@codai/cbd/dist/features/realtime-sync.js

Codai Better Database - High-Performance Vector Memory System with HPKV-inspired architecture and MCP server

/**
 * Real-time Data Synchronization and Streaming
 * WebSocket streaming, live updates, conflict resolution, multi-instance sync
 */
import { EventEmitter } from 'events';
import { WebSocket, WebSocketServer } from 'ws';
import { performance } from 'perf_hooks';
class RealtimeDataSynchronization extends EventEmitter {
    config;
    wsServer = null;
    socketIOServer = null;
    activeConnections = new Map();
    subscriptions = new Map();
    syncEventQueue = [];
    instanceId;
    vectorClock = new Map();
    conflictResolver;
    replicationManager;
    performanceMetrics = new Map();
    constructor(config) {
        super();
        this.config = config;
        this.instanceId = `instance_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
        this.conflictResolver = new ConflictResolver(config.conflictResolution);
        this.replicationManager = new ReplicationManager(config.replicationStrategy);
        this.initializeRealtimeSync();
    }
    initializeRealtimeSync() {
        // Initialize WebSocket server
        if (this.config.enableWebSocket) {
            this.setupWebSocketServer();
        }
        // Initialize Socket.IO server
        if (this.config.enableSocketIO) {
            this.setupSocketIOServer();
        }
        // Initialize SSE endpoints
        if (this.config.enableSSE) {
            this.setupServerSentEvents();
        }
        // Setup heartbeat and cleanup
        this.setupHeartbeat();
        this.setupCleanup();
        // Initialize performance monitoring
        this.setupPerformanceMonitoring();
    }
    /**
     * WebSocket Server Setup and Management
     */
    setupWebSocketServer() {
        this.wsServer = new WebSocketServer({
            port: this.config.port,
            maxPayload: 10 * 1024 * 1024 // 10MB max payload
        });
        this.wsServer.on('connection', (ws, request) => {
            const clientId = this.generateClientId(request);
            this.activeConnections.set(clientId, ws);
            this.emit('clientConnected', { clientId, timestamp: Date.now() });
            // Handle incoming messages
            ws.on('message', async (data) => {
                try {
                    const message = JSON.parse(data.toString());
                    await this.handleClientMessage(clientId, message);
                }
                catch (error) {
                    this.emit('messageError', { clientId, error });
                    ws.send(JSON.stringify({
                        type: 'error',
                        message: 'Invalid message format'
                    }));
                }
            });
            // Handle client disconnect
            ws.on('close', () => {
                this.handleClientDisconnect(clientId);
            });
            // Handle errors
            ws.on('error', (error) => {
                this.emit('clientError', { clientId, error });
                this.handleClientDisconnect(clientId);
            });
            // Send welcome message
            ws.send(JSON.stringify({
                type: 'welcome',
                clientId,
                instanceId: this.instanceId,
                capabilities: ['realtime-sync', 'live-queries', 'conflict-resolution']
            }));
        });
        this.emit('websocketServerStarted', { port: this.config.port });
    }
    /**
     * Real-time Data Streaming
     */
    async createLiveSubscription(clientId, collection, query, options = {}) {
        const subscriptionId = `sub_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
        const subscription = {
            id: subscriptionId,
            clientId,
            collection,
            query,
            filters: options.filters,
            transformations: options.transformations,
            active: true,
            createdAt: new Date(),
            lastActivity: new Date()
        };
        this.subscriptions.set(subscriptionId, subscription);
        // Send initial data if requested
        if (options.initialData) {
            await this.sendInitialData(clientId, subscription);
        }
        this.emit('subscriptionCreated', {
            subscriptionId,
            clientId,
            collection,
            hasQuery: !!query
        });
        return subscription;
    }
    /**
     * Broadcast Data Changes
     */
    async broadcastDataChange(collection, changeType, documentId, data, options = {}) {
        const startTime = performance.now();
        let messagesSent = 0;
        let failedDeliveries = 0;
        try {
            // Create sync event
            const syncEvent = {
                id: `event_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`,
                type: changeType,
                collection,
                documentId,
                data,
                timestamp: Date.now(),
                sourceInstance: this.instanceId,
                vectorClock: new Map(this.vectorClock),
                checksum: this.generateChecksum(data)
            };
            // Update vector clock
            this.vectorClock.set(this.instanceId, (this.vectorClock.get(this.instanceId) || 0) + 1);
            // Add to sync queue for replication
            this.syncEventQueue.push(syncEvent);
            // Find relevant subscriptions
            const relevantSubscriptions = Array.from(this.subscriptions.values())
                .filter(sub => {
                if (!sub.active || sub.collection !== collection)
                    return false;
                if (options.excludeClient && sub.clientId === options.excludeClient)
                    return false;
                if (options.includeOnly && !options.includeOnly.includes(sub.clientId))
                    return false;
                return true;
            });
            // Send to each relevant client
            for (const subscription of relevantSubscriptions) {
                try {
                    const processedData = await this.processDataForClient(syncEvent, subscription);
                    if (processedData !== null) {
                        await this.sendToClient(subscription.clientId, {
                            type: 'dataChange',
                            subscriptionId: subscription.id,
                            changeType,
                            collection,
                            documentId,
                            data: processedData,
                            timestamp: syncEvent.timestamp
                        });
                        messagesSent++;
                    }
                }
                catch (error) {
                    failedDeliveries++;
                    this.emit('deliveryError', {
                        clientId: subscription.clientId,
                        subscriptionId: subscription.id,
                        error
                    });
                }
            }
            // Replicate to other instances
            await this.replicationManager.replicateEvent(syncEvent);
            const processingTime = performance.now() - startTime;
            this.emit('dataChangeBroadcast', {
                collection,
                changeType,
                messagesSent,
                failedDeliveries,
                processingTime,
                eventId: syncEvent.id
            });
            return {
                messagesSent,
                failedDeliveries,
                processingTime
            };
        }
        catch (error) {
            this.emit('broadcastError', { collection, changeType, error });
            throw error;
        }
    }
    /**
     * Conflict Resolution
     */
    async resolveConflict(conflictingEvents) {
        try {
            const resolution = await this.conflictResolver.resolve(conflictingEvents);
            this.emit('conflictResolved', {
                conflictingEventsCount: conflictingEvents.length,
                resolution: resolution.resolution,
                strategy: resolution.strategy
            });
            // Create resolved event
            const resolvedEvent = {
                ...conflictingEvents[0],
                id: `resolved_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`,
                data: resolution.resolvedValue,
                timestamp: resolution.timestamp
            };
            const discardedEvents = conflictingEvents.slice(1);
            return {
                resolution,
                resolvedEvent,
                discardedEvents
            };
        }
        catch (error) {
            this.emit('conflictResolutionError', { conflictingEvents, error });
            throw error;
        }
    }
    /**
     * Multi-Instance Synchronization
     */
    async synchronizeWithInstances(targetInstances) {
        const startTime = performance.now();
        const synchronizedInstances = [];
        const failedInstances = [];
        let syncedEvents = 0;
        try {
            // Get pending sync events
            const pendingEvents = this.syncEventQueue.filter(event => event.sourceInstance === this.instanceId);
            // Sync with each target instance
            for (const instanceId of targetInstances) {
                try {
                    const result = await this.replicationManager.syncWithInstance(instanceId, pendingEvents);
                    synchronizedInstances.push(instanceId);
                    syncedEvents += result.syncedEvents;
                }
                catch (error) {
                    failedInstances.push(instanceId);
                    this.emit('instanceSyncError', { instanceId, error });
                }
            }
            // Clear synced events from queue
            this.syncEventQueue = this.syncEventQueue.filter(event => event.sourceInstance !== this.instanceId);
            const totalTime = performance.now() - startTime;
            this.emit('multiInstanceSyncCompleted', {
                synchronizedInstances,
                failedInstances,
                syncedEvents,
                totalTime
            });
            return {
                synchronizedInstances,
                failedInstances,
                syncedEvents,
                totalTime
            };
        }
        catch (error) {
            this.emit('multiInstanceSyncError', { targetInstances, error });
            throw error;
        }
    }
    /**
     * Live Query Subscriptions
     */
    async createLiveQuery(clientId, collection, query, options = {}) {
        const queryId = `livequery_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
        // Create subscription for live query
        const subscription = await this.createLiveSubscription(clientId, collection, query, {
            initialData: true
        });
        // Store query-specific options
        const queryOptions = {
            ...options,
            subscriptionId: subscription.id,
            lastResult: null,
            debounceTimer: null
        };
        // Setup query result caching and debouncing
        this.setupLiveQueryProcessing(queryId, queryOptions);
        this.emit('liveQueryCreated', {
            queryId,
            clientId,
            collection,
            subscriptionId: subscription.id
        });
        return queryId;
    }
    // Private helper methods
    generateClientId(request) {
        const ip = request.socket.remoteAddress;
        const userAgent = request.headers['user-agent'];
        return `client_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
    }
    async handleClientMessage(clientId, message) {
        switch (message.type) {
            case 'subscribe':
                await this.createLiveSubscription(clientId, message.collection, message.query, message.options);
                break;
            case 'unsubscribe':
                await this.removeSubscription(message.subscriptionId);
                break;
            case 'ping':
                await this.sendToClient(clientId, { type: 'pong', timestamp: Date.now() });
                break;
            default:
                this.emit('unknownMessageType', { clientId, messageType: message.type });
        }
    }
    handleClientDisconnect(clientId) {
        // Remove client connection
        this.activeConnections.delete(clientId);
        // Remove client subscriptions
        const clientSubscriptions = Array.from(this.subscriptions.values())
            .filter(sub => sub.clientId === clientId);
        clientSubscriptions.forEach(sub => {
            this.subscriptions.delete(sub.id);
        });
        this.emit('clientDisconnected', {
            clientId,
            removedSubscriptions: clientSubscriptions.length
        });
    }
    async sendToClient(clientId, message) {
        const connection = this.activeConnections.get(clientId);
        if (connection && connection.readyState === WebSocket.OPEN) {
            connection.send(JSON.stringify(message));
        }
    }
    async sendInitialData(clientId, subscription) {
        // This would query the database and send initial data
        const initialData = { message: 'Initial data placeholder' };
        await this.sendToClient(clientId, {
            type: 'initialData',
            subscriptionId: subscription.id,
            data: initialData
        });
    }
    async processDataForClient(event, subscription) {
        let data = event.data;
        // Apply filters
        if (subscription.filters) {
            data = this.applyFilters(data, subscription.filters);
            if (data === null)
                return null;
        }
        // Apply transformations
        if (subscription.transformations) {
            data = this.applyTransformations(data, subscription.transformations);
        }
        return data;
    }
    applyFilters(data, filters) {
        // Apply filtering logic
        return data;
    }
    applyTransformations(data, transformations) {
        // Apply transformation logic
        return data;
    }
    generateChecksum(data) {
        // Generate data checksum for integrity verification
        return `checksum_${JSON.stringify(data).length}`;
    }
    setupSocketIOServer() {
        // Socket.IO server setup (placeholder)
    }
    setupServerSentEvents() {
        // SSE setup (placeholder)
    }
    setupHeartbeat() {
        setInterval(() => {
            this.activeConnections.forEach(async (connection, clientId) => {
                if (connection.readyState === WebSocket.OPEN) {
                    await this.sendToClient(clientId, {
                        type: 'heartbeat',
                        timestamp: Date.now()
                    });
                }
            });
        }, this.config.heartbeatInterval);
    }
    setupCleanup() {
        // Cleanup inactive subscriptions every 5 minutes
        setInterval(() => {
            const now = Date.now();
            const inactiveThreshold = 10 * 60 * 1000; // 10 minutes
            Array.from(this.subscriptions.entries()).forEach(([id, subscription]) => {
                if (now - subscription.lastActivity.getTime() > inactiveThreshold) {
                    this.subscriptions.delete(id);
                    this.emit('subscriptionCleaned', { subscriptionId: id, reason: 'inactive' });
                }
            });
        }, 5 * 60 * 1000);
    }
    setupPerformanceMonitoring() {
        setInterval(() => {
            this.performanceMetrics.set('timestamp', Date.now());
            this.performanceMetrics.set('activeConnections', this.activeConnections.size);
            this.performanceMetrics.set('activeSubscriptions', this.subscriptions.size);
            this.performanceMetrics.set('queuedEvents', this.syncEventQueue.length);
            this.emit('performanceMetrics', Object.fromEntries(this.performanceMetrics));
        }, 30000);
    }
    setupLiveQueryProcessing(queryId, options) {
        // Setup live query processing logic
    }
    async removeSubscription(subscriptionId) {
        this.subscriptions.delete(subscriptionId);
        this.emit('subscriptionRemoved', { subscriptionId });
    }
}
// Supporting classes
class ConflictResolver {
    strategy;
    constructor(strategy) {
        this.strategy = strategy;
    }
    async resolve(conflictingEvents) {
        // Conflict resolution logic based on strategy
        return {
            strategy: this.strategy,
            conflictedFields: [],
            resolution: 'accepted',
            resolvedValue: conflictingEvents[0].data,
            timestamp: Date.now()
        };
    }
}
class ReplicationManager {
    strategy;
    constructor(strategy) {
        this.strategy = strategy;
    }
    async replicateEvent(event) {
        // Event replication logic
    }
    async syncWithInstance(instanceId, events) {
        // Instance synchronization logic
        return { syncedEvents: events.length };
    }
}
export { RealtimeDataSynchronization };
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