serverless-framework-app

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: process.env.TABLE_NAME,
    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)});  
  });
}

serverless.yml

org: fernando  # Replace this with your organization
app: customers-demo-sam
service: api

frameworkVersion: '>=1.50.0 <2.0.0'

provider:
  name: aws
  runtime: nodejs8.10
  memorySize: 512
  timeout: 10
  environment:
    TABLE_NAME: customerTable-${opt:stage, 'dev'}
  iamRoleStatements:
    - Effect: Allow
      Action:
        - dynamodb:PutItem
      Resource: "arn:aws:dynamodb:us-east-1:*:table/customerTable-${opt:stage, 'dev'}"

functions:
  newCustomer:
    handler: create.create
    memorySize: 512
    timeout: 10 
    events:
      - http:
          path: /create
          method: post
resources:
  Resources:
    customerTable:
      Type: 'AWS::DynamoDB::Table'
      Properties:
        TableName: customerTable-${opt:stage, 'dev'}
        AttributeDefinitions:
          - AttributeName: customer_id
            AttributeType: S
        KeySchema:
          - AttributeName: customer_id
            KeyType: HASH
        ProvisionedThroughput:
          ReadCapacityUnits: 1
          WriteCapacityUnits: 1