feat: finalize core modules and gateway

src/Modules/TakeoutSaaS.Module.Messaging/Services/RabbitMqMessagePublisher.cs

@@ -0,0 +1,66 @@
+using System;
+using System.Text;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using RabbitMQ.Client;
+using TakeoutSaaS.Module.Messaging.Abstractions;
+using TakeoutSaaS.Module.Messaging.Options;
+using TakeoutSaaS.Module.Messaging.Serialization;
+
+namespace TakeoutSaaS.Module.Messaging.Services;
+
+/// <summary>
+/// RabbitMQ 消息发布实现。
+/// </summary>
+public sealed class RabbitMqMessagePublisher(RabbitMqConnectionFactory connectionFactory, IOptionsMonitor<RabbitMqOptions> optionsMonitor, JsonMessageSerializer serializer, ILogger<RabbitMqMessagePublisher> logger)
+    : IMessagePublisher, IAsyncDisposable
+{
+    private IConnection? _connection;
+    private IModel? _channel;
+    private bool _disposed;
+
+    /// <inheritdoc />
+    public Task PublishAsync<T>(string routingKey, T message, CancellationToken cancellationToken = default)
+    {
+        EnsureChannel();
+        var options = optionsMonitor.CurrentValue;
+
+        _channel!.ExchangeDeclare(options.Exchange, options.ExchangeType, durable: true, autoDelete: false);
+        var body = serializer.Serialize(message);
+        var props = _channel.CreateBasicProperties();
+        props.ContentType = "application/json";
+        props.DeliveryMode = 2;
+        props.MessageId = Guid.NewGuid().ToString("N");
+
+        _channel.BasicPublish(options.Exchange, routingKey, props, body);
+        logger.LogDebug("发布消息到交换机 {Exchange} RoutingKey {RoutingKey}", options.Exchange, routingKey);
+        return Task.CompletedTask;
+    }
+
+    private void EnsureChannel()
+    {
+        if (_channel != null && _channel.IsOpen)
+        {
+            return;
+        }
+
+        _connection ??= connectionFactory.CreateConnection();
+        _channel = _connection.CreateModel();
+    }
+
+    /// <summary>
+    /// 释放 RabbitMQ 资源。
+    /// </summary>
+    public ValueTask DisposeAsync()
+    {
+        if (_disposed)
+        {
+            return ValueTask.CompletedTask;
+        }
+
+        _disposed = true;
+        _channel?.Dispose();
+        _connection?.Dispose();
+        return ValueTask.CompletedTask;
+    }
+}