First implementation of adding ActivitySource to common operations to enable OpenTelemetry scenarios.

Linking existing context for publish if one exists

dotnet format

Adding standard tags without allocating.

Updating code after comments

Moving ActivitySource tests to Integration

Author: stebet

Diff for: .gitignore

@@ -1,3 +1,4 @@
+*.orig
 *.log
 _site/
 
@@ -28,6 +29,11 @@ test.sh
 test-output.log
 InternalTrace*
 nunit-agent*
+#################
+## JetBrains Rider
+#################
+.idea/
+
 #################
 ## Visual Studio
 #################

Diff for: RabbitMQDotNetClient.sln

@@ -5,6 +5,7 @@ MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{34486CC0-D61E-46BA-9E5E-6E8EFA7C34B5}"
 	ProjectSection(SolutionItems) = preProject
 		.editorconfig = .editorconfig
+		.gitignore = .gitignore
 	EndProjectSection
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "RabbitMQ.Client", "projects\RabbitMQ.Client\RabbitMQ.Client.csproj", "{8C554257-5ECC-45DB-873D-560BFBB74EC8}"

Diff for: projects/RabbitMQ.Client/PublicAPI.Unshipped.txt

@@ -481,8 +481,8 @@ RabbitMQ.Client.IChannel.BasicAcks -> System.EventHandler<RabbitMQ.Client.Events
 RabbitMQ.Client.IChannel.BasicGetAsync(string queue, bool autoAck) -> System.Threading.Tasks.ValueTask<RabbitMQ.Client.BasicGetResult>
 RabbitMQ.Client.IChannel.BasicNackAsync(ulong deliveryTag, bool multiple, bool requeue) -> System.Threading.Tasks.ValueTask
 RabbitMQ.Client.IChannel.BasicNacks -> System.EventHandler<RabbitMQ.Client.Events.BasicNackEventArgs>
-RabbitMQ.Client.IChannel.BasicPublishAsync<TProperties>(RabbitMQ.Client.CachedString exchange, RabbitMQ.Client.CachedString routingKey, in TProperties basicProperties, System.ReadOnlyMemory<byte> body = default(System.ReadOnlyMemory<byte>), bool mandatory = false) -> System.Threading.Tasks.ValueTask
-RabbitMQ.Client.IChannel.BasicPublishAsync<TProperties>(string exchange, string routingKey, in TProperties basicProperties, System.ReadOnlyMemory<byte> body = default(System.ReadOnlyMemory<byte>), bool mandatory = false) -> System.Threading.Tasks.ValueTask
+RabbitMQ.Client.IChannel.BasicPublishAsync<TProperties>(RabbitMQ.Client.CachedString exchange, RabbitMQ.Client.CachedString routingKey, TProperties basicProperties, System.ReadOnlyMemory<byte> body = default(System.ReadOnlyMemory<byte>), bool mandatory = false) -> System.Threading.Tasks.ValueTask
+RabbitMQ.Client.IChannel.BasicPublishAsync<TProperties>(string exchange, string routingKey, TProperties basicProperties, System.ReadOnlyMemory<byte> body = default(System.ReadOnlyMemory<byte>), bool mandatory = false) -> System.Threading.Tasks.ValueTask
 RabbitMQ.Client.IChannel.BasicReturn -> System.EventHandler<RabbitMQ.Client.Events.BasicReturnEventArgs>
 RabbitMQ.Client.IChannel.CallbackException -> System.EventHandler<RabbitMQ.Client.Events.CallbackExceptionEventArgs>
 RabbitMQ.Client.IChannel.ChannelNumber.get -> int
@@ -658,6 +658,7 @@ RabbitMQ.Client.PublicationAddress
 RabbitMQ.Client.PublicationAddress.PublicationAddress(string exchangeType, string exchangeName, string routingKey) -> void
 RabbitMQ.Client.QueueDeclareOk
 RabbitMQ.Client.QueueDeclareOk.QueueDeclareOk(string queueName, uint messageCount, uint consumerCount) -> void
+RabbitMQ.Client.RabbitMQActivitySource
 RabbitMQ.Client.ReadOnlyBasicProperties
 RabbitMQ.Client.ReadOnlyBasicProperties.AppId.get -> string
 RabbitMQ.Client.ReadOnlyBasicProperties.ClusterId.get -> string
@@ -851,6 +852,8 @@ static RabbitMQ.Client.IChannelExtensions.BasicPublishAsync<T>(this RabbitMQ.Cli
 static RabbitMQ.Client.PublicationAddress.Parse(string uriLikeString) -> RabbitMQ.Client.PublicationAddress
 static RabbitMQ.Client.PublicationAddress.TryParse(string uriLikeString, out RabbitMQ.Client.PublicationAddress result) -> bool
 static RabbitMQ.Client.QueueDeclareOk.implicit operator string(RabbitMQ.Client.QueueDeclareOk declareOk) -> string
+static RabbitMQ.Client.RabbitMQActivitySource.UseRoutingKeyAsOperationName.get -> bool
+static RabbitMQ.Client.RabbitMQActivitySource.UseRoutingKeyAsOperationName.set -> void
 static RabbitMQ.Client.TcpClientAdapter.GetMatchingHost(System.Collections.Generic.IReadOnlyCollection<System.Net.IPAddress> addresses, System.Net.Sockets.AddressFamily addressFamily) -> System.Net.IPAddress
 static RabbitMQ.Client.TimerBasedCredentialRefresherEventSource.Log.get -> RabbitMQ.Client.TimerBasedCredentialRefresherEventSource
 static readonly RabbitMQ.Client.CachedString.Empty -> RabbitMQ.Client.CachedString
@@ -881,6 +884,8 @@ virtual RabbitMQ.Client.TcpClientAdapter.Dispose(bool disposing) -> void
 virtual RabbitMQ.Client.TcpClientAdapter.GetStream() -> System.Net.Sockets.NetworkStream
 virtual RabbitMQ.Client.TcpClientAdapter.ReceiveTimeout.get -> System.TimeSpan
 virtual RabbitMQ.Client.TcpClientAdapter.ReceiveTimeout.set -> void
+~const RabbitMQ.Client.RabbitMQActivitySource.PublisherSourceName = "RabbitMQ.Client.Publisher" -> string
+~const RabbitMQ.Client.RabbitMQActivitySource.SubscriberSourceName = "RabbitMQ.Client.Subscriber" -> string
 ~override RabbitMQ.Client.Events.EventingBasicConsumer.HandleBasicDeliverAsync(string consumerTag, ulong deliveryTag, bool redelivered, string exchange, string routingKey, RabbitMQ.Client.ReadOnlyBasicProperties properties, System.ReadOnlyMemory<byte> body) -> System.Threading.Tasks.Task
 ~RabbitMQ.Client.ConnectionFactory.CreateConnectionAsync(RabbitMQ.Client.IEndpointResolver endpointResolver, string clientProvidedName, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) -> System.Threading.Tasks.Task<RabbitMQ.Client.IConnection>
 ~RabbitMQ.Client.ConnectionFactory.CreateConnectionAsync(string clientProvidedName, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) -> System.Threading.Tasks.Task<RabbitMQ.Client.IConnection>

Diff for: projects/RabbitMQ.Client/RabbitMQ.Client.csproj

@@ -80,4 +80,7 @@
     <PackageReference Include="System.IO.Pipelines" Version="8.0.0" />
   </ItemGroup>
 
+  <ItemGroup Condition="$(TargetFramework) == 'netstandard2.0'">
+    <PackageReference Include="System.Diagnostics.DiagnosticSource" Version="7.0.2" />
+  </ItemGroup>
 </Project>

Diff for: projects/RabbitMQ.Client/client/api/IChannel.cs

@@ -192,7 +192,7 @@ public interface IChannel : IDisposable
         ///     Routing key must be shorter than 255 bytes.
         ///   </para>
         /// </remarks>
-        ValueTask BasicPublishAsync<TProperties>(string exchange, string routingKey, in TProperties basicProperties, ReadOnlyMemory<byte> body = default, bool mandatory = false)
+        ValueTask BasicPublishAsync<TProperties>(string exchange, string routingKey, TProperties basicProperties, ReadOnlyMemory<byte> body = default, bool mandatory = false)
             where TProperties : IReadOnlyBasicProperties, IAmqpHeader;
 
         /// <summary>
@@ -203,7 +203,7 @@ ValueTask BasicPublishAsync<TProperties>(string exchange, string routingKey, in
         ///     Routing key must be shorter than 255 bytes.
         ///   </para>
         /// </remarks>
-        ValueTask BasicPublishAsync<TProperties>(CachedString exchange, CachedString routingKey, in TProperties basicProperties, ReadOnlyMemory<byte> body = default, bool mandatory = false)
+        ValueTask BasicPublishAsync<TProperties>(CachedString exchange, CachedString routingKey, TProperties basicProperties, ReadOnlyMemory<byte> body = default, bool mandatory = false)
             where TProperties : IReadOnlyBasicProperties, IAmqpHeader;
 
 #nullable disable

Diff for: projects/RabbitMQ.Client/client/api/IChannelExtensions.cs

@@ -89,14 +89,14 @@ public static Task<string> BasicConsumeAsync(this IChannel channel, string queue
         public static ValueTask BasicPublishAsync<T>(this IChannel channel, PublicationAddress addr, in T basicProperties, ReadOnlyMemory<byte> body)
             where T : IReadOnlyBasicProperties, IAmqpHeader
         {
-            return channel.BasicPublishAsync(addr.ExchangeName, addr.RoutingKey, in basicProperties, body);
+            return channel.BasicPublishAsync(addr.ExchangeName, addr.RoutingKey, basicProperties, body);
         }
 
         public static ValueTask BasicPublishAsync(this IChannel channel, string exchange, string routingKey, ReadOnlyMemory<byte> body = default, bool mandatory = false)
-            => channel.BasicPublishAsync(exchange, routingKey, in EmptyBasicProperty.Empty, body, mandatory);
+            => channel.BasicPublishAsync(exchange, routingKey, EmptyBasicProperty.Empty, body, mandatory);
 
         public static ValueTask BasicPublishAsync(this IChannel channel, CachedString exchange, CachedString routingKey, ReadOnlyMemory<byte> body = default, bool mandatory = false)
-            => channel.BasicPublishAsync(exchange, routingKey, in EmptyBasicProperty.Empty, body, mandatory);
+            => channel.BasicPublishAsync(exchange, routingKey, EmptyBasicProperty.Empty, body, mandatory);
 
 #nullable disable
 

Diff for: projects/RabbitMQ.Client/client/events/AsyncEventingBasicConsumer.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Diagnostics;
 using System.Threading.Tasks;
 using RabbitMQ.Client.Impl;
 
@@ -78,8 +79,9 @@ await base.HandleBasicConsumeOk(consumerTag)
         public override Task HandleBasicDeliver(string consumerTag, ulong deliveryTag, bool redelivered, string exchange, string routingKey,
             in ReadOnlyBasicProperties properties, ReadOnlyMemory<byte> body)
         {
+            var deliverEventArgs = new BasicDeliverEventArgs(consumerTag, deliveryTag, redelivered, exchange, routingKey, properties, body);
             // No need to call base, it's empty.
-            return _receivedWrapper.InvokeAsync(this, new BasicDeliverEventArgs(consumerTag, deliveryTag, redelivered, exchange, routingKey, properties, body));
+            return BasicDeliverWrapper(deliverEventArgs);
         }
 
         ///<summary>Fires the Shutdown event.</summary>
@@ -93,5 +95,13 @@ await _shutdownWrapper.InvokeAsync(this, reason)
                     .ConfigureAwait(false);
             }
         }
+
+        private async Task BasicDeliverWrapper(BasicDeliverEventArgs eventArgs)
+        {
+            using (Activity activity = RabbitMQActivitySource.Deliver(eventArgs))
+            {
+                await _receivedWrapper.InvokeAsync(this, eventArgs).ConfigureAwait(false);
+            }
+        }
     }
 }

Diff for: projects/RabbitMQ.Client/client/events/EventingBasicConsumer.cs

@@ -30,6 +30,7 @@
 //---------------------------------------------------------------------------
 
 using System;
+using System.Diagnostics;
 using System.Threading.Tasks;
 
 namespace RabbitMQ.Client.Events
@@ -88,10 +89,12 @@ public override void HandleBasicConsumeOk(string consumerTag)
         public override async Task HandleBasicDeliverAsync(string consumerTag, ulong deliveryTag, bool redelivered, string exchange, string routingKey,
             ReadOnlyBasicProperties properties, ReadOnlyMemory<byte> body)
         {
-            await base.HandleBasicDeliverAsync(consumerTag, deliveryTag, redelivered, exchange, routingKey, properties, body);
-            Received?.Invoke(
-                this,
-                new BasicDeliverEventArgs(consumerTag, deliveryTag, redelivered, exchange, routingKey, properties, body));
+            BasicDeliverEventArgs eventArgs = new BasicDeliverEventArgs(consumerTag, deliveryTag, redelivered, exchange, routingKey, properties, body);
+            using (Activity activity = RabbitMQActivitySource.SubscriberHasListeners ? RabbitMQActivitySource.Deliver(eventArgs) : default)
+            {
+                await base.HandleBasicDeliverAsync(consumerTag, deliveryTag, redelivered, exchange, routingKey, properties, body);
+                Received?.Invoke(this, eventArgs);
+            }
         }
 
         ///<summary>Fires the Shutdown event.</summary>

Diff for: projects/RabbitMQ.Client/client/impl/AsyncRpcContinuations.cs

@@ -72,6 +72,8 @@ public AsyncRpcContinuation(TimeSpan continuationTimeout)
             _tcsConfiguredTaskAwaitable = _tcs.Task.ConfigureAwait(false);
         }
 
+        internal DateTime StartTime { get; } = DateTime.UtcNow;
+
         public ConfiguredTaskAwaitable<T>.ConfiguredTaskAwaiter GetAwaiter()
         {
             return _tcsConfiguredTaskAwaitable.GetAwaiter();

Diff for: projects/RabbitMQ.Client/client/impl/AutorecoveringChannel.cs

@@ -290,13 +290,13 @@ public ValueTask<BasicGetResult> BasicGetAsync(string queue, bool autoAck)
         public ValueTask BasicNackAsync(ulong deliveryTag, bool multiple, bool requeue)
             => InnerChannel.BasicNackAsync(deliveryTag, multiple, requeue);
 
-        public ValueTask BasicPublishAsync<TProperties>(string exchange, string routingKey, in TProperties basicProperties, ReadOnlyMemory<byte> body, bool mandatory)
+        public ValueTask BasicPublishAsync<TProperties>(string exchange, string routingKey, TProperties basicProperties, ReadOnlyMemory<byte> body, bool mandatory)
             where TProperties : IReadOnlyBasicProperties, IAmqpHeader
-            => InnerChannel.BasicPublishAsync(exchange, routingKey, in basicProperties, body, mandatory);
+            => InnerChannel.BasicPublishAsync(exchange, routingKey, basicProperties, body, mandatory);
 
-        public ValueTask BasicPublishAsync<TProperties>(CachedString exchange, CachedString routingKey, in TProperties basicProperties, ReadOnlyMemory<byte> body, bool mandatory)
+        public ValueTask BasicPublishAsync<TProperties>(CachedString exchange, CachedString routingKey, TProperties basicProperties, ReadOnlyMemory<byte> body, bool mandatory)
             where TProperties : IReadOnlyBasicProperties, IAmqpHeader
-            => InnerChannel.BasicPublishAsync(exchange, routingKey, in basicProperties, body, mandatory);
+            => InnerChannel.BasicPublishAsync(exchange, routingKey, basicProperties, body, mandatory);
 
         public Task BasicQosAsync(uint prefetchSize, ushort prefetchCount, bool global)
         {