Terraform 在資源中創建一種或另一種塊類型

Question

我正在嘗試使用 Terraform 在 GCP 中創建警報策略，並且基於 boolean 值我想選擇是創建 condition_threshold 還是 conditionAbsent 類型的策略。 由於這些都是 google_monitoring_alert_policy 中的不同類型的塊，我無法找到一種方法來根據 boolean 值創建一個或另一個。

resource "google_monitoring_alert_policy" "logging_alert_policy" {
  for_each     = local.metrics_map
  project      = var.project
  display_name = lower(format("%s%s%s%s", join("_", [element(split("-", each.value.appcode), length(split("-", each.value.appcode)) - 1), element(split("-", each.value.appcode), 0)]), " ", "log_match ", each.value.display_name))

  combiner = each.value.how_to_trigger

  dynamic "conditions" {
    for_each = each.value.conditions

    content {
      display_name = lower(format("%s%s%s%s", join("_", [element(split("-", conditions.value.appcode), length(split("-", conditions.value.appcode)) - 1), element(split("-", conditions.value.appcode), 0)]), " ", "log_match ", conditions.value.display_name))

       

      # condition_threshold {

      #   filter = lower("metric.type=\"logging.googleapis.com/user/${format("%s%s%s%s", conditions.value.appcode, "-", lower(replace(lookup(conditions.value, "metric_name"), "/\\W|_|\\s/", "-")), "")}\" resource.type=\"${conditions.value.resource_type}\"")

      #   comparison      = conditions.value.comparison
      #   threshold_value = conditions.value.threshold_value
      #   duration        = conditions.value.duration

      #   trigger {
      #     count = lookup(conditions.value, "trigger_count", var.default_metric_alert["trigger_count"])
      #   }
      #   aggregations {
      #     alignment_period     = conditions.value.alignment_period
      #     per_series_aligner   = conditions.value.per_series_aligner
      #     cross_series_reducer = conditions.value.cross_series_reducer
      #     group_by_fields      = conditions.value.group_by_fields
      #   }
      # }

      condition_absent {
        
        aggregations {
          alignment_period     = "300s"
          per_series_aligner   = "ALIGN_MAX"
          cross_series_reducer = "REDUCE_MAX"
          group_by_fields      = ["resource.label.container_name"]
        }

        trigger {
          count = 1
        }

        duration        = "180s"

        filter = lower("metric.type=\"logging.googleapis.com/user/${format("%s%s%s%s", conditions.value.appcode, "-", lower(replace(lookup(conditions.value, "metric_name"), "/\\W|_|\\s/", "-")), "")}\" resource.type=\"${conditions.value.resource_type}\"")

      }

      
    }
  }

Answer 1

我會建議嵌套的動態塊依賴於一個元素的local計算集 - 或者沒有元素。

這個想法的簡短例子：

locals {
  absent = false  # let's say we want to have "condition_threshold" block if this is true 

  conditions_config        = local.absent == false ? ["1"] : []
  absent_conditions_config = local.absent == true ? ["1"] : []
 
  # I agree the above code is ugly but shows exactly the idea
}

# [...]

  dynamic "conditions" {
    for_each = each.value.conditions

    content {
      #[...]
       
      dynamic "condition_threshold" {
        for_each = toset(local.conditions_config)  # this will be one element if local.absent = false

        # content { ... } 
      }

      dynamic "condition_absent" {
        for_each = toset(local.absent_conditions_config) # this will be one element if local.absent = true

        # content { ... } 
      }