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"
...
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"
How can I use these functions together and get desired result?
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
This is explained in the docs:
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 theFn::GetAtt
intrinsic function.