feat: PortManager — intelligent port lifecycle with retry+backoff
Replace 158 lines of fragile inline port logic (probePort, bindPort, killStaleProcess, waitForPort, readStalePid) with a proper module: - State machine: idle → probing → claiming → owned → releasing - Triple holder detection: pidfile → ss → lsof fallback - Age-based kill strategy (young siblings get waited on, not killed) - Exponential backoff retry (5 attempts) instead of instant process.exit - EventEmitter for stateChange/claimed/retry/failed events - getStatus() for diagnostics - Exposed in bot return object for external health checks All previous features preserved, zero downgrades.
This commit is contained in:
Kilo
172
src/bot/index.js
172
src/bot/index.js
@@ -7,7 +7,6 @@ import { WebSocketServer } from 'ws';
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import fs from 'fs';
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import path from 'path';
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import { execSync } from 'child_process';
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import net from 'net';
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import { logger } from '../utils/logger.js';
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import { checkEnv } from '../utils/env.js';
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import { getRTK } from '../utils/rtk.js';
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@@ -31,20 +30,10 @@ import { Agent } from '../agents/Agent.js';
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import { Task } from '../agents/Task.js';
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import { SwarmCoordinator } from '../agents/SwarmCoordinator.js';
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import { JSONBackend, InMemoryBackend, MEMORY_TYPES } from './memory-backend.js';
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import { PortManager } from './port-manager.js';
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// ── Pidfile: informational only, no process killing ──
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const PIDFILE = path.join(process.env.HOME || '/tmp', '.zcode-bot.pid');
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function acquirePidfile() {
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try {
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fs.writeFileSync(PIDFILE, process.pid.toString());
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logger.info(`✓ Pidfile: ${PIDFILE} (PID ${process.pid})`);
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} catch (e) {
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logger.warn(`Pidfile write failed: ${e.message}`);
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}
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}
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function releasePidfile() {
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try { fs.unlinkSync(PIDFILE); } catch {}
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}
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// ── PortManager handles pidfile + port lifecycle (see port-manager.js) ──
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function buildSessionKey(chatId, threadId) {
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return threadId ? `${chatId}:${threadId}` : String(chatId);
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@@ -1430,9 +1419,15 @@ export async function initBot(config, api, tools, skills, agents) {
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// ── (unhandled rejection handler registered below with gracefulShutdown) ──
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// ── Graceful shutdown is defined at end of initBot (requires full `svc`) ──
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acquirePidfile();
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// ── PortManager: smart port lifecycle (claim, retry, recover) ──
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const PIDFILE = path.join(process.env.HOME || '/tmp', '.zcode-bot.pid');
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const portManager = new PortManager({
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port: PORT,
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pidfile: PIDFILE,
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maxAttempts: 5,
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baseDelayMs: 500,
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maxDelayMs: 5000,
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});
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// ── Express + WebSocket server (keep for webhook compatibility) ──
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const app = express();
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@@ -1487,148 +1482,16 @@ export async function initBot(config, api, tools, skills, agents) {
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const PORT = process.env.ZCODE_PORT || 3000;
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// ── Robust port binding: pidfile-based stale detection, no fuser ──
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// Strategy (inspired by Next.js, Vite, webpack-dev-server):
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// 1. Read pidfile for stale process, SIGTERM it if still alive
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// 2. Probe port with a disposable net socket to confirm availability
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// 3. Bind httpServer after port is confirmed free
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// This avoids the fuser race condition where fuser returns the current
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// process PID because the socket is already half-open.
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function readStalePid() {
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// ── Claim port via PortManager (retry + stale recovery + backoff) ──
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try {
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const pid = parseInt(fs.readFileSync(PIDFILE, 'utf8').trim(), 10);
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if (!isNaN(pid) && pid !== process.pid) return pid;
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} catch {}
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return null;
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}
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function isProcessAlive(pid) {
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try { process.kill(pid, 0); return true; } catch { return false; }
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}
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function killStaleProcess(pid) {
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if (!isProcessAlive(pid)) return false;
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// Guard: don't kill processes younger than 15 seconds (prevents crash-loop
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// where systemd restarts before old instance finishes dying, causing mutual kills)
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try {
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const stat = fs.readFileSync(`/proc/${pid}/stat`, 'utf8');
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// Field 22 in /proc/pid/stat is starttime (in jiffies since boot)
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const fields = stat.split(')');
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if (fields.length > 1) {
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const statFields = fields[1].trim().split(/\s+/);
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const startTimeTicks = parseInt(statFields[19], 10);
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if (!isNaN(startTimeTicks)) {
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const bootTime = fs.readFileSync('/proc/stat', 'utf8')
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.split('\n').find(l => l.startsWith('btime '))?.split(/\s+/)[1];
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if (bootTime) {
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const startTimeMs = (parseInt(bootTime) + startTimeTicks / 100) * 1000;
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const age = Date.now() - startTimeMs;
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if (age < 15000) {
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logger.warn(` Skipping PID ${pid} — only ${Math.round(age / 1000)}s old (crash-loop guard)`);
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return false;
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}
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}
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}
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}
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} catch {
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// /proc not available (non-Linux) — skip guard
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}
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try {
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process.kill(pid, 'SIGTERM');
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logger.warn(` Sent SIGTERM to stale PID ${pid}`);
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return true;
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} catch (e) {
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logger.warn(` Failed to kill stale PID ${pid}: ${e.message}`);
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return false;
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}
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}
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function probePort(port) {
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return new Promise((resolve) => {
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const sock = net.createServer();
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sock.listen(port, () => {
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sock.close(() => resolve(false)); // port is free
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});
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sock.on('error', () => resolve(true)); // port is in use
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});
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}
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async function waitForPort(port, maxMs = 5000) {
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const start = Date.now();
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while (Date.now() - start < maxMs) {
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const inUse = await probePort(port);
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if (!inUse) return true;
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await new Promise(r => setTimeout(r, 300));
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}
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return false;
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}
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async function bindPort() {
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// Ensure pidfile is current before port probe
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acquirePidfile();
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const inUse = await probePort(PORT);
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if (inUse) {
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logger.warn(`⚠ Port ${PORT} in use — checking for stale process`);
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const stalePid = readStalePid();
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if (stalePid) {
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const killed = killStaleProcess(stalePid);
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if (killed) {
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const freed = await waitForPort(PORT);
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if (!freed) {
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logger.error(`❌ Port ${PORT} still occupied after killing stale PID ${stalePid}`);
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process.exit(1);
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}
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logger.info(`✓ Port ${PORT} freed after stale process cleanup`);
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}
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} else {
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// No stale pidfile — try to find the process via ss
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try {
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const ssOut = execSync(`ss -tlnp 'sport = :${PORT}' 2>/dev/null`, { encoding: 'utf8' }).trim();
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const pidMatch = ssOut.match(/pid=(\d+)/);
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if (pidMatch) {
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const stalePid = parseInt(pidMatch[1]);
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if (!isNaN(stalePid) && stalePid !== process.pid) {
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const killed = killStaleProcess(stalePid);
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if (killed) {
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const freed = await waitForPort(PORT);
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if (freed) {
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logger.info(`✓ Port ${PORT} freed after killing PID ${stalePid} (detected via ss)`);
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} else {
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logger.error(`❌ Port ${PORT} still occupied after killing PID ${stalePid}`);
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process.exit(1);
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}
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}
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}
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} else {
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logger.error(`❌ Port ${PORT} occupied by unknown process (no pidfile, ss couldn't identify). Free it manually or change ZCODE_PORT.`);
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process.exit(1);
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}
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} catch {
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logger.error(`❌ Port ${PORT} occupied by unknown process. Free it manually or change ZCODE_PORT.`);
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process.exit(1);
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}
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}
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}
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// Bind the server
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await new Promise((resolve, reject) => {
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httpServer.listen(PORT, () => {
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await portManager.claim(httpServer);
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logger.info(`✓ HTTP on :${PORT} · WS ready · grammy bot online`);
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logger.info(`✓ ${svc.tools.length} tools · ${svc.skills.length} skills · ${svc.agents.length} agents`);
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resolve();
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});
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httpServer.once('error', (err) => {
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reject(err);
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});
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}).catch((err) => {
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logger.error(`❌ Failed to bind port ${PORT}: ${err.message}`);
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} catch (err) {
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logger.error(`❌ Port ${PORT} unavailable after retries: ${err.message}`);
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process.exit(1);
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});
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}
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await bindPort();
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@@ -1672,7 +1535,7 @@ export async function initBot(config, api, tools, skills, agents) {
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try { await bot.stop(); } catch {}
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// Close HTTP server
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try { await new Promise(r => httpServer.close(r)); } catch {}
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releasePidfile();
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portManager.release();
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logger.info('✓ Shutdown complete');
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process.exit(0);
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};
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@@ -1715,6 +1578,7 @@ export async function initBot(config, api, tools, skills, agents) {
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hookManager: svc.hooks,
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memBackend: svc.memBackend,
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agentOrchestrator: svc.agentOrchestrator,
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portManager,
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getState: () => ({ tools: svc.tools.length, skills: svc.skills.length, agents: svc.agents.length, plugins: svc.pluginManager?.getPlugins()?.length || 0, wsClients: wsClients.size }),
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};
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}
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327
src/bot/port-manager.js
Normal file
327
src/bot/port-manager.js
Normal file
@@ -0,0 +1,327 @@
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/**
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* PortManager — intelligent port lifecycle manager
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*
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* Replaces the fragile probe→kill→exit dance with a proper state machine:
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* 1. Probe if port is in use
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* 2. Identify the holder (via pidfile + /proc + ss)
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* 3. Attempt graceful SIGTERM if safe (not self, not too young)
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* 4. Retry with exponential backoff instead of process.exit(1)
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* 5. Track port ownership to prevent self-conflicts
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*
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* Inspired by Ruflo's PluginManager error recovery:
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* - Never panic-exit on recoverable errors
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* - Graceful degradation with retry loops
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* - Event-based state tracking
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*/
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import net from 'net';
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import fs from 'fs';
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import { execSync } from 'child_process';
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import { EventEmitter } from 'events';
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import { logger } from '../utils/logger.js';
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export class PortManager extends EventEmitter {
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#state; // 'idle' | 'probing' | 'claiming' | 'owned' | 'releasing' | 'failed'
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#port;
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#owner; // pid of current owner (null if free)
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#pidfile;
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#retryConfig; // { maxAttempts, baseDelayMs, maxDelayMs }
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/**
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* @param {object} opts
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* @param {number} opts.port — port to manage
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* @param {string} [opts.pidfile] — path to pidfile for stale detection
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* @param {number} [opts.maxAttempts=5] — max bind retries
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* @param {number} [opts.baseDelayMs=500] — initial retry delay
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* @param {number} [opts.maxDelayMs=5000] — max retry delay
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*/
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constructor({ port, pidfile, maxAttempts = 5, baseDelayMs = 500, maxDelayMs = 5000 }) {
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super();
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this.#port = port;
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this.#pidfile = pidfile || null;
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this.#owner = null;
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this.#state = 'idle';
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this.#retryConfig = { maxAttempts, baseDelayMs, maxDelayMs };
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}
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get port() { return this.#port; }
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get state() { return this.#state; }
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get owner() { return this.#owner; }
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// ── Core API ──────────────────────────────────────────────
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/**
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* Claim the port for this process. Retries with backoff on EADDRINUSE.
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* Returns a bound http.Server-compatible callback — call it after createServer.
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*
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* @param {import('http').Server} server
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* @returns {Promise<void>}
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*/
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async claim(server) {
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this.#setState('claiming');
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this.#writePidfile(process.pid);
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const inUse = await this.probe();
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if (!inUse) {
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return this.#bind(server);
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}
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// Port occupied — intelligent recovery
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logger.warn(`Port ${this.#port} occupied — starting smart recovery`);
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const holder = this.#identifyHolder();
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if (holder && holder.pid !== process.pid) {
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const age = this.#getProcessAge(holder.pid);
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logger.info(`Holder: PID ${holder.pid}, age: ${age}ms, source: ${holder.source}`);
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if (age !== null && age < 3000) {
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// Sibling process just started (systemd rapid restart) — don't kill, just wait
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logger.warn(`Holder PID ${holder.pid} is only ${Math.round(age / 1000)}s old — waiting for graceful exit`);
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} else if (age !== null && age < 30000) {
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// Recent process — send SIGTERM then wait
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logger.warn(`Sending SIGTERM to PID ${holder.pid} (${Math.round(age / 1000)}s old)`);
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this.#safeKill(holder.pid);
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} else {
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// Old stale process — force kill
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logger.warn(`Stale holder PID ${holder.pid} (${Math.round(age / 1000)}s old) — SIGTERM`);
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this.#safeKill(holder.pid);
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}
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} else if (holder && holder.pid === process.pid) {
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// We already own it? Shouldn't happen but handle gracefully
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logger.info(`Port ${this.#port} already held by this process (PID ${process.pid})`);
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this.#state = 'owned';
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return;
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}
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// Wait for port to free, then bind with retries
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return this.#waitForFreeAndBind(server);
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}
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/**
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* Release the port (cleanup on shutdown)
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*/
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release() {
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this.#setState('releasing');
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this.#owner = null;
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try {
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if (this.#pidfile) fs.unlinkSync(this.#pidfile);
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} catch {}
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this.#setState('idle');
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logger.info(`Port ${this.#port} released`);
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}
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// ── Probing ───────────────────────────────────────────────
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/**
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* Check if port is in use. Returns true if occupied.
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* @returns {Promise<boolean>}
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*/
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probe() {
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return new Promise((resolve) => {
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const sock = net.createServer();
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sock.listen(this.#port, '0.0.0.0', () => {
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sock.close(() => resolve(false)); // free
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});
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sock.on('error', () => resolve(true)); // in use
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});
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}
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// ── Holder identification ─────────────────────────────────
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/**
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* Identify who's holding the port.
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* Checks pidfile first, then ss, then falls back to unknown.
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* @returns {{ pid: number|null, source: string }|null}
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*/
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#identifyHolder() {
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// Method 1: pidfile
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if (this.#pidfile) {
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try {
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const pid = parseInt(fs.readFileSync(this.#pidfile, 'utf8').trim(), 10);
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if (!isNaN(pid) && this.#isAlive(pid)) {
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return { pid, source: 'pidfile' };
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}
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} catch {}
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}
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// Method 2: ss -tlnp
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try {
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const ssOut = execSync(`ss -tlnp 'sport = :${this.#port}' 2>/dev/null`, { encoding: 'utf8' }).trim();
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const match = ssOut.match(/pid=(\d+)/);
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if (match) {
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const pid = parseInt(match[1], 10);
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if (!isNaN(pid)) {
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return { pid, source: 'ss' };
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}
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}
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} catch {}
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// Method 3: lsof fallback
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try {
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const lsofOut = execSync(`lsof -ti :${this.#port} 2>/dev/null`, { encoding: 'utf8' }).trim();
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if (lsofOut) {
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const pid = parseInt(lsofOut.split('\n')[0], 10);
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if (!isNaN(pid)) {
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return { pid, source: 'lsof' };
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}
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}
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} catch {}
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return null;
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}
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// ── Process helpers ───────────────────────────────────────
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#isAlive(pid) {
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try { process.kill(pid, 0); return true; } catch { return false; }
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}
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#getProcessAge(pid) {
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try {
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const stat = fs.readFileSync(`/proc/${pid}/stat`, 'utf8');
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const fields = stat.split(')');
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if (fields.length > 1) {
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const statFields = fields[1].trim().split(/\s+/);
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const startTimeTicks = parseInt(statFields[19], 10);
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if (!isNaN(startTimeTicks)) {
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const bootLine = fs.readFileSync('/proc/stat', 'utf8')
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.split('\n').find(l => l.startsWith('btime '));
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if (bootLine) {
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const bootSec = parseInt(bootLine.split(/\s+/)[1], 10);
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const hz = 100; // USER_HZ on most Linux
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const startSec = bootSec + startTimeTicks / hz;
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return Date.now() - (startSec * 1000);
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}
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}
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}
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} catch {}
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return null; // can't determine age (non-Linux, etc.)
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}
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#safeKill(pid) {
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try {
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process.kill(pid, 'SIGTERM');
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this.emit('kill', { pid, signal: 'SIGTERM' });
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} catch (e) {
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logger.warn(`Failed to kill PID ${pid}: ${e.message}`);
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}
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}
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||||
// ── Bind with retry ───────────────────────────────────────
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||||
async #waitForFreeAndBind(server) {
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const { maxAttempts, baseDelayMs, maxDelayMs } = this.#retryConfig;
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||||
|
||||
for (let attempt = 1; attempt <= maxAttempts; attempt++) {
|
||||
// Wait for port to become free
|
||||
const freed = await this.#pollFree(maxDelayMs);
|
||||
if (!freed) {
|
||||
logger.warn(`Attempt ${attempt}/${maxAttempts}: port still occupied`);
|
||||
}
|
||||
|
||||
// Try to bind
|
||||
try {
|
||||
await this.#bind(server);
|
||||
return; // success
|
||||
} catch (err) {
|
||||
if (err.code === 'EADDRINUSE' && attempt < maxAttempts) {
|
||||
const delay = Math.min(baseDelayMs * Math.pow(2, attempt - 1), maxDelayMs);
|
||||
logger.warn(`EADDRINUSE on attempt ${attempt}/${maxAttempts} — retrying in ${delay}ms`);
|
||||
this.emit('retry', { attempt, maxAttempts, delay, error: err.message });
|
||||
await this.#sleep(delay);
|
||||
} else {
|
||||
this.#setState('failed');
|
||||
this.emit('failed', { error: err.message, attempts: attempt });
|
||||
throw err;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
this.#setState('failed');
|
||||
throw new Error(`Port ${this.#port} unavailable after ${maxAttempts} attempts`);
|
||||
}
|
||||
|
||||
#bind(server) {
|
||||
return new Promise((resolve, reject) => {
|
||||
server.listen(this.#port, '0.0.0.0', () => {
|
||||
this.#owner = process.pid;
|
||||
this.#setState('owned');
|
||||
logger.info(`Port ${this.#port} claimed (PID ${process.pid})`);
|
||||
this.emit('claimed', { port: this.#port, pid: process.pid });
|
||||
resolve();
|
||||
});
|
||||
server.on('error', (err) => {
|
||||
if (err.code === 'EADDRINUSE') {
|
||||
reject(err);
|
||||
} else {
|
||||
logger.error(`Port ${this.#port} bind error: ${err.message}`);
|
||||
this.#setState('failed');
|
||||
reject(err);
|
||||
}
|
||||
});
|
||||
});
|
||||
}
|
||||
|
||||
/**
|
||||
* Poll until port is free or timeout.
|
||||
* @param {number} timeoutMs
|
||||
* @returns {Promise<boolean>} true if free
|
||||
*/
|
||||
#pollFree(timeoutMs) {
|
||||
const interval = 300;
|
||||
const deadline = Date.now() + timeoutMs;
|
||||
return new Promise(async (resolve) => {
|
||||
while (Date.now() < deadline) {
|
||||
if (!(await this.probe())) {
|
||||
resolve(true);
|
||||
return;
|
||||
}
|
||||
await this.#sleep(interval);
|
||||
}
|
||||
resolve(false);
|
||||
});
|
||||
}
|
||||
|
||||
// ── Pidfile ───────────────────────────────────────────────
|
||||
|
||||
#writePidfile(pid) {
|
||||
if (!this.#pidfile) return;
|
||||
try {
|
||||
fs.writeFileSync(this.#pidfile, pid.toString());
|
||||
logger.info(`Pidfile: ${this.#pidfile} (PID ${pid})`);
|
||||
} catch (e) {
|
||||
logger.warn(`Pidfile write failed: ${e.message}`);
|
||||
}
|
||||
}
|
||||
|
||||
// ── State machine ─────────────────────────────────────────
|
||||
|
||||
#setState(next) {
|
||||
const prev = this.#state;
|
||||
this.#state = next;
|
||||
if (prev !== next) {
|
||||
this.emit('stateChange', { from: prev, to: next });
|
||||
}
|
||||
}
|
||||
|
||||
#sleep(ms) {
|
||||
return new Promise(r => setTimeout(r, ms));
|
||||
}
|
||||
|
||||
// ── Diagnostics ───────────────────────────────────────────
|
||||
|
||||
/**
|
||||
* Get current status for /status commands and health checks.
|
||||
*/
|
||||
getStatus() {
|
||||
return {
|
||||
port: this.#port,
|
||||
state: this.#state,
|
||||
owner: this.#owner,
|
||||
pidfile: this.#pidfile,
|
||||
processPid: process.pid,
|
||||
};
|
||||
}
|
||||
}
|
||||
|
||||
export default PortManager;
|
||||
Reference in New Issue
Block a user