Add support loadbalancer capacity reservation (#201)

* support loadbalancer capacity reservation

* fix fmt

Author: y3ti

README.md

@@ -157,13 +157,13 @@ module "alb" {
 | Name | Version |
 |------|---------|
 | <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 1.3 |
-| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 5.46 |
+| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 5.99 |
 
 ## Providers
 
 | Name | Version |
 |------|---------|
-| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 5.46 |
+| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 5.99 |
 
 ## Modules
 
@@ -263,6 +263,7 @@ module "alb" {
 | <a name="input_noncurrent_version_transition_days"></a> [noncurrent\_version\_transition\_days](#input\_noncurrent\_version\_transition\_days) | (Deprecated, use `lifecycle_configuration_rules` instead)<br/>Specifies (in days) when noncurrent object versions transition to Glacier Flexible Retrieval | `number` | `30` | no |
 | <a name="input_preserve_host_header"></a> [preserve\_host\_header](#input\_preserve\_host\_header) | Indicates whether the Application Load Balancer should preserve the Host header in the HTTP request and send it to the target without any change. | `bool` | `false` | no |
 | <a name="input_regex_replace_chars"></a> [regex\_replace\_chars](#input\_regex\_replace\_chars) | Terraform regular expression (regex) string.<br/>Characters matching the regex will be removed from the ID elements.<br/>If not set, `"/[^a-zA-Z0-9-]/"` is used to remove all characters other than hyphens, letters and digits. | `string` | `null` | no |
+| <a name="input_reserved_capacity_units"></a> [reserved\_capacity\_units](#input\_reserved\_capacity\_units) | The number of capacity units reserved for the load balancer | `number` | `null` | no |
 | <a name="input_security_group_enabled"></a> [security\_group\_enabled](#input\_security\_group\_enabled) | Enables the security group | `bool` | `true` | no |
 | <a name="input_security_group_ids"></a> [security\_group\_ids](#input\_security\_group\_ids) | A list of additional security group IDs to attach to the ALB | `list(string)` | `[]` | no |
 | <a name="input_slow_start"></a> [slow\_start](#input\_slow\_start) | The amount of time (30-900 seconds) until a healthy target receives its full share of requests from the load balancer. 0 to disable. | `number` | `null` | no |

main.tf

@@ -128,6 +128,13 @@ resource "aws_lb" "default" {
     prefix  = var.access_logs_prefix
     enabled = var.access_logs_enabled
   }
+
+  dynamic "minimum_load_balancer_capacity" {
+    for_each = var.reserved_capacity_units == null ? [] : [var.reserved_capacity_units]
+    content {
+      capacity_units = minimum_load_balancer_capacity.value
+    }
+  }
 }
 
 module "default_target_group_label" {

variables.tf

@@ -426,3 +426,9 @@ variable "client_keep_alive" {
   default     = 3600
   description = "Client keep alive value in seconds. The valid range is 60-604800 seconds. The default is 3600 seconds."
 }
+
+variable "reserved_capacity_units" {
+  type        = number
+  default     = null
+  description = "The number of capacity units reserved for the load balancer"
+}

versions.tf

@@ -4,7 +4,7 @@ terraform {
   required_providers {
     aws = {
       source  = "hashicorp/aws"
-      version = ">= 5.46"
+      version = ">= 5.99"
     }
   }
 }