363 lines
12 KiB
C#
363 lines
12 KiB
C#
// (c) Copyright Ascensio System SIA 2010-2022
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//
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// This program is a free software product.
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// You can redistribute it and/or modify it under the terms
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// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
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// Foundation. In accordance with Section 7(a) of the GNU AGPL its Section 15 shall be amended
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// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
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// any third-party rights.
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//
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// This program is distributed WITHOUT ANY WARRANTY, without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For details, see
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// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
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//
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// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
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//
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// The interactive user interfaces in modified source and object code versions of the Program must
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// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
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//
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// Pursuant to Section 7(b) of the License you must retain the original Product logo when
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// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
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// trademark law for use of our trademarks.
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//
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// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
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// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
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// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
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namespace ASC.EventBus.ActiveMQ;
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public class EventBusActiveMQ : IEventBus, IDisposable
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{
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const string EXCHANGE_NAME = "asc_event_bus";
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const string AUTOFAC_SCOPE_NAME = "asc_event_bus";
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private readonly ILogger<EventBusActiveMQ> _logger;
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private readonly IEventBusSubscriptionsManager _subsManager;
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private readonly ILifetimeScope _autofac;
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private static ConcurrentQueue<Guid> _rejectedEvents;
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private readonly IActiveMQPersistentConnection _persistentConnection;
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private readonly IIntegrationEventSerializer _serializer;
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private ISession _consumerSession;
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private readonly List<IMessageConsumer> _consumers;
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private readonly int _retryCount;
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private string _queueName;
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public EventBusActiveMQ(IActiveMQPersistentConnection persistentConnection,
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ILogger<EventBusActiveMQ> logger,
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ILifetimeScope autofac,
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IEventBusSubscriptionsManager subsManager,
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IIntegrationEventSerializer serializer,
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string queueName = null,
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int retryCount = 5)
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{
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_persistentConnection = persistentConnection ?? throw new ArgumentNullException(nameof(persistentConnection));
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_logger = logger ?? throw new ArgumentNullException(nameof(logger));
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_subsManager = subsManager ?? new InMemoryEventBusSubscriptionsManager();
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_serializer = serializer;
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_queueName = queueName;
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_autofac = autofac;
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_retryCount = retryCount;
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_rejectedEvents = new ConcurrentQueue<Guid>();
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_consumerSession = CreateConsumerSession();
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_subsManager.OnEventRemoved += SubsManager_OnEventRemoved;
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_consumers = new List<IMessageConsumer>();
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}
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private void SubsManager_OnEventRemoved(object sender, string eventName)
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{
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if (!_persistentConnection.IsConnected)
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{
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_persistentConnection.TryConnect();
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}
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using (var session = _persistentConnection.CreateSession())
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{
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var messageSelector = $"eventName='{eventName}'";
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var findedConsumer = _consumers.Find(x => x.MessageSelector == messageSelector);
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if (findedConsumer != null)
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{
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findedConsumer.Close();
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_consumers.Remove(findedConsumer);
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}
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if (_subsManager.IsEmpty)
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{
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_queueName = string.Empty;
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_consumerSession.Close();
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}
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}
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}
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public void Publish(IntegrationEvent @event)
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{
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if (!_persistentConnection.IsConnected)
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{
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_persistentConnection.TryConnect();
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}
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var policy = Policy.Handle<SocketException>()
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.WaitAndRetry(_retryCount, retryAttempt => TimeSpan.FromSeconds(Math.Pow(2, retryAttempt)), (ex, time) =>
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{
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_logger.WarningCouldNotPublishEvent(@event.Id, time.TotalSeconds, ex);
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});
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using (var session = _persistentConnection.CreateSession(AcknowledgementMode.ClientAcknowledge))
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{
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var destination = session.GetQueue(_queueName);
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using (var producer = session.CreateProducer(destination))
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{
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producer.DeliveryMode = MsgDeliveryMode.Persistent;
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var body = _serializer.Serialize(@event);
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var request = session.CreateStreamMessage();
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var eventName = @event.GetType().Name;
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request.Properties["eventName"] = eventName;
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request.WriteBytes(body);
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producer.Send(request);
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}
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}
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}
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public void Subscribe<T, TH>()
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where T : IntegrationEvent
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where TH : IIntegrationEventHandler<T>
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{
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var eventName = _subsManager.GetEventKey<T>();
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_logger.InformationSubscribing(eventName, typeof(TH).GetGenericTypeName());
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_subsManager.AddSubscription<T, TH>();
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StartBasicConsume(eventName);
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}
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public void SubscribeDynamic<TH>(string eventName) where TH : IDynamicIntegrationEventHandler
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{
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_logger.InformationSubscribingDynamic(eventName, typeof(TH).GetGenericTypeName());
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_subsManager.AddDynamicSubscription<TH>(eventName);
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StartBasicConsume(eventName);
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}
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private ISession CreateConsumerSession()
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{
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if (!_persistentConnection.IsConnected)
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{
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_persistentConnection.TryConnect();
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}
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_logger.TraceCreatingConsumerSession();
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_consumerSession = _persistentConnection.CreateSession(AcknowledgementMode.ClientAcknowledge);
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return _consumerSession;
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}
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private void StartBasicConsume(string eventName)
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{
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_logger.TraceStartingBasicConsume();
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if (!_persistentConnection.IsConnected)
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{
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_persistentConnection.TryConnect();
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}
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var destination = _consumerSession.GetQueue(_queueName);
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var messageSelector = $"eventName='{eventName}'";
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var consumer = _consumerSession.CreateConsumer(destination, messageSelector);
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_consumers.Add(consumer);
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if (_consumerSession != null)
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{
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consumer.Listener += Consumer_Listener;
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}
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else
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{
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_logger.ErrorStartBasicConsumeCantCall();
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}
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}
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private void Consumer_Listener(IMessage objMessage)
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{
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var streamMessage = objMessage as IStreamMessage;
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var eventName = streamMessage.Properties["eventName"].ToString();
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var buffer = new byte[4 * 1024];
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byte[] serializedMessage;
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using (var ms = new MemoryStream())
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{
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int read;
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while ((read = streamMessage.ReadBytes(buffer)) > 0)
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{
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ms.Write(buffer, 0, read);
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if (read < buffer.Length)
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{
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break;
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}
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}
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serializedMessage = ms.ToArray();
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}
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var @event = GetEvent(eventName, serializedMessage);
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var message = @event.ToString();
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try
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{
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if (message.ToLowerInvariant().Contains("throw-fake-exception"))
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{
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throw new InvalidOperationException($"Fake exception requested: \"{message}\"");
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}
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ProcessEvent(eventName, @event)
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.GetAwaiter()
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.GetResult();
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streamMessage.Acknowledge();
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}
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catch (IntegrationEventRejectExeption ex)
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{
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_logger.WarningProcessingMessage(message, ex);
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if (_rejectedEvents.TryPeek(out var result) && result.Equals(ex.EventId))
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{
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_rejectedEvents.TryDequeue(out var _);
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streamMessage.Acknowledge();
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}
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else
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{
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_rejectedEvents.Enqueue(ex.EventId);
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}
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}
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catch (Exception ex)
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{
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_logger.WarningProcessingMessage(message, ex);
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streamMessage.Acknowledge();
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}
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}
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private IntegrationEvent GetEvent(string eventName, byte[] serializedMessage)
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{
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var eventType = _subsManager.GetEventTypeByName(eventName);
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var integrationEvent = (IntegrationEvent)_serializer.Deserialize(serializedMessage, eventType);
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return integrationEvent;
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}
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public void Unsubscribe<T, TH>()
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where T : IntegrationEvent
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where TH : IIntegrationEventHandler<T>
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{
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var eventName = _subsManager.GetEventKey<T>();
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_logger.InformationUnsubscribing(eventName);
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_subsManager.RemoveSubscription<T, TH>();
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}
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public void UnsubscribeDynamic<TH>(string eventName) where TH : IDynamicIntegrationEventHandler
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{
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_subsManager.RemoveDynamicSubscription<TH>(eventName);
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}
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private void PreProcessEvent(IntegrationEvent @event)
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{
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if (_rejectedEvents.Count == 0)
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{
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return;
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}
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if (_rejectedEvents.TryPeek(out var result) && result.Equals(@event.Id))
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{
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@event.Redelivered = true;
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}
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}
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private async Task ProcessEvent(string eventName, IntegrationEvent @event)
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{
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_logger.TraceProcessingEvent(eventName);
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PreProcessEvent(@event);
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if (_subsManager.HasSubscriptionsForEvent(eventName))
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{
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using (var scope = _autofac.BeginLifetimeScope(AUTOFAC_SCOPE_NAME))
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{
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var subscriptions = _subsManager.GetHandlersForEvent(eventName);
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foreach (var subscription in subscriptions)
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{
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if (subscription.IsDynamic)
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{
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var handler = scope.ResolveOptional(subscription.HandlerType) as IDynamicIntegrationEventHandler;
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if (handler == null)
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{
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continue;
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}
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using dynamic eventData = @event;
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await Task.Yield();
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await handler.Handle(eventData);
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}
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else
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{
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var handler = scope.ResolveOptional(subscription.HandlerType);
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if (handler == null)
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{
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continue;
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}
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var eventType = _subsManager.GetEventTypeByName(eventName);
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var concreteType = typeof(IIntegrationEventHandler<>).MakeGenericType(eventType);
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await Task.Yield();
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await (Task)concreteType.GetMethod("Handle").Invoke(handler, new object[] { @event });
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}
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}
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}
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}
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else
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{
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_logger.WarningNoSubscription(eventName);
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}
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}
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public void Dispose()
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{
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foreach (var consumer in _consumers)
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{
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consumer.Dispose();
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}
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if (_consumerSession != null)
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{
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_consumerSession.Dispose();
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}
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_subsManager.Clear();
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}
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} |