Trello Notifications

Integrate your SNS notifications into Trello via a Node.js Lambda function.

Terraform

The following Terraform creates a Lambda function and subscribes it to an SNS topic.

resource "aws_iam_role" "iam_for_lambda" {  name = "${terraform.workspace}-iam_for_lambda"
  assume_role_policy = <<EOF{  "Version": "2012-10-17",  "Statement": [    {      "Action": "sts:AssumeRole",      "Principal": {        "Service": "lambda.amazonaws.com"      },      "Effect": "Allow",      "Sid": ""    }  ]}EOF}
resource "aws_lambda_function" "notify_trello_lambda" {  filename      = "trello-lambda/src/trello-lambda.zip"  function_name = "${terraform.workspace}-notify-trello"  role          = aws_iam_role.iam_for_lambda.arn  handler       = "index.handler"
  source_code_hash = filebase64sha256("trello-lambda/src/trello-lambda.zip")
  runtime = "nodejs12.x"
  environment {    variables = {      trelloToken  = var.trello_token      trelloApiKey = var.trello_api_key      trelloListId = var.trello_list_id    }  }}
resource "aws_lambda_permission" "with_sns_technical_alerts" {  statement_id  = "AllowExecutionFromSNSTechnicalAlerts"  action        = "lambda:InvokeFunction"  function_name = aws_lambda_function.notify_trello_lambda.arn  principal     = "sns.amazonaws.com"  source_arn    = aws_sns_topic.sns_technical_alerts.arn}
resource "aws_sns_topic_subscription" "sns_technical_alerts_lambda_subscription" {  topic_arn = aws_sns_topic.sns_technical_alerts.arn  protocol  = "lambda"  endpoint  = aws_lambda_function.notify_trello_lambda.arn}

Lambda

The Lambda is delivered to AWS within a zip and can be edited, built and tested from the AWS console.

I've included an example of a JSON CloudWatch Alert delivered via SNS which can be used as a test data within the AWS console.

However to develop the Lambda function i've included a self contained project with using the Jest test framework which mocks out the trello API allowing local development without deployment.

This README below has instructions on how to build and run the Lambda locally but also how to integrate with Trello and deploy into AWS.