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terraform-aws-cloudwatch-events

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Terraform Module for provisioning CloudWatch Events rules connected with targets.

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This is `terraform-aws-cloudwatch-events` module that creates CloudWatch Events rules and according targets.
> Amazon CloudWatch Events delivers a near real-time stream of system events that describe changes in Amazon Web Services (AWS) resources. Using simple rules that you can quickly set up, you can match events and route them to one or more target functions or streams. CloudWatch Events becomes aware of operational changes as they occur. CloudWatch Events responds to these operational changes and takes corrective action as necessary, by sending messages to respond to the environment, activating functions, making changes, and capturing state information.

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## Usage

Here's how to invoke this example module in your projects

```hcl
module "cloudwatch_event" {
  source = "cloudposse/cloudwatch-events/aws"
  version = "0.7.0"

name          = var.name
  namespace     = var.namespace
  tenant        = var.tenant
  environment   = var.environment
  stage         = var.stage

cloudwatch_event_rule_description = var.cloudwatch_event_rule_description
  cloudwatch_event_rule_pattern = var.cloudwatch_event_rule_pattern_json
  cloudwatch_event_target_arn = module.sns.sns_topic.arn
}
```

> [!IMPORTANT]
> In Cloud Posse's examples, we avoid pinning modules to specific versions to prevent discrepancies between the documentation
> and the latest released versions. However, for your own projects, we strongly advise pinning each module to the exact version
> you're using. This practice ensures the stability of your infrastructure. Additionally, we recommend implementing a systematic
> approach for updating versions to avoid unexpected changes.

## Requirements

| Name | Version |
|------|---------|
| <a name="requirement_terraform"></a> [terraform](#requirement\_terraform) | >= 0.13.0 |
| <a name="requirement_aws"></a> [aws](#requirement\_aws) | >= 3.29 |

## Providers

| Name | Version |
|------|---------|
| <a name="provider_aws"></a> [aws](#provider\_aws) | >= 3.29 |

## Modules

| Name | Source | Version |
|------|--------|---------|
| <a name="module_dlq_label"></a> [dlq\_label](#module\_dlq\_label) | cloudposse/label/null | 0.25.0 |
| <a name="module_rule_label"></a> [rule\_label](#module\_rule\_label) | cloudposse/label/null | 0.25.0 |
| <a name="module_this"></a> [this](#module\_this) | cloudposse/label/null | 0.25.0 |

## Resources

| Name | Type |
|------|------|
| [aws_cloudwatch_event_rule.this](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/cloudwatch_event_rule) | resource |
| [aws_cloudwatch_event_target.this](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/cloudwatch_event_target) | resource |
| [aws_sqs_queue.dlq](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/sqs_queue) | resource |
| [aws_sqs_queue_policy.dlq](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/sqs_queue_policy) | resource |
| [aws_iam_policy_document.dlq_policy](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/data-sources/iam_policy_document) | data source |

## Inputs

| Name | Description | Type | Default | Required |
|------|-------------|------|---------|:--------:|
| <a name="input_additional_tag_map"></a> [additional\_tag\_map](#input\_additional\_tag\_map) | Additional key-value pairs to add to each map in `tags_as_list_of_maps`. Not added to `tags` or `id`. This is for some rare cases where resources want additional configuration of tags and therefore take a list of maps with tag key, value, and additional configuration. | `map(string)` | `{}` | no |
| <a name="input_attributes"></a> [attributes](#input\_attributes) | ID element. Additional attributes (e.g. `workers` or `cluster`) to add to `id`, in the order they appear in the list. New attributes are appended to the end of the list. The elements of the list are joined by the `delimiter` and treated as a single ID element. | `list(string)` | `[]` | no |
| <a name="input_cloudwatch_event_rule_description"></a> [cloudwatch\_event\_rule\_description](#input\_cloudwatch\_event\_rule\_description) | The description of the rule. | `string` | `""` | no |
| <a name="input_cloudwatch_event_rule_is_enabled"></a> [cloudwatch\_event\_rule\_is\_enabled](#input\_cloudwatch\_event\_rule\_is\_enabled) | DEPRECATED (use `cloudwatch_event_rule_state` instead): Whether the rule should be enabled. Conflicts with `cloudwatch_event_rule_is_enabled` | `bool` | `null` | no |
| <a name="input_cloudwatch_event_rule_pattern"></a> [cloudwatch\_event\_rule\_pattern](#input\_cloudwatch\_event\_rule\_pattern) | Event pattern described a HCL map which will be encoded as JSON with jsonencode function. See full documentation of CloudWatch Events and Event Patterns for details. http://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/CloudWatchEventsandEventPatterns.html | `any` | n/a | yes |
| <a name="input_cloudwatch_event_rule_state"></a> [cloudwatch\_event\_rule\_state](#input\_cloudwatch\_event\_rule\_state) | State of the rule. Valid values are DISABLED, ENABLED, and ENABLED\_WITH\_ALL\_CLOUDTRAIL\_MANAGEMENT\_EVENTS. When state is ENABLED, the rule is enabled for all events except those delivered by CloudTrail. To also enable the rule for events delivered by CloudTrail, set state to ENABLED\_WITH\_ALL\_CLOUDTRAIL\_MANAGEMENT\_EVENTS. | `string` | `"ENABLED"` | no |
| <a name="input_cloudwatch_event_target_arn"></a> [cloudwatch\_event\_target\_arn](#input\_cloudwatch\_event\_target\_arn) | The Amazon Resource Name (ARN) associated of the target. | `string` | n/a | yes |
| <a name="input_cloudwatch_event_target_id"></a> [cloudwatch\_event\_target\_id](#input\_cloudwatch\_event\_target\_id) | The unique target assignment ID. If missing, will generate a random, unique id. | `string` | `null` | no |
| <a name="input_cloudwatch_event_target_role_arn"></a> [cloudwatch\_event\_target\_role\_arn](#input\_cloudwatch\_event\_target\_role\_arn) | IAM role to be used for this target when the rule is triggered. | `string` | `null` | no |
| <a name="input_context"></a> [context](#input\_context) | Single object for setting entire context at once. See description of individual variables for details. Leave string and numeric variables as `null` to use default value. Individual variable settings (non-null) override settings in context object, except for attributes, tags, and additional\_tag\_map, which are merged. | `any` | <pre>{ "additional_tag_map": {}, "attributes": [], "delimiter": null, "descriptor_formats": {}, "enabled": true, "environment": null, "id_length_limit": null, "label_key_case": null, "label_order": [], "label_value_case": null, "labels_as_tags": [ "unset" ], "name": null, "namespace": null, "regex_replace_chars": null, "stage": null, "tags": {}, "tenant": null }</pre> | no |
| <a name="input_dead_letter_queue_enabled"></a> [dead\_letter\_queue\_enabled](#input\_dead\_letter\_queue\_enabled) | Enable a Dead Letter Queue (SQS) for failed event deliveries. Useful for troubleshooting delivery issues. | `bool` | `false` | no |
| <a name="input_dead_letter_queue_message_retention_seconds"></a> [dead\_letter\_queue\_message\_retention\_seconds](#input\_dead\_letter\_queue\_message\_retention\_seconds) | Number of seconds to retain messages in the Dead Letter Queue. | `number` | `1209600` | no |
| <a name="input_delimiter"></a> [delimiter](#input\_delimiter) | Delimiter to be used between ID elements. Defaults to `-` (hyphen). Set to `""` to use no delimiter at all. | `string` | `null` | no |
| <a name="input_descriptor_formats"></a> [descriptor\_formats](#input\_descriptor\_formats) | Describe additional descriptors to be output in the `descriptors` output map. Map of maps. Keys are names of descriptors. Values are maps of the form `{ format = string labels = list(string) }` (Type is `any` so the map values can later be enhanced to provide additional options.) `format` is a Terraform format string to be passed to the `format()` function. `labels` is a list of labels, in order, to pass to `format()` function. Label values will be normalized before being passed to `format()` so they will be identical to how they appear in `id`. Default is `{}` (`descriptors` output will be empty). | `any` | `{}` | no |
| <a name="input_enabled"></a> [enabled](#input\_enabled) | Set to false to prevent the module from creating any resources | `bool` | `null` | no |
| <a name="input_environment"></a> [environment](#input\_environment) | ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT' | `string` | `null` | no |
| <a name="input_id_length_limit"></a> [id\_length\_limit](#input\_id\_length\_limit) | Limit `id` to this many characters (minimum 6). Set to `0` for unlimited length. Set to `null` for keep the existing setting, which defaults to `0`. Does not affect `id_full`. | `number` | `null` | no |
| <a name="input_label_key_case"></a> [label\_key\_case](#input\_label\_key\_case) | Controls the letter case of the `tags` keys (label names) for tags generated by this module. Does not affect keys of tags passed in via the `tags` input. Possible values: `lower`, `title`, `upper`. Default value: `title`. | `string` | `null` | no |
| <a name="input_label_order"></a> [label\_order](#input\_label\_order) | The order in which the labels (ID elements) appear in the `id`. Defaults to ["namespace", "environment", "stage", "name", "attributes"]. You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present. | `list(string)` | `null` | no |
| <a name="input_label_value_case"></a> [label\_value\_case](#input\_label\_value\_case) | Controls the letter case of ID elements (labels) as included in `id`, set as tag values, and output by this module individually. Does not affect values of tags passed in via the `tags` input. Possible values: `lower`, `title`, `upper` and `none` (no transformation). Set this to `title` and set `delimiter` to `""` to yield Pascal Case IDs. Default value: `lower`. | `string` | `null` | no |
| <a name="input_labels_as_tags"></a> [labels\_as\_tags](#input\_labels\_as\_tags) | Set of labels (ID elements) to include as tags in the `tags` output. Default is to include all labels. Tags with empty values will not be included in the `tags` output. Set to `[]` to suppress all generated tags. **Notes:** The value of the `name` tag, if included, will be the `id`, not the `name`. Unlike other `null-label` inputs, the initial setting of `labels_as_tags` cannot be changed in later chained modules. Attempts to change it will be silently ignored. | `set(string)` | <pre>[ "default" ]</pre> | no |
| <a name="input_name"></a> [name](#input\_name) | ID element. Usually the component or solution name, e.g. 'app' or 'jenkins'. This is the only ID element not also included as a `tag`. The "name" tag is set to the full `id` string. There is no tag with the value of the `name` input. | `string` | `null` | no |
| <a name="input_namespace"></a> [namespace](#input\_namespace) | ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique | `string` | `null` | no |
| <a name="input_regex_replace_chars"></a> [regex\_replace\_chars](#input\_regex\_replace\_chars) | Terraform regular expression (regex) string. Characters matching the regex will be removed from the ID elements. If not set, `"/[^a-zA-Z0-9-]/"` is used to remove all characters other than hyphens, letters and digits. | `string` | `null` | no |
| <a name="input_stage"></a> [stage](#input\_stage) | ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release' | `string` | `null` | no |
| <a name="input_tags"></a> [tags](#input\_tags) | Additional tags (e.g. `{'BusinessUnit': 'XYZ'}`). Neither the tag keys nor the tag values will be modified by this module. | `map(string)` | `{}` | no |
| <a name="input_tenant"></a> [tenant](#input\_tenant) | ID element \_(Rarely used, not included by default)\_. A customer identifier, indicating who this instance of a resource is for | `string` | `null` | no |

## Outputs

| Name | Description |
|------|-------------|
| <a name="output_aws_cloudwatch_event_rule_arn"></a> [aws\_cloudwatch\_event\_rule\_arn](#output\_aws\_cloudwatch\_event\_rule\_arn) | The Amazon Resource Name (ARN) of the rule. |
| <a name="output_aws_cloudwatch_event_rule_id"></a> [aws\_cloudwatch\_event\_rule\_id](#output\_aws\_cloudwatch\_event\_rule\_id) | The name of the rule |
| <a name="output_dead_letter_queue_arn"></a> [dead\_letter\_queue\_arn](#output\_dead\_letter\_queue\_arn) | The ARN of the Dead Letter Queue. |
| <a name="output_dead_letter_queue_url"></a> [dead\_letter\_queue\_url](#output\_dead\_letter\_queue\_url) | The URL of the Dead Letter Queue. |

## Related Projects

Check out these related projects.

- [terraform-aws-sns-topic](https://github.com/cloudposse/terraform-aws-sns-topic) - Terraform Module to Provide an Amazon Simple Notification Service (SNS)
- [terraform-aws-sns-cloudwatch-sns-alarms](https://github.com/cloudposse/terraform-aws-sns-cloudwatch-sns-alarms) - Terraform module that configures CloudWatch SNS alerts for SNS

## References

For additional context, refer to some of these links.

- [What Is Amazon CloudWatch Events?](https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/WhatIsCloudWatchEvents.html) - AWS CloudWatch Events documentation.
- [Terraform `aws_cloudwatch_event_rule` Resource](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/cloudwatch_event_rule) - Provides a CloudWatch Event Rule resource.
- [Terraform `aws_cloudwatch_event_target` Resource](https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/cloudwatch_event_target) - Provides a CloudWatch Event Target resource.

> [!TIP]
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>
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</details>

## ✨ Contributing

This project is under active development, and we encourage contributions from our community.

Many thanks to our outstanding contributors:

For 🐛 bug reports & feature requests, please use the [issue tracker](https://github.com/cloudposse/terraform-aws-cloudwatch-events/issues).

In general, PRs are welcome. We follow the typical "fork-and-pull" Git workflow.
 1. Review our [Code of Conduct](https://github.com/cloudposse/terraform-aws-cloudwatch-events/?tab=coc-ov-file#code-of-conduct) and [Contributor Guidelines](https://github.com/cloudposse/.github/blob/main/CONTRIBUTING.md).
 2. **Fork** the repo on GitHub
 3. **Clone** the project to your own machine
 4. **Commit** changes to your own branch
 5. **Push** your work back up to your fork
 6. Submit a **Pull Request** so that we can review your changes

**NOTE:** Be sure to merge the latest changes from "upstream" before making a pull request!

## Running Terraform Tests

We use [Atmos](https://atmos.tools) to streamline how Terraform tests are run. It centralizes configuration and wraps common test workflows with easy-to-use commands.

All tests are located in the [`test/`](test) folder.

Under the hood, tests are powered by Terratest together with our internal [Test Helpers](https://github.com/cloudposse/test-helpers) library, providing robust infrastructure validation.

Setup dependencies:
- Install Atmos ([installation guide](https://atmos.tools/install/))
- Install Go [1.24+ or newer](https://go.dev/doc/install)
- Install Terraform or OpenTofu

To run tests:

- Run all tests:  
  ```sh
  atmos test run
  ```
- Clean up test artifacts:  
  ```sh
  atmos test clean
  ```
- Explore additional test options:  
  ```sh
  atmos test --help
  ```
The configuration for test commands is centrally managed. To review what's being imported, see the [`atmos.yaml`](https://raw.githubusercontent.com/cloudposse/.github/refs/heads/main/.github/atmos/terraform-module.yaml) file.

Learn more about our [automated testing in our documentation](https://docs.cloudposse.com/community/contribute/automated-testing/) or implementing [custom commands](https://atmos.tools/core-concepts/custom-commands/) with atmos.

### 🌎 Slack Community

Join our [Open Source Community](https://cpco.io/slack?utm_source=github&utm_medium=readme&utm_campaign=cloudposse/terraform-aws-cloudwatch-events&utm_content=slack) on Slack. It's **FREE** for everyone! Our "SweetOps" community is where you get to talk with others who share a similar vision for how to rollout and manage infrastructure. This is the best place to talk shop, ask questions, solicit feedback, and work together as a community to build totally *sweet* infrastructure.

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It's **FREE** for everyone!
## License

<details>
<summary>Preamble to the Apache License, Version 2.0</summary>

Complete license is available in the [`LICENSE`](LICENSE) file.

```text
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
```
</details>

## Trademarks

All other trademarks referenced herein are the property of their respective owners.

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