WIP

PlanTempus.Core/Outbox/IOutboxService.cs

@@ -0,0 +1,13 @@
+#nullable enable
+
+using System.Data;
+
+namespace PlanTempus.Core.Outbox;
+
+public interface IOutboxService
+{
+	Task EnqueueAsync(string type, object payload, IDbConnection? connection = null, IDbTransaction? transaction = null);
+	Task<List<OutboxMessage>> GetPendingAsync(int batchSize = 10);
+	Task MarkAsSentAsync(Guid id);
+	Task MarkAsFailedAsync(Guid id, string errorMessage);
+}

PlanTempus.Core/Outbox/OutboxMessage.cs

@@ -0,0 +1,27 @@
+#nullable enable
+
+namespace PlanTempus.Core.Outbox;
+
+public class OutboxMessage
+{
+	public Guid Id { get; set; }
+	public required string Type { get; set; }
+	public required object Payload { get; set; }
+	public string Status { get; set; } = "pending";
+	public DateTime CreatedAt { get; set; }
+	public DateTime? ProcessedAt { get; set; }
+	public int RetryCount { get; set; }
+	public string? ErrorMessage { get; set; }
+}
+
+public static class OutboxMessageTypes
+{
+	public const string VerificationEmail = "verification_email";
+}
+
+public class VerificationEmailPayload
+{
+	public required string Email { get; set; }
+	public required string UserName { get; set; }
+	public required string Token { get; set; }
+}

PlanTempus.Core/Outbox/OutboxModule.cs

@@ -0,0 +1,11 @@
+using Autofac;
+
+namespace PlanTempus.Core.Outbox;
+
+public class OutboxModule : Module
+{
+	protected override void Load(ContainerBuilder builder)
+	{
+		builder.RegisterType<OutboxService>().As<IOutboxService>().InstancePerLifetimeScope();
+	}
+}

PlanTempus.Core/Outbox/OutboxService.cs

@@ -0,0 +1,104 @@
+#nullable enable
+
+using System.Data;
+using System.Text.Json;
+using Insight.Database;
+using PlanTempus.Core.Database;
+
+namespace PlanTempus.Core.Outbox;
+
+public class OutboxService(IDatabaseOperations databaseOperations) : IOutboxService
+{
+	public async Task EnqueueAsync(string type, object payload, IDbConnection? connection = null, IDbTransaction? transaction = null)
+	{
+		var sql = @"
+			INSERT INTO system.outbox (type, payload)
+			VALUES (@Type, @Payload::jsonb)";
+
+		var parameters = new
+		{
+			Type = type,
+			Payload = JsonSerializer.Serialize(payload)
+		};
+
+		if (connection != null)
+		{
+			await connection.ExecuteSqlAsync(sql, parameters);
+		}
+		else
+		{
+			using var db = databaseOperations.CreateScope(nameof(OutboxService));
+			await db.Connection.ExecuteSqlAsync(sql, parameters);
+		}
+	}
+
+	public async Task<List<OutboxMessage>> GetPendingAsync(int batchSize = 10)
+	{
+		using var db = databaseOperations.CreateScope(nameof(OutboxService));
+
+		var sql = @"
+			UPDATE system.outbox
+			SET status = 'processing'
+			WHERE id IN (
+				SELECT id FROM system.outbox
+				WHERE status = 'pending'
+				ORDER BY created_at
+				LIMIT @BatchSize
+				FOR UPDATE SKIP LOCKED
+			)
+			RETURNING id, type, payload, status, created_at, processed_at, retry_count, error_message";
+
+		var results = await db.Connection.QuerySqlAsync<OutboxMessageDto>(sql, new { BatchSize = batchSize });
+
+		return results.Select(r => new OutboxMessage
+		{
+			Id = r.Id,
+			Type = r.Type,
+			Payload = JsonSerializer.Deserialize<JsonElement>(r.Payload),
+			Status = r.Status,
+			CreatedAt = r.CreatedAt,
+			ProcessedAt = r.ProcessedAt,
+			RetryCount = r.RetryCount,
+			ErrorMessage = r.ErrorMessage
+		}).ToList();
+	}
+
+	public async Task MarkAsSentAsync(Guid id)
+	{
+		using var db = databaseOperations.CreateScope(nameof(OutboxService));
+
+		var sql = @"
+			UPDATE system.outbox
+			SET status = 'sent', processed_at = NOW()
+			WHERE id = @Id";
+
+		await db.Connection.ExecuteSqlAsync(sql, new { Id = id });
+	}
+
+	public async Task MarkAsFailedAsync(Guid id, string errorMessage)
+	{
+		using var db = databaseOperations.CreateScope(nameof(OutboxService));
+
+		var sql = @"
+			UPDATE system.outbox
+			SET status = 'failed',
+				processed_at = NOW(),
+				retry_count = retry_count + 1,
+				error_message = @ErrorMessage
+			WHERE id = @Id";
+
+		await db.Connection.ExecuteSqlAsync(sql, new { Id = id, ErrorMessage = errorMessage });
+	}
+
+	private class OutboxMessageDto
+	{
+		public Guid Id { get; set; }
+		public string Type { get; set; } = "";
+		public string Payload { get; set; } = "";
+		public string Status { get; set; } = "";
+		public DateTime CreatedAt { get; set; }
+		public DateTime? ProcessedAt { get; set; }
+		public int RetryCount { get; set; }
+		public string? ErrorMessage { get; set; }
+	}
+}