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Creating AWS EventBridge Eventbus Infrastructure with AWS CDK - Checkout Basket Async Flow

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Pragya Keshap answered on February 13, 2023 Popularity 1/10 Helpfulness 1/10

answer Creating AWS EventBridge Eventbus Infrastructure with AWS CDK - Checkout Basket Async Flow

Creating AWS EventBridge Eventbus Infrastructure with AWS CDK - Checkout Basket Async Flow

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Create Lambda function — Order, Basket, Notification. Give permission according to interactions.

Add Required Permission — Attach Policy — AmazonEventBridgeFullAccess

Basket microservices

EventBridge:PutEvents

Order microservices

SQS:Poll

DynamoDB:Put

Create API Gateway — BasketAPI — POST

Create DynamoDB tables — Order table

Create SQS queues — order-queue

Create Event Source Mapping Polling Invocation — SQS and Lambdas

Create Amazon EventBridge Customer Event Bus — BasketCheckoutEventBus

import { PutEventsCommand } from “@aws-sdk/client-eventbridge”;
import { ebClient } from “./eventBridgeClient.js”;
export const handler = async (event) => {
 console.log(“event:”, JSON.stringify(event, undefined, 2));

 try {
 
 // 1- redirect incoming http request to correct path 
 if (event.httpMethod != ‘POST’) {
 throw new Error(`Http Method should be POST. You are requesting : “${event.httpMethod}”`);
 }
 // expected request payload : { “item”:”iphone”, “price”:150, “detailtype”:”CheckoutBasket”, “source”: “com.swn.basket.checkoutbasket”
 const basketRequest = JSON.parse(event.body);
 if (basketRequest == null || basketRequest.detailtype == null) {
 throw new Error(`basket detail-type should exist in basketRequest: “${basketRequest}”`);
 }
// 3- publish message to Amazon EventBridge Custom Eventbus with using eventbridge sdk package
 const params = {
 Entries: [
 {
 Source: basketRequest.source,
 Detail: JSON.stringify(basketRequest),
 DetailType: basketRequest.detailtype,
 Resources: [ ],
 EventBusName: ‘CheckoutBasketEventBus’
 },
 ],
 };
 
 const data = await ebClient.send(new PutEventsCommand(params));
 console.log(“Success, event sent; requestID:”, data);
 
 // 4- return back snyc basket payload to the api gateway
 return {
 statusCode: 200,
 body: JSON.stringify({
 message: `Successfully finished basket operation: “${basketRequest}”`,
 body: data
 })
 };
} catch (e) {
 console.error(e);
 return {
 statusCode: 500,
 body: JSON.stringify({
 message: “Failed to perform operation.”,
 errorMsg: e.message,
 errorStack: e.stack,
 })
 };
 } 
 
};

https://medium.com/aws-lambda-serverless-developer-guide-with-hands/event-driven-microservice-architecture-using-amazon-eventbridge-sqs-and-lambda-16eb83266b9d

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Source: Grepper

Tags: aws-cdk checkout event-bus flow infrastructure typescript

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Contributed on Feb 13 2023

Pragya Keshap

0 Answers Avg Quality 2/10

Creating AWS EventBridge Eventbus Infrastructure with AWS CDK - Checkout Basket Async Flow

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