Scheduled-on-deletions-insert.js

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

const dynamodb = new aws.DynamoDB.DocumentClient();

const uuid = require('uuid/v4');

const addToDynamoDb = async ({ butterflyName, bornTime }) => {
  const butterflyId = uuid();
  const nowTimestamp = new Date().getTime(); // Date when a butterfly is born as an egg
  const becomesCaterpilarAt = nowTimestamp + 7 * 24 * 60 * 60 * 1000; // Time when an egg becomes a caterpilar (update terminology in the blog)
  const becomesCocoonAt = becomesCaterpilarAt + 7 * 24 * 60 * 60 * 1000; // Time when a caterpilar becomes a cocoon
  const becomesButterflyAt = becomesCocoonAt + 7 * 24 * 60 * 60 * 1000; // Time when a cocoon becomes a butterfly
  const butterflyTableName = 'Butterfly';
  await dynamodb.transactWrite({
    TransactItems: [
      {
        // Scheduling transition into a caterpilar
        Put: {
          TableName: butterflyTableName,
          Item: {
            partitionId: butterflyId,
            id: becomesCaterpilarAt,
            status: 'CATERPILAR',
            recordType: 'STATUS_TASK',
            ttl: becomesCaterpilarAt,
          }
        },
      },
      {
        // Scheduling transition into a cocoon
        Put: {
          TableName: butterflyTableName, // TODO : Make a const for the table name
          Item: {
            partitionId: butterflyId,
            id: becomesCocoonAt,
            status: 'COCOON',
            recordType: 'STATUS_TASK',
            ttl: becomesCocoonAt,
          }
        },
      },
      {
        // Scheduling transition into a buttterfly
        Put: {
          TableName: butterflyTableName,
          Item: {
            partitionId: butterflyId,
            id: becomesButterflyAt,
            status: 'BUTTERFLY',
            recordType: 'STATUS_TASK',
            ttl: becomesButterflyAt,
          }
        },
      },
      {
        // Adding a new butterfly in the "egg" state
        Put: {
          TableName: butterflyTableName,
          Item: {
            partitionId: butterflyId,
            id: butterflyId,
            name: butterflyName,
            status: 'EGG',
            recordType: 'BUTTERFLY',
          }
        },
      }
    ],
  }).promise();
};