feat: Add OpenFeature.Extensions.Hosting package #181
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| Original file line number | Diff line number | Diff line change |
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| 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); | ||
|
There was a problem hiding this comment. I don't think the meta-data name for a provider is an appropriate name here. We probably need a way to make providers that encapsulates that data. Simple example is using one provider with two different environments. But more than that the provider name is a different domain of names. It is the domain of the provider implementation, where client names are in the domain of the application. An application developer needs to know and assign that name. |
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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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| Original file line number | Diff line number | Diff line change |
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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> | ||
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There was a problem hiding this comment. Should .NET 7 be included as TFM? .NET 7 is out of official support |
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| </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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| Original file line number | Diff line number | Diff line change |
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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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| Original file line number | Diff line number | Diff line change |
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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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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -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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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| #nullable enable | ||
| using System; | ||
| using System.Diagnostics; | ||
| using System.Runtime.CompilerServices; | ||
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| namespace OpenFeature; | ||
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| [DebuggerStepThrough] | ||
| static class Check | ||
| { | ||
| public static T NotNull<T>(T? value, [CallerArgumentExpression("value")] string name = null!) | ||
| { | ||
| #if NET8_0_OR_GREATER | ||
| ArgumentNullException.ThrowIfNull(value, name); | ||
| #else | ||
| if (value is null) | ||
| throw new ArgumentNullException(name); | ||
| #endif | ||
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| return value; | ||
| } | ||
| } |
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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.