Qdrant Client integration reference

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To get started with the Aspire Qdrant integrations, follow the Get started with Qdrant integrations guide.

This article includes full details about the Aspire Qdrant Client integration, which allows you to connect to and interact with Qdrant vector databases from your Aspire consuming projects.

Installation

You need a Qdrant server and connection information for accessing the server. To get started with the Aspire Qdrant client integration, install the 📦 Aspire.Qdrant.Client NuGet package in the client-consuming project, that is, the project for the application that uses the Qdrant client. The Qdrant client integration registers a QdrantClient instance that you can use to interact with Qdrant.

dotnet add package Aspire.Qdrant.Client

#:package Aspire.Qdrant.Client@*

<PackageReference Include="Aspire.Qdrant.Client" Version="*" />

Add Qdrant client

In the Program.cs file of your client-consuming project, call the AddQdrantClient extension method on any IHostApplicationBuilder to register a QdrantClient for use via the dependency injection container. The method takes a connection name parameter.

builder.AddQdrantClient(connectionName: "qdrant");

You can then retrieve the QdrantClient instance using dependency injection. For example, to retrieve the connection from an example service:

public class ExampleService(QdrantClient client)
{
    // Use Qdrant client...
}

For more information on dependency injection, see .NET dependency injection.

Add keyed Qdrant client

There might be situations where you want to register multiple QdrantClient instances with different connection strings. To register keyed Qdrant clients, call the AddKeyedQdrantClient method:

builder.AddKeyedQdrantClient(name: "mainQdrant");
builder.AddKeyedQdrantClient(name: "loggingQdrant");

Then retrieve the instances using dependency injection:

public class ExampleService(
    [FromKeyedServices("mainQdrant")] QdrantClient mainQdrantClient,
    [FromKeyedServices("loggingQdrant")] QdrantClient loggingQdrantClient)
{
    // Use clients...
}

For more information on keyed services, see .NET dependency injection: Keyed services.

Properties of the Qdrant resources

When you use the WithReference method to pass a Qdrant server resource from the AppHost project to a consuming client project, several properties are available to use in the consuming project.

Aspire exposes each property as an environment variable named [RESOURCE]_[PROPERTY]. For instance, the Uri property of a resource called qdrant becomes QDRANT_URI.

Qdrant server

The Qdrant server resource exposes the following connection properties:

Property Name	Description
`GrpcHost`	The gRPC hostname of the Qdrant server
`GrpcPort`	The gRPC port of the Qdrant server
`HttpHost`	The HTTP hostname of the Qdrant server
`HttpPort`	The HTTP port of the Qdrant server
`ApiKey`	The API key for authentication
`Uri`	The gRPC connection URI, with the format `http://{GrpcHost}:{GrpcPort}`
`HttpUri`	The HTTP connection URI, with the format `http://{HttpHost}:{HttpPort}`

Example connection strings:

Uri: http://localhost:6334
HttpUri: http://localhost:6333

Configuration

The Aspire Qdrant client integration provides multiple configuration approaches and options to meet the requirements and conventions of your project.

Use a connection string

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

builder.AddQdrantClient("qdrant");

The connection string is retrieved from the ConnectionStrings configuration section. By default the QdrantClient uses the gRPC API endpoint:

{
  "ConnectionStrings": {
    "qdrant": "Endpoint=http://localhost:6334;Key=123456!@#$%"
  }
}

For more information about the Qdrant connection string format, see the Qdrant documentation.

Use configuration providers

The Aspire Qdrant client integration supports Microsoft.Extensions.Configuration from configuration files such as appsettings.json by using the Aspire:Qdrant:Client key. If you have set up your configurations in the Aspire:Qdrant:Client section you can just call the method without passing any parameter.

The following is an example of an appsettings.json that configures some of the available options:

{
  "Aspire": {
    "Qdrant": {
      "Client": {
        "Endpoint": "http://localhost:6334/",
        "Key": "123456!@#$%"
      }
    }
  }
}

Use inline delegates

You can also pass the Action<QdrantSettings> delegate to set up some or all the options inline, for example to set the API key from code:

builder.AddQdrantClient(
    "qdrant",
    settings => settings.Key = "12345!@#$%");

Configuration options

Here are the configurable options with corresponding default values:

Name	Description
`Endpoint`	The endpoint URI of the Qdrant server to connect to.
`Key`	The API key used for authentication.
`DisableHealthChecks`	A boolean value that indicates whether the health check is disabled or not.
`DisableTracing`	A boolean value that indicates whether the OpenTelemetry tracing is disabled or not.

Client integration health checks

By default, Aspire integrations enable health checks for all services. For more information, see Aspire integrations overview.

By default, the Aspire Qdrant client integration handles the following:

Checks if the QdrantSettings.DisableHealthChecks is true.
If not disabled, adds a health check that verifies the Qdrant server is reachable.

Observability and telemetry

Aspire integrations automatically set up Logging, Tracing, and Metrics configurations, which are sometimes known as the pillars of observability. Depending on the backing service, some integrations may only support some of these features. For example, some integrations support logging and tracing, but not metrics. Telemetry features can also be disabled using the techniques presented in the Configuration section.

Logging

The Aspire Qdrant client integration uses the following log categories:

Qdrant.Client

Tracing and Metrics

The Qdrant integration doesn’t currently emit tracing activities or metrics because they are not supported by the Qdrant.Client library.