May 25, 2024


Voiced by Polly

At the moment, I’m glad to announce that a new open-source pattern utility, a fictitious used books eCommerce retailer we name Bob’s Used Books, is obtainable for .NET builders working with AWS. The .NET advocacy and improvement groups at AWS discuss to clients recurrently and, throughout these conversations, typically obtain requests for extra in-depth samples. Prospects inform us that, whereas small code snippets serve effectively for instance the mechanics of an API, their improvement groups additionally want and wish to make use of fuller, extra real-world samples to know higher the best way to assemble fashionable functions for the cloud. At the moment’s pattern utility launch is in response to these requests.

Bob’s Used Books is a pattern eCommerce utility constructed utilizing ASP.NET Core model 6 and represents an preliminary modernization of a typical on-premises customized utility. Representing a primary stage of modernization, the appliance makes use of fashionable cross-platform .NET, enabling it to run on each Home windows and Linux programs within the cloud. It’s typical of what many .NET builders are simply now going by way of, porting their very own functions from .NET Framework to .NET utilizing freely accessible instruments from AWS such because the Toolkit for .NET Refactoring and the Porting Assistant for .NET.

Bob's Used Books sample application homepage

Pattern utility options
Prospects of our fictional bookstore can browse and search on the shop for used books and look at particulars on chosen books similar to value, situation, style, and extra:

Bob's Used Books sample application search results page, which shows 8 books and their prices.


Bob's Used Books sample application book details page

Similar to an actual e-commerce retailer, clients can add books to a buying cart, pending subsequent checkout, or to a private want record. When the time involves buy, the client can begin the checkout course of, which can encourage them to sign up if they’re an current buyer or join throughout the course of.

Bob's Used Books sample application checkout page

On this pattern utility, the bookstore’s employees makes use of the identical net utility to handle stock and buyer orders. Position-based authentication is used to find out whether or not it’s a employees member signing in, by which case they will view an administrative portal, or a daily retailer buyer. For workers, having accessed the admin portal, they begin with a dashboard view that summarizes pending, in-process, or accomplished orders and the state of the shop’s stock:

Bob's Used Books sample application staff dashboard page

Employees can edit stock so as to add new books, full with cowl photos, or modify inventory ranges. From the identical dashboard, employees may also view and course of pending orders.

Bob's Used Books sample application staff order processing page

Not proven right here, however one thing I believe is fairly cool, is a simulated workflow the place clients can re-sell their books by way of the shop. This entails the client submitting an utility, the shop admin evaluating and deciding whether or not to buy from the client, the client “posting” the e book to the shop if accepted, and at last the admin including the e book into stock and reimbursing the client. Keep in mind, that is all fictional, nevertheless—no precise monetary transactions happen!

Utility structure
The bookstore pattern didn’t begin as a .NET Framework-based utility that wanted porting to .NET, however it does use a monolithic MVC (model-view-controller) utility design, typical of the .NET Framework improvement period (and nonetheless in use at present). It additionally makes use of a single Microsoft SQL Server database to include stock, buying cart, person knowledge, and extra.

Bob's Used Books sample application outline architecture

When totally deployed to AWS, the appliance makes use of a number of providers. These present assets to host the appliance, present configuration to the working utility, and likewise present helpful performance to the working code, similar to picture verification:

  • Amazon Cognito – used for buyer and bookstore employees authentication. The applying makes use of Cognito‘s Hosted UI to supply sign-in and sign-up performance.
  • Amazon Relational Database Service (RDS) – manages a single Microsoft SQL Server Categorical occasion containing stock, buyer, and different typical knowledge for an e-commerce utility.
  • Amazon Easy Storage Service (Amazon S3) – an S3 bucket is used to retailer cowl photos for books.
  • AWS Techniques Supervisor Parameter Retailer – accommodates runtime configuration knowledge, together with the title of the S3 bucket for canopy photos, and Cognito person pool particulars.
  • AWS Secrets and techniques Supervisor – holds the person and password particulars for the underlying SQL Server database in RDS.
  • Amazon CloudFront – supplies a website for accessing the duvet photos within the S3 bucket, which suggests the bucket doesn’t must be publicly accessible.
  • Amazon Rekognition – used to confirm that cowl photos uploaded for a e book don’t include objectionable content material.

The applying is a place to begin to showcase additional modernization alternatives sooner or later, similar to adopting purpose-built databases as a substitute of utilizing a single relational database, decomposing the monolith to make use of microservices (for the latter, AWS supplies the Microservice Extractor for .NET), and extra. The .NET improvement, advocacy, and resolution architect groups right here at AWS are fairly excited on the alternatives for brand new content material, utilizing this pattern, for instance these modernization alternatives within the upcoming months. And, because the pattern is open-source, we’re additionally to see the place the .NET improvement group takes it relating to modernization.

Working the appliance
My colleague Brad Webber, a Options Architect at AWS, has written the primary in a sequence of technical weblog posts we’ll be publishing in regards to the pattern. You’ll discover these on the brand new .NET on AWS weblog channel. In his first publish, you’ll be taught extra about the best way to run or debug the appliance by yourself machine in addition to deploy it fully to the AWS cloud.

The applying makes use of SQL Server Categorical localdb occasion for its database wants when working outdoors the cloud, which suggests you do at the moment must be utilizing a Home windows machine to run or debug. Launch profiles, accessible from Visible Studio, Visible Studio Code, or JetBrains Rider (all on Home windows), are used to pick out how the appliance runs (for instance, with no or some cloud assets):

  • Native – When you choose this launch profile, the appliance runs fully in your machine, utilizing no cloud assets, and doesn’t want an AWS account. This lets you examine and experiment with the code incurring no costs for cloud assets.
  • Built-in – If you use this profile, the appliance nonetheless runs regionally in your Home windows machine and continues to make use of the localdb database occasion, however now additionally makes use of some AWS assets, similar to an S3 bucket, Rekognition, Cognito, and others. This profile lets you find out how you should use AWS providers inside your utility code, utilizing the AWS SDK for .NET and varied extension libraries that we distribute on NuGet (for a full record of all accessible libraries you should use when growing your functions, see the .NET on AWS repository on GitHub). To allow you to arrange the cloud assets wanted by the appliance when utilizing this profile, an AWS Cloud Improvement Package (AWS CDK) challenge is supplied within the pattern repository, making it simple to arrange and tear down these assets on demand.

Deploying the Pattern to AWS
You can even deploy your complete utility to the AWS Cloud, on this case, to digital machines in Amazon Elastic Compute Cloud (Amazon EC2) with a SQL Server Categorical database occasion in Amazon Relational Database Service (RDS). The deployment makes use of assets suitable with the AWS Free Tier however do notice, nevertheless, that you could be nonetheless incur costs in case you exceed the Free Tier limits. In contrast to working the appliance by yourself machine, which requires Home windows due to the localdb dependency, you’ll be able to deploy the appliance to AWS from any machine, together with these working macOS and Linux. As soon as once more, a CDK challenge is included within the repository to get you began, and Brad’s weblog publish goes into extra element on these steps so I gained’t repeat them right here.

Utilizing digital machines within the cloud is commonly a primary step in modernizing on-premises functions due to similarity with an on-premises server setup, therefore the explanation for supporting Amazon EC2 deployments out-of-the-box. Sooner or later, we’ll be including content material displaying the best way to deploy the appliance to container providers on AWS, similar to AWS App Runner, Amazon Elastic Container Service (Amazon ECS), and Amazon Elastic Kubernetes Service (EKS).

Subsequent steps
The Bob’s Used Books pattern utility is obtainable now on GitHub. We encourage you, in case you’re a .NET developer engaged on AWS and searching for a deeper, extra real-world pattern, to clone the repository and take the appliance for a spin. We’re additionally interested by what modernization journeys you’ll determine to take with the appliance, which can assist us create future content material for the pattern. Tell us within the points part of the repository. And if you wish to contribute to the pattern, we welcome contributions!


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