Variable and output refactoring

README.md

@@ -27,23 +27,23 @@ Truefoundry Azure Network Module
 |------|------|
 | [azurerm_private_dns_zone.postgres_dns](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/private_dns_zone) | resource |
 | [azurerm_private_dns_zone_virtual_network_link.postgres_dns_link](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/private_dns_zone_virtual_network_link) | resource |
+| [azurerm_virtual_network.vnet](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/data-sources/virtual_network) | data source |
 
 ## Inputs
 
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
-| <a name="input_cluster_name"></a> [cluster\_name](#input\_cluster\_name) | AWS EKS cluster name needed for Shared cluster | `string` | n/a | yes |
+| <a name="input_cluster_name"></a> [cluster\_name](#input\_cluster\_name) | Cluster name to generate the virtual network name | `string` | n/a | yes |
 | <a name="input_control_plane_enabled"></a> [control\_plane\_enabled](#input\_control\_plane\_enabled) | Flag to check Control plane enabled | `bool` | n/a | yes |
-| <a name="input_location"></a> [location](#input\_location) | Vnet region | `string` | n/a | yes |
+| <a name="input_location"></a> [location](#input\_location) | Location to create the vnet | `string` | n/a | yes |
 | <a name="input_resource_group_name"></a> [resource\_group\_name](#input\_resource\_group\_name) | Azure Resource Group | `string` | n/a | yes |
-| <a name="input_shim"></a> [shim](#input\_shim) | If true will not create the network and forward the input values to the same outputs. | `bool` | `false` | no |
-| <a name="input_shim_vnet_name"></a> [shim\_vnet\_name](#input\_shim\_vnet\_name) | Vnet name for the shim network | `string` | `""` | no |
 | <a name="input_subnet_cidr"></a> [subnet\_cidr](#input\_subnet\_cidr) | Assigns IPv4 subnet | `string` | n/a | yes |
-| <a name="input_subnet_id"></a> [subnet\_id](#input\_subnet\_id) | SHIM: Subnet ID | `string` | n/a | yes |
+| <a name="input_subnet_id"></a> [subnet\_id](#input\_subnet\_id) | Subnet ID. Used only when use\_existing\_vnet is enabled | `string` | n/a | yes |
 | <a name="input_tags"></a> [tags](#input\_tags) | AWS Tags common to all the resources created | `map(string)` | `{}` | no |
+| <a name="input_use_existing_vnet"></a> [use\_existing\_vnet](#input\_use\_existing\_vnet) | Flag to enable existing network | `bool` | `false` | no |
 | <a name="input_use_for_each"></a> [use\_for\_each](#input\_use\_for\_each) | Use `for_each` instead of `count` to create multiple resource instances. | `bool` | `false` | no |
 | <a name="input_vnet_cidr"></a> [vnet\_cidr](#input\_vnet\_cidr) | The CIDR block for the VPC. | `string` | n/a | yes |
-| <a name="input_vnet_id"></a> [vnet\_id](#input\_vnet\_id) | SHIM: VPC Id | `string` | n/a | yes |
+| <a name="input_vnet_id"></a> [vnet\_id](#input\_vnet\_id) | VPC ID. Used only when use\_existing\_vnet is enabled | `string` | n/a | yes |
 
 ## Outputs
 
@@ -52,6 +52,8 @@ Truefoundry Azure Network Module
 | <a name="output_db_private_dns_zone_id"></a> [db\_private\_dns\_zone\_id](#output\_db\_private\_dns\_zone\_id) | n/a |
 | <a name="output_subnet_id"></a> [subnet\_id](#output\_subnet\_id) | n/a |
 | <a name="output_vnet_address_space"></a> [vnet\_address\_space](#output\_vnet\_address\_space) | n/a |
+| <a name="output_vnet_end_ip_address"></a> [vnet\_end\_ip\_address](#output\_vnet\_end\_ip\_address) | n/a |
 | <a name="output_vnet_id"></a> [vnet\_id](#output\_vnet\_id) | n/a |
 | <a name="output_vnet_name"></a> [vnet\_name](#output\_vnet\_name) | n/a |
+| <a name="output_vnet_start_ip_address"></a> [vnet\_start\_ip\_address](#output\_vnet\_start\_ip\_address) | n/a |
 <!-- END_TF_DOCS -->

data.tf

@@ -0,0 +1,5 @@
+data "azurerm_virtual_network" "vnet" {
+  count               = var.use_existing_vnet ? 1 : 0
+  name                = local.vnet_name
+  resource_group_name = var.resource_group_name
+}

locals.tf

@@ -1,5 +1,5 @@
 locals {
-  vnet_name = var.shim ? var.shim_vnet_name : "${var.cluster_name}-vnet"
+  vnet_name = var.use_existing_vnet ? element(split("/", var.vnet_id), length(split("/", var.vnet_id)) - 1) : "${var.cluster_name}-vnet"
   tags = merge(
     {
       "terraform-module" = "terraform-azure-truefoundry-network"

output.tf

@@ -3,20 +3,28 @@
 ####################################################################################
 
 output "vnet_id" {
-  value = var.shim ? var.vnet_id : module.vnet[0].vnet_id
+  value = var.use_existing_vnet ? var.vnet_id : module.vnet[0].vnet_id
 }
 
 output "vnet_name" {
   value = local.vnet_name
 }
 output "vnet_address_space" {
-  value = var.shim ? [] : module.vnet[0].vnet_address_space
+  value = var.use_existing_vnet ? [] : module.vnet[0].vnet_address_space
 }
 
 output "subnet_id" {
-  value = var.shim ? var.subnet_id : module.vnet[0].vnet_subnets[0]
+  value = var.use_existing_vnet ? var.subnet_id : module.vnet[0].vnet_subnets[0]
 }
 
 output "db_private_dns_zone_id" {
   value = var.control_plane_enabled ? azurerm_private_dns_zone.postgres_dns[0].id : ""
+}
+
+output "vnet_start_ip_address" {
+  value = var.use_existing_vnet ? cidrhost(data.azurerm_virtual_network.vnet[0].address_space[0], 0) : cidrhost(var.vnet_cidr, 0)
+}
+
+output "vnet_end_ip_address" {
+  value = var.use_existing_vnet ? cidrhost(data.azurerm_virtual_network.vnet[0].address_space[0], -1) : cidrhost(var.vnet_cidr, -1)
 }

variables.tf

@@ -1,29 +1,31 @@
 ##################################################################################
-## Variables
+## Existing network
 ##################################################################################
-variable "shim" {
-  description = "If true will not create the network and forward the input values to the same outputs."
+variable "use_existing_vnet" {
+  description = "Flag to enable existing network"
   type        = bool
   default     = false
 }
-### Shim
-
 variable "vnet_id" {
-  description = "SHIM: VPC Id"
+  description = "VPC ID. Used only when use_existing_vnet is enabled"
   type        = string
+  validation {
+    condition     = length(var.vnet_id) == "" || var.use_existing_vnet
+    error_message = "Vnet ID can't be empty if use_existing_vnet is enabled"
+  }
 }
 variable "subnet_id" {
-  description = "SHIM: Subnet ID"
-  type        = string
-}
-
-variable "shim_vnet_name" {
-  description = "Vnet name for the shim network"
+  description = "Subnet ID. Used only when use_existing_vnet is enabled"
   type        = string
-  default     = ""
+  validation {
+    condition     = length(var.subnet_id) == "" || var.use_existing_vnet
+    error_message = "Subnet ID can't be empty if use_existing_vnet is enabled"
+  }
 }
 
-### Non shim
+##################################################################################
+## New network
+##################################################################################
 variable "vnet_cidr" {
   description = "The CIDR block for the VPC."
   type        = string
@@ -45,18 +47,21 @@ variable "use_for_each" {
   type        = bool
 }
 
+##################################################################################
+## Common
+##################################################################################
 variable "resource_group_name" {
   description = "Azure Resource Group"
   type        = string
 }
 
 variable "cluster_name" {
-  description = "AWS EKS cluster name needed for Shared cluster"
+  description = "Cluster name to generate the virtual network name"
   type        = string
 }
 
 variable "location" {
-  description = "Vnet region"
+  description = "Location to create the vnet"
   type        = string
 }
 

vnet.tf

@@ -2,7 +2,7 @@
 # RESOURCES
 #############################################################################
 module "vnet" {
-  count   = var.shim ? 0 : 1
+  count   = var.use_existing_vnet ? 0 : 1
   source  = "Azure/vnet/azurerm"
   version = "4.1.0"
 
@@ -27,6 +27,6 @@ resource "azurerm_private_dns_zone_virtual_network_link" "postgres_dns_link" {
   count                 = var.control_plane_enabled ? 1 : 0
   name                  = "${replace(local.vnet_name, "-", "")}VnetZone.com"
   private_dns_zone_name = azurerm_private_dns_zone.postgres_dns[0].name
-  virtual_network_id    = var.shim ? var.vnet_id : module.vnet[0].vnet_id
+  virtual_network_id    = var.use_existing_vnet ? var.vnet_id : module.vnet[0].vnet_id
   resource_group_name   = var.resource_group_name
 }