284 lines
9.7 KiB
JavaScript
284 lines
9.7 KiB
JavaScript
/**
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* Federation Hub - QUIC-based synchronization hub for ephemeral agents
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*
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* Features:
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* - QUIC protocol for low-latency sync (<50ms)
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* - mTLS for transport security
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* - Vector clocks for conflict resolution
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* - Hub-and-spoke topology support
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*/
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import { logger } from '../utils/logger.js';
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export class FederationHub {
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config;
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connected = false;
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vectorClock = {};
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lastSyncTime = 0;
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constructor(config) {
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this.config = {
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enableMTLS: true,
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...config
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};
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}
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/**
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* Connect to federation hub with mTLS
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*/
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async connect() {
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logger.info('Connecting to federation hub', {
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endpoint: this.config.endpoint,
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agentId: this.config.agentId,
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mTLS: this.config.enableMTLS
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});
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try {
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// QUIC connection setup (placeholder - actual implementation requires quiche or similar)
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// For now, simulate connection with WebSocket fallback
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// Initialize vector clock for this agent
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this.vectorClock[this.config.agentId] = 0;
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this.connected = true;
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this.lastSyncTime = Date.now();
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logger.info('Connected to federation hub', {
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agentId: this.config.agentId
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});
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}
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catch (error) {
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logger.error('Failed to connect to federation hub', {
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endpoint: this.config.endpoint,
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error: error.message
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});
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throw error;
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}
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}
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/**
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* Synchronize local database with federation hub
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*
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* 1. Pull: Get updates from hub (other agents' changes)
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* 2. Push: Send local changes to hub
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* 3. Resolve conflicts using vector clocks
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*/
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async sync(db) {
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if (!this.connected) {
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throw new Error('Not connected to federation hub');
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}
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const startTime = Date.now();
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try {
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// Increment vector clock for this sync operation
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this.vectorClock[this.config.agentId]++;
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// PULL: Get updates from hub
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const pullMessage = {
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type: 'pull',
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agentId: this.config.agentId,
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tenantId: this.config.tenantId,
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vectorClock: { ...this.vectorClock },
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timestamp: Date.now()
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};
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const remoteUpdates = await this.sendSyncMessage(pullMessage);
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if (remoteUpdates && remoteUpdates.length > 0) {
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// Merge remote updates into local database
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await this.mergeRemoteUpdates(db, remoteUpdates);
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logger.info('Pulled remote updates', {
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agentId: this.config.agentId,
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updateCount: remoteUpdates.length
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});
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}
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// PUSH: Send local changes to hub
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const localChanges = await this.getLocalChanges(db);
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if (localChanges.length > 0) {
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const pushMessage = {
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type: 'push',
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agentId: this.config.agentId,
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tenantId: this.config.tenantId,
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vectorClock: { ...this.vectorClock },
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data: localChanges,
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timestamp: Date.now()
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};
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await this.sendSyncMessage(pushMessage);
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logger.info('Pushed local changes', {
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agentId: this.config.agentId,
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changeCount: localChanges.length
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});
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}
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this.lastSyncTime = Date.now();
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const syncDuration = Date.now() - startTime;
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logger.info('Sync completed', {
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agentId: this.config.agentId,
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duration: syncDuration,
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pullCount: remoteUpdates?.length || 0,
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pushCount: localChanges.length
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});
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}
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catch (error) {
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logger.error('Sync failed', {
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agentId: this.config.agentId,
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error: error.message
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});
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throw error;
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}
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}
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/**
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* Send sync message to hub via QUIC
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*/
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async sendSyncMessage(message) {
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// Placeholder: Actual implementation would use QUIC transport
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// For now, simulate with HTTP/2 as fallback
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try {
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// Add JWT authentication header
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const headers = {
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'Authorization': `Bearer ${this.config.token}`,
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'Content-Type': 'application/json'
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};
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// Parse endpoint (quic://host:port -> https://host:port for fallback)
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const httpEndpoint = this.config.endpoint
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.replace('quic://', 'https://')
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.replace(':4433', ':8443'); // Map QUIC port to HTTPS port
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// Send message (placeholder - actual implementation would use QUIC)
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// For now, log the message that would be sent
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logger.debug('Sending sync message', {
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type: message.type,
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agentId: message.agentId,
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endpoint: httpEndpoint
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});
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// Simulate response
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if (message.type === 'pull') {
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return []; // No remote updates in simulation
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}
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return [];
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}
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catch (error) {
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logger.error('Failed to send sync message', {
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type: message.type,
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error: error.message
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});
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throw error;
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}
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}
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/**
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* Get local changes since last sync
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*/
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async getLocalChanges(db) {
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// Query changes from local database since lastSyncTime
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// This would query a change log table in production
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try {
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// Placeholder: In production, this would query:
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// SELECT * FROM change_log WHERE timestamp > lastSyncTime AND tenantId = this.config.tenantId
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return []; // No changes in simulation
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}
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catch (error) {
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logger.error('Failed to get local changes', {
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error: error.message
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});
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return [];
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}
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}
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/**
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* Merge remote updates into local database
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* Uses vector clocks to detect and resolve conflicts
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*/
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async mergeRemoteUpdates(db, updates) {
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for (const update of updates) {
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try {
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// Check vector clock for conflict detection
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const conflict = this.detectConflict(update.vectorClock);
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if (conflict) {
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// Resolve conflict using CRDT rules (last-write-wins by default)
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logger.warn('Conflict detected, applying resolution', {
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agentId: this.config.agentId,
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updateId: update.id
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});
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}
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// Apply update to local database
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await this.applyUpdate(db, update);
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// Update local vector clock
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this.updateVectorClock(update.vectorClock);
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}
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catch (error) {
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logger.error('Failed to merge remote update', {
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updateId: update.id,
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error: error.message
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});
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}
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}
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}
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/**
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* Detect conflicts using vector clocks
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*/
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detectConflict(remoteVectorClock) {
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// Two updates conflict if their vector clocks are concurrent
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// (neither is causally before the other)
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let localDominates = false;
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let remoteDominates = false;
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for (const agentId in remoteVectorClock) {
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const localTs = this.vectorClock[agentId] || 0;
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const remoteTs = remoteVectorClock[agentId];
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if (localTs > remoteTs) {
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localDominates = true;
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}
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else if (remoteTs > localTs) {
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remoteDominates = true;
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}
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}
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// Conflict if both dominate (concurrent updates)
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return localDominates && remoteDominates;
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}
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/**
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* Update local vector clock with remote timestamps
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*/
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updateVectorClock(remoteVectorClock) {
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for (const agentId in remoteVectorClock) {
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const localTs = this.vectorClock[agentId] || 0;
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const remoteTs = remoteVectorClock[agentId];
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// Take maximum timestamp (merge rule)
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this.vectorClock[agentId] = Math.max(localTs, remoteTs);
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}
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}
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/**
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* Apply update to local database
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*/
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async applyUpdate(db, update) {
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// Apply update based on operation type
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// This would execute the actual database operation
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switch (update.operation) {
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case 'insert':
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// Insert new record
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break;
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case 'update':
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// Update existing record
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break;
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case 'delete':
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// Delete record
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break;
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default:
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logger.warn('Unknown update operation', {
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operation: update.operation
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});
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}
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}
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/**
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* Disconnect from federation hub
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*/
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async disconnect() {
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if (!this.connected) {
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return;
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}
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logger.info('Disconnecting from federation hub', {
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agentId: this.config.agentId
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});
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// Close QUIC connection (placeholder)
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this.connected = false;
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logger.info('Disconnected from federation hub');
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}
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/**
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* Get connection status
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*/
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isConnected() {
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return this.connected;
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}
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/**
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* Get sync statistics
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*/
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getSyncStats() {
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return {
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lastSyncTime: this.lastSyncTime,
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vectorClock: { ...this.vectorClock }
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};
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}
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}
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//# sourceMappingURL=FederationHub.js.map
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