I'm struggling to create a module with optional resources steered with "count" attribute.
Here is a project which demonstrates the problem.
There is an SQS module which has optional dead-letter queue attached with SQS redrive policy.
On first run when queue is created with DLQ everything is fine, but when I wanted to remove DLQ the issue appears when terraform plan
is running:
Error: Invalid index
on modules/sqs/sqs.tf line 67, in resource "aws_sqs_queue" "regular_queue_with_dl":
67: redrive_policy = var.attach_dead_letter_config ? data.template_file.regular_queue_redrive_policy[count.index].rendered : null
|----------------
| count.index is 0
| data.template_file.regular_queue_redrive_policy is empty tuple
Does anyone know how to properly create such module with optional resource in Terraform 0.12 or fix the issue I am facing?
EDIT: I asked the same question on stackoverflow and got the answer which solved my problem.
The solution was to conditionally assign redrive_policy
to null
if Lamdba should not use it, e.g.:
resource "aws_sqs_queue" "regular_queue" {
redrive_policy = var.attach_dead_letter_config ? templatefile(
"${path.module}/redrive_policy.tmpl", {
# (...whatever you had in "vars" in the template_file data resource...)
},
) : null
...
}
In addition we can inline template file instead of creating a separate resource.
My updated example is here
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