78 lines
3.3 KiB
C#
78 lines
3.3 KiB
C#
using System;
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using System.Diagnostics;
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using System.Reflection;
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using System.Threading.Tasks;
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using RabbitMQ.Client.Framing;
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using Tapeti.Annotations;
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using Tapeti.Config;
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using Tapeti.Helpers;
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namespace Tapeti.Default
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{
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public class PublishResultBinding : IBindingMiddleware
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{
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public void Handle(IBindingContext context, Action next)
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{
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next();
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if (context.Result.HasHandler)
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return;
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var hasClassResult = context.Result.Info.ParameterType.IsTypeOrTaskOf(t => t.IsClass, out var isTaskOf, out var actualType);
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var request = context.MessageClass?.GetCustomAttribute<RequestAttribute>();
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var expectedClassResult = request?.Response;
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// Verify the return type matches with the Request attribute of the message class. This is a backwards incompatible change in
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// Tapeti 1.2: if you just want to publish another message as a result of the incoming message, explicitly call IPublisher.Publish.
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if (!hasClassResult && expectedClassResult != null || hasClassResult && expectedClassResult != actualType)
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throw new ArgumentException($"Message handler must return type {expectedClassResult?.FullName ?? "void"} in controller {context.Method.DeclaringType?.FullName}, method {context.Method.Name}, found: {actualType?.FullName ?? "void"}");
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if (!hasClassResult)
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return;
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if (isTaskOf)
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{
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var handler = GetType().GetMethod("PublishGenericTaskResult", BindingFlags.NonPublic | BindingFlags.Static)?.MakeGenericMethod(actualType);
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Debug.Assert(handler != null, nameof(handler) + " != null");
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context.Result.SetHandler(async (messageContext, value) => { await (Task) handler.Invoke(null, new[] {messageContext, value }); });
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}
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else
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context.Result.SetHandler((messageContext, value) => Reply(value, messageContext));
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}
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// ReSharper disable once UnusedMember.Local - used implicitly above
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private static async Task PublishGenericTaskResult<T>(IMessageContext messageContext, object value) where T : class
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{
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var message = await (Task<T>)value;
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await Reply(message, messageContext);
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}
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private static Task Reply(object message, IMessageContext messageContext)
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{
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if (message == null)
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throw new ArgumentException("Return value of a request message handler must not be null");
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var publisher = (IInternalPublisher)messageContext.DependencyResolver.Resolve<IPublisher>();
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var properties = new BasicProperties();
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// Only set the property if it's not null, otherwise a string reference exception can occur:
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// http://rabbitmq.1065348.n5.nabble.com/SocketException-when-invoking-model-BasicPublish-td36330.html
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if (messageContext.Properties.IsCorrelationIdPresent())
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properties.CorrelationId = messageContext.Properties.CorrelationId;
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if (messageContext.Properties.IsReplyToPresent())
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return publisher.PublishDirect(message, messageContext.Properties.ReplyTo, properties);
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return publisher.Publish(message, properties);
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}
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}
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}
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