Couchbase.Aspire.Client.DistributedCaching 1.0.0-alpha.4

Couchbase.Aspire.Client.DistributedCaching library

Registers an IDistributedCache in the DI container that connects to a Couchbase cluster. See Distributed Caching for more information. Enables corresponding health check, logging, and telemetry.

Getting Started

Prerequisites

• Couchbase or Capella cluster and connection string for accessing the cluster.

Install the package

dotnet add package Couchbase.Aspire.Client.DistributedCaching

Usage example

In the AppHost.cs file of your project, call the AddCouchbaseDistributedCache extension method to register an IDistributedCache for use via the dependency injection container. The method takes a connection name parameter.

builder.AddCouchbaseDistributedCache("couchbase");

You can then retrieve the IDistributedCache or ICouchbaseCache instance using dependency injection. For example, to retrieve the cache from a Web API controller:

private readonly IDistributedCache _cache;

public ProductsController(IDistributedCache cache)
{
    _cache = cache;
}

When using .NET 9.0 or later, you can register a HybridCache which caches both locally and in Couchbase. This also registers IDistributedCache and ICouchbaseCache.

builder.AddCouchbaseHybridCache("couchbase");

Configuration

The Aspire Couchbase component offers various options for configuring the database connection according to your project's requirements and conventions.

Use a connection string

When using a connection string from the ConnectionStrings configuration section, you can provide the name of the connection string as the parameter when calling AddCouchbaseDistributedCache:

builder.AddCouchbaseDistributedCache("myConnection");

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

{
  "ConnectionStrings": {
    "myConnection": "couchbases://username:password@server1:11207,server2:11207/mybucket?option1=value1&option2=value2"
  }
}

See the ConnectionString documentation for more information on how to format this connection string. Couchbase.Aspire.Client extends the standard connection string format by allowing the inclusion of the username, password, and bucket name directly in the connection string.

Use configuration providers

The Aspire Couchbase Distributed Cache component supports Microsoft.Extensions.Configuration. It loads the CouchbaseClientSettings from configuration by using the Aspire:Couchbase:Client key. Example appsettings.json that configures some of the options:

{
  "Aspire": {
    "Couchbase": {
      "Client": {
        "ConnectionString": "couchbases://server:port",
        "Username": "username",
        "Password": "password",
        "BucketName": "cache", // Optional bucket name
        "DisableHealthChecks": false,
        "DisableTracing": false,
        "HealthChecks": {
          "Type": "Active",
          "MinimumHealthyNodes": {
            "KeyValue": 2,
            "Query": 2
          },
          "MaximumUnhealthyNodes": {
            "KeyValue": 0,
            "Query": 1
          }
        }
      }
    }
  }
}

Use inline delegates

You can also pass the Action<CouchbaseClientSettings> delegate to set up some or all of the options inline:

    builder.AddCouchbaseDistributedCache("couchbase",
        settings => settings.ConnectionString = "couchbases://server:port");

Further tuning of ClusterOptions can be done by passing an additional Action<ClusterOptions> delegate:

    builder.AddCouchbaseDistributedCache("couchbase",
        settings => settings.ConnectionString = "couchbases://server:port",
        options => options.WithSerializer(SystemTextJsonSerializer.Create());

AppHost extensions

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

dotnet add package Couchbase.Aspire.Hosting

Then, in the AppHost.cs file of your project, register a Couchbase cluster and consume the connection using the following methods:

var couchbase = builder.AddCouchbase("couchbase");
var cache = couchbase.AddBucket("cache")
    .WithBucketType(BucketType.Ephemeral);

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

The WithReference method configures a connection to a bucket in the MyService project named cache. In the Program.cs file of MyService, the database connection can be consumed using:

builder.AddCouchbaseDistributedCache("cache");

Additional documentation

• https://learn.microsoft.com/aspnet/core/performance/caching/distributed
• https://github.com/dotnet/aspire/tree/main/src/Components/README.md

Feedback & contributing

https://github.com/couchbaselabs/couchbase-aspire