Issue #125:Adding enricher for Wcf instrumentation

src/OpenTelemetry.Contrib.Instrumentation.Wcf/Implementation/WcfInstrumentationEventSource.cs

@@ -47,6 +47,21 @@ public void RequestFilterException(string exception)
             this.WriteEvent(EventIds.RequestFilterException, exception);
         }
 
+        [NonEvent]
+        public void EnrichmentException(Exception exception)
+        {
+            if (this.IsEnabled(EventLevel.Error, (EventKeywords)(-1)))
+            {
+                this.EnrichmentException(ToInvariantString(exception));
+            }
+        }
+
+        [Event(EventIds.EnrichmentException, Message = "Enrichment threw exception. Exception {0}.", Level = EventLevel.Error)]
+        public void EnrichmentException(string exception)
+        {
+            this.WriteEvent(EventIds.EnrichmentException, exception);
+        }
+
         /// <summary>
         /// Returns a culture-independent string representation of the given <paramref name="exception"/> object,
         /// appropriate for diagnostics tracing.
@@ -70,6 +85,7 @@ private class EventIds
         {
             public const int RequestIsFilteredOut = 1;
             public const int RequestFilterException = 2;
+            public const int EnrichmentException = 3;
         }
     }
 }

src/OpenTelemetry.Contrib.Instrumentation.Wcf/README.md

@@ -20,6 +20,24 @@ using var openTelemetry = Sdk.CreateTracerProviderBuilder()
     .Build();
 ```
 
+Instrumentation can be configured via options overload for `AddWcfInstrumentation` method:
+
+```csharp
+using var openTelemetry = Sdk.CreateTracerProviderBuilder()
+    .AddWcfInstrumentation(options => 
+    {
+        options.SuppressDownstreamInstrumentation = false;  
+        options.Enrich = (activity,eventName,message) =>    // -> Enable enriching an activity after it is created.
+        {
+            if(eventName == WcfEnrichEventNames.AfterReceiveRequest)  // For event names, please refer to string contstants in WcfEventNames class.
+            {
+                activity.AddTag("companyname.customtag", Guid.NewGuid());
+            }
+        }
+    })
+    .Build();
+```
+
 ## WCF Client Configuration (.NET Framework)
 
 Add the `IClientMessageInspector` instrumentation via a behavior extension on

src/OpenTelemetry.Contrib.Instrumentation.Wcf/TelemetryClientMessageInspector.cs

@@ -64,7 +64,6 @@ public object BeforeSendRequest(ref Message request, IClientChannel channel)
             Activity activity = WcfInstrumentationActivitySource.ActivitySource.StartActivity(
                 WcfInstrumentationActivitySource.OutgoingRequestActivityName,
                 ActivityKind.Client);
-
             IDisposable suppressionScope = this.SuppressDownstreamInstrumentation();
 
             if (activity != null)
@@ -111,6 +110,15 @@ public object BeforeSendRequest(ref Message request, IClientChannel channel)
                     {
                         activity.SetTag(WcfInstrumentationConstants.SoapViaTag, request.Properties.Via.ToString());
                     }
+
+                    try
+                    {
+                        WcfInstrumentationActivitySource.Options.Enrich?.Invoke(activity, WcfEnrichEventNames.BeforeSendRequest, request);
+                    }
+                    catch (Exception ex)
+                    {
+                        WcfInstrumentationEventSource.Log.EnrichmentException(ex);
+                    }
                 }
             }
 
@@ -139,6 +147,14 @@ public void AfterReceiveReply(ref Message reply, object correlationState)
                     }
 
                     activity.SetTag(WcfInstrumentationConstants.SoapReplyActionTag, reply.Headers.Action);
+                    try
+                    {
+                        WcfInstrumentationActivitySource.Options.Enrich?.Invoke(activity, WcfEnrichEventNames.AfterReceiveReply, reply);
+                    }
+                    catch (Exception ex)
+                    {
+                        WcfInstrumentationEventSource.Log.EnrichmentException(ex);
+                    }
                 }
 
                 activity.Stop();

src/OpenTelemetry.Contrib.Instrumentation.Wcf/TelemetryDispatchMessageInspector.cs

@@ -96,6 +96,15 @@ public object AfterReceiveRequest(ref Message request, IClientChannel channel, I
                         activity.SetTag(WcfInstrumentationConstants.WcfChannelSchemeTag, localAddressUri.Scheme);
                         activity.SetTag(WcfInstrumentationConstants.WcfChannelPathTag, localAddressUri.LocalPath);
                     }
+
+                    try
+                    {
+                        WcfInstrumentationActivitySource.Options.Enrich?.Invoke(activity, WcfEnrichEventNames.AfterReceiveRequest, request);
+                    }
+                    catch (Exception ex)
+                    {
+                        WcfInstrumentationEventSource.Log.EnrichmentException(ex);
+                    }
                 }
             }
 
@@ -121,6 +130,14 @@ public void BeforeSendReply(ref Message reply, object correlationState)
                     }
 
                     activity.SetTag(WcfInstrumentationConstants.SoapReplyActionTag, reply.Headers.Action);
+                    try
+                    {
+                        WcfInstrumentationActivitySource.Options.Enrich?.Invoke(activity, WcfEnrichEventNames.BeforeSendReply, reply);
+                    }
+                    catch (Exception ex)
+                    {
+                        WcfInstrumentationEventSource.Log.EnrichmentException(ex);
+                    }
                 }
 
                 activity.Stop();

src/OpenTelemetry.Contrib.Instrumentation.Wcf/WcfEnrichEventNames.cs

@@ -0,0 +1,46 @@
+// <copyright file="WcfEnrichEventNames.cs" company="OpenTelemetry Authors">
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// </copyright>
+
+namespace OpenTelemetry.Contrib.Instrumentation.Wcf
+{
+    /// <summary>
+    /// Constants used for event names when enriching an activity.
+    /// </summary>
+    public class WcfEnrichEventNames
+    {
+#if NETFRAMEWORK
+        /// <summary>
+        /// WCF service activity, event happens before WCF service method is invoked.
+        /// </summary>
+        public const string AfterReceiveRequest = "AfterReceiveRequest";
+
+        /// <summary>
+        /// WCF service activity, event happens after the WCF service method is invoked but before the reply is sent back to the client.
+        /// </summary>
+        public const string BeforeSendReply = "BeforeSendReply";
+#endif
+
+        /// <summary>
+        /// WCF client activity, event happens before the request is sent across the wire.
+        /// </summary>
+        public const string BeforeSendRequest = "BeforeSendRequest";
+
+        /// <summary>
+        /// WCF client activity, event happens after a reply from the WCF service is received.
+        /// </summary>
+        public const string AfterReceiveReply = "AfterReceiveReply";
+    }
+}

src/OpenTelemetry.Contrib.Instrumentation.Wcf/WcfInstrumentationOptions.cs

@@ -15,6 +15,7 @@
 // </copyright>
 
 using System;
+using System.Diagnostics;
 using System.ServiceModel.Channels;
 using OpenTelemetry.Context.Propagation;
 
@@ -34,6 +35,18 @@ public class WcfInstrumentationOptions
             new BaggagePropagator(),
         });
 
+        /// <summary>
+        /// Gets or sets an action to enrich an Activity.
+        /// </summary>
+        /// <remarks>
+        /// <para><see cref="Activity"/>: the activity being enriched.</para>
+        /// <para>string: the name of the event. Will be one of the constants in <see cref="WcfEnrichEventNames"/>.
+        /// </para>
+        /// <para>object: the raw <see cref="Message"/> from which additional information can be extracted to enrich the activity.
+        /// </para>
+        /// </remarks>
+        public Action<Activity, string, object> Enrich { get; set; }
+
         /// <summary>
         /// Gets or sets a Filter function to filter instrumentation for requests on a per request basis.
         /// The Filter gets the Message, and should return a boolean.

test/OpenTelemetry.Contrib.Instrumentation.Wcf.Tests/TelemetryClientMessageInspectorTests.cs

@@ -126,11 +126,13 @@ public void Dispose()
         [InlineData(true, false, false)]
         [InlineData(false)]
         [InlineData(true, false, true, true)]
+        [InlineData(true, false, true, true, true)]
         public async Task OutgoingRequestInstrumentationTest(
             bool instrument,
             bool filter = false,
             bool suppressDownstreamInstrumentation = true,
-            bool includeVersion = false)
+            bool includeVersion = false,
+            bool enrich = false)
         {
 #if NETFRAMEWORK
             const string OutgoingHttpOperationName = "OpenTelemetry.HttpWebRequest.HttpRequestOut";
@@ -147,6 +149,22 @@ public async Task OutgoingRequestInstrumentationTest(
                 builder
                     .AddWcfInstrumentation(options =>
                     {
+                        if (enrich)
+                        {
+                            options.Enrich = (activity, eventName, message) =>
+                            {
+                                switch (eventName)
+                                {
+                                    case WcfEnrichEventNames.BeforeSendRequest:
+                                        activity.AddTag("client.beforesendrequest", WcfEnrichEventNames.BeforeSendRequest);
+                                        break;
+                                    case WcfEnrichEventNames.AfterReceiveReply:
+                                        activity.AddTag("client.afterreceivereply", WcfEnrichEventNames.AfterReceiveReply);
+                                        break;
+                                }
+                            };
+                        }
+
                         options.OutgoingRequestFilter = (Message m) =>
                         {
                             return !filter;
@@ -226,6 +244,12 @@ public async Task OutgoingRequestInstrumentationTest(
                         {
                             Assert.Equal("Soap11 (http://schemas.xmlsoap.org/soap/envelope/) AddressingNone (http://schemas.microsoft.com/ws/2005/05/addressing/none)", activity.TagObjects.FirstOrDefault(t => t.Key == WcfInstrumentationConstants.SoapMessageVersionTag).Value);
                         }
+
+                        if (enrich)
+                        {
+                            Assert.Equal(WcfEnrichEventNames.BeforeSendRequest, activity.TagObjects.Single(t => t.Key == "client.beforesendrequest").Value);
+                            Assert.Equal(WcfEnrichEventNames.AfterReceiveReply, activity.TagObjects.Single(t => t.Key == "client.afterreceivereply").Value);
+                        }
                     }
                     else
                     {

test/OpenTelemetry.Contrib.Instrumentation.Wcf.Tests/TelemetryDispatchMessageInspectorTests.netfx.cs

@@ -87,10 +87,12 @@ public void Dispose()
         [InlineData(true, true)]
         [InlineData(false)]
         [InlineData(true, false, true)]
+        [InlineData(true, false, true, true)]
         public async Task IncomingRequestInstrumentationTest(
             bool instrument,
             bool filter = false,
-            bool includeVersion = false)
+            bool includeVersion = false,
+            bool enrich = false)
         {
             List<Activity> stoppedActivities = new List<Activity>();
 
@@ -108,6 +110,22 @@ public async Task IncomingRequestInstrumentationTest(
                 tracerProvider = Sdk.CreateTracerProviderBuilder()
                     .AddWcfInstrumentation(options =>
                     {
+                        if (enrich)
+                        {
+                            options.Enrich = (activity, eventName, message) =>
+                            {
+                                switch (eventName)
+                                {
+                                    case WcfEnrichEventNames.AfterReceiveRequest:
+                                        activity.AddTag("server.afterreceiverequest", WcfEnrichEventNames.AfterReceiveRequest);
+                                        break;
+                                    case WcfEnrichEventNames.BeforeSendReply:
+                                        activity.AddTag("server.beforesendreply", WcfEnrichEventNames.BeforeSendReply);
+                                        break;
+                                }
+                            };
+                        }
+
                         options.IncomingRequestFilter = (Message m) =>
                         {
                             return !filter;
@@ -164,6 +182,12 @@ public async Task IncomingRequestInstrumentationTest(
                 {
                     Assert.Equal("Soap12 (http://www.w3.org/2003/05/soap-envelope) Addressing10 (http://www.w3.org/2005/08/addressing)", activity.TagObjects.FirstOrDefault(t => t.Key == WcfInstrumentationConstants.SoapMessageVersionTag).Value);
                 }
+
+                if (enrich)
+                {
+                    Assert.Equal(WcfEnrichEventNames.AfterReceiveRequest, activity.TagObjects.Single(t => t.Key == "server.afterreceiverequest").Value);
+                    Assert.Equal(WcfEnrichEventNames.BeforeSendReply, activity.TagObjects.Single(t => t.Key == "server.beforesendreply").Value);
+                }
             }
             else
             {