Tags the same if overlapping resources (#38)

main.tf

@@ -7,6 +7,11 @@ provider "aws" {
  alias = "peer"
 }
 
+locals {
+ peer_region = "${var.peer_region == "" ? data.aws_region.peer.name : var.peer_region}"
+ same_acount_and_region = "${data.aws_region.this.name == local.peer_region && data.aws_caller_identity.this.account_id == data.aws_caller_identity.peer.account_id}"
+}
+
 ##########################
 # VPC peering connection #
 ##########################
@@ -15,8 +20,8 @@ resource "aws_vpc_peering_connection" "this" {
  peer_owner_id = "${data.aws_caller_identity.peer.account_id}"
  peer_vpc_id = "${var.peer_vpc_id}"
  vpc_id = "${var.this_vpc_id}"
- peer_region = "${var.peer_region == "" ? data.aws_region.this.name : var.peer_region}"
- tags = "${var.tags}"
+ peer_region = "${local.peer_region}"
+ tags = "${merge(var.tags, map("Side", local.same_acount_and_region ? "Both" : "Requester"))}"
 }
 
 ######################################
@@ -26,7 +31,7 @@ resource "aws_vpc_peering_connection_accepter" "peer_accepter" {
  provider = "aws.peer"
  vpc_peering_connection_id = "${aws_vpc_peering_connection.this.id}"
  auto_accept = "${var.auto_accept_peering}"
- tags = "${merge(var.tags, map("Side", "Accepter"))}"
+ tags = "${merge(var.tags, map("Side", local.same_acount_and_region ? "Both" : "Accepter"))}"
 }
 
 #######################