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Developing Ordering Microservice Consume CheckoutBasket Event

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

answer Developing Ordering Microservice Consume CheckoutBasket Event

Developing Ordering Microservice Consume CheckoutBasket Event

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And we have several use cases across microservices like that: a customer create orders with some products and, if the payment is successful,

the products should be delivered to the customer. So the we can perform the whole process with events and events is more understandable for customers also. These could be flow of events like;

a customer creates an order

the customer receives a payment request

if the payment is successful the stock is updated and the order is delivered

if the payment in not successful, rollback the order and set order status is not completed.

This is more humanly readable and, if a new business requirement appears, it is easier to change the flow.

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: typescript

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Contributed on Feb 13 2023

Pragya Keshap

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Developing Ordering Microservice Consume CheckoutBasket Event

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