Passing a map to a module

[Franck Ratier]

Hello,

I'm trying to update a module I have to setup lambda functions with a variable number of environment variables (via the variables attribute of the aws_lambda_function resource), but I can't figure out the right syntax to pass a map to a module.

Is this possible? Has anyone an example of how this should be done?

Thanks,

Franck

[Brian Lalor]

I do it; something like this should work:

variable "ami-cluster-base" {

    type = "map"

    default = {

        us-west-2 = "ami-deadbeef"

    }

}

module "environment" {

    source = "../tf-environment"

    ami-cluster-base = "${var.ami-cluster-base}"

}

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Brian Lalor

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[Franck Ratier]

Thank you for your reply, Brian.

At the moment what I do is the following, and I'm wondering if there's a more generic way to do it:

./modules/lambda_function/main.tf

variable "env_var1" { default = "" }
variable "env_var2" { default = "" }
variable "env_var3" { default = "" }

resource "aws_lambda_function" "mod" {
  ...
  environment {
    variables {
        LAMBDA_ENV_VAR1 = "${var.env_var1}"
        LAMBDA_ENV_VAR2 = "${var.env_var2}"
        LAMBDA_ENV_VAR3 = "${var.env_var3}"
    }
 }
}

./my_service.tf

module "my_service_slack_notification" {
  source        = "modules/lambda_function"
  ...
  env_var1      = "${var.slack_encrypted_hook_url}"
  env_var2      = "${var.slack_channel}"
}

So as you see I'm setting 3 environment variables when defining the module and when using it I can make use of some or all of them.

Since "variables" is a map I was wondering if I could pass it directly to the module without having to use these extra variables.

Franck

[Khalid Hosein]

Hello Franck,

Yup, I think if you extrapolate on Brian's example, you might get this sort of thing:

./modules/lambda_function/main.tf

variable "lambda_env_vars" { type = "map" }



resource "aws_lambda_function" "mod" {
  ...
  environment {


    variables = "${var.lambda_env_vars}"
  }
}

and in ./my_service.tf

module "my_service_slack_notification" {
  source        = "modules/lambda_function"
  ...

  env_vars      = "${var.slack_env_vars}"
}

variable "slack_env_vars" {
  type = "map"
  default = {
    env_var1 = "foo"
    env_var2 = "bar"
  }
}

Hope this helps!

-- Khalid

[Franck Ratier]

Fantastic! Yes it helps, problem solved, thank you to both of you!

Franck