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https://github.com/screentinker/screentinker.git
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f037dd476a
The fleet SNATs to one IP, so nothing on the OTA path may key on IP. - /api/update/check: EARLY-RETURN before any filesystem call when the breaker won't offer (rate-backoff / up-to-date / phantom / client-newer). A looping client that gets rate-backoff now does ZERO fs — the flood can't become a statSync flood. - lib/apk-cache.js: resolve APK path/size/mtime once at boot + refresh on an interval; the check/download endpoints read cached metadata (get() does no fs, proven by test). - lib/ota-download-guard.js + /download/apk: GLOBAL concurrency + rate caps + critical- band shed (503 Retry-After), NEVER per-IP. Replaces the per-IP-per-10min log throttle (which hid the flood under SNAT) with a per-window served/shed aggregate so a download flood is VISIBLE. Bounded single rolling-state object; in-flight released on finish/close. - Breaker unchanged; no IP limiting or device_id requirement added (legacy field clients send no device_id on OTA checks — must keep working). Tests: apk-cache get() = 0 statSync over 1000 reads; download guard sheds past global concurrency + per-window rate + critical band; admit() has no IP parameter. Suite 259/259. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
40 lines
1.4 KiB
JavaScript
40 lines
1.4 KiB
JavaScript
'use strict';
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// #146 hardening (Item C) — cache the OTA APK resolution so no /api/update/check or
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// /download/apk does a per-request synchronous filesystem call. The path/size/mtime are
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// resolved once at boot and refreshed on an interval (like the frontend-hash refresh),
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// so a poll/download flood can't turn into an existsSync/statSync flood on the loop.
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const fs = require('fs');
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const path = require('path');
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const config = require('../config');
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// A copy under DATA_DIR wins (container operators mount /data/ScreenTinker.apk),
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// else the legacy in-repo root path — same order as the old resolveApkPath().
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function candidates() {
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return [path.join(config.dataDir, 'ScreenTinker.apk'), path.join(__dirname, '..', '..', 'ScreenTinker.apk')];
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}
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let cache = { path: null, exists: false, size: 0, mtime: 0 };
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function refresh() {
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for (const p of candidates()) {
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try { const st = fs.statSync(p); cache = { path: p, exists: true, size: st.size, mtime: st.mtimeMs }; return cache; } catch (_) { /* next */ }
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}
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cache = { path: null, exists: false, size: 0, mtime: 0 };
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return cache;
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}
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function get() { return cache; }
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let timer = null;
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function start() {
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refresh(); // resolve once at boot
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if (!timer) {
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timer = setInterval(refresh, config.otaApkRefreshMs);
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if (timer.unref) timer.unref();
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}
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return cache;
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}
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module.exports = { start, refresh, get };
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