Terraform conditional block inside a map

Question

I have an aws_lambda_function resource like below:

resource "aws_lambda_function" "mylambda" {
#...

environment {
    variables = {
        FOO = 1
    }
}


}

I'm tring to add some environment variables dynamically based on my var.enable_vars

variable "enable_vars" {
  type        = bool
  default     = false
}
resource "aws_lambda_function" "mylambda" {
#...

environment {
    variables = {
        FOO = 1
#### if var.enable_vars == true
#       BAR = 2
#       BAZ = 3
    }
}


}

How to achieve that? Is not clear to me if a dynamic block can be used there.

You could set the environment variables in the code itself from a file conditionally based on one variable set during the build time — jabbson, Oct 19 '22 at 16:26
you could have your environment variables stored in the .env files, uploaded along with the code and then loaded during execution. Also you could use ternary operator, if setting BAR = 0 or -1 could mean the same as not being set within your app logic. — jabbson, Oct 19 '22 at 21:11

score 3 · Accepted Answer · answered Oct 31 '22 at 08:10

This could be done with a dynamic block but its pretty complicated. This is how I would do it but there are other ways.

variable "enable_vars" {
  type        = bool
  default     = false
}
locals {
  default_lambda_vars = {
    FOO = 1
  }
  extra_vars = {
    BAR = 2
    BAZ = 3
  }
final_lambda_vars = var.enable_vars ? merge(local.default_lambda_vars, local.extra_vars) : local.default_lambda_vars
}
resource "aws_lambda_function" "mylambda" {
#...

environment {
    variables = local.final_lambda_vars
}


}

Terraform conditional block inside a map

1 Answers1