feat: Enable integration with multiple LBs (#297)

* feat: Enable integration with multiple load balancers

* feat: Make container_port optional

* docs: Generate README

Author: jwadolowski

README.md

@@ -154,6 +154,7 @@ Available targets:
 
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
+| <a name="input_additional_lbs"></a> [additional\_lbs](#input\_additional\_lbs) | List of additional load balancer configurations. Each config should specify container\_name (optional), container\_port (optional, defaults to main container\_port), and target\_group\_arn | <pre>list(object({<br/>    container_name   = optional(string)<br/>    container_port   = optional(number)<br/>    target_group_arn = string<br/>  }))</pre> | `[]` | no |
 | <a name="input_additional_tag_map"></a> [additional\_tag\_map](#input\_additional\_tag\_map) | Additional key-value pairs to add to each map in `tags_as_list_of_maps`. Not added to `tags` or `id`.<br/>This is for some rare cases where resources want additional configuration of tags<br/>and therefore take a list of maps with tag key, value, and additional configuration. | `map(string)` | `{}` | no |
 | <a name="input_alb_arn_suffix"></a> [alb\_arn\_suffix](#input\_alb\_arn\_suffix) | ARN suffix of the ALB for the Target Group | `string` | `""` | no |
 | <a name="input_alb_container_name"></a> [alb\_container\_name](#input\_alb\_container\_name) | The name of the container to associate with the ALB. If not provided, the generated container will be used | `string` | `null` | no |

docs/terraform.md

@@ -37,6 +37,7 @@
 
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
+| <a name="input_additional_lbs"></a> [additional\_lbs](#input\_additional\_lbs) | List of additional load balancer configurations. Each config should specify container\_name (optional), container\_port (optional, defaults to main container\_port), and target\_group\_arn | <pre>list(object({<br/>    container_name   = optional(string)<br/>    container_port   = optional(number)<br/>    target_group_arn = string<br/>  }))</pre> | `[]` | no |
 | <a name="input_additional_tag_map"></a> [additional\_tag\_map](#input\_additional\_tag\_map) | Additional key-value pairs to add to each map in `tags_as_list_of_maps`. Not added to `tags` or `id`.<br/>This is for some rare cases where resources want additional configuration of tags<br/>and therefore take a list of maps with tag key, value, and additional configuration. | `map(string)` | `{}` | no |
 | <a name="input_alb_arn_suffix"></a> [alb\_arn\_suffix](#input\_alb\_arn\_suffix) | ARN suffix of the ALB for the Target Group | `string` | `""` | no |
 | <a name="input_alb_container_name"></a> [alb\_container\_name](#input\_alb\_container\_name) | The name of the container to associate with the ALB. If not provided, the generated container will be used | `string` | `null` | no |

main.tf

@@ -125,7 +125,22 @@ locals {
     elb_name         = null
     target_group_arn = var.nlb_ingress_target_group_arn
   }
-  load_balancers = var.nlb_ingress_target_group_arn != "" ? [local.alb, local.nlb] : [local.alb]
+
+  additional_lbs = [
+    for config in var.additional_lbs : {
+      container_name   = config.container_name != null ? config.container_name : module.this.id
+      container_port   = config.container_port != null ? config.container_port : var.container_port
+      elb_name         = null
+      target_group_arn = config.target_group_arn
+    }
+  ]
+
+  load_balancers = concat(
+    [local.alb],
+    var.nlb_ingress_target_group_arn != "" ? [local.nlb] : [],
+    local.additional_lbs
+  )
+
   init_container_definitions = [
     for init_container in var.init_containers : init_container["container_definition"]
   ]

variables.tf

@@ -1141,3 +1141,13 @@ variable "circuit_breaker_rollback_enabled" {
   description = "If `true`, Amazon ECS will roll back the service if a service deployment fails"
   default     = false
 }
+
+variable "additional_lbs" {
+  type = list(object({
+    container_name   = optional(string)
+    container_port   = optional(number)
+    target_group_arn = string
+  }))
+  description = "List of additional load balancer configurations. Each config should specify container_name (optional), container_port (optional, defaults to main container_port), and target_group_arn"
+  default     = []
+}