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This PR is the inital openfeature provider for the Harness feature flag SDK. It supports * basic targeting (via target name and identifier) * bool, number, string, evaluations Left to do: * structured evaluations * custom target attributes * unit testing * provider configuration
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src/OpenFeature.Contrib.Providers.Harness/HarnessAdapter.cs
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| using io.harness.cfsdk.client.dto; | ||
| using OpenFeature.Model; | ||
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| namespace OpenFeature.Contrib.Providers.Harness; | ||
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| /// <summary> | ||
| /// HarnessAdapter is the .NET adapter for the Harness feature flag SDK | ||
| /// It provides functions to convert the OpenFeature EvaluationContext to | ||
| /// a harness target, and functions to convert the Harness evaluation result | ||
| /// to a OpenFeature ResolutionDetails. | ||
| /// </summary> | ||
| public static class HarnessAdapter | ||
| { | ||
| /// <summary> | ||
| /// Convert the Harness evaluation result to a OpenFeature ResolutionDetails. | ||
| /// </summary> | ||
| /// <param name="flagKey"></param> | ||
| /// <param name="defaultValue"></param> | ||
| /// <typeparam name="T"></typeparam> | ||
| /// <returns></returns> | ||
| public static ResolutionDetails<T> HarnessResponse<T>(string flagKey, T defaultValue) | ||
| { | ||
| /* | ||
| * string flagKey, T value, ErrorType errorType = ErrorType.None, string reason = null, | ||
| string variant = null, string errorMessage = null | ||
| */ | ||
| return new ResolutionDetails<T>( | ||
| flagKey, | ||
| defaultValue); | ||
| } | ||
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| /// <summary> | ||
| /// Convert the OpenFeature EvaluationContext to a harness target. | ||
| /// </summary> | ||
| /// <param name="context"></param> | ||
| /// <returns></returns> | ||
| public static Target CreateTarget(EvaluationContext context) | ||
| { | ||
| // Get the identifier, if it is missing or empty return null | ||
| if (context.TryGetValue("identifier", out var identifier) != true || identifier.IsString != true) | ||
| { | ||
| return null; | ||
| } | ||
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| // Get the name, if it is missing or empty return null | ||
| if (context.TryGetValue("name", out var name) != true || name.IsString != true) | ||
| { | ||
| return null; | ||
| } | ||
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| // Create a target (different targets can get different results based on rules) | ||
| // TODO we need to deal with target attributes | ||
| // .Attributes(new Dictionary<string, string>(){{"email", "[email protected]"}}) | ||
| Target target = Target.builder() | ||
| .Name(name.AsString) | ||
| .Identifier(identifier.AsString) | ||
| .build(); | ||
| return target; | ||
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| } | ||
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| } |
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src/OpenFeature.Contrib.Providers.Harness/OpenFeature.Contrib.Providers.Harness.csproj
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| <Project Sdk="Microsoft.NET.Sdk"> | ||
| <PropertyGroup> | ||
| <PackageId>OpenFeature.Contrib.Providers.Harness</PackageId> | ||
| <VersionNumber>0.0.1</VersionNumber> | ||
| <Version>$(VersionNumber)</Version> | ||
| <AssemblyVersion>$(VersionNumber)</AssemblyVersion> | ||
| <FileVersion>$(VersionNumber)</FileVersion> | ||
| <Description>Harness Feature Flag provider for .NET</Description> | ||
| <PackageProjectUrl>https://www.harness.io/products/feature-flags</PackageProjectUrl> | ||
| <RepositoryUrl>https://github.com/open-feature/dotnet-sdk-contrib</RepositoryUrl> | ||
| <Authors>Dave Johnston</Authors> | ||
| </PropertyGroup> | ||
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| <ItemGroup> | ||
| <PackageReference Include="System.Text.Json" Version="7.0.4" /> | ||
| <PackageReference Include="ff-dotnet-server-sdk" Version="1.1.*" /> | ||
| </ItemGroup> | ||
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| <PropertyGroup> | ||
| <LangVersion>latest</LangVersion> | ||
| </PropertyGroup> | ||
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| </Project> |
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| using System; | ||
| using System.Threading.Tasks; | ||
| using io.harness.cfsdk.client.api; | ||
| using OpenFeature.Model; | ||
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| namespace OpenFeature.Contrib.Providers.Harness; | ||
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| /// <summary> | ||
| /// HarnessProvider is the .NET provider implementation for the Harness feature flag SDK | ||
| /// </summary> | ||
| public class Provider : FeatureProvider | ||
| { | ||
| private const string HarnessProviderName = "Harness Provider"; | ||
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| private readonly Metadata _metadata = new (HarnessProviderName); | ||
| private readonly ICfClient _client; | ||
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| /// <summary> | ||
| /// Constructor of the Harness provider. | ||
| /// </summary> | ||
| public Provider(ICfClient client) | ||
| { | ||
| _client = client; | ||
| } | ||
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| /// <inheritdoc/> | ||
| public override Metadata GetMetadata() | ||
| { | ||
| return this._metadata; | ||
| } | ||
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| /// <inheritdoc/> | ||
| public override Task<ResolutionDetails<bool>> ResolveBooleanValue(string flagKey, bool defaultValue, EvaluationContext context = null) | ||
| { | ||
| var result = _client.boolVariation(flagKey, HarnessAdapter.CreateTarget(context), defaultValue); | ||
| return Task.FromResult(HarnessAdapter.HarnessResponse(flagKey, result)); | ||
| } | ||
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| /// <inheritdoc/> | ||
| public override Task<ResolutionDetails<string>> ResolveStringValue(string flagKey, string defaultValue, EvaluationContext context = null) | ||
| { | ||
| var result = _client.stringVariation(flagKey, HarnessAdapter.CreateTarget(context), defaultValue); | ||
| return Task.FromResult(HarnessAdapter.HarnessResponse(flagKey, result)); | ||
| } | ||
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| /// <inheritdoc/> | ||
| public override Task<ResolutionDetails<int>> ResolveIntegerValue(string flagKey, int defaultValue, EvaluationContext context = null) | ||
| { | ||
| var result = _client.numberVariation(flagKey, HarnessAdapter.CreateTarget(context), defaultValue); | ||
| return Task.FromResult(HarnessAdapter.HarnessResponse(flagKey, Convert.ToInt32(result))); | ||
| } | ||
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| /// <inheritdoc/> | ||
| public override Task<ResolutionDetails<double>> ResolveDoubleValue(string flagKey, double defaultValue, EvaluationContext context = null) | ||
| { | ||
| var result = _client.numberVariation(flagKey, HarnessAdapter.CreateTarget(context), defaultValue); | ||
| return Task.FromResult(HarnessAdapter.HarnessResponse(flagKey, result)); | ||
| } | ||
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| /// <inheritdoc/> | ||
| public override Task<ResolutionDetails<Value>> ResolveStructureValue(string flagKey, Value defaultValue, EvaluationContext context = null) | ||
| { | ||
| // TODO need to implement this | ||
| return Task.FromResult(HarnessAdapter.HarnessResponse(flagKey, defaultValue)); | ||
| } | ||
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| } |