A public JavaScript package for tracking and suppressing duplicate invocations of AWS Lambda Functions.

• Each Lambda invocation includes an event object.
• Depending on the event source, a unique identifier can usually be extracted.
• The DynamoMessageValidator 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.

This package is typically used with a simple framework found in the @barchart/common-node-js library.

• First, instantiate a LambdaEventValidator and add a DynamoMessageValidator instance.
• Then, plug the LambdaEventValidator into your LambdaHelper by overriding its getValidator function.

This software is provided under the MIT license.