[Bug Report] <Unable to execute plan successfully upon module asg.>

[Karatonev]

Describe the bug

I am trying to use the ASG module.
The invocation of the module is as follows:

module "paloalto" {
source = "../../../terraform-aws-swfw-modules/modules/asg"
ssh_key_name = "paloalto"
interfaces = {
mgmt = {
device_index = 0
subnet_id = "subnet-xxxxxxxxxxxxxxxxxxx"
name = "mgmt"
create_public_ip = true
source_dest_check = true
security_group_ids = ["sg-xxxxxxxxxxxxxxx"]
},
public = {
device_index = 1
subnet_id = "subnet-xxxxxxxxxxxxxxxxxxx"
name = "public"
create_public_ip = true
source_dest_check = true
security_group_ids = ["sg-xxxxxxxxxxxxxxx"]
},
private = {
device_index = 2
subnet_id = "subnet-xxxxxxxxxxxxxxxxxxx"
name = "private"
create_public_ip = false
source_dest_check = true
security_group_ids = ["sg-xxxxxxxxxxxxxxx"]
}
}
global_tags = {}
region="eu-west-1"
name_prefix = "palo-alto-test"
target_group_arn = aws_lb_target_group.this.arn

}

I stumbled across the following:

default_eni_subnet_names = flatten([for k, v in var.interfaces : v.subnet_id if v.device_index == 0]) //Line 29

This is going to produce a list.

Then this:
subnet_id = values(local.default_eni_subnet_names[0])[0] // Line 72

Module Version

2.0.16

Terraform version

Terraform v1.9.7

Expected behavior

Run terraform plan successfuly.

Current behavior

│ Error: Error in function call
│
│ on ......\terraform-aws-swfw-modules\modules\asg\main.tf line 72, in resource "aws_launch_template" "this":
│ 72: subnet_id = values(local.default_eni_subnet_names[0])[0]
│ ├────────────────
│ │ while calling values(mapping)
│ │ local.default_eni_subnet_names[0] is "subnet-027e04xxxxxx"
│
│ Call to function "values" failed: values() requires a map as the first argument.

Anything else to add?

No response

[acelebanski]

Hello @Karatonev, try passing a map to subnet_id where key is availability zone name and value is subnet id.

Like this:

subnet_id = {
  "eu-west-1a" = "sg-xxxxxxxxxxxxxxx"
}

If you're deploying in multiple AZs, you can add more keys to this map.