Added tags to find vpc (#10)

* Added tags to find vpc * Added tags to find vpc * Apply suggestions from code review Co-Authored-By: goruha <goruha@gmail.com> * Address comments * Address comments * Address comments
cloudposse · Apr 12, 2019 · b76e9be · b76e9be
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diff --git a/README.md b/README.md
@@ -48,6 +48,13 @@ We literally have [*hundreds of terraform modules*][terraform_modules] that are
 
 ## Usage
 
+**IMPORTANT:** Using the `master` branch is just an example.
+Do not pin to `master` in your code because there may be breaking changes between releases.
+Instead pin to the release tag (e.g. `?ref=tags/x.y.z`) of one of our [latest releases](https://github.com/cloudposse/terraform-aws-vpc-peering/releases).
+
+
+### Using VPC IDs
+
 ```hcl
 module "vpc_peering" {
   source           = "git::https://github.com/cloudposse/terraform-aws-vpc-peering.git?ref=master"
@@ -59,6 +66,23 @@ module "vpc_peering" {
 }
 ```
 
+### Using VPC tags
+
+```hcl
+module "vpc_peering" {
+  source             = "git::https://github.com/cloudposse/terraform-aws-vpc-peering.git?ref=master"
+  namespace          = "cp"
+  stage              = "dev"
+  name               = "cluster"
+  requestor_vpc_tags = {
+    "kubernetes.io/cluster/my-k8s" = "owned"
+  }
+  acceptor_vpc_tags  = {
+    Name = "legacy-vpc"
+  }
+}
+```
+
 
 
 
@@ -74,21 +98,22 @@ Available targets:
   lint                                Lint terraform code
 
 ```
-
 ## Inputs
 
 | Name | Description | Type | Default | Required |
 |------|-------------|:----:|:-----:|:-----:|
 | acceptor_allow_remote_vpc_dns_resolution | Allow acceptor VPC to resolve public DNS hostnames to private IP addresses when queried from instances in the requestor VPC | string | `true` | no |
-| acceptor_vpc_id | Acceptor VPC ID | string | - | yes |
+| acceptor_vpc_id | Acceptor VPC ID | string | `` | no |
+| acceptor_vpc_tags | Acceptor VPC tags | map | `<map>` | no |
 | attributes | Additional attributes (e.g. `policy` or `role`) | list | `<list>` | no |
 | auto_accept | Automatically accept the peering (both VPCs need to be in the same AWS account) | string | `true` | no |
 | delimiter | Delimiter to be used between `namespace`, `stage`, `name`, and `attributes` | string | `-` | no |
 | enabled | Set to false to prevent the module from creating or accessing any resources | string | `true` | no |
 | name | Name  (e.g. `app` or `cluster`) | string | - | yes |
 | namespace | Namespace (e.g. `cp` or `cloudposse`) | string | - | yes |
 | requestor_allow_remote_vpc_dns_resolution | Allow requestor VPC to resolve public DNS hostnames to private IP addresses when queried from instances in the acceptor VPC | string | `true` | no |
-| requestor_vpc_id | Requestor VPC ID | string | - | yes |
+| requestor_vpc_id | Requestor VPC ID | string | `` | no |
+| requestor_vpc_tags | Requestor VPC tags | map | `<map>` | no |
 | stage | Stage (e.g. `prod`, `dev`, `staging`) | string | - | yes |
 | tags | Additional tags (e.g. map('BusinessUnit`,`XYZ`) | map | `<map>` | no |
 
@@ -188,7 +213,7 @@ In general, PRs are welcome. We follow the typical "fork-and-pull" Git workflow.
 
 ## Copyright
 
-Copyright © 2017-2018 [Cloud Posse, LLC](https://cpco.io/copyright)
+Copyright © 2017-2019 [Cloud Posse, LLC](https://cpco.io/copyright)
 
 
 

diff --git a/README.yaml b/README.yaml
@@ -58,6 +58,13 @@ description: |-
 
 # How to use this project
 usage: |-
+  **IMPORTANT:** Using the `master` branch is just an example.
+  Do not pin to `master` in your code because there may be breaking changes between releases.
+  Instead pin to the release tag (e.g. `?ref=tags/x.y.z`) of one of our [latest releases](https://github.com/cloudposse/terraform-aws-vpc-peering/releases).
+
+
+  ### Using VPC IDs
+
   ```hcl
   module "vpc_peering" {
     source           = "git::https://github.com/cloudposse/terraform-aws-vpc-peering.git?ref=master"
@@ -69,6 +76,24 @@ usage: |-
   }
   ```
 
+  ### Using VPC tags
+
+  ```hcl
+  module "vpc_peering" {
+    source             = "git::https://github.com/cloudposse/terraform-aws-vpc-peering.git?ref=master"
+    namespace          = "cp"
+    stage              = "dev"
+    name               = "cluster"
+    requestor_vpc_tags = {
+      "kubernetes.io/cluster/my-k8s" = "owned"
+    }
+    acceptor_vpc_tags  = {
+      Name = "legacy-vpc"
+    }
+  }
+  ```
+
+
 references:
   - name: "terraform-aws-vpc-kops-peering"
     description: "Thanks to [Gladly.com](https://www.gladly.com/) for the inspiration with this wonderful module"
@@ -88,4 +113,4 @@ contributors:
   - name: "Andriy Knysh"
     github: "aknysh"
   - name: "Vladimir"
-    github: "SweetOps"
+    github: "SweetOps"
diff --git a/docs/terraform.md b/docs/terraform.md
@@ -1,18 +1,19 @@
-
 ## Inputs
 
 | Name | Description | Type | Default | Required |
 |------|-------------|:----:|:-----:|:-----:|
 | acceptor_allow_remote_vpc_dns_resolution | Allow acceptor VPC to resolve public DNS hostnames to private IP addresses when queried from instances in the requestor VPC | string | `true` | no |
-| acceptor_vpc_id | Acceptor VPC ID | string | - | yes |
+| acceptor_vpc_id | Acceptor VPC ID | string | `` | no |
+| acceptor_vpc_tags | Acceptor VPC tags | map | `<map>` | no |
 | attributes | Additional attributes (e.g. `policy` or `role`) | list | `<list>` | no |
 | auto_accept | Automatically accept the peering (both VPCs need to be in the same AWS account) | string | `true` | no |
 | delimiter | Delimiter to be used between `namespace`, `stage`, `name`, and `attributes` | string | `-` | no |
 | enabled | Set to false to prevent the module from creating or accessing any resources | string | `true` | no |
 | name | Name  (e.g. `app` or `cluster`) | string | - | yes |
 | namespace | Namespace (e.g. `cp` or `cloudposse`) | string | - | yes |
 | requestor_allow_remote_vpc_dns_resolution | Allow requestor VPC to resolve public DNS hostnames to private IP addresses when queried from instances in the acceptor VPC | string | `true` | no |
-| requestor_vpc_id | Requestor VPC ID | string | - | yes |
+| requestor_vpc_id | Requestor VPC ID | string | `` | no |
+| requestor_vpc_tags | Requestor VPC tags | map | `<map>` | no |
 | stage | Stage (e.g. `prod`, `dev`, `staging`) | string | - | yes |
 | tags | Additional tags (e.g. map('BusinessUnit`,`XYZ`) | map | `<map>` | no |
 

diff --git a/main.tf b/main.tf
@@ -11,8 +11,8 @@ module "label" {
 
 resource "aws_vpc_peering_connection" "default" {
   count       = "${var.enabled == "true" ? 1 : 0}"
-  vpc_id      = "${var.requestor_vpc_id}"
-  peer_vpc_id = "${var.acceptor_vpc_id}"
+  vpc_id      = "${join("", data.aws_vpc.requestor.*.id)}"
+  peer_vpc_id = "${join("", data.aws_vpc.acceptor.*.id)}"
 
   auto_accept = "${var.auto_accept}"
 
@@ -31,6 +31,7 @@ resource "aws_vpc_peering_connection" "default" {
 data "aws_vpc" "requestor" {
   count = "${var.enabled == "true" ? 1 : 0}"
   id    = "${var.requestor_vpc_id}"
+  tags  = "${var.requestor_vpc_tags}"
 }
 
 # Lookup requestor route tables
@@ -49,6 +50,7 @@ data "aws_subnet_ids" "requestor" {
 data "aws_vpc" "acceptor" {
   count = "${var.enabled == "true" ? 1 : 0}"
   id    = "${var.acceptor_vpc_id}"
+  tags  = "${var.acceptor_vpc_tags}"
 }
 
 # Lookup acceptor subnets

diff --git a/variables.tf b/variables.tf
@@ -6,11 +6,25 @@ variable "enabled" {
 variable "requestor_vpc_id" {
   type        = "string"
   description = "Requestor VPC ID"
+  default     = ""
+}
+
+variable "requestor_vpc_tags" {
+  type        = "map"
+  description = "Requestor VPC tags"
+  default     = {}
 }
 
 variable "acceptor_vpc_id" {
   type        = "string"
   description = "Acceptor VPC ID"
+  default     = ""
+}
+
+variable "acceptor_vpc_tags" {
+  type        = "map"
+  description = "Acceptor VPC tags"
+  default     = {}
 }
 
 variable "auto_accept" {