muench-develops.FeatureToggler 1.0.0

muench-develops.FeatureToggler

muench-develops.FeatureToggler is a lightweight and extensible library for managing feature flags in .NET applications. It allows you to dynamically enable or disable features using multiple providers.

Features

• Multiple Providers: In-Memory, JSON, Environment Variables.
• ASP.NET Core Integration: Middleware for feature-based request handling.
• Extensible: Easily add custom providers.
• Thread-Safe: Safe for concurrent updates and queries.

Installation

Install via NuGet:

dotnet add package muench-develops.FeatureToggler

Quick Start

1. Register Feature Flags

builder.Services.AddFeatureFlags(
    new InMemoryFeatureFlagProvider(
        new[]
        {
            new FeatureFlag("EnableNewUI", true, "Enables the new UI"),
            new FeatureFlag("BetaFeature", false, "Beta feature toggle")
        })
);

2a. Use Middleware

Execute actions based on feature flag states:

app.UseFeatureFlag("EnableNewUI",
    onEnabled: () => Console.WriteLine("New UI is enabled!"),
    onDisabled: () => Console.WriteLine("New UI is disabled!"));

2b. Use Minimal API

app.MapGet("/", (FeatureFlagManager manaer) => manager.IsEnabled("EnableNewUI")
        ? Results.Ok("Welcome to the new UI!")
        : Results.Ok("Welcome to the old UI!"));

3. Query Flags

Check or update feature flags dynamically:

var manager = app.Services.GetRequiredService<FeatureFlagManager>();

if (manager.IsEnabled("EnableNewUI"))
{
    Console.WriteLine("New UI is enabled!");
}

License

This project is licensed under the Apache License. See the LICENSE file for details.