terraform_sns_email.tf

locals {
  monitoring_emails = [
    "user1@example.com",
    "user2@example.com"
  ]
}

resource "aws_sns_topic" "monitoring" {
  name = "monitoring"
}

resource "null_resource" "monitoring-email-subscription" {
  count = length(local.monitoring_emails)

  triggers = {
    email   = local.monitoring_emails[count.index]
    sns_arn = aws_sns_topic.monitoring.arn
  }

  provisioner "local-exec" {
    command = "aws sns subscribe --topic-arn ${self.triggers.sns_arn} --protocol email --notification-endpoint ${self.triggers.email}"
  }

  provisioner "local-exec" {
    when    = destroy
    command = "aws sns unsubscribe --subscription-arn $(aws sns list-subscriptions-by-topic --topic-arn ${self.triggers.sns_arn} --query 'Subscriptions[?Endpoint == `${self.triggers.email}`].SubscriptionArn' --out text)"
  }
}