Writing data to Dynamodb from Serverless

index.js

'use strict';

const doc = require('dynamodb-doc');
const dynamo = new doc.DynamoDB();
const Q = require('kew');

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

  function putItem() {
    const defer = Q.defer();
    const query = event.queryStringParameters;
    const params = {
      TableName: 'test',
      Item: {
        customerId: query.customerId,
        durationInHours: parseInt(query.durationInHours),
      }
    };

    dynamo.putItem(params, defer.makeNodeResolver());
    return defer.promise;
  }

  function response(data, statusCode) {
    const response = {
      statusCode: statusCode,
      body: JSON.stringify({
        data: data,
        input: event,
      }),
    };

    callback(null, response);
  }

  putItem()
    .then(data => response(data, 200))
    .fail(err => response(err, 500));
};

query_string.txt

customerId=abc&durationInHours=447

serverless.yml

service: aws-nodejs

provider:
  name: aws
  runtime: nodejs4.3
  stage: dev
  region: ap-southeast-2
  iamRoleStatements:
    - Effect: "Allow"
      Action:
        - dynamodb:GetItem
        - dynamodb:BatchGetItem
        - dynamodb:Query
        - dynamodb:PutItem
        - dynamodb:UpdateItem
        - dynamodb:DeleteItem
        - dynamodb:BatchWriteItem
      Resource: "arn:aws:dynamodb:ap-southeast-2:*:*"

functions:
  hello:
    handler: index.handler
    events:
      - http:
          path: index
          method: post