Aspire.NATS.Net

Aspire.NATS.Net library

Registers INatsConnection in the DI container for connecting NATS server. Enables corresponding health check and logging.

Getting started

Prerequisites

• NATS server and the server URL for accessing the server.

Install the package

Install the .NET Aspire NATS library with NuGet:

dotnet add package Aspire.NATS.Net

Usage example

In the Program.cs file of your project, call the AddNatsClient extension method to register a INatsConnection for use via the dependency injection container. The method takes a connection name parameter.

builder.AddNatsClient("nats");

You can then retrieve a INatsConnection instance using dependency injection. For example, to retrieve a connection from a Web API controller:

private readonly INatsConnection _connection;

public ProductsController(INatsConnection connection)
{
    _connection = connection;
}

Configuration

The .NET Aspire NATS component provides multiple options to configure the NATS connection based on the requirements and conventions of your project.

Use a connection string

When using a connection string from the ConnectionStrings configuration section, you can provide the name of the connection string when calling builder.AddNatsClient():

builder.AddNatsClient("myConnection");

And then the connection string will be retrieved from the ConnectionStrings configuration section:

{
  "ConnectionStrings": {
    "myConnection": "nats://nats:4222"
  }
}

See the ConnectionString documentation for more information on how to format this connection string.

Use configuration providers

The .NET Aspire NATS component supports Microsoft.Extensions.Configuration. It loads the NatsClientSettings from configuration by using the Aspire:Nats:Client key. Example appsettings.json that configures some of the options:

{
  "Aspire": {
    "Nats": {
      "Client": {
        "HealthChecks": false
      }
    }
  }
}

Use inline delegates

Also you can pass the Action<NatsClientSettings> configureSettings delegate to set up some or all the options inline, for example to disable health checks from code:

builder.AddNatsClient("nats", settings => settings.HealthChecks = false);

AppHost extensions

In your AppHost project, install the Aspire.Hosting.Nats library with NuGet:

dotnet add package Aspire.Hosting.Nats

Then, in the Program.cs file of AppHost, register a NATS server and consume the connection using the following methods:

var nats = builder.AddNats("nats");

var myService = builder.AddProject<Projects.MyService>()
                       .WithReference(nats);

The WithReference method configures a connection in the MyService project named nats. In the Program.cs file of MyService, the NATS connection can be consumed using:

builder.AddNatsClient("nats");

Additional documentation

• https://nats-io.github.io/nats.net.v2/documentation/intro.html
• https://github.com/dotnet/aspire/tree/main/src/Components/README.md

Feedback & contributing

https://github.com/dotnet/aspire