feat: mosaic gateway CLI daemon management + admin token auth (#369)

packages/cli/src/commands/gateway/daemon.ts

@@ -0,0 +1,253 @@
+import { spawn, execSync } from 'node:child_process';
+import {
+  existsSync,
+  mkdirSync,
+  readFileSync,
+  writeFileSync,
+  unlinkSync,
+  openSync,
+  constants,
+} from 'node:fs';
+import { join, resolve } from 'node:path';
+import { homedir } from 'node:os';
+import { createRequire } from 'node:module';
+
+// ─── Paths ──────────────────────────────────────────────────────────────────
+
+export const GATEWAY_HOME = resolve(
+  process.env['MOSAIC_GATEWAY_HOME'] ?? join(homedir(), '.config', 'mosaic', 'gateway'),
+);
+export const PID_FILE = join(GATEWAY_HOME, 'daemon.pid');
+export const LOG_DIR = join(GATEWAY_HOME, 'logs');
+export const LOG_FILE = join(LOG_DIR, 'gateway.log');
+export const ENV_FILE = join(GATEWAY_HOME, '.env');
+export const META_FILE = join(GATEWAY_HOME, 'meta.json');
+
+// ─── Meta ───────────────────────────────────────────────────────────────────
+
+export interface GatewayMeta {
+  version: string;
+  installedAt: string;
+  entryPoint: string;
+  adminToken?: string;
+  host: string;
+  port: number;
+}
+
+export function readMeta(): GatewayMeta | null {
+  if (!existsSync(META_FILE)) return null;
+  try {
+    return JSON.parse(readFileSync(META_FILE, 'utf-8')) as GatewayMeta;
+  } catch {
+    return null;
+  }
+}
+
+export function writeMeta(meta: GatewayMeta): void {
+  ensureDirs();
+  writeFileSync(META_FILE, JSON.stringify(meta, null, 2), { mode: 0o600 });
+}
+
+// ─── Directories ────────────────────────────────────────────────────────────
+
+export function ensureDirs(): void {
+  mkdirSync(GATEWAY_HOME, { recursive: true, mode: 0o700 });
+  mkdirSync(LOG_DIR, { recursive: true, mode: 0o700 });
+}
+
+// ─── PID management ─────────────────────────────────────────────────────────
+
+export function readPid(): number | null {
+  if (!existsSync(PID_FILE)) return null;
+  try {
+    const pid = parseInt(readFileSync(PID_FILE, 'utf-8').trim(), 10);
+    return Number.isNaN(pid) ? null : pid;
+  } catch {
+    return null;
+  }
+}
+
+export function isRunning(pid: number): boolean {
+  try {
+    process.kill(pid, 0);
+    return true;
+  } catch {
+    return false;
+  }
+}
+
+export function getDaemonPid(): number | null {
+  const pid = readPid();
+  if (pid === null) return null;
+  return isRunning(pid) ? pid : null;
+}
+
+// ─── Entry point resolution ─────────────────────────────────────────────────
+
+export function resolveGatewayEntry(): string {
+  // Check meta.json for custom entry point
+  const meta = readMeta();
+  if (meta?.entryPoint && existsSync(meta.entryPoint)) {
+    return meta.entryPoint;
+  }
+
+  // Try to resolve from globally installed @mosaicstack/gateway
+  try {
+    const req = createRequire(import.meta.url);
+    const pkgPath = req.resolve('@mosaicstack/gateway/package.json');
+    const mainEntry = join(resolve(pkgPath, '..'), 'dist', 'main.js');
+    if (existsSync(mainEntry)) return mainEntry;
+  } catch {
+    // Not installed globally via @mosaicstack
+  }
+
+  // Try @mosaic/gateway (workspace / dev)
+  try {
+    const req = createRequire(import.meta.url);
+    const pkgPath = req.resolve('@mosaic/gateway/package.json');
+    const mainEntry = join(resolve(pkgPath, '..'), 'dist', 'main.js');
+    if (existsSync(mainEntry)) return mainEntry;
+  } catch {
+    // Not available
+  }
+
+  throw new Error('Cannot find gateway entry point. Run `mosaic gateway install` first.');
+}
+
+// ─── Start / Stop / Health ──────────────────────────────────────────────────
+
+export function startDaemon(): number {
+  const running = getDaemonPid();
+  if (running !== null) {
+    throw new Error(`Gateway is already running (PID ${running.toString()})`);
+  }
+
+  ensureDirs();
+  const entryPoint = resolveGatewayEntry();
+
+  // Load env vars from gateway .env
+  const env: Record<string, string> = { ...process.env } as Record<string, string>;
+  if (existsSync(ENV_FILE)) {
+    for (const line of readFileSync(ENV_FILE, 'utf-8').split('\n')) {
+      const trimmed = line.trim();
+      if (!trimmed || trimmed.startsWith('#')) continue;
+      const eqIdx = trimmed.indexOf('=');
+      if (eqIdx > 0) env[trimmed.slice(0, eqIdx)] = trimmed.slice(eqIdx + 1);
+    }
+  }
+
+  const logFd = openSync(LOG_FILE, constants.O_WRONLY | constants.O_CREAT | constants.O_APPEND);
+
+  const child = spawn('node', [entryPoint], {
+    detached: true,
+    stdio: ['ignore', logFd, logFd],
+    env,
+    cwd: GATEWAY_HOME,
+  });
+
+  if (!child.pid) {
+    throw new Error('Failed to spawn gateway process');
+  }
+
+  writeFileSync(PID_FILE, child.pid.toString(), { mode: 0o600 });
+  child.unref();
+
+  return child.pid;
+}
+
+export async function stopDaemon(timeoutMs = 10_000): Promise<void> {
+  const pid = getDaemonPid();
+  if (pid === null) {
+    throw new Error('Gateway is not running');
+  }
+
+  process.kill(pid, 'SIGTERM');
+
+  // Poll for exit
+  const start = Date.now();
+  while (Date.now() - start < timeoutMs) {
+    if (!isRunning(pid)) {
+      cleanPidFile();
+      return;
+    }
+    await sleep(250);
+  }
+
+  // Force kill
+  try {
+    process.kill(pid, 'SIGKILL');
+  } catch {
+    // Already dead
+  }
+  cleanPidFile();
+}
+
+function cleanPidFile(): void {
+  try {
+    unlinkSync(PID_FILE);
+  } catch {
+    // Ignore
+  }
+}
+
+export async function waitForHealth(
+  host: string,
+  port: number,
+  timeoutMs = 30_000,
+): Promise<boolean> {
+  const start = Date.now();
+  let delay = 500;
+
+  while (Date.now() - start < timeoutMs) {
+    try {
+      const res = await fetch(`http://${host}:${port.toString()}/health`);
+      if (res.ok) return true;
+    } catch {
+      // Not ready yet
+    }
+    await sleep(delay);
+    delay = Math.min(delay * 1.5, 3000);
+  }
+  return false;
+}
+
+function sleep(ms: number): Promise<void> {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
+// ─── npm install helper ─────────────────────────────────────────────────────
+
+export function installGatewayPackage(): void {
+  console.log('Installing @mosaicstack/gateway...');
+  execSync('npm install -g @mosaicstack/gateway@latest', {
+    stdio: 'inherit',
+    timeout: 120_000,
+  });
+}
+
+export function uninstallGatewayPackage(): void {
+  try {
+    execSync('npm uninstall -g @mosaicstack/gateway', {
+      stdio: 'inherit',
+      timeout: 60_000,
+    });
+  } catch {
+    console.warn('Warning: npm uninstall may not have completed cleanly.');
+  }
+}
+
+export function getInstalledGatewayVersion(): string | null {
+  try {
+    const output = execSync('npm ls -g @mosaicstack/gateway --json --depth=0', {
+      encoding: 'utf-8',
+      timeout: 15_000,
+      stdio: ['pipe', 'pipe', 'pipe'],
+    });
+    const data = JSON.parse(output) as {
+      dependencies?: { '@mosaicstack/gateway'?: { version?: string } };
+    };
+    return data.dependencies?.['@mosaicstack/gateway']?.version ?? null;
+  } catch {
+    return null;
+  }
+}