* Move ThrottlingRateLimiter to RabbitMQ.Client namespace.

* Add the outline of a test for throttling publishes based on outstanding confirms.

Author: lukebakken

projects/RabbitMQ.Client/PublicAPI.Unshipped.txt

@@ -1,10 +1,10 @@
 const RabbitMQ.Client.Constants.PublishSequenceNumberHeader = "x-dotnet-pub-seq-no" -> string!
-const RabbitMQ.Client.Impl.ThrottlingRateLimiter.DefaultThrottlingPercentage = 50 -> int
-override RabbitMQ.Client.Impl.ThrottlingRateLimiter.AcquireAsyncCore(int permitCount, System.Threading.CancellationToken cancellationToken) -> System.Threading.Tasks.ValueTask<System.Threading.RateLimiting.RateLimitLease!>
-override RabbitMQ.Client.Impl.ThrottlingRateLimiter.AttemptAcquireCore(int permitCount) -> System.Threading.RateLimiting.RateLimitLease!
-override RabbitMQ.Client.Impl.ThrottlingRateLimiter.Dispose(bool disposing) -> void
-override RabbitMQ.Client.Impl.ThrottlingRateLimiter.GetStatistics() -> System.Threading.RateLimiting.RateLimiterStatistics?
-override RabbitMQ.Client.Impl.ThrottlingRateLimiter.IdleDuration.get -> System.TimeSpan?
+const RabbitMQ.Client.ThrottlingRateLimiter.DefaultThrottlingPercentage = 50 -> int
+override RabbitMQ.Client.ThrottlingRateLimiter.AcquireAsyncCore(int permitCount, System.Threading.CancellationToken cancellationToken) -> System.Threading.Tasks.ValueTask<System.Threading.RateLimiting.RateLimitLease!>
+override RabbitMQ.Client.ThrottlingRateLimiter.AttemptAcquireCore(int permitCount) -> System.Threading.RateLimiting.RateLimitLease!
+override RabbitMQ.Client.ThrottlingRateLimiter.Dispose(bool disposing) -> void
+override RabbitMQ.Client.ThrottlingRateLimiter.GetStatistics() -> System.Threading.RateLimiting.RateLimiterStatistics?
+override RabbitMQ.Client.ThrottlingRateLimiter.IdleDuration.get -> System.TimeSpan?
 RabbitMQ.Client.CreateChannelOptions
 RabbitMQ.Client.CreateChannelOptions.ConsumerDispatchConcurrency.get -> ushort?
 RabbitMQ.Client.CreateChannelOptions.ConsumerDispatchConcurrency.set -> void
@@ -26,8 +26,8 @@ RabbitMQ.Client.Exceptions.RabbitMQClientException.RabbitMQClientException() ->
 RabbitMQ.Client.IChannel.BasicPublishAsync<TProperties>(RabbitMQ.Client.CachedString! exchange, RabbitMQ.Client.CachedString! routingKey, bool mandatory, TProperties basicProperties, System.ReadOnlyMemory<byte> body, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) -> System.Threading.Tasks.ValueTask
 RabbitMQ.Client.IChannel.BasicPublishAsync<TProperties>(string! exchange, string! routingKey, bool mandatory, TProperties basicProperties, System.ReadOnlyMemory<byte> body, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) -> System.Threading.Tasks.ValueTask
 RabbitMQ.Client.IConnection.CreateChannelAsync(RabbitMQ.Client.CreateChannelOptions? options = null, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) -> System.Threading.Tasks.Task<RabbitMQ.Client.IChannel!>!
-RabbitMQ.Client.Impl.ThrottlingRateLimiter
-RabbitMQ.Client.Impl.ThrottlingRateLimiter.ThrottlingRateLimiter(int maxConcurrentCalls, int? throttlingPercentage = 50) -> void
+RabbitMQ.Client.ThrottlingRateLimiter
+RabbitMQ.Client.ThrottlingRateLimiter.ThrottlingRateLimiter(int maxConcurrentCalls, int? throttlingPercentage = 50) -> void
 static RabbitMQ.Client.CreateChannelOptions.Default.get -> RabbitMQ.Client.CreateChannelOptions!
 static RabbitMQ.Client.IChannelExtensions.BasicPublishAsync(this RabbitMQ.Client.IChannel! channel, RabbitMQ.Client.CachedString! exchange, RabbitMQ.Client.CachedString! routingKey, bool mandatory, System.ReadOnlyMemory<byte> body, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) -> System.Threading.Tasks.ValueTask
 static RabbitMQ.Client.IChannelExtensions.BasicPublishAsync(this RabbitMQ.Client.IChannel! channel, RabbitMQ.Client.CachedString! exchange, RabbitMQ.Client.CachedString! routingKey, System.ReadOnlyMemory<byte> body, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) -> System.Threading.Tasks.ValueTask

projects/RabbitMQ.Client/Impl/ThrottlingRateLimiter.cs renamed to projects/RabbitMQ.Client/ThrottlingRateLimiter.cs

@@ -34,7 +34,7 @@
 using System.Threading.RateLimiting;
 using System.Threading.Tasks;
 
-namespace RabbitMQ.Client.Impl
+namespace RabbitMQ.Client
 {
     public class ThrottlingRateLimiter : RateLimiter
     {

projects/Test/Integration/TestBasicPublish.cs

@@ -322,5 +322,73 @@ public async Task TestPropertiesRoundtrip_Headers()
             Assert.Equal(sendBody, consumeBody);
             Assert.Equal("World", response);
         }
+
+        [Fact]
+        public async Task TestPublisherConfirmationThrottling()
+        {
+            const int MaxOutstandingConfirms = 4;
+
+            var channelOpts = new CreateChannelOptions
+            {
+                PublisherConfirmationsEnabled = true,
+                PublisherConfirmationTrackingEnabled = true,
+                OutstandingPublisherConfirmationsRateLimiter = new ThrottlingRateLimiter(MaxOutstandingConfirms)
+            };
+
+            var channelCreatedTcs = new TaskCompletionSource<bool>(TaskCreationOptions.RunContinuationsAsynchronously);
+            var messagesPublishedTcs = new TaskCompletionSource<bool>(TaskCreationOptions.RunContinuationsAsynchronously);
+            Task publishTask = Task.Run(async () =>
+            {
+                ConnectionFactory cf = CreateConnectionFactory();
+
+                await using (IConnection conn = await cf.CreateConnectionAsync())
+                {
+                    await using (IChannel ch = await conn.CreateChannelAsync(channelOpts))
+                    {
+                        QueueDeclareOk q = await ch.QueueDeclareAsync();
+
+                        channelCreatedTcs.SetResult(true);
+
+                        int publishCount = 0;
+                        /*
+                         * Note: if batchSize equals MaxOutstandingConfirms,
+                         * a delay is added per-publish and this test takes much longer
+                         * to run. TODO figure out how the heck to test that
+                         */
+                        int batchSize = MaxOutstandingConfirms / 2;
+                        try
+                        {
+                            while (publishCount < 128)
+                            {
+                                var publishBatch = new List<ValueTask>();
+                                for (int i = 0; i < batchSize; i++)
+                                {
+                                    publishBatch.Add(ch.BasicPublishAsync("", q.QueueName, GetRandomBody()));
+                                }
+
+                                foreach (ValueTask pt in publishBatch)
+                                {
+                                    await pt;
+                                    publishCount++;
+                                }
+
+                                publishBatch.Clear();
+                                publishBatch = null;
+                            }
+
+                            messagesPublishedTcs.SetResult(true);
+                        }
+                        catch (Exception ex)
+                        {
+                            messagesPublishedTcs.SetException(ex);
+                        }
+                    }
+                }
+            });
+
+            await channelCreatedTcs.Task.WaitAsync(WaitSpan);
+            await messagesPublishedTcs.Task.WaitAsync(WaitSpan);
+            await publishTask.WaitAsync(WaitSpan);
+        }
     }
 }

projects/Test/Integration/TestToxiproxy.cs

@@ -105,9 +105,9 @@ public async Task TestCloseConnection()
                     }
 
                     /*
-                             * Note: using TrySetResult because this callback will be called when the
-                             * test exits, and connectionShutdownTcs will have already been set
-                             */
+                     * Note: using TrySetResult because this callback will be called when the
+                     * test exits, and connectionShutdownTcs will have already been set
+                     */
                     connectionShutdownTcs.TrySetResult(true);
                     return Task.CompletedTask;
                 };