Merge pull request #19 from meysamhadeli/develop

add inbox pattern

src/BuildingBlocks/MassTransit/ConsumeFilter.cs

@@ -0,0 +1,38 @@
+using BuildingBlocks.Core.Event;
+using BuildingBlocks.MessageProcessor;
+using MassTransit;
+
+namespace BuildingBlocks.MassTransit;
+
+// Handle inbox messages with masstransit pipeline
+public class ConsumeFilter<T> : IFilter<ConsumeContext<T>>
+    where T : class
+{
+    private readonly IPersistMessageProcessor _persistMessageProcessor;
+
+    public ConsumeFilter(IPersistMessageProcessor persistMessageProcessor)
+    {
+        _persistMessageProcessor = persistMessageProcessor;
+    }
+
+    public async Task Send(ConsumeContext<T> context, IPipe<ConsumeContext<T>> next)
+    {
+        var id = await _persistMessageProcessor.AddReceivedMessageAsync(
+            new MessageEnvelope(
+                context.Message,
+                context.Headers.ToDictionary(x => x.Key, x => x.Value))
+        );
+
+        var message = await _persistMessageProcessor.ExistMessageAsync(id);
+
+        if (message is null)
+        {
+            await next.Send(context);
+            await _persistMessageProcessor.ProcessInboxAsync(id);
+        }
+    }
+
+    public void Probe(ProbeContext context)
+    {
+    }
+}

src/BuildingBlocks/MassTransit/Extensions.cs

@@ -54,6 +54,8 @@ public static class Extensions
                                     ? type.Name.Underscore()
                                     : $"{rabbitMqOptions.ExchangeName}_{type.Name.Underscore()}", e =>
                                 {
+                                    e.UseConsumeFilter(typeof(ConsumeFilter<>), context); //generic filter
+
                                     foreach (var consumer in consumers)
                                     {
                                         configurator.ConfigureEndpoints(context, x => x.Exclude(consumer));

src/BuildingBlocks/MessageProcessor/IPersistMessageProcessor.cs

@@ -14,7 +14,7 @@ public interface IPersistMessageProcessor
         CancellationToken cancellationToken = default)
         where TMessageEnvelope : MessageEnvelope;
 
-    Task AddReceivedMessageAsync<TMessageEnvelope>(
+    Task<Guid> AddReceivedMessageAsync<TMessageEnvelope>(
         TMessageEnvelope messageEnvelope,
         CancellationToken cancellationToken = default)
         where TMessageEnvelope : MessageEnvelope;
@@ -24,6 +24,13 @@ public interface IPersistMessageProcessor
         CancellationToken cancellationToken = default)
         where TCommand : class, IInternalCommand;
 
+    Task<PersistMessage> ExistMessageAsync(
+        Guid messageId,
+        CancellationToken cancellationToken = default);
+
+    Task ProcessInboxAsync(
+        Guid messageId,
+        CancellationToken cancellationToken = default);
 
     Task ProcessAsync(Guid messageId, MessageDeliveryType deliveryType, CancellationToken cancellationToken = default);
 

src/BuildingBlocks/MessageProcessor/PersistMessageProcessor.cs

@@ -37,10 +37,10 @@ public class PersistMessageProcessor : IPersistMessageProcessor
         await SavePersistMessageAsync(messageEnvelope, MessageDeliveryType.Outbox, cancellationToken);
     }
 
-    public async Task AddReceivedMessageAsync<TMessageEnvelope>(TMessageEnvelope messageEnvelope,
+    public Task<Guid> AddReceivedMessageAsync<TMessageEnvelope>(TMessageEnvelope messageEnvelope,
         CancellationToken cancellationToken = default) where TMessageEnvelope : MessageEnvelope
     {
-        await SavePersistMessageAsync(messageEnvelope, MessageDeliveryType.Inbox, cancellationToken);
+        return SavePersistMessageAsync(messageEnvelope, MessageDeliveryType.Inbox, cancellationToken);
     }
 
     public async Task AddInternalMessageAsync<TCommand>(TCommand internalCommand,
@@ -50,6 +50,15 @@ public class PersistMessageProcessor : IPersistMessageProcessor
             cancellationToken);
     }
 
+    public Task<PersistMessage> ExistMessageAsync(Guid messageId, CancellationToken cancellationToken = default)
+    {
+        return _dbContext.PersistMessages.FirstOrDefaultAsync(x =>
+                x.Id == messageId &&
+                x.DeliveryType == MessageDeliveryType.Inbox &&
+                x.MessageStatus == MessageStatus.Processed,
+            cancellationToken);
+    }
+
     public async Task ProcessAsync(
         Guid messageId,
         MessageDeliveryType deliveryType,
@@ -64,24 +73,18 @@ public class PersistMessageProcessor : IPersistMessageProcessor
 
         switch (deliveryType)
         {
-            case MessageDeliveryType.Inbox:
-                await ProcessInbox(message, cancellationToken);
-                break;
             case MessageDeliveryType.Internal:
-                await ProcessInternal(message, cancellationToken);
+                await ProcessInternalAsync(message, cancellationToken);
                 break;
             case MessageDeliveryType.Outbox:
-                await ProcessOutbox(message, cancellationToken);
+                await ProcessOutboxAsync(message, cancellationToken);
                 break;
         }
 
-        message.ChangeState(MessageStatus.Processed);
-
-        _dbContext.PersistMessages.Update(message);
-
-        await _dbContext.SaveChangesAsync(cancellationToken);
+        await ChangeMessageStatusAsync(message, cancellationToken);
     }
 
+
     public async Task ProcessAllAsync(CancellationToken cancellationToken = default)
     {
         var messages = await _dbContext.PersistMessages.Where(x => x.MessageStatus != MessageStatus.Processed)
@@ -93,7 +96,18 @@ public class PersistMessageProcessor : IPersistMessageProcessor
         }
     }
 
-    private async Task SavePersistMessageAsync(
+    public async Task ProcessInboxAsync(Guid messageId, CancellationToken cancellationToken = default)
+    {
+        var message = await _dbContext.PersistMessages.FirstOrDefaultAsync(
+                x => x.Id == messageId &&
+                     x.DeliveryType == MessageDeliveryType.Inbox &&
+                     x.MessageStatus == MessageStatus.InProgress,
+                cancellationToken);
+
+        await ChangeMessageStatusAsync(message, cancellationToken);
+    }
+
+    private async Task<Guid> SavePersistMessageAsync(
         MessageEnvelope messageEnvelope,
         MessageDeliveryType deliveryType,
         CancellationToken cancellationToken = default)
@@ -124,9 +138,11 @@ public class PersistMessageProcessor : IPersistMessageProcessor
             "Message with id: {MessageID} and delivery type: {DeliveryType} saved in persistence message store.",
             id,
             deliveryType.ToString());
+
+        return id;
     }
 
-    private async Task ProcessOutbox(PersistMessage message, CancellationToken cancellationToken)
+    private async Task ProcessOutboxAsync(PersistMessage message, CancellationToken cancellationToken)
     {
         MessageEnvelope? messageEnvelope = JsonSerializer.Deserialize<MessageEnvelope>(message.Data);
 
@@ -153,7 +169,7 @@ public class PersistMessageProcessor : IPersistMessageProcessor
         }
     }
 
-    private async Task ProcessInternal(PersistMessage message, CancellationToken cancellationToken)
+    private async Task ProcessInternalAsync(PersistMessage message, CancellationToken cancellationToken)
     {
         MessageEnvelope? messageEnvelope = JsonSerializer.Deserialize<MessageEnvelope>(message.Data);
 
@@ -174,8 +190,12 @@ public class PersistMessageProcessor : IPersistMessageProcessor
         }
     }
 
-    private Task ProcessInbox(PersistMessage message, CancellationToken cancellationToken)
+    private async Task ChangeMessageStatusAsync(PersistMessage message, CancellationToken cancellationToken)
     {
-        return Task.CompletedTask;
+        message.ChangeState(MessageStatus.Processed);
+
+        _dbContext.PersistMessages.Update(message);
+
+        await _dbContext.SaveChangesAsync(cancellationToken);
     }
 }