🔄 TASK-007.2.2 - WebSocket Real-time Integration

[tim-gameplan]

TASK-007.2.2 - WebSocket Real-time Integration

Parent Task: TASK-007.2 - API Layer Implementation
Phase: 2 - Real-time Features (Week 3)
Duration: 2-3 days
Priority: High
Status: Ready to start
Dependencies: ✅ TASK-007.2.1.4 (Conversation Management API completed)

📋 Overview

Integrate existing WebSocket services with the new database-backed REST API endpoints to create a complete real-time communication system. This task bridges the gap between persistent storage and real-time messaging, enabling seamless cross-device synchronization.

🎯 Objectives

Primary Goals

1. Database-WebSocket Integration: Connect real-time services to conversation/message APIs
2. Real-time Message Broadcasting: Live message delivery across all connected devices
3. Presence Management: Real-time user presence with database persistence
4. Typing Indicators: Live typing status with conversation context
5. Cross-Device Sync: Seamless message synchronization across devices

Technical Requirements

• Integration of existing WebSocket services with database APIs
• Real-time event broadcasting for database changes
• Message delivery confirmations and read receipts
• Presence management with database backing
• Conflict resolution for concurrent operations
• Performance optimization for high-throughput messaging

🔧 Integration Architecture

WebSocket Event Flow

sequenceDiagram
    participant Client as Mobile/Desktop Client
    participant WS as WebSocket Manager
    participant API as REST API
    participant DB as PostgreSQL
    participant Broadcast as Event Broadcaster

    Client->>WS: Send Message
    WS->>API: POST /api/conversations/:id/messages
    API->>DB: Insert message
    DB-->>API: Message created
    API-->>WS: Message response
    WS->>Broadcast: Broadcast message event
    Broadcast->>WS: Notify all participants
    WS->>Client: Real-time message delivery

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Core Integration Points

1. Message Operations: WebSocket ↔ Conversation API
2. Presence Management: WebSocket ↔ User API
3. Typing Indicators: WebSocket ↔ Conversation API
4. Device Coordination: WebSocket ↔ Device Management

📊 WebSocket Events

Message Events

// Outgoing Events (Server → Client)
interface MessageEvents {
  'message:created': {
    conversationId: string;
    message: Message;
    sender: User;
  };
  'message:updated': {
    conversationId: string;
    messageId: string;
    content: string;
    editedAt: Date;
  };
  'message:deleted': {
    conversationId: string;
    messageId: string;
    deletedAt: Date;
  };
  'message:delivered': {
    messageId: string;
    deliveredTo: string[];
  };
  'message:read': {
    messageId: string;
    readBy: string;
    readAt: Date;
  };
}

// Incoming Events (Client → Server)
interface ClientEvents {
  'message:send': {
    conversationId: string;
    content: string;
    type: 'text' | 'file' | 'image';
    replyTo?: string;
  };
  'message:edit': {
    messageId: string;
    content: string;
  };
  'message:delete': {
    messageId: string;
  };
  'message:mark_read': {
    messageId: string;
  };
}

Presence Events

interface PresenceEvents {
  'presence:online': {
    userId: string;
    deviceId: string;
    lastSeen: Date;
  };
  'presence:offline': {
    userId: string;
    deviceId: string;
    lastSeen: Date;
  };
  'typing:start': {
    conversationId: string;
    userId: string;
  };
  'typing:stop': {
    conversationId: string;
    userId: string;
  };
}

🔧 Implementation Tasks

1. Enhanced WebSocket Manager (production-ccs/src/services/websocket-integration.ts)

import { WebSocketManager } from './websocket-manager';
import { ConversationService } from './conversation';
import { EventBroadcaster } from './event-broadcaster';

export class WebSocketIntegration {
  constructor(
    private wsManager: WebSocketManager,
    private conversationService: ConversationService,
    private eventBroadcaster: EventBroadcaster
  ) {}

  async handleMessageSend(socket: WebSocket, data: MessageSendEvent) {
    try {
      // Create message via API
      const message = await this.conversationService.createMessage(
        data.conversationId,
        {
          content: data.content,
          type: data.type,
          senderId: socket.userId,
          replyTo: data.replyTo
        }
      );

      // Broadcast to all conversation participants
      await this.eventBroadcaster.broadcastToConversation(
        data.conversationId,
        'message:created',
        {
          conversationId: data.conversationId,
          message,
          sender: socket.user
        }
      );

      // Send delivery confirmation
      socket.emit('message:delivered', {
        messageId: message.id,
        deliveredTo: await this.getConversationParticipants(data.conversationId)
      });
    } catch (error) {
      socket.emit('error', {
        event: 'message:send',
        error: error.message
      });
    }
  }
}

2. Real-time Message Broadcasting (production-ccs/src/services/message-broadcaster.ts)

• Integration with conversation API for message persistence
• Real-time delivery to all conversation participants
• Message status tracking (sent, delivered, read)
• Cross-device synchronization

3. Enhanced Presence Management (production-ccs/src/services/presence-integration.ts)

• Database-backed presence status
• Real-time presence updates
• Device-specific presence tracking
• Conversation-level presence indicators

4. Typing Indicators Integration (production-ccs/src/services/typing-integration.ts)

• Conversation-aware typing indicators
• Database persistence for typing state
• Real-time typing notifications
• Automatic timeout handling

🧪 Testing Requirements

Unit Tests

• WebSocket-API integration functions
• Message broadcasting logic
• Presence management integration
• Typing indicator functionality
• Error handling and recovery

Integration Tests

• End-to-end message flow (WebSocket → API → Database → Broadcast)
• Multi-device message synchronization
• Presence updates across devices
• Typing indicators in real conversations
• Connection handling and reconnection

Performance Tests

• High-throughput message broadcasting
• Concurrent user handling
• Memory usage under load
• WebSocket connection scaling
• Database query performance

📋 Acceptance Criteria

Functional Requirements

• Messages sent via WebSocket are persisted to database
• Real-time message delivery works across all connected devices
• Presence status updates in real-time with database backing
• Typing indicators work within conversation context
• Message read receipts are tracked and broadcasted
• Cross-device synchronization maintains consistency

Performance Requirements

• <50ms latency for real-time message delivery
• <100ms for presence updates
• Support 100+ concurrent users per conversation
• Handle 1000+ messages per minute per conversation
• Maintain stable memory usage under load

Reliability Requirements

• Graceful handling of WebSocket disconnections
• Message delivery guarantees with retry logic
• Conflict resolution for concurrent operations
• Database transaction consistency
• Error recovery and logging

🔗 Dependencies

Completed Prerequisites

• ✅ TASK-007.2.1.4: Conversation Management API Endpoints (Complete)
• ✅ WebSocket Infrastructure: Basic WebSocket services (Complete)
• ✅ Event Broadcasting: Core event system (Complete)
• ✅ Database Schema: Conversation and message tables (Complete)

Blocks Future Issues

• TASK-007.2.3: File Upload/Download APIs
• TASK-007.3: Advanced Features (Search, Analytics)
• Mobile App Integration: Real-time messaging

📁 File Structure

production-ccs/src/
├── services/
│   ├── websocket-integration.ts    # 🆕 Main integration service
│   ├── message-broadcaster.ts      # 🆕 Real-time message broadcasting
│   ├── presence-integration.ts     # 🆕 Enhanced presence management
│   ├── typing-integration.ts       # 🆕 Typing indicators integration
│   └── real-time-sync.ts          # 🆕 Cross-device synchronization
├── middleware/
│   └── websocket-auth.ts           # 🔄 Enhanced WebSocket authentication
├── types/
│   └── websocket-events.ts         # 🆕 WebSocket event type definitions
└── tests/
    ├── websocket-integration.test.ts # 🆕 Integration tests
    └── real-time/
        ├── message-flow.test.ts    # 🆕 End-to-end message tests
        └── presence.test.ts        # 🆕 Presence integration tests

🚀 Implementation Plan

Day 1: Core Integration

• Create WebSocket-API integration service
• Implement message broadcasting with database persistence
• Add WebSocket authentication middleware
• Create event type definitions

Day 2: Real-time Features

• Implement enhanced presence management
• Add typing indicators integration
• Create cross-device synchronization
• Add message status tracking

Day 3: Testing & Optimization

• Complete integration testing
• Performance optimization and load testing
• Error handling and recovery mechanisms
• Documentation and monitoring setup

📈 Success Metrics

• Real-time Latency: <50ms for message delivery
• Presence Updates: <100ms for status changes
• Concurrent Users: Support 100+ users per conversation
• Message Throughput: Handle 1000+ messages/minute
• Reliability: 99.9% message delivery success rate
• Test Coverage: >95% for integration code

🎯 Next Steps After Completion

1. TASK-007.2.3: File Upload/Download APIs
2. Performance Monitoring: Real-time metrics and analytics
3. Advanced Features: Message reactions, mentions, threading
4. Mobile Integration: Optimized mobile real-time messaging

📚 Related Documentation

• Real-time Architecture
• WebSocket Manager
• Conversation API
• Event Broadcasting Service

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Created: 2025-06-23
Estimated Effort: 16-24 hours
Team Assignment: Senior Backend Developer
Ready for: Implementation after Issue #25