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book-fast-service-fabric

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A sample demonstrating how to implement a multitenant facility management and accommodation booking application as native Azure Service Fabric reliable services.

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# Book Fast (Service Fabric)

A sample demonstrating how to implement a multitenant facility management and accommodation booking application as native Azure Service Fabric reliable services.

Here's the introductory blog [post](https://dzimchuk.net/microservices-primer-with-azure-service-fabric/).

> **Note**: An up-to-date containerized version of the sample is available [here](https://github.com/dzimchuk/book-fast-docker).

## Features

### Architecture
- 4 bounded contexts
- CQRS and DDD (with [reliable domain events](https://dzimchuk.net/reliable-domain-events/))
- Stateless and stateful services
- ASP.NET Core 2.x Web API and web frontend

### Service Fabric
- [Per environment configuration](https://dzimchuk.net/configuring-asp-net-core-applications-in-service-fabric/) integrated with ASP.NET Core infrastructure
- [ServicePartitionClient](https://dzimchuk.net/implementing-a-rest-client-for-internal-communication-in-service-fabric/) and Reverse Proxy based [service clients](https://dzimchuk.net/re-iterating-communication-options-in-service-fabric/)
- Application Insights
- EventFlow

### Security
- [Multitenant](https://dzimchuk.net/enabling-multitenant-support-in-you-azure-ad-protected-applications/) Azure AD organizational accounts
- [Azure AD B2C](https://dzimchuk.net/setting-up-your-asp-net-core-2-0-apps-and-services-for-azure-ad-b2c/) authentication for customers
- OpenID Connect and OAuth2

### Azure services
- Azure SQL databases
- Azure Storage
- Azure Service Bus
- Azure Search

### Misc
- [Swagger and AutoRest](https://dzimchuk.net/generating-clients-for-your-apis-with-autorest/)
- Redis cache
- [Circuit Breaker](https://dzimchuk.net/be-prepared-for-downstream-failures-by-implementing-the-circuit-breaker-pattern/)

![BookFast Service Fabric](https://raw.githubusercontent.com/dzimchuk/book-fast-service-fabric/master/BookFastServiceFabric.png)

## Configuration

BookFast.sfproj references `..\..\..\config\BookFast\Local.xml` that is used in local deployment profiles. This file is not included in the repository and you will need to provide your configuration overrides.

Here's a short description of configuration parameters:

```
<?xml version="1.0" encoding="utf-8"?>
<Application xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" Name="fabric:/BookFast" xmlns="http://schemas.microsoft.com/2011/01/fabric">
  <Parameters>
    <Parameter Name="HttpsCertThumbprint" Value="Thumbprint of an SSL certificate installed in the local store" />
    
    <Parameter Name="ASPNETCORE_ENVIRONMENT" Value="Standard APS.NET Core environment setting, e.g. Development" />
    
    <Parameter Name="FacilityServiceUri" Value="http://localhost:19081/BookFast/FacilityService/" />
    <Parameter Name="FilesServiceUri" Value="fabric:/BookFast/FilesService" />
    <Parameter Name="SearchServiceUri" Value="fabric:/BookFast/SearchService" />
    <Parameter Name="BookingServiceUri" Value="fabric:/BookFast/BookingService" />

<Parameter Name="Authentication:AzureAd:B2C:Audience" Value="Your Azure AD B2C API app client ID" />
    
    
    <Parameter Name="Authentication:AzureAd:B2C:Instance" Value="Your Azure AD B2C instance, e.g. https://login.microsoftonline.com/" />
    <Parameter Name="Authentication:AzureAd:B2C:TenantId" Value="Your Azure AD B2C tenant, e.g. devunleashedb2c.onmicrosoft.com" />
    <Parameter Name="Authentication:AzureAd:B2C:ClientId" Value="Your Azure AD B2C app client ID" />
    <Parameter Name="Authentication:AzureAd:B2C:ClientSecret" Value="Your Azure AD B2C app client secret" />
    <Parameter Name="Authentication:AzureAd:B2C:PostLogoutRedirectUri" Value="e.g. https://localhost:8686/" />
    <Parameter Name="Authentication:AzureAd:B2C:ApiIdentifier" Value="Your Azure AD B2C API app identifer" />
    <Parameter Name="Authentication:AzureAd:B2C:Policies:SignInOrSignUpPolicy" Value="B2C_1_TestSignUpAndSignInPolicy" />
    <Parameter Name="Authentication:AzureAd:B2C:Policies:EditProfilePolicy" Value="B2C_1_TestProfileEditPolicy" />
    <Parameter Name="Authentication:AzureAd:B2C:Policies:ResetPasswordPolicy" Value="B2C_1_TestPasswordReset" />

<Parameter Name="Authentication:AzureAd:ApiApp:Instance" Value="Your Azure AD instance, e.g. https://login.microsoftonline.com/" />
    <Parameter Name="Authentication:AzureAd:ApiApp:Audience" Value="BookFast API AppId in Azure AD, e.g. https://devunleashed.onmicrosoft.com/book-fast-api" />
    <Parameter Name="Authentication:AzureAd:ApiApp:ValidIssuers" Value="Comma separated list of tenant identifiers, e.g. https://sts.windows.net/490789ec-b183-4ba5-97cf-e69ec8870130/,https://sts.windows.net/f418e7eb-0dcd-40be-9b81-c58c87c57d9a/" />
   
    <Parameter Name="Authentication:AzureAd:WebApp:ApiResource" Value="BookFast API AppId in Azure AD, e.g. https://devunleashed.onmicrosoft.com/book-fast-api" />
    <Parameter Name="Authentication:AzureAd:WebApp:Instance" Value="Your Azure AD instance, e.g. https://login.microsoftonline.com/" />
    <Parameter Name="Authentication:AzureAd:WebApp:ValidIssuers" Value="Comma separated list of tenant identifiers, e.g. https://sts.windows.net/490789ec-b183-4ba5-97cf-e69ec8870130/,https://sts.windows.net/f418e7eb-0dcd-40be-9b81-c58c87c57d9a/" />
    <Parameter Name="Authentication:AzureAd:WebApp:ClientId" Value="Your BookFast app's client ID" />
    <Parameter Name="Authentication:AzureAd:WebApp:ClientSecret" Value="Your BookFast app's client secret" />
    <Parameter Name="Authentication:AzureAd:WebApp:PostLogoutRedirectUri" Value="e.g. https://localhost:8686/" />
    
  </Parameters>
</Application>
```

Please inspect service and application manifests to understand how these parameters are used to configure services.

### Azure AD

Azure AD is used for organizational accounts of facility providers. You will need two applications in Azure AD: one for the APIs (Book Fast API app) and one for the web (BookFast app). Both applications should have multitenant support enabled. BookFast should have a delegated permission to access BookFast API app. If you're new to Azure AD the following post are going to help you out:

- [Protecting your APIs with Azure Active Directory](https://dzimchuk.net/protecting-your-apis-with-azure-active-directory/)
- [Enabling multitenant support in you Azure AD protected applications](https://dzimchuk.net/enabling-multitenant-support-in-you-azure-ad-protected-applications/)

Both apps have a user role called 'Facility Provider' that should be assigned to users to enable them to edit facilities. Please have a look at this [post](https://dzimchuk.net/application-and-user-permissions-in-azure-ad/) to understand how application and user roles are configured in Azure AD.

### Azure AD B2C

Customer accounts are managed in Azure AD B2C. It supports self sign up, profile editing and 3rd part identity providers.

You will need to create a B2C tenant and an app. You will also need to policies:

1. Sign in or sign up policy
2. Profile edit policy

You may also find this [post](https://dzimchuk.net/setting-up-your-asp-net-core-2-0-apps-and-services-for-azure-ad-b2c/) useful when setting you your application.

### SQL Database

BookFast.Facility.Data contain EFCore migrations to set up you SQL database schema.

### Service Bus
Azure Service Bus is used as a message broker for integration events.

Please make sure to provision a single topic with 3 subscriptions:
- Booking
- Facility
- SearchIndexer

Also provision 2 notification queues:
- bookfast-facility-notifications
- bookfast-booking-notifications

### Azure Search

BookFast.Search.Adapter can be run from the command line as `dotnet run provision` in order to create an index in your Azure Search service. It will require the following parameters to be defined in [user secrets](https://docs.microsoft.com/en-us/aspnet/core/security/app-secrets):

- Search:ServiceName
- Search:AdminKey
- Search:IndexName

### Circuit Breaker

[BookingProxy](/BookFast.Web.Proxy/CircuitBreakingBookingProxy.cs) (web app) implements a [Circuit Breaker](https://docs.microsoft.com/en-us/azure/architecture/patterns/circuit-breaker) pattern. In order to test it, set `Test:FailRandom` parameter of the Booking service to `true`.

### Service clients

Each service provides a client library that makes it easier to consumers to communicate with them. The client libraries also implement necessary components for service endpoint resolution.

#### Using ServicePartitionClient

```
internal class FacilityProxy : IFacilityService
{
    private readonly IFacilityMapper mapper;
    private readonly IPartitionClientFactory<CommunicationClient<IBookFastFacilityAPI>> partitionClientFactory;

public FacilityProxy(IFacilityMapper mapper,
        IPartitionClientFactory<CommunicationClient<IBookFastFacilityAPI>> partitionClientFactory)
    {
        this.mapper = mapper;
        this.partitionClientFactory = partitionClientFactory;
    }

public async Task<Contracts.Models.Facility> FindAsync(Guid facilityId)
    {
        var result = await partitionClientFactory.CreatePartitionClient().InvokeWithRetryAsync(async client =>
        {
            var api = await client.CreateApiClient();
            return await api.FindFacilityWithHttpMessagesAsync(facilityId);
        });

if (result.Response.StatusCode == HttpStatusCode.NotFound)
        {
            throw new FacilityNotFoundException(facilityId);
        }

return mapper.MapFrom(result.Body);
    }
}
```

A consuming service should provide the following configuration section for the target service:

```
<Section Name="FacilityApi">
  <Parameter Name="ServiceUri" Value="fabric:/BookFast/FacilityService" />
  <Parameter Name="ServiceApiResource" Value="App ID URI of the API app in Azure AD" />
</Section>
```

#### Using Reverse Proxy

```
internal class FacilityProxy : IFacilityService
{
    private readonly IFacilityMapper mapper;
    private readonly IApiClientFactory<IBookFastFacilityAPI> apiClientFactory;

public FacilityProxy(IFacilityMapper mapper,
        IApiClientFactory<IBookFastFacilityAPI> apiClientFactory)
    {
        this.mapper = mapper;
        this.apiClientFactory = apiClientFactory;
    }

public async Task<Contracts.Models.Facility> FindAsync(Guid facilityId)
    {
        var api = await apiClientFactory.CreateApiClientAsync();
        var result = await api.FindFacilityWithHttpMessagesAsync(facilityId);

if (result.Response.StatusCode == HttpStatusCode.NotFound)
        {
            throw new FacilityNotFoundException(facilityId);
        }

return mapper.MapFrom(result.Body);
    }
}
```

The `ServiceUri` setting in this case points to the Reverse Proxy, e.g. `http://localhost:19081/BookFast/FacilityService/`.

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