xhens / terraform-google-event-function

Terraform module for responding to logging events with a function

Event Function

This module configures a system which responds to events by invoking a Cloud Functions function.

The root module configures a function sourced from a directory on localhost to respond to a given event trigger. The source directory is compressed and uploaded as a Cloud Storage bucket object which will be leveraged by the function.

Alternatively, the repository-function submodule configures a function sourced from a Cloud Source Repositories repository.

Compatibility

This module is meant for use with Terraform 0.13+ and tested using Terraform 1.0+. If you find incompatibilities using Terraform >=0.13, please open an issue.

If you haven't upgraded and need a Terraform 0.12.x-compatible version of this module, the last released version intended for Terraform 0.12.x is v1.6.0.

Usage

The automatic-labelling-from-localhost example is a tested reference of how to use the root module with the event-project-log-entry submodule.

Terraform Created Source Files

If you have local_file Terraform resources that need to be included in the function's archive include them in the optional source_dependent_files.

This will tell the module to wait until those files exist before creating the archive.

Example can also be seen in examples/dynamic-files

resource "local_file" "file" {
  content  = "some content"
  filename = "${path.module}/function_source/terraform_created_file.txt"
}

module "localhost_function" {
  ...

  source_dependent_files = [local_file.file]
}

Inputs

Name	Description	Type	Default	Required
available_memory_mb	The amount of memory in megabytes allotted for the function to use.	number	256	no
bucket_force_destroy	When deleting the GCS bucket containing the cloud function, delete all objects in the bucket first.	bool	false	no
bucket_labels	A set of key/value label pairs to assign to the function source archive bucket.	map(string)	{}	no
bucket_name	The name to apply to the bucket. Will default to a string of the function name.	string	""	no
create_bucket	Whether to create a new bucket or use an existing one. If false, bucket_name should reference the name of the alternate bucket to use.	bool	true	no
description	The description of the function.	string	"Processes events."	no
entry_point	The name of a method in the function source which will be invoked when the function is executed.	string	n/a	yes
environment_variables	A set of key/value environment variable pairs to assign to the function.	map(string)	{}	no
event_trigger	A source that fires events in response to a condition in another service.	map(string)	{}	no
event_trigger_failure_policy_retry	A toggle to determine if the function should be retried on failure.	bool	false	no
files_to_exclude_in_source_dir	Specify files to ignore when reading the source_dir	list(string)	[]	no
ingress_settings	The ingress settings for the function. Allowed values are ALLOW_ALL, ALLOW_INTERNAL_AND_GCLB and ALLOW_INTERNAL_ONLY. Changes to this field will recreate the cloud function.	string	"ALLOW_ALL"	no
labels	A set of key/value label pairs to assign to the Cloud Function.	map(string)	{}	no
max_instances	The maximum number of parallel executions of the function.	number	0	no
name	The name to apply to any nameable resources.	string	n/a	yes
project_id	The ID of the project to which resources will be applied.	string	n/a	yes
region	The region in which resources will be applied.	string	n/a	yes
runtime	The runtime in which the function will be executed.	string	n/a	yes
service_account_email	The service account to run the function as.	string	""	no
source_dependent_files	A list of any Terraform created local_files that the module will wait for before creating the archive.	list(object({ filename = string id = string }))	[]	no
source_directory	The pathname of the directory which contains the function source code.	string	n/a	yes
timeout_s	The amount of time in seconds allotted for the execution of the function.	number	60	no
trigger_http	Wheter to use HTTP trigger instead of the event trigger.	bool	null	no
vpc_connector	The VPC Network Connector that this cloud function can connect to. It should be set up as fully-qualified URI. The format of this field is projects/*/locations/*/connectors/*.	string	null	no
vpc_connector_egress_settings	The egress settings for the connector, controlling what traffic is diverted through it. Allowed values are ALL_TRAFFIC and PRIVATE_RANGES_ONLY. If unset, this field preserves the previously set value.	string	null	no

Outputs

Name	Description
https_trigger_url	URL which triggers function execution.
name	The name of the function.

Requirements

The following sections describe the requirements which must be met in order to invoke this module.

Software Dependencies

The following software dependencies must be installed on the system from which this module will be invoked:

• Terraform >= 0.13.0
• [Terraform Provider for Archive][terraform-provider-archive-site]
• Terraform Provider for Google Cloud Platform

IAM Roles

The Service Account which will be used to invoke this module must have the following IAM roles:

• Cloud Functions Developer: roles/cloudfunctions.developer
• Storage Admin: roles/storage.admin

APIs

The project against which this module will be invoked must have the following APIs enabled:

• Cloud Functions API: cloudfunctions.googleapis.com
• Cloud Storage API: storage-component.googleapis.com

The Project Factory module can be used to provision projects with specific APIs activated.

Contributing

Refer to the contribution guidelines for information on contributing to this module.