Replace extraneous label with module dependency.

CHANGELOG.md

@@ -7,6 +7,14 @@ project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+### Removed
+
+- Removed variable `peering_completed`. [#78]
+
+### Added
+
+- Added variable `module_depends_on`. [#78]
+
 ## [2.0.0] - 2019-09-26
 
 2.0.0 is a backward incompatible release. Review the
@@ -52,3 +60,4 @@ project adheres to [Semantic Versioning](http://semver.org/).
 [#56]: https://github.com/terraform-google-modules/terraform-google-sql-db/pull/56
 [#53]: https://github.com/terraform-google-modules/terraform-google-sql-db/pull/53
 [#43]: https://github.com/terraform-google-modules/terraform-google-sql-db/pull/43
+[#78]: https://github.com/terraform-google-modules/terraform-google-sql-db/pull/78

examples/mysql-and-postgres-private/main.tf

@@ -130,7 +130,7 @@ module "safer-mysql-db" {
   vpc_network      = google_compute_network.default.self_link
 
   // Used to enforce ordering in the creation of resources.
-  peering_completed = module.private-service-access.peering_completed
+  module_depends_on = [module.private-service-access.peering_completed]
 }
 
 

modules/mysql/README.md

@@ -42,6 +42,7 @@
 | maintenance\_window\_day | The day of week (1-7) for the master instance maintenance. | number | `"1"` | no |
 | maintenance\_window\_hour | The hour of day (0-23) maintenance window for the master instance maintenance. | number | `"23"` | no |
 | maintenance\_window\_update\_track | The update track of maintenance window for the master instance maintenance. Can be either `canary` or `stable`. | string | `"canary"` | no |
+| module\_depends\_on | List of modules or resources this module depends on. | list(any) | `<list>` | no |
 | name | The name of the Cloud SQL resources | string | n/a | yes |
 | pricing\_plan | The pricing plan for the master instance. | string | `"PER_USE"` | no |
 | project\_id | The project ID to manage the Cloud SQL resources | string | n/a | yes |

modules/mysql/main.tf

@@ -96,6 +96,8 @@ resource "google_sql_database_instance" "default" {
     update = var.update_timeout
     delete = var.delete_timeout
   }
+
+  depends_on = [null_resource.module_depends_on]
 }
 
 resource "google_sql_database" "default" {
@@ -104,7 +106,7 @@ resource "google_sql_database" "default" {
   instance   = google_sql_database_instance.default.name
   charset    = var.db_charset
   collation  = var.db_collation
-  depends_on = [google_sql_database_instance.default]
+  depends_on = [null_resource.module_depends_on, google_sql_database_instance.default]
 }
 
 resource "google_sql_database" "additional_databases" {
@@ -114,7 +116,7 @@ resource "google_sql_database" "additional_databases" {
   charset    = lookup(var.additional_databases[count.index], "charset", null)
   collation  = lookup(var.additional_databases[count.index], "collation", null)
   instance   = google_sql_database_instance.default.name
-  depends_on = [google_sql_database_instance.default]
+  depends_on = [null_resource.module_depends_on, google_sql_database_instance.default]
 }
 
 resource "random_id" "user-password" {
@@ -123,7 +125,7 @@ resource "random_id" "user-password" {
   }
 
   byte_length = 8
-  depends_on  = [google_sql_database_instance.default]
+  depends_on  = [null_resource.module_depends_on, google_sql_database_instance.default]
 }
 
 resource "google_sql_user" "default" {
@@ -132,7 +134,7 @@ resource "google_sql_user" "default" {
   instance   = google_sql_database_instance.default.name
   host       = var.user_host
   password   = var.user_password == "" ? random_id.user-password.hex : var.user_password
-  depends_on = [google_sql_database_instance.default]
+  depends_on = [null_resource.module_depends_on, google_sql_database_instance.default]
 }
 
 resource "google_sql_user" "additional_users" {
@@ -146,6 +148,11 @@ resource "google_sql_user" "additional_users" {
   )
   host       = lookup(var.additional_users[count.index], "host", var.user_host)
   instance   = google_sql_database_instance.default.name
-  depends_on = [google_sql_database_instance.default]
+  depends_on = [null_resource.module_depends_on, google_sql_database_instance.default]
 }
 
+resource "null_resource" "module_depends_on" {
+  triggers = {
+    value = length(var.module_depends_on)
+  }
+}

modules/mysql/variables.tf

@@ -522,3 +522,8 @@ variable "delete_timeout" {
   default     = "10m"
 }
 
+variable "module_depends_on" {
+  description = "List of modules or resources this module depends on."
+  type        = list(any)
+  default     = []
+}

modules/postgresql/README.md

@@ -25,8 +25,8 @@
 | maintenance\_window\_day | The day of week (1-7) for the master instance maintenance. | number | `"1"` | no |
 | maintenance\_window\_hour | The hour of day (0-23) maintenance window for the master instance maintenance. | number | `"23"` | no |
 | maintenance\_window\_update\_track | The update track of maintenance window for the master instance maintenance.Can be either `canary` or `stable`. | string | `"canary"` | no |
+| module\_depends\_on | List of modules or resources this module depends on. | list(any) | `<list>` | no |
 | name | The name of the Cloud SQL resources | string | n/a | yes |
-| peering\_completed | Optional. This is used to ensure that resources are created in the proper order when using private IPs and service network peering. | string | `""` | no |
 | pricing\_plan | The pricing plan for the master instance. | string | `"PER_USE"` | no |
 | project\_id | The project ID to manage the Cloud SQL resources | string | n/a | yes |
 | read\_replica\_activation\_policy | The activation policy for the read replica instances.Can be either `ALWAYS`, `NEVER` or `ON_DEMAND`. | string | `"ALWAYS"` | no |

modules/postgresql/main.tf

@@ -21,13 +21,6 @@ locals {
     enabled  = var.ip_configuration
     disabled = {}
   }
-
-  peering_completed_enabled = var.peering_completed != "" ? true : false
-
-  user_labels_including_tf_dependency = {
-    enabled  = merge(map("tf_dependency", var.peering_completed), var.user_labels)
-    disabled = var.user_labels
-  }
 }
 
 resource "google_sql_database_instance" "default" {
@@ -79,10 +72,7 @@ resource "google_sql_database_instance" "default" {
       }
     }
 
-    // Define a label to force a dependency to the creation of the network peering.
-    // Substitute this with a module dependency once the module is migrated to
-    // Terraform 0.12
-    user_labels = local.user_labels_including_tf_dependency["${local.peering_completed_enabled ? "enabled" : "disabled"}"]
+    user_labels = var.user_labels
 
     location_preference {
       zone = "${var.region}-${var.zone}"
@@ -106,6 +96,8 @@ resource "google_sql_database_instance" "default" {
     update = var.update_timeout
     delete = var.delete_timeout
   }
+
+  depends_on = [null_resource.module_depends_on]
 }
 
 resource "google_sql_database" "default" {
@@ -114,7 +106,7 @@ resource "google_sql_database" "default" {
   instance   = google_sql_database_instance.default.name
   charset    = var.db_charset
   collation  = var.db_collation
-  depends_on = [google_sql_database_instance.default]
+  depends_on = [null_resource.module_depends_on, google_sql_database_instance.default]
 }
 
 resource "google_sql_database" "additional_databases" {
@@ -124,7 +116,7 @@ resource "google_sql_database" "additional_databases" {
   charset    = lookup(var.additional_databases[count.index], "charset", "")
   collation  = lookup(var.additional_databases[count.index], "collation", "")
   instance   = google_sql_database_instance.default.name
-  depends_on = [google_sql_database_instance.default]
+  depends_on = [null_resource.module_depends_on, google_sql_database_instance.default]
 }
 
 resource "random_id" "user-password" {
@@ -133,15 +125,15 @@ resource "random_id" "user-password" {
   }
 
   byte_length = 8
-  depends_on  = [google_sql_database_instance.default]
+  depends_on  = [null_resource.module_depends_on, google_sql_database_instance.default]
 }
 
 resource "google_sql_user" "default" {
   name       = var.user_name
   project    = var.project_id
   instance   = google_sql_database_instance.default.name
   password   = var.user_password == "" ? random_id.user-password.hex : var.user_password
-  depends_on = [google_sql_database_instance.default]
+  depends_on = [null_resource.module_depends_on, google_sql_database_instance.default]
 }
 
 resource "google_sql_user" "additional_users" {
@@ -154,5 +146,11 @@ resource "google_sql_user" "additional_users" {
     random_id.user-password.hex,
   )
   instance   = google_sql_database_instance.default.name
-  depends_on = [google_sql_database_instance.default]
+  depends_on = [null_resource.module_depends_on, google_sql_database_instance.default]
+}
+
+resource "null_resource" "module_depends_on" {
+  triggers = {
+    value = length(var.module_depends_on)
+  }
 }

modules/postgresql/variables.tf

@@ -48,12 +48,6 @@ variable "zone" {
   description = "The zone for the master instance, it should be something like: `a`, `c`."
 }
 
-variable "peering_completed" {
-  description = "Optional. This is used to ensure that resources are created in the proper order when using private IPs and service network peering."
-  type        = string
-  default     = ""
-}
-
 variable "activation_policy" {
   description = "The activation policy for the master instance.Can be either `ALWAYS`, `NEVER` or `ON_DEMAND`."
   type        = string
@@ -363,3 +357,9 @@ variable "delete_timeout" {
   type        = string
   default     = "10m"
 }
+
+variable "module_depends_on" {
+  description = "List of modules or resources this module depends on."
+  type        = list(any)
+  default     = []
+}

modules/safer_mysql/README.md

@@ -200,8 +200,8 @@ mysql -S $HOME/mysql_sockets/myproject:region:instance -u user -p
 | maintenance\_window\_day | The day of week (1-7) for the master instance maintenance. | number | `"1"` | no |
 | maintenance\_window\_hour | The hour of day (0-23) maintenance window for the master instance maintenance. | number | `"23"` | no |
 | maintenance\_window\_update\_track | The update track of maintenance window for the master instance maintenance. Can be either `canary` or `stable`. | string | `"stable"` | no |
+| module\_depends\_on | List of modules or resources this module depends on. | list(any) | `<list>` | no |
 | name | The name of the Cloud SQL resources | string | n/a | yes |
-| peering\_completed | Optional. This is used to ensure that resources are created in the proper order when using private IPs and service network peering. | string | `""` | no |
 | pricing\_plan | The pricing plan for the master instance. | string | `"PER_USE"` | no |
 | project\_id | The project ID to manage the Cloud SQL resources | string | n/a | yes |
 | read\_replica\_activation\_policy | The activation policy for the read replica instances. Can be either `ALWAYS`, `NEVER` or `ON_DEMAND`. | string | `"ALWAYS"` | no |

modules/safer_mysql/main.tf

@@ -33,15 +33,7 @@ module "safer_mysql" {
   maintenance_window_update_track = var.maintenance_window_update_track
   database_flags                  = var.database_flags
 
-  // Define a label to force a dependency to the creation of the network peering.
-  // Substitute this with a module dependency once the module is migrated to
-  // Terraform 0.12
-  user_labels = merge(
-    {
-      "tf_dependency" = var.peering_completed
-    },
-    var.user_labels,
-  )
+  user_labels = var.user_labels
 
   backup_configuration = var.backup_configuration
 
@@ -119,7 +111,8 @@ module "safer_mysql" {
     private_network     = var.vpc_network
     require_ssl         = true
   }
-  create_timeout = var.create_timeout
-  update_timeout = var.update_timeout
-  delete_timeout = var.delete_timeout
+  create_timeout    = var.create_timeout
+  update_timeout    = var.update_timeout
+  delete_timeout    = var.delete_timeout
+  module_depends_on = var.module_depends_on
 }

modules/safer_mysql/variables.tf

@@ -42,12 +42,6 @@ variable "vpc_network" {
   type        = string
 }
 
-variable "peering_completed" {
-  description = "Optional. This is used to ensure that resources are created in the proper order when using private IPs and service network peering."
-  type        = string
-  default     = ""
-}
-
 // Master
 variable "tier" {
   description = "The tier for the master instance."
@@ -482,3 +476,9 @@ variable "delete_timeout" {
   type        = string
   default     = "15m"
 }
+
+variable "module_depends_on" {
+  description = "List of modules or resources this module depends on."
+  type        = list(any)
+  default     = []
+}

test/fixtures/safer-mysql-simple/main.tf

@@ -82,5 +82,5 @@ module "safer-mysql-db" {
   vpc_network      = module.network-safer-mysql-simple.network_self_link
 
   // Optional: used to enforce ordering in the creation of resources.
-  peering_completed = module.private-service-access.peering_completed
+  module_depends_on = [module.private-service-access.peering_completed]
 }