SimpleFlag is a simple feature flag package for .Net 8 that can be embedded in your application and provide an easy way to manage and evaluate Flags.
Install-Package SimpleFlag
Using Postgres
Install-Package SimpleFlag.PostgreSQLProgram.cs
With ConnectionString and Default Options
var builder = WebApplication.CreateBuilder(args);
...
builder.Services.AddSimpleFlag(options =>
{
options.UsePostgreSQL(builder.Configuration.GetConnectionString("ConnectionString"));
});
...With ConnectionString and Custom Options
var builder = WebApplication.CreateBuilder(args);
...
builder.Services.AddSimpleFlag(options =>
{
options.UsePostgreSQL(pgOptions =>
{
pgOptions.SchemaName = "flag";
pgOptions.TablePrefix = "sf";
pgOptions.Domain = "demo"; // this is not required, this is only to group feature flag on domains if this project is going to have a static domain
pgOptions.ConnectionString = builder.Configuration.GetConnectionString("ConnectionString");
});
});
...Using Custom DataSource with Custom Options
var builder = WebApplication.CreateBuilder(args);
...
builder.Services.AddSimpleFlag(options =>
{
options.UseCustom(customOptions =>
{
customOptions.SchemaName = "flag";
customOptions.TablePrefix = "sf";
customOptions.ConnectionString = builder.Configuration.GetConnectionString("ConnectionString");
customOptions.DataSourceMigration = MyDataSourceDatabaseMigration.Instance;
customOptions.DataSourceRepository = MyDataSourceRepository.Instance;
});
});
...In this case you need to implement the interface IDataSourceMigration and IDataSourceRepository
Using SimpleFlag Extension package to provide endpoints for management flags [!Working in progress]
Install-Package SimpleFlag.AspNetCore
Program.cs
var builder = WebApplication.CreateBuilder(args);
...
builder.Services.AddSimpleFlag(options =>
{
...
});
...
var app = builder.Build();
...
app.MapSimpleFlagEndpoints();
...You can inject ISimpleFlagClient interface and access different methods to evaluate a flag.
using SimpleFlag.Core;
using SimpleFlag.Core.Models;
public class MyService : IMyService
{
private readonly ISimpleFlagClient _simpleFlagClient;
public MyService(ISimpleFlagClient simpleFlagClient)
{
_simpleFlagClient = simpleFlagClient;
}
/// Evaluate the flag "my-service", if the flag does not exist return false as default value
public async Task<bool> IsOpenAsync(CancellationToken cancellationToken = default) =>
await _simpleFlagClient.GetValueAsync("my-service", false, cancellationToken: cancellationToken);
/// Evaluate the flag "my-service" for that user, if the flag does not exist or the user is not part of the segment of that flag return false as default value
public async Task<bool> IsOpenByUserAsync(FeatureFlagUser user, CancellationToken cancellationToken = default) =>
await _simpleFlagClient.GetValueAsync("my-service", false, user, cancellationToken: cancellationToken);
...
}- PostgreSQL (SimpleFlag.PostgreSQL)
Copyright (c) Alejandro Ferrandiz. See LICENSE for details.