OpenShiftP-247: add loadbalancer logic into terraform

Signed-off-by: Paul Bastide <pbastide@us.ibm.com>

.gitignore

@@ -1,4 +1,5 @@
 # Local .terraform directories
+_debug
 **/.terraform/*
 _scratch
 

modules/1_vpc_support/find_lbs.tf

@@ -0,0 +1,52 @@
+################################################################
+# Copyright 2025 - IBM Corporation. All rights reserved
+# SPDX-License-Identifier: Apache-2.0
+################################################################
+
+# ibm_is_lbs - https://registry.terraform.io/providers/IBM-Cloud/ibm/latest/docs/data-sources/is_lb#private_ip-6
+# in the resource provider that uses this data, we must add `lifecycle { ignore_changes = all }`
+
+data "ibm_resource_group" "group" {
+  name = data.ibm_is_vpc.vpc.resource_group_name
+}
+
+# only get the subnets in the vpc
+data "ibm_is_subnets" "subnets" {
+  vpc = data.ibm_is_vpc.vpc.id
+  resource_group = data.ibm_resource_group.group.id
+}
+
+# gets all lbs in the region
+data "ibm_is_lbs" "lbs" {
+    // Empty
+}
+
+locals {
+    subnets_used_in_vpc = [for sn in data.ibm_is_subnets.subnets.subnets: sn.id]
+
+    // Load Balancer Id
+    subnets_from_lbs_with_ips = flatten([
+        for lb in data.ibm_is_lbs.lbs.load_balancers: 
+            flatten([
+                for sn in lb.subnets[*]: 
+                    flatten([
+                        for snx in data.ibm_is_subnets.subnets.subnets:
+                            sn.id == snx.id && snx.vpc == data.ibm_is_vpc.vpc.id && length(lb.private_ip) > 0 ?
+                                [{
+                                    id = lb.id
+                                    lb_name = lb.name
+                                    sn = sn
+                                    vpc = data.ibm_is_vpc.vpc.id
+                                    private_ip = lb.private_ip[*].address
+                                }]
+                                : []
+                    ])
+            ])
+    ])
+
+    load_balancer_ips = distinct(flatten([for slip in local.subnets_from_lbs_with_ips:
+            !strcontains(slip.lb_name, "-api-")?
+            flatten(
+                [for pip in slip.private_ip: pip]):
+            []]))
+}

modules/1_vpc_support/outputs.tf

@@ -26,3 +26,8 @@ output "transit_gateway_name" {
 output "transit_gateway_status" {
   value = !var.setup_transit_gateway ? module.existing_gateway[0].existing_tg_status : module.transit_gateway[0].new_tg_status
 }
+
+// Highly unlikely this is empty or zero, best to throw an error
+output "load_balancer_ips" {
+  value = load_balancer_ips[0]
+}