Python 3.x 测试AWS Lambda处理程序函数时出错：事件和上下文参数的数据格式

我从一个博客中得到了以下代码，它得到了今天比特币的价格。我可以从AWS Lex控制台访问这个Lambda函数，并测试bot以获得今天的价格

"""
Lexbot Lambda handler.
"""
from urllib.request import Request, urlopen
import json

def get_bitcoin_price(date):
    print('get_bitcoin_price, date = ' + str(date))
    request = Request('https://rest.coinapi.io/v1/ohlcv/BITSTAMP_SPOT_BTC_USD/latest?period_id=1DAY&limit=1&time_start={}'.format(date))
    request.add_header('X-CoinAPI-Key', 'E4107FA4-A508-448A-XXX')
    response = json.loads(urlopen(request).read())
    return response[0]['price_close']

def lambda_handler(event, context):
    print('received request: ' + str(event))
    date_input = event['currentIntent']['slots']['Date']
    btc_price = get_bitcoin_price(date_input)
    response = {
        "dialogAction": {
            "type": "Close",
            "fulfillmentState": "Fulfilled",
            "message": {
              "contentType": "SSML",
              "content": "Bitcoin's price was {price} dollars".format(price=btc_price)
            },
        }
    }
    print('result = ' + str(response))
    return response

但是当我从AWS Lex控制台测试函数时，我得到以下错误：

 Response:
{
  "errorMessage": "'currentIntent'",
  "errorType": "KeyError",
  "stackTrace": [
    [
      "/var/task/lambda_function.py",
      18,
      "lambda_handler",
      "date_input = event['currentIntent']['slots']['Date']"
    ]
  ]
}

Request ID:
"2488187a-2b76-47ba-b884-b8aae7e7a25d"

Function Logs:
START RequestId: 2488187a-2b76-47ba-b884-b8aae7e7a25d Version: $LATEST
received request: {'Date': 'Feb 22'}
'currentIntent': KeyError
Traceback (most recent call last):
  File "/var/task/lambda_function.py", line 18, in lambda_handler
    date_input = event['currentIntent']['slots']['Date']
KeyError: 'currentIntent'

如何在AWS Lambda控制台中测试功能？”lambda_handler函数的“事件”和“上下文”的格式是什么？还有，这里的“上下文”是什么

---

在本例中，我应该将什么作为“事件”和“上下文”传递？

您的代码失败，因为

事件

对象中填充了

{'Date'：'Feb 22'}

，但您的代码期望的远不止这些。因此，当您试图通过访问

currentIntent

来解析此JSON时，它会失败：

date\u input=event['currentIntent']['slots']['date']

从控制台进行测试时，不能将任何

上下文

传递给Lambda，因为它是由AWS自动填充的。而且，上下文只在非常特定的场合使用，所以我现在不担心它

但是，您可以将

事件

作为参数传递，并且有很多方法可以做到这一点。手动执行此操作的最简单方法是转到AWS的Lambda控制台，单击Test，如果您尚未配置任何测试事件，将弹出以下屏幕

现在，在下拉列表中，您可以选择您的事件，AWS将为您填写，如下所示：

{
  "messageVersion": "1.0",
  "invocationSource": "FulfillmentCodeHook or DialogCodeHook",
  "userId": "user-id specified in the POST request to Amazon Lex.",
  "sessionAttributes": { 
     "key1": "value1",
     "key2": "value2",
  },
  "bot": {
    "name": "bot-name",
    "alias": "bot-alias",
    "version": "bot-version"
  },
  "outputDialogMode": "Text or Voice, based on ContentType request header in runtime API request",
  "currentIntent": {
    "name": "intent-name",
    "slots": {
      "slot-name": "value",
      "slot-name": "value",
      "slot-name": "value"
    },
    "confirmationStatus": "None, Confirmed, or Denied
      (intent confirmation, if configured)"
  }
}

现在，您可以根据自己的需要定制活动

保存它并单击Test后，将使用提供的JSON填充

事件
对象

另一个选项是检查，这样您就可以简单地获取您想要的任何JSON事件，并相应地对其进行定制

我为您抓取了Lex示例事件，如下所示：

{
  "messageVersion": "1.0",
  "invocationSource": "FulfillmentCodeHook or DialogCodeHook",
  "userId": "user-id specified in the POST request to Amazon Lex.",
  "sessionAttributes": { 
     "key1": "value1",
     "key2": "value2",
  },
  "bot": {
    "name": "bot-name",
    "alias": "bot-alias",
    "version": "bot-version"
  },
  "outputDialogMode": "Text or Voice, based on ContentType request header in runtime API request",
  "currentIntent": {
    "name": "intent-name",
    "slots": {
      "slot-name": "value",
      "slot-name": "value",
      "slot-name": "value"
    },
    "confirmationStatus": "None, Confirmed, or Denied
      (intent confirmation, if configured)"
  }
}

将其用作您的事件，您将能够相应地对其进行测试