✨ Account service account deleted broadcast message & sphere service clean up

DysonNetwork.Develop/Program.cs

@@ -3,6 +3,7 @@ using DysonNetwork.Shared.Auth;
 using DysonNetwork.Shared.Http;
 using DysonNetwork.Shared.Registry;
 using DysonNetwork.Develop.Startup;
+using DysonNetwork.Shared.Stream;
 using Microsoft.EntityFrameworkCore;
 
 var builder = WebApplication.CreateBuilder(args);
@@ -10,6 +11,7 @@ var builder = WebApplication.CreateBuilder(args);
 builder.ConfigureAppKestrel(builder.Configuration);
 
 builder.Services.AddRegistryService(builder.Configuration);
+builder.Services.AddStreamConnection(builder.Configuration);
 builder.Services.AddAppServices(builder.Configuration);
 builder.Services.AddAppAuthentication();
 builder.Services.AddAppSwagger();

DysonNetwork.Pass/Account/AccountService.cs

@@ -1,4 +1,5 @@
 using System.Globalization;
+using System.Text.Json;
 using DysonNetwork.Pass.Auth;
 using DysonNetwork.Pass.Auth.OpenId;
 using DysonNetwork.Pass.Email;
@@ -6,9 +7,11 @@ using DysonNetwork.Pass.Localization;
 using DysonNetwork.Pass.Permission;
 using DysonNetwork.Shared.Cache;
 using DysonNetwork.Shared.Proto;
+using DysonNetwork.Shared.Stream;
 using EFCore.BulkExtensions;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Localization;
+using NATS.Client.Core;
 using NodaTime;
 using OtpNet;
 using AuthService = DysonNetwork.Pass.Auth.AuthService;
@@ -23,7 +26,8 @@ public class AccountService(
     PusherService.PusherServiceClient pusher,
     IStringLocalizer<NotificationResource> localizer,
     ICacheService cache,
-    ILogger<AccountService> logger
+    ILogger<AccountService> logger,
+    INatsConnection nats
 )
 {
     public static void SetCultureInfo(Account account)
@@ -696,5 +700,11 @@ public class AccountService(
 
         db.Accounts.Remove(account);
         await db.SaveChangesAsync();
+
+        await nats.PublishAsync(AccountDeletedEvent.Type, JsonSerializer.SerializeToUtf8Bytes(new AccountDeletedEvent
+        {
+            AccountId = account.Id,
+            DeletedAt = SystemClock.Instance.GetCurrentInstant()
+        }));
     }
 }

DysonNetwork.Shared/Stream/AccountEvent.cs

@@ -4,6 +4,8 @@ namespace DysonNetwork.Shared.Stream;
 
 public class AccountDeletedEvent
 {
+    public static string Type => "account.deleted";
+    
     public Guid AccountId { get; set; } = Guid.NewGuid();
     public Instant DeletedAt { get; set; } = SystemClock.Instance.GetCurrentInstant();
 }

DysonNetwork.Sphere/Program.cs

@@ -2,6 +2,7 @@ using DysonNetwork.Shared.Auth;
 using DysonNetwork.Shared.Http;
 using DysonNetwork.Shared.PageData;
 using DysonNetwork.Shared.Registry;
+using DysonNetwork.Shared.Stream;
 using DysonNetwork.Sphere;
 using DysonNetwork.Sphere.PageData;
 using DysonNetwork.Sphere.Startup;
@@ -18,6 +19,7 @@ builder.Services.AddAppMetrics();
 
 // Add application services
 builder.Services.AddRegistryService(builder.Configuration);
+builder.Services.AddStreamConnection(builder.Configuration);
 builder.Services.AddAppServices(builder.Configuration);
 builder.Services.AddAppRateLimiting();
 builder.Services.AddAppAuthentication();

DysonNetwork.Sphere/Startup/BroadcastEventHandler.cs

@@ -0,0 +1,51 @@
+using System.Text.Json;
+using DysonNetwork.Shared.Stream;
+using Microsoft.EntityFrameworkCore;
+using NATS.Client.Core;
+
+namespace DysonNetwork.Sphere.Startup;
+
+public class BroadcastEventHandler(
+    INatsConnection nats,
+    ILogger<BroadcastEventHandler> logger,
+    AppDatabase db
+) : BackgroundService
+{
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        await foreach (var msg in nats.SubscribeAsync<byte[]>("accounts.deleted", cancellationToken: stoppingToken))
+        {
+            try
+            {
+                var evt = JsonSerializer.Deserialize<AccountDeletedEvent>(msg.Data);
+                if (evt == null) continue;
+
+                logger.LogInformation("Account deleted: {AccountId}", evt.AccountId);
+
+                await using var transaction = await db.Database.BeginTransactionAsync(cancellationToken: stoppingToken);
+                try
+                {
+                    var publishers = await db.Publishers
+                        .Where(p => p.Members.All(m => m.AccountId == evt.AccountId))
+                        .ToListAsync(cancellationToken: stoppingToken);
+
+                    foreach (var publisher in publishers)
+                        await db.Posts
+                            .Where(p => p.PublisherId == publisher.Id)
+                            .ExecuteDeleteAsync(cancellationToken: stoppingToken);
+
+                    await transaction.CommitAsync(cancellationToken: stoppingToken);
+                }
+                catch (Exception)
+                {
+                    await transaction.RollbackAsync(cancellationToken: stoppingToken);
+                    throw;
+                }
+            }
+            catch (Exception ex)
+            {
+                logger.LogError(ex, "Error processing AccountDeleted");
+            }
+        }
+    }
+}

DysonNetwork.Sphere/Startup/ServiceCollectionExtensions.cs

@@ -73,6 +73,8 @@ public static class ServiceCollectionExtensions
             options.SupportedUICultures = supportedCultures;
         });
 
+        services.AddHostedService<BroadcastEventHandler>();
+
         return services;
     }
 

DysonNetwork.sln.DotSettings.user

@@ -71,6 +71,7 @@
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