AWS DynamoDB Streams

Hello,

I have a table named contactDetails that basically stores phonenumber for each contact. I have also enabled streams and have created a trigger using an lambda function to send an email whenever a new record is created in the table.

I do receive an email but I get them twice. It looks like there are more than one time the same record is modified for different attributes so it generates different stream events.

Lamdbafunction.txt
'use strict';
var AWS = require("aws-sdk");
var sns = new AWS.SNS();

exports.handler = (event, context, callback) => {

   event.Records.forEach((record) => {
     console.log('Stream record: ', JSON.stringify(record, null, 2));
  // console.log(event);
       
        if (record.eventName == 'MODIFY') {
           
           // console.log(event);
         
             let tabledetails = JSON.parse(JSON.stringify(event.Records[0].dynamodb));
            //    console.log(tabledetails.NewImage.address.S);
                let customerPhoneNumber = tabledetails.NewImage.customerPhoneNumber.S;
                   
             
           var params = {
                Subject: 'A new voicemail received from' + customerPhoneNumber,
                Message: 'A new voicemail received from Phone Number ' + customerPhoneNumber,
                TopicArn: 'arn:aws:sns:xxxxxx:xxxxxxx:xxxxxxxsnstopic'
        };
           
            }
                   
          sns.publish(params, function(err, data) {
                if (err) {
                    console.error("Unable to send message. Error JSON:", JSON.stringify(err, null, 2));
                } else {
                    console.log("Results from sending message: ", JSON.stringify(data, null, 2));
                }
            });
           });
 
    callback(null, `Successfully processed ${event.Records.length} records.`);
};  


What I need is even though there are multiple events generated for the same record, I only need one email to be send out based on the primary key(contactID) in the table.

Attached is the sample lambda function.