CloudFormation Custom Resource responseKey - amazon-web-services

Question

I have got lambda backed Custom Stack in CloudFormation , So I need the fetch function output and put it to the AWS Console, how I can handle this problem?
My Stack is shown as below ;
"CreateExistingVPC": {
"Type": "Custom::CreateExistingVPC",
"Properties": {
"ServiceToken": { "Fn::If": ["LambdaAvailable",{ "Fn::GetAtt": [ "CustomLogic", "Outputs.LambdaAttachHostedZoneArn" ] }, { "Ref": "AWS::NoValue" } ] },
"Region": { "Ref": "AWS::Region" },
"HostedZoneId": { "Ref": "InternalHostedZone" },
"VpcId": { "Fn::GetAtt": [ "VPC", "Outputs.VPC" ] }
}
}
},
"Outputs": {
"Route53VPC": {
"Description": "ExistingRoute53VPCStatus",
"Value": { "Fn::GetAtt": [ "CreateExistingVPC", "{ ??????? }" ] }
}
}
In actually, I have found some answers but 'response key' not worked in my case , how I can find response key ??
AWS Cloudformation, Output value from Custom Resource

Answer 1

You need to use the variable you are using to return your response. e.g. (nodeJs)
module.exports.createPoolList = (event, context, callback) => {
if (event.RequestType == 'Create') {
let array = event.ResourceProperties.OpsPoolArnList.split(",");
array.push(event.ResourceProperties.UserPool);
let response = {
'list': array.join(),
};
sendresponse(event, "SUCCESS", response, "");
}
if (event.RequestType == 'Delete') {
sendresponse(event, "SUCCESS", null, "");
}
callback(null, "");
};
Here list is the variable which contains my output & returning in my response. The built payload looks like
let payload = {
'StackId': event.StackId,
'Status' : responsestatus,
'Reason' : reason,
'RequestId': event.RequestId,
'LogicalResourceId': event.LogicalResourceId,
'PhysicalResourceId': event.LogicalResourceId + 'qwerty',
'Data': response
};
And I refer to this in my script as
!GetAtt <ResourceName>.list
Hope it helps.