LambdaToDynamoDBGet

// create an IAM Lambda role with access to dynamodb
// Launch Lambda in the same region as your dynamodb region
// (here: us-east-1)
// dynamodb table with hash key = dsn, uniqueid (hashkey for GSI), data (String/Blob)

console.log('Loading function');
const AWS = require('aws-sdk');
const dynamodb = new AWS.DynamoDB();

exports.handler = function(event, context) {
    console.log(JSON.stringify(event, null, '  '));
    dynamodb.listTables(function(err, data) {
      console.log(JSON.stringify(data, null, '  '));
    });
    var tableName = "dsncustomer";
    var datetime = new Date().getTime().toString();
    dynamodb.getItem({
        "TableName": tableName,
        "Key" : {
            "dsn": { "S": event.serialNumber }
        }
    }, function(err, data) {
        if (err) {
            context.done('error getting item into dynamodb failed: '+err);
        }
        else {
            console.log('great success: '+JSON.stringify(data.Item.uniqueid.S, null, '  '));
            context.done(null, JSON.stringify(data.Item.uniqueid.S));
        }
    });
};