Prevent user attributes dictionary from being created multiple times …

…per evaluation
configcat · Nov 7, 2023 · 0522f72 · 0522f72
1 parent 1fb9f2d
commit 0522f72
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Showing 2 changed files with 18 additions and 18 deletions.
diff --git a/src/ConfigCatClient/Evaluation/EvaluateContext.cs b/src/ConfigCatClient/Evaluation/EvaluateContext.cs
@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using ConfigCat.Client.Utils;
 
 namespace ConfigCat.Client.Evaluation;
@@ -7,11 +8,15 @@ internal struct EvaluateContext
 {
     public readonly string Key;
     public readonly Setting Setting;
-    public readonly User? User;
     public readonly IReadOnlyDictionary<string, Setting> Settings;
 
+    private readonly User? user;
+
+    [MemberNotNullWhen(true, nameof(UserAttributes))]
+    public readonly bool IsUserAvailable => this.user is not null;
+
     private IReadOnlyDictionary<string, string>? userAttributes;
-    public IReadOnlyDictionary<string, string>? UserAttributes => this.userAttributes ??= this.User?.GetAllAttributes();
+    public IReadOnlyDictionary<string, string>? UserAttributes => this.userAttributes ??= this.user?.GetAllAttributes();
 
     private List<string>? visitedFlags;
     public List<string> VisitedFlags => this.visitedFlags ??= new List<string>();
@@ -25,7 +30,7 @@ public EvaluateContext(string key, Setting setting, User? user, IReadOnlyDiction
     {
         this.Key = key;
         this.Setting = setting;
-        this.User = user;
+        this.user = user;
         this.Settings = settings;
 
         this.userAttributes = null;
@@ -35,9 +40,9 @@ public EvaluateContext(string key, Setting setting, User? user, IReadOnlyDiction
     }
 
     public EvaluateContext(string key, Setting setting, ref EvaluateContext dependentFlagContext)
-        : this(key, setting, dependentFlagContext.User, dependentFlagContext.Settings)
+        : this(key, setting, dependentFlagContext.user, dependentFlagContext.Settings)
     {
-        this.userAttributes = dependentFlagContext.userAttributes;
+        this.userAttributes = dependentFlagContext.UserAttributes;
         this.visitedFlags = dependentFlagContext.VisitedFlags; // crucial to use the property here to make sure the list is created!
         this.LogBuilder = dependentFlagContext.LogBuilder;
     }

diff --git a/src/ConfigCatClient/Evaluation/RolloutEvaluator.cs b/src/ConfigCatClient/Evaluation/RolloutEvaluator.cs
@@ -35,7 +35,7 @@ public EvaluateResult Evaluate<T>(T defaultValue, ref EvaluateContext context, [
 
             logBuilder.Append($"Evaluating '{context.Key}'");
 
-            if (context.User is not null)
+            if (context.IsUserAvailable)
             {
                 logBuilder.Append($" for User '{context.UserAttributes.Serialize()}'");
             }
@@ -173,7 +173,7 @@ private bool TryEvaluatePercentageOptions(PercentageOption[] percentageOptions,
     {
         var logBuilder = context.LogBuilder;
 
-        if (context.User is null)
+        if (!context.IsUserAvailable)
         {
             logBuilder?.NewLine("Skipping % options because the User Object is missing.");
 
@@ -187,14 +187,9 @@ private bool TryEvaluatePercentageOptions(PercentageOption[] percentageOptions,
             return false;
         }
 
-        string? percentageOptionsAttributeValue;
-        var percentageOptionsAttributeName = context.Setting.PercentageOptionsAttribute;
-        if (percentageOptionsAttributeName is null)
-        {
-            percentageOptionsAttributeName = nameof(User.Identifier);
-            percentageOptionsAttributeValue = context.User.Identifier;
-        }
-        else if (!context.UserAttributes!.TryGetValue(percentageOptionsAttributeName, out percentageOptionsAttributeValue))
+        var percentageOptionsAttributeName = context.Setting.PercentageOptionsAttribute ?? nameof(User.Identifier);
+
+        if (!context.UserAttributes.TryGetValue(percentageOptionsAttributeName, out var percentageOptionsAttributeValue))
         {
             logBuilder?.NewLine().Append($"Skipping % options because the User.{percentageOptionsAttributeName} attribute is missing.");
 
@@ -334,7 +329,7 @@ private bool EvaluateUserCondition(UserCondition condition, string contextSalt,
         var logBuilder = context.LogBuilder;
         logBuilder?.AppendUserCondition(condition);
 
-        if (context.User is null)
+        if (!context.IsUserAvailable)
         {
             if (!context.IsMissingUserObjectLogged)
             {
@@ -348,7 +343,7 @@ private bool EvaluateUserCondition(UserCondition condition, string contextSalt,
 
         var userAttributeName = condition.ComparisonAttribute ?? throw new InvalidOperationException("Comparison attribute name is missing.");
 
-        if (!(context.UserAttributes!.TryGetValue(userAttributeName, out var userAttributeValue) && userAttributeValue.Length > 0))
+        if (!(context.UserAttributes.TryGetValue(userAttributeName, out var userAttributeValue) && userAttributeValue.Length > 0))
         {
             this.logger.UserObjectAttributeIsMissing(condition.ToString(), context.Key, userAttributeName);
             error = string.Format(CultureInfo.InvariantCulture, MissingUserAttributeError, userAttributeName);
@@ -783,7 +778,7 @@ private bool EvaluateSegmentCondition(SegmentCondition condition, ref EvaluateCo
         var logBuilder = context.LogBuilder;
         logBuilder?.AppendSegmentCondition(condition);
 
-        if (context.User is null)
+        if (!context.IsUserAvailable)
         {
             if (!context.IsMissingUserObjectLogged)
             {