feat: Default action forward action type (#269)

Co-authored-by: Anton Babenko <[email protected]>

Author: michaelact

examples/complete-alb/main.tf

@@ -76,6 +76,23 @@ module "alb" {
     {
       port        = 81
       protocol    = "HTTP"
+      action_type = "forward"
+      forward = {
+        target_groups = [
+          {
+            target_group_index = 0
+            weight             = 100
+          },
+          {
+            target_group_index = 1
+            weight             = 0
+          }
+        ]
+      }
+    },
+    {
+      port        = 82
+      protocol    = "HTTP"
       action_type = "redirect"
       redirect = {
         port        = "443"
@@ -84,7 +101,7 @@ module "alb" {
       }
     },
     {
-      port        = 82
+      port        = 83
       protocol    = "HTTP"
       action_type = "fixed-response"
       fixed_response = {

main.tf

@@ -629,7 +629,7 @@ resource "aws_lb_listener" "frontend_http_tcp" {
     # Defaults to forward action if action_type not specified
     content {
       type             = lookup(default_action.value, "action_type", "forward")
-      target_group_arn = contains([null, "", "forward"], lookup(default_action.value, "action_type", "")) ? aws_lb_target_group.main[lookup(default_action.value, "target_group_index", count.index)].id : null
+      target_group_arn = contains([null, ""], lookup(default_action.value, "action_type", "")) ? aws_lb_target_group.main[lookup(default_action.value, "target_group_index", count.index)].id : null
 
       dynamic "redirect" {
         for_each = length(keys(lookup(default_action.value, "redirect", {}))) == 0 ? [] : [lookup(default_action.value, "redirect", {})]
@@ -653,6 +653,30 @@ resource "aws_lb_listener" "frontend_http_tcp" {
           status_code  = lookup(fixed_response.value, "status_code", null)
         }
       }
+
+      dynamic "forward" {
+        for_each = length(keys(lookup(default_action.value, "forward", {}))) == 0 ? [] : [lookup(default_action.value, "forward", {})]
+
+        content {
+          dynamic "target_group" {
+            for_each = forward.value["target_groups"]
+
+            content {
+              arn    = aws_lb_target_group.main[target_group.value["target_group_index"]].id
+              weight = lookup(target_group.value, "weight", null)
+            }
+          }
+
+          dynamic "stickiness" {
+            for_each = length(keys(lookup(forward.value, "stickiness", {}))) == 0 ? [] : [lookup(forward.value, "stickiness", {})]
+
+            content {
+              enabled  = lookup(stickiness.value, "enabled", false)
+              duration = lookup(stickiness.value, "duration", 60)
+            }
+          }
+        }
+      }
     }
   }