variables.tf

variable "aws_region" {
  description = "AWS region."
  type        = string
}

variable "vpc_id" {
  description = "The VPC for security groups of the action runners."
  type        = string
}

variable "subnet_ids" {
  description = "List of subnets in which the action runners will be launched, the subnets needs to be subnets in the `vpc_id`."
  type        = list(string)
}

variable "tags" {
  description = "Map of tags that will be added to created resources. By default resources will be tagged with name and environment."
  type        = map(string)
  default     = {}
}

variable "environment" {
  description = "DEPRECATED, no longer used. See `prefix`"
  type        = string
  default     = null

  validation {
    condition     = var.environment == null
    error_message = "The \"environment\" variable is no longer used. To migrate, set the \"prefix\" variable to the original value of \"environment\" and optionally, add \"Environment\" to the \"tags\" variable map with the same value."
  }
}

variable "prefix" {
  description = "The prefix used for naming resources"
  type        = string
  default     = "github-actions"
}

variable "enable_organization_runners" {
  description = "Register runners to organization, instead of repo level"
  type        = bool
  default     = false
}

variable "github_app" {
  description = "GitHub app parameters, see your github app. Ensure the key is the base64-encoded `.pem` file (the output of `base64 app.private-key.pem`, not the content of `private-key.pem`)."
  type = object({
    key_base64     = string
    id             = string
    webhook_secret = string
  })
}

variable "scale_down_schedule_expression" {
  description = "Scheduler expression to check every x for scale down."
  type        = string
  default     = "cron(*/5 * * * ? *)"
}

variable "minimum_running_time_in_minutes" {
  description = "The time an ec2 action runner should be running at minimum before terminated if not busy."
  type        = number
  default     = null
}

variable "runner_boot_time_in_minutes" {
  description = "The minimum time for an EC2 runner to boot and register as a runner."
  type        = number
  default     = 5
}

variable "runner_extra_labels" {
  description = "Extra (custom) labels for the runners (GitHub). Separate each label by a comma. Labels checks on the webhook can be enforced by setting `enable_workflow_job_labels_check`. GitHub read-only labels should not be provided."
  type        = string
  default     = ""
}

variable "runner_group_name" {
  description = "Name of the runner group."
  type        = string
  default     = "Default"
}

variable "scale_up_reserved_concurrent_executions" {
  description = "Amount of reserved concurrent executions for the scale-up lambda function. A value of 0 disables lambda from being triggered and -1 removes any concurrency limitations."
  type        = number
  default     = 1
}

variable "webhook_lambda_zip" {
  description = "File location of the webhook lambda zip file."
  type        = string
  default     = null
}

variable "webhook_lambda_timeout" {
  description = "Time out of the webhook lambda in seconds."
  type        = number
  default     = 10
}

variable "runners_lambda_zip" {
  description = "File location of the lambda zip file for scaling runners."
  type        = string
  default     = null
}

variable "runners_scale_up_lambda_timeout" {
  description = "Time out for the scale up lambda in seconds."
  type        = number
  default     = 30
}

variable "runners_scale_down_lambda_timeout" {
  description = "Time out for the scale down lambda in seconds."
  type        = number
  default     = 60
}

variable "runner_binaries_syncer_lambda_zip" {
  description = "File location of the binaries sync lambda zip file."
  type        = string
  default     = null
}

variable "runner_binaries_syncer_lambda_timeout" {
  description = "Time out of the binaries sync lambda in seconds."
  type        = number
  default     = 300
}

variable "runner_binaries_s3_sse_configuration" {
  description = "Map containing server-side encryption configuration for runner-binaries S3 bucket."
  type        = any
  default     = {}
}

variable "runner_binaries_s3_logging_bucket" {
  description = "Bucket for action runner distribution bucket access logging."
  type        = string
  default     = null

  # Make sure the bucket name only contains legal characters
  validation {
    error_message = "Only lowercase alphanumeric characters and hyphens allowed in the bucket name."
    condition     = var.runner_binaries_s3_logging_bucket == null || can(regex("^[a-z0-9-]*$", var.runner_binaries_s3_logging_bucket))
  }
}

variable "runner_binaries_s3_logging_bucket_prefix" {
  description = "Bucket prefix for action runner distribution bucket access logging."
  type        = string
  default     = null

  # Make sure the bucket prefix only contains legal characters
  validation {
    error_message = "Only alphanumeric characters, hyphens followed by single slashes allowed in the bucket prefix."
    condition     = var.runner_binaries_s3_logging_bucket_prefix == null || can(regex("^(([a-zA-Z0-9-])+(\\/?))*$", var.runner_binaries_s3_logging_bucket_prefix))
  }
}


variable "role_permissions_boundary" {
  description = "Permissions boundary that will be added to the created roles."
  type        = string
  default     = null
}

variable "role_path" {
  description = "The path that will be added to role path for created roles, if not set the environment name will be used."
  type        = string
  default     = null
}

variable "instance_profile_path" {
  description = "The path that will be added to the instance_profile, if not set the environment name will be used."
  type        = string
  default     = null
}

variable "runner_as_root" {
  description = "Run the action runner under the root user. Variable `runner_run_as` will be ignored."
  type        = bool
  default     = false
}

variable "runner_run_as" {
  description = "Run the GitHub actions agent as user."
  type        = string
  default     = "ec2-user"
}

variable "runners_maximum_count" {
  description = "The maximum number of runners that will be created."
  type        = number
  default     = 3
}

variable "kms_key_arn" {
  description = "Optional CMK Key ARN to be used for Parameter Store. This key must be in the current account."
  type        = string
  default     = null
}

variable "enable_runner_detailed_monitoring" {
  description = "Should detailed monitoring be enabled for the runner. Set this to true if you want to use detailed monitoring. See https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-cloudwatch-new.html for details."
  type        = bool
  default     = false
}

variable "enable_userdata" {
  description = "Should the userdata script be enabled for the runner. Set this to false if you are using your own prebuilt AMI."
  type        = bool
  default     = true
}

variable "userdata_template" {
  description = "Alternative user-data template, replacing the default template. By providing your own user_data you have to take care of installing all required software, including the action runner. Variables userdata_pre/post_install are ignored."
  type        = string
  default     = null
}

variable "userdata_pre_install" {
  type        = string
  default     = ""
  description = "Script to be ran before the GitHub Actions runner is installed on the EC2 instances"
}

variable "userdata_post_install" {
  type        = string
  default     = ""
  description = "Script to be ran after the GitHub Actions runner is installed on the EC2 instances"
}

variable "idle_config" {
  description = "List of time period that can be defined as cron expression to keep a minimum amount of runners active instead of scaling down to 0. By defining this list you can ensure that in time periods that match the cron expression within 5 seconds a runner is kept idle."
  type = list(object({
    cron      = string
    timeZone  = string
    idleCount = number
  }))
  default = []
}

variable "enable_ssm_on_runners" {
  description = "Enable to allow access the runner instances for debugging purposes via SSM. Note that this adds additional permissions to the runner instances."
  type        = bool
  default     = false
}

variable "logging_retention_in_days" {
  description = "Specifies the number of days you want to retain log events for the lambda log group. Possible values are: 0, 1, 3, 5, 7, 14, 30, 60, 90, 120, 150, 180, 365, 400, 545, 731, 1827, and 3653."
  type        = number
  default     = 180
}

variable "logging_kms_key_id" {
  description = "Specifies the kms key id to encrypt the logs with"
  type        = string
  default     = null
}

variable "runner_allow_prerelease_binaries" {
  description = "(Deprecated, no longer used), allow the runners to update to prerelease binaries."
  type        = bool
  default     = null

  validation {
    condition     = var.runner_allow_prerelease_binaries == null
    error_message = "The \"runner_allow_prerelease_binaries\" variable is no longer used. GitHub runners are not released as pre-release, only releases should be used."
  }
}

variable "block_device_mappings" {
  description = "The EC2 instance block device configuration. Takes the following keys: `device_name`, `delete_on_termination`, `volume_type`, `volume_size`, `encrypted`, `iops`, `throughput`, `kms_key_id`, `snapshot_id`."
  type = list(object({
    delete_on_termination = optional(bool, true)
    device_name           = optional(string, "/dev/xvda")
    encrypted             = optional(bool, true)
    iops                  = optional(number)
    kms_key_id            = optional(string)
    snapshot_id           = optional(string)
    throughput            = optional(number)
    volume_size           = number
    volume_type           = optional(string, "gp3")
  }))
  default = [{
    volume_size = 30
  }]
}

variable "ami_filter" {
  description = "List of maps used to create the AMI filter for the action runner AMI. By default amazon linux 2 is used."
  type        = map(list(string))
  default     = null
}

variable "ami_owners" {
  description = "The list of owners used to select the AMI of action runner instances."
  type        = list(string)
  default     = ["amazon"]
}

variable "ami_id_ssm_parameter_name" {
  description = "Externally managed SSM parameter (of data type aws:ec2:image) that contains the AMI ID to launch runner instances from. Overrides ami_filter"
  type        = string
  default     = null
}

variable "lambda_s3_bucket" {
  description = "S3 bucket from which to specify lambda functions. This is an alternative to providing local files directly."
  type        = string
  default     = null
}

variable "syncer_lambda_s3_key" {
  description = "S3 key for syncer lambda function. Required if using S3 bucket to specify lambdas."
  type        = string
  default     = null
}

variable "syncer_lambda_s3_object_version" {
  description = "S3 object version for syncer lambda function. Useful if S3 versioning is enabled on source bucket."
  type        = string
  default     = null
}

variable "webhook_lambda_s3_key" {
  description = "S3 key for webhook lambda function. Required if using S3 bucket to specify lambdas."
  type        = string
  default     = null
}

variable "webhook_lambda_s3_object_version" {
  description = "S3 object version for webhook lambda function. Useful if S3 versioning is enabled on source bucket."
  type        = string
  default     = null
}

variable "webhook_lambda_apigateway_access_log_settings" {
  type = object({
    destination_arn = string
    format          = string
  })
  default = null
}

variable "runners_lambda_s3_key" {
  description = "S3 key for runners lambda function. Required if using S3 bucket to specify lambdas."
  type        = string
  default     = null
}

variable "runners_lambda_s3_object_version" {
  description = "S3 object version for runners lambda function. Useful if S3 versioning is enabled on source bucket."
  type        = string
  default     = null
}

variable "create_service_linked_role_spot" {
  description = "(optional) create the serviced linked role for spot instances that is required by the scale-up lambda."
  type        = bool
  default     = false
}

variable "runner_iam_role_managed_policy_arns" {
  description = "Attach AWS or customer-managed IAM policies (by ARN) to the runner IAM role"
  type        = list(string)
  default     = []
}

variable "enable_cloudwatch_agent" {
  description = "Enabling the cloudwatch agent on the ec2 runner instances, the runner contains default config. Configuration can be overridden via `cloudwatch_config`."
  type        = bool
  default     = true
}

variable "cloudwatch_config" {
  description = "(optional) Replaces the module default cloudwatch log config. See https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-Agent-Configuration-File-Details.html for details."
  type        = string
  default     = null
}

variable "runner_log_files" {
  description = "(optional) Replaces the module default cloudwatch log config. See https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CloudWatch-Agent-Configuration-File-Details.html for details."
  type = list(object({
    log_group_name   = string
    prefix_log_group = bool
    file_path        = string
    log_stream_name  = string
  }))
  default = null
}

variable "ghes_url" {
  description = "GitHub Enterprise Server URL. Example: https://github.internal.co - DO NOT SET IF USING PUBLIC GITHUB"
  type        = string
  default     = null
}

variable "ghes_ssl_verify" {
  description = "GitHub Enterprise SSL verification. Set to 'false' when custom certificate (chains) is used for GitHub Enterprise Server (insecure)."
  type        = bool
  default     = true
}

variable "lambda_subnet_ids" {
  description = "List of subnets in which the action runners will be launched, the subnets needs to be subnets in the `vpc_id`."
  type        = list(string)
  default     = []
}

variable "lambda_security_group_ids" {
  description = "List of security group IDs associated with the Lambda function."
  type        = list(string)
  default     = []
}

variable "key_name" {
  description = "Key pair name"
  type        = string
  default     = null
}

variable "runner_additional_security_group_ids" {
  description = "(optional) List of additional security groups IDs to apply to the runner"
  type        = list(string)
  default     = []
}

variable "instance_target_capacity_type" {
  description = "Default lifecycle used for runner instances, can be either `spot` or `on-demand`."
  type        = string
  default     = "spot"
  validation {
    condition     = contains(["spot", "on-demand"], var.instance_target_capacity_type)
    error_message = "The instance target capacity should be either spot or on-demand."
  }
}

variable "instance_allocation_strategy" {
  description = "The allocation strategy for spot instances. AWS recommends to use `price-capacity-optimized` however the AWS default is `lowest-price`."
  type        = string
  default     = "lowest-price"
  validation {
    condition     = contains(["lowest-price", "diversified", "capacity-optimized", "capacity-optimized-prioritized", "price-capacity-optimized"], var.instance_allocation_strategy)
    error_message = "The instance allocation strategy does not match the allowed values."
  }
}

variable "instance_max_spot_price" {
  description = "Max price price for spot intances per hour. This variable will be passed to the create fleet as max spot price for the fleet."
  type        = string
  default     = null
}

variable "instance_types" {
  description = "List of instance types for the action runner. Defaults are based on runner_os (amzn2 for linux and Windows Server Core for win)."
  type        = list(string)
  default     = ["m5.large", "c5.large"]
}

variable "repository_white_list" {
  description = "List of repositories allowed to use the github app"
  type        = list(string)
  default     = []
}

variable "delay_webhook_event" {
  description = "The number of seconds the event accepted by the webhook is invisible on the queue before the scale up lambda will receive the event."
  type        = number
  default     = 30
}
variable "job_queue_retention_in_seconds" {
  description = "The number of seconds the job is held in the queue before it is purged"
  type        = number
  default     = 86400
}
variable "runner_egress_rules" {
  description = "List of egress rules for the GitHub runner instances."
  type = list(object({
    cidr_blocks      = list(string)
    ipv6_cidr_blocks = list(string)
    prefix_list_ids  = list(string)
    from_port        = number
    protocol         = string
    security_groups  = list(string)
    self             = bool
    to_port          = number
    description      = string
  }))
  default = [{
    cidr_blocks      = ["0.0.0.0/0"]
    ipv6_cidr_blocks = ["::/0"]
    prefix_list_ids  = null
    from_port        = 0
    protocol         = "-1"
    security_groups  = null
    self             = null
    to_port          = 0
    description      = null
  }]
}

variable "log_type" {
  description = "Logging format for lambda logging. Valid values are 'json', 'pretty', 'hidden'. "
  type        = string
  default     = "pretty"
  validation {
    condition = anytrue([
      var.log_type == "json",
      var.log_type == "pretty",
      var.log_type == "hidden",
    ])
    error_message = "`log_type` value not valid. Valid values are 'json', 'pretty', 'hidden'."
  }
}

variable "log_level" {
  description = "Logging level for lambda logging. Valid values are  'silly', 'trace', 'debug', 'info', 'warn', 'error', 'fatal'."
  type        = string
  default     = "info"
  validation {
    condition = anytrue([
      var.log_level == "silly",
      var.log_level == "trace",
      var.log_level == "debug",
      var.log_level == "info",
      var.log_level == "warn",
      var.log_level == "error",
      var.log_level == "fatal",
    ])
    error_message = "`log_level` value not valid. Valid values are 'silly', 'trace', 'debug', 'info', 'warn', 'error', 'fatal'."
  }
}

variable "enable_runner_workflow_job_labels_check_all" {
  description = "If set to true all labels in the workflow job must match the GitHub labels (os, architecture and `self-hosted`). When false if __any__ label matches it will trigger the webhook."
  type        = bool
  default     = true
}

variable "runner_ec2_tags" {
  description = "Map of tags that will be added to the launch template instance tag specifications."
  type        = map(string)
  default     = {}
}

variable "runner_metadata_options" {
  description = "Metadata options for the ec2 runner instances. By default, the module uses metadata tags for bootstrapping the runner, only disable `instance_metadata_tags` when using custom scripts for starting the runner."
  type        = map(any)
  default = {
    instance_metadata_tags      = "enabled"
    http_endpoint               = "enabled"
    http_tokens                 = "optional"
    http_put_response_hop_limit = 1
  }
}

variable "enable_ephemeral_runners" {
  description = "Enable ephemeral runners, runners will only be used once."
  type        = bool
  default     = false
}

variable "enable_job_queued_check" {
  description = "Only scale if the job event received by the scale up lambda is is in the state queued. By default enabled for non ephemeral runners and disabled for ephemeral. Set this variable to overwrite the default behavior."
  type        = bool
  default     = null
}

variable "enable_managed_runner_security_group" {
  description = "Enabling the default managed security group creation. Unmanaged security groups can be specified via `runner_additional_security_group_ids`."
  type        = bool
  default     = true
}

variable "runner_os" {
  description = "The EC2 Operating System type to use for action runner instances (linux,windows)."
  type        = string
  default     = "linux"

  validation {
    condition     = contains(["linux", "windows"], var.runner_os)
    error_message = "Valid values for runner_os are (linux, windows)."
  }
}

variable "lambda_principals" {
  description = "(Optional) add extra principals to the role created for execution of the lambda, e.g. for local testing."
  type = list(object({
    type        = string
    identifiers = list(string)
  }))
  default = []
}

variable "enable_fifo_build_queue" {
  description = "Enable a FIFO queue to remain the order of events received by the webhook. Suggest to set to true for repo level runners."
  type        = bool
  default     = false
}

variable "redrive_build_queue" {
  description = "Set options to attach (optional) a dead letter queue to the build queue, the queue between the webhook and the scale up lambda. You have the following options. 1. Disable by setting `enabled` to false. 2. Enable by setting `enabled` to `true`, `maxReceiveCount` to a number of max retries."
  type = object({
    enabled         = bool
    maxReceiveCount = number
  })
  default = {
    enabled         = false
    maxReceiveCount = null
  }
  validation {
    condition     = var.redrive_build_queue.enabled && var.redrive_build_queue.maxReceiveCount != null || !var.redrive_build_queue.enabled
    error_message = "Ensure you have set the maxReceiveCount when enabled."
  }
}

variable "runner_architecture" {
  description = "The platform architecture of the runner instance_type."
  type        = string
  default     = "x64"
  validation {
    condition     = contains(["x64", "arm64"], var.runner_architecture)
    error_message = "`runner_architecture` value not valid, valid values are: `x64` and `arm64`."
  }
}

variable "pool_lambda_timeout" {
  description = "Time out for the pool lambda in seconds."
  type        = number
  default     = 60
}

variable "pool_runner_owner" {
  description = "The pool will deploy runners to the GitHub org ID, set this value to the org to which you want the runners deployed. Repo level is not supported."
  type        = string
  default     = null
}

variable "pool_lambda_reserved_concurrent_executions" {
  description = "Amount of reserved concurrent executions for the scale-up lambda function. A value of 0 disables lambda from being triggered and -1 removes any concurrency limitations."
  type        = number
  default     = 1
}

variable "pool_config" {
  description = "The configuration for updating the pool. The `pool_size` to adjust to by the events triggered by the `schedule_expression`. For example you can configure a cron expression for week days to adjust the pool to 10 and another expression for the weekend to adjust the pool to 1."
  type = list(object({
    schedule_expression = string
    size                = number
  }))
  default = []
}

variable "aws_partition" {
  description = "(optiona) partition in the arn namespace to use if not 'aws'"
  type        = string
  default     = "aws"
}

variable "disable_runner_autoupdate" {
  description = "Disable the auto update of the github runner agent. Be-aware there is a grace period of 30 days, see also the [GitHub article](https://github.blog/changelog/2022-02-01-github-actions-self-hosted-runners-can-now-disable-automatic-updates/)"
  type        = bool
  default     = false
}

variable "lambda_runtime" {
  description = "AWS Lambda runtime."
  type        = string
  default     = "nodejs18.x"
}

variable "lambda_architecture" {
  description = "AWS Lambda architecture. Lambda functions using Graviton processors ('arm64') tend to have better price/performance than 'x86_64' functions. "
  type        = string
  default     = "arm64"
  validation {
    condition     = contains(["arm64", "x86_64"], var.lambda_architecture)
    error_message = "`lambda_architecture` value is not valid, valid values are: `arm64` and `x86_64`."
  }
}

variable "enable_workflow_job_events_queue" {
  description = "Enabling this experimental feature will create a secondory sqs queue to wich a copy of the workflow_job event will be delivered."
  type        = bool
  default     = false
}

variable "workflow_job_queue_configuration" {
  description = "Configuration options for workflow job queue which is only applicable if the flag enable_workflow_job_events_queue is set to true."
  type = object({
    delay_seconds              = number
    visibility_timeout_seconds = number
    message_retention_seconds  = number
  })
  default = {
    "delay_seconds" : null,
    "visibility_timeout_seconds" : null,
    "message_retention_seconds" : null
  }
}
variable "enable_runner_binaries_syncer" {
  description = "Option to disable the lambda to sync GitHub runner distribution, useful when using a pre-build AMI."
  type        = bool
  default     = true
}

variable "queue_encryption" {
  description = "Configure how data on queues managed by the modules in ecrypted at REST. Options are encryped via SSE, non encrypted and via KMSS. By default encryptes via SSE is enabled. See for more details the Terraform `aws_sqs_queue` resource https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/sqs_queue."
  type = object({
    kms_data_key_reuse_period_seconds = number
    kms_master_key_id                 = string
    sqs_managed_sse_enabled           = bool
  })
  default = {
    kms_data_key_reuse_period_seconds = null
    kms_master_key_id                 = null
    sqs_managed_sse_enabled           = true
  }
  validation {
    condition     = var.queue_encryption == null || var.queue_encryption.sqs_managed_sse_enabled != null && var.queue_encryption.kms_master_key_id == null && var.queue_encryption.kms_data_key_reuse_period_seconds == null || var.queue_encryption.sqs_managed_sse_enabled == null && var.queue_encryption.kms_master_key_id != null
    error_message = "Invalid configuration for `queue_encryption`. Valid configurations are encryption disabled, enabled via SSE. Or encryption via KMS."
  }
}

variable "enable_user_data_debug_logging_runner" {
  description = "Option to enable debug logging for user-data, this logs all secrets as well."
  type        = bool
  default     = false
}

variable "ssm_paths" {
  description = "The root path used in SSM to store configuration and secreets."
  type = object({
    root       = optional(string, "github-action-runners")
    app        = optional(string, "app")
    runners    = optional(string, "runners")
    use_prefix = optional(bool, true)
  })
  default = {}
}