🎉 Initial commit for the Zone project

DysonNetwork.Zone/Startup/BroadcastEventHandler.cs

@@ -0,0 +1,61 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+using DysonNetwork.Shared.Proto;
+using DysonNetwork.Shared.Stream;
+using NATS.Client.Core;
+using NATS.Client.JetStream.Models;
+using NATS.Net;
+
+namespace DysonNetwork.Zone.Startup;
+
+public class BroadcastEventHandler(
+    IServiceProvider serviceProvider,
+    ILogger<BroadcastEventHandler> logger,
+    INatsConnection nats,
+    RingService.RingServiceClient pusher
+) : BackgroundService
+{
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        var accountTask = HandleAccountDeletions(stoppingToken);
+
+        await Task.WhenAll(accountTask);
+    }
+
+    private async Task HandleAccountDeletions(CancellationToken stoppingToken)
+    {
+        var js = nats.CreateJetStreamContext();
+
+        await js.EnsureStreamCreated("account_events", [AccountDeletedEvent.Type]);
+
+        var consumer = await js.CreateOrUpdateConsumerAsync("account_events",
+            new ConsumerConfig("sphere_account_deleted_handler"), cancellationToken: stoppingToken);
+
+        await foreach (var msg in consumer.ConsumeAsync<byte[]>(cancellationToken: stoppingToken))
+        {
+            try
+            {
+                var evt = JsonSerializer.Deserialize<AccountDeletedEvent>(msg.Data, GrpcTypeHelper.SerializerOptions);
+                if (evt == null)
+                {
+                    await msg.AckAsync(cancellationToken: stoppingToken);
+                    continue;
+                }
+
+                logger.LogInformation("Account deleted: {AccountId}", evt.AccountId);
+
+                using var scope = serviceProvider.CreateScope();
+                var db = scope.ServiceProvider.GetRequiredService<AppDatabase>();
+
+                // TODO clean up data
+
+                await msg.AckAsync(cancellationToken: stoppingToken);
+            }
+            catch (Exception ex)
+            {
+                logger.LogError(ex, "Error processing AccountDeleted");
+                await msg.NakAsync(cancellationToken: stoppingToken);
+            }
+        }
+    }
+}