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fake-survey-generator

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A slightly more-than-trivial full-stack application built with DDD & CQRS concepts

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<div align="center">
  <small align="center">Logo by <a href="https://undraw.co">Undraw</a></small>
</div>

<h1 align="center">
  Fake Survey Generator
</h1>

<p align="center">
This is an app. That generates surveys. Fake ones. For fun. That is all.
</p>

[![Build Status](https://dev.azure.com/marcelmichau/Personal/_apis/build/status/fake-survey-generator/fake-survey-generator?branchName=main)](https://dev.azure.com/marcelmichau/Personal/_build/latest?definitionId=26&branchName=main)

[Open in github.dev](https://github.dev/MarcelMichau/fake-survey-generator)

## Screenshot

![Screenshot](https://raw.githubusercontent.com/MarcelMichau/fake-survey-generator/main/images/screenshot.png "Screenshot of Fake Survey Generator UI")

## What is this?

This is a .NET | C# | React | TypeScript full-stack application of moderate complexity (not just a to-do app), used as a
playground for experimentation. Simply put: This is where I mess around with code. It is heavily inspired by
the [.NET Microservices: Architecture for Containerized .NET Applications](https://docs.microsoft.com/en-us/dotnet/architecture/microservices/)
book, as well as its companion reference
application [eShopOnAzure](https://github.com/Azure-Samples/eShopOnAzure). It also incorporates various
elements from different repos & blog posts which served as inspiration.

It is built using Vertical Slice Architecture principles with CQRS (Command Query Responsibility Segregation) and DDD (Domain-Driven Design) thrown into the mix. It doesn't follow these principles to the letter, but provides a decent
example of how to apply the basics of these principles.

It is heavily centered around the
Microsoft [.NET](https://dotnet.microsoft.com/) + [Azure](https://azure.microsoft.com/) technology stacks as these are
what I have the most experience in & just like building things with. 😀

Here are some of the features incorporated into this project:

### Application Features

- Observable, production ready, distributed application support
  using [Aspire](https://aspire.dev/)
- Unit & Integration tests for a CQRS/DDD project with [TUnit](https://tunit.dev)
- Target production database for integration tests
  using [Testcontainers for .NET](https://github.com/testcontainers/testcontainers-dotnet)
- E2E acceptance tests
  using [Aspire Test Projects](https://aspire.dev/testing/overview/) & [Playwright for .NET](https://playwright.dev/dotnet/)
- Implementing health checks for various components
  using [AspNetCore.Diagnostics.HealthChecks](https://github.com/Xabaril/AspNetCore.Diagnostics.HealthChecks)
- Adding [OpenAPI](https://learn.microsoft.com/en-us/aspnet/core/fundamentals/openapi/overview) to an ASP.NET Core Web API
  with [Scalar](https://github.com/scalar/scalar) for API documentation
- Adding [OpenID Connect](https://openid.net/connect/) for Authentication
- Adding OpenID Connect to Scalar
- Securing an ASP.NET Core Web API using JWT Bearer authentication
- Adding security headers to API responses
  using [NetEscapades.AspNetCore.SecurityHeaders](https://github.com/andrewlock/NetEscapades.AspNetCore.SecurityHeaders)
- Using [Hosted Services](https://docs.microsoft.com/en-us/aspnet/core/fundamentals/host/hosted-services) in ASP.NET
  Core Web API
- Using a distributed [Redis](https://redis.io/) cache
- Using [Microsoft.Extensions.Http.Resilience](https://learn.microsoft.com/en-us/dotnet/api/microsoft.extensions.http.resilience) for resilient HTTP requests
- Implementing [Forwarded Headers](https://docs.microsoft.com/en-us/aspnet/core/host-and-deploy/proxy-load-balancer) for hosting ASP.NET Core Web API behind a load balancer
- Validation of commands using [FluentValidation](https://fluentvalidation.net/)
- Configuring [Azure Monitor OpenTelemetry](https://learn.microsoft.com/en-us/azure/azure-monitor/app/opentelemetry-enable) for telemetry
- Using [Dapr](https://dapr.io/) with [Dapr SDK for .NET](https://github.com/dapr/dotnet-sdk) for platform agnostic
  integration with infrastructure components

### Infrastructure Features

- Automatic semantic versioning using [Nerdbank.GitVersioning](https://github.com/dotnet/Nerdbank.GitVersioning)
- Creating trusted SSL certificates for HTTPS in development
- Deploying Entity Framework Core Code-First Migrations
  to [Azure SQL Database](https://azure.microsoft.com/en-us/services/sql-database/)
  using [Azure Pipelines](https://docs.microsoft.com/en-us/azure/devops/pipelines/get-started/what-is-azure-pipelines?view=azure-devops)
- Using [Microsoft Entra ID](https://www.microsoft.com/en-us/security/business/identity-access/microsoft-entra-id)
  authentication to [Azure SQL Database](https://azure.microsoft.com/en-us/services/sql-database/) with Entity Framework
  Core
- Running a distributed application locally using [Aspire](https://aspire.dev/get-started/what-is-aspire/)
- Using Azure Pipelines
  with [Azure Developer CLI](https://learn.microsoft.com/en-us/azure/developer/azure-developer-cli/overview) to build &
  deploy a distributed application
  to [Azure Container Apps](https://azure.microsoft.com/en-us/services/container-apps/#overview)
- Infrastructure as Code for Azure resources
  using [Bicep](https://docs.microsoft.com/en-us/azure/azure-resource-manager/bicep/overview)

Some of the above features are relatively straightforward to implement, others have some intricacies that require some
Googling in order to set up. I just like to have them placed in the context of a complete working application to refer
back to when necessary.

## Why is this here?

I wanted something to try new things out on, without the risk of substantially endangering an actual production
environment used by actual people.

It was for this reason that I built the Fake Survey Generator (FSG) app as a way to test out tools, libraries, patterns,
frameworks & various other stuff.

It has a very simple domain: it generates surveys. Fake ones. They can be used as a tool for helping you decide what to
have for dinner, which book you should read next, where you should go for your next team lunch, or anything that tickles
your fancy.

This application is also used as a reference for configuring/wiring up some common things I sometimes forget how to do.
_Living Documentation_ if you will. You know the culprits: How do I wire up that database again? What is the syntax for
that logging configuration? How do I make thing A talk to thing B?

The domain is kept relatively simple such that it doesn't overwhelm the app with unnecessary complexity. It should be
quite easy to wrap your head around without requiring a degree in Computer Science.

I also felt that a lot of reference/demo/boilerplate projects out there cover the core application domain & don't go
into much detail around the building/deployment/hosting of final application. So this project aims to cover both. It
contains application code, configuration, CI/CD pipelines, infrastructure-as-code needed to run the application, as well
as a live, running version of the application (as long as budget allows 😁). So this repo hopefully may contain something
for everyone & fill in the potential gaps across the whole spectrum of application development. It falls somewhere
between a template/boilerplate project & a real-world production open-source application.

## How is this thing structured?

FSG consists of two parts:

### Server

The server side consists of the following main components:

- Fake Survey Generator API
- Fake Survey Generator Worker
- Application Project
- Application Tests Project
- API Integration Tests Project
- E2E Acceptance Tests Project

The server side makes use of the following tools, libraries & frameworks:

- Fake Survey Generator API
    - .NET 10
    - [ASP.NET Core](https://docs.microsoft.com/en-gb/aspnet/core) Web API
    - [Aspire](https://aspire.dev/get-started/what-is-aspire/)
    - [Entity Framework Core](https://docs.microsoft.com/en-us/ef/core/)
      with [Code-First Migrations](https://docs.microsoft.com/en-us/ef/core/managing-schemas/migrations/?tabs=dotnet-core-cli)
    - [Dapper](https://github.com/StackExchange/Dapper)
    - [Redis](https://redis.io/)
    - [Scalar](https://scalar.com/)
    - [FluentValidation](https://fluentvalidation.net/)
    - [AspNetCore.Diagnostics.HealthChecks](https://github.com/Xabaril/AspNetCore.Diagnostics.HealthChecks)
    - [Docker](https://www.docker.com/)
    - [NSubstitute](https://nsubstitute.github.io/)
- Fake Survey Generator Worker
    - .NET 10
    - ASP.NET Core Worker Service

### Client

The client side consists of the following main components:

- UI

The client side makes use of the following tools, libraries & frameworks:

- [Vite](https://vitejs.dev/)
- [React](https://reactjs.org/)
- [TypeScript](https://www.typescriptlang.org/)
- [auth0.js](https://github.com/auth0/auth0.js/)
- [Tailwind CSS](https://tailwindcss.com/)
- [PostCSS](https://postcss.org/)
- [React Loading Skeleton](https://github.com/dvtng/react-loading-skeleton)
- [Docker](https://www.docker.com/)

### Common

The application is built for containers & Aspire. For local development, the Aspire App host is used when debugging the
application with Visual Studio/Rider.

The hosted version of the application is deployed here: https://fakesurveygenerator.mysecondarydomain.com

The following endpoints are accessible:

- [/openapi](https://fakesurveygenerator.mysecondarydomain.com/api-docs) - The OpenAPI documentation page for
  the API
- [/health/live](https://fakesurveygenerator.mysecondarydomain.com/health/live) - Health Checks endpoint used by Azure
  Front Door health probe
- [/health/ready](https://fakesurveygenerator.mysecondarydomain.com/health/ready) - Health Checks endpoint used by Azure
  Front Door health probe

The hosted version utilizes the following infrastructure:

- [Azure Container Apps](https://azure.microsoft.com/en-us/services/container-apps/#overview)
- [Azure SQL Database](https://azure.microsoft.com/en-us/services/sql-database/)
- [Azure Cache for Redis](https://azure.microsoft.com/en-us/services/cache/)
- [Azure Container Registry](https://azure.microsoft.com/en-us/services/container-registry/)
- [Azure Key Vault](https://azure.microsoft.com/en-us/services/key-vault/)
- [Azure Log Analytics](https://docs.microsoft.com/en-us/azure/azure-monitor/logs/log-analytics-overview)
- [Azure Application Insights](https://docs.microsoft.com/en-us/azure/azure-monitor/app/app-insights-overview)
- [Azure Front Door](https://azure.microsoft.com/en-in/pricing/details/frontdoor/#overview)
- [Azure DNS](https://docs.microsoft.com/en-us/azure/dns/dns-overview)
- [Azure DevOps](https://azure.microsoft.com/en-us/services/devops/) (for CI/CD)

## Authentication

The application makes use of [OpenID Connect](https://openid.net/connect/) for authentication which is implemented
by [Auth0](https://auth0.com/). Currently supported connections are:

- Auth0
- Google

## How do I run this thing?

In order to run FSG on your local machine, you will need the following prerequisites:

- [Docker](https://www.docker.com/products/docker-desktop) or [Podman](https://podman.io/)
- [Dapr CLI](https://docs.dapr.io/getting-started/install-dapr-cli/)
- [Visual Studio 2022 v17.10 or higher](https://visualstudio.microsoft.com/vs/)

1. Open `FakeSurveyGenerator.slnx` in Visual Studio:

2. Ensure that the `FakeSurveyGenerator.AppHost` project is selected as the startup project

3. Hit `F5` to debug the application, or `Ctrl` + `F5` to run without debugging

4. The [Aspire Dashboard](https://aspire.dev/dashboard/overview/) should
   open automatically

## How do I contribute?

If you find a bug, want to add a feature, or want to improve the documentation, open up a PR!

## References

My deepest thanks to all the people who provided these resources as reference:

- [.NET Microservices: Architecture for Containerized .NET Applications](https://docs.microsoft.com/en-us/dotnet/architecture/microservices/)
- [eShopOnContainers](https://github.com/dotnet-architecture/eShopOnContainers)
- [jasontaylordev/CleanArchitecture](https://github.com/jasontaylordev/CleanArchitecture)
- [nadirbad/VerticalSliceArchitecture](https://github.com/nadirbad/VerticalSliceArchitecture)
- [Vladimir Khorikov - Applying Functional Principles in C#](https://pluralsight.com/courses/csharp-applying-functional-principles)
- [Vladimir Khorikov - Functional C#: Primitive obsession](https://enterprisecraftsmanship.com/posts/functional-c-primitive-obsession/)

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