Terraform 预处理地形局部变量

我有一组TF局部变量，，，它使用了一些三元运算符，，，当我通过var.env stg时，它工作得很好

locals {
  allowed_roles = [
    "rqm-airflow-task-prd",
    "${var.env == "stg" ? "rqm-airflow-task-stg" : "" }",
    "rqm-airflow-task-rnd",
    "rqm-ecs-pag_mock-task-role-prd",
    "${var.env == "stg" ? "rqm-ecs-pag_mock-task-role-stg" : "" }"
}
data "aws_iam_role" "allowed_roles" {
  count = "${length(local.allowed_roles)}"
  name  = "${local.allowed_roles[count.index]}"
} 

但stg是一个动态的环境，并不总是持续存在， 因此，删除stg env时，三元运算符值变为空“”，代码将使用var.env重新运行，如“prd”所示，然后

data.aws_iam_role

失败

Error: Error refreshing state: 1 error occurred:
    * data.aws_iam_role.allowed_roles: 4 errors occurred:
    * data.aws_iam_role.allowed_roles[7]: data.aws_iam_role.allowed_roles.7: error reading IAM Role (): InvalidParameter: 1 validation error(s) found.
- minimum field size of 1, GetRoleInput.RoleName.
    * data.aws_iam_role.allowed_roles[1]: data.aws_iam_role.allowed_roles.1: error reading IAM Role (): InvalidParameter: 1 validation error(s) found.
- minimum field size of 1, GetRoleInput.RoleName.

---

有没有办法对其进行预处理？

看起来您需要的是：

compact

获取字符串列表并返回一个新列表，其中删除了所有空字符串元素

locals {
  allowed_roles = compact([
    "rqm-airflow-task-prd",
    var.env == "stg" ? "rqm-airflow-task-stg" : "",
    "rqm-airflow-task-rnd",
    "rqm-ecs-pag_mock-task-role-prd",
    var.env == "stg" ? "rqm-ecs-pag_mock-task-role-stg" : "",
  ])
}