将参数输入Cloudwatch事件规则Cloudformation中的输入参数

Question

我正在创建一个Cloudwatch事件规则，如果步骤函数进入故障或超时状态，它应该会触发lambda。云观察事件规则将参数传递给lambda，这将发送一封自定义的SNS电子邮件。我正在尝试将输入参数的值从我在云形成模板中设置的参数传递到Cloudwatch事件规则中。我无法让Cloudform将参数值提取出来，将它们放入Cloudwatch事件规则输入参数中。CF接受我在JSON中给出的文字值并将其放入Cloudwatch事件规则中。我正在使用带有JSON参数文件的YAML模板。发布下面的代码。

FailureEvent:
Type: AWS::Events::Rule
DependsOn:
  - StateMachine
Properties:
  Description: !Ref FailureRuleDescription
  Name: !Ref FailureRuleName
  EventPattern:
    detail-type:
      - "Step Functions Execution Status Change"
    detail:
      status:
        - "FAILED"
        - "TIMED_OUT"
      stateMachineArn: [!Ref StateMachine]
  Targets:
    - Arn:
        'Fn::Join': ["", ['arn:aws:lambda:', !Ref 'AWS::Region', ':', !Ref 'AWS::AccountId', ':function:', !Ref FailureLambda]]
      Id: !Ref FailureLambda
      Input: '{"failed_service": "!Ref StateMachineName","sns_arn": {"Fn::Join":[":",["arn: aws: sns",{"Ref": "AWS: : Region"},{"Ref": "AWS::AccountId"},{"Ref": "SNSTopic"}]]}}'

Answer 1

您可以使用Sub：

Input: !Sub '{"failed_service": "${StateMachineName}","sns_arn": "arn:aws:sns:${AWS::Region}:${AWS::AccountId}:${SNSTopic}"}'