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https://github.com/christopherread/Obvs

An observable microservice bus library for .NET, that wraps the underlying message transports in simple Rx based interfaces.
https://github.com/christopherread/Obvs

csharp dotnet messaging microservices observable obvs reactive-extensions servicebus

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An observable microservice bus library for .NET, that wraps the underlying message transports in simple Rx based interfaces.

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README 

        


# Obvs: an observable microservice bus

## observable services, *obviously*



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### Features



* Obvs is just a library, not a framework - use as much or as little as you need.

* Leverage messaging and Reactive Extensions to quickly compose a system of decoupled microservices.

* Add new services and message contracts with a minimal amount of code and effort.

* Don't tie yourself to any one transport, migrate between transports with minimal code changes required

* Use a mix of transports and serialization formats, allowing you to pick what works for your services.

* Declare a new Obvs ServiceBus easily using the fluent code based configuration.

* Don't want to use Obvs message contract interfaces? Use the generic ServiceBus and supply your own.

* Standardize on messaging semantics throughout by wrapping integrations with external API's as custom endpoints.

* Don't distribute if you don't need to, Obvs ServiceBus includes a local in-memory bus.

* Use one of the many available serialization extensions, or even write your own.

* Easily debug and monitor your application using logging and performance counter extensions.



### Versions/Roadmap



* V6 - `System.Reactive 5.0`, supports `netstandard2.0`, `net472` and `net5.0`.  Mono-repo

* V5 - `System.Reactive 4.1`, supports `netstandard2.0` and `net472`

* V4 - `System.Reactive 3.1.1`, supports `netstandard1.6` and `net452` 



### More Details



* Convention based messaging over topics/queues/streams per service.

* Multiplexing of multiple message types over single topics/queues/streams.

* Dynamic creation of deserializers per type, auto-discovery of message contracts.

* Exceptions are caught and raised on an asynchronous error channel.



### Extensions



* Transports: ActiveMQ / RabbitMQ / NetMQ / AzureServiceBus / Kafka / EventStore

* Serialization: XML / JSON.Net / NetJson / ProtoBuf / MsgPack

* Logging: NLog / log4net

* Monitoring: Performance Counters / ElasticSearch

* Integrations: Slack



## Example



Define a root message type to identify messages as belonging to your service:



	public interface IMyServiceMessage : IMessage { }



Create command/event/request/response message types:



	public class MyCommand : IMyServiceMessage, ICommand { }



	public class MyEvent : IMyServiceMessage, IEvent { }



	public class MyRequest: IMyServiceMessage, IRequest { }

	

	public class MyResponse : IMyServiceMessage, IResponse { }



Create your service bus:



	IServiceBus serviceBus = ServiceBus.Configure()

        .WithActiveMQEndpoints()

            .Named("MyService")

            .UsingQueueFor()

            .ConnectToBroker("tcp://localhost:61616")

            .SerializedAsJson()

            .AsClientAndServer()

        .Create();



Send commands:



	serviceBus.Commands.Subscribe(c => Console.WriteLine("Received a command!"));

	await serviceBus.SendAsync(new MyCommand());



Publish events:



	serviceBus.Events.Subscribe(e => Console.WriteLine("Received an event!"));

	await serviceBus.PublishAsync(new MyEvent());

	

Request/response:



	serviceBus.Requests

		  .OfType()

		  .Subscribe(request => serviceBus.ReplyAsync(request, new MyResponse()));

	

	serviceBus.GetResponses(new MyRequest())

		  .OfType()

		  .Take(1)

		  .Timeout(TimeSpan.FromSeconds(1))

		  .Subscribe(r => Console.WriteLine("Received a response!"), err => Console.WriteLine("Oh no!"));



Define custom endpoints that can wrap API calls or integrations with other systems:

	

	public class MyCustomEndpoint : IServiceEndpointClient

    	{

        	Type _serviceType = typeof(IMyCustomServiceMessage);



        	public IObservable Events

        	{

            		get

            		{

                		// subscribe to external MQ broker

            		}

        	}



        	public Task SendAsync(ICommand command)

        	{

            		// call external API

        	}



        	public IObservable GetResponses(IRequest request)

        	{

            		// call external API and wrap response in observable

        	}



        	public bool CanHandle(IMessage message)

        	{

            		return _serviceType.IsInstanceOfType(message);

        	}

    	}

		

	...



	IServiceBus serviceBus = ServiceBus.Configure()

          .WithActiveMQEndpoints()

            .Named("MyService")

            .UsingQueueFor()

            .ConnectToBroker("tcp://localhost:61616")

            .SerializedAsJson()

            .AsClientAndServer()

	  .WithEndpoints(new MyCustomEndpoint())

        .Create();



## Run Examples in Docker



	cd examples

	docker-compose up



	cd client

	dotnet run -f netcoreapp3.1