219 lines
6.7 KiB
C#
219 lines
6.7 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.Common.Caching;
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[Singletone]
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public class RabbitMQCache<T> : IDisposable, ICacheNotify<T> where T : IMessage<T>, new()
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{
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private IConnection _connection;
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private readonly IConnectionFactory _connectionFactory;
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private IModel _consumerChannel;
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private readonly Guid _instanceId;
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private readonly string _exchangeName;
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private readonly string _queueName;
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private readonly ILogger _logger;
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private readonly ConcurrentDictionary<string, List<Action<T>>> _actions;
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private readonly object _lock = new object();
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private bool _disposed;
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public RabbitMQCache(IConfiguration configuration, ILogger<RabbitMQCache<T>> logger)
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{
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_logger = logger;
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_instanceId = Guid.NewGuid();
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_exchangeName = $"asc:cache_notify:event_bus:{typeof(T).FullName}";
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_queueName = $"asc:cache_notify:queue:{typeof(T).FullName}:{_instanceId}";
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_actions = new ConcurrentDictionary<string, List<Action<T>>>();
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var rabbitMQConfiguration = configuration.GetSection("rabbitmq").Get<RabbitMQSettings>();
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_connectionFactory = new ConnectionFactory
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{
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HostName = rabbitMQConfiguration.HostName,
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UserName = rabbitMQConfiguration.UserName,
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Password = rabbitMQConfiguration.Password
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};
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_connection = _connectionFactory.CreateConnection();
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_consumerChannel = CreateConsumerChannel();
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StartBasicConsume();
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}
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private IModel CreateConsumerChannel()
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{
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TryConnect();
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_logger.TraceCreatingRabbitMQ();
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var channel = _connection.CreateModel();
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channel.ExchangeDeclare(exchange: _exchangeName, type: ExchangeType.Fanout);
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channel.QueueDeclare(queue: _queueName,
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durable: false,
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exclusive: false,
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autoDelete: true,
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arguments: null);
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channel.QueueBind(_queueName, _exchangeName, string.Empty, null);
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channel.CallbackException += (sender, ea) =>
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{
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_logger.WarningRecreatingRabbitMQ(ea.Exception);
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_consumerChannel.Dispose();
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_consumerChannel = CreateConsumerChannel();
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StartBasicConsume();
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};
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return channel;
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}
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private void StartBasicConsume()
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{
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_logger.TraceStartingRabbitMQ();
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if (_consumerChannel != null)
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{
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var consumer = new EventingBasicConsumer(_consumerChannel);
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consumer.Received += OnMessageReceived;
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_consumerChannel.BasicConsume(queue: _queueName, autoAck: true, consumer: consumer);
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}
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else
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{
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_logger.ErrorStartBasicConsumeCanNotCall();
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}
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}
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private void TryConnect()
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{
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lock (_lock)
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{
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if (IsConnected)
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{
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return;
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}
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_connection = _connectionFactory.CreateConnection();
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_connection.ConnectionShutdown += (s, e) => TryConnect();
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_connection.CallbackException += (s, e) => TryConnect();
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_connection.ConnectionBlocked += (s, e) => TryConnect();
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}
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}
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public bool IsConnected => _connection != null && _connection.IsOpen && !_disposed;
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private void OnMessageReceived(object sender, BasicDeliverEventArgs e)
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{
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var body = e.Body.Span.ToArray();
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var parser = new MessageParser<T>(() => new T());
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var data = body.Take(body.Length - 1);
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var obj = parser.ParseFrom(data.ToArray());
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var action = (CacheNotifyAction)body[body.Length - 1];
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if (_actions.TryGetValue(GetKey(action), out var onchange) && onchange != null)
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{
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Parallel.ForEach(onchange, a => a(obj));
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}
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}
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public void Publish(T obj, CacheNotifyAction action)
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{
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var objAsByteArray = obj.ToByteArray();
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var body = new byte[objAsByteArray.Length + 1];
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objAsByteArray.CopyTo(body, 0);
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body[body.Length - 1] = (byte)action;
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_consumerChannel.BasicPublish(
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exchange: _exchangeName,
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routingKey: string.Empty,
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mandatory: true,
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basicProperties: _consumerChannel.CreateBasicProperties(),
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body: body);
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}
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public Task PublishAsync(T obj, CacheNotifyAction action)
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{
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Publish(obj, action);
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return Task.CompletedTask;
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}
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public void Subscribe(Action<T> onchange, CacheNotifyAction action)
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{
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_actions.GetOrAdd(GetKey(action), new List<Action<T>>())
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.Add(onchange);
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}
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public void Unsubscribe(CacheNotifyAction action)
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{
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_actions.TryRemove(GetKey(action), out _);
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}
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private string GetKey(CacheNotifyAction cacheNotifyAction)
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{
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return $"asc:channel:{cacheNotifyAction}:{typeof(T).FullName}".ToLower();
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}
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public void Dispose()
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{
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if (_disposed)
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{
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return;
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}
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_consumerChannel?.Dispose();
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_connection.Dispose();
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_disposed = true;
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}
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}
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public class RabbitMQSettings
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{
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public string HostName { get; set; }
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public string UserName { get; set; }
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public string Password { get; set; }
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}
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