feat: Add OpenFeature.Extensions.Hosting package #181
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@@ -67,6 +67,29 @@ public async Task Example() | |
| } | ||
| ``` | ||
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| ### Dependency Injection Usage | ||
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| ```csharp | ||
| // Register your feature flag provider | ||
| builder.Services.AddOpenFeature(static builder => | ||
| { | ||
| builder.Services.TryAddEnumerable(ServiceDescriptor.Singleton<FeatureProvider, SomeFeatureProvider>()); | ||
| builder.TryAddOpenFeatureClient(SomeFeatureProvider.Name); | ||
|
There was a problem hiding this comment. Is it possible to do request scoped DI? It would be really great to include an example where you sent request specific context in the client. Since it's a slightly more advanced topic, perhaps it could be included in the evaluation context section later in the doc. There was a problem hiding this comment. It looks like it should work. Here's an example from .NET FeatureManagement. https://github.com/microsoft/FeatureManagement-Dotnet?tab=readme-ov-file#using-httpcontext |
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| }); | ||
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| // Inject the client | ||
| app.MapGet("/flag", async ([FromServices]IFeatureClient client) => | ||
| { | ||
| // Evaluate your feature flag | ||
| var flag = await client.GetBooleanValue("some_flag", true).ConfigureAwait(true); | ||
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| if (flag) | ||
| { | ||
| // Do some work | ||
| } | ||
| }) | ||
| ``` | ||
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| ## 🌟 Features | ||
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| | Status | Features | Description | | ||
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| @@ -0,0 +1,33 @@ | ||
| using System.Collections.Generic; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
| using Microsoft.Extensions.Hosting; | ||
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| namespace OpenFeature.Internal; | ||
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| internal sealed class OpenFeatureHostedService(Api api, IEnumerable<FeatureProvider> providers) : IHostedLifecycleService | ||
| { | ||
| readonly Api _api = Check.NotNull(api); | ||
| readonly IEnumerable<FeatureProvider> _providers = Check.NotNull(providers); | ||
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| async Task IHostedLifecycleService.StartingAsync(CancellationToken cancellationToken) | ||
| { | ||
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| foreach (var provider in this._providers) | ||
| { | ||
| await this._api.SetProviderAsync(provider.GetMetadata()?.Name ?? string.Empty, provider).ConfigureAwait(false); | ||
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| if (this._api.GetProviderMetadata() is { Name: "No-op Provider" }) | ||
| await this._api.SetProviderAsync(provider).ConfigureAwait(false); | ||
| } | ||
| } | ||
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| Task IHostedService.StartAsync(CancellationToken cancellationToken) => Task.CompletedTask; | ||
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| Task IHostedLifecycleService.StartedAsync(CancellationToken cancellationToken) => Task.CompletedTask; | ||
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| Task IHostedLifecycleService.StoppingAsync(CancellationToken cancellationToken) => Task.CompletedTask; | ||
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| Task IHostedService.StopAsync(CancellationToken cancellationToken) => Task.CompletedTask; | ||
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| Task IHostedLifecycleService.StoppedAsync(CancellationToken cancellationToken) => this._api.ShutdownAsync(); | ||
| } | ||
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| @@ -0,0 +1,25 @@ | ||
| <Project Sdk="Microsoft.NET.Sdk"> | ||
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| <PropertyGroup> | ||
| <Nullable>enable</Nullable> | ||
| <TargetFrameworks>netstandard2.0;net6.0;net7.0;net8.0;net462</TargetFrameworks> | ||
| </PropertyGroup> | ||
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| <PropertyGroup> | ||
| <PackageReadmeFile>README.md</PackageReadmeFile> | ||
| <RootNamespace>OpenFeature</RootNamespace> | ||
| </PropertyGroup> | ||
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| <ItemGroup> | ||
| <None Include="../../README.md" Pack="true" PackagePath="/" /> | ||
| </ItemGroup> | ||
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| <ItemGroup> | ||
| <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" /> | ||
| </ItemGroup> | ||
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| <ItemGroup> | ||
| <ProjectReference Include="../OpenFeature/OpenFeature.csproj" /> | ||
| </ItemGroup> | ||
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| </Project> |
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| @@ -0,0 +1,9 @@ | ||
| using Microsoft.Extensions.DependencyInjection; | ||
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| namespace OpenFeature; | ||
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| /// <summary> | ||
| /// Describes a <see cref="OpenFeatureBuilder"/> backed by an <see cref="IServiceCollection"/>. | ||
| /// </summary> | ||
| /// <param name="ServiceCollection"><see cref="IServiceCollection"/></param> | ||
| public sealed record OpenFeatureBuilder(IServiceCollection ServiceCollection); | ||
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| @@ -0,0 +1,145 @@ | ||
| using System; | ||
| using Microsoft.Extensions.DependencyInjection; | ||
| using Microsoft.Extensions.DependencyInjection.Extensions; | ||
| using Microsoft.Extensions.Logging; | ||
| using OpenFeature.Internal; | ||
| using OpenFeature.Model; | ||
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| namespace OpenFeature; | ||
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| /// <summary> | ||
| /// Contains extension methods for the <see cref="OpenFeatureBuilder"/> class. | ||
| /// </summary> | ||
| public static class OpenFeatureBuilderExtensions | ||
| { | ||
| /// <summary> | ||
| /// This method is used to add a new context to the service collection. | ||
| /// </summary> | ||
| /// <param name="builder"><see cref="OpenFeatureBuilder"/></param> | ||
| /// <param name="configure">the desired configuration</param> | ||
| /// <returns> | ||
| /// the <see cref="OpenFeatureBuilder"/> instance | ||
| /// </returns> | ||
| public static OpenFeatureBuilder AddContext( | ||
| this OpenFeatureBuilder builder, | ||
| Action<EvaluationContextBuilder> configure) | ||
| { | ||
| Check.NotNull(builder); | ||
| Check.NotNull(configure); | ||
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| AddContext(builder, null, (b, _, _) => configure(b)); | ||
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| return builder; | ||
| } | ||
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| /// <summary> | ||
| /// This method is used to add a new context to the service collection. | ||
| /// </summary> | ||
| /// <param name="builder"><see cref="OpenFeatureBuilder"/></param> | ||
| /// <param name="configure">the desired configuration</param> | ||
| /// <returns> | ||
| /// the <see cref="OpenFeatureBuilder"/> instance | ||
| /// </returns> | ||
| public static OpenFeatureBuilder AddContext( | ||
| this OpenFeatureBuilder builder, | ||
| Action<EvaluationContextBuilder, IServiceProvider> configure) | ||
| { | ||
| Check.NotNull(builder); | ||
| Check.NotNull(configure); | ||
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| AddContext(builder, null, (b, _, s) => configure(b, s)); | ||
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| return builder; | ||
| } | ||
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| /// <summary> | ||
| /// This method is used to add a new context to the service collection. | ||
| /// </summary> | ||
| /// <param name="builder"><see cref="OpenFeatureBuilder"/></param> | ||
| /// <param name="providerName">the name of the provider</param> | ||
| /// <param name="configure">the desired configuration</param> | ||
| /// <returns> | ||
| /// the <see cref="OpenFeatureBuilder"/> instance | ||
| /// </returns> | ||
| public static OpenFeatureBuilder AddContext( | ||
| this OpenFeatureBuilder builder, | ||
| string? providerName, | ||
| Action<EvaluationContextBuilder, string?, IServiceProvider> configure) | ||
| { | ||
| Check.NotNull(builder); | ||
| Check.NotNull(configure); | ||
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| builder.ServiceCollection.AddKeyedSingleton(providerName, (services, key) => | ||
| { | ||
| var b = EvaluationContext.Builder(); | ||
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| configure(b, key as string, services); | ||
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| return b.Build(); | ||
| }); | ||
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| return builder; | ||
| } | ||
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| /// <summary> | ||
| /// This method is used to add a new feature client to the service collection. | ||
| /// </summary> | ||
| /// <param name="builder"><see cref="OpenFeatureBuilder"/></param> | ||
| /// <param name="providerName">the name of the provider</param> | ||
| public static void TryAddOpenFeatureClient(this OpenFeatureBuilder builder, string? providerName = null) | ||
| { | ||
| Check.NotNull(builder); | ||
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| builder.ServiceCollection.AddHostedService<OpenFeatureHostedService>(); | ||
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| builder.ServiceCollection.TryAddKeyedSingleton(providerName, static (services, providerName) => | ||
| { | ||
| var api = providerName switch | ||
| { | ||
| null => Api.Instance, | ||
| not null => services.GetRequiredKeyedService<Api>(null) | ||
| }; | ||
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| api.AddHooks(services.GetKeyedServices<Hook>(providerName)); | ||
| api.SetContext(services.GetRequiredKeyedService<EvaluationContextBuilder>(providerName).Build()); | ||
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| return api; | ||
| }); | ||
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| builder.ServiceCollection.TryAddKeyedSingleton(providerName, static (services, providerName) => providerName switch | ||
| { | ||
| null => services.GetRequiredService<ILogger<FeatureClient>>(), | ||
| not null => services.GetRequiredService<ILoggerFactory>().CreateLogger($"OpenFeature.FeatureClient.{providerName}") | ||
| }); | ||
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| builder.ServiceCollection.TryAddKeyedTransient(providerName, static (services, providerName) => | ||
| { | ||
| var builder = providerName switch | ||
| { | ||
| null => EvaluationContext.Builder(), | ||
| not null => services.GetRequiredKeyedService<EvaluationContextBuilder>(null) | ||
| }; | ||
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| foreach (var c in services.GetKeyedServices<EvaluationContext>(providerName)) | ||
| { | ||
| builder.Merge(c); | ||
| } | ||
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| return builder; | ||
| }); | ||
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| builder.ServiceCollection.TryAddKeyedTransient<IFeatureClient>(providerName, static (services, providerName) => | ||
| { | ||
| var api = services.GetRequiredService<Api>(); | ||
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| return api.GetClient( | ||
| api.GetProviderMetadata(providerName as string ?? string.Empty)?.Name, | ||
| null, | ||
| services.GetRequiredKeyedService<ILogger>(providerName), | ||
| services.GetRequiredKeyedService<EvaluationContextBuilder>(providerName).Build()); | ||
| }); | ||
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| if (providerName is not null) | ||
| builder.ServiceCollection.Replace(ServiceDescriptor.Transient(services => services.GetRequiredKeyedService<IFeatureClient>(providerName))); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| using System; | ||
| using OpenFeature; | ||
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| #pragma warning disable IDE0130 // Namespace does not match folder structure | ||
| // ReSharper disable once CheckNamespace | ||
| namespace Microsoft.Extensions.DependencyInjection; | ||
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| /// <summary> | ||
| /// Contains extension methods for the <see cref="IServiceCollection"/> class. | ||
| /// </summary> | ||
| public static class OpenFeatureServiceCollectionExtensions | ||
| { | ||
| /// <summary> | ||
| /// This method is used to add OpenFeature to the service collection. | ||
| /// OpenFeature will be registered as a singleton. | ||
| /// </summary> | ||
| /// <param name="services"><see cref="IServiceCollection"/></param> | ||
| /// <param name="configure">the desired configuration</param> | ||
| /// <returns>the current <see cref="IServiceCollection"/> instance</returns> | ||
| public static IServiceCollection AddOpenFeature(this IServiceCollection services, Action<OpenFeatureBuilder> configure) | ||
| { | ||
| Check.NotNull(services); | ||
| Check.NotNull(configure); | ||
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| configure(AddOpenFeature(services)); | ||
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| return services; | ||
| } | ||
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| /// <summary> | ||
| /// This method is used to add OpenFeature to the service collection. | ||
| /// OpenFeature will be registered as a singleton. | ||
| /// </summary> | ||
| /// <param name="services"><see cref="IServiceCollection"/></param> | ||
| /// <returns>the current <see cref="IServiceCollection"/> instance</returns> | ||
| public static OpenFeatureBuilder AddOpenFeature(this IServiceCollection services) | ||
| { | ||
| Check.NotNull(services); | ||
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| var builder = new OpenFeatureBuilder(services); | ||
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| builder.TryAddOpenFeatureClient(); | ||
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| return builder; | ||
| } | ||
| } |
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| @@ -0,0 +1,24 @@ | ||
| // @formatter:off | ||
| // ReSharper disable All | ||
| #if NETCOREAPP3_0_OR_GREATER | ||
| // https://github.com/dotnet/runtime/issues/96197 | ||
| [assembly: System.Runtime.CompilerServices.TypeForwardedTo(typeof(System.Runtime.CompilerServices.CallerArgumentExpressionAttribute))] | ||
| #else | ||
| #pragma warning disable | ||
| // Licensed to the .NET Foundation under one or more agreements. | ||
| // The .NET Foundation licenses this file to you under the MIT license. | ||
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| namespace System.Runtime.CompilerServices | ||
| { | ||
| [AttributeUsage(AttributeTargets.Parameter, AllowMultiple = false, Inherited = false)] | ||
| internal sealed class CallerArgumentExpressionAttribute : Attribute | ||
| { | ||
| public CallerArgumentExpressionAttribute(string parameterName) | ||
| { | ||
| ParameterName = parameterName; | ||
| } | ||
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| public string ParameterName { get; } | ||
| } | ||
| } | ||
| #endif |
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We'll need to time this merge closely with the release or move this to a separate PR that can be merged after the 2.0 release.