elasticcloud-dynamodb-stream's Introduction

    Basically a fork of https://github.com/matrus2/dynamodb-stream-elasticsearch

Works only with the standard Elasticsearch >= 7.2

DynamoDB --> Stream --> ElasticSearch

The missing blueprint for AWS Lambda, which reads stream from AWS DynamoDB and writes it to ElasticSearch. Compatible with node 10.x.

Whenever data is changed (modified, removed or inserted) in DynamoDB one can use AWS Lambda function to capture this change and update ElasticSearch machine immediately. Further reading:

Getting Started

Install:

npm install --save elasticcloud-dynamodb-stream

Use it in your lambda:

const {pushStream} = require("elasticcloud-dynamodb-stream")

const trans = async (obj) => {
    // do stuff with obj
    return obj
}

const ES_ARGS = {
  index: process.env.INDEX, 
  host: process.env.ES_ENDPOINT,
  transformFunction: trans, // OPTIONAL
  refresh: false
}

module.exports.toElastic = async (event, context) => {
    try {
      await pushStream({ event,  ...ES_ARGS})
    } catch(e) {
      console.log(e)
      throw e
    }
    return  `Successfully processed ${event.Records.length} records.`
}

Parameters

Param	Description	Required
event	Event object generated by the stream (pass it as it is and don't modify)	required
endpoint	Exact url of ElasticSearch instance (it works only with standard ES) (string)	required
index	The name of ElasticSearch index (string). If not provided will set the same as DynamoDB table name	optional
refresh	Force ElasticSearch refresh its index immediately more here (boolean). Default: true	optional
transformFunction	A function/promise to transform each record before sending them to ES. Applies to INSERT and UPDATE operations	optional
options	Additional set of arguments passed to elasticsearch Client see here	optional