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cluster.ts
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/**
* Cluster Mode Support
* Utilizes all CPU cores for maximum performance
*/
import cluster from 'cluster';
import os from 'os';
import { createLogger } from './common/logger.js';
const logger = createLogger({ service: 'ClusterManager' });
interface ClusterOptions {
workers?: number;
respawnDelay?: number;
maxRestarts?: number;
}
/**
* Start application in cluster mode
*/
export async function startCluster(
workerFile: string,
options: ClusterOptions = {}
) {
const {
workers = os.cpus().length,
respawnDelay = 1000,
maxRestarts = 5
} = options;
if (cluster.isPrimary) {
logger.info('Starting cluster mode', {
workers,
cpus: os.cpus().length,
platform: os.platform(),
memory: `${Math.round(os.totalmem() / 1024 / 1024 / 1024)}GB`
});
const workerRestarts = new Map<number, number>();
// Spawn workers
for (let i = 0; i < workers; i++) {
spawnWorker(i + 1);
}
// Handle worker exit
cluster.on('exit', (worker, code, signal) => {
const workerId = worker.id;
const restarts = workerRestarts.get(workerId) || 0;
logger.warn('Worker died', {
workerId,
pid: worker.process.pid,
code,
signal,
restarts
});
// Check if we should respawn
if (restarts < maxRestarts) {
workerRestarts.set(workerId, restarts + 1);
setTimeout(() => {
logger.info('Respawning worker', { workerId, attempt: restarts + 1 });
spawnWorker(workerId);
}, respawnDelay);
} else {
logger.error('Worker exceeded max restarts', undefined, { workerId, maxRestarts });
}
});
// Handle worker online
cluster.on('online', (worker) => {
logger.info('Worker online', {
workerId: worker.id,
pid: worker.process.pid
});
});
// Handle worker listening
cluster.on('listening', (worker, address) => {
logger.info('Worker listening', {
workerId: worker.id,
pid: worker.process.pid,
address: `${address.address}:${address.port}`
});
});
// Graceful shutdown
const shutdown = async () => {
logger.info('Shutting down cluster...');
const workers = Object.values(cluster.workers || {});
const shutdownPromises = workers.map((worker) => {
return new Promise<void>((resolve) => {
if (worker) {
worker.once('exit', () => {
logger.info('Worker shut down', { workerId: worker.id });
resolve();
});
worker.send('shutdown');
// Force kill after 10 seconds
setTimeout(() => {
if (!worker.isDead()) {
logger.warn('Force killing worker', { workerId: worker.id });
worker.kill('SIGKILL');
}
resolve();
}, 10000);
} else {
resolve();
}
});
});
await Promise.all(shutdownPromises);
logger.info('All workers shut down');
process.exit(0);
};
process.on('SIGTERM', shutdown);
process.on('SIGINT', shutdown);
// Performance monitoring
setInterval(() => {
const workers = Object.values(cluster.workers || {});
const activeWorkers = workers.filter(w => w && !w.isDead()).length;
logger.debug('Cluster health check', {
totalWorkers: workers.length,
activeWorkers,
memory: process.memoryUsage(),
uptime: process.uptime()
});
}, 60000); // Every minute
} else {
// Worker process - import and run the application
try {
await import(workerFile);
// Handle shutdown signal from master
process.on('message', (msg) => {
if (msg === 'shutdown') {
logger.info('Worker received shutdown signal', {
workerId: cluster.worker?.id
});
// Gracefully close connections
process.exit(0);
}
});
} catch (error) {
logger.error('Worker failed to start', error as Error, {
stack: (error as Error).stack
});
process.exit(1);
}
}
}
/**
* Spawn a new worker
*/
function spawnWorker(workerId: number) {
const worker = cluster.fork();
worker.id = workerId;
return worker;
}
/**
* Check if running in cluster mode
*/
export function isClusterMode(): boolean {
return cluster.isWorker;
}
/**
* Get worker ID (0 if not in cluster mode)
*/
export function getWorkerId(): number {
return cluster.worker?.id || 0;
}
/**
* Get total number of workers
*/
export function getTotalWorkers(): number {
if (cluster.isPrimary) {
return Object.keys(cluster.workers || {}).length;
}
return 0;
}