Terraform script to specify input transformer in Cloudwatch Event Rule to get a string output.

[sgha...@usc.edu]

Hi,

I am trying to set a CloudWatch Event Rule and specify an Input Transformer in it.

This output will be passed on to a Lambda function.

I need a string output to be passed on to my Lambda function.

However I am not able to find the corresponding Terraform notation to specify the output to be string.

Following is the code snippet: 

resource "aws_cloudwatch_event_target" "event_target" {

  rule      = "${aws_cloudwatch_event_rule.user_tagger_rule.name}"

  target_id = "SendToLambda"

  arn       = "${aws_lambda_function.user_tagger.arn}"

  input_transformer = {

   input_paths = {

       instance="$.detail.responseElements.instancesSet.items[0].instanceId",

       user="$.detail.userIdentity.arn"

       }

   input_template = 

   "{\"Instance\":<instance>,\"created by user\":<user>}"

  }

}

I needed to know the format of input_template to get the output as string.

If the {} are removed getting a syntax error.

Current Output:{"Instance":<instance>,"created by user":<user>}

Expected Output: "Instance <instance> was created by user <user>"

Link to documentation I am referring to:  https://www.terraform.io/docs/providers/aws/r/cloudwatch_event_target.html#input_template

Please help to resolve.

Thanks,

Sayali

[rahul jain]

try

input_template = "${jsonencode("Your ECS cluster '<clusterARN>' was stopped unexpectedly due to '<reason>'. StopCode is '<stopCode>'.")}"