@graphql-mesh/serve-cli/esm/commands/handleFork.js

import cluster from 'node:cluster';
import { registerTerminateHandler } from '@graphql-mesh/utils';
export function handleFork(log, config) {
    if (cluster.isPrimary && config.fork > 1) {
        const workers = new Set();
        let expectedToExit = false;
        log.debug(`Forking ${config.fork} workers`);
        for (let i = 0; i < config.fork; i++) {
            const worker = cluster.fork();
            worker.once('exit', (code, signal) => {
                if (expectedToExit) {
                    log.debug(`Worker ${worker.process.pid} exited with code ${code} and signal ${signal}`);
                }
                else {
                    log.warn(`Worker ${worker.process.pid} exited unexpectedly with code ${code} and signal ${signal}\n
A restart is recommended to ensure the stability of the service`);
                }
                workers.delete(worker);
                if (!expectedToExit && workers.size === 0) {
                    log.error(`All workers exited unexpectedly. Exiting`);
                    process.exit(1);
                }
            });
            workers.add(worker);
        }
        registerTerminateHandler(signal => {
            log.info(`Killing workers with ${signal}`);
            expectedToExit = true;
            workers.forEach(w => {
                w.kill(signal);
            });
        });
        return true;
    }
    return false;
}