DAEMON PROCESS

daemon-process.ts

PID management, Unix socket API, job scheduler, signal handling, per-project configuration.

Stark

WHAT THIS PATTERN TEACHES

How to build a long-running daemon with PID file management, Unix socket control API, cron-like job scheduling, graceful signal handling, and per-project path configuration with dual-daemon guard (v22.0).

WHEN TO USE THIS

Background services: heartbeat monitors, spend watchers, portfolio pollers, token refreshers.

AT A GLANCE

class Daemon {
  async start() {
    this.writePid();
    this.startSocket();
    this.scheduleJobs();
    process.on("SIGTERM", () => this.shutdown());
  }
}

FRAMEWORK IMPLEMENTATIONS

TypeScript

import fs from "fs";
import net from "net";

class Daemon {
  private pidFile: string;
  private socketPath: string;

  async start() {
    if (this.isRunning()) throw new Error("Already running");
    this.writePid();
    this.startSocket();
    process.on("SIGTERM", () => this.shutdown());
    process.on("SIGINT", () => this.shutdown());
  }

  private writePid() {
    fs.writeFileSync(this.pidFile, String(process.pid));
  }

  private startSocket() {

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