Developing Checkout Basket for Send Event to AWS EventBridge

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

answer Developing Checkout Basket for Send Event to AWS EventBridge

Developing Checkout Basket for Send Event to AWS EventBridge

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, we should analysis and design our custom event bus. Basically EventBridge has 3 main core concepts that we need to create;

Custom event bus — CheckoutBasketEventBus

Event Rule with event pattern — we will create CheckoutBasketRule

Targets — we will create SQS order queue and notification ms target for our custom event bus

With this plan, Basket microservice invoke from API gateway with post request, Basket microservice publish checkout basket event to the custom event bus CheckoutBasketEventBus process Event Rule with Event Patterns and publish event to the Target systems.

Create Rule for Custom Event Bus

Event pattern:

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));
// pseo code
 // 1- redirect incoming http request to correct path
 // 2- get request body payload which includes event data
 // 3- publish message to Amazon EventBridge Custom Eventbus with using eventbridge sdk package 
 // 4- return back snyc basket payload to the api gateway 
 
 try {
 
 // 1- redirect incoming http request to correct path 
 if (event.httpMethod != ‘POST’) {
 throw new Error(`Http Method should be POST. You are requesting : “${event.httpMethod}”`);
 }
// 2- get request body payload which includes event data
 // expected request payload : { “item”:”iphone”, “price”:150, “detailtype”:”CheckoutBasket”, “source”: “com.swn.basket.checkoutbasket”
 const basketRequest = JSON.parse(event.body);
 if (basketRequest == null || basketRequest.detailtype == null) {
 throw new Error(`basket detail-type should exist in basketRequest: “${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

Popularity 1/10 Helpfulness 1/10 Language typescript

Source: Grepper

Tags: checkout send typescript

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Contributed on Feb 13 2023

Pragya Keshap

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Developing Checkout Basket for Send Event to AWS EventBridge

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