Fix bug in GetAs<T> related to class/struct

DataDog · Jun 24, 2024 · 7b76743 · 7b76743
1 parent 0f11754
commit 7b76743
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Showing 3 changed files with 26 additions and 19 deletions.
diff --git a/...er/src/Datadog.Trace/Configuration/ConfigurationSources/Telemetry/ConfigurationBuilder.cs b/...er/src/Datadog.Trace/Configuration/ConfigurationSources/Telemetry/ConfigurationBuilder.cs
@@ -245,26 +245,32 @@ public string AsString(string defaultValue, Func<string, bool>? validator)
             return defaultValue;
         }
 
+        // We have to use different methods for class/struct when we _don't_ have a null value, because NRTs don't work properly otherwise
         [return: NotNullIfNotNull(nameof(getDefaultValue))]
-        public T? GetAs<T>(Func<DefaultResult<T>>? getDefaultValue, Func<T, bool>? validator, Func<string, ParsingResult<T>> converter)
+        public T GetAs<T>(Func<DefaultResult<T>> getDefaultValue, Func<T, bool>? validator, Func<string, ParsingResult<T>> converter)
         {
             var result = GetAs(validator, converter);
+            return TryHandleResult(Telemetry, Key, result, recordValue: true, getDefaultValue, out var value)
+                       ? value
+                       : default!; // TryHandleResult always returns true as getDefaultValue != null
+        }
 
-            // We have a valid value
-            if (result is { Result: { } value, IsValid: true })
-            {
-                return value;
-            }
-
-            // don't have a valid value
-            if (getDefaultValue is null)
-            {
-                return default;
-            }
+        public T? GetAsClass<T>(Func<T, bool>? validator, Func<string, ParsingResult<T>> converter)
+            where T : class
+        {
+            var result = GetAs(validator, converter);
+            return TryHandleResult(Telemetry, Key, result, recordValue: true, getDefaultValue: null, out var value)
+                       ? value
+                       : null;
+        }
 
-            var defaultValue = getDefaultValue();
-            Telemetry.Record(Key, defaultValue.TelemetryValue, recordValue: true, ConfigurationOrigins.Default);
-            return defaultValue.Result!;
+        public T? GetAsStruct<T>(Func<T, bool>? validator, Func<string, ParsingResult<T>> converter)
+            where T : struct
+        {
+            var result = GetAs(validator, converter);
+            return TryHandleResult(Telemetry, Key, result, recordValue: true, getDefaultValue: null, out var value)
+                       ? value
+                       : null;
         }
 
         [return: NotNullIfNotNull(nameof(getDefaultValue))]

diff --git a/tracer/src/Datadog.Trace/Configuration/DynamicConfigurationManager.cs b/tracer/src/Datadog.Trace/Configuration/DynamicConfigurationManager.cs
@@ -77,7 +77,9 @@ private static void OnConfigurationChanged(ConfigurationBuilder settings)
                 TraceEnabled = settings.WithKeys(ConfigurationKeys.TraceEnabled).AsBool(),
                 // RuntimeMetricsEnabled = settings.WithKeys(ConfigurationKeys.RuntimeMetricsEnabled).AsBool(),
                 // DataStreamsMonitoringEnabled = settings.WithKeys(ConfigurationKeys.DataStreamsMonitoring.Enabled).AsBool(),
-                SamplingRules = settings.WithKeys(ConfigurationKeys.CustomSamplingRules).GetAs<string>(null, null, s => s),
+                // Note: Calling GetAsClass<string>() here instead of GetAsString() as we need to get the
+                // "serialized JToken", which in JsonConfigurationSource is different, as it allows for non-string tokens
+                SamplingRules = settings.WithKeys(ConfigurationKeys.CustomSamplingRules).GetAsClass<string>(validator: null, converter: s => s),
                 GlobalSamplingRate = settings.WithKeys(ConfigurationKeys.GlobalSamplingRate).AsDouble(),
                 // SpanSamplingRules = settings.WithKeys(ConfigurationKeys.SpanSamplingRules).AsString(),
                 LogsInjectionEnabled = settings.WithKeys(ConfigurationKeys.LogsInjectionEnabled).AsBool(),

diff --git a/tracer/test/Datadog.Trace.Tests/Configuration/Telemetry/ConfigurationBuilderTests.cs b/tracer/test/Datadog.Trace.Tests/Configuration/Telemetry/ConfigurationBuilderTests.cs
@@ -627,10 +627,9 @@ public void GetAs_ReturnsNullWhenCantParseAndNoDefault(string value)
 
             var actual = new ConfigurationBuilder(source, _telemetry)
                         .WithKeys("key")
-                        .GetAs(
-                             getDefaultValue: null,
+                        .GetAsStruct(
                              validator: null,
-                             converter: _nullableConverter);
+                             converter: _converter);
 
             actual.Should().BeNull();
         }