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* PubSubManager - Automatic Event Publishing and Subscription
*
* This class handles automatic publishing of model changes and database events
* to IPFS PubSub topics, enabling real-time synchronization across nodes:
* - Model-level events (create, update, delete)
* - Database-level events (replication, sync)
* - Custom application events
* - Topic management and subscription handling
* - Event filtering and routing
*/
import { BaseModel } from '../models/BaseModel';
// Node.js types for compatibility
declare global {
namespace NodeJS {
interface Timeout {}
}
}
export interface PubSubConfig {
enabled: boolean;
autoPublishModelEvents: boolean;
autoPublishDatabaseEvents: boolean;
topicPrefix: string;
maxRetries: number;
retryDelay: number;
eventBuffer: {
enabled: boolean;
maxSize: number;
flushInterval: number;
};
compression: {
enabled: boolean;
threshold: number; // bytes
};
encryption: {
enabled: boolean;
publicKey?: string;
privateKey?: string;
};
}
export interface PubSubEvent {
id: string;
type: string;
topic: string;
data: any;
timestamp: number;
source: string;
metadata?: any;
}
export interface TopicSubscription {
topic: string;
handler: (event: PubSubEvent) => void | Promise<void>;
filter?: (event: PubSubEvent) => boolean;
options: {
autoAck: boolean;
maxRetries: number;
deadLetterTopic?: string;
};
}
export interface PubSubStats {
totalPublished: number;
totalReceived: number;
totalSubscriptions: number;
publishErrors: number;
receiveErrors: number;
averageLatency: number;
topicStats: Map<
string,
{
published: number;
received: number;
subscribers: number;
lastActivity: number;
}
>;
}
export class PubSubManager {
private ipfsService: any;
private config: PubSubConfig;
private subscriptions: Map<string, TopicSubscription[]> = new Map();
private eventBuffer: PubSubEvent[] = [];
private bufferFlushInterval: any = null;
private stats: PubSubStats;
private latencyMeasurements: number[] = [];
private nodeId: string;
private isInitialized: boolean = false;
private eventListeners: Map<string, Function[]> = new Map();
constructor(ipfsService: any, config: Partial<PubSubConfig> = {}) {
this.ipfsService = ipfsService;
this.nodeId = `node-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
this.config = {
enabled: true,
autoPublishModelEvents: true,
autoPublishDatabaseEvents: true,
topicPrefix: 'debros',
maxRetries: 3,
retryDelay: 1000,
eventBuffer: {
enabled: true,
maxSize: 100,
flushInterval: 5000,
},
compression: {
enabled: true,
threshold: 1024,
},
encryption: {
enabled: false,
},
...config,
};
this.stats = {
totalPublished: 0,
totalReceived: 0,
totalSubscriptions: 0,
publishErrors: 0,
receiveErrors: 0,
averageLatency: 0,
topicStats: new Map(),
};
}
// Simple event emitter functionality
emit(event: string, ...args: any[]): boolean {
const listeners = this.eventListeners.get(event) || [];
listeners.forEach((listener) => {
try {
listener(...args);
} catch (error) {
console.error(`Error in event listener for ${event}:`, error);
}
});
return listeners.length > 0;
}
on(event: string, listener: Function): this {
if (!this.eventListeners.has(event)) {
this.eventListeners.set(event, []);
}
this.eventListeners.get(event)!.push(listener);
return this;
}
off(event: string, listener?: Function): this {
if (!listener) {
this.eventListeners.delete(event);
} else {
const listeners = this.eventListeners.get(event) || [];
const index = listeners.indexOf(listener);
if (index >= 0) {
listeners.splice(index, 1);
}
}
return this;
}
// Initialize PubSub system
async initialize(): Promise<void> {
if (!this.config.enabled) {
console.log('📡 PubSub disabled in configuration');
return;
}
try {
console.log('📡 Initializing PubSubManager...');
// Start event buffer flushing if enabled
if (this.config.eventBuffer.enabled) {
this.startEventBuffering();
}
// Subscribe to model events if auto-publishing is enabled
if (this.config.autoPublishModelEvents) {
this.setupModelEventPublishing();
}
// Subscribe to database events if auto-publishing is enabled
if (this.config.autoPublishDatabaseEvents) {
this.setupDatabaseEventPublishing();
}
this.isInitialized = true;
console.log('✅ PubSubManager initialized successfully');
} catch (error) {
console.error('❌ Failed to initialize PubSubManager:', error);
throw error;
}
}
// Publish event to a topic
async publish(
topic: string,
data: any,
options: {
priority?: 'low' | 'normal' | 'high';
retries?: number;
compress?: boolean;
encrypt?: boolean;
metadata?: any;
} = {},
): Promise<boolean> {
if (!this.config.enabled || !this.isInitialized) {
return false;
}
const event: PubSubEvent = {
id: this.generateEventId(),
type: this.extractEventType(topic),
topic: this.prefixTopic(topic),
data,
timestamp: Date.now(),
source: this.nodeId,
metadata: options.metadata,
};
try {
// Process event (compression, encryption, etc.)
const processedData = await this.processEventForPublishing(event, options);
// Publish with buffering or directly
if (this.config.eventBuffer.enabled && options.priority !== 'high') {
return this.bufferEvent(event, processedData);
} else {
return await this.publishDirect(event.topic, processedData, options.retries);
}
} catch (error) {
this.stats.publishErrors++;
console.error(`❌ Failed to publish to ${topic}:`, error);
this.emit('publishError', { topic, error, event });
return false;
}
}
// Subscribe to a topic
async subscribe(
topic: string,
handler: (event: PubSubEvent) => void | Promise<void>,
options: {
filter?: (event: PubSubEvent) => boolean;
autoAck?: boolean;
maxRetries?: number;
deadLetterTopic?: string;
} = {},
): Promise<boolean> {
if (!this.config.enabled || !this.isInitialized) {
return false;
}
const fullTopic = this.prefixTopic(topic);
try {
const subscription: TopicSubscription = {
topic: fullTopic,
handler,
filter: options.filter,
options: {
autoAck: options.autoAck !== false,
maxRetries: options.maxRetries || this.config.maxRetries,
deadLetterTopic: options.deadLetterTopic,
},
};
// Add to subscriptions map
if (!this.subscriptions.has(fullTopic)) {
this.subscriptions.set(fullTopic, []);
// Subscribe to IPFS PubSub topic
await this.ipfsService.pubsub.subscribe(fullTopic, (message: any) => {
this.handleIncomingMessage(fullTopic, message);
});
}
this.subscriptions.get(fullTopic)!.push(subscription);
this.stats.totalSubscriptions++;
// Update topic stats
this.updateTopicStats(fullTopic, 'subscribers', 1);
console.log(`📡 Subscribed to topic: ${fullTopic}`);
this.emit('subscribed', { topic: fullTopic, subscription });
return true;
} catch (error) {
console.error(`❌ Failed to subscribe to ${topic}:`, error);
this.emit('subscribeError', { topic, error });
return false;
}
}
// Unsubscribe from a topic
async unsubscribe(topic: string, handler?: Function): Promise<boolean> {
const fullTopic = this.prefixTopic(topic);
const subscriptions = this.subscriptions.get(fullTopic);
if (!subscriptions) {
return false;
}
try {
if (handler) {
// Remove specific handler
const index = subscriptions.findIndex((sub) => sub.handler === handler);
if (index >= 0) {
subscriptions.splice(index, 1);
this.stats.totalSubscriptions--;
}
} else {
// Remove all handlers for this topic
this.stats.totalSubscriptions -= subscriptions.length;
subscriptions.length = 0;
}
// If no more subscriptions, unsubscribe from IPFS
if (subscriptions.length === 0) {
await this.ipfsService.pubsub.unsubscribe(fullTopic);
this.subscriptions.delete(fullTopic);
this.stats.topicStats.delete(fullTopic);
}
console.log(`📡 Unsubscribed from topic: ${fullTopic}`);
this.emit('unsubscribed', { topic: fullTopic });
return true;
} catch (error) {
console.error(`❌ Failed to unsubscribe from ${topic}:`, error);
return false;
}
}
// Setup automatic model event publishing
private setupModelEventPublishing(): void {
const topics = {
create: 'model.created',
update: 'model.updated',
delete: 'model.deleted',
save: 'model.saved',
};
// Listen for model events on the global framework instance
this.on('modelEvent', async (eventType: string, model: BaseModel, changes?: any) => {
const topic = topics[eventType as keyof typeof topics];
if (!topic) return;
const eventData = {
modelName: model.constructor.name,
modelId: model.id,
userId: (model as any).userId,
changes,
timestamp: Date.now(),
};
await this.publish(topic, eventData, {
priority: eventType === 'delete' ? 'high' : 'normal',
metadata: {
modelType: model.constructor.name,
scope: (model.constructor as any).scope,
},
});
});
}
// Setup automatic database event publishing
private setupDatabaseEventPublishing(): void {
const databaseTopics = {
replication: 'database.replicated',
sync: 'database.synced',
conflict: 'database.conflict',
error: 'database.error',
};
// Listen for database events
this.on('databaseEvent', async (eventType: string, data: any) => {
const topic = databaseTopics[eventType as keyof typeof databaseTopics];
if (!topic) return;
await this.publish(topic, data, {
priority: eventType === 'error' ? 'high' : 'normal',
metadata: {
eventType,
source: 'database',
},
});
});
}
// Handle incoming PubSub messages
private async handleIncomingMessage(topic: string, message: any): Promise<void> {
try {
const startTime = Date.now();
// Parse and validate message
const event = await this.processIncomingMessage(message);
if (!event) return;
// Update stats
this.stats.totalReceived++;
this.updateTopicStats(topic, 'received', 1);
// Calculate latency
const latency = Date.now() - event.timestamp;
this.latencyMeasurements.push(latency);
if (this.latencyMeasurements.length > 100) {
this.latencyMeasurements.shift();
}
this.stats.averageLatency =
this.latencyMeasurements.reduce((a, b) => a + b, 0) / this.latencyMeasurements.length;
// Route to subscribers
const subscriptions = this.subscriptions.get(topic) || [];
for (const subscription of subscriptions) {
try {
// Apply filter if present
if (subscription.filter && !subscription.filter(event)) {
continue;
}
// Call handler
await this.callHandlerWithRetry(subscription, event);
} catch (error: any) {
this.stats.receiveErrors++;
console.error(`❌ Handler error for ${topic}:`, error);
// Send to dead letter topic if configured
if (subscription.options.deadLetterTopic) {
await this.publish(subscription.options.deadLetterTopic, {
originalTopic: topic,
originalEvent: event,
error: error?.message || String(error),
timestamp: Date.now(),
});
}
}
}
this.emit('messageReceived', { topic, event, processingTime: Date.now() - startTime });
} catch (error) {
this.stats.receiveErrors++;
console.error(`❌ Failed to handle message from ${topic}:`, error);
this.emit('messageError', { topic, error });
}
}
// Call handler with retry logic
private async callHandlerWithRetry(
subscription: TopicSubscription,
event: PubSubEvent,
attempt: number = 1,
): Promise<void> {
try {
await subscription.handler(event);
} catch (error) {
if (attempt < subscription.options.maxRetries) {
console.warn(
`🔄 Retrying handler (attempt ${attempt + 1}/${subscription.options.maxRetries})`,
);
await new Promise((resolve) => setTimeout(resolve, this.config.retryDelay * attempt));
return this.callHandlerWithRetry(subscription, event, attempt + 1);
}
throw error;
}
}
// Process event for publishing (compression, encryption, etc.)
private async processEventForPublishing(event: PubSubEvent, options: any): Promise<string> {
let data = JSON.stringify(event);
// Compression
if (
options.compress !== false &&
this.config.compression.enabled &&
data.length > this.config.compression.threshold
) {
// In a real implementation, you'd use a compression library like zlib
// data = await compress(data);
}
// Encryption
if (
options.encrypt !== false &&
this.config.encryption.enabled &&
this.config.encryption.publicKey
) {
// In a real implementation, you'd encrypt with the public key
// data = await encrypt(data, this.config.encryption.publicKey);
}
return data;
}
// Process incoming message
private async processIncomingMessage(message: any): Promise<PubSubEvent | null> {
try {
let data = message.data.toString();
// Decryption
if (this.config.encryption.enabled && this.config.encryption.privateKey) {
// In a real implementation, you'd decrypt with the private key
// data = await decrypt(data, this.config.encryption.privateKey);
}
// Decompression
if (this.config.compression.enabled) {
// In a real implementation, you'd detect and decompress
// data = await decompress(data);
}
const event = JSON.parse(data) as PubSubEvent;
// Validate event structure
if (!event.id || !event.topic || !event.timestamp) {
console.warn('❌ Invalid event structure received');
return null;
}
// Ignore our own messages
if (event.source === this.nodeId) {
return null;
}
return event;
} catch (error) {
console.error('❌ Failed to process incoming message:', error);
return null;
}
}
// Direct publish without buffering
private async publishDirect(
topic: string,
data: string,
retries: number = this.config.maxRetries,
): Promise<boolean> {
for (let attempt = 1; attempt <= retries; attempt++) {
try {
await this.ipfsService.pubsub.publish(topic, data);
this.stats.totalPublished++;
this.updateTopicStats(topic, 'published', 1);
return true;
} catch (error) {
if (attempt === retries) {
throw error;
}
console.warn(`🔄 Retrying publish (attempt ${attempt + 1}/${retries})`);
await new Promise((resolve) => setTimeout(resolve, this.config.retryDelay * attempt));
}
}
return false;
}
// Buffer event for batch publishing
private bufferEvent(event: PubSubEvent, _data: string): boolean {
if (this.eventBuffer.length >= this.config.eventBuffer.maxSize) {
// Buffer is full, flush immediately
this.flushEventBuffer();
}
this.eventBuffer.push(event);
return true;
}
// Start event buffering
private startEventBuffering(): void {
this.bufferFlushInterval = setInterval(() => {
this.flushEventBuffer();
}, this.config.eventBuffer.flushInterval);
}
// Flush event buffer
private async flushEventBuffer(): Promise<void> {
if (this.eventBuffer.length === 0) return;
const events = [...this.eventBuffer];
this.eventBuffer.length = 0;
console.log(`📡 Flushing ${events.length} buffered events`);
// Group events by topic for efficiency
const eventsByTopic = new Map<string, PubSubEvent[]>();
for (const event of events) {
if (!eventsByTopic.has(event.topic)) {
eventsByTopic.set(event.topic, []);
}
eventsByTopic.get(event.topic)!.push(event);
}
// Publish batches
for (const [topic, topicEvents] of eventsByTopic) {
try {
for (const event of topicEvents) {
const data = await this.processEventForPublishing(event, {});
await this.publishDirect(topic, data);
}
} catch (error) {
console.error(`❌ Failed to flush events for ${topic}:`, error);
this.stats.publishErrors += topicEvents.length;
}
}
}
// Update topic statistics
private updateTopicStats(
topic: string,
metric: 'published' | 'received' | 'subscribers',
delta: number,
): void {
if (!this.stats.topicStats.has(topic)) {
this.stats.topicStats.set(topic, {
published: 0,
received: 0,
subscribers: 0,
lastActivity: Date.now(),
});
}
const stats = this.stats.topicStats.get(topic)!;
stats[metric] += delta;
stats.lastActivity = Date.now();
}
// Utility methods
private generateEventId(): string {
return `${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
}
private extractEventType(topic: string): string {
const parts = topic.split('.');
return parts[parts.length - 1];
}
private prefixTopic(topic: string): string {
return `${this.config.topicPrefix}.${topic}`;
}
// Get PubSub statistics
getStats(): PubSubStats {
return { ...this.stats };
}
// Get list of active topics
getActiveTopics(): string[] {
return Array.from(this.subscriptions.keys());
}
// Get subscribers for a topic
getTopicSubscribers(topic: string): number {
const fullTopic = this.prefixTopic(topic);
return this.subscriptions.get(fullTopic)?.length || 0;
}
// Check if topic exists
hasSubscriptions(topic: string): boolean {
const fullTopic = this.prefixTopic(topic);
return this.subscriptions.has(fullTopic) && this.subscriptions.get(fullTopic)!.length > 0;
}
// Clear all subscriptions
async clearAllSubscriptions(): Promise<void> {
const topics = Array.from(this.subscriptions.keys());
for (const topic of topics) {
try {
await this.ipfsService.pubsub.unsubscribe(topic);
} catch (error) {
console.error(`Failed to unsubscribe from ${topic}:`, error);
}
}
this.subscriptions.clear();
this.stats.topicStats.clear();
this.stats.totalSubscriptions = 0;
console.log(`📡 Cleared all ${topics.length} subscriptions`);
}
// Shutdown
async shutdown(): Promise<void> {
console.log('📡 Shutting down PubSubManager...');
// Stop event buffering
if (this.bufferFlushInterval) {
clearInterval(this.bufferFlushInterval as any);
this.bufferFlushInterval = null;
}
// Flush remaining events
await this.flushEventBuffer();
// Clear all subscriptions
await this.clearAllSubscriptions();
// Clear event listeners
this.eventListeners.clear();
this.isInitialized = false;
console.log('✅ PubSubManager shut down successfully');
}
}
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