Propagators Support

src/libraries/System.Diagnostics.DiagnosticSource/ref/System.Diagnostics.DiagnosticSourceActivity.cs

@@ -253,7 +253,20 @@ public sealed class ActivityListener : IDisposable
         public System.Diagnostics.SampleActivity<string>? SampleUsingParentId { get { throw null; } set { throw null; } }
         public System.Diagnostics.SampleActivity<ActivityContext>? Sample { get { throw null; } set { throw null; } }
         public void Dispose() { throw null; }
-   }
+    }
+    public abstract class TextMapPropagator
+    {
+      public delegate void PropagatorGetterCallback(object? carrier, string fieldName, out string? fieldValue, out System.Collections.Generic.IEnumerable<string>? fieldValues);
+      public delegate void PropagatorSetterCallback(object? carrier, string fieldName, string fieldValue);
+      public abstract System.Collections.Generic.IReadOnlyCollection<string> Fields { get; }
+      public abstract void Inject(Activity? activity, object? carrier, PropagatorSetterCallback? setter);
+      public abstract void ExtractTraceIdAndState(object? carrier, PropagatorGetterCallback? getter, out string? traceId, out string? traceState);
+      public abstract System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string, string?>>? ExtractBaggage(object? carrier, PropagatorGetterCallback? getter);
+      public static TextMapPropagator Current { get; set; }
+      public static TextMapPropagator CreateDefaultPropagator() { throw null; }
+      public static TextMapPropagator CreatePassThroughPropagator() { throw null; }
+      public static TextMapPropagator CreateNoOutputPropagator() { throw null; }
+    }
 }
 
 namespace System.Diagnostics.Metrics

src/libraries/System.Diagnostics.DiagnosticSource/src/System.Diagnostics.DiagnosticSource.csproj

@@ -39,7 +39,11 @@
     <Compile Include="System\Diagnostics\ActivitySource.cs" />
     <Compile Include="System\Diagnostics\DiagnosticSourceActivity.cs" />
     <Compile Include="System\Diagnostics\DiagLinkedList.cs" />
+    <Compile Include="System\Diagnostics\LegacyPropagator.cs" />
+    <Compile Include="System\Diagnostics\NoOutputPropagator.cs" />
+    <Compile Include="System\Diagnostics\PassThroughPropagator.cs" />
     <Compile Include="System\Diagnostics\RandomNumberGenerator.cs" />
+    <Compile Include="System\Diagnostics\TextMapPropagator.cs" />
     <Compile Include="System\Diagnostics\Metrics\AggregationManager.cs" />
     <Compile Include="System\Diagnostics\Metrics\Aggregator.cs" />
     <Compile Include="System\Diagnostics\Metrics\AggregatorStore.cs" />

src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/LegacyPropagator.cs

@@ -0,0 +1,189 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Net;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+
+namespace System.Diagnostics
+{
+    internal sealed class LegacyPropagator : TextMapPropagator
+    {
+        internal static TextMapPropagator Instance { get; } = new LegacyPropagator();
+
+        public override IReadOnlyCollection<string> Fields { get; } = new ReadOnlyCollection<string>(new[] { TraceParent, RequestId, TraceState, Baggage, CorrelationContext });
+
+        public override void Inject(Activity? activity, object? carrier, PropagatorSetterCallback? setter)
+        {
+            if (activity is null || setter is null)
+            {
+                return;
+            }
+
+            string? id = activity.Id;
+            if (id is null)
+            {
+                return;
+            }
+
+            if (activity.IdFormat == ActivityIdFormat.W3C)
+            {
+                setter(carrier, TraceParent, id);
+                if (!string.IsNullOrEmpty(activity.TraceStateString))
+                {
+                    setter(carrier, TraceState, activity.TraceStateString);
+                }
+            }
+            else
+            {
+                setter(carrier, RequestId, id);
+            }
+
+            InjectBaggage(carrier, activity.Baggage, setter);
+        }
+
+        public override void ExtractTraceIdAndState(object? carrier, PropagatorGetterCallback? getter, out string? traceId, out string? traceState)
+        {
+            if (getter is null)
+            {
+                traceId = null;
+                traceState = null;
+                return;
+            }
+
+            getter(carrier, TraceParent, out traceId, out _);
+            if (traceId is null)
+            {
+                getter(carrier, RequestId, out traceId, out _);
+            }
+
+            getter(carrier, TraceState, out traceState, out _);
+        }
+
+        public override IEnumerable<KeyValuePair<string, string?>>? ExtractBaggage(object? carrier, PropagatorGetterCallback? getter)
+        {
+            if (getter is null)
+            {
+                return null;
+            }
+
+            getter(carrier, Baggage, out string? theBaggage, out _);
+
+            IEnumerable<KeyValuePair<string, string?>>? baggage = null;
+            if (theBaggage is null || !TryExtractBaggage(theBaggage, out baggage))
+            {
+                getter(carrier, CorrelationContext, out theBaggage, out _);
+                if (theBaggage is not null)
+                {
+                    TryExtractBaggage(theBaggage, out baggage);
+                }
+            }
+
+            return baggage;
+        }
+
+        internal static bool TryExtractBaggage(string baggageString, out IEnumerable<KeyValuePair<string, string?>>? baggage)
+        {
+            baggage = null;
+            List<KeyValuePair<string, string?>>? baggageList = null;
+
+            if (string.IsNullOrEmpty(baggageString))
+            {
+                return true;
+            }
+
+            int currentIndex = 0;
+
+            do
+            {
+                // Skip spaces
+                while (currentIndex < baggageString.Length && (baggageString[currentIndex] == Space || baggageString[currentIndex] == Tab))
+                {
+                    currentIndex++;
+                }
+
+                if (currentIndex >= baggageString.Length)
+                {
+                    break; // No Key exist
+                }
+
+                int keyStart = currentIndex;
+
+                // Search end of the key
+                while (currentIndex < baggageString.Length && baggageString[currentIndex] != Space && baggageString[currentIndex] != Tab && baggageString[currentIndex] != '=')
+                {
+                    currentIndex++;
+                }
+
+                if (currentIndex >= baggageString.Length)
+                {
+                    break;
+                }
+
+                int keyEnd = currentIndex;
+
+                if (baggageString[currentIndex] != '=')
+                {
+                    // Skip Spaces
+                    while (currentIndex < baggageString.Length && (baggageString[currentIndex] == Space || baggageString[currentIndex] == Tab))
+                    {
+                        currentIndex++;
+                    }
+
+                    if (currentIndex >= baggageString.Length)
+                    {
+                        break; // Wrong key format
+                    }
+
+                    if (baggageString[currentIndex] != '=')
+                    {
+                        break; // wrong key format.
+                    }
+                }
+
+                currentIndex++;
+
+                // Skip spaces
+                while (currentIndex < baggageString.Length && (baggageString[currentIndex] == Space || baggageString[currentIndex] == Tab))
+                {
+                    currentIndex++;
+                }
+
+                if (currentIndex >= baggageString.Length)
+                {
+                    break; // Wrong value format
+                }
+
+                int valueStart = currentIndex;
+
+                // Search end of the value
+                while (currentIndex < baggageString.Length && baggageString[currentIndex] != Space && baggageString[currentIndex] != Tab &&
+                       baggageString[currentIndex] != Comma && baggageString[currentIndex] != Semicolon)
+                {
+                    currentIndex++;
+                }
+
+                if (keyStart < keyEnd && valueStart < currentIndex)
+                {
+                    baggageList ??= new();
+
+                    // Insert in reverse order for asp.net compatability.
+                    baggageList.Insert(0, new KeyValuePair<string, string?>(
+                                                WebUtility.UrlDecode(baggageString.Substring(keyStart, keyEnd - keyStart)).Trim(s_trimmingSpaceCharacters),
+                                                WebUtility.UrlDecode(baggageString.Substring(valueStart, currentIndex - valueStart)).Trim(s_trimmingSpaceCharacters)));
+                }
+
+                // Skip to end of values
+                while (currentIndex < baggageString.Length && baggageString[currentIndex] != Comma)
+                {
+                    currentIndex++;
+                }
+
+                currentIndex++; // Move to next key-value entry
+            } while (currentIndex < baggageString.Length);
+
+            baggage = baggageList;
+            return baggageList != null;
+        }
+    }
+}

src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/NoOutputPropagator.cs

@@ -0,0 +1,23 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Collections.Generic;
+
+namespace System.Diagnostics
+{
+    internal sealed class NoOutputPropagator : TextMapPropagator
+    {
+        internal static TextMapPropagator Instance { get; } = new NoOutputPropagator();
+
+        public override IReadOnlyCollection<string> Fields { get; } = LegacyPropagator.Instance.Fields;
+
+        public override void Inject(Activity? activity, object? carrier, PropagatorSetterCallback? setter)
+        {
+            // nothing to do.
+        }
+
+        public override void ExtractTraceIdAndState(object? carrier, PropagatorGetterCallback? getter, out string? traceId, out string? traceState) => LegacyPropagator.Instance.ExtractTraceIdAndState(carrier, getter, out traceId, out traceState);
+
+        public override IEnumerable<KeyValuePair<string, string?>>? ExtractBaggage(object? carrier, PropagatorGetterCallback? getter) => LegacyPropagator.Instance.ExtractBaggage(carrier, getter);
+    }
+}

src/libraries/System.Diagnostics.DiagnosticSource/src/System/Diagnostics/PassThroughPropagator.cs

@@ -0,0 +1,59 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Collections.Generic;
+
+namespace System.Diagnostics
+{
+    internal sealed class PassThroughPropagator : TextMapPropagator
+    {
+        internal static TextMapPropagator Instance { get; } = new PassThroughPropagator();
+
+        public override IReadOnlyCollection<string> Fields { get; } = LegacyPropagator.Instance.Fields;
+
+        public override void Inject(Activity? activity, object? carrier, PropagatorSetterCallback? setter)
+        {
+            if (setter is null)
+            {
+                return;
+            }
+
+            GetRootId(out string? parentId, out string? traceState, out bool isW3c, out IEnumerable<KeyValuePair<string, string?>>? baggage);
+            if (parentId is null)
+            {
+                return;
+            }
+
+            setter(carrier, isW3c ? TraceParent : RequestId, parentId);
+
+            if (!string.IsNullOrEmpty(traceState))
+            {
+                setter(carrier, TraceState, traceState);
+            }
+
+            if (baggage is not null)
+            {
+                InjectBaggage(carrier, baggage, setter);
+            }
+        }
+
+        public override void ExtractTraceIdAndState(object? carrier, PropagatorGetterCallback? getter, out string? traceId, out string? traceState) => LegacyPropagator.Instance.ExtractTraceIdAndState(carrier, getter, out traceId, out traceState);
+
+        public override IEnumerable<KeyValuePair<string, string?>>? ExtractBaggage(object? carrier, PropagatorGetterCallback? getter) => LegacyPropagator.Instance.ExtractBaggage(carrier, getter);
+
+        private static void GetRootId(out string? parentId, out string? traceState, out bool isW3c, out IEnumerable<KeyValuePair<string, string?>>? baggage)
+        {
+            Activity? activity = Activity.Current;
+
+            while (activity?.Parent is Activity parent)
+            {
+                activity = parent;
+            }
+
+            traceState = activity?.TraceStateString;
+            parentId = activity?.ParentId ?? activity?.Id;
+            isW3c = parentId is not null ? Activity.TryConvertIdToContext(parentId, traceState, out _) : false;
+            baggage = activity?.Baggage;
+        }
+    }
+}