CleanCodeJN.GenericApis.ServiceBusConsumer 1.0.3

Generic Web Apis for Service Bus - Extension Package

Service Bus Consumer with IOSP and Command Pattern

This CleanCodeJN package for Service Bus simplifies the development of asynchronous microservices by providing a framework that leverages the power of MediatR and IOSP to consume service bus events from topics and execute commands to process these events.

Features

• Built in Service Bus Consumer for multiple configurable Topics and Subscriptions
• Uses Mediator and IOSP to execute Commands for processing Events
• Built in Retry concept
• Custom Configuration implementation required for event logging and configuration management
• On latest .NET 8.0

How to use

• Implement IServiceBusConsumerConfigurationService
• Add RegisterServiceBusConsumer<YourServiceBusConsumerConfigurationService>() to your Program.cs
• Add Service Bus Configuration to your appsettings.json and your Configuration classes
• Consume Events by just posting events to the Service Bus

Step by step explanation

Implement the full IServiceBusConsumerConfigurationService

public class SampleServiceBusConsumerConfigurationService(
    IOptionsMonitor<SampleConfiguration> configuration,
    ILogger<SampleServiceBusConsumerConfigurationService> logger) : IServiceBusConsumerConfigurationService
{
    public virtual bool IsLocalEnvironment() => Environment.GetEnvironmentVariable("IS_LOCAL")?.Equals("true") ?? false;

    public virtual void PrintLogoForDebugging() => StringExtensions.PrintLogo();

    public virtual string PrintStartTextForDebugging() => "Please add the event as JSON and press ENTER twice.";

    public virtual string GetServiceBusConnectionString() => configuration.CurrentValue.ServiceBus.ConnectionString;

    public virtual ServiceBusConfiguration GetServiceBusTopicConfiguration() => configuration.CurrentValue.ServiceBus;

    public virtual void LogIncomingEvent(string name, string body) => logger.LogDebug($"EventRequest_{name.Replace(" ", string.Empty)}", body);

    public virtual string MaxRetryMessage(ProcessMessageEventArgs args) => "Max Retry reached";

    public virtual void LogMaxRetryReached(ProcessMessageEventArgs args) => logger.LogCritical(message: MaxRetryMessage(args));

    public virtual List<Assembly> GetCommandAssemblies() => [typeof(UpdateInvoiceEventRequest).Assembly];

    public virtual Task LogAndHandleException(Exception exception, string message)
    {
        logger.LogCritical(exception, message);
        return Task.CompletedTask;
    }

    public virtual void LogExecutionResponse(string body, Response response, Exception exception = null) =>
        logger.LogDebug($"EventResponse_{JsonSerializer.Deserialize<JsonElement>(body).GetProperty("Name").GetString().Replace(" ", string.Empty)}_{(response.Succeeded ? "Success" : "Failure")}", new Dictionary<string, string>
    {
        { nameof(response.Succeeded), response.Succeeded.ToString() },
        { nameof(response.Message), response.Message ?? exception?.Message },
        { nameof(response.Info), response.Info },
        { nameof(exception), exception?.StackTrace },
        { "data", body }
    });
}

Or derive from ServiceBusConsumerConfigurationServiceBase for using reasonable defaults and only override the following methods

public class SampleServiceBusConsumerConfigurationService(
    IOptionsMonitor<SampleConfiguration> configuration,
    ILogger<SampleServiceBusConsumerConfigurationService> logger) : ServiceBusConsumerConfigurationServiceBase(logger)
{
    public override ServiceBusConfiguration GetServiceBusTopicConfiguration() => configuration.CurrentValue.ServiceBus;

    public override List<Assembly> GetCommandAssemblies() => [typeof(UpdateInvoiceEventRequest).Assembly];
}

Add RegisterServiceBusConsumer<YourServiceBusConsumerConfigurationService>() to your Program.cs

builder.Services.RegisterServiceBusConsumer<SampleServiceBusConsumerConfigurationService>(
   builder.Configuration["ServiceBus:ConnectionString"],
   [typeof(UpdateInvoiceEventRequest).Assembly]);

Add Service Bus Configuration to your appsettings.json and your Configuration classes

 {
    "ServiceBus": {
            "MaxRetryCount": 30,
            "RetryDelayInMinutes": 10,
            "ConnectionString": "",
            "TopicConfigurations": [
                {
                    "Name": "topicA",
                    "SubscriptionName": "general",
                    "MaxAutoLockRenewalDurationInMinutes": 15,
                    "PrefetchCount": 10,
                    "MaxConcurrentCalls": 5
                },
                {
                    "Name": "topicB",
                    "SubscriptionName": "general",
                    "MaxAutoLockRenewalDurationInMinutes": 15,
                    "PrefetchCount": 10,
                    "MaxConcurrentCalls": 5
                }
            ]
        }
 }

Consume Events by just posting events to the Service Bus

{
    "InstanceId": "<Guid>",
    "Name": "Event Name",
    "Type": "CleanCodeJN.GenericApis.ServiceBusConsumer.Sample.Commands.UpdateInvoiceEventRequest",
    "Environment": "Production",
    "CreatedAt": "2024-03-25 16:05:50",
    "CreatedFrom": "Event Producer",
    "RequestId": "Businnss process Id",
    "RetryCount": 0,
    "Topic": "invoices",
    "Data": 
    {
        // Payload
    }
}

If you want to use the Generic Apis Commands and Repositories together with the Service Bus Consumer, than register everything as below

var builder = Host.CreateApplicationBuilder(args);

List<Assembly> assemblies = [
    typeof(CleanCodeJN.GenericApis.Sample.Business.AssemblyRegistration).Assembly,
    typeof(CleanCodeJN.GenericApis.Sample.Core.AssemblyRegistration).Assembly,
    typeof(CleanCodeJN.GenericApis.Sample.Domain.AssemblyRegistration).Assembly,
    Assembly.GetExecutingAssembly(),
];

builder.Services.Configure<SampleConfiguration>(builder.Configuration);

builder.Services
            .RegisterValidatorsFromAssembly(typeof(CleanCodeJN.GenericApis.Sample.Core.AssemblyRegistration).Assembly)
            .RegisterGenericCommands(assemblies)
            .RegisterAutomapper(assemblies)
            .RegisterServiceBusConsumer<SampleServiceBusConsumerConfigurationService>(builder.Configuration["ServiceBus:ConnectionString"], assemblies)
            .RegisterDbContextAndRepositories<MyDbContext>();

await builder.Build().RunAsync();

Link to Sample Code

Sample Project