WebSocket Implementation

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WebSocket System

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Architecture

1. Server Components:
   • TherapyChatWebSocketServer: Handles therapy chat sessions
   • WebSocketServer: Manages notifications
   • AnalyticsService: Provides real-time analytics updates
2. Client Components:
   • useWebSocket hook: React hook for WebSocket connections
   • WebSocket integration in various components
3. Security Layer:
   • FHE encryption for sensitive messages
   • Session management
   • Authentication and authorization

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Server-Side Implementation

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Therapy Chat Server

class TherapyChatWebSocketServer {
  // Handles therapy chat sessions with FHE support
  // Manages client connections and message routing
  // Implements session-based communication
}

• Session management for group therapy
• FHE message encryption
• Error handling and logging
• Broadcast capabilities
• Client tracking

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Notification Server

class WebSocketServer {
  // Manages real-time notifications
  // Handles user authentication
  // Tracks notification delivery
}

• User-specific notifications
• Message queuing
• Delivery tracking
• Error handling

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Analytics Integration

class AnalyticsService {
  // Provides real-time analytics updates
  // Manages client subscriptions
  // Handles secure data transmission
}

• Real-time metrics updates
• Secure data transmission
• Client subscription management
• Performance monitoring

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Client-Side Implementation

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useWebSocket Hook

function useWebSocket({
  url,
  sessionId,
  onMessage,
  onStatusChange,
  onError,
  encrypted = false,
}: WebSocketHookOptions) {
  // Manages WebSocket connections
  // Handles reconnection
  // Provides message sending capabilities
}

• Automatic reconnection
• Message encryption
• Error handling
• Status management
• Type-safe messaging

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Usage Example

const { isConnected, sendMessage, error } = useWebSocket({
  url: 'wss://your-server/ws',
  sessionId: 'therapy-session-id',
  onMessage: (message) => {
    // Handle incoming messages
  },
  encrypted: true,
})

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Security Considerations

1. Message Encryption:
   • FHE encryption for sensitive data
   • End-to-end encryption support
   • Secure key management
2. Authentication:
   • Token-based authentication
   • Session validation
   • User authorization
3. Error Handling:
   • Graceful error recovery
   • Secure error logging
   • Rate limiting

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Testing

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Best Practices

1. Connection Management:
   • Implement heartbeat mechanism
   • Handle reconnection gracefully
   • Clean up resources on disconnect
2. Message Handling:
   • Validate message format
   • Handle large messages appropriately
   • Implement retry logic for failed sends
3. Security:
   • Use secure WebSocket (WSS)
   • Implement proper authentication
   • Encrypt sensitive data
   • Follow HIPAA guidelines
4. Error Handling:
   • Log errors appropriately
   • Provide meaningful error messages
   • Implement fallback mechanisms

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Monitoring

1. Connection Metrics:
   • Active connections
   • Connection duration
   • Reconnection attempts
2. Message Metrics:
   • Message throughput
   • Message size
   • Error rates
3. Performance Metrics:
   • Latency
   • Message processing time
   • Memory usage

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Troubleshooting

1. Connection Issues:
   • Check network connectivity
   • Verify WebSocket URL
   • Check SSL certificates
2. Authentication Errors:
   • Verify token validity
   • Check user permissions
   • Ensure proper session management
3. Performance Issues:
   • Monitor message size
   • Check connection count
   • Review server resources

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API Reference

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Server Methods

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Client Methods

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Events