# aws-lambda-suppressor

**Repository Path**: mirrors_barchart/aws-lambda-suppressor

## Basic Information

- **Project Name**: aws-lambda-suppressor
- **Description**: JavaScript utility for suppressing duplicate AWS Lambda invocations
- **Primary Language**: Unknown
- **License**: MIT
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2020-08-08
- **Last Updated**: 2026-03-07

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# @barchart/aws-lambda-suppressor

[![AWS CodeBuild](https://codebuild.us-east-1.amazonaws.com/badges?uuid=eyJlbmNyeXB0ZWREYXRhIjoiQnhYblNFR25BSGFCbjUxZVBwWUhIQUFuSVJCcEkvN1BsYWlzUTZQZWhSM2F4RUsyN3pHZEpuQWZpTVAwd3RlRkpKMWQzQVU5RXYxb2hPaHloeGtGUEg4PSIsIml2UGFyYW1ldGVyU3BlYyI6ImdlTjU5Ujk5L1lyeXVLdTUiLCJtYXRlcmlhbFNldFNlcmlhbCI6MX0%3D&branch=master)](https://github.com/barchart/aws-lambda-suppressor)
[![NPM](https://img.shields.io/npm/v/@barchart/aws-lambda-suppressor)](https://www.npmjs.com/package/@barchart/aws-lambda-suppressor)

A *public* JavaScript package for tracking and suppressing duplicate invocations of [AWS Lambda Functions](https://aws.amazon.com/lambda/).

### Workflow

* Each Lambda invocation includes an ```event``` object.
* Depending on the ```event``` source, a unique identifier can usually be extracted.
* The [```DynamoMessageValidator```](./lib/dynamo/DynamoMessageValidator.js) saves these unique identifiers to DynamoDB (using a conditional writes).
* Failure indicates another Lambda has already processed the same event and processing should be suppressed.

### Usage

This package is typically used with a simple framework found in the [@barchart/common-node-js](https://github.com/barchart/common-node-js) library.

* First, instantiate a [```LambdaEventValidator```](https://github.com/barchart/common-node-js/blob/master/aws/lambda/validators/LambdaEventValidator.js) and add a [```DynamoMessageValidator```](./lib/dynamo/DynamoMessageValidator.js) instance.
* Then, plug the [```LambdaEventValidator```](https://github.com/barchart/common-node-js/blob/master/aws/lambda/validators/LambdaEventValidator.js) into your [```LambdaHelper```](https://github.com/barchart/common-node-js/blob/master/aws/lambda/LambdaHelper.js) by overriding its ```getValidator``` function.

### License

This software is provided under the MIT license.