// Admin.NET 项目的版权、商标、专利和其他相关权利均受相应法律法规的保护。使用本项目应遵守相关法律法规和许可证的要求。
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//
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// 本项目主要遵循 MIT 许可证和 Apache 许可证（版本 2.0）进行分发和使用。许可证位于源代码树根目录中的 LICENSE-MIT 和 LICENSE-APACHE 文件。
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//
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// 不得利用本项目从事危害国家安全、扰乱社会秩序、侵犯他人合法权益等法律法规禁止的活动！任何基于本项目二次开发而产生的一切法律纠纷和责任，我们不承担任何责任！
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using RabbitMQ.Client;
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using RabbitMQ.Client.Events;
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using System.Threading.Channels;
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namespace Admin.NET.Core;
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/// <summary>
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/// RabbitMQ自定义事件源存储器
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/// </summary>
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public class RabbitMQEventSourceStore : IEventSourceStorer, IDisposable
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{
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/// <summary>
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/// 内存通道事件源存储器
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/// </summary>
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private Channel<IEventSource> _channelEventSource;
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/// <summary>
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/// 路由键
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/// </summary>
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private string _routeKey;
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/// <summary>
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/// 连接对象
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/// </summary>
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private IConnection _connection;
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/// <summary>
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/// 通道对象
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/// </summary>
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private IChannel _channel;
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/// <summary>
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/// 构造函数
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/// </summary>
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/// <param name="factory">连接工厂</param>
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/// <param name="routeKey">路由键</param>
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/// <param name="capacity">存储器最多能够处理多少消息，超过该容量进入等待写入</param>
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public RabbitMQEventSourceStore(ConnectionFactory factory, string routeKey, int capacity)
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{
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InitEventSourceStore(factory, routeKey, capacity).GetAwaiter().GetResult();
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}
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/// <summary>
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/// 初始化事件源存储器
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/// </summary>
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/// <param name="factory">连接工厂</param>
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/// <param name="routeKey">路由键</param>
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/// <param name="capacity">存储器最多能够处理多少消息，超过该容量进入等待写入</param>
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private async Task InitEventSourceStore(ConnectionFactory factory, string routeKey, int capacity)
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{
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// 配置通道（超出默认容量后进入等待）
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var boundedChannelOptions = new BoundedChannelOptions(capacity)
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{
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FullMode = BoundedChannelFullMode.Wait
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};
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// 创建有限容量通道
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_channelEventSource = Channel.CreateBounded<IEventSource>(boundedChannelOptions);
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// 创建连接
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_connection = await factory.CreateConnectionAsync();
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// 路由键名
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_routeKey = routeKey;
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// 创建通道
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_channel = await _connection.CreateChannelAsync();
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// 声明路由队列
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await _channel.QueueDeclareAsync(routeKey, false, false, false, null);
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// 创建消息订阅者
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var consumer = new AsyncEventingBasicConsumer(_channel);
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// 订阅消息并写入内存 Channel
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consumer.ReceivedAsync += async (ch, ea) =>
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{
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// 读取原始消息
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var stringEventSource = Encoding.UTF8.GetString(ea.Body.ToArray());
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// 转换为 IEventSource，如果自定义了 EventSource，注意属性是可读可写
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var eventSource = JSON.Deserialize<ChannelEventSource>(stringEventSource);
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// 写入内存管道存储器
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await _channelEventSource.Writer.WriteAsync(eventSource);
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// 确认该消息已被消费
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await _channel.BasicAckAsync(ea.DeliveryTag, false);
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};
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// 启动消费者且设置为手动应答消息
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await _channel.BasicConsumeAsync(routeKey, false, consumer);
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}
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/// <summary>
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/// 将事件源写入存储器
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/// </summary>
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/// <param name="eventSource">事件源对象</param>
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/// <param name="cancellationToken">取消任务 Token</param>
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/// <returns><see cref="ValueTask"/></returns>
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public async ValueTask WriteAsync(IEventSource eventSource, CancellationToken cancellationToken)
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{
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if (eventSource == default)
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throw new ArgumentNullException(nameof(eventSource));
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// 判断是否是 ChannelEventSource 或自定义的 EventSource
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if (eventSource is ChannelEventSource source)
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{
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// 序列化及发布
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var data = Encoding.UTF8.GetBytes(JSON.Serialize(source));
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var props = new BasicProperties();
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props.ContentType = "text/plain";
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props.DeliveryMode = DeliveryModes.Persistent;
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await _channel.BasicPublishAsync("", _routeKey, false, props, data);
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}
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else
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{
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// 处理动态订阅
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await _channelEventSource.Writer.WriteAsync(eventSource, cancellationToken);
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}
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}
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/// <summary>
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/// 从存储器中读取一条事件源
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/// </summary>
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/// <param name="cancellationToken">取消任务 Token</param>
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/// <returns>事件源对象</returns>
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public async ValueTask<IEventSource> ReadAsync(CancellationToken cancellationToken)
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{
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var eventSource = await _channelEventSource.Reader.ReadAsync(cancellationToken);
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return eventSource;
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}
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/// <summary>
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/// 释放非托管资源
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/// </summary>
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public void Dispose()
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{
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_channel.Dispose();
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_connection.Dispose();
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}
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}
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