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order-processing-system

A set of microservices designed to implement the order and payment processing system.

Getting Started

These instructions will get you a working API that you can interact with.

Prerequisites

What things you need to run the system and how to install them

Starting the services

To launch the set of services, just run the following:

docker-compose up

If you want to run the services in the background then add the -d flag

docker-compose up -d

In order to rebuild the services add the --build flag at the end

docker-compose up --build

or

docker-compose build

Access the API

To access the API you can send out curl requests to http://localhost:8000/api or better, open Insomnia Rest Client and import the collection provided insomnia_collection.json to view the complete set of routes with sample body provided.

Architecture

The overall architecture includes two node.js applications, a messaging broker, a gateway and a database service. The entire application is brought up with docker-compose as a proof of concept which can be replaced with a simple kubernetes cluster.

Here is a diagramatic overview of the system:

Authentication

Authentication middleware has been placed as a dummy that always returns appends a user's details in the request object. A string/token has been hardcoded to protect all routes that needs to be passed in the request authorization header. This mocks an already signed in user behavior where a signed in session will automatically be sending a JWT token for example, in the authorization header.

To make the application work please add this hardcoded token in the request header:

Authorization: thisisajwttoken

Orders API

A user is allowed to create an order, cancel an order, get a specific order or get all their orders.

Routes

  • GET /api/orders - gets all the orders for the user
  • POST /api/orders - creates an order against the user
  • GET /api/orders/{id} - gets a specific order for the user
  • DELETE /api/orders/{id} - cancels a specific order for the user

Sample body for order creation:

{
	"bill": 2000
}

The provided Insomnia collection has all the routes provided with prefilled request body, headers etc.

Events Pushed to Messaging Broker

  • payment-create-event - pushed to the broker whenever an order is created so that a corresponding payment object is created

Events Received from Messaging Broker

  • payment-processed-event - received whenever a payment is processed. Can be a denied payment or an accepted payment. Based on the status the appropriate event handler is invoked

Cron Job

  • Whenever an order is confirmed, a timer is added to the callback queue to process the order and change the status to delivered after a hardcoded time.

Payments API

A user can get a specific payment using the order ID or can get all their payments as well as initiate a payment for a specific order.

  • GET /api/payments - gets all the payments for the user
  • GET /api/payments/{orderId} - gets a specific payment against an order for the user
  • POST /api/payments/pay/{orderId} - initiates a payment against an order for the user.

A sample body for the last route is provided as below:

{
	"creditCardDetails": {
		"number": "10298310928301",
		"cvt": 345,
		"expiry": "4/12/2020"
	}
}

The provided Insomnia collection has all the routes provided with prefilled request body, headers etc.

Events Pushed to Messaging Broker

  • payment-processed-event - pushed whenever a payment is processed. Can be a denied payment or an accepted payment.

Events Received from Messaging Broker

  • payment-create-event - received whenever an order is created so that a corresponding payment object is created

Testing

In order to run the unit tests, go to either of the apps folders orders-api/ or payments-api/ and run the command:

npm run test

Built With

  • Express - Fast, unopinionated, minimalist web framework for Node.js

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