# @barchart/aws-lambda-suppressor

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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.


Utilities for tracking and suppressing AWS Lambda invocations. 

@barchart/aws-lambda-suppressor

Utilities for tracking and suppressing AWS Lambda invocations

bryan.ingle

borja.yanes

mark.kerman

igor-losev

l-zhang

eapikat

ddotlic

ravish.brahmbhatt

avasilevich

ebarchukov

alena.labada

swiderberg

jmbaker

tomsisk

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@barchart/aws-lambda-suppressor

@barchart/aws-lambda-suppressor

Workflow

Usage

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