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__tests__ test: quiet test outputs Jun 20, 2019
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README.md

lambda-powertools-middleware-stop-infinite-loop

A Middy middleware that will stop an invocation if it's deemed to be part of an infinite loop.

Main features:

  • errors if the call-chain-length reaches the configured threshold (defaults to 10)

Getting Started

Install from NPM: npm install @perform/lambda-powertools-middleware-stop-infinite-loop

API

The middleware accepts an optional constructor parameter threshold, which is the max length allowed for the entire call chain.

This middleware is intended to be used alongside @perform/lambda-powertools-middleware-correlation-ids, which is responsible for collecting correlation IDs and incrementing the call-chain-length (i.e. the number of function invocations that are chained together) at the start of an invocation.

Because this middleware relies on @perform/lambda-powertools-middleware-correlation-ids, it needs to be applied AFTER @perform/lambda-powertools-middleware-correlation-ids (as seen below).

const middy = require('middy')
const correlationIds = require('@perform/lambda-powertools-middleware-correlation-ids')
const stopInfiniteLoop = require('@perform/lambda-powertools-middleware-stop-infinite-loop')

const handler = async (event, context) => {
  return 42
}

module.exports = middy(handler)
  .use(correlationIds())
  .use(stopInfiniteLoop()) // defaults to 10
}
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