SingalR for realtime entitychanges

DiunaBI.UI.Shared/Services/EntityChangeHubService.cs

@@ -0,0 +1,191 @@
+using Microsoft.AspNetCore.SignalR.Client;
+using Microsoft.Extensions.Logging;
+
+namespace DiunaBI.UI.Shared.Services;
+
+public class EntityChangeHubService : IAsyncDisposable
+{
+    private readonly string _hubUrl;
+    private readonly ILogger<EntityChangeHubService> _logger;
+    private HubConnection? _hubConnection;
+    private bool _isInitialized;
+    private readonly SemaphoreSlim _initializationLock = new SemaphoreSlim(1, 1);
+    private static int _instanceCounter = 0;
+    private readonly int _instanceId;
+
+    // Events that components can subscribe to
+    public event Action<string, string, string>? EntityChanged;
+
+    public EntityChangeHubService(
+        string apiBaseUrl,
+        IServiceProvider serviceProvider,
+        ILogger<EntityChangeHubService> logger)
+    {
+        _instanceId = Interlocked.Increment(ref _instanceCounter);
+
+        // Convert HTTP URL to SignalR hub URL
+        var baseUrl = apiBaseUrl.TrimEnd('/');
+        _hubUrl = baseUrl + "/hubs/entitychanges";
+
+        _logger = logger;
+        _logger.LogInformation("🏗️ EntityChangeHubService instance #{InstanceId} created. Hub URL: {HubUrl}", _instanceId, _hubUrl);
+        Console.WriteLine($"🏗️ EntityChangeHubService instance #{_instanceId} created. Hub URL: {_hubUrl}, _isInitialized = {_isInitialized}");
+    }
+
+    public async Task InitializeAsync()
+    {
+        _logger.LogInformation("🔍 Instance #{InstanceId} InitializeAsync called. _isInitialized = {IsInitialized}, _hubConnection null? {IsNull}", _instanceId, _isInitialized, _hubConnection == null);
+        Console.WriteLine($"🔍 Instance #{_instanceId} InitializeAsync called. _isInitialized = {_isInitialized}, _hubConnection null? {_hubConnection == null}");
+
+        if (_isInitialized)
+        {
+            _logger.LogInformation("⏭️ Instance #{InstanceId} SignalR already initialized, skipping", _instanceId);
+            Console.WriteLine($"⏭️ Instance #{_instanceId} SignalR already initialized, skipping");
+            return;
+        }
+
+        await _initializationLock.WaitAsync();
+        try
+        {
+            // Double-check after acquiring lock
+            if (_isInitialized)
+            {
+                Console.WriteLine($"⏭️ SignalR already initialized (after lock), skipping");
+                return;
+            }
+
+            _logger.LogInformation("🔌 Initializing SignalR connection to {HubUrl}", _hubUrl);
+            Console.WriteLine($"🔌 Initializing SignalR connection to {_hubUrl}");
+
+            _hubConnection = new HubConnectionBuilder()
+                .WithUrl(_hubUrl)
+                .WithAutomaticReconnect()
+                .Build();
+
+            // Subscribe to EntityChanged messages
+            _hubConnection.On<object>("EntityChanged", (data) =>
+            {
+                Console.WriteLine($"🔔 RAW SignalR message received at {DateTime.Now:HH:mm:ss.fff}");
+                Console.WriteLine($"🔔 Data type: {data?.GetType().FullName}");
+
+                try
+                {
+                    // Parse the anonymous object
+                    var json = System.Text.Json.JsonSerializer.Serialize(data);
+                    Console.WriteLine($"📨 Received SignalR message: {json}");
+
+                    // Use case-insensitive deserialization (backend sends camelCase: module, id, operation)
+                    var options = new System.Text.Json.JsonSerializerOptions
+                    {
+                        PropertyNameCaseInsensitive = true
+                    };
+                    var change = System.Text.Json.JsonSerializer.Deserialize<EntityChangeMessage>(json, options);
+
+                    if (change != null)
+                    {
+                        _logger.LogInformation("📨 Received entity change: {Module} {Id} {Operation}",
+                            change.Module, change.Id, change.Operation);
+                        Console.WriteLine($"📨 Entity change: {change.Module} {change.Id} {change.Operation}");
+
+                        // Notify all subscribers
+                        Console.WriteLine($"🔔 Invoking EntityChanged event, subscribers: {EntityChanged?.GetInvocationList().Length ?? 0}");
+                        EntityChanged?.Invoke(change.Module, change.Id, change.Operation);
+                        Console.WriteLine($"🔔 EntityChanged event invoked successfully");
+                    }
+                    else
+                    {
+                        Console.WriteLine($"⚠️ Deserialized change is null");
+                    }
+                }
+                catch (Exception ex)
+                {
+                    _logger.LogError(ex, "❌ Error processing entity change message");
+                    Console.WriteLine($"❌ Error processing message: {ex.Message}");
+                    Console.WriteLine($"❌ Stack trace: {ex.StackTrace}");
+                }
+            });
+
+            _hubConnection.Reconnecting += (error) =>
+            {
+                _logger.LogWarning("SignalR reconnecting: {Error}", error?.Message);
+                Console.WriteLine($"⚠️ SignalR reconnecting: {error?.Message}");
+                return Task.CompletedTask;
+            };
+
+            _hubConnection.Reconnected += (connectionId) =>
+            {
+                _logger.LogInformation("✅ SignalR reconnected: {ConnectionId}", connectionId);
+                Console.WriteLine($"✅ SignalR reconnected: {connectionId}");
+                return Task.CompletedTask;
+            };
+
+            _hubConnection.Closed += (error) =>
+            {
+                _logger.LogError(error, "❌ SignalR connection closed");
+                Console.WriteLine($"❌ SignalR connection closed: {error?.Message}");
+                return Task.CompletedTask;
+            };
+
+            await StartConnectionAsync();
+            _isInitialized = true;
+            _logger.LogInformation("✅ Instance #{InstanceId} _isInitialized set to true", _instanceId);
+            Console.WriteLine($"✅ Instance #{_instanceId} _isInitialized set to true");
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "❌ Instance #{InstanceId} Failed to initialize SignalR connection", _instanceId);
+            Console.WriteLine($"❌ Instance #{_instanceId} Failed to initialize SignalR: {ex.Message}");
+        }
+        finally
+        {
+            _initializationLock.Release();
+        }
+    }
+
+    private async Task StartConnectionAsync()
+    {
+        if (_hubConnection == null)
+        {
+            _logger.LogWarning("Hub connection is null, cannot start");
+            return;
+        }
+
+        try
+        {
+            Console.WriteLine($"🔌 Starting SignalR connection...");
+            await _hubConnection.StartAsync();
+            _logger.LogInformation("✅ SignalR connected successfully");
+            Console.WriteLine($"✅ SignalR connected successfully to {_hubUrl}");
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "❌ Failed to start SignalR connection");
+            Console.WriteLine($"❌ Failed to start SignalR: {ex.Message}\n{ex.StackTrace}");
+        }
+    }
+
+    public async ValueTask DisposeAsync()
+    {
+        if (_hubConnection != null)
+        {
+            try
+            {
+                await _hubConnection.StopAsync();
+                await _hubConnection.DisposeAsync();
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Error disposing SignalR connection");
+            }
+        }
+
+        _initializationLock?.Dispose();
+    }
+}
+
+public class EntityChangeMessage
+{
+    public string Module { get; set; } = string.Empty;
+    public string Id { get; set; } = string.Empty;
+    public string Operation { get; set; } = string.Empty;
+}