Add pricing to host module

Signed-off-by: Webster Mudge <[email protected]>

Author: wmudge

modules/hosts/examples/ex01-minimal_inputs/main.tf

@@ -19,6 +19,11 @@ provider "aws" {
   }
 }
 
+provider "aws" {
+  alias  = "cost_calculator"
+  region = "us-east-1"
+}
+
 # ------- VPC -------
 
 resource "aws_vpc" "ex01" {
@@ -50,7 +55,6 @@ resource "aws_vpc_dhcp_options_association" "ex01" {
 module "ex01_network" {
   source = "../../../network"
 
-  region = var.region
   prefix = var.prefix
   vpc_id = aws_vpc.ex01.id
 
@@ -79,6 +83,10 @@ resource "aws_vpc_security_group_ingress_rule" "ssh" {
 module "ex01_hosts" {
   source     = "../.."
   depends_on = [aws_key_pair.ex01, data.aws_ami.ex01]
+  providers  = {
+    aws = aws
+    aws.pricing_calculator = aws.cost_calculator
+  }
 
   name          = "${var.prefix}-host"
   quantity      = 2

modules/hosts/main.tf

@@ -18,10 +18,29 @@ terraform {
     aws = {
       source  = "hashicorp/aws",
       version = ">= 4.60.0",
+      configuration_aliases = [ aws.pricing_calculator ]
     }
   }
 }
 
+# provider "aws" {
+#   alias  = "cost_calculator"
+#   region = "us-east-1"
+# }
+
+locals {
+  pricing_os_map = {
+    "Red Hat Enterprise Linux" = "RHEL"
+    "Ubuntu"                   = "Linux"
+    "Linux/UNIX"               = "Linux"
+    # "Windows"                  = "Windows"
+  }
+  pricing_arch_map = {
+    "x86_64" = "64-bit"
+    "arm64"  = "ARM64"
+  }
+}
+
 data "aws_ami" "pvc_base" {
   filter {
     name   = "image-id"
@@ -55,3 +74,51 @@ resource "aws_instance" "pvc_base" {
     Name = var.quantity == 0 ? var.name : format("%s-%02d", var.name, count.index + var.offset + 1)
   })
 }
+
+data "aws_pricing_product" "pvc_base" {
+  for_each = { for idx, instance in aws_instance.pvc_base : idx => instance }
+
+  provider = aws.pricing_calculator
+
+  service_code = "AmazonEC2"
+
+  filters {
+    field = "instanceType"
+    value = each.value.instance_type
+  }
+
+  filters {
+    field = "regionCode"
+    value = each.value.region
+  }
+
+  filters {
+    field = "operatingSystem"
+    value = local.pricing_os_map[data.aws_ami.pvc_base.platform_details]
+  }
+
+  # filters {
+  #     field = "processorArchitecture"
+  #     value = local.pricing_arch_map[data.aws_ami.pvc_base.architecture]
+  # }
+
+  filters {
+      field = "marketoption"
+      value = "OnDemand" # TODO Review marketoption as a variable to the module
+  }
+
+  filters {
+    field = "preInstalledSw"
+    value = "NA"
+  }
+
+  filters {
+    field = "tenancy"
+    value = "Shared"
+  }
+
+  filters {
+      field = "capacitystatus"
+      value = "Used"
+  }
+}

modules/hosts/outputs.tf

@@ -20,4 +20,20 @@ output "hosts" {
 output "storage_volumes" {
   value       = local.attached_volumes_by_instance
   description = "Additional Storage Volumes"
-}
+}
+
+locals {
+  pvc_base_pricing_data = values(
+    values(
+      jsondecode(values(data.aws_pricing_product.pvc_base)[0].result).terms.OnDemand
+    )[0].priceDimensions
+  )[0]
+}
+
+output "pricing" {
+  description = "The hourly cost and details for each instance of this module."
+  value = {
+    price_per_hour    = local.pvc_base_pricing_data.pricePerUnit.USD
+    price_description = local.pvc_base_pricing_data.description
+  }
+}