init

Femto.Modules.Blog/Infrastructure/Integration/Outbox/Outbox.cs

@@ -0,0 +1,40 @@
+using System.Reflection;
+using System.Text.Json;
+using Femto.Common.Attributes;
+using Femto.Common.Integration;
+using Femto.Modules.Blog.Data;
+using Microsoft.EntityFrameworkCore;
+
+namespace Femto.Modules.Blog.Infrastructure.Integration;
+
+internal class Outbox(BlogContext context)
+{
+    public async Task AddMessage<TMessage>(Guid aggregateId, TMessage message, CancellationToken cancellationToken)
+        where TMessage : IIntegrationEvent
+    {
+        var eventType = typeof(TMessage).GetCustomAttribute<EventTypeAttribute>();
+        if (eventType is null)
+            throw new InvalidOperationException($"{typeof(TMessage).Name} does not have EventType attribute");
+        
+        await context.Outbox.AddAsync(
+            new(
+                message.EventId,
+                aggregateId,
+                eventType.Name,
+                JsonSerializer.Serialize(message)
+            ),
+            cancellationToken
+        );
+    }
+
+    public async Task<IList<OutboxEntry>> GetPendingMessages(CancellationToken cancellationToken)
+    {
+        var now = DateTime.UtcNow;
+
+        return await context
+            .Outbox.Where(message => message.Status == OutboxEntryStatus.Pending)
+            .Where(message => message.NextRetryAt == null || message.NextRetryAt <= now)
+            .OrderBy(message => message.CreatedAt)
+            .ToListAsync(cancellationToken);
+    }
+}