AWS：cloudformation CommaDelimitedList 和手動列表不匹配

Question

我正在嘗試創建一個具有默認值的 cloudformation 模板，並且正在運行一些!Sub函數來將導入的參數替換到模板中。 但是，我正在將一個列表傳遞給 nodejs Lambda function ，我需要在發送之前!Sub 。

我正在編寫的代碼：

AWSTemplateFormatVersion: '2010-09-09'
Transform: 'AWS::Serverless-2016-10-31'
Description: Creating Athena database and tables

Parameters:
  S3DataLocations:
    Type: CommaDelimitedList
    Description: The S3 locations where the logs are read from (Specify 'Use,Default' to inherit defaults)
    Default: Use,Default

Conditions:
  CustomS3DataLocations: !Equals ['Use,Default', !Join [",", !Ref S3DataLocations]]

Resources:
  # Custom resource for running CreateTableFunction, to create databases
  CreateLogTable:
    Type: Custom::CreateLogTable
    Properties:
      ServiceToken: !GetAtt [CreateLogTableFunction, Arn]
      S3DataLocations:
        Fn::If:
          - CustomS3DataLocations
          - !Split
            - ","
            - !Sub
              - s3://${LoggingBucket}/data/ApplicationLogs1/,
                s3://${LoggingBucket}/data/ApplicationLogs2/,
                s3://${LoggingBucket}/data/ApplicationLogs3/
              - { LoggingBucket: !ImportValue Parent-LoggingBucket}
          - !Ref S3DataLocations

如果我將這些作為文字外部數據DataTypes參數傳遞s3://logbucket/data/ApplicationLogs1/,s3://logbucket/data/ApplicationLogs2/,s3://logbucket/data/ApplicationLogs3/它工作正常並轉換為["s3://logbucket/data/ApplicationLogs1/","s3://logbucket/data/ApplicationLogs2/","s3://logbucket/data/ApplicationLogs3/"]並由 Lambda 毫無問題地解釋。 該參數通過CommaDelimitedList類型進行解析，並毫無問題地傳遞給 Lambda。

出現問題是因為我正在嘗試創建手動默認值，所以我需要將!Sub列表作為字符串，然后將!Split作為實際列表傳遞給自定義 Lambda。這似乎不起作用我嘗試了每一種方式，但我不知道為什么。

我一直在檢查成功（手動參數）和失敗（默認值，沒有手動參數），我看不出有什么大的不同。 lambda 的事件顯示，工作時：

{
    "RequestType": "Create",
    "ServiceToken": "hidden",
    "ResponseURL": "hidden",
    "StackId": "hidden",
    "RequestId": "hidden",
    "LogicalResourceId": "CreateLogTable",
    "ResourceType": "Custom::CreateLogTable",
    "ResourceProperties": {
        "S3DataLocations": [
            "s3://loggingbucket/data/ApplicationLogs/",
            "s3://loggingbucket/data/ApplicationLogs/",
            "s3://loggingbucket/data/ApplicationLogs/",
            "s3://loggingbucket/data/ApplicationLogs/"
        ]
    }
}

當不工作時：

...
{
    "RequestType": "Create",
    "ServiceToken": "hidden",
    "ResponseURL": "hidden",
    "StackId": "hidden",
    "RequestId": "hidden",
    "LogicalResourceId": "CreateLogTable",
    "ResourceType": "Custom::CreateLogTable",
    "ResourceProperties": {
        "S3DataLocations": [
            "s3://logging/data/ApplicationLogs/",
            " s3://loggingbucket/data/ApplicationLogs/",
            " s3://loggingbucket/data/ApplicationLogs/",
            " s3://loggingbucket/data/ApplicationLogs/"
        ]
    }
}

我有點卡在這里，我認為可能存在一些類型不匹配，但我無法分辨手冊和參數之間的區別。

有人有什么主意嗎？

Answer 1

您可以使用引號和斜杠組合將字符串分成多行，同時防止將\n更改為空格。

為了驗證這一點，我針對您的情況使用了以下代理模板：

Resources:

  MyBucket:
    Type: AWS::S3::Bucket
    Properties: {}

Outputs:
  Test1:
    Value: !Sub
          - s3://${LoggingBucket}/data/ApplicationLogs1/,
            s3://${LoggingBucket}/data/ApplicationLogs2/,
            s3://${LoggingBucket}/data/ApplicationLogs3/
          - { LoggingBucket: "Parent-LoggingBucket"}

  Test2:
    Value: !Sub
          - "s3://${LoggingBucket}/data/ApplicationLogs1/,\
            s3://${LoggingBucket}/data/ApplicationLogs2/,\
            s3://${LoggingBucket}/data/ApplicationLogs3/"
          - { LoggingBucket: "Parent-LoggingBucket"}   

Test1生成帶有空格的字符串，如您的問題所示：

s3://Parent-LoggingBucket/data/ApplicationLogs1/, s3://Parent-LoggingBucket/data/ApplicationLogs2/, s3://Parent-LoggingBucket/data/ApplicationLogs3/

相比之下， Test2沒有空間：

s3://Parent-LoggingBucket/data/ApplicationLogs1/,s3://Parent-LoggingBucket/data/ApplicationLogs2/,s3://Parent-LoggingBucket/data/ApplicationLogs3/