Amazon cloudformation AWS云信息Fn:：导入值不'；我不喜欢！参加

我的CloudFormation模板中有以下资源，它正在尝试创建侦听器规则。想法是，基于传入的EnvironmentType和AWS区域，我想从导出它的相应CloudFormation堆栈导入侦听器ARN

Parameters:
  EnvironmentType:
    Type: String
    Default: "sandbox"
  ECSClusterStackNameParameter:
    Type: String
    Default: "ECS-US-Sandbox"

Mappings:
  production:
    us-east-1:
      stackWithAlbListenerInfo: "ECS-US-Prod"
    eu-north-1:
      stackWithAlbListenerInfo: "ECS-EU-Prod"
  staging:
    us-east-1:
      stackWithAlbListenerInfo: "ECS-US-Staging"
    eu-north-1:
      stackWithAlbListenerInfo: ""
  sandbox:
    us-east-1:
      stackWithAlbListenerInfo: "ECS-US-Sandbox"
    eu-north-1:
      stackWithAlbListenerInfo: ""

Conditions:
  StackExists:
    !Not [ !Equals [ !FindInMap [ !Ref EnvironmentType, !Ref "AWS::Region", stackWithAlbListenerInfo ], ""] ]

Resources:
  AlbListenerRule:
    Type: AWS::ElasticLoadBalancingV2::ListenerRule
    Condition: UseListenerRule
    Properties:
      ListenerArn:
        !If
          - StackExists
          -
            - Fn::ImportValue:
                !Join
                  - "-"
                  - - !FindInMap [ !Ref EnvironmentType, !Ref "AWS::Region", stackWithAlbListenerInfo ]
                    - "ListenerArn"
          - Fn::ImportValue:
              - !Sub "${ECSClusterStackNameParameter}-ListenerArn"

但是，由于此错误，它无法验证，并且第一个

Fn:：ImportValue:

似乎不喜欢

！加入

。但是

！Join

返回连接的字符串是否正确？我错过了什么

ERROR: Service: marcom-stats-service, cfnUpdate error: com.amazonaws.services.cloudformation.model.AmazonCloudFormationException: Template error: the attribute in Fn::ImportValue must be a string or a function that returns a string (Service: AmazonCloudFormation; Status Code: 400; Error Code: ValidationError; Request ID: 2678552e-cf6c-46e1-b640-a7c07de385c2; Proxy: null)

更新：

虽然Robert Kossendey的回答修复了我的错误，但我原来的模板是错误的。这就是我真正想做的。我希望它能帮助别人

  AlbListenerRule:
    Type: AWS::ElasticLoadBalancingV2::ListenerRule
    Condition: UseListenerRule
    Properties:
      ListenerArn:
        Fn::ImportValue: !Sub
          - ${StackName}-ListenerArn
          - { StackName: !If [ StackExists, !FindInMap [ !Ref EnvironmentType, !Ref "AWS::Region", stackWithAlbListenerInfo ], !Ref ECSClusterStackNameParameter ] }

---

现在我看到了，我想。在第二次导入时，您需要删除

前面的破折号！子

：

- Fn::ImportValue:
  !Sub "${ECSClusterStackNameParameter}-ListenerArn"

---

您能否删除Fn:ImportValue前面的破折号？我认为If函数不希望在那里出现嵌套列表，所以可能这也会导致问题。谢谢，我试过了，得到了相同的错误。谢谢，就是这样。我看错地方了。没问题，如果这对你有帮助的话，请投上一票！