Add Support for List of Tag Maps

README.md

@@ -121,6 +121,93 @@ resource "aws_instance" "eg_prod_bastion_xyz" {
    vpc_security_group_ids = ["${aws_security_group.eg_prod_bastion_xyz.id}"]
 }
 ```
+### Advanced Example 2
+
+Here is a more complex example with an autoscaling group that has a different tagging schema than other resources and requres its tags to be in this format, which this module can generate:
+```hcl
+tags = [
+    {
+        key = Name,
+        propagate_at_launch = 1,
+        value = namespace-stage-jamie
+    },
+    {
+        key = Namespace,
+        propagate_at_launch = 1,
+        value = namespace
+    },
+    {
+        key = Stage,
+        propagate_at_launch = 1,
+        value = stage
+    }
+]
+```
+
+Autoscaling group using proagating tagging below (full example: examples/autoscalinggroup/main.tf)
+
+```hcl
+################################
+# terraform-null-label example #
+################################
+module "label" {
+  source    = "../../"
+  namespace = "awesomeproject"
+  stage     = "production"
+  name      = "clusterpluck"
+
+  tags = {
+    BusinessUnit = "Finance"
+    ManagedBy    = "Terraform"
+  }
+
+  additional_tag_map = {
+    propagate_at_launch = "true"
+  }
+}
+
+#######################
+# Launch template     #
+#######################
+resource "aws_launch_template" "this" {
+  # terraform-null-label example used here: Set template name prefix
+  name_prefix                           = "${module.label.id}-"
+  image_id                              = "${data.aws_ami.amazon_linux.id}"
+  instance_type                         = "t2.micro"
+  instance_initiated_shutdown_behavior  = "terminate"
+
+  vpc_security_group_ids                = ["${data.aws_security_group.default.id}"]
+
+  monitoring {
+    enabled                             = false
+  }
+  # terraform-null-label example used here: Set tags on volumes
+  tag_specifications {
+    resource_type                       = "volume"
+    tags                                = "${module.label.tags}"
+  }
+}
+
+######################
+# Autoscaling group  #
+######################
+resource "aws_autoscaling_group" "this" {
+  # terraform-null-label example used here: Set ASG name prefix
+  name_prefix                           = "${module.label.id}-"
+  vpc_zone_identifier                   = ["${data.aws_subnet_ids.all.ids}"]
+  max_size                              = "1"
+  min_size                              = "1"
+  desired_capacity                      = "1"
+
+  launch_template = {
+    id                                  = "${aws_launch_template.this.id}"
+    version                             = "$$Latest"
+  }
+
+  # terraform-null-label example used here: Set tags on ASG and EC2 Servers
+  tags                                  = ["${module.label.tags_as_list_of_maps}"]
+}
+```
 
 ## Input
 
@@ -134,6 +221,7 @@ resource "aws_instance" "eg_prod_bastion_xyz" {
 | namespace |__REQUIRED__ |Namespace, which could be your organization name, e.g. 'cp' or 'cloudposse'|
 | stage |__REQUIRED__ |Stage, e.g. 'prod', 'staging', 'dev', or 'test'|
 | tags |{} |Additional tags (e.g. `map('BusinessUnit`,`XYZ`)|
+| additional_tag_map | {} | additional tags that get appended to each map in the list of maps, for the output `tags_as_list_of_maps` |
 
 **WARNING** Any tags passed as an input to this module will *override* the tags generated by this module.
 
@@ -147,7 +235,8 @@ resource "aws_instance" "eg_prod_bastion_xyz" {
 | name | Normalized name  |
 | namespace | Normalized namespace  |
 | stage | Normalized stage  |
-| tags | Merge input tags with our tags. Note: `Name` has a special meaning in AWS and we need to disamgiuate it by using the computed `id`   |
+| tags | Merged input tags with our tags. Note: `Name` has a special meaning in AWS and we need to disamgiuate it by using the computed `id`   |
+| tags_as_list_of_maps | Merged input tags and our tags output as list of maps that contain the tags for use on certain resource types. |
 
 ## Help
 
@@ -213,8 +302,8 @@ or [hire us][hire] to help build your next cloud-platform.
 
 ### Contributors
 
-|[![Erik Osterman][erik_img]][erik_web]<br/>[Erik Osterman][erik_web] |[![Igor Rodionov][igor_img]][igor_web]<br/>[Igor Rodionov][igor_img] |[![Konstantin B][konstantin_img]][konstantin_web]<br/>[Konstantin B][konstantin_web] |[![Andriy Knysh][andriy_img]][andriy_web]<br/>[Andriy Knysh][andriy_web] |[![Sergey Vasilyev][sergey_img]][sergey_web]<br/>[Sergey Vasilyev][sergey_web] |
-|---|---|---|---|---|
+|[![Erik Osterman][erik_img]][erik_web]<br/>[Erik Osterman][erik_web] |[![Igor Rodionov][igor_img]][igor_web]<br/>[Igor Rodionov][igor_img] |[![Konstantin B][konstantin_img]][konstantin_web]<br/>[Konstantin B][konstantin_web] |[![Andriy Knysh][andriy_img]][andriy_web]<br/>[Andriy Knysh][andriy_web] |[![Sergey Vasilyev][sergey_img]][sergey_web]<br/>[Sergey Vasilyev][sergey_web] | [![Jamie Nelson][bitflight_img]][bitflight_web]<br/>[Jamie Nelson][bitflight_web] |
+|---|---|---|---|---|---|
 
 [andriy_img]: https://avatars0.githubusercontent.com/u/7356997?v=4&u=ed9ce1c9151d552d985bdf5546772e14ef7ab617&s=144
 [andriy_web]: https://github.com/aknysh/
@@ -236,3 +325,6 @@ or [hire us][hire] to help build your next cloud-platform.
 
 [vladimir_img]: https://avatars1.githubusercontent.com/u/26582191?v=4&u=ed9ce1c9151d552d985bdf5546772e14ef7ab617&s=144
 [vladimir_web]: https://github.com/SweetOps/
+
+[bitflight_img]: https://avatars0.githubusercontent.com/u/25075504?s=144&u=ac7e53bda3706cb9d51907808574b6d342703b3e&v=4
+[bitflight_web]: https://github.com/Jamie-BitFlight

examples/autoscalinggroup/main.tf

@@ -0,0 +1,122 @@
+################################
+# terraform-null-label example #
+################################
+module "label" {
+  source    = "../../"
+  namespace = "awesomeproject"
+  stage     = "production"
+  name      = "clusterpluck"
+
+  tags = {
+    BusinessUnit = "Finance"
+    ManagedBy    = "Terraform"
+  }
+
+  additional_tag_map = {
+    propagate_at_launch = "true"
+  }
+}
+
+#######################
+# Launch template     #
+#######################
+resource "aws_launch_template" "default" {
+  # terraform-null-label example used here: Set template name prefix
+  name_prefix                          = "${module.label.id}-"
+  image_id                             = "${data.aws_ami.amazon_linux.id}"
+  instance_type                        = "t2.micro"
+  instance_initiated_shutdown_behavior = "terminate"
+
+  vpc_security_group_ids = ["${data.aws_security_group.default.id}"]
+
+  monitoring {
+    enabled = false
+  }
+
+  # terraform-null-label example used here: Set tags on volumes
+  tag_specifications {
+    resource_type = "volume"
+    tags          = "${module.label.tags}"
+  }
+}
+
+######################
+# Autoscaling group  #
+######################
+resource "aws_autoscaling_group" "default" {
+  # terraform-null-label example used here: Set ASG name prefix
+  name_prefix         = "${module.label.id}-"
+  vpc_zone_identifier = ["${data.aws_subnet_ids.all.ids}"]
+  max_size            = "1"
+  min_size            = "1"
+  desired_capacity    = "1"
+
+  launch_template = {
+    id      = "${aws_launch_template.default.id}"
+    version = "$$Latest"
+  }
+
+  # terraform-null-label example used here: Set tags on ASG and EC2 Servers
+  tags = ["${module.label.tags_as_list_of_maps}"]
+}
+
+# terraform-null-label example used here: Output list of tags applied in each format
+output "tags_as_list_of_maps" {
+  value = ["${module.label.tags_as_list_of_maps}"]
+}
+
+output "tags" {
+  value = ["${module.label.tags}"]
+}
+
+################################
+# Provider                     #
+################################
+
+provider "aws" {
+  region  = "eu-west-1"
+  version = "~> 1.17"
+
+  # Make it faster by skipping unneeded checks here
+  skip_get_ec2_platforms      = true
+  skip_metadata_api_check     = true
+  skip_region_validation      = true
+  skip_credentials_validation = true
+  skip_requesting_account_id  = true
+}
+
+##############################################################
+# Data sources to get VPC, subnets and security group details
+##############################################################
+data "aws_vpc" "default" {
+  default = true
+}
+
+data "aws_subnet_ids" "all" {
+  vpc_id = "${data.aws_vpc.default.id}"
+}
+
+data "aws_security_group" "default" {
+  vpc_id = "${data.aws_vpc.default.id}"
+  name   = "default"
+}
+
+data "aws_ami" "amazon_linux" {
+  most_recent = true
+
+  filter {
+    name = "name"
+
+    values = [
+      "amzn-ami-hvm-*-x86_64-gp2",
+    ]
+  }
+
+  filter {
+    name = "owner-alias"
+
+    values = [
+      "amazon",
+    ]
+  }
+}

main.tf

@@ -1,15 +1,30 @@
-resource "null_resource" "default" {
-  count = "${var.enabled == "true" ? 1 : 0}"
-
-  triggers = {
-    id         = "${lower(join(var.delimiter, compact(concat(list(var.namespace, var.stage, var.name), var.attributes))))}"
-    name       = "${lower(format("%v", var.name))}"
-    namespace  = "${lower(format("%v", var.namespace))}"
-    stage      = "${lower(format("%v", var.stage))}"
-    attributes = "${lower(format("%v", join(var.delimiter, compact(var.attributes))))}"
-  }
-
-  lifecycle {
-    create_before_destroy = true
-  }
+locals {
+  enabled    = "${var.enabled == "true" ? true : false }"
+  id         = "${local.enabled ? lower(join(var.delimiter, compact(concat(list(var.namespace, var.stage, var.name), var.attributes)))) : ""}"
+  name       = "${local.enabled ? lower(format("%v", var.name)) : ""}"
+  namespace  = "${local.enabled ? lower(format("%v", var.namespace)) : ""}"
+  stage      = "${local.enabled ? lower(format("%v", var.stage)) : ""}"
+  attributes = "${local.enabled ? lower(format("%v", join(var.delimiter, compact(var.attributes)))) : ""}"
+
+  tags = "${
+      merge( 
+        map(
+          "Name", "${local.id}",
+          "Namespace", "${local.namespace}",
+          "Stage", "${local.stage}"
+        ), var.tags
+      )
+    }"
+
+  tags_as_list_of_maps = ["${null_resource.tags_as_list_of_maps.*.triggers}"]
+}
+
+resource "null_resource" "tags_as_list_of_maps" {
+  count = "${length(keys(local.tags))}"
+
+  triggers = "${merge(map(
+    "key", "${element(keys(local.tags), count.index)}",
+    "value", "${element(values(local.tags), count.index)}"
+  ),
+  var.additional_tag_map)}"
 }

outputs.tf

@@ -1,40 +1,37 @@
 output "id" {
-  value       = "${join("", null_resource.default.*.triggers.id)}"
+  value       = "${local.id}"
   description = "Disambiguated ID"
 }
 
 output "name" {
-  value       = "${join("", null_resource.default.*.triggers.name)}"
+  value       = "${local.name}"
   description = "Normalized name"
 }
 
 output "namespace" {
-  value       = "${join("", null_resource.default.*.triggers.namespace)}"
+  value       = "${local.namespace}"
   description = "Normalized namespace"
 }
 
 output "stage" {
-  value       = "${join("", null_resource.default.*.triggers.stage)}"
+  value       = "${local.stage}"
   description = "Normalized stage"
 }
 
 output "attributes" {
-  value       = "${join("", null_resource.default.*.triggers.attributes)}"
+  value       = "${local.attributes}"
   description = "Normalized attributes"
 }
 
 # Merge input tags with our tags.
 # Note: `Name` has a special meaning in AWS and we need to disamgiuate it by using the computed `id`
 output "tags" {
-  value = "${
-      merge( 
-        map(
-          "Name", "${join("", null_resource.default.*.triggers.id)}",
-          "Namespace", "${join("", null_resource.default.*.triggers.namespace)}",
-          "Stage", "${join("", null_resource.default.*.triggers.stage)}"
-        ), var.tags
-      )
-    }"
+  value = "${local.tags}"
 
   description = "Normalized Tag map"
 }
+
+output "tags_as_list_of_maps" {
+  value       = ["${local.tags_as_list_of_maps}"]
+  description = "Additional tags as a list of maps. Which can be used in several resources."
+}

variables.tf

@@ -32,3 +32,9 @@ variable "tags" {
   default     = {}
   description = "Additional tags (e.g. `map('BusinessUnit`,`XYZ`)"
 }
+
+variable "additional_tag_map" {
+  type        = "map"
+  default     = {}
+  description = "Additional tags for appending to each tag map."
+}