如何有条件地启用/禁用GCP存储桶的lifecycle_rule

Question

在我的模块中，我想根据是否设置了变量来启用或禁用gcp存储桶lifecycle_rule，因此基本上我希望某些存储桶启用规则，而其他存储桶则忽略规则设置。但是terraform没有对GCP lifecycle_rule的支持enabled，而该支持很容易做到（请查看下面的AWS链接）。

AWS：https://www.terraform.io/docs/providers/aws/r/s3_bucket.html#enabled-1

GCP： https://www.terraform.io/docs/providers/google/r/storage_bucket.html#lifecycle_rule

我尝试有条件地将规则的操作类型和storage_class设置为“”

    resource "google_storage_bucket" "bucket_ageoff" {
      count = "${var.enable_ageoff}"

      name     = "${local.bucket_name}"
      project  = "${local.project_id}"
      location = "${var.region}"

      storage_class = "${local.bucket_storage_class}"

      encryption {
        default_kms_key_name = "${google_kms_crypto_key.bucket_key.self_link}"
      }

      logging {
        log_bucket = "${google_storage_bucket.log_bucket.name}"
      }

      labels {
        "environment" = "${var.env}"
      }

      lifecycle_rule {
        action {
          type = "Delete"
        }

        condition {
          age = "${var.ageoff_days}"
        }
      }

      lifecycle_rule {
        action {
          type = "${var.coldline_days != ""  ? "SetStorageClass" : ""}"
          storage_class = "${var.coldline_days != ""  ? "COLDLINE" : ""}"
        }

        condition {
          age = "${var.coldline_days != "" ? var.coldline_days : "0"}"
        }
      }

      }
    }

但是gcp api会出现此错误：

发生1个错误：

• module.log_archive_bucket.google_storage_bucket.bucket_ageoff：发生1个错误：

• google_storage_bucket.bucket_ageoff：googleapi：错误400：无效的参数，无效

以下是代码实际尝试执行的操作：

      ...
      lifecycle_rule {
        //enabled is supported by TF for AWS but not GCP
        //enabled = "${var.coldline_days != "" ? true : false }"

        action {
          type = "SetStorageClass"
          storage_class = "COLDLINE"
        }

        condition {
          age = "${var.coldline_days != "" ? var.coldline_days : "0" }"
        }

      }
    }

错误：module.log_archive_bucket.google_storage_bucket.bucket_ageoff：lifecycle_rule.1：无效或未知密钥：已启用

任何实现上述要求的想法都值得赞赏。