diff --git a/.release-please-manifest.json b/.release-please-manifest.json index dd8fde77..895bf0e3 100644 --- a/.release-please-manifest.json +++ b/.release-please-manifest.json @@ -1,3 +1,3 @@ { - ".": "1.5.0" + ".": "2.0.0" } diff --git a/CHANGELOG.md b/CHANGELOG.md index 929d2c66..a7ad79dd 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -1,5 +1,47 @@ # Changelog +## [2.0.0](https://github.com/open-feature/dotnet-sdk/compare/v1.5.0...v2.0.0) (2024-07-03) + + +### โš  BREAKING CHANGES + +* internally maintain provider status ([#276](https://github.com/open-feature/dotnet-sdk/issues/276)) +* add CancellationTokens, ValueTasks hooks ([#268](https://github.com/open-feature/dotnet-sdk/issues/268)) +* Use same type for flag metadata and event metadata ([#241](https://github.com/open-feature/dotnet-sdk/issues/241)) +* Enable nullable reference types ([#253](https://github.com/open-feature/dotnet-sdk/issues/253)) + +### ๐Ÿ› Bug Fixes + +* Add missing error message when an error occurred ([#256](https://github.com/open-feature/dotnet-sdk/issues/256)) ([949d53c](https://github.com/open-feature/dotnet-sdk/commit/949d53cada68bee8e80d113357fa6df8d425d3c1)) + + +### โœจ New Features + +* add CancellationTokens, ValueTasks hooks ([#268](https://github.com/open-feature/dotnet-sdk/issues/268)) ([33154d2](https://github.com/open-feature/dotnet-sdk/commit/33154d2ed6b0b27f4a86a5fbad440a784a89c881)) +* internally maintain provider status ([#276](https://github.com/open-feature/dotnet-sdk/issues/276)) ([63faa84](https://github.com/open-feature/dotnet-sdk/commit/63faa8440cd650b0bd6c3ec009ad9bd78bc31f32)) +* Use same type for flag metadata and event metadata ([#241](https://github.com/open-feature/dotnet-sdk/issues/241)) ([ac7d7de](https://github.com/open-feature/dotnet-sdk/commit/ac7d7debf50cef08668bcd9457d3f830b8718806)) + + +### ๐Ÿงน Chore + +* **deps:** Project file cleanup and remove unnecessary dependencies ([#251](https://github.com/open-feature/dotnet-sdk/issues/251)) ([79def47](https://github.com/open-feature/dotnet-sdk/commit/79def47106b19b316b691fa195f7160ddcfb9a41)) +* **deps:** update actions/upload-artifact action to v4.3.3 ([#263](https://github.com/open-feature/dotnet-sdk/issues/263)) ([7718649](https://github.com/open-feature/dotnet-sdk/commit/77186495cd3d567b0aabd418f23a65567656b54d)) +* **deps:** update codecov/codecov-action action to v4 ([#227](https://github.com/open-feature/dotnet-sdk/issues/227)) ([11a0333](https://github.com/open-feature/dotnet-sdk/commit/11a03332726f07dd0327d222e6bd6e1843db460c)) +* **deps:** update codecov/codecov-action action to v4.3.1 ([#267](https://github.com/open-feature/dotnet-sdk/issues/267)) ([ff9df59](https://github.com/open-feature/dotnet-sdk/commit/ff9df593400f92c016eee1a45bd7097da008d4dc)) +* **deps:** update codecov/codecov-action action to v4.5.0 ([#272](https://github.com/open-feature/dotnet-sdk/issues/272)) ([281295d](https://github.com/open-feature/dotnet-sdk/commit/281295d2999e4d36c5a2078cbfdfe5e59f4652b2)) +* **deps:** update dependency coverlet.collector to v6.0.2 ([#247](https://github.com/open-feature/dotnet-sdk/issues/247)) ([ab34c16](https://github.com/open-feature/dotnet-sdk/commit/ab34c16b513ddbd0a53e925baaccd088163fbcc8)) +* **deps:** update dependency coverlet.msbuild to v6.0.2 ([#239](https://github.com/open-feature/dotnet-sdk/issues/239)) ([e654222](https://github.com/open-feature/dotnet-sdk/commit/e6542222827cc25cd5a1acc5af47ce55149c0623)) +* **deps:** update dependency dotnet-sdk to v8.0.204 ([#261](https://github.com/open-feature/dotnet-sdk/issues/261)) ([8f82645](https://github.com/open-feature/dotnet-sdk/commit/8f8264520814a42b7ed2af8f70340e7673259b6f)) +* **deps:** update dependency dotnet-sdk to v8.0.301 ([#271](https://github.com/open-feature/dotnet-sdk/issues/271)) ([acd0385](https://github.com/open-feature/dotnet-sdk/commit/acd0385641e114a16d0ee56e3a143baa7d3c0535)) +* **deps:** update dependency githubactionstestlogger to v2.4.1 ([#274](https://github.com/open-feature/dotnet-sdk/issues/274)) ([46c2b15](https://github.com/open-feature/dotnet-sdk/commit/46c2b153c848bd3a500b828ddb89bd3b07753bf1)) +* **deps:** update dependency microsoft.net.test.sdk to v17.10.0 ([#273](https://github.com/open-feature/dotnet-sdk/issues/273)) ([581ff81](https://github.com/open-feature/dotnet-sdk/commit/581ff81c7b1840c34840229bf20444c528c64cc6)) +* **deps:** update dotnet monorepo ([#218](https://github.com/open-feature/dotnet-sdk/issues/218)) ([bc8301d](https://github.com/open-feature/dotnet-sdk/commit/bc8301d1c54e0b48ede3235877d969f28d61fb29)) +* **deps:** update xunit-dotnet monorepo ([#262](https://github.com/open-feature/dotnet-sdk/issues/262)) ([43f14cc](https://github.com/open-feature/dotnet-sdk/commit/43f14cca072372ecacec89a949c85f763c1ee7b4)) +* **deps:** update xunit-dotnet monorepo to v2.8.1 ([#266](https://github.com/open-feature/dotnet-sdk/issues/266)) ([a7b6d85](https://github.com/open-feature/dotnet-sdk/commit/a7b6d8561716763f324325a8803b913c4d69c044)) +* Enable nullable reference types ([#253](https://github.com/open-feature/dotnet-sdk/issues/253)) ([5a5312c](https://github.com/open-feature/dotnet-sdk/commit/5a5312cc082ccd880b65165135e05b4f3b035df7)) +* prompt 2.0 ([9b9c3fd](https://github.com/open-feature/dotnet-sdk/commit/9b9c3fd09c27b191104d7ceaa726b6edd71fcd06)) +* Support for determining spec support for the repo ([#270](https://github.com/open-feature/dotnet-sdk/issues/270)) ([67a1a0a](https://github.com/open-feature/dotnet-sdk/commit/67a1a0aea95ee943976990b1d1782e4061300b50)) + ## [1.5.0](https://github.com/open-feature/dotnet-sdk/compare/v1.4.1...v1.5.0) (2024-03-12) diff --git a/README.md b/README.md index 6844915f..fe8096fd 100644 --- a/README.md +++ b/README.md @@ -1,320 +1,320 @@ - - - -![OpenFeature Dark Logo](https://raw.githubusercontent.com/open-feature/community/0e23508c163a6a1ac8c0ced3e4bd78faafe627c7/assets/logo/horizontal/black/openfeature-horizontal-black.svg) - -## .NET SDK - - - -[![Specification](https://img.shields.io/static/v1?label=specification&message=v0.7.0&color=yellow&style=for-the-badge)](https://github.com/open-feature/spec/releases/tag/v0.7.0) -[ - ![Release](https://img.shields.io/static/v1?label=release&message=v1.5.0&color=blue&style=for-the-badge) -](https://github.com/open-feature/dotnet-sdk/releases/tag/v1.5.0) - -[![Slack](https://img.shields.io/badge/slack-%40cncf%2Fopenfeature-brightgreen?style=flat&logo=slack)](https://cloud-native.slack.com/archives/C0344AANLA1) -[![Codecov](https://codecov.io/gh/open-feature/dotnet-sdk/branch/main/graph/badge.svg?token=MONAVJBXUJ)](https://codecov.io/gh/open-feature/dotnet-sdk) -[![NuGet](https://img.shields.io/nuget/vpre/OpenFeature)](https://www.nuget.org/packages/OpenFeature) -[![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/6250/badge)](https://www.bestpractices.dev/en/projects/6250) - - -[OpenFeature](https://openfeature.dev) is an open specification that provides a vendor-agnostic, community-driven API for feature flagging that works with your favorite feature flag management tool or in-house solution. - - - -## ๐Ÿš€ Quick start - -### Requirements - -- .NET 6+ -- .NET Core 6+ -- .NET Framework 4.6.2+ - -Note that the packages will aim to support all current .NET versions. Refer to the currently supported versions [.NET](https://dotnet.microsoft.com/download/dotnet) and [.NET Framework](https://dotnet.microsoft.com/download/dotnet-framework) excluding .NET Framework 3.5 - -### Install - -Use the following to initialize your project: - -```sh -dotnet new console -``` - -and install OpenFeature: - -```sh -dotnet add package OpenFeature -``` - -### Usage - -```csharp -public async Task Example() -{ - // Register your feature flag provider - await Api.Instance.SetProviderAsync(new InMemoryProvider()); - - // Create a new client - FeatureClient client = Api.Instance.GetClient(); - - // Evaluate your feature flag - bool v2Enabled = await client.GetBooleanValueAsync("v2_enabled", false); - - if ( v2Enabled ) - { - //Do some work - } -} -``` - -## ๐ŸŒŸ Features - -| Status | Features | Description | -| ------ | ------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------- | -| โœ… | [Providers](#providers) | Integrate with a commercial, open source, or in-house feature management tool. | -| โœ… | [Targeting](#targeting) | Contextually-aware flag evaluation using [evaluation context](https://openfeature.dev/docs/reference/concepts/evaluation-context). | -| โœ… | [Hooks](#hooks) | Add functionality to various stages of the flag evaluation life-cycle. | -| โœ… | [Logging](#logging) | Integrate with popular logging packages. | -| โœ… | [Named clients](#named-clients) | Utilize multiple providers in a single application. | -| โœ… | [Eventing](#eventing) | React to state changes in the provider or flag management system. | -| โœ… | [Shutdown](#shutdown) | Gracefully clean up a provider during application shutdown. | -| โœ… | [Extending](#extending) | Extend OpenFeature with custom providers and hooks. | - -> Implemented: โœ… | In-progress: โš ๏ธ | Not implemented yet: โŒ - -### Providers - -[Providers](https://openfeature.dev/docs/reference/concepts/provider) are an abstraction between a flag management system and the OpenFeature SDK. -Here is [a complete list of available providers](https://openfeature.dev/ecosystem?instant_search%5BrefinementList%5D%5Btype%5D%5B0%5D=Provider&instant_search%5BrefinementList%5D%5Btechnology%5D%5B0%5D=.NET). - -If the provider you're looking for hasn't been created yet, see the [develop a provider](#develop-a-provider) section to learn how to build it yourself. - -Once you've added a provider as a dependency, it can be registered with OpenFeature like this: - -```csharp -await Api.Instance.SetProviderAsync(new MyProvider()); -``` - -In some situations, it may be beneficial to register multiple providers in the same application. -This is possible using [named clients](#named-clients), which is covered in more detail below. - -### Targeting - -Sometimes, the value of a flag must consider some dynamic criteria about the application or user such as the user's location, IP, email address, or the server's location. -In OpenFeature, we refer to this as [targeting](https://openfeature.dev/specification/glossary#targeting). -If the flag management system you're using supports targeting, you can provide the input data using the [evaluation context](https://openfeature.dev/docs/reference/concepts/evaluation-context). - -```csharp -// set a value to the global context -EvaluationContextBuilder builder = EvaluationContext.Builder(); -builder.Set("region", "us-east-1"); -EvaluationContext apiCtx = builder.Build(); -Api.Instance.SetContext(apiCtx); - -// set a value to the client context -builder = EvaluationContext.Builder(); -builder.Set("region", "us-east-1"); -EvaluationContext clientCtx = builder.Build(); -var client = Api.Instance.GetClient(); -client.SetContext(clientCtx); - -// set a value to the invocation context -builder = EvaluationContext.Builder(); -builder.Set("region", "us-east-1"); -EvaluationContext reqCtx = builder.Build(); - -bool flagValue = await client.GetBooleanValuAsync("some-flag", false, reqCtx); - -``` - -### Hooks - -[Hooks](https://openfeature.dev/docs/reference/concepts/hooks) allow for custom logic to be added at well-defined points of the flag evaluation life-cycle. -Look [here](https://openfeature.dev/ecosystem/?instant_search%5BrefinementList%5D%5Btype%5D%5B0%5D=Hook&instant_search%5BrefinementList%5D%5Bcategory%5D%5B0%5D=Server-side&instant_search%5BrefinementList%5D%5Btechnology%5D%5B0%5D=.NET) for a complete list of available hooks. -If the hook you're looking for hasn't been created yet, see the [develop a hook](#develop-a-hook) section to learn how to build it yourself. - -Once you've added a hook as a dependency, it can be registered at the global, client, or flag invocation level. - -```csharp -// add a hook globally, to run on all evaluations -Api.Instance.AddHooks(new ExampleGlobalHook()); - -// add a hook on this client, to run on all evaluations made by this client -var client = Api.Instance.GetClient(); -client.AddHooks(new ExampleClientHook()); - -// add a hook for this evaluation only -var value = await client.GetBooleanValueAsync("boolFlag", false, context, new FlagEvaluationOptions(new ExampleInvocationHook())); -``` - -### Logging - -The .NET SDK uses Microsoft.Extensions.Logging. See the [manual](https://learn.microsoft.com/en-us/dotnet/core/extensions/logging?tabs=command-line) for complete documentation. - -### Named clients - -Clients can be given a name. -A name is a logical identifier that can be used to associate clients with a particular provider. -If a name has no associated provider, the global provider is used. - -```csharp -// registering the default provider -await Api.Instance.SetProviderAsync(new LocalProvider()); - -// registering a named provider -await Api.Instance.SetProviderAsync("clientForCache", new CachedProvider()); - -// a client backed by default provider -FeatureClient clientDefault = Api.Instance.GetClient(); - -// a client backed by CachedProvider -FeatureClient clientNamed = Api.Instance.GetClient("clientForCache"); - -``` - -### Eventing - -Events allow you to react to state changes in the provider or underlying flag management system, such as flag definition changes, -provider readiness, or error conditions. -Initialization events (`PROVIDER_READY` on success, `PROVIDER_ERROR` on failure) are dispatched for every provider. -Some providers support additional events, such as `PROVIDER_CONFIGURATION_CHANGED`. - -Please refer to the documentation of the provider you're using to see what events are supported. - -Example usage of an Event handler: - -```csharp -public static void EventHandler(ProviderEventPayload eventDetails) -{ - Console.WriteLine(eventDetails.Type); -} -``` - -```csharp -EventHandlerDelegate callback = EventHandler; -// add an implementation of the EventHandlerDelegate for the PROVIDER_READY event -Api.Instance.AddHandler(ProviderEventTypes.ProviderReady, callback); -``` - -It is also possible to register an event handler for a specific client, as in the following example: - -```csharp -EventHandlerDelegate callback = EventHandler; - -var myClient = Api.Instance.GetClient("my-client"); - -var provider = new ExampleProvider(); -await Api.Instance.SetProviderAsync(myClient.GetMetadata().Name, provider); - -myClient.AddHandler(ProviderEventTypes.ProviderReady, callback); -``` - -### Shutdown - -The OpenFeature API provides a close function to perform a cleanup of all registered providers. This should only be called when your application is in the process of shutting down. - -```csharp -// Shut down all providers -await Api.Instance.ShutdownAsync(); -``` - -## Extending - -### Develop a provider - -To develop a provider, you need to create a new project and include the OpenFeature SDK as a dependency. -This can be a new repository or included in [the existing contrib repository](https://github.com/open-feature/dotnet-sdk-contrib) available under the OpenFeature organization. -Youโ€™ll then need to write the provider by implementing the `FeatureProvider` interface exported by the OpenFeature SDK. - -```csharp -public class MyProvider : FeatureProvider -{ - public override Metadata GetMetadata() - { - return new Metadata("My Provider"); - } - - public override Task> ResolveBooleanValueAsync(string flagKey, bool defaultValue, EvaluationContext? context = null, CancellationToken cancellationToken = default) - { - // resolve a boolean flag value - } - - public override Task> ResolveStringValueAsync(string flagKey, string defaultValue, EvaluationContext? context = null, CancellationToken cancellationToken = default) - { - // resolve a string flag value - } - - public override Task> ResolveIntegerValueAsync(string flagKey, int defaultValue, EvaluationContext context = null) - { - // resolve an int flag value - } - - public override Task> ResolveDoubleValueAsync(string flagKey, double defaultValue, EvaluationContext? context = null, CancellationToken cancellationToken = default) - { - // resolve a double flag value - } - - public override Task> ResolveStructureValueAsync(string flagKey, Value defaultValue, EvaluationContext? context = null, CancellationToken cancellationToken = default) - { - // resolve an object flag value - } -} -``` - -### Develop a hook - -To develop a hook, you need to create a new project and include the OpenFeature SDK as a dependency. -This can be a new repository or included in [the existing contrib repository](https://github.com/open-feature/dotnet-sdk-contrib) available under the OpenFeature organization. -Implement your own hook by conforming to the `Hook interface`. -To satisfy the interface, all methods (`Before`/`After`/`Finally`/`Error`) need to be defined. - -```csharp -public class MyHook : Hook -{ - public ValueTask BeforeAsync(HookContext context, - IReadOnlyDictionary hints = null) - { - // code to run before flag evaluation - } - - public ValueTask AfterAsync(HookContext context, FlagEvaluationDetails details, - IReadOnlyDictionary hints = null) - { - // code to run after successful flag evaluation - } - - public ValueTask ErrorAsync(HookContext context, Exception error, - IReadOnlyDictionary hints = null) - { - // code to run if there's an error during before hooks or during flag evaluation - } - - public ValueTask FinallyAsync(HookContext context, IReadOnlyDictionary hints = null) - { - // code to run after all other stages, regardless of success/failure - } -} -``` - -Built a new hook? [Let us know](https://github.com/open-feature/openfeature.dev/issues/new?assignees=&labels=hook&projects=&template=document-hook.yaml&title=%5BHook%5D%3A+) so we can add it to the docs! - - -## โญ๏ธ Support the project - -- Give this repo a โญ๏ธ! -- Follow us on social media: - - Twitter: [@openfeature](https://twitter.com/openfeature) - - LinkedIn: [OpenFeature](https://www.linkedin.com/company/openfeature/) -- Join us on [Slack](https://cloud-native.slack.com/archives/C0344AANLA1) -- For more information, check out our [community page](https://openfeature.dev/community/) - -## ๐Ÿค Contributing - -Interested in contributing? Great, we'd love your help! To get started, take a look at the [CONTRIBUTING](CONTRIBUTING.md) guide. - -### Thanks to everyone who has already contributed - -[![Contrib Rocks](https://contrib.rocks/image?repo=open-feature/dotnet-sdk)](https://github.com/open-feature/dotnet-sdk/graphs/contributors) - -Made with [contrib.rocks](https://contrib.rocks). - + + + +![OpenFeature Dark Logo](https://raw.githubusercontent.com/open-feature/community/0e23508c163a6a1ac8c0ced3e4bd78faafe627c7/assets/logo/horizontal/black/openfeature-horizontal-black.svg) + +## .NET SDK + + + +[![Specification](https://img.shields.io/static/v1?label=specification&message=v0.7.0&color=yellow&style=for-the-badge)](https://github.com/open-feature/spec/releases/tag/v0.7.0) +[ + ![Release](https://img.shields.io/static/v1?label=release&message=v2.0.0&color=blue&style=for-the-badge) +](https://github.com/open-feature/dotnet-sdk/releases/tag/v2.0.0) + +[![Slack](https://img.shields.io/badge/slack-%40cncf%2Fopenfeature-brightgreen?style=flat&logo=slack)](https://cloud-native.slack.com/archives/C0344AANLA1) +[![Codecov](https://codecov.io/gh/open-feature/dotnet-sdk/branch/main/graph/badge.svg?token=MONAVJBXUJ)](https://codecov.io/gh/open-feature/dotnet-sdk) +[![NuGet](https://img.shields.io/nuget/vpre/OpenFeature)](https://www.nuget.org/packages/OpenFeature) +[![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/6250/badge)](https://www.bestpractices.dev/en/projects/6250) + + +[OpenFeature](https://openfeature.dev) is an open specification that provides a vendor-agnostic, community-driven API for feature flagging that works with your favorite feature flag management tool or in-house solution. + + + +## ๐Ÿš€ Quick start + +### Requirements + +- .NET 6+ +- .NET Core 6+ +- .NET Framework 4.6.2+ + +Note that the packages will aim to support all current .NET versions. Refer to the currently supported versions [.NET](https://dotnet.microsoft.com/download/dotnet) and [.NET Framework](https://dotnet.microsoft.com/download/dotnet-framework) excluding .NET Framework 3.5 + +### Install + +Use the following to initialize your project: + +```sh +dotnet new console +``` + +and install OpenFeature: + +```sh +dotnet add package OpenFeature +``` + +### Usage + +```csharp +public async Task Example() +{ + // Register your feature flag provider + await Api.Instance.SetProviderAsync(new InMemoryProvider()); + + // Create a new client + FeatureClient client = Api.Instance.GetClient(); + + // Evaluate your feature flag + bool v2Enabled = await client.GetBooleanValueAsync("v2_enabled", false); + + if ( v2Enabled ) + { + //Do some work + } +} +``` + +## ๐ŸŒŸ Features + +| Status | Features | Description | +| ------ | ------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------- | +| โœ… | [Providers](#providers) | Integrate with a commercial, open source, or in-house feature management tool. | +| โœ… | [Targeting](#targeting) | Contextually-aware flag evaluation using [evaluation context](https://openfeature.dev/docs/reference/concepts/evaluation-context). | +| โœ… | [Hooks](#hooks) | Add functionality to various stages of the flag evaluation life-cycle. | +| โœ… | [Logging](#logging) | Integrate with popular logging packages. | +| โœ… | [Named clients](#named-clients) | Utilize multiple providers in a single application. | +| โœ… | [Eventing](#eventing) | React to state changes in the provider or flag management system. | +| โœ… | [Shutdown](#shutdown) | Gracefully clean up a provider during application shutdown. | +| โœ… | [Extending](#extending) | Extend OpenFeature with custom providers and hooks. | + +> Implemented: โœ… | In-progress: โš ๏ธ | Not implemented yet: โŒ + +### Providers + +[Providers](https://openfeature.dev/docs/reference/concepts/provider) are an abstraction between a flag management system and the OpenFeature SDK. +Here is [a complete list of available providers](https://openfeature.dev/ecosystem?instant_search%5BrefinementList%5D%5Btype%5D%5B0%5D=Provider&instant_search%5BrefinementList%5D%5Btechnology%5D%5B0%5D=.NET). + +If the provider you're looking for hasn't been created yet, see the [develop a provider](#develop-a-provider) section to learn how to build it yourself. + +Once you've added a provider as a dependency, it can be registered with OpenFeature like this: + +```csharp +await Api.Instance.SetProviderAsync(new MyProvider()); +``` + +In some situations, it may be beneficial to register multiple providers in the same application. +This is possible using [named clients](#named-clients), which is covered in more detail below. + +### Targeting + +Sometimes, the value of a flag must consider some dynamic criteria about the application or user such as the user's location, IP, email address, or the server's location. +In OpenFeature, we refer to this as [targeting](https://openfeature.dev/specification/glossary#targeting). +If the flag management system you're using supports targeting, you can provide the input data using the [evaluation context](https://openfeature.dev/docs/reference/concepts/evaluation-context). + +```csharp +// set a value to the global context +EvaluationContextBuilder builder = EvaluationContext.Builder(); +builder.Set("region", "us-east-1"); +EvaluationContext apiCtx = builder.Build(); +Api.Instance.SetContext(apiCtx); + +// set a value to the client context +builder = EvaluationContext.Builder(); +builder.Set("region", "us-east-1"); +EvaluationContext clientCtx = builder.Build(); +var client = Api.Instance.GetClient(); +client.SetContext(clientCtx); + +// set a value to the invocation context +builder = EvaluationContext.Builder(); +builder.Set("region", "us-east-1"); +EvaluationContext reqCtx = builder.Build(); + +bool flagValue = await client.GetBooleanValuAsync("some-flag", false, reqCtx); + +``` + +### Hooks + +[Hooks](https://openfeature.dev/docs/reference/concepts/hooks) allow for custom logic to be added at well-defined points of the flag evaluation life-cycle. +Look [here](https://openfeature.dev/ecosystem/?instant_search%5BrefinementList%5D%5Btype%5D%5B0%5D=Hook&instant_search%5BrefinementList%5D%5Bcategory%5D%5B0%5D=Server-side&instant_search%5BrefinementList%5D%5Btechnology%5D%5B0%5D=.NET) for a complete list of available hooks. +If the hook you're looking for hasn't been created yet, see the [develop a hook](#develop-a-hook) section to learn how to build it yourself. + +Once you've added a hook as a dependency, it can be registered at the global, client, or flag invocation level. + +```csharp +// add a hook globally, to run on all evaluations +Api.Instance.AddHooks(new ExampleGlobalHook()); + +// add a hook on this client, to run on all evaluations made by this client +var client = Api.Instance.GetClient(); +client.AddHooks(new ExampleClientHook()); + +// add a hook for this evaluation only +var value = await client.GetBooleanValueAsync("boolFlag", false, context, new FlagEvaluationOptions(new ExampleInvocationHook())); +``` + +### Logging + +The .NET SDK uses Microsoft.Extensions.Logging. See the [manual](https://learn.microsoft.com/en-us/dotnet/core/extensions/logging?tabs=command-line) for complete documentation. + +### Named clients + +Clients can be given a name. +A name is a logical identifier that can be used to associate clients with a particular provider. +If a name has no associated provider, the global provider is used. + +```csharp +// registering the default provider +await Api.Instance.SetProviderAsync(new LocalProvider()); + +// registering a named provider +await Api.Instance.SetProviderAsync("clientForCache", new CachedProvider()); + +// a client backed by default provider +FeatureClient clientDefault = Api.Instance.GetClient(); + +// a client backed by CachedProvider +FeatureClient clientNamed = Api.Instance.GetClient("clientForCache"); + +``` + +### Eventing + +Events allow you to react to state changes in the provider or underlying flag management system, such as flag definition changes, +provider readiness, or error conditions. +Initialization events (`PROVIDER_READY` on success, `PROVIDER_ERROR` on failure) are dispatched for every provider. +Some providers support additional events, such as `PROVIDER_CONFIGURATION_CHANGED`. + +Please refer to the documentation of the provider you're using to see what events are supported. + +Example usage of an Event handler: + +```csharp +public static void EventHandler(ProviderEventPayload eventDetails) +{ + Console.WriteLine(eventDetails.Type); +} +``` + +```csharp +EventHandlerDelegate callback = EventHandler; +// add an implementation of the EventHandlerDelegate for the PROVIDER_READY event +Api.Instance.AddHandler(ProviderEventTypes.ProviderReady, callback); +``` + +It is also possible to register an event handler for a specific client, as in the following example: + +```csharp +EventHandlerDelegate callback = EventHandler; + +var myClient = Api.Instance.GetClient("my-client"); + +var provider = new ExampleProvider(); +await Api.Instance.SetProviderAsync(myClient.GetMetadata().Name, provider); + +myClient.AddHandler(ProviderEventTypes.ProviderReady, callback); +``` + +### Shutdown + +The OpenFeature API provides a close function to perform a cleanup of all registered providers. This should only be called when your application is in the process of shutting down. + +```csharp +// Shut down all providers +await Api.Instance.ShutdownAsync(); +``` + +## Extending + +### Develop a provider + +To develop a provider, you need to create a new project and include the OpenFeature SDK as a dependency. +This can be a new repository or included in [the existing contrib repository](https://github.com/open-feature/dotnet-sdk-contrib) available under the OpenFeature organization. +Youโ€™ll then need to write the provider by implementing the `FeatureProvider` interface exported by the OpenFeature SDK. + +```csharp +public class MyProvider : FeatureProvider +{ + public override Metadata GetMetadata() + { + return new Metadata("My Provider"); + } + + public override Task> ResolveBooleanValueAsync(string flagKey, bool defaultValue, EvaluationContext? context = null, CancellationToken cancellationToken = default) + { + // resolve a boolean flag value + } + + public override Task> ResolveStringValueAsync(string flagKey, string defaultValue, EvaluationContext? context = null, CancellationToken cancellationToken = default) + { + // resolve a string flag value + } + + public override Task> ResolveIntegerValueAsync(string flagKey, int defaultValue, EvaluationContext context = null) + { + // resolve an int flag value + } + + public override Task> ResolveDoubleValueAsync(string flagKey, double defaultValue, EvaluationContext? context = null, CancellationToken cancellationToken = default) + { + // resolve a double flag value + } + + public override Task> ResolveStructureValueAsync(string flagKey, Value defaultValue, EvaluationContext? context = null, CancellationToken cancellationToken = default) + { + // resolve an object flag value + } +} +``` + +### Develop a hook + +To develop a hook, you need to create a new project and include the OpenFeature SDK as a dependency. +This can be a new repository or included in [the existing contrib repository](https://github.com/open-feature/dotnet-sdk-contrib) available under the OpenFeature organization. +Implement your own hook by conforming to the `Hook interface`. +To satisfy the interface, all methods (`Before`/`After`/`Finally`/`Error`) need to be defined. + +```csharp +public class MyHook : Hook +{ + public ValueTask BeforeAsync(HookContext context, + IReadOnlyDictionary hints = null) + { + // code to run before flag evaluation + } + + public ValueTask AfterAsync(HookContext context, FlagEvaluationDetails details, + IReadOnlyDictionary hints = null) + { + // code to run after successful flag evaluation + } + + public ValueTask ErrorAsync(HookContext context, Exception error, + IReadOnlyDictionary hints = null) + { + // code to run if there's an error during before hooks or during flag evaluation + } + + public ValueTask FinallyAsync(HookContext context, IReadOnlyDictionary hints = null) + { + // code to run after all other stages, regardless of success/failure + } +} +``` + +Built a new hook? [Let us know](https://github.com/open-feature/openfeature.dev/issues/new?assignees=&labels=hook&projects=&template=document-hook.yaml&title=%5BHook%5D%3A+) so we can add it to the docs! + + +## โญ๏ธ Support the project + +- Give this repo a โญ๏ธ! +- Follow us on social media: + - Twitter: [@openfeature](https://twitter.com/openfeature) + - LinkedIn: [OpenFeature](https://www.linkedin.com/company/openfeature/) +- Join us on [Slack](https://cloud-native.slack.com/archives/C0344AANLA1) +- For more information, check out our [community page](https://openfeature.dev/community/) + +## ๐Ÿค Contributing + +Interested in contributing? Great, we'd love your help! To get started, take a look at the [CONTRIBUTING](CONTRIBUTING.md) guide. + +### Thanks to everyone who has already contributed + +[![Contrib Rocks](https://contrib.rocks/image?repo=open-feature/dotnet-sdk)](https://github.com/open-feature/dotnet-sdk/graphs/contributors) + +Made with [contrib.rocks](https://contrib.rocks). + diff --git a/build/Common.prod.props b/build/Common.prod.props index 2431a810..656f3476 100644 --- a/build/Common.prod.props +++ b/build/Common.prod.props @@ -9,7 +9,7 @@ - 1.5.0 + 2.0.0 git https://github.com/open-feature/dotnet-sdk OpenFeature is an open standard for feature flag management, created to support a robust feature flag ecosystem using cloud native technologies. OpenFeature will provide a unified API and SDK, and a developer-first, cloud-native implementation, with extensibility for open source and commercial offerings. diff --git a/version.txt b/version.txt index bc80560f..227cea21 100644 --- a/version.txt +++ b/version.txt @@ -1 +1 @@ -1.5.0 +2.0.0