aws_lambda_cronjob

aws_lambda_cronjob

This module creates a Lambda function, and configures it to be invoked on a schedule.

Example 1: Simple cronjob

First, write down some simple code to deploy in a file called index.js:

exports.handler = function(event, context, callback) {
  console.log("Lambda function event:", event);
  console.log("Lambda function context:", context);
  callback(null);
};

Assuming you have the AWS provider set up:

# Lambda functions can only be uploaded as ZIP files, so we need to package our JS file into one
data "archive_file" "lambda_zip" {
  type        = "zip"
  source_file = "${path.module}/index.js"
  output_path = "${path.module}/lambda.zip"
}

module "my_cronjob" {
  # Available inputs: https://github.com/futurice/terraform-utils/tree/master/aws_lambda_cronjob#inputs
  # Check for updates: https://github.com/futurice/terraform-utils/compare/v11.0...master
  source = "git::ssh://[email protected]/futurice/terraform-utils.git//aws_lambda_cronjob?ref=v11.0"

  cronjob_name           = "my-cronjob"
  schedule_expression    = "rate(5 minutes)" # note: full cron expressions are also supported
  lambda_logging_enabled = true

  # lambda_zip.output_path will be absolute, i.e. different on different machines.
  # This can cause Terraform to notice differences that aren't actually there, so let's convert it to a relative one.
  # https://github.com/hashicorp/terraform/issues/7613#issuecomment-332238441
  function_zipfile = "${substr(data.archive_file.lambda_zip.output_path, length(path.cwd) + 1, -1)}"
}

After terraform apply, because we included the lambda_logging_enabled option, you can log into CloudWatch and check out the properties Lambda makes available in the event and context properties.

Example 2: Other options for deploying code

As this module is a close relative of aws_lambda_api, the other options for deploying code are equally applicable here.

Inputs

Name	Description	Type	Default	Required
comment_prefix	This will be included in comments for resources that are created	string	"Lambda Cronjob: "	no
cronjob_name	Name which will be used to create your Lambda function (e.g. "my-important-cronjob")	string	n/a	yes
function_env_vars	Which env vars (if any) to invoke the Lambda with	map	<map>	no
function_handler	Instructs Lambda on which function to invoke within the ZIP file	string	"index.handler"	no
function_runtime	Which node.js version should Lambda use for this function	string	"nodejs8.10"	no
function_s3_bucket	When provided, the zipfile is retrieved from an S3 bucket by this name instead (filename is still provided via function_zipfile)	string	""	no
function_timeout	The amount of time your Lambda Function has to run in seconds	string	"3"	no
function_zipfile	Path to a ZIP file that will be installed as the Lambda function (e.g. "my-cronjob.zip")	string	n/a	yes
lambda_logging_enabled	When true, writes any console output to the Lambda function's CloudWatch group	string	"false"	no
memory_size	Amount of memory in MB your Lambda Function can use at runtime	string	"128"	no
name_prefix	Name prefix to use for objects that need to be created (only lowercase alphanumeric characters and hyphens allowed, for S3 bucket name compatibility)	string	"aws-lambda-cronjob---"	no
schedule_expression	How often to run the Lambda (see https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/ScheduledEvents.html); e.g. "rate(15 minutes)" or "cron(0 12 * * ? *)"	string	"rate(60 minutes)"	no
tags	AWS Tags to add to all resources created (where possible); see https://aws.amazon.com/answers/account-management/aws-tagging-strategies/	map	<map>	no

Outputs

Name	Description
function_name	This is the unique name of the Lambda function that was created