Merge pull request #4 from dreamteam-gg/PEERING

Added support to add route with already created peering connection

README.md

@@ -32,6 +32,24 @@ module "vpc-peering" {
   auto_accept_peering     = true
 }
 ```
+
+Usage with already created peering connection:
+```hc1 
+module "vpc-peering" {
+  source = "./terraform-aws-vpc-peering"
+
+  owner_account_id        = "000000000000"
+  vpc_peer_id             = "vpc-00000000"
+  this_vpc_id             = "${module.vpc.vpc_id}"
+  private_route_table_ids = ["${module.vpc.private_route_table_ids}"]
+  public_route_table_ids  = ["${module.vpc.public_route_table_ids}"]
+  peer_cidr_block         = "10.1.0.1/24"
+  auto_accept_peering     = true
+  create_peering          = 0
+  peering_id              = "pcx-00000000"
+
+}
+```
 Examples
 --------
 Complete example is shown above

main.tf

@@ -2,6 +2,7 @@
 # VPC peering connection #
 ##########################
 resource "aws_vpc_peering_connection" "this" {
+  count = "${var.create_peering ? 1 : 0}"
   peer_owner_id = "${var.owner_account_id}"
   peer_vpc_id   = "${var.vpc_peer_id}"
   vpc_id        = "${var.this_vpc_id}"
@@ -13,21 +14,17 @@ resource "aws_vpc_peering_connection" "this" {
 ##################
 resource "aws_route" "private_route_table" {
   count = "${length(var.private_route_table_ids)}"
-
   route_table_id            = "${element(var.private_route_table_ids, count.index)}"
   destination_cidr_block    = "${var.peer_cidr_block}"
-  vpc_peering_connection_id = "${aws_vpc_peering_connection.this.id}"
-  depends_on                = ["aws_vpc_peering_connection.this"]
+  vpc_peering_connection_id = "${var.peering_id == "" ? element(concat(aws_vpc_peering_connection.this.*.id, list("")), 0) : var.peering_id}"
 }
 
 #################
 # Public routes #
 #################
 resource "aws_route" "public_route_table" {
-  count = "${length(var.public_route_table_ids) > 0 ? 1: 0}"
-
+  count = "${length(var.public_route_table_ids)}"
   route_table_id            = "${element(var.public_route_table_ids, count.index)}"
   destination_cidr_block    = "${var.peer_cidr_block}"
-  vpc_peering_connection_id = "${aws_vpc_peering_connection.this.id}"
-  depends_on                = ["aws_vpc_peering_connection.this"]
+  vpc_peering_connection_id = "${var.peering_id == "" ? element(concat(aws_vpc_peering_connection.this.*.id, list("")), 0) : var.peering_id}"
 }

outputs.tf

@@ -1,6 +1,6 @@
 output "vpc_peering_id" {
   description = "Peering connection ID"
-  value       = "${aws_vpc_peering_connection.this.id}"
+  value       = "${var.peering_id == "" ? element(concat(aws_vpc_peering_connection.this.*.id, list("")), 0) : var.peering_id}"
 }
 
 output "private_route_tables" {

variables.tf

@@ -34,3 +34,13 @@ variable "auto_accept_peering" {
   description = "Auto accept peering connection"
   default     = false
 }
+
+variable "create_peering" {
+  description = "Create peering connection, 0 to not create"
+  default = 1
+}
+
+variable "peering_id" {
+   description = "Provide already existing peering connection id"
+   default = ""
+}