AWS Batch Input Parameter From Cloudwatch Through Terraform

Problem:

I have a terraform project where I’m trying to set up a cloudwatch event rule and target to trigger a new aws batch job submission on a schedule. The issue I’m having is passing a static parameter (ie, a variable representing a command to run) from the cloudwatch event to the batch_target.
Is there a simple way to use the input or input_transformer properties for the event_target to pass through the variable inputCommand to the batch job?

The setup works when I submit a job with that parameter and value set through the console or set a default parameter in the job definition, but I’m having trouble doing it via the cloudwatch event in terraform.

Solution:

You can have below terraform code to provide input parameters for aws cloudwatch . Below I have provided the Template to use parameter

resource "aws_cloudwatch_event_rule" "cron_rule" {
  name        = "my-cron-rule"
  description = "Schedule a Batch job"
  schedule_expression = "cron(0 8 ? * 1-5 *)"  # Run daily at 8 AM on weekdays
  targets = [{
    id         = "my-target"
    arn        = aws_batch_job_definition.my_job_definition.arn
    input      = jsonencode({
      parameters = {
        command = "your_desired_command"
      }
    })
    input_path = "$.detail"
  }]
}
resource "aws_batch_job_definition" "my_job_definition" {
  type          = "container"
  compute_environment = "my-compute-environment"
  container_properties = {
    image              = "your_container_image"
    command            = ["/bin/bash", "-c", "your_command"]
    environment         = [{
      name  = "MY_PARAMETER"
      value = "your_default_value"
    }]
  }
}

Also for the problem that is stated for that code you can add below code for using parameters.

Terraform Code:

resource "aws_batch_job_definition" "test" {
  type          = "container"
  compute_environment = "my-compute-environment"
  container_properties = {
    image              = "your_container_image"
    command            = ["/bin/bash", "-c", "env | grep MY_COMMAND"]  # Access environment variable
    environment         = [{
      name  = "MY_COMMAND"
      value = "commandToRun"  # Set command as environment variable
    }]
  }
}
resource "aws_cloudwatch_event_target" "test_target" {
  # ... rest of the configuration remains the same ...
  input = jsonencode({
    Parameters = {
      # Reference the environment variable name
      resourceRequirements = {"resourceRequirements": [ ... ]}
    }
  })
}