I would like to run an AWS lambda function every five minutes. In the AWS Management Console this is easy to set up, under the lambda function's "Event Sources" tab, but how do I set it up with Terraform?
I tried to use an aws_lambda_event_source_mapping
resource, but it turns out that the API it uses only supports events from Kinesis and DynamoDB. When I try to use it with a scheduled event source, creation times out.
You can use an aws_cloudwatch_event_target
resource to tie the scheduled event source (event rule) to your lambda function. You need to grant it permission to invoke your lambda function; you can use an aws_lambda_permission
resource for this.
Example:
resource "aws_lambda_function" "check_foo" {
filename = "check_foo.zip"
function_name = "checkFoo"
role = "arn:aws:iam::424242:role/something"
handler = "index.handler"
}
resource "aws_cloudwatch_event_rule" "every_five_minutes" {
name = "every-five-minutes"
description = "Fires every five minutes"
schedule_expression = "rate(5 minutes)"
}
resource "aws_cloudwatch_event_target" "check_foo_every_five_minutes" {
rule = aws_cloudwatch_event_rule.every_five_minutes.name
target_id = "check_foo"
arn = aws_lambda_function.check_foo.arn
}
resource "aws_lambda_permission" "allow_cloudwatch_to_call_check_foo" {
statement_id = "AllowExecutionFromCloudWatch"
action = "lambda:InvokeFunction"
function_name = aws_lambda_function.check_foo.function_name
principal = "events.amazonaws.com"
source_arn = aws_cloudwatch_event_rule.every_five_minutes.arn
}