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13 changes: 13 additions & 0 deletions
13
examples/FeatureFlagger.Example.Console/FeatureFlagger.Examples.Console.fsproj
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 1,13 @@ | ||
| <Project Sdk="Microsoft.NET.Sdk"> | ||
| <PropertyGroup> | ||
| <OutputType>Exe</OutputType> | ||
| <TargetFramework>netcoreapp1.1</TargetFramework> | ||
| </PropertyGroup> | ||
| <ItemGroup> | ||
| <ProjectReference Include="../../src/FeatureFlagger/FeatureFlagger.csproj"> | ||
| <Name>FeatureFlagger.csproj</Name> | ||
| </ProjectReference> | ||
| </ItemGroup> | ||
| <ItemGroup /> | ||
| <Import Project="..\..\.paket\Paket.Restore.targets" /> | ||
| </Project> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 1,74 @@ | ||
| namespace FeatureFlagger.Behaviours | ||
| { | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.Linq; | ||
|
|
||
| public class Bucket : IBucket | ||
| { | ||
| // NOTE: this *really* shouldn't be in memory! | ||
| // dictionary has key = bucketName, value = userName list. | ||
| private readonly Dictionary<string, List<string>> buckets; | ||
|
|
||
| public Bucket() | ||
| { | ||
| buckets = new Dictionary<string, List<string>>(); | ||
| } | ||
|
|
||
| public bool Check(string bucketName, string userName) | ||
| { | ||
| bucketName = bucketName.ToUpperInvariant(); | ||
| userName = userName.ToUpperInvariant(); | ||
| List<string> users; | ||
| if (!buckets.ContainsKey(bucketName) | ||
| || !buckets.TryGetValue(bucketName, out users)) | ||
| { | ||
| return false; | ||
| } | ||
|
|
||
| return users.Contains(userName); | ||
| } | ||
|
|
||
| public bool CheckVariants(string featureName, string userName) | ||
| { | ||
| // get the base feature name. | ||
| featureName = | ||
| featureName.Remove( | ||
| featureName.IndexOf( | ||
| Constants.VariantSeparator, | ||
| StringComparison.OrdinalIgnoreCase)); | ||
|
|
||
| // find all the buckets for the group of variants. | ||
| var featureBuckets = | ||
| buckets.Keys.ToList() | ||
| .FindAll( | ||
| x => | ||
| x.StartsWith(featureName, StringComparison.OrdinalIgnoreCase)); | ||
|
|
||
| // check all the variant buckets for the given user. | ||
| return featureBuckets.Any(b => Check(b, userName)); | ||
| } | ||
|
|
||
| public void Add(string bucketName, string userName) | ||
| { | ||
| bucketName = bucketName.ToUpperInvariant(); | ||
| userName = userName.ToUpperInvariant(); | ||
| if (buckets.ContainsKey(bucketName)) | ||
| { | ||
| List<string> users; | ||
| // ReSharper disable once InvertIf | ||
| if (buckets.TryGetValue(bucketName, out users)) | ||
| { | ||
| if (!users.Contains(userName)) | ||
| { | ||
| users.Add(userName); | ||
| } | ||
| } | ||
| } | ||
| else | ||
| { | ||
| buckets.Add(bucketName, new List<string> { userName }); | ||
| } | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 1,138 @@ | ||
| namespace FeatureFlagger.Behaviours | ||
| { | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.ComponentModel.Composition; | ||
| using System.Security.Cryptography; | ||
|
|
||
| [Export(typeof(IBehaviour))] | ||
| public class DistributionBehaviour : IBehaviour | ||
| { | ||
| private static readonly Random Random = new Random(); | ||
| private static readonly object Synclock = new object(); | ||
| private readonly IUser user; | ||
| private readonly IBucket bucket; | ||
|
|
||
| [ImportingConstructor] | ||
| public DistributionBehaviour( | ||
| [Import(AllowDefault = true)] IUser user, | ||
| [Import(AllowDefault = true)] IBucket bucket) | ||
| { | ||
| this.user = user ?? new User(); | ||
| this.bucket = bucket ?? new Bucket(); | ||
| } | ||
|
|
||
| // <distribution [percentage="0.125"] /> | ||
| public Func<Dictionary<string, string>, bool> Behaviour() | ||
| { | ||
| const string ControlSubstring = Constants.VariantSeparator Constants.Control; | ||
|
|
||
| return x => | ||
| { | ||
| var featureName = x[Constants.Feature]; | ||
| var userName = user.UserName; | ||
| // Debug.WriteLine($"UserName: {userName}, FeatureName: {featureName}"); | ||
| // check the bucket. | ||
| var isInBucket = bucket.Check(featureName, userName); | ||
| if (isInBucket) | ||
| { | ||
| // this user is already using this variant. | ||
| return true; | ||
| } | ||
| var percentage = GetPercentage(x); | ||
| // is it an A/B test or an ABCD test? | ||
| // we do this on the naming conventions where | ||
| // an ABCD test contains a variant name. | ||
| if (featureName.Contains(Constants.VariantSeparator)) | ||
| { | ||
| // ABCD. | ||
| if (bucket.CheckVariants(featureName, userName)) | ||
| { | ||
| return false; | ||
| } | ||
| if (featureName.IndexOf(ControlSubstring, StringComparison.OrdinalIgnoreCase) >= 0) | ||
| { | ||
| // _Control variant must be checked last in code flow | ||
| // which places an onus on the ordering of variants. | ||
| bucket.Add(featureName, userName); | ||
| // this user is now in the split test's control group. | ||
| return true; | ||
| } | ||
| // ReSharper disable once InvertIf : it's clearer this way. | ||
| if (RollDice(percentage)) | ||
| { | ||
| bucket.Add(featureName, userName); | ||
| // this user is now using this variant. | ||
| return true; | ||
| } | ||
| // so, not this variant. | ||
| return false; | ||
| } | ||
| // A/B. | ||
| var control = featureName ControlSubstring; | ||
| isInBucket = bucket.Check(control, userName); | ||
| if (isInBucket) | ||
| { | ||
| // this user is already in the control group. | ||
| return false; | ||
| } | ||
| if (RollDice(percentage)) | ||
| { | ||
| bucket.Add(featureName, userName); | ||
| // in an A/B test this user will get the functionality. | ||
| return true; | ||
| } | ||
| // control. | ||
| bucket.Add(control, userName); | ||
| return false; | ||
| }; | ||
| } | ||
|
|
||
| private static decimal GetPercentage(IReadOnlyDictionary<string, string> x) | ||
| { | ||
| // percentage is optional: we don't use it for the control group. | ||
| string percent = | ||
| x.TryGetValue(Constants.Percentage, out percent) | ||
| ? percent | ||
| : "0"; | ||
|
|
||
| var percentage = Convert.ToDecimal(percent); | ||
|
|
||
| // want percentages as decimals, i.e. 0.125 is 12.5%. | ||
| if (percentage > 1) | ||
| { | ||
| throw new ArgumentException("Distribution percentage must be expressed as a decimal."); | ||
| } | ||
|
|
||
| return percentage; | ||
| } | ||
|
|
||
| private static bool RollDice(decimal percentage) | ||
| { | ||
| lock (Synclock) | ||
| { | ||
| var randomNumber = new byte[1]; | ||
| var crytoService = new RNGCryptoServiceProvider(); | ||
| crytoService.GetBytes(randomNumber); | ||
| var diceRoll = (randomNumber[0] % 100) 1; | ||
|
|
||
| return diceRoll <= percentage * 100; | ||
| } | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 1,12 @@ | ||
| namespace FeatureFlagger.Behaviours | ||
| { | ||
| public interface IBucket | ||
| { | ||
| bool Check(string bucketName, string userName); | ||
|
|
||
| bool CheckVariants(string featureName, string userName); | ||
|
|
||
| void Add(string bucketName, string userName); | ||
| } | ||
|
|
||
| } |
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2 changes: 1 addition & 1 deletion
2
src/FeatureFlagger.ConfigurationReaders/IConfigurationSectionHandler.cs
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12 changes: 12 additions & 0 deletions
12
src/FeatureFlagger.ConfigurationWriters/FeatureFlagger.ConfigurationWriters.csproj
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 1,12 @@ | ||
| <Project Sdk="Microsoft.NET.Sdk"> | ||
| <PropertyGroup> | ||
| <TargetFramework>netstandard2.0</TargetFramework> | ||
| </PropertyGroup> | ||
| <ItemGroup> | ||
| <ProjectReference Include="..\FeatureFlagger.Domain\FeatureFlagger.Domain.csproj" /> | ||
| </ItemGroup> | ||
| <ItemGroup> | ||
| <PackageReference Include="System.Data.SqlClient" Version="4.6.1" /> | ||
| </ItemGroup> | ||
| <Import Project="..\..\.paket\Paket.Restore.targets" /> | ||
| </Project> |
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