feat: added support to the DA solution to supply and existing EN instance using the existing_en_instance_crn input (#243)

Author: iamar7

solutions/standard/main.tf

@@ -120,9 +120,18 @@ locals {
   # KMS Related
   existing_kms_instance_crn = var.existing_kms_instance_crn != null ? var.existing_kms_instance_crn : null
   cos_endpoint              = var.existing_cos_bucket_name == null ? "https://${module.cos[0].s3_endpoint_public}" : var.existing_cos_endpoint
+  # Event Notification Related
+  parsed_existing_en_instance_crn = var.existing_en_instance_crn != null ? split(":", var.existing_en_instance_crn) : []
+  existing_en_guid                = length(local.parsed_existing_en_instance_crn) > 0 ? local.parsed_existing_en_instance_crn[7] : null
+}
+
+data "ibm_resource_instance" "existing_en" {
+  count      = var.existing_en_instance_crn == null ? 0 : 1
+  identifier = var.existing_en_instance_crn
 }
 
 module "event_notifications" {
+  count                    = var.existing_en_instance_crn != null ? 0 : 1
   source                   = "../.."
   resource_group_id        = module.resource_group.resource_group_id
   region                   = var.region

solutions/standard/moved.tf

@@ -2,3 +2,8 @@ moved {
   from = module.cos
   to   = module.cos[0]
 }
+
+moved {
+  from = module.event_notifications
+  to   = module.event_notifications[0]
+}

solutions/standard/outputs.tf

@@ -4,27 +4,27 @@
 
 output "event_notification_instance_name" {
   description = "Event Notification name"
-  value       = module.event_notifications.event_notification_instance_name
+  value       = var.existing_en_instance_crn == null ? module.event_notifications[0].event_notification_instance_name : data.ibm_resource_instance.existing_en[0].name
 }
 
 output "crn" {
   description = "Event Notification crn"
-  value       = module.event_notifications.crn
+  value       = var.existing_en_instance_crn == null ? module.event_notifications[0].crn : var.existing_en_instance_crn
 }
 
 output "guid" {
   description = "Event Notification guid"
-  value       = module.event_notifications.guid
+  value       = var.existing_en_instance_crn == null ? module.event_notifications[0].guid : local.existing_en_guid
 }
 
 output "service_credentials_json" {
   description = "Service credentials json map"
-  value       = module.event_notifications.service_credentials_json
+  value       = var.existing_en_instance_crn == null ? module.event_notifications[0].service_credentials_json : null
   sensitive   = true
 }
 
 output "service_credentials_object" {
   description = "Service credentials object"
-  value       = module.event_notifications.service_credentials_object
+  value       = var.existing_en_instance_crn == null ? module.event_notifications[0].service_credentials_object : null
   sensitive   = true
 }

solutions/standard/variables.tf

@@ -86,6 +86,12 @@ variable "tags" {
   default     = []
 }
 
+variable "existing_en_instance_crn" {
+  type        = string
+  description = "The CRN of existing event notification instance. If not supplied, a new instance is created."
+  default     = null
+}
+
 ########################################################################################################################
 # KMS
 ########################################################################################################################