From 35edf309303847a61d654fd13b9e04bc8a224f1e Mon Sep 17 00:00:00 2001
From: Quentin Manfroi <quentin.manfroi@fr.clara.net>
Date: Fri, 10 Aug 2018 16:57:09 +0200
Subject: [PATCH] MON-273 add filter tags module

---
 common/alerting-message/README.md | 19 +++++--------
 common/filter-tags/README.md      | 45 +++++++++++++++++++++++++++++++
 common/filter-tags/inputs.tf      | 20 ++++++++++++++
 common/filter-tags/locals.tf      |  4 +++
 common/filter-tags/output.tf      | 10 +++++++
 5 files changed, 85 insertions(+), 13 deletions(-)
 create mode 100644 common/filter-tags/README.md
 create mode 100644 common/filter-tags/inputs.tf
 create mode 100644 common/filter-tags/locals.tf
 create mode 100644 common/filter-tags/output.tf

diff --git a/common/alerting-message/README.md b/common/alerting-message/README.md
index 2a5d870..49ac413 100644
--- a/common/alerting-message/README.md
+++ b/common/alerting-message/README.md
@@ -1,8 +1,6 @@
-Alerting Message Datadog Generator
-==================================
+# ALERTING MESSAGE Datadog Generator
 
-How to use this module
-----------------------
+## How to use this module
 
 ```
 module "datadog-message-alerting" {
@@ -14,8 +12,7 @@ module "datadog-message-alerting" {
 }
 ```
 
-Purpose
--------
+## Purpose
 
 Creates a DataDog monitor alert message with the following inputs :
 
@@ -25,8 +22,7 @@ Creates a DataDog monitor alert message with the following inputs :
 * Prepend text free string
 * Append text free string
 
-Inputs
-------
+## Inputs
 
 | Name | Description | Type | Default | Required |
 |------|-------------|:----:|:-----:|:-----:|
@@ -36,14 +32,11 @@ Inputs
 | message_warning | Define a broadcast channel for warning alerts | string | - | yes |
 | prepend_text | Optional free text string to prepend to alert | string | `` | no |
 
-Outputs
--------
+## Outputs
 
 | Name | Description |
 |------|-------------|
 | alerting-message | The generated message string |
 
-Related documentation
----------------------
+## Related documentation
 
-DataDog documentation: [https://docs.datadoghq.com/integrations/azure_app_services](https://docs.datadoghq.com/integrations/azure_app_services)
diff --git a/common/filter-tags/README.md b/common/filter-tags/README.md
new file mode 100644
index 0000000..80ce730
--- /dev/null
+++ b/common/filter-tags/README.md
@@ -0,0 +1,45 @@
+# FILTER TAGS Datadog Generator
+
+## How to use this module
+
+This module usage should be transparent because it should be used inside each monitors set directly.
+Here is a simple example but it is advisable to see how are created other existing monitors sets:
+
+```
+module "filter-tags" {
+  source = "../../common/filter-tags"
+
+  environment              = "${var.environment}"
+  resource                 = "my_resource"
+  filter_tags_use_defaults = "${var.filter_tags_use_defaults}"
+  filter_tags_custom       = "${var.filter_tags_custom}"
+}
+```
+
+## Purpose
+
+Creates all kinds of filters tags patterns depending of the monitor type and directly usable in a monitors set :
+
+* A filter tags pattern for service check
+* A filter tags pattern for query alert
+
+## Inputs
+
+| Name | Description | Type | Default | Required |
+|------|-------------|:----:|:-----:|:-----:|
+| environment | Architecture Environment | string | - | yes |
+| filter_tags_custom | Tags used for custom filtering when filter_tags_use_defaults is false | string | `*` | no |
+| filter_tags_use_defaults | Use default filter tags convention | string | `true` | no |
+| resource | The dedicated tag for the resource | string | - | yes |
+
+## Outputs
+
+| Name | Description |
+|------|-------------|
+| query_alert | The full filtering pattern including parentheses for service check monitor type |
+| service_check | The full filtering pattern including braces for query alert monitor type |
+
+## Related documentation
+
+Datadog API type of monitor: [https://docs.datadoghq.com/api/?lang=python#create-a-monitor](https://docs.datadoghq.com/api/?lang=python#create-a-monitor)
+
diff --git a/common/filter-tags/inputs.tf b/common/filter-tags/inputs.tf
new file mode 100644
index 0000000..5c4da92
--- /dev/null
+++ b/common/filter-tags/inputs.tf
@@ -0,0 +1,20 @@
+variable "environment" {
+  description = "Architecture Environment"
+  type        = "string"
+}
+
+variable "resource" {
+  description = "The dedicated tag for the resource"
+  type        = "string"
+}
+
+variable "filter_tags_use_defaults" {
+  description = "Use default filter tags convention"
+  default     = "true"
+}
+
+variable "filter_tags_custom" {
+  description = "Tags used for custom filtering when filter_tags_use_defaults is false"
+  default     = "*"
+}
+
diff --git a/common/filter-tags/locals.tf b/common/filter-tags/locals.tf
new file mode 100644
index 0000000..2d3834f
--- /dev/null
+++ b/common/filter-tags/locals.tf
@@ -0,0 +1,4 @@
+locals {
+  filters = "${var.filter_tags_use_defaults == "true" ? format("dd_monitoring:enabled,dd_%s:enabled,env:%s", var.resource, var.environment) : "${var.filter_tags_custom}"}"
+}
+
diff --git a/common/filter-tags/output.tf b/common/filter-tags/output.tf
new file mode 100644
index 0000000..e71c0b9
--- /dev/null
+++ b/common/filter-tags/output.tf
@@ -0,0 +1,10 @@
+output "query_alert" {
+  description = "The full filtering pattern including parentheses for service check monitor type"
+  value       = "{${local.filters}}"
+}
+
+output "service_check" {
+  description = "The full filtering pattern including braces for query alert monitor type"
+  value       = "(\"${replace(local.filters, ",", "\",\"")}\")"
+}
+