How can I inject a Terraform resource into my Lambda code?

Question

I've got a Terraform file that creates an AWS Lambda and an AWS SNS Topic. The lambda sends a message to the SNS topic. At the moment I have hardcoded the ARN for the SNS Topic in the lambda. Is there anyway of getting the lambda to pickup the ARN from Terraform instead?

Tommy · Accepted Answer · 2019-07-03 23:15:50Z

1

I would create an environment variable for your lambda containing the ARN of your SNS topic. Then lambda function can read that variable and use it accordingly.

answered Jul 3, 2019 at 23:15

Tommy

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Comments

Chandan · Accepted Answer · 2022-06-30 07:11:53Z

I found something that might help you or give you an idea, but SQS is also used in that Terraform.

#resources.tf

resource "aws_sns_topic" "results_updates" {
    name = "results-updates-topic"
}

resource "aws_sqs_queue" "results_updates_queue" {
    name = "results-updates-queue"
    redrive_policy  = "{\"deadLetterTargetArn\":\"${aws_sqs_queue.results_updates_dl_queue.arn}\",\"maxReceiveCount\":5}"
    visibility_timeout_seconds = 300

    tags = {
        Environment = "dev"
    }
}

resource "aws_sqs_queue" "results_updates_dl_queue" {
    name = "results-updates-dl-queue"
}

resource "aws_sns_topic_subscription" "results_updates_sqs_target" {
    topic_arn = "${aws_sns_topic.results_updates.arn}"
    protocol  = "sqs"
    endpoint  = "${aws_sqs_queue.results_updates_queue.arn}"
}

Hope this helps :)

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