feat: add snapshot_arns_to_restore for serverless ElastiCache (#252)

* [CloudPose Terraform Module] feat: Add snapshot_arns_to_restore for serverless ElastiCache

[PS-1]

- Added new variable snapshot_arns_to_restore
- Updated README
- Added same variable to serverless example as well
- Fixed EOL for files

Signed-off-by: muhammadasgharaliqureshi <[email protected]>

* Reformatted serverless example main.tf file

* Fixed README style for new variable

* Addressed feedbacks: Updated variable description

---------

Signed-off-by: muhammadasgharaliqureshi <[email protected]>
Co-authored-by: asghar.qureshi <[email protected]>

README.md

@@ -296,6 +296,7 @@ Available targets:
 | <a name="input_user_group_ids"></a> [user\_group\_ids](#input\_user\_group\_ids) | User Group ID to associate with the replication group | `list(string)` | `null` | no |
 | <a name="input_vpc_id"></a> [vpc\_id](#input\_vpc\_id) | VPC ID | `string` | n/a | yes |
 | <a name="input_zone_id"></a> [zone\_id](#input\_zone\_id) | Route53 DNS Zone ID as list of string (0 or 1 items). If empty, no custom DNS name will be published.<br/>If the list contains a single Zone ID, a custom DNS name will be pulished in that zone.<br/>Can also be a plain string, but that use is DEPRECATED because of Terraform issues. | `any` | `[]` | no |
+| <a name="input_serverless_snapshot_arns_to_restore"></a> [serverless_snapshot_arns_to_restore](#input\_serverless\_snapshot\_arns\_to\_restore) | The list of ARN(s) of the snapshot that the new serverless cache will be created from. Available for Redis only. | `list(string)` | `[]` | no |
 
 ## Outputs
 

examples/serverless/fixtures.us-east-2.tfvars

@@ -26,4 +26,3 @@ serverless_cache_usage_limits = {
 at_rest_encryption_enabled = false
 
 zone_id = "Z3SO0TKDDQ0RGG"
-

examples/serverless/main.tf

@@ -44,15 +44,15 @@ module "cloudwatch_logs" {
 module "redis" {
   source = "../../"
 
-  serverless_enabled              = var.serverless_enabled
-  zone_id                         = [aws_route53_zone.private.id]
-  vpc_id                          = module.vpc.vpc_id
-  allowed_security_groups         = [module.vpc.vpc_default_security_group_id]
-  subnets                         = module.subnets.private_subnet_ids
-  serverless_major_engine_version = var.serverless_major_engine_version
-  at_rest_encryption_enabled      = var.at_rest_encryption_enabled
-  serverless_cache_usage_limits   = var.serverless_cache_usage_limits
-
+  serverless_enabled                  = var.serverless_enabled
+  zone_id                             = [aws_route53_zone.private.id]
+  vpc_id                              = module.vpc.vpc_id
+  allowed_security_groups             = [module.vpc.vpc_default_security_group_id]
+  subnets                             = module.subnets.private_subnet_ids
+  serverless_major_engine_version     = var.serverless_major_engine_version
+  at_rest_encryption_enabled          = var.at_rest_encryption_enabled
+  serverless_cache_usage_limits       = var.serverless_cache_usage_limits
+  serverless_snapshot_arns_to_restore = var.serverless_snapshot_arns_to_restore
   # Verify that we can safely change security groups (name changes forces new SG)
   security_group_create_before_destroy = true
   security_group_name                  = length(var.sg_name) > 0 ? [var.sg_name] : []

examples/serverless/outputs.tf

@@ -41,4 +41,4 @@ output "serverless_host" {
 output "serverless_enabled" {
   value       = module.redis.serverless_enabled
   description = "Indicates if serverless mode is enabled"
-}
+}

examples/serverless/variables.tf

@@ -33,4 +33,10 @@ variable "sg_name" {
   type        = string
   default     = ""
   description = "Name to give to created security group"
-}
+}
+
+variable "serverless_snapshot_arns_to_restore" {
+  type        = list(string)
+  default     = []
+  description = "The list of ARN(s) of the snapshot that the new serverless cache will be created from. Available for Redis only."
+}

main.tf

@@ -234,6 +234,7 @@ resource "aws_elasticache_serverless_cache" "default" {
   security_group_ids = local.create_security_group ? concat(local.associated_security_group_ids, [module.aws_security_group.id]) : local.associated_security_group_ids
 
   daily_snapshot_time      = var.serverless_snapshot_time
+  snapshot_arns_to_restore = var.serverless_snapshot_arns_to_restore
   description              = coalesce(var.description, module.this.id)
   major_engine_version     = var.serverless_major_engine_version
   snapshot_retention_limit = var.snapshot_retention_limit

variables.tf

@@ -328,3 +328,9 @@ variable "serverless_cache_usage_limits" {
   default     = {}
   description = "The usage limits for the serverless cache"
 }
+
+variable "serverless_snapshot_arns_to_restore" {
+  type        = list(string)
+  default     = []
+  description = "The list of ARN(s) of the snapshot that the new serverless cache will be created from. Available for Redis only."
+}