如何在CloudFormation模板中同时使用Sub和GetAtt函数？ [英] How to use Sub and GetAtt functions at the same time in CloudFormation template?

问题描述

我创建了CloudFormation yaml模板，并且需要使用！GetAtt TestLambda.Arn 作为！Sub AWS :: ApiGateway :: Method函数中的集成Uri：

I create CloudFormation yaml template and I need to use !GetAtt "TestLambda.Arn" as part of !Sub function in "AWS::ApiGateway::Method" Integration Uri:

...
Type: "AWS::ApiGateway::Method"
  Properties:
    RestApiId:
      Ref: "RestApi"
    ResourceId:
      Ref: "TestResource"
    HttpMethod: "GET"
    AuthorizationType: "NONE"
    Integration:
      Type: "AWS_PROXY"
      IntegrationHttpMethod: "POST"
      Uri: !Sub "arn:aws:apigateway:us-east-1:lambda:path/2015-03-31/functions/[[place where I want to use !GetAtt "TestLambda.Arn"]]/invocations"
...

结果是我想得到类似这样的值：

As result I want to get a value something like that:

"arn:aws:apigateway:us-east-1:lambda:path/2015-03-31/functions/my-endpoint-lambda/invocations"

如何一起使用这些功能并获得所需的结果？

How can I use these functions together and get desired result?

推荐答案

您无需在此处使用！GetAtt ！Sub 会自动为您解压缩值：

You don't need to use !GetAtt here, !Sub will automatically unpack values for you if you place them within the place holder:

Uri: !Sub arn:aws:apigateway:us-east-1:lambda:path/2015-03-31/functions/${TestLambda.Arn}/invocations

docs ：

如果您指定模板参数名称或资源逻辑ID，例如 $ {InstanceTypeParameter} ，AWS CloudFormation返回与使用Ref内部函数相同的值。如果您指定资源属性，例如 $ {MyInstance.PublicIp} ，则AWS CloudFormation返回的值与使用 Fn :: GetAtt 内在函数。

If you specify template parameter names or resource logical IDs, such as ${InstanceTypeParameter}, AWS CloudFormation returns the same values as if you used the Ref intrinsic function. If you specify resource attributes, such as ${MyInstance.PublicIp}, AWS CloudFormation returns the same values as if you used the Fn::GetAtt intrinsic function.

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