schedule.tf

locals {
  schedule_expression = "rate(${var.period_minutes} minutes)"
}

resource "aws_cloudwatch_event_rule" "schedule" {
  name                = "${var.function_name}-schedule"
  description         = "${var.function_name} trigger schedule"
  schedule_expression = local.schedule_expression
}

resource "aws_cloudwatch_event_target" "lambda_target" {
  rule      = aws_cloudwatch_event_rule.schedule.name
  target_id = "${var.function_name}-schedule-target"
  arn       = aws_lambda_function.lambda.arn
}

resource "aws_lambda_permission" "allow_cloudwatch_to_call_lambda" {
  statement_id  = "AllowExecutionFromCloudWatch"
  action        = "lambda:InvokeFunction"
  function_name = aws_lambda_function.lambda.function_name
  principal     = "events.amazonaws.com"
  source_arn    = aws_cloudwatch_event_rule.schedule.arn
}