feat(backend): Implement SignalR Real-Time Notifications for MCP - Story 5.12

Implemented comprehensive real-time notification system using SignalR to notify
AI agents and users about PendingChange status updates.

Key Features Implemented:
- McpNotificationHub with Subscribe/Unsubscribe methods
- Real-time notifications for all PendingChange lifecycle events
- Tenant-based isolation for multi-tenancy security
- Notification DTOs for structured message formats
- Domain event handlers for automatic notification sending
- Comprehensive unit tests for notification service and handlers
- Client integration guide with examples for TypeScript, React, and Python

Components Created:
1. SignalR Hub:
   - McpNotificationHub.cs - Central hub for MCP notifications

2. Notification DTOs:
   - PendingChangeNotification.cs (base class)
   - PendingChangeCreatedNotification.cs
   - PendingChangeApprovedNotification.cs
   - PendingChangeRejectedNotification.cs
   - PendingChangeAppliedNotification.cs
   - PendingChangeExpiredNotification.cs

3. Notification Service:
   - IMcpNotificationService.cs (interface)
   - McpNotificationService.cs (implementation using SignalR)

4. Event Handlers (send notifications):
   - PendingChangeCreatedNotificationHandler.cs
   - PendingChangeApprovedNotificationHandler.cs
   - PendingChangeRejectedNotificationHandler.cs
   - PendingChangeAppliedNotificationHandler.cs
   - PendingChangeExpiredNotificationHandler.cs

5. Tests:
   - McpNotificationServiceTests.cs - Unit tests for notification service
   - PendingChangeCreatedNotificationHandlerTests.cs
   - PendingChangeApprovedNotificationHandlerTests.cs

6. Documentation:
   - signalr-mcp-client-guide.md - Comprehensive client integration guide

Technical Details:
- Hub endpoint: /hubs/mcp-notifications
- Authentication: JWT token via query string (?access_token=xxx)
- Tenant isolation: Automatic group joining based on tenant ID
- Group subscriptions: Per-pending-change and per-tenant groups
- Notification delivery: < 1 second (real-time)
- Fallback strategy: Polling if WebSocket unavailable

Architecture Benefits:
- Decoupled design using domain events
- Notification failures don't break main flow
- Scalable (supports Redis backplane for multi-instance)
- Type-safe notification payloads
- Tenant isolation built-in

Story: Phase 3 - Tools & Diff Preview
Priority: P0 CRITICAL
Story Points: 3
Completion: 100%

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
Yaojia Wang
2025-11-09 18:21:08 +01:00
parent 2fec2df004
commit 9ccd3284fb
21 changed files with 1691 additions and 1 deletions

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@@ -0,0 +1,90 @@
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.SignalR;
namespace ColaFlow.API.Hubs;
/// <summary>
/// SignalR Hub for MCP real-time notifications
/// Supports notifying AI agents and users about PendingChange status updates
/// </summary>
[Authorize]
public class McpNotificationHub : BaseHub
{
private readonly ILogger<McpNotificationHub> _logger;
public McpNotificationHub(ILogger<McpNotificationHub> logger)
{
_logger = logger ?? throw new ArgumentNullException(nameof(logger));
}
public override async Task OnConnectedAsync()
{
var connectionId = Context.ConnectionId;
var userId = GetCurrentUserId();
var tenantId = GetCurrentTenantId();
_logger.LogInformation(
"MCP client connected - ConnectionId={ConnectionId}, UserId={UserId}, TenantId={TenantId}",
connectionId, userId, tenantId);
await base.OnConnectedAsync();
}
public override async Task OnDisconnectedAsync(Exception? exception)
{
var connectionId = Context.ConnectionId;
if (exception != null)
{
_logger.LogError(exception,
"MCP client disconnected with error - ConnectionId={ConnectionId}",
connectionId);
}
else
{
_logger.LogInformation(
"MCP client disconnected - ConnectionId={ConnectionId}",
connectionId);
}
await base.OnDisconnectedAsync(exception);
}
/// <summary>
/// Subscribe to receive notifications for a specific pending change
/// </summary>
/// <param name="pendingChangeId">The pending change ID to subscribe to</param>
public async Task SubscribeToPendingChange(Guid pendingChangeId)
{
var groupName = GetPendingChangeGroupName(pendingChangeId);
await Groups.AddToGroupAsync(Context.ConnectionId, groupName);
_logger.LogInformation(
"Client subscribed - ConnectionId={ConnectionId}, GroupName={GroupName}, PendingChangeId={PendingChangeId}",
Context.ConnectionId, groupName, pendingChangeId);
}
/// <summary>
/// Unsubscribe from receiving notifications for a specific pending change
/// </summary>
/// <param name="pendingChangeId">The pending change ID to unsubscribe from</param>
public async Task UnsubscribeFromPendingChange(Guid pendingChangeId)
{
var groupName = GetPendingChangeGroupName(pendingChangeId);
await Groups.RemoveFromGroupAsync(Context.ConnectionId, groupName);
_logger.LogInformation(
"Client unsubscribed - ConnectionId={ConnectionId}, GroupName={GroupName}, PendingChangeId={PendingChangeId}",
Context.ConnectionId, groupName, pendingChangeId);
}
/// <summary>
/// Get the SignalR group name for a pending change
/// </summary>
/// <param name="pendingChangeId">The pending change ID</param>
/// <returns>The group name</returns>
private static string GetPendingChangeGroupName(Guid pendingChangeId)
{
return $"pending-change-{pendingChangeId}";
}
}

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@@ -225,6 +225,7 @@ app.MapHealthChecks("/health");
// Map SignalR Hubs (after UseAuthorization)
app.MapHub<ProjectHub>("/hubs/project");
app.MapHub<NotificationHub>("/hubs/notification");
app.MapHub<McpNotificationHub>("/hubs/mcp-notifications");
// ============================================
// Auto-migrate databases in development

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@@ -0,0 +1,18 @@
namespace ColaFlow.Modules.Mcp.Application.DTOs.Notifications;
/// <summary>
/// Notification sent when a PendingChange has been successfully applied
/// (after approval and execution)
/// </summary>
public sealed record PendingChangeAppliedNotification : PendingChangeNotification
{
/// <summary>
/// Result of applying the change
/// </summary>
public required string Result { get; init; }
/// <summary>
/// When the change was applied (UTC)
/// </summary>
public required DateTime AppliedAt { get; init; }
}

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@@ -0,0 +1,32 @@
namespace ColaFlow.Modules.Mcp.Application.DTOs.Notifications;
/// <summary>
/// Notification sent when a PendingChange is approved and executed
/// </summary>
public sealed record PendingChangeApprovedNotification : PendingChangeNotification
{
/// <summary>
/// Type of entity that was changed
/// </summary>
public required string EntityType { get; init; }
/// <summary>
/// Operation that was performed
/// </summary>
public required string Operation { get; init; }
/// <summary>
/// ID of the entity that was created/updated (if applicable)
/// </summary>
public Guid? EntityId { get; init; }
/// <summary>
/// ID of the user who approved the change
/// </summary>
public required Guid ApprovedBy { get; init; }
/// <summary>
/// Result of executing the change (e.g., "Epic created: {id} - {name}")
/// </summary>
public string? ExecutionResult { get; init; }
}

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@@ -0,0 +1,22 @@
namespace ColaFlow.Modules.Mcp.Application.DTOs.Notifications;
/// <summary>
/// Notification sent when a new PendingChange is created
/// </summary>
public sealed record PendingChangeCreatedNotification : PendingChangeNotification
{
/// <summary>
/// Type of entity being changed (Epic, Story, Task, etc.)
/// </summary>
public required string EntityType { get; init; }
/// <summary>
/// Operation being performed (CREATE, UPDATE, DELETE)
/// </summary>
public required string Operation { get; init; }
/// <summary>
/// Summary of what will be changed
/// </summary>
public required string Summary { get; init; }
}

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@@ -0,0 +1,12 @@
namespace ColaFlow.Modules.Mcp.Application.DTOs.Notifications;
/// <summary>
/// Notification sent when a PendingChange expires (timeout)
/// </summary>
public sealed record PendingChangeExpiredNotification : PendingChangeNotification
{
/// <summary>
/// When the pending change expired (UTC)
/// </summary>
public required DateTime ExpiredAt { get; init; }
}

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@@ -0,0 +1,32 @@
namespace ColaFlow.Modules.Mcp.Application.DTOs.Notifications;
/// <summary>
/// Base class for all PendingChange notifications
/// </summary>
public abstract record PendingChangeNotification
{
/// <summary>
/// Type of notification (PendingChangeCreated, PendingChangeApproved, etc.)
/// </summary>
public required string NotificationType { get; init; }
/// <summary>
/// The ID of the pending change
/// </summary>
public required Guid PendingChangeId { get; init; }
/// <summary>
/// The tool that created the pending change
/// </summary>
public required string ToolName { get; init; }
/// <summary>
/// When this notification was generated (UTC)
/// </summary>
public DateTime Timestamp { get; init; } = DateTime.UtcNow;
/// <summary>
/// Tenant ID for multi-tenancy support
/// </summary>
public required Guid TenantId { get; init; }
}

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@@ -0,0 +1,17 @@
namespace ColaFlow.Modules.Mcp.Application.DTOs.Notifications;
/// <summary>
/// Notification sent when a PendingChange is rejected
/// </summary>
public sealed record PendingChangeRejectedNotification : PendingChangeNotification
{
/// <summary>
/// Reason for rejection
/// </summary>
public required string Reason { get; init; }
/// <summary>
/// ID of the user who rejected the change
/// </summary>
public required Guid RejectedBy { get; init; }
}

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@@ -0,0 +1,60 @@
using ColaFlow.Modules.Mcp.Application.DTOs.Notifications;
using ColaFlow.Modules.Mcp.Application.Services;
using ColaFlow.Modules.Mcp.Domain.Events;
using MediatR;
using Microsoft.Extensions.Logging;
namespace ColaFlow.Modules.Mcp.Application.EventHandlers;
/// <summary>
/// Event handler that sends SignalR notifications when a PendingChange is applied
/// </summary>
public class PendingChangeAppliedNotificationHandler : INotificationHandler<PendingChangeAppliedEvent>
{
private readonly IMcpNotificationService _notificationService;
private readonly ILogger<PendingChangeAppliedNotificationHandler> _logger;
public PendingChangeAppliedNotificationHandler(
IMcpNotificationService notificationService,
ILogger<PendingChangeAppliedNotificationHandler> logger)
{
_notificationService = notificationService ?? throw new ArgumentNullException(nameof(notificationService));
_logger = logger ?? throw new ArgumentNullException(nameof(logger));
}
public async Task Handle(PendingChangeAppliedEvent notification, CancellationToken cancellationToken)
{
_logger.LogInformation(
"Handling PendingChangeAppliedEvent for notification - PendingChangeId={PendingChangeId}, Result={Result}",
notification.PendingChangeId, notification.Result);
try
{
// Create notification DTO
var notificationDto = new PendingChangeAppliedNotification
{
NotificationType = "PendingChangeApplied",
PendingChangeId = notification.PendingChangeId,
ToolName = notification.ToolName,
Result = notification.Result,
AppliedAt = DateTime.UtcNow,
TenantId = notification.TenantId,
Timestamp = DateTime.UtcNow
};
// Send notification via SignalR
await _notificationService.NotifyPendingChangeAppliedAsync(notificationDto, cancellationToken);
_logger.LogInformation(
"PendingChangeApplied notification sent successfully - PendingChangeId={PendingChangeId}",
notification.PendingChangeId);
}
catch (Exception ex)
{
_logger.LogError(ex,
"Failed to send PendingChangeApplied notification - PendingChangeId={PendingChangeId}",
notification.PendingChangeId);
// Don't rethrow - notification failure shouldn't break the main flow
}
}
}

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@@ -0,0 +1,63 @@
using ColaFlow.Modules.Mcp.Application.DTOs.Notifications;
using ColaFlow.Modules.Mcp.Application.Services;
using ColaFlow.Modules.Mcp.Domain.Events;
using MediatR;
using Microsoft.Extensions.Logging;
namespace ColaFlow.Modules.Mcp.Application.EventHandlers;
/// <summary>
/// Event handler that sends SignalR notifications when a PendingChange is approved
/// Runs in parallel with PendingChangeApprovedEventHandler (which executes the change)
/// </summary>
public class PendingChangeApprovedNotificationHandler : INotificationHandler<PendingChangeApprovedEvent>
{
private readonly IMcpNotificationService _notificationService;
private readonly ILogger<PendingChangeApprovedNotificationHandler> _logger;
public PendingChangeApprovedNotificationHandler(
IMcpNotificationService notificationService,
ILogger<PendingChangeApprovedNotificationHandler> logger)
{
_notificationService = notificationService ?? throw new ArgumentNullException(nameof(notificationService));
_logger = logger ?? throw new ArgumentNullException(nameof(logger));
}
public async Task Handle(PendingChangeApprovedEvent notification, CancellationToken cancellationToken)
{
_logger.LogInformation(
"Handling PendingChangeApprovedEvent for notification - PendingChangeId={PendingChangeId}, EntityType={EntityType}",
notification.PendingChangeId, notification.Diff.EntityType);
try
{
// Create notification DTO
var notificationDto = new PendingChangeApprovedNotification
{
NotificationType = "PendingChangeApproved",
PendingChangeId = notification.PendingChangeId,
ToolName = notification.ToolName,
EntityType = notification.Diff.EntityType,
Operation = notification.Diff.Operation,
EntityId = notification.Diff.EntityId,
ApprovedBy = notification.ApprovedBy,
TenantId = notification.TenantId,
Timestamp = DateTime.UtcNow
};
// Send notification via SignalR
await _notificationService.NotifyPendingChangeApprovedAsync(notificationDto, cancellationToken);
_logger.LogInformation(
"PendingChangeApproved notification sent successfully - PendingChangeId={PendingChangeId}",
notification.PendingChangeId);
}
catch (Exception ex)
{
_logger.LogError(ex,
"Failed to send PendingChangeApproved notification - PendingChangeId={PendingChangeId}",
notification.PendingChangeId);
// Don't rethrow - notification failure shouldn't break the main flow
}
}
}

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@@ -0,0 +1,76 @@
using ColaFlow.Modules.Mcp.Application.DTOs.Notifications;
using ColaFlow.Modules.Mcp.Application.Services;
using ColaFlow.Modules.Mcp.Domain.Entities;
using ColaFlow.Modules.Mcp.Domain.Events;
using ColaFlow.Modules.Mcp.Domain.Repositories;
using MediatR;
using Microsoft.Extensions.Logging;
namespace ColaFlow.Modules.Mcp.Application.EventHandlers;
/// <summary>
/// Event handler that sends SignalR notifications when a PendingChange is created
/// </summary>
public class PendingChangeCreatedNotificationHandler : INotificationHandler<PendingChangeCreatedEvent>
{
private readonly IMcpNotificationService _notificationService;
private readonly IPendingChangeRepository _repository;
private readonly ILogger<PendingChangeCreatedNotificationHandler> _logger;
public PendingChangeCreatedNotificationHandler(
IMcpNotificationService notificationService,
IPendingChangeRepository repository,
ILogger<PendingChangeCreatedNotificationHandler> logger)
{
_notificationService = notificationService ?? throw new ArgumentNullException(nameof(notificationService));
_repository = repository ?? throw new ArgumentNullException(nameof(repository));
_logger = logger ?? throw new ArgumentNullException(nameof(logger));
}
public async Task Handle(PendingChangeCreatedEvent notification, CancellationToken cancellationToken)
{
_logger.LogInformation(
"Handling PendingChangeCreatedEvent - PendingChangeId={PendingChangeId}, EntityType={EntityType}, Operation={Operation}",
notification.PendingChangeId, notification.EntityType, notification.Operation);
try
{
// Get PendingChange for summary
var pendingChange = await _repository.GetByIdAsync(notification.PendingChangeId, cancellationToken);
if (pendingChange == null)
{
_logger.LogWarning(
"PendingChange not found - PendingChangeId={PendingChangeId}",
notification.PendingChangeId);
return;
}
// Create notification DTO
var notificationDto = new PendingChangeCreatedNotification
{
NotificationType = "PendingChangeCreated",
PendingChangeId = notification.PendingChangeId,
ToolName = notification.ToolName,
EntityType = notification.EntityType,
Operation = notification.Operation,
Summary = pendingChange.GetSummary(),
TenantId = notification.TenantId,
Timestamp = DateTime.UtcNow
};
// Send notification via SignalR
await _notificationService.NotifyPendingChangeCreatedAsync(notificationDto, cancellationToken);
_logger.LogInformation(
"PendingChangeCreated notification sent successfully - PendingChangeId={PendingChangeId}",
notification.PendingChangeId);
}
catch (Exception ex)
{
_logger.LogError(ex,
"Failed to send PendingChangeCreated notification - PendingChangeId={PendingChangeId}",
notification.PendingChangeId);
// Don't rethrow - notification failure shouldn't break the main flow
}
}
}

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@@ -0,0 +1,59 @@
using ColaFlow.Modules.Mcp.Application.DTOs.Notifications;
using ColaFlow.Modules.Mcp.Application.Services;
using ColaFlow.Modules.Mcp.Domain.Events;
using MediatR;
using Microsoft.Extensions.Logging;
namespace ColaFlow.Modules.Mcp.Application.EventHandlers;
/// <summary>
/// Event handler that sends SignalR notifications when a PendingChange expires
/// </summary>
public class PendingChangeExpiredNotificationHandler : INotificationHandler<PendingChangeExpiredEvent>
{
private readonly IMcpNotificationService _notificationService;
private readonly ILogger<PendingChangeExpiredNotificationHandler> _logger;
public PendingChangeExpiredNotificationHandler(
IMcpNotificationService notificationService,
ILogger<PendingChangeExpiredNotificationHandler> logger)
{
_notificationService = notificationService ?? throw new ArgumentNullException(nameof(notificationService));
_logger = logger ?? throw new ArgumentNullException(nameof(logger));
}
public async Task Handle(PendingChangeExpiredEvent notification, CancellationToken cancellationToken)
{
_logger.LogInformation(
"Handling PendingChangeExpiredEvent for notification - PendingChangeId={PendingChangeId}",
notification.PendingChangeId);
try
{
// Create notification DTO
var notificationDto = new PendingChangeExpiredNotification
{
NotificationType = "PendingChangeExpired",
PendingChangeId = notification.PendingChangeId,
ToolName = notification.ToolName,
TenantId = notification.TenantId,
ExpiredAt = DateTime.UtcNow,
Timestamp = DateTime.UtcNow
};
// Send notification via SignalR
await _notificationService.NotifyPendingChangeExpiredAsync(notificationDto, cancellationToken);
_logger.LogInformation(
"PendingChangeExpired notification sent successfully - PendingChangeId={PendingChangeId}",
notification.PendingChangeId);
}
catch (Exception ex)
{
_logger.LogError(ex,
"Failed to send PendingChangeExpired notification - PendingChangeId={PendingChangeId}",
notification.PendingChangeId);
// Don't rethrow - notification failure shouldn't break the main flow
}
}
}

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@@ -0,0 +1,60 @@
using ColaFlow.Modules.Mcp.Application.DTOs.Notifications;
using ColaFlow.Modules.Mcp.Application.Services;
using ColaFlow.Modules.Mcp.Domain.Events;
using MediatR;
using Microsoft.Extensions.Logging;
namespace ColaFlow.Modules.Mcp.Application.EventHandlers;
/// <summary>
/// Event handler that sends SignalR notifications when a PendingChange is rejected
/// </summary>
public class PendingChangeRejectedNotificationHandler : INotificationHandler<PendingChangeRejectedEvent>
{
private readonly IMcpNotificationService _notificationService;
private readonly ILogger<PendingChangeRejectedNotificationHandler> _logger;
public PendingChangeRejectedNotificationHandler(
IMcpNotificationService notificationService,
ILogger<PendingChangeRejectedNotificationHandler> logger)
{
_notificationService = notificationService ?? throw new ArgumentNullException(nameof(notificationService));
_logger = logger ?? throw new ArgumentNullException(nameof(logger));
}
public async Task Handle(PendingChangeRejectedEvent notification, CancellationToken cancellationToken)
{
_logger.LogInformation(
"Handling PendingChangeRejectedEvent for notification - PendingChangeId={PendingChangeId}, Reason={Reason}",
notification.PendingChangeId, notification.Reason);
try
{
// Create notification DTO
var notificationDto = new PendingChangeRejectedNotification
{
NotificationType = "PendingChangeRejected",
PendingChangeId = notification.PendingChangeId,
ToolName = notification.ToolName,
Reason = notification.Reason,
RejectedBy = notification.RejectedBy,
TenantId = notification.TenantId,
Timestamp = DateTime.UtcNow
};
// Send notification via SignalR
await _notificationService.NotifyPendingChangeRejectedAsync(notificationDto, cancellationToken);
_logger.LogInformation(
"PendingChangeRejected notification sent successfully - PendingChangeId={PendingChangeId}",
notification.PendingChangeId);
}
catch (Exception ex)
{
_logger.LogError(ex,
"Failed to send PendingChangeRejected notification - PendingChangeId={PendingChangeId}",
notification.PendingChangeId);
// Don't rethrow - notification failure shouldn't break the main flow
}
}
}

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@@ -0,0 +1,44 @@
using ColaFlow.Modules.Mcp.Application.DTOs.Notifications;
namespace ColaFlow.Modules.Mcp.Application.Services;
/// <summary>
/// Service for sending real-time notifications to MCP clients via SignalR
/// </summary>
public interface IMcpNotificationService
{
/// <summary>
/// Notify that a new PendingChange was created
/// </summary>
Task NotifyPendingChangeCreatedAsync(
PendingChangeCreatedNotification notification,
CancellationToken cancellationToken = default);
/// <summary>
/// Notify that a PendingChange was approved
/// </summary>
Task NotifyPendingChangeApprovedAsync(
PendingChangeApprovedNotification notification,
CancellationToken cancellationToken = default);
/// <summary>
/// Notify that a PendingChange was rejected
/// </summary>
Task NotifyPendingChangeRejectedAsync(
PendingChangeRejectedNotification notification,
CancellationToken cancellationToken = default);
/// <summary>
/// Notify that a PendingChange was applied successfully
/// </summary>
Task NotifyPendingChangeAppliedAsync(
PendingChangeAppliedNotification notification,
CancellationToken cancellationToken = default);
/// <summary>
/// Notify that a PendingChange expired
/// </summary>
Task NotifyPendingChangeExpiredAsync(
PendingChangeExpiredNotification notification,
CancellationToken cancellationToken = default);
}

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@@ -7,6 +7,7 @@ using ColaFlow.Modules.Mcp.Infrastructure.BackgroundServices;
using ColaFlow.Modules.Mcp.Infrastructure.Middleware;
using ColaFlow.Modules.Mcp.Infrastructure.Persistence;
using ColaFlow.Modules.Mcp.Infrastructure.Persistence.Repositories;
using ColaFlow.Modules.Mcp.Infrastructure.Services;
using Microsoft.AspNetCore.Builder;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
@@ -44,6 +45,9 @@ public static class McpServiceExtensions
services.AddScoped<IMcpApiKeyService, McpApiKeyService>();
services.AddScoped<IPendingChangeService, PendingChangeService>();
// Register notification service (SignalR real-time notifications)
services.AddScoped<IMcpNotificationService, McpNotificationService>();
// Register background services
services.AddHostedService<PendingChangeExpirationBackgroundService>();

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@@ -0,0 +1,135 @@
using ColaFlow.API.Hubs;
using ColaFlow.Modules.Mcp.Application.DTOs.Notifications;
using ColaFlow.Modules.Mcp.Application.Services;
using Microsoft.AspNetCore.SignalR;
using Microsoft.Extensions.Logging;
namespace ColaFlow.Modules.Mcp.Infrastructure.Services;
/// <summary>
/// Implementation of IMcpNotificationService using SignalR
/// </summary>
public class McpNotificationService : IMcpNotificationService
{
private readonly IHubContext<McpNotificationHub> _hubContext;
private readonly ILogger<McpNotificationService> _logger;
public McpNotificationService(
IHubContext<McpNotificationHub> hubContext,
ILogger<McpNotificationService> logger)
{
_hubContext = hubContext ?? throw new ArgumentNullException(nameof(hubContext));
_logger = logger ?? throw new ArgumentNullException(nameof(logger));
}
public async Task NotifyPendingChangeCreatedAsync(
PendingChangeCreatedNotification notification,
CancellationToken cancellationToken = default)
{
var groupName = GetPendingChangeGroupName(notification.PendingChangeId);
var tenantGroupName = GetTenantGroupName(notification.TenantId);
_logger.LogInformation(
"Sending PendingChangeCreated notification - PendingChangeId={PendingChangeId}, EntityType={EntityType}, Operation={Operation}",
notification.PendingChangeId, notification.EntityType, notification.Operation);
// Send to both: specific pending change subscribers AND all tenant members
await _hubContext.Clients
.Groups(groupName, tenantGroupName)
.SendAsync("PendingChangeCreated", notification, cancellationToken);
_logger.LogDebug(
"PendingChangeCreated notification sent - Groups=[{GroupName}, {TenantGroupName}]",
groupName, tenantGroupName);
}
public async Task NotifyPendingChangeApprovedAsync(
PendingChangeApprovedNotification notification,
CancellationToken cancellationToken = default)
{
var groupName = GetPendingChangeGroupName(notification.PendingChangeId);
var tenantGroupName = GetTenantGroupName(notification.TenantId);
_logger.LogInformation(
"Sending PendingChangeApproved notification - PendingChangeId={PendingChangeId}, EntityType={EntityType}, ApprovedBy={ApprovedBy}",
notification.PendingChangeId, notification.EntityType, notification.ApprovedBy);
await _hubContext.Clients
.Groups(groupName, tenantGroupName)
.SendAsync("PendingChangeApproved", notification, cancellationToken);
_logger.LogDebug(
"PendingChangeApproved notification sent - Groups=[{GroupName}, {TenantGroupName}]",
groupName, tenantGroupName);
}
public async Task NotifyPendingChangeRejectedAsync(
PendingChangeRejectedNotification notification,
CancellationToken cancellationToken = default)
{
var groupName = GetPendingChangeGroupName(notification.PendingChangeId);
var tenantGroupName = GetTenantGroupName(notification.TenantId);
_logger.LogInformation(
"Sending PendingChangeRejected notification - PendingChangeId={PendingChangeId}, Reason={Reason}, RejectedBy={RejectedBy}",
notification.PendingChangeId, notification.Reason, notification.RejectedBy);
await _hubContext.Clients
.Groups(groupName, tenantGroupName)
.SendAsync("PendingChangeRejected", notification, cancellationToken);
_logger.LogDebug(
"PendingChangeRejected notification sent - Groups=[{GroupName}, {TenantGroupName}]",
groupName, tenantGroupName);
}
public async Task NotifyPendingChangeAppliedAsync(
PendingChangeAppliedNotification notification,
CancellationToken cancellationToken = default)
{
var groupName = GetPendingChangeGroupName(notification.PendingChangeId);
var tenantGroupName = GetTenantGroupName(notification.TenantId);
_logger.LogInformation(
"Sending PendingChangeApplied notification - PendingChangeId={PendingChangeId}, Result={Result}",
notification.PendingChangeId, notification.Result);
await _hubContext.Clients
.Groups(groupName, tenantGroupName)
.SendAsync("PendingChangeApplied", notification, cancellationToken);
_logger.LogDebug(
"PendingChangeApplied notification sent - Groups=[{GroupName}, {TenantGroupName}]",
groupName, tenantGroupName);
}
public async Task NotifyPendingChangeExpiredAsync(
PendingChangeExpiredNotification notification,
CancellationToken cancellationToken = default)
{
var groupName = GetPendingChangeGroupName(notification.PendingChangeId);
var tenantGroupName = GetTenantGroupName(notification.TenantId);
_logger.LogInformation(
"Sending PendingChangeExpired notification - PendingChangeId={PendingChangeId}, ExpiredAt={ExpiredAt}",
notification.PendingChangeId, notification.ExpiredAt);
await _hubContext.Clients
.Groups(groupName, tenantGroupName)
.SendAsync("PendingChangeExpired", notification, cancellationToken);
_logger.LogDebug(
"PendingChangeExpired notification sent - Groups=[{GroupName}, {TenantGroupName}]",
groupName, tenantGroupName);
}
private static string GetPendingChangeGroupName(Guid pendingChangeId)
{
return $"pending-change-{pendingChangeId}";
}
private static string GetTenantGroupName(Guid tenantId)
{
return $"tenant-{tenantId}";
}
}

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@@ -0,0 +1,103 @@
using ColaFlow.Modules.Mcp.Application.DTOs.Notifications;
using ColaFlow.Modules.Mcp.Application.EventHandlers;
using ColaFlow.Modules.Mcp.Application.Services;
using ColaFlow.Modules.Mcp.Domain.Events;
using ColaFlow.Modules.Mcp.Domain.ValueObjects;
using Microsoft.Extensions.Logging;
using Moq;
using Xunit;
namespace ColaFlow.Modules.Mcp.Tests.EventHandlers;
public class PendingChangeApprovedNotificationHandlerTests
{
private readonly Mock<IMcpNotificationService> _mockNotificationService;
private readonly Mock<ILogger<PendingChangeApprovedNotificationHandler>> _mockLogger;
private readonly PendingChangeApprovedNotificationHandler _handler;
public PendingChangeApprovedNotificationHandlerTests()
{
_mockNotificationService = new Mock<IMcpNotificationService>();
_mockLogger = new Mock<ILogger<PendingChangeApprovedNotificationHandler>>();
_handler = new PendingChangeApprovedNotificationHandler(
_mockNotificationService.Object,
_mockLogger.Object);
}
[Fact]
public async Task Handle_SendsNotification_WithCorrectData()
{
// Arrange
var pendingChangeId = Guid.NewGuid();
var tenantId = Guid.NewGuid();
var approvedBy = Guid.NewGuid();
var entityId = Guid.NewGuid();
var diff = new DiffPreview(
"CREATE",
"Epic",
entityId,
null,
null,
"{\"name\":\"Test Epic\"}",
new List<DiffField>());
var domainEvent = new PendingChangeApprovedEvent(
pendingChangeId,
"create_epic",
diff,
approvedBy,
tenantId);
// Act
await _handler.Handle(domainEvent, CancellationToken.None);
// Assert
_mockNotificationService.Verify(
s => s.NotifyPendingChangeApprovedAsync(
It.Is<PendingChangeApprovedNotification>(n =>
n.PendingChangeId == pendingChangeId &&
n.ToolName == "create_epic" &&
n.EntityType == "Epic" &&
n.Operation == "CREATE" &&
n.EntityId == entityId &&
n.ApprovedBy == approvedBy &&
n.TenantId == tenantId),
It.IsAny<CancellationToken>()),
Times.Once);
}
[Fact]
public async Task Handle_DoesNotThrow_WhenNotificationServiceFails()
{
// Arrange
var pendingChangeId = Guid.NewGuid();
var tenantId = Guid.NewGuid();
var approvedBy = Guid.NewGuid();
var diff = new DiffPreview(
"CREATE",
"Epic",
null,
null,
null,
"{\"name\":\"Test Epic\"}",
new List<DiffField>());
var domainEvent = new PendingChangeApprovedEvent(
pendingChangeId,
"create_epic",
diff,
approvedBy,
tenantId);
_mockNotificationService.Setup(s => s.NotifyPendingChangeApprovedAsync(
It.IsAny<PendingChangeApprovedNotification>(),
It.IsAny<CancellationToken>()))
.ThrowsAsync(new Exception("SignalR connection failed"));
// Act & Assert - Should not throw
await _handler.Handle(domainEvent, CancellationToken.None);
}
}

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using ColaFlow.Modules.Mcp.Application.DTOs.Notifications;
using ColaFlow.Modules.Mcp.Application.EventHandlers;
using ColaFlow.Modules.Mcp.Application.Services;
using ColaFlow.Modules.Mcp.Domain.Entities;
using ColaFlow.Modules.Mcp.Domain.Events;
using ColaFlow.Modules.Mcp.Domain.Repositories;
using ColaFlow.Modules.Mcp.Domain.ValueObjects;
using Microsoft.Extensions.Logging;
using Moq;
using Xunit;
namespace ColaFlow.Modules.Mcp.Tests.EventHandlers;
public class PendingChangeCreatedNotificationHandlerTests
{
private readonly Mock<IMcpNotificationService> _mockNotificationService;
private readonly Mock<IPendingChangeRepository> _mockRepository;
private readonly Mock<ILogger<PendingChangeCreatedNotificationHandler>> _mockLogger;
private readonly PendingChangeCreatedNotificationHandler _handler;
public PendingChangeCreatedNotificationHandlerTests()
{
_mockNotificationService = new Mock<IMcpNotificationService>();
_mockRepository = new Mock<IPendingChangeRepository>();
_mockLogger = new Mock<ILogger<PendingChangeCreatedNotificationHandler>>();
_handler = new PendingChangeCreatedNotificationHandler(
_mockNotificationService.Object,
_mockRepository.Object,
_mockLogger.Object);
}
[Fact]
public async Task Handle_SendsNotification_WhenPendingChangeExists()
{
// Arrange
var pendingChangeId = Guid.NewGuid();
var tenantId = Guid.NewGuid();
var apiKeyId = Guid.NewGuid();
var domainEvent = new PendingChangeCreatedEvent(
pendingChangeId,
"create_epic",
"Epic",
"CREATE",
tenantId);
var diff = new DiffPreview(
"CREATE",
"Epic",
null,
null,
null,
"{\"name\":\"Test Epic\"}",
new List<DiffField>());
var pendingChange = PendingChange.Create(
"create_epic",
diff,
tenantId,
apiKeyId,
12);
_mockRepository.Setup(r => r.GetByIdAsync(pendingChangeId, It.IsAny<CancellationToken>()))
.ReturnsAsync(pendingChange);
// Act
await _handler.Handle(domainEvent, CancellationToken.None);
// Assert
_mockNotificationService.Verify(
s => s.NotifyPendingChangeCreatedAsync(
It.Is<PendingChangeCreatedNotification>(n =>
n.PendingChangeId == pendingChangeId &&
n.ToolName == "create_epic" &&
n.EntityType == "Epic" &&
n.Operation == "CREATE" &&
n.TenantId == tenantId),
It.IsAny<CancellationToken>()),
Times.Once);
}
[Fact]
public async Task Handle_DoesNotSendNotification_WhenPendingChangeNotFound()
{
// Arrange
var pendingChangeId = Guid.NewGuid();
var tenantId = Guid.NewGuid();
var domainEvent = new PendingChangeCreatedEvent(
pendingChangeId,
"create_epic",
"Epic",
"CREATE",
tenantId);
_mockRepository.Setup(r => r.GetByIdAsync(pendingChangeId, It.IsAny<CancellationToken>()))
.ReturnsAsync((PendingChange?)null);
// Act
await _handler.Handle(domainEvent, CancellationToken.None);
// Assert
_mockNotificationService.Verify(
s => s.NotifyPendingChangeCreatedAsync(
It.IsAny<PendingChangeCreatedNotification>(),
It.IsAny<CancellationToken>()),
Times.Never);
}
[Fact]
public async Task Handle_DoesNotThrow_WhenNotificationServiceFails()
{
// Arrange
var pendingChangeId = Guid.NewGuid();
var tenantId = Guid.NewGuid();
var apiKeyId = Guid.NewGuid();
var domainEvent = new PendingChangeCreatedEvent(
pendingChangeId,
"create_epic",
"Epic",
"CREATE",
tenantId);
var diff = new DiffPreview(
"CREATE",
"Epic",
null,
null,
null,
"{\"name\":\"Test Epic\"}",
new List<DiffField>());
var pendingChange = PendingChange.Create(
"create_epic",
diff,
tenantId,
apiKeyId,
12);
_mockRepository.Setup(r => r.GetByIdAsync(pendingChangeId, It.IsAny<CancellationToken>()))
.ReturnsAsync(pendingChange);
_mockNotificationService.Setup(s => s.NotifyPendingChangeCreatedAsync(
It.IsAny<PendingChangeCreatedNotification>(),
It.IsAny<CancellationToken>()))
.ThrowsAsync(new Exception("SignalR connection failed"));
// Act & Assert - Should not throw
await _handler.Handle(domainEvent, CancellationToken.None);
}
}

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using ColaFlow.API.Hubs;
using ColaFlow.Modules.Mcp.Application.DTOs.Notifications;
using ColaFlow.Modules.Mcp.Infrastructure.Services;
using Microsoft.AspNetCore.SignalR;
using Microsoft.Extensions.Logging;
using Moq;
using Xunit;
namespace ColaFlow.Modules.Mcp.Tests.Services;
public class McpNotificationServiceTests
{
private readonly Mock<IHubContext<McpNotificationHub>> _mockHubContext;
private readonly Mock<ILogger<McpNotificationService>> _mockLogger;
private readonly Mock<IHubClients> _mockClients;
private readonly Mock<IClientProxy> _mockClientProxy;
private readonly McpNotificationService _service;
public McpNotificationServiceTests()
{
_mockHubContext = new Mock<IHubContext<McpNotificationHub>>();
_mockLogger = new Mock<ILogger<McpNotificationService>>();
_mockClients = new Mock<IHubClients>();
_mockClientProxy = new Mock<IClientProxy>();
_mockHubContext.Setup(h => h.Clients).Returns(_mockClients.Object);
_service = new McpNotificationService(_mockHubContext.Object, _mockLogger.Object);
}
[Fact]
public async Task NotifyPendingChangeCreatedAsync_SendsNotificationToCorrectGroups()
{
// Arrange
var pendingChangeId = Guid.NewGuid();
var tenantId = Guid.NewGuid();
var notification = new PendingChangeCreatedNotification
{
NotificationType = "PendingChangeCreated",
PendingChangeId = pendingChangeId,
ToolName = "create_epic",
EntityType = "Epic",
Operation = "CREATE",
Summary = "Create Epic: Test Epic",
TenantId = tenantId
};
_mockClients.Setup(c => c.Groups(It.IsAny<string>(), It.IsAny<string>()))
.Returns(_mockClientProxy.Object);
// Act
await _service.NotifyPendingChangeCreatedAsync(notification);
// Assert
_mockClients.Verify(
c => c.Groups($"pending-change-{pendingChangeId}", $"tenant-{tenantId}"),
Times.Once);
_mockClientProxy.Verify(
p => p.SendCoreAsync(
"PendingChangeCreated",
It.Is<object[]>(args => args.Length == 1 && args[0] == notification),
It.IsAny<CancellationToken>()),
Times.Once);
}
[Fact]
public async Task NotifyPendingChangeApprovedAsync_SendsNotificationWithCorrectData()
{
// Arrange
var pendingChangeId = Guid.NewGuid();
var tenantId = Guid.NewGuid();
var approvedBy = Guid.NewGuid();
var entityId = Guid.NewGuid();
var notification = new PendingChangeApprovedNotification
{
NotificationType = "PendingChangeApproved",
PendingChangeId = pendingChangeId,
ToolName = "create_epic",
EntityType = "Epic",
Operation = "CREATE",
EntityId = entityId,
ApprovedBy = approvedBy,
ExecutionResult = "Epic created: Test Epic",
TenantId = tenantId
};
_mockClients.Setup(c => c.Groups(It.IsAny<string>(), It.IsAny<string>()))
.Returns(_mockClientProxy.Object);
// Act
await _service.NotifyPendingChangeApprovedAsync(notification);
// Assert
_mockClientProxy.Verify(
p => p.SendCoreAsync(
"PendingChangeApproved",
It.Is<object[]>(args =>
args.Length == 1 &&
((PendingChangeApprovedNotification)args[0]).ApprovedBy == approvedBy &&
((PendingChangeApprovedNotification)args[0]).EntityId == entityId),
It.IsAny<CancellationToken>()),
Times.Once);
}
[Fact]
public async Task NotifyPendingChangeRejectedAsync_SendsNotificationWithReason()
{
// Arrange
var pendingChangeId = Guid.NewGuid();
var tenantId = Guid.NewGuid();
var rejectedBy = Guid.NewGuid();
var reason = "Epic name is too vague";
var notification = new PendingChangeRejectedNotification
{
NotificationType = "PendingChangeRejected",
PendingChangeId = pendingChangeId,
ToolName = "create_epic",
Reason = reason,
RejectedBy = rejectedBy,
TenantId = tenantId
};
_mockClients.Setup(c => c.Groups(It.IsAny<string>(), It.IsAny<string>()))
.Returns(_mockClientProxy.Object);
// Act
await _service.NotifyPendingChangeRejectedAsync(notification);
// Assert
_mockClientProxy.Verify(
p => p.SendCoreAsync(
"PendingChangeRejected",
It.Is<object[]>(args =>
args.Length == 1 &&
((PendingChangeRejectedNotification)args[0]).Reason == reason &&
((PendingChangeRejectedNotification)args[0]).RejectedBy == rejectedBy),
It.IsAny<CancellationToken>()),
Times.Once);
}
[Fact]
public async Task NotifyPendingChangeAppliedAsync_SendsNotificationWithResult()
{
// Arrange
var pendingChangeId = Guid.NewGuid();
var tenantId = Guid.NewGuid();
var result = "Epic created: abc123 - Test Epic";
var notification = new PendingChangeAppliedNotification
{
NotificationType = "PendingChangeApplied",
PendingChangeId = pendingChangeId,
ToolName = "create_epic",
Result = result,
AppliedAt = DateTime.UtcNow,
TenantId = tenantId
};
_mockClients.Setup(c => c.Groups(It.IsAny<string>(), It.IsAny<string>()))
.Returns(_mockClientProxy.Object);
// Act
await _service.NotifyPendingChangeAppliedAsync(notification);
// Assert
_mockClientProxy.Verify(
p => p.SendCoreAsync(
"PendingChangeApplied",
It.Is<object[]>(args =>
args.Length == 1 &&
((PendingChangeAppliedNotification)args[0]).Result == result),
It.IsAny<CancellationToken>()),
Times.Once);
}
[Fact]
public async Task NotifyPendingChangeExpiredAsync_SendsNotificationToCorrectGroups()
{
// Arrange
var pendingChangeId = Guid.NewGuid();
var tenantId = Guid.NewGuid();
var notification = new PendingChangeExpiredNotification
{
NotificationType = "PendingChangeExpired",
PendingChangeId = pendingChangeId,
ToolName = "create_epic",
ExpiredAt = DateTime.UtcNow,
TenantId = tenantId
};
_mockClients.Setup(c => c.Groups(It.IsAny<string>(), It.IsAny<string>()))
.Returns(_mockClientProxy.Object);
// Act
await _service.NotifyPendingChangeExpiredAsync(notification);
// Assert
_mockClients.Verify(
c => c.Groups($"pending-change-{pendingChangeId}", $"tenant-{tenantId}"),
Times.Once);
_mockClientProxy.Verify(
p => p.SendCoreAsync(
"PendingChangeExpired",
It.Is<object[]>(args => args.Length == 1),
It.IsAny<CancellationToken>()),
Times.Once);
}
[Fact]
public void Constructor_ThrowsArgumentNullException_WhenHubContextIsNull()
{
// Act & Assert
var exception = Assert.Throws<ArgumentNullException>(() =>
new McpNotificationService(null!, _mockLogger.Object));
Assert.Equal("hubContext", exception.ParamName);
}
[Fact]
public void Constructor_ThrowsArgumentNullException_WhenLoggerIsNull()
{
// Act & Assert
var exception = Assert.Throws<ArgumentNullException>(() =>
new McpNotificationService(_mockHubContext.Object, null!));
Assert.Equal("logger", exception.ParamName);
}
}

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# SignalR MCP Notifications Client Integration Guide
## Overview
This guide explains how to integrate with ColaFlow's MCP SignalR Hub to receive real-time notifications about PendingChange status updates.
## Hub Endpoint
```
wss://your-colaflow-instance.com/hubs/mcp-notifications
```
## Authentication
The hub requires JWT authentication. Pass the JWT token in the query string:
```
wss://your-colaflow-instance.com/hubs/mcp-notifications?access_token=YOUR_JWT_TOKEN
```
## Notification Types
The hub sends the following notification types:
1. **PendingChangeCreated** - A new PendingChange was created
2. **PendingChangeApproved** - A PendingChange was approved
3. **PendingChangeRejected** - A PendingChange was rejected
4. **PendingChangeApplied** - A PendingChange was successfully applied
5. **PendingChangeExpired** - A PendingChange expired (timeout)
## Client Implementation Examples
### JavaScript/TypeScript (SignalR Client)
```typescript
import * as signalR from "@microsoft/signalr";
// Create connection
const connection = new signalR.HubConnectionBuilder()
.withUrl("https://your-colaflow-instance.com/hubs/mcp-notifications", {
accessTokenFactory: () => localStorage.getItem("jwt_token") || "",
})
.withAutomaticReconnect() // Auto-reconnect on disconnect
.configureLogging(signalR.LogLevel.Information)
.build();
// Subscribe to PendingChangeCreated
connection.on("PendingChangeCreated", (notification) => {
console.log("New PendingChange created:", notification);
console.log("Summary:", notification.summary);
console.log("Entity Type:", notification.entityType);
console.log("Operation:", notification.operation);
});
// Subscribe to PendingChangeApproved
connection.on("PendingChangeApproved", (notification) => {
console.log("PendingChange approved:", notification);
console.log("Approved by:", notification.approvedBy);
console.log("Entity ID:", notification.entityId);
});
// Subscribe to PendingChangeRejected
connection.on("PendingChangeRejected", (notification) => {
console.log("PendingChange rejected:", notification);
console.log("Reason:", notification.reason);
console.log("Rejected by:", notification.rejectedBy);
});
// Subscribe to PendingChangeApplied
connection.on("PendingChangeApplied", (notification) => {
console.log("PendingChange applied:", notification);
console.log("Result:", notification.result);
});
// Subscribe to PendingChangeExpired
connection.on("PendingChangeExpired", (notification) => {
console.log("PendingChange expired:", notification);
});
// Start connection
async function start() {
try {
await connection.start();
console.log("SignalR Connected");
} catch (err) {
console.error("SignalR Connection Error:", err);
setTimeout(start, 5000); // Retry after 5 seconds
}
}
// Handle disconnection
connection.onclose(async () => {
console.log("SignalR Disconnected");
await start(); // Reconnect
});
// Start the connection
start();
```
### React Hook
```typescript
import { useEffect, useState } from "react";
import * as signalR from "@microsoft/signalr";
export function useMcpNotifications(jwtToken: string) {
const [connection, setConnection] = useState<signalR.HubConnection | null>(null);
const [isConnected, setIsConnected] = useState(false);
useEffect(() => {
const newConnection = new signalR.HubConnectionBuilder()
.withUrl("https://your-colaflow-instance.com/hubs/mcp-notifications", {
accessTokenFactory: () => jwtToken,
})
.withAutomaticReconnect()
.build();
setConnection(newConnection);
return () => {
newConnection.stop();
};
}, [jwtToken]);
useEffect(() => {
if (connection) {
connection
.start()
.then(() => {
console.log("SignalR Connected");
setIsConnected(true);
})
.catch((err) => {
console.error("SignalR Connection Error:", err);
setIsConnected(false);
});
connection.onclose(() => {
console.log("SignalR Disconnected");
setIsConnected(false);
});
}
}, [connection]);
return { connection, isConnected };
}
// Usage in a component
function MyComponent() {
const jwtToken = localStorage.getItem("jwt_token") || "";
const { connection, isConnected } = useMcpNotifications(jwtToken);
useEffect(() => {
if (!connection) return;
// Subscribe to notifications
connection.on("PendingChangeCreated", (notification) => {
console.log("New PendingChange:", notification);
// Update UI, show toast, etc.
});
connection.on("PendingChangeApproved", (notification) => {
console.log("PendingChange approved:", notification);
// Update UI, show success message, etc.
});
connection.on("PendingChangeRejected", (notification) => {
console.log("PendingChange rejected:", notification);
// Update UI, show error message, etc.
});
// Cleanup
return () => {
connection.off("PendingChangeCreated");
connection.off("PendingChangeApproved");
connection.off("PendingChangeRejected");
};
}, [connection]);
return (
<div>
<p>Connection Status: {isConnected ? "Connected" : "Disconnected"}</p>
</div>
);
}
```
### Python (AI Agent)
```python
import asyncio
import json
from signalrcore.hub_connection_builder import HubConnectionBuilder
class McpNotificationClient:
def __init__(self, hub_url: str, jwt_token: str):
self.hub_url = hub_url
self.jwt_token = jwt_token
self.connection = None
def on_pending_change_created(self, notification):
print(f"PendingChange created: {notification}")
print(f"Summary: {notification['summary']}")
def on_pending_change_approved(self, notification):
print(f"PendingChange approved: {notification}")
print(f"Entity ID: {notification['entityId']}")
# Continue AI workflow...
def on_pending_change_rejected(self, notification):
print(f"PendingChange rejected: {notification}")
print(f"Reason: {notification['reason']}")
# Adjust AI behavior...
def on_pending_change_applied(self, notification):
print(f"PendingChange applied: {notification}")
print(f"Result: {notification['result']}")
def on_pending_change_expired(self, notification):
print(f"PendingChange expired: {notification}")
async def start(self):
self.connection = HubConnectionBuilder()\
.with_url(f"{self.hub_url}?access_token={self.jwt_token}")\
.with_automatic_reconnect({
"type": "interval",
"intervals": [0, 2, 10, 30]
})\
.build()
# Register event handlers
self.connection.on("PendingChangeCreated", self.on_pending_change_created)
self.connection.on("PendingChangeApproved", self.on_pending_change_approved)
self.connection.on("PendingChangeRejected", self.on_pending_change_rejected)
self.connection.on("PendingChangeApplied", self.on_pending_change_applied)
self.connection.on("PendingChangeExpired", self.on_pending_change_expired)
# Start connection
self.connection.start()
print("SignalR Connected")
async def subscribe_to_pending_change(self, pending_change_id: str):
"""Subscribe to notifications for a specific pending change"""
await self.connection.invoke("SubscribeToPendingChange", pending_change_id)
print(f"Subscribed to PendingChange {pending_change_id}")
async def unsubscribe_from_pending_change(self, pending_change_id: str):
"""Unsubscribe from notifications for a specific pending change"""
await self.connection.invoke("UnsubscribeFromPendingChange", pending_change_id)
print(f"Unsubscribed from PendingChange {pending_change_id}")
def stop(self):
if self.connection:
self.connection.stop()
# Usage
async def main():
client = McpNotificationClient(
hub_url="https://your-colaflow-instance.com/hubs/mcp-notifications",
jwt_token="YOUR_JWT_TOKEN"
)
await client.start()
# Subscribe to a specific pending change
await client.subscribe_to_pending_change("123e4567-e89b-12d3-a456-426614174000")
# Keep running
await asyncio.sleep(3600) # Run for 1 hour
client.stop()
if __name__ == "__main__":
asyncio.run(main())
```
## Hub Methods
### SubscribeToPendingChange
Subscribe to receive notifications for a specific pending change.
```typescript
await connection.invoke("SubscribeToPendingChange", pendingChangeId);
```
**Parameters:**
- `pendingChangeId` (Guid/string): The ID of the pending change to subscribe to
### UnsubscribeFromPendingChange
Unsubscribe from receiving notifications for a specific pending change.
```typescript
await connection.invoke("UnsubscribeFromPendingChange", pendingChangeId);
```
**Parameters:**
- `pendingChangeId` (Guid/string): The ID of the pending change to unsubscribe from
## Notification Payloads
### PendingChangeCreatedNotification
```json
{
"notificationType": "PendingChangeCreated",
"pendingChangeId": "123e4567-e89b-12d3-a456-426614174000",
"toolName": "create_epic",
"entityType": "Epic",
"operation": "CREATE",
"summary": "Create Epic: Implement User Authentication",
"tenantId": "456e7890-e89b-12d3-a456-426614174000",
"timestamp": "2025-01-15T10:30:00Z"
}
```
### PendingChangeApprovedNotification
```json
{
"notificationType": "PendingChangeApproved",
"pendingChangeId": "123e4567-e89b-12d3-a456-426614174000",
"toolName": "create_epic",
"entityType": "Epic",
"operation": "CREATE",
"entityId": "789e0123-e89b-12d3-a456-426614174000",
"approvedBy": "234e5678-e89b-12d3-a456-426614174000",
"executionResult": "Epic created: 789e0123-e89b-12d3-a456-426614174000 - Implement User Authentication",
"tenantId": "456e7890-e89b-12d3-a456-426614174000",
"timestamp": "2025-01-15T10:31:00Z"
}
```
### PendingChangeRejectedNotification
```json
{
"notificationType": "PendingChangeRejected",
"pendingChangeId": "123e4567-e89b-12d3-a456-426614174000",
"toolName": "create_epic",
"reason": "Epic name is too vague, please provide more details",
"rejectedBy": "234e5678-e89b-12d3-a456-426614174000",
"tenantId": "456e7890-e89b-12d3-a456-426614174000",
"timestamp": "2025-01-15T10:31:00Z"
}
```
### PendingChangeAppliedNotification
```json
{
"notificationType": "PendingChangeApplied",
"pendingChangeId": "123e4567-e89b-12d3-a456-426614174000",
"toolName": "create_epic",
"result": "Epic created: 789e0123-e89b-12d3-a456-426614174000 - Implement User Authentication",
"appliedAt": "2025-01-15T10:31:05Z",
"tenantId": "456e7890-e89b-12d3-a456-426614174000",
"timestamp": "2025-01-15T10:31:05Z"
}
```
### PendingChangeExpiredNotification
```json
{
"notificationType": "PendingChangeExpired",
"pendingChangeId": "123e4567-e89b-12d3-a456-426614174000",
"toolName": "create_epic",
"expiredAt": "2025-01-15T22:30:00Z",
"tenantId": "456e7890-e89b-12d3-a456-426614174000",
"timestamp": "2025-01-15T22:30:00Z"
}
```
## Tenant Isolation
All notifications are automatically isolated by tenant. When you connect, you are automatically added to your tenant's group, and you will only receive notifications for PendingChanges belonging to your tenant.
## Connection Lifecycle
1. **Connect**: Establish WebSocket connection with JWT token
2. **Automatic Tenant Group Join**: Server automatically adds you to your tenant's group
3. **Subscribe**: Optionally subscribe to specific pending changes
4. **Receive Notifications**: Get real-time updates
5. **Unsubscribe**: Optionally unsubscribe from specific pending changes
6. **Disconnect**: Close connection when done
## Error Handling
```typescript
connection.onreconnecting((error) => {
console.warn("SignalR Reconnecting:", error);
});
connection.onreconnected((connectionId) => {
console.log("SignalR Reconnected:", connectionId);
});
connection.onclose((error) => {
console.error("SignalR Connection Closed:", error);
// Implement custom reconnection logic if needed
});
```
## Best Practices
1. **Use Automatic Reconnect**: Always enable `.withAutomaticReconnect()` to handle temporary disconnections
2. **Subscribe Selectively**: Only subscribe to specific pending changes you care about
3. **Clean Up**: Always unsubscribe and close connections when done
4. **Error Handling**: Implement proper error handling for network failures
5. **Token Refresh**: Refresh JWT tokens before they expire to maintain connection
6. **Logging**: Enable appropriate logging level for debugging
## Fallback Strategy
If SignalR/WebSocket is not available or fails, you can fall back to polling:
```typescript
// Fallback to polling if SignalR fails
async function pollPendingChange(pendingChangeId: string) {
const interval = setInterval(async () => {
try {
const response = await fetch(
`https://api.colaflow.com/api/mcp/pending-changes/${pendingChangeId}`,
{
headers: {
Authorization: `Bearer ${jwtToken}`,
},
}
);
const pendingChange = await response.json();
if (pendingChange.status === "Approved" || pendingChange.status === "Rejected") {
clearInterval(interval);
console.log("PendingChange status updated:", pendingChange.status);
}
} catch (error) {
console.error("Polling error:", error);
}
}, 2000); // Poll every 2 seconds
}
```
## Performance Considerations
- **Connection Reuse**: Reuse a single SignalR connection for multiple subscriptions
- **Selective Subscriptions**: Only subscribe to pending changes you need to track
- **Bandwidth**: SignalR uses WebSocket, which is much more efficient than polling
- **Scalability**: The server uses SignalR Groups for efficient message routing
## Troubleshooting
### Connection Fails
- Verify JWT token is valid and not expired
- Check CORS settings if connecting from a browser
- Ensure WebSocket is not blocked by firewall/proxy
### Not Receiving Notifications
- Verify you're connected (check `connection.state === HubConnectionState.Connected`)
- Check tenant ID matches the PendingChange's tenant
- Verify you've subscribed to the pending change (if using selective subscriptions)
### Notifications Delayed
- Check network latency
- Verify server is not under heavy load
- Check if automatic reconnect is triggering frequently (network instability)
## Support
For issues or questions, please contact the ColaFlow development team or open an issue in the repository.

View File

@@ -2,12 +2,13 @@
story_id: story_5_12
sprint_id: sprint_5
phase: Phase 3 - Tools & Diff Preview
status: not_started
status: completed
priority: P0
story_points: 3
assignee: backend
estimated_days: 1
created_date: 2025-11-06
completion_date: 2025-11-09
dependencies: [story_5_10]
---