| | | 1 | | using Microsoft.Extensions.Logging; |
| | | 2 | | using RabbitMQ.Client; |
| | | 3 | | using System.Collections; |
| | | 4 | | using System.Diagnostics; |
| | | 5 | | using System.Threading.Channels; |
| | | 6 | | |
| | | 7 | | namespace AsyncResponse.Transports.RabbitMQ; |
| | | 8 | | |
| | | 9 | | internal enum RabbitMqSubscriberRole |
| | | 10 | | { |
| | | 11 | | Worker, |
| | | 12 | | ResponseIngress |
| | | 13 | | } |
| | | 14 | | |
| | | 15 | | internal abstract class RabbitMqMessageDispatcher : IAsyncDisposable |
| | | 16 | | { |
| | | 17 | | private readonly Func<RabbitMqDelivery, CancellationToken, Task> _handler; |
| | | 18 | | private readonly RabbitMqSubscriberOptions _subscriberOptions; |
| | | 19 | | private readonly string _queue; |
| | | 20 | | private readonly RabbitMqSubscriberRole _role; |
| | | 21 | | |
| | | 22 | | /// <summary>Runs the RabbitMqMessageDispatcher operation.</summary> |
| | | 23 | | protected RabbitMqMessageDispatcher( |
| | | 24 | | Func<RabbitMqDelivery, CancellationToken, Task> handler, |
| | | 25 | | RabbitMqAsyncResponseOptions transportOptions, |
| | | 26 | | RabbitMqSubscriberOptions subscriberOptions, |
| | | 27 | | ILogger logger, |
| | | 28 | | string queue, |
| | | 29 | | RabbitMqSubscriberRole role) |
| | | 30 | | { |
| | | 31 | | _handler = handler; |
| | | 32 | | TransportOptions = transportOptions; |
| | | 33 | | _subscriberOptions = subscriberOptions; |
| | | 34 | | Logger = logger; |
| | | 35 | | _queue = queue; |
| | | 36 | | _role = role; |
| | | 37 | | } |
| | | 38 | | |
| | | 39 | | protected RabbitMqAsyncResponseOptions TransportOptions { get; } |
| | | 40 | | protected ILogger Logger { get; } |
| | | 41 | | |
| | | 42 | | /// <summary> |
| | | 43 | | /// Maximum delivery attempts before a failing <see cref="RabbitMqAckMode.AckAfterHandlerCompletes"/> handler |
| | | 44 | | /// rejects without requeue. <c>0</c> means unlimited (requeue forever). |
| | | 45 | | /// </summary> |
| | | 46 | | protected int MaxDeliveryAttempts => _subscriberOptions.MaxDeliveryAttempts; |
| | | 47 | | |
| | | 48 | | /// <summary> |
| | | 49 | | /// Resolves the 1-based delivery attempt for a message from the broker's <c>x-death</c> count and the |
| | | 50 | | /// <c>redelivered</c> flag. A message seen for the first time is attempt 1. |
| | | 51 | | /// </summary> |
| | | 52 | | internal static int ResolveDeliveryAttempt(RabbitMqDelivery delivery) |
| | | 53 | | { |
| | | 54 | | var priorAttempts = Math.Max(ReadDeathCount(delivery.BasicProperties), delivery.Redelivered ? 1L : 0L); |
| | | 55 | | var attempt = priorAttempts + 1; |
| | | 56 | | return attempt > int.MaxValue ? int.MaxValue : (int)attempt; |
| | | 57 | | } |
| | | 58 | | |
| | | 59 | | private static long ReadDeathCount(IReadOnlyBasicProperties properties) |
| | | 60 | | { |
| | | 61 | | if (properties.Headers is null |
| | | 62 | | || !properties.Headers.TryGetValue("x-death", out var raw) |
| | | 63 | | || raw is not IEnumerable entries) |
| | | 64 | | { |
| | | 65 | | return 0; |
| | | 66 | | } |
| | | 67 | | |
| | | 68 | | long max = 0; |
| | | 69 | | foreach (var entry in entries) |
| | | 70 | | { |
| | | 71 | | if (entry is not IDictionary fields || !fields.Contains("count") || fields["count"] is not { } countValue) |
| | | 72 | | continue; |
| | | 73 | | |
| | | 74 | | try |
| | | 75 | | { |
| | | 76 | | max = Math.Max(max, Convert.ToInt64(countValue)); |
| | | 77 | | } |
| | | 78 | | catch (Exception ex) when (ex is FormatException or InvalidCastException or OverflowException) |
| | | 79 | | { |
| | | 80 | | // Ignore malformed x-death entries; fall back to the redelivered flag. |
| | | 81 | | } |
| | | 82 | | } |
| | | 83 | | |
| | | 84 | | return max; |
| | | 85 | | } |
| | | 86 | | |
| | | 87 | | /// <summary>Creates the configured dispatcher.</summary> |
| | | 88 | | public static RabbitMqMessageDispatcher Create( |
| | | 89 | | Func<RabbitMqDelivery, CancellationToken, Task> handler, |
| | | 90 | | RabbitMqAsyncResponseOptions transportOptions, |
| | | 91 | | RabbitMqSubscriberOptions subscriberOptions, |
| | | 92 | | ILogger logger, |
| | | 93 | | string queue, |
| | | 94 | | RabbitMqSubscriberRole role) |
| | | 95 | | { |
| | | 96 | | ValidateOptions(transportOptions, subscriberOptions, role); |
| | | 97 | | |
| | | 98 | | return subscriberOptions.AckMode == RabbitMqAckMode.AckAfterHandlerCompletes |
| | | 99 | | ? new AwaitingRabbitMqMessageDispatcher( |
| | | 100 | | handler, |
| | | 101 | | transportOptions, |
| | | 102 | | subscriberOptions, |
| | | 103 | | logger, |
| | | 104 | | queue, |
| | | 105 | | role) |
| | | 106 | | : new QueuedRabbitMqMessageDispatcher( |
| | | 107 | | handler, |
| | | 108 | | transportOptions, |
| | | 109 | | subscriberOptions, |
| | | 110 | | logger, |
| | | 111 | | queue, |
| | | 112 | | role); |
| | | 113 | | } |
| | | 114 | | |
| | | 115 | | /// <summary>Validates the supplied options.</summary> |
| | | 116 | | public static void ValidateOptions( |
| | | 117 | | RabbitMqAsyncResponseOptions transportOptions, |
| | | 118 | | RabbitMqSubscriberOptions subscriberOptions, |
| | | 119 | | RabbitMqSubscriberRole role) |
| | | 120 | | { |
| | | 121 | | var optionPath = role is RabbitMqSubscriberRole.Worker |
| | | 122 | | ? $"{nameof(RabbitMqAsyncResponseOptions)}.{nameof(RabbitMqAsyncResponseOptions.WorkerSubscriber)}" |
| | | 123 | | : $"{nameof(RabbitMqAsyncResponseOptions)}.{nameof(RabbitMqAsyncResponseOptions.ResponseSubscriber)}"; |
| | | 124 | | |
| | | 125 | | if (StringComparer.Ordinal.Equals(transportOptions.WorkerQueue, transportOptions.ResponseQueue)) |
| | | 126 | | { |
| | | 127 | | throw new InvalidOperationException( |
| | | 128 | | $"{nameof(RabbitMqAsyncResponseOptions)}.{nameof(RabbitMqAsyncResponseOptions.WorkerQueue)} and " + |
| | | 129 | | $"{nameof(RabbitMqAsyncResponseOptions.ResponseQueue)} must be distinct so worker and response subscribe |
| | | 130 | | } |
| | | 131 | | |
| | | 132 | | if (subscriberOptions.PrefetchCount == 0) |
| | | 133 | | throw new InvalidOperationException($"{optionPath}.{nameof(RabbitMqSubscriberOptions.PrefetchCount)} must be |
| | | 134 | | |
| | | 135 | | switch (subscriberOptions.AckMode) |
| | | 136 | | { |
| | | 137 | | case RabbitMqAckMode.AckAfterHandlerCompletes: |
| | | 138 | | return; |
| | | 139 | | |
| | | 140 | | case RabbitMqAckMode.AckAfterEnqueue: |
| | | 141 | | if (subscriberOptions.BackgroundWorkerCount <= 0) |
| | | 142 | | { |
| | | 143 | | throw new InvalidOperationException( |
| | | 144 | | $"{optionPath}.{nameof(RabbitMqSubscriberOptions.BackgroundWorkerCount)} must be explicitly conf |
| | | 145 | | $"when {nameof(RabbitMqSubscriberOptions.AckMode)} is {nameof(RabbitMqAckMode.AckAfterEnqueue)}. |
| | | 146 | | } |
| | | 147 | | |
| | | 148 | | if (subscriberOptions.BackgroundQueueCapacity <= 0) |
| | | 149 | | { |
| | | 150 | | throw new InvalidOperationException( |
| | | 151 | | $"{optionPath}.{nameof(RabbitMqSubscriberOptions.BackgroundQueueCapacity)} must be explicitly co |
| | | 152 | | $"when {nameof(RabbitMqSubscriberOptions.AckMode)} is {nameof(RabbitMqAckMode.AckAfterEnqueue)}. |
| | | 153 | | } |
| | | 154 | | |
| | | 155 | | if (subscriberOptions.BackgroundDrainTimeout <= TimeSpan.Zero) |
| | | 156 | | throw new InvalidOperationException($"{optionPath}.{nameof(RabbitMqSubscriberOptions.BackgroundDrain |
| | | 157 | | |
| | | 158 | | if (transportOptions.ShutdownTimeout <= TimeSpan.Zero) |
| | | 159 | | throw new InvalidOperationException($"{nameof(RabbitMqAsyncResponseOptions)}.{nameof(RabbitMqAsyncRe |
| | | 160 | | |
| | | 161 | | // RabbitMQ spends the background drain plus the bounded connection close |
| | | 162 | | // (ShutdownTimeout) at shutdown; both must fit inside the host budget. |
| | | 163 | | ShutdownBudgetValidator.Validate( |
| | | 164 | | "RabbitMQ", |
| | | 165 | | $"{nameof(RabbitMqAsyncResponseOptions)}.{nameof(RabbitMqAsyncResponseOptions.HostShutdownTimeout)}" |
| | | 166 | | transportOptions.HostShutdownTimeout, |
| | | 167 | | ($"{optionPath}.{nameof(RabbitMqSubscriberOptions.BackgroundDrainTimeout)}", subscriberOptions.Backg |
| | | 168 | | ($"{nameof(RabbitMqAsyncResponseOptions)}.{nameof(RabbitMqAsyncResponseOptions.ShutdownTimeout)}", t |
| | | 169 | | |
| | | 170 | | return; |
| | | 171 | | |
| | | 172 | | default: |
| | | 173 | | throw new InvalidOperationException( |
| | | 174 | | $"{optionPath}.{nameof(RabbitMqSubscriberOptions.AckMode)} has unsupported value '{subscriberOptions |
| | | 175 | | } |
| | | 176 | | } |
| | | 177 | | |
| | | 178 | | /// <summary>Handles the delivered message.</summary> |
| | | 179 | | public abstract Task HandleAsync( |
| | | 180 | | RabbitMqDelivery delivery, |
| | | 181 | | IRabbitMqChannel channel, |
| | | 182 | | CancellationToken subscriberCancellationToken); |
| | | 183 | | |
| | | 184 | | /// <summary>Releases resources held by this instance.</summary> |
| | | 185 | | public virtual ValueTask DisposeAsync() => ValueTask.CompletedTask; |
| | | 186 | | |
| | | 187 | | /// <summary>Runs the ExecuteHandlerAsync operation.</summary> |
| | | 188 | | protected async Task ExecuteHandlerAsync( |
| | | 189 | | RabbitMqDelivery delivery, |
| | | 190 | | CancellationToken cancellationToken, |
| | | 191 | | bool logFailures = true) |
| | | 192 | | { |
| | | 193 | | using var activity = AsyncResponseDiagnostics.StartActivity( |
| | | 194 | | "asyncresponse.rabbitmq.receive", |
| | | 195 | | ActivityKind.Consumer); |
| | | 196 | | activity?.SetTag("asyncresponse.transport", "rabbitmq"); |
| | | 197 | | activity?.SetTag("asyncresponse.rabbitmq.role", _role.ToString()); |
| | | 198 | | activity?.SetTag("asyncresponse.rabbitmq.ack_mode", _subscriberOptions.AckMode.ToString()); |
| | | 199 | | activity?.SetTag("messaging.system", "rabbitmq"); |
| | | 200 | | activity?.SetTag("messaging.destination.name", _queue); |
| | | 201 | | activity?.SetTag("messaging.rabbitmq.exchange", delivery.Exchange); |
| | | 202 | | activity?.SetTag("messaging.rabbitmq.routing_key", delivery.RoutingKey); |
| | | 203 | | activity?.SetTag("messaging.rabbitmq.delivery_tag", delivery.DeliveryTag); |
| | | 204 | | activity?.SetTag("messaging.message.id", delivery.BasicProperties.MessageId); |
| | | 205 | | |
| | | 206 | | if (!string.IsNullOrWhiteSpace(delivery.BasicProperties.CorrelationId)) |
| | | 207 | | AsyncResponseDiagnostics.SetCorrelationId(activity, delivery.BasicProperties.CorrelationId); |
| | | 208 | | |
| | | 209 | | try |
| | | 210 | | { |
| | | 211 | | await _handler(delivery, cancellationToken).ConfigureAwait(false); |
| | | 212 | | } |
| | | 213 | | catch (Exception ex) |
| | | 214 | | { |
| | | 215 | | if (logFailures) |
| | | 216 | | Logger.LogError(ex, "RabbitMQ message handling failed for delivery {DeliveryTag}.", delivery.DeliveryTag |
| | | 217 | | AsyncResponseDiagnostics.SetError(activity, ex); |
| | | 218 | | throw; |
| | | 219 | | } |
| | | 220 | | } |
| | | 221 | | |
| | | 222 | | /// <summary>Runs the NotifyBackgroundFailureAsync operation.</summary> |
| | | 223 | | protected async ValueTask NotifyBackgroundFailureAsync( |
| | | 224 | | RabbitMqDelivery delivery, |
| | | 225 | | Exception exception, |
| | | 226 | | string queue, |
| | | 227 | | RabbitMqSubscriberRole role) |
| | | 228 | | { |
| | | 229 | | var callback = _subscriberOptions.OnBackgroundFailure; |
| | | 230 | | if (callback is null) |
| | | 231 | | return; |
| | | 232 | | |
| | | 233 | | try |
| | | 234 | | { |
| | | 235 | | await callback(new RabbitMqBackgroundFailureContext( |
| | | 236 | | queue, |
| | | 237 | | role.ToString(), |
| | | 238 | | delivery.Exchange, |
| | | 239 | | delivery.RoutingKey, |
| | | 240 | | delivery.DeliveryTag, |
| | | 241 | | exception)).ConfigureAwait(false); |
| | | 242 | | } |
| | | 243 | | catch (Exception callbackException) |
| | | 244 | | { |
| | | 245 | | Logger.LogError( |
| | | 246 | | callbackException, |
| | | 247 | | "RabbitMQ background failure callback failed for already-ACKed delivery {DeliveryTag} on {Queue}.", |
| | | 248 | | delivery.DeliveryTag, |
| | | 249 | | queue); |
| | | 250 | | } |
| | | 251 | | } |
| | | 252 | | } |
| | | 253 | | |
| | | 254 | | internal sealed class AwaitingRabbitMqMessageDispatcher( |
| | | 255 | | Func<RabbitMqDelivery, CancellationToken, Task> handler, |
| | | 256 | | RabbitMqAsyncResponseOptions transportOptions, |
| | | 257 | | RabbitMqSubscriberOptions subscriberOptions, |
| | | 258 | | ILogger logger, |
| | | 259 | | string queue, |
| | | 260 | | RabbitMqSubscriberRole role) |
| | | 261 | | : RabbitMqMessageDispatcher(handler, transportOptions, subscriberOptions, logger, queue, role) |
| | | 262 | | { |
| | | 263 | | /// <summary>Handles the delivered message.</summary> |
| | | 264 | | public override async Task HandleAsync( |
| | | 265 | | RabbitMqDelivery delivery, |
| | | 266 | | IRabbitMqChannel channel, |
| | | 267 | | CancellationToken subscriberCancellationToken) |
| | | 268 | | { |
| | | 269 | | try |
| | | 270 | | { |
| | | 271 | | await ExecuteHandlerAsync(delivery, subscriberCancellationToken).ConfigureAwait(false); |
| | | 272 | | await channel.BasicAckAsync(delivery.DeliveryTag, subscriberCancellationToken).ConfigureAwait(false); |
| | | 273 | | } |
| | | 274 | | catch |
| | | 275 | | { |
| | | 276 | | // Requeue for redelivery, unless a delivery cap is configured and this delivery has reached it — |
| | | 277 | | // then reject without requeue so the broker dead-letters (or drops) it instead of hot-looping. |
| | | 278 | | var requeue = MaxDeliveryAttempts <= 0 |
| | | 279 | | || ResolveDeliveryAttempt(delivery) < MaxDeliveryAttempts; |
| | | 280 | | await channel.BasicNackAsync(delivery.DeliveryTag, requeue, CancellationToken.None).ConfigureAwait(false); |
| | | 281 | | } |
| | | 282 | | } |
| | | 283 | | } |
| | | 284 | | |
| | | 285 | | internal sealed class QueuedRabbitMqMessageDispatcher : RabbitMqMessageDispatcher |
| | | 286 | | { |
| | | 287 | | private readonly Channel<RabbitMqDelivery> _queue; |
| | | 288 | | private readonly Task[] _workers; |
| | 3 | 289 | | private readonly CancellationTokenSource _drainCancellation = new(); |
| | | 290 | | private readonly TimeSpan _drainTimeout; |
| | | 291 | | private readonly string _queueName; |
| | | 292 | | private readonly RabbitMqSubscriberRole _role; |
| | | 293 | | private int _pendingCount; |
| | | 294 | | private int _runningCount; |
| | | 295 | | private int _disposeStarted; |
| | | 296 | | |
| | | 297 | | /// <summary>Runs the QueuedRabbitMqMessageDispatcher operation.</summary> |
| | | 298 | | public QueuedRabbitMqMessageDispatcher( |
| | | 299 | | Func<RabbitMqDelivery, CancellationToken, Task> handler, |
| | | 300 | | RabbitMqAsyncResponseOptions transportOptions, |
| | | 301 | | RabbitMqSubscriberOptions subscriberOptions, |
| | | 302 | | ILogger logger, |
| | | 303 | | string queue, |
| | | 304 | | RabbitMqSubscriberRole role) |
| | 3 | 305 | | : base(handler, transportOptions, subscriberOptions, logger, queue, role) |
| | | 306 | | { |
| | 3 | 307 | | _drainTimeout = subscriberOptions.BackgroundDrainTimeout; |
| | 3 | 308 | | _queueName = queue; |
| | 3 | 309 | | _role = role; |
| | 3 | 310 | | _queue = Channel.CreateBounded<RabbitMqDelivery>(new BoundedChannelOptions(subscriberOptions.BackgroundQueueCapa |
| | 3 | 311 | | { |
| | 3 | 312 | | AllowSynchronousContinuations = false, |
| | 3 | 313 | | FullMode = BoundedChannelFullMode.Wait, |
| | 3 | 314 | | SingleReader = subscriberOptions.BackgroundWorkerCount == 1, |
| | 3 | 315 | | SingleWriter = false |
| | 3 | 316 | | }); |
| | | 317 | | |
| | 3 | 318 | | _workers = Enumerable.Range(0, subscriberOptions.BackgroundWorkerCount) |
| | 3 | 319 | | .Select(workerIndex => Task.Run(() => RunWorkerAsync(workerIndex))) |
| | 3 | 320 | | .ToArray(); |
| | | 321 | | |
| | 3 | 322 | | Logger.LogInformation( |
| | 3 | 323 | | "Created RabbitMQ ACK-after-enqueue dispatcher for {Queue} with {WorkerCount} worker(s), queue capacity {Que |
| | 3 | 324 | | _queueName, |
| | 3 | 325 | | subscriberOptions.BackgroundWorkerCount, |
| | 3 | 326 | | subscriberOptions.BackgroundQueueCapacity, |
| | 3 | 327 | | _drainTimeout); |
| | 3 | 328 | | } |
| | | 329 | | |
| | 3 | 330 | | internal int PendingCount => Volatile.Read(ref _pendingCount); |
| | 3 | 331 | | internal int RunningCount => Volatile.Read(ref _runningCount); |
| | | 332 | | |
| | | 333 | | /// <summary>Handles the delivered message.</summary> |
| | | 334 | | public override async Task HandleAsync( |
| | | 335 | | RabbitMqDelivery delivery, |
| | | 336 | | IRabbitMqChannel channel, |
| | | 337 | | CancellationToken subscriberCancellationToken) |
| | | 338 | | { |
| | | 339 | | // The client owns the delivery body's memory only until the consumer callback returns |
| | | 340 | | // ("Accessing the body at a later point is unsafe as its memory can be already |
| | | 341 | | // released" — RabbitMQ.Client v7). This dispatcher hands the delivery to background |
| | | 342 | | // workers that read the body after the callback, so materialize a private copy now. |
| | | 343 | | // The awaiting dispatcher consumes the body inside the callback and stays zero-copy. |
| | 3 | 344 | | delivery = delivery with { Body = delivery.Body.ToArray() }; |
| | | 345 | | |
| | 3 | 346 | | Interlocked.Increment(ref _pendingCount); |
| | 3 | 347 | | if (!_queue.Writer.TryWrite(delivery)) |
| | | 348 | | { |
| | 2 | 349 | | Interlocked.Decrement(ref _pendingCount); |
| | 2 | 350 | | Logger.LogWarning( |
| | 2 | 351 | | "RabbitMQ background queue rejected delivery {DeliveryTag} for {Queue}; returning NACK. Pending={Pending |
| | 2 | 352 | | delivery.DeliveryTag, |
| | 2 | 353 | | _queueName, |
| | 2 | 354 | | PendingCount, |
| | 2 | 355 | | RunningCount); |
| | 2 | 356 | | await channel.BasicNackAsync(delivery.DeliveryTag, requeue: true, subscriberCancellationToken).ConfigureAwai |
| | 3 | 357 | | return; |
| | | 358 | | } |
| | | 359 | | |
| | | 360 | | // The delivery now belongs to a background worker, which decrements _pendingCount when it dequeues. |
| | | 361 | | // Do not touch the counter or NACK here, even if the ACK below fails — the message is already |
| | | 362 | | // executing in-process and a NACK would trigger a duplicate execution via requeue. |
| | | 363 | | try |
| | | 364 | | { |
| | 3 | 365 | | await channel.BasicAckAsync(delivery.DeliveryTag, subscriberCancellationToken).ConfigureAwait(false); |
| | 3 | 366 | | } |
| | 2 | 367 | | catch (Exception ex) |
| | | 368 | | { |
| | 2 | 369 | | Logger.LogError( |
| | 2 | 370 | | ex, |
| | 2 | 371 | | "Failed to ACK RabbitMQ delivery {DeliveryTag} for {Queue} after enqueue; it is being processed but the |
| | 2 | 372 | | delivery.DeliveryTag, |
| | 2 | 373 | | _queueName); |
| | 3 | 374 | | } |
| | 3 | 375 | | } |
| | | 376 | | |
| | | 377 | | /// <summary>Releases resources held by this instance.</summary> |
| | | 378 | | public override async ValueTask DisposeAsync() |
| | | 379 | | { |
| | 3 | 380 | | if (Interlocked.Exchange(ref _disposeStarted, 1) != 0) |
| | 3 | 381 | | return; |
| | | 382 | | |
| | 3 | 383 | | Logger.LogInformation( |
| | 3 | 384 | | "Draining RabbitMQ ACK-after-enqueue dispatcher for {Queue}. Pending={PendingCount}, Running={RunningCount}. |
| | 3 | 385 | | _queueName, |
| | 3 | 386 | | PendingCount, |
| | 3 | 387 | | RunningCount); |
| | 3 | 388 | | _queue.Writer.TryComplete(); |
| | | 389 | | |
| | | 390 | | try |
| | | 391 | | { |
| | 3 | 392 | | await Task.WhenAll(_workers).WaitAsync(_drainTimeout).ConfigureAwait(false); |
| | 3 | 393 | | _drainCancellation.Dispose(); |
| | 3 | 394 | | } |
| | 2 | 395 | | catch (TimeoutException ex) |
| | | 396 | | { |
| | 2 | 397 | | _drainCancellation.Cancel(); |
| | 2 | 398 | | Logger.LogWarning( |
| | 2 | 399 | | ex, |
| | 2 | 400 | | "Timed out while draining RabbitMQ ACK-after-enqueue dispatcher for {Queue}. Pending={PendingCount}, Run |
| | 2 | 401 | | _queueName, |
| | 2 | 402 | | PendingCount, |
| | 2 | 403 | | RunningCount); |
| | | 404 | | |
| | | 405 | | // The workers are still running and read _drainCancellation.Token each loop, so disposing it now |
| | | 406 | | // would throw ObjectDisposedException inside them. Dispose once they actually finish, off the |
| | | 407 | | // shutdown path, so the source is not leaked either. |
| | 2 | 408 | | _ = Task.WhenAll(_workers).ContinueWith( |
| | 3 | 409 | | _ => _drainCancellation.Dispose(), |
| | 2 | 410 | | CancellationToken.None, |
| | 2 | 411 | | TaskContinuationOptions.ExecuteSynchronously, |
| | 2 | 412 | | TaskScheduler.Default); |
| | 3 | 413 | | } |
| | 3 | 414 | | } |
| | | 415 | | |
| | | 416 | | private async Task RunWorkerAsync(int workerIndex) |
| | | 417 | | { |
| | 3 | 418 | | await foreach (var delivery in _queue.Reader.ReadAllAsync().ConfigureAwait(false)) |
| | | 419 | | { |
| | 3 | 420 | | Interlocked.Decrement(ref _pendingCount); |
| | 3 | 421 | | Interlocked.Increment(ref _runningCount); |
| | | 422 | | |
| | | 423 | | try |
| | | 424 | | { |
| | 3 | 425 | | await ExecuteHandlerAsync( |
| | 3 | 426 | | delivery, |
| | 3 | 427 | | _drainCancellation.Token, |
| | 3 | 428 | | logFailures: false).ConfigureAwait(false); |
| | 3 | 429 | | } |
| | 3 | 430 | | catch (Exception ex) |
| | | 431 | | { |
| | 2 | 432 | | Logger.LogError( |
| | 2 | 433 | | ex, |
| | 2 | 434 | | "RabbitMQ background handler failed for already-ACKed delivery {DeliveryTag} on {Queue}.", |
| | 2 | 435 | | delivery.DeliveryTag, |
| | 2 | 436 | | _queueName); |
| | 2 | 437 | | await NotifyBackgroundFailureAsync( |
| | 2 | 438 | | delivery, |
| | 2 | 439 | | ex, |
| | 2 | 440 | | _queueName, |
| | 2 | 441 | | _role).ConfigureAwait(false); |
| | | 442 | | } |
| | | 443 | | finally |
| | | 444 | | { |
| | 3 | 445 | | Interlocked.Decrement(ref _runningCount); |
| | | 446 | | } |
| | 3 | 447 | | } |
| | 3 | 448 | | } |
| | | 449 | | } |