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feat: Add ConfigCat provider (open-feature#119)
Signed-off-by: Luiz Bon <luiz.bon@prospa.com>
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110 changes: 110 additions & 0 deletions
110
src/OpenFeature.Contrib.Providers.ConfigCat/ConfigCatProvider.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| using System; | ||
| using System.Threading.Tasks; | ||
| using ConfigCat.Client; | ||
| using ConfigCat.Client.Configuration; | ||
| using OpenFeature.Constant; | ||
| using OpenFeature.Error; | ||
| using OpenFeature.Model; | ||
|
|
||
| namespace OpenFeature.Contrib.ConfigCat | ||
| { | ||
| /// <summary> | ||
| /// ConfigCatProvider is the .NET provider implementation for the feature flag solution ConfigCat. | ||
| /// </summary> | ||
| public sealed class ConfigCatProvider : FeatureProvider | ||
| { | ||
| private const string Name = "ConfigCat Provider"; | ||
| internal readonly IConfigCatClient Client; | ||
|
|
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| /// <summary> | ||
| /// Creates new instance of <see cref="ConfigCatProvider"/> | ||
| /// </summary> | ||
| /// <param name="sdkKey">SDK Key to access the ConfigCat config.</param> | ||
| /// <param name="configBuilder">The action used to configure the client.</param> | ||
| /// <exception cref="ArgumentNullException"><paramref name="sdkKey"/> is <see langword="null"/>.</exception> | ||
| /// <exception cref="ArgumentException"><paramref name="sdkKey"/> is an empty string or in an invalid format.</exception> | ||
| public ConfigCatProvider(string sdkKey, Action<ConfigCatClientOptions> configBuilder = null) | ||
| { | ||
| Client = ConfigCatClient.Get(sdkKey, configBuilder); | ||
| } | ||
|
|
||
| /// <inheritdoc/> | ||
| public override Metadata GetMetadata() | ||
| { | ||
| return new Metadata(Name); | ||
| } | ||
|
|
||
| /// <inheritdoc/> | ||
| public override Task<ResolutionDetails<bool>> ResolveBooleanValue(string flagKey, bool defaultValue, EvaluationContext context = null) | ||
| { | ||
| return ResolveFlag(flagKey, context, defaultValue); | ||
| } | ||
|
|
||
| /// <inheritdoc/> | ||
| public override Task<ResolutionDetails<string>> ResolveStringValue(string flagKey, string defaultValue, EvaluationContext context = null) | ||
| { | ||
| return ResolveFlag(flagKey, context, defaultValue); | ||
| } | ||
|
|
||
| /// <inheritdoc/> | ||
| public override Task<ResolutionDetails<int>> ResolveIntegerValue(string flagKey, int defaultValue, EvaluationContext context = null) | ||
| { | ||
| return ResolveFlag(flagKey, context, defaultValue); | ||
| } | ||
|
|
||
| /// <inheritdoc/> | ||
| public override Task<ResolutionDetails<double>> ResolveDoubleValue(string flagKey, double defaultValue, EvaluationContext context = null) | ||
| { | ||
| return ResolveFlag(flagKey, context, defaultValue); | ||
| } | ||
|
|
||
| /// <inheritdoc/> | ||
| public override async Task<ResolutionDetails<Value>> ResolveStructureValue(string flagKey, Value defaultValue, EvaluationContext context = null) | ||
| { | ||
| var user = context?.BuildUser(); | ||
| var result = await Client.GetValueDetailsAsync(flagKey, defaultValue?.AsObject, user); | ||
| var returnValue = result.IsDefaultValue ? defaultValue : new Value(result.Value); | ||
| var details = new ResolutionDetails<Value>(flagKey, returnValue, ParseErrorType(result.ErrorMessage), errorMessage: result.ErrorMessage, variant: result.VariationId); | ||
| if (details.ErrorType == ErrorType.None) | ||
| { | ||
| return details; | ||
| } | ||
|
|
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| throw new FeatureProviderException(details.ErrorType, details.ErrorMessage); | ||
| } | ||
|
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| private async Task<ResolutionDetails<T>> ResolveFlag<T>(string flagKey, EvaluationContext context, T defaultValue) | ||
| { | ||
| var user = context?.BuildUser(); | ||
| var result = await Client.GetValueDetailsAsync(flagKey, defaultValue, user); | ||
| var details = new ResolutionDetails<T>(flagKey, result.Value, ParseErrorType(result.ErrorMessage), errorMessage: result.ErrorMessage, variant: result.VariationId); | ||
| if (details.ErrorType == ErrorType.None) | ||
| { | ||
| return details; | ||
| } | ||
|
|
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| throw new FeatureProviderException(details.ErrorType, details.ErrorMessage); | ||
| } | ||
|
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| private static ErrorType ParseErrorType(string errorMessage) | ||
| { | ||
| if (string.IsNullOrEmpty(errorMessage)) | ||
| { | ||
| return ErrorType.None; | ||
| } | ||
| if (errorMessage.Contains("Config JSON is not present")) | ||
| { | ||
| return ErrorType.ParseError; | ||
| } | ||
| if (errorMessage.Contains("the key was not found in config JSON")) | ||
| { | ||
| return ErrorType.FlagNotFound; | ||
| } | ||
| if (errorMessage.Contains("The type of a setting must match the type of the specified default value")) | ||
| { | ||
| return ErrorType.TypeMismatch; | ||
| } | ||
| return ErrorType.General; | ||
| } | ||
| } | ||
| } |
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src/OpenFeature.Contrib.Providers.ConfigCat/OpenFeature.Contrib.Providers.ConfigCat.csproj
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| @@ -0,0 +1,23 @@ | ||
| <Project Sdk="Microsoft.NET.Sdk"> | ||
|
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| <PropertyGroup> | ||
| <PackageId>OpenFeature.Contrib.Providers.ConfigCat</PackageId> | ||
| <VersionNumber>0.0.1</VersionNumber> <!--x-release-please-version --> | ||
| <Version>$(VersionNumber)</Version> | ||
| <AssemblyVersion>$(VersionNumber)</AssemblyVersion> | ||
| <FileVersion>$(VersionNumber)</FileVersion> | ||
| <Description>ConfigCat provider for .NET</Description> | ||
| <PackageProjectUrl>https://openfeature.dev</PackageProjectUrl> | ||
| <RepositoryUrl>https://github.com/open-feature/dotnet-sdk-contrib</RepositoryUrl> | ||
| <Authors>Luiz Bon</Authors> | ||
| </PropertyGroup> | ||
| <ItemGroup> | ||
| <!-- make the internal methods visble to our test project --> | ||
| <AssemblyAttribute Include="System.Runtime.CompilerServices.InternalsVisibleTo"> | ||
| <_Parameter1>$(MSBuildProjectName).Test</_Parameter1> | ||
| </AssemblyAttribute> | ||
| </ItemGroup> | ||
| <ItemGroup> | ||
| <PackageReference Include="ConfigCat.Client" Version="[9,)"/> | ||
| </ItemGroup> | ||
| </Project> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| # ConfigCat Feature Flag .NET Provider | ||
|
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| The ConfigCat Flag provider allows you to connect to your ConfigCat instance. | ||
|
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| # .Net SDK usage | ||
|
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| ## Install dependencies | ||
|
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| The first things we will do is install the **Open Feature SDK** and the **ConfigCat Feature Flag provider**. | ||
|
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| ### .NET Cli | ||
| ```shell | ||
| dotnet add package OpenFeature.Contrib.Providers.ConfigCat | ||
| ``` | ||
| ### Package Manager | ||
|
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| ```shell | ||
| NuGet\Install-Package OpenFeature.Contrib.Providers.ConfigCat | ||
| ``` | ||
| ### Package Reference | ||
|
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| ```xml | ||
| <PackageReference Include="OpenFeature.Contrib.Providers.ConfigCat" /> | ||
| ``` | ||
| ### Packet cli | ||
|
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| ```shell | ||
| paket add OpenFeature.Contrib.Providers.ConfigCat | ||
| ``` | ||
|
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| ### Cake | ||
|
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| ```shell | ||
| // Install OpenFeature.Contrib.Providers.ConfigCat as a Cake Addin | ||
| #addin nuget:?package=OpenFeature.Contrib.Providers.ConfigCat | ||
|
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| // Install OpenFeature.Contrib.Providers.ConfigCat as a Cake Tool | ||
| #tool nuget:?package=OpenFeature.Contrib.Providers.ConfigCat | ||
| ``` | ||
|
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| ## Using the ConfigCat Provider with the OpenFeature SDK | ||
|
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| The following example shows how to use the ConfigCat provider with the OpenFeature SDK. | ||
|
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| ```csharp | ||
| using OpenFeature.Contrib.Providers.ConfigCat; | ||
|
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| namespace OpenFeatureTestApp | ||
| { | ||
| class Hello { | ||
| static void Main(string[] args) { | ||
| var configCatProvider = new ConfigCatProvider("#YOUR-SDK-KEY#"); | ||
|
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| // Set the configCatProvider as the provider for the OpenFeature SDK | ||
| OpenFeature.Api.Instance.SetProvider(configCatProvider); | ||
|
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| var client = OpenFeature.Api.Instance.GetClient(); | ||
|
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| var val = client.GetBooleanValue("isMyAwesomeFeatureEnabled", false); | ||
|
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| if(isMyAwesomeFeatureEnabled) | ||
| { | ||
| doTheNewThing(); | ||
| } | ||
| else | ||
| { | ||
| doTheOldThing(); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| ``` | ||
|
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| ### Customizing the ConfigCat Provider | ||
|
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| The ConfigCat provider can be customized by passing a `ConfigCatClientOptions` object to the constructor. | ||
|
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| ```csharp | ||
| var configCatOptions = new ConfigCatClientOptions | ||
| { | ||
| PollingMode = PollingModes.ManualPoll; | ||
| Logger = new ConsoleLogger(LogLevel.Info); | ||
| }; | ||
|
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| var configCatProvider = new ConfigCatProvider("#YOUR-SDK-KEY#", configCatOptions); | ||
| ``` | ||
|
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| For a full list of options see the [ConfigCat documentation](https://configcat.com/docs/sdk-reference/dotnet/). | ||
|
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| ## EvaluationContext and ConfigCat User relationship | ||
|
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| ConfigCat has the concept of Users where you can evaluate a flag based on properties. The OpenFeature SDK has the concept of an EvaluationContext which is a dictionary of string keys and values. The ConfigCat provider will map the EvaluationContext to a ConfigCat User. | ||
|
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| The ConfigCat User has a few pre-defined parameters that can be used to evaluate a flag. These are: | ||
|
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| | Parameter | Description | | ||
| |-----------|---------------------------------------------------------------------------------------------------------------------------------| | ||
| | `Id` | *REQUIRED*. Unique identifier of a user in your application. Can be any `string` value, even an email address. | | ||
| | `Email` | Optional parameter for easier targeting rule definitions. | | ||
| | `Country` | Optional parameter for easier targeting rule definitions. | | ||
| | `Custom` | Optional dictionary for custom attributes of a user for advanced targeting rule definitions. E.g. User role, Subscription type. | | ||
|
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| Since EvaluationContext is a simple dictionary, the provider will try to match the keys to the ConfigCat User parameters following the table below in a case-insensitive manner. | ||
|
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| | EvaluationContext Key | ConfigCat User Parameter | | ||
| |-----------------------|--------------------------| | ||
| | `id` | `Id` | | ||
| | `identifier` | `Id` | | ||
| | `email` | `Email` | | ||
| | `country` | `Country` | |
51 changes: 51 additions & 0 deletions
51
src/OpenFeature.Contrib.Providers.ConfigCat/UserBuilder.cs
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|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Linq; | ||
| using ConfigCat.Client; | ||
| using OpenFeature.Model; | ||
|
|
||
| namespace OpenFeature.Contrib.ConfigCat | ||
| { | ||
| internal static class UserBuilder | ||
| { | ||
| private static readonly string[] PossibleUserIds = { "ID", "IDENTIFIER" }; | ||
|
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| internal static User BuildUser(this EvaluationContext context) | ||
| { | ||
| if (context == null) | ||
| { | ||
| return null; | ||
| } | ||
|
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| var user = context.TryGetValuesInsensitive(PossibleUserIds, out var pair) | ||
| ? new User(pair.Value.AsString) | ||
| : new User(Guid.NewGuid().ToString()); | ||
|
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| foreach (var value in context) | ||
| { | ||
| switch (value.Key.ToUpperInvariant()) | ||
| { | ||
| case "EMAIL": | ||
| user.Email = value.Value.AsString; | ||
| continue; | ||
| case "COUNTRY": | ||
| user.Country = value.Value.AsString; | ||
| continue; | ||
| default: | ||
| user.Custom.Add(value.Key, value.Value.AsString); | ||
| continue; | ||
| } | ||
| } | ||
|
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| return user; | ||
| } | ||
|
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| private static bool TryGetValuesInsensitive(this EvaluationContext context, string[] keys, | ||
| out KeyValuePair<string, Value> pair) | ||
| { | ||
| pair = context.AsDictionary().FirstOrDefault(x => keys.Contains(x.Key.ToUpperInvariant())); | ||
|
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| return pair.Key != null; | ||
| } | ||
| } | ||
| } |
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