Replace shared email commands with MediatR notifications (#280)

web/backend/Features/Features.Emails/Commands/SendRegistrationEmail/SendRegistrationEmailHandler.cs

@@ -1,22 +0,0 @@
-using Features.Emails.Services;
-using MediatR;
-using Shared.Application.Emails;
-
-namespace Features.Emails.Commands.SendRegistrationEmail;
-
-/// <summary>
-///     Handles <see cref="SendRegistrationEmailCommand" />, the cross-slice command sent by Features.Users
-///     after a new user registers.
-/// </summary>
-public class SendRegistrationEmailHandler(IEmailDispatcher emailDispatcher)
-    : IRequestHandler<SendRegistrationEmailCommand>
-{
-    public Task Handle(SendRegistrationEmailCommand request, CancellationToken cancellationToken)
-    {
-        return emailDispatcher.SendRegistrationEmailAsync(
-            request.FirstName,
-            request.Email,
-            request.ConfirmationToken
-        );
-    }
-}

web/backend/Features/Features.Emails/Commands/SendResendConfirmationEmail/SendResendConfirmationEmailHandler.cs

@@ -1,25 +0,0 @@
-using Features.Emails.Services;
-using MediatR;
-using Shared.Application.Emails;
-
-namespace Features.Emails.Commands.SendResendConfirmationEmail;
-
-/// <summary>
-///     Handles <see cref="SendResendConfirmationEmailCommand" />, the cross-slice command sent by Features.Users
-///     when a user requests a fresh confirmation link.
-/// </summary>
-public class SendResendConfirmationEmailHandler(IEmailDispatcher emailDispatcher)
-    : IRequestHandler<SendResendConfirmationEmailCommand>
-{
-    public Task Handle(
-        SendResendConfirmationEmailCommand request,
-        CancellationToken cancellationToken
-    )
-    {
-        return emailDispatcher.SendResendConfirmationEmailAsync(
-            request.FirstName,
-            request.Email,
-            request.ConfirmationToken
-        );
-    }
-}

web/backend/Features/Features.Emails/Features.Emails.csproj

@@ -18,5 +18,6 @@
         <ProjectReference Include="..\..\Infrastructure\Infrastructure.Email\Infrastructure.Email.csproj" />
         <ProjectReference Include="..\..\Infrastructure\Infrastructure.Email.Templates\Infrastructure.Email.Templates.csproj" />
         <ProjectReference Include="..\..\Shared\Shared.Application\Shared.Application.csproj" />
+        <ProjectReference Include="..\Features.Users\Features.Users.csproj" />
     </ItemGroup>
 </Project>

web/backend/Features/Features.Emails/Notifications/ConfirmationEmailResendRequestedNotificationHandler.cs

@@ -0,0 +1,44 @@
+using Features.Auth.Notifications;
+using Features.Emails.Services;
+using MediatR;
+using Microsoft.Extensions.Logging;
+
+namespace Features.Emails.Notifications;
+
+/// <summary>
+///     Handles <see cref="ConfirmationEmailResendRequestedNotification" />, the cross-slice notification
+///     published by Features.Users when a user requests a fresh confirmation link, by sending the resend
+///     confirmation email.
+/// </summary>
+public class ConfirmationEmailResendRequestedNotificationHandler(
+    IEmailDispatcher emailDispatcher,
+    ILogger<ConfirmationEmailResendRequestedNotificationHandler> logger
+) : INotificationHandler<ConfirmationEmailResendRequestedNotification>
+{
+    /// <remarks>
+    ///     Delivery failures are logged and swallowed rather than rethrown, so that a broken mail server
+    ///     never fails the resend request that already succeeded.
+    /// </remarks>
+    public async Task Handle(
+        ConfirmationEmailResendRequestedNotification notification,
+        CancellationToken cancellationToken
+    )
+    {
+        try
+        {
+            await emailDispatcher.SendResendConfirmationEmailAsync(
+                notification.FirstName,
+                notification.Email,
+                notification.ConfirmationToken
+            );
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(
+                ex,
+                "Failed to send resend confirmation email to user {UserId}",
+                notification.UserId
+            );
+        }
+    }
+}

web/backend/Features/Features.Emails/Notifications/UserRegisteredNotificationHandler.cs

@@ -0,0 +1,40 @@
+using Features.Auth.Notifications;
+using Features.Emails.Services;
+using MediatR;
+using Microsoft.Extensions.Logging;
+
+namespace Features.Emails.Notifications;
+
+/// <summary>
+///     Handles <see cref="UserRegisteredNotification" />, the cross-slice notification published by
+///     Features.Users after a new user registers, by sending the registration confirmation email.
+/// </summary>
+public class UserRegisteredNotificationHandler(
+    IEmailDispatcher emailDispatcher,
+    ILogger<UserRegisteredNotificationHandler> logger
+) : INotificationHandler<UserRegisteredNotification>
+{
+    /// <remarks>
+    ///     Delivery failures are logged and swallowed rather than rethrown, so that a broken mail server
+    ///     never fails the registration that already succeeded.
+    /// </remarks>
+    public async Task Handle(UserRegisteredNotification notification, CancellationToken cancellationToken)
+    {
+        try
+        {
+            await emailDispatcher.SendRegistrationEmailAsync(
+                notification.FirstName,
+                notification.Email,
+                notification.ConfirmationToken
+            );
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(
+                ex,
+                "Failed to send registration confirmation email to user {UserId}",
+                notification.UserId
+            );
+        }
+    }
+}