SAM Application

create.js

'use strict';

const AWS = require('aws-sdk');

module.exports.create = (event, context, callback) => {
  const timestamp = new Date().getTime();
  const data = JSON.parse(event.body);
  var params = {
    TableName: "customerTable",
    Item: {
     "customer_id": data.customer_id,
     "created_timestamp": timestamp
    }
  };
  var dynamodbDocClient = new AWS.DynamoDB.DocumentClient();
  dynamodbDocClient.put(params, function(err, data) {
    if (err) callback(Error(err))
    else callback(null, {statusCode: 200, body: JSON.stringify(params)});  
  });
}

package.json

{
    "name": "sam-app",
    "version": "1.0.0",
    "description": "Sam App",
    "main": "create.js",
    "license": "MIT"
  }
  

template.yml

AWSTemplateFormatVersion: '2010-09-09'
Transform: 'AWS::Serverless-2016-10-31'
Description: A microservice using AWS SAM, API Gateway, Lambda, and DynamoDB
Resources:
  newCustomer:
    Type: 'AWS::Serverless::Function'
    Properties:
      Handler: create.create
      Runtime: nodejs8.10
      CodeUri: .
      Description: Used to create a new customer in the database
      MemorySize: 512
      Timeout: 10
      Policies:
        - Version: '2012-10-17'
          Statement:
            - Effect: Allow
              Action:
                - 'dynamodb:PutItem'
              Resource:
                'Fn::Join':
                  - ''
                  - - 'arn:aws:dynamodb:'
                    - Ref: 'AWS::Region'
                    - ':'
                    - Ref: 'AWS::AccountId'
                    - ':table/customerTable'
      Events:
        Api1:
          Type: Api
          Properties:
            Path: /create
            Method: POST
  customerTable:
    Type: 'AWS::DynamoDB::Table'
    Properties:
      TableName: customerTable
      AttributeDefinitions:
        - AttributeName: customer_id
          AttributeType: S
      KeySchema:
        - AttributeName: customer_id
          KeyType: HASH
      ProvisionedThroughput:
        ReadCapacityUnits: 1
        WriteCapacityUnits: 1