Only validate messages that have IValidatable marker

Author: ejsmith

samples/ModularMonolithSample/src/Common.Module/Middleware/ValidationMiddleware.cs

@@ -6,7 +6,7 @@ namespace Common.Module.Middleware;
 [Middleware(5)]
 public static class ValidationMiddleware
 {
-    public static HandlerResult Before(object message)
+    public static HandlerResult Before(IValidatable message)
     {
         if (MiniValidator.TryValidate(message, out var errors))
             return HandlerResult.Continue();
@@ -16,3 +16,5 @@ public static HandlerResult Before(object message)
         return Result.Invalid(validationErrors);
     }
 }
+
+public interface IValidatable { }

samples/ModularMonolithSample/src/Orders.Module/Messages/OrderMessages.cs

@@ -1,4 +1,5 @@
 using System.ComponentModel.DataAnnotations;
+using Common.Module.Middleware;
 
 namespace Orders.Module.Messages;
 
@@ -14,17 +15,17 @@ public record CreateOrder(
 
     [Required(ErrorMessage = "Description is required")]
     [StringLength(200, MinimumLength = 5, ErrorMessage = "Description must be between 5 and 200 characters")]
-    string Description);
+    string Description) : IValidatable;
 
 public record UpdateOrder(
     [Required] string OrderId,
     decimal? Amount,
-    string? Description);
+    string? Description) : IValidatable;
 
-public record DeleteOrder([Required] string OrderId);
+public record DeleteOrder([Required] string OrderId) : IValidatable;
 
 // Queries
-public record GetOrder([Required] string OrderId);
+public record GetOrder([Required] string OrderId) : IValidatable;
 public record GetOrders();
 
 // Events

samples/ModularMonolithSample/src/Products.Module/Messages/ProductMessages.cs

@@ -1,4 +1,5 @@
 using System.ComponentModel.DataAnnotations;
+using Common.Module.Middleware;
 
 namespace Products.Module.Messages;
 
@@ -14,18 +15,18 @@ public record CreateProduct(
 
     [Required(ErrorMessage = "Price is required")]
     [Range(0.01, 1000000, ErrorMessage = "Price must be between $0.01 and $1,000,000")]
-    decimal Price);
+    decimal Price) : IValidatable;
 
 public record UpdateProduct(
     [Required] string ProductId,
     string? Name,
     string? Description,
-    decimal? Price);
+    decimal? Price) : IValidatable;
 
-public record DeleteProduct([Required] string ProductId);
+public record DeleteProduct([Required] string ProductId) : IValidatable;
 
 // Queries
-public record GetProduct([Required] string ProductId);
+public record GetProduct([Required] string ProductId) : IValidatable;
 public record GetProducts();
 
 // Events