[CI SKIP] Refactored project layout per Mark Wolfe Blog : https://www.wolfe.id.au/2020/03/10/how-do-i-structure-my-go-project/

assets/tfenv/_provider.tf

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+provider "aws" {
+	alias      = "us-west-2"
+	region     = "us-west-2"
+}
+
+provider "aws" {
+	alias      = "us-east-1"
+	region     = "us-east-1"
+}

assets/tfenv/cluster/subnets.tf

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+variable "vpc_id" {}
+
+data "aws_vpc" "selected" {
+	id                 = var.vpc_id
+}
+
+variable "regional_cidr_blocks" {
+	description = "A simple map of subnets used by region"
+	type        = map
+	default     = {
+		"us-west-2a-private" = "10.172.64.0/23",
+		"us-west-2b-private" = "10.172.66.0/23",
+		"us-west-2a-public"  = "10.172.68.0/26",
+		"us-west-2b-public"  = "10.172.68.64/26",
+		"us-east-1a-private" = "10.172.0.0/23",
+		"us-east-1b-private" = "10.172.2.0/23",
+		"us-east-1a-public"  = "10.172.4.0/26",
+		"us-east-1b-public"  = "10.172.4.64/26"
+	}
+}
+
+resource "aws_subnet" "aza-private" {
+	depends_on         = [data.aws_vpc.selected]
+	vpc_id             = data.aws_vpc.id
+	availability_zone  = format("%sa", var.region)
+	cidr_block         = var.regional_cidr_blocks[
+		format("%sa-private", var.region)
+	]
+	tags               = merge(
+		var.extra_tags,
+		{
+			Name = "aza-private"
+			tier = "private"
+		}
+	)
+}
+
+# resource "aws_subnet" "aza-public" {
+#   depends_on         = [data.aws_vpc.selected]
+#   vpc_id             = data.aws_vpc.selected.id
+#   availability_zone  = format("%sa", var.region)
+#   cidr_block         = var.regional_cidr_blocks[
+#     format("%sa-public", var.region)
+#   ]
+#   tags               = merge(
+#     var.extra_tags,
+#     {
+#       Name = "aza-public"
+#       tier = "public"
+#     }
+#   )
+# }
+# 
+# resource "aws_subnet" "azb-private" {
+#   depends_on         = [data.aws_vpc.selected]
+#   vpc_id             = data.aws_vpc.selected.id
+#   availability_zone  = format("%sb", var.region)
+#   cidr_block         = var.regional_cidr_blocks[
+#     format("%sb-private", var.region)
+#   ]
+#   tags               = merge(
+#     var.extra_tags,
+#     {
+#       Name = "azb-private"
+#       tier = "private"
+#     }
+#   )
+# }
+# 
+# resource "aws_subnet" "azb-public" {
+#   depends_on         = [data.aws_vpc.selected]
+#   vpc_id             = data.aws_vpc.selected.id
+#   availability_zone  = format("%sb", var.region)
+#   cidr_block         = var.regional_cidr_blocks[
+#     format("%sb-public", var.region)
+#   ]
+#   tags               = merge(
+#     var.extra_tags,
+#     {
+#       Name = "azb-public"
+#       tier = "public"
+#     }
+#   )
+# }

assets/tfenv/cluster/variables.tf

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+variable "extra_tags" {
+	description        = "Tags required on all resources"
+	type               = map
+	default            = {
+		"org"            = "dragonheim"
+		"service"        = "gagent"
+		"maintained_by"  = "jwells@dragonheim.net"
+	}
+}

assets/tfenv/cluster/vpc.tf

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+variable "region" {}
+variable "provider_alias" {}
+
+variable "regional_vpc_cidr" {
+	description = "A simple map of VPC subnets used by region"
+	type        = map
+	default     = {
+		"us-west-2" = "10.172.64.0/19",
+		"us-east-1" = "10.172.0.0/19",
+	}
+}
+
+resource "aws_vpc" "gagent" {
+	instance_tenancy   = "default"
+	enable_dns_support = true
+	cidr_block         = var.regional_vpc_cidr[var.region]
+	tags = merge(
+		var.extra_tags,
+		{
+			Name = "gagent"
+		}
+	)
+}

assets/tfenv/main.tf

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+# main.tf
+module "us-east-1" {
+  source    = "./cluster"
+  region    = "us-east-1"
+  provider_alias = "us-east-1"
+  providers = {
+    aws = "aws.us-east-1"
+  }
+}
+
+module "us-west-2" {
+  source    = "./cluster"
+  region    = "us-west-2"
+  provider_alias = "us-west-2"
+  providers = {
+    aws = "aws.us-west-2"
+  }
+}

assets/tfenv/terraform.tf

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+terraform {
+  required_version = ">= 1.0.7"
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = "~> 3.59.0"
+    }
+  }
+}