 'variableFilters': ['\\\\filters\\\\x1.txt', '\\\\filters\\\\a1.txt']}",

    "Attributes": {

      "SenderId": "xxx",

      "ApproximateFirstReceiveTimestamp": "xxx",

      "ApproximateReceiveCount": "2",

      "SentTimestamp": "xxx",

      "SequenceNumber": "xxx",

      "MessageDeduplicationId": "xxx",

      "MessageGroupId": "1"

    }

  }

}

Python代码如下：

def lambda_handler(event, context):

    print(f'Received Event: {event}')

    try:

        body = json.loads(event.get('message').get('Body'))

        stage = body["stage"]

        directory= body["directory"]

    except Exception as e:

        return (e)

我收到错误：

{

  "errorMessage": "Unable to marshal response: JSONDecodeError('Expecting property name enclosed in double quotes: line 1 column 2 (char 1)') is not JSON serializable",

  "errorType": "Runtime.MarshalError"

}

有人知道如何解决这个问题吗？

Answer 1

您必须将 .txt 中的单引号替换为双引号body。因为在有效的 JSON 中，字符串以"body = "{'stage': 'tst', 'directory': '\\\\\\\\mydomain\\\\data\\\\results', 'variableFilters': ['\\\\filters\\\\x1.txt', '\\\\filters\\\\a1.txt']}"body = json.loads(body.replace('\'', '"'))