sns.tf

# ...
resource "aws_sns_topic_subscription" "topic_lambda_sync_bucket_1" {
  topic_arn = "${aws_sns_topic.s3_fanout.arn}"
  protocol  = "lambda"
  endpoint  = "${aws_lambda_function.source_to_target_1_sync.arn}"
}

resource "aws_sns_topic_subscription" "topic_lambda_sync_bucket_2" {
  topic_arn = "${aws_sns_topic.s3_fanout.arn}"
  protocol  = "lambda"
  endpoint  = "${aws_lambda_function.source_to_target_2_sync.arn}"
}