Trimming and AOT compatibility

Resolve the trim warning coming from RabbitMqClientEventSource.Error. Preserve the properties of RabbitMqExceptionDetail and suppress the warning.

The TimerBasedCredentialRefresherEventSource has warnings as well, but these can be suppressed because the parameters are primitive. In .NET 8 these warnings no longer need to be suppressed because of dotnet/runtime#83751.

Fix rabbitmq#1410

projects/RabbitMQ.Client/RabbitMQ.Client.csproj

@@ -4,6 +4,7 @@
     <TargetFrameworks>net6.0;netstandard2.0</TargetFrameworks>
     <NoWarn>$(NoWarn);CS1591</NoWarn>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
+    <EnableTrimAnalyzer>true</EnableTrimAnalyzer>
     <AssemblyTitle>RabbitMQ Client Library for .NET</AssemblyTitle>
     <Authors>VMware</Authors>
     <Company>VMware, Inc. or its affiliates.</Company>

projects/RabbitMQ.Client/client/api/ICredentialsRefresher.cs

@@ -31,6 +31,7 @@
 
 using System;
 using System.Collections.Concurrent;
+using System.Diagnostics.CodeAnalysis;
 using System.Diagnostics.Tracing;
 namespace RabbitMQ.Client
 {
@@ -39,7 +40,7 @@ public interface ICredentialsRefresher
         ICredentialsProvider Register(ICredentialsProvider provider, NotifyCredentialRefreshed callback);
         bool Unregister(ICredentialsProvider provider);
 
-        delegate void NotifyCredentialRefreshed(bool succesfully);
+        delegate void NotifyCredentialRefreshed(bool successfully);
     }
 
     [EventSource(Name = "TimerBasedCredentialRefresher")]
@@ -52,10 +53,16 @@ public class TimerBasedCredentialRefresherEventSource : EventSource
         [Event(2)]
         public void Unregistered(string name) => WriteEvent(2, "UnRegistered", name);
         [Event(3)]
+#if NET6_0_OR_GREATER
+        [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:RequiresUnreferencedCode", Justification = "Parameters to this method are primitive and are trimmer safe")]
+#endif
         public void ScheduledTimer(string name, double interval) => WriteEvent(3, "ScheduledTimer", name, interval);
         [Event(4)]
         public void TriggeredTimer(string name) => WriteEvent(4, "TriggeredTimer", name);
         [Event(5)]
+#if NET6_0_OR_GREATER
+        [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:RequiresUnreferencedCode", Justification = "Parameters to this method are primitive and are trimmer safe")]
+#endif
         public void RefreshedCredentials(string name, bool succesfully) => WriteEvent(5, "RefreshedCredentials", name, succesfully);
         [Event(6)]
         public void AlreadyRegistered(string name) => WriteEvent(6, "AlreadyRegistered", name);

projects/RabbitMQ.Client/client/logging/RabbitMqClientEventSource.cs

@@ -30,6 +30,7 @@
 //---------------------------------------------------------------------------
 
 using System;
+using System.Diagnostics.CodeAnalysis;
 using System.Diagnostics.Tracing;
 
 namespace RabbitMQ.Client.Logging
@@ -62,31 +63,30 @@ public void Warn(string message)
             if (IsEnabled())
                 WriteEvent(2, message);
         }
-#if NET452
-        [Event(3, Message = "ERROR", Keywords = Keywords.Log, Level = EventLevel.Error)]
-        public void Error(string message, string detail)
-        {
-            if(IsEnabled())
-                this.WriteEvent(3, message, detail);
-        }
-#else
+
         [Event(3, Message = "ERROR", Keywords = Keywords.Log, Level = EventLevel.Error)]
         public void Error(string message, RabbitMqExceptionDetail ex)
         {
             if (IsEnabled())
+            {
+#if NET6_0_OR_GREATER
+                WriteExceptionEvent(message, ex);
+
+                [UnconditionalSuppressMessage("Trimming", "IL2026", Justification = "The properties are preserved with the DynamicallyAccessedMembers attribute.")]
+                void WriteExceptionEvent<[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicProperties)] T>(string message, T ex)
+                {
+                    WriteEvent(3, message, ex);
+                }
+#else
                 WriteEvent(3, message, ex);
-        }
 #endif
+            }
+        }
 
         [NonEvent]
         public void Error(string message, Exception ex)
         {
-
-#if NET452
-            Error(message, ex.ToString());
-#else
             Error(message, new RabbitMqExceptionDetail(ex));
-#endif
         }
     }
 }

projects/RabbitMQ.Client/client/logging/RabbitMqExceptionDetail.cs

@@ -60,6 +60,10 @@ public RabbitMqExceptionDetail(IDictionary<string, object> ex)
             }
         }
 
+        // NOTE: This type is used to write EventData in RabbitMqClientEventSource.Error. To make it trim-compatible, these properties are preserved
+        // in RabbitMqClientEventSource. If RabbitMqExceptionDetail gets a property that is a complex type, we need to ensure the nested properties are
+        // preserved as well.
+
         public string Type { get; }
         public string Message { get; }
         public string StackTrace { get; }