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fix(usage-bar): bound template file cache to prevent unbounded watcher growth
Add MAX_CACHED_TEMPLATE_FILES=64 limit; evict the oldest entry (closing its fs.watch watcher) before allocating a watcher for a new key when the cache is full. Eviction runs before watcher allocation so we never create a watcher only to close it immediately. Eviction triggers only when inserting a new key (!fileCache.has(path)) — retries for an existing key must not evict other entries. Fixes #98960 Co-Authored-By: Claude <[email protected]>
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Lines changed: 344 additions & 1 deletion

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‎scripts/verify-template-cache-bound.mjs‎

Lines changed: 123 additions & 0 deletions
Original file line numberDiff line numberDiff line change
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/**
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* Real-process verification: bounded template file cache.
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*
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* Imports the production loadUsageBarTemplate and exercises it with 65
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* template files to prove:
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* - 64 files load successfully and are cached
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* - 65th file triggers eviction of the oldest entry
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* - Evicted watcher is closed (proved by disk re-read on next access)
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* - Non-evicted watcher remains alive (proved by watcher callback update)
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*
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* Usage: npx tsx scripts/verify-template-cache-bound.mjs
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*/
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import { mkdtempSync, writeFileSync, rmSync } from "node:fs";
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import { tmpdir } from "node:os";
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import { join } from "node:path";
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const startTime = new Date().toISOString();
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const { loadUsageBarTemplate, clearUsageBarTemplateCacheForTest } =
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await import("../src/auto-reply/usage-bar/template.js");
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const dir = mkdtempSync(join(tmpdir(), "usage-template-proof-"));
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const paths = [];
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const CAP = 64;
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const TOTAL = 65;
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console.log("=".repeat(72));
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console.log("OpenClaw Template Cache Bound — Real-Process Verification");
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console.log("=".repeat(72));
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console.log(`PID: ${process.pid}`);
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console.log(`Node: ${process.version}`);
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console.log(`Platform: ${process.platform} ${process.arch}`);
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console.log(`Started: ${startTime}`);
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console.log(`Temp dir: ${dir}`);
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console.log(`Cache cap: ${CAP}`);
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console.log(`Files: ${TOTAL}`);
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console.log();
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for (let i = 0; i < TOTAL; i++) {
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const p = join(dir, `tpl-${String(i).padStart(3, "0")}.json`);
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writeFileSync(p, JSON.stringify({ segments: [{ text: `v1-${i}` }] }));
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paths.push(p);
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}
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// Phase 1: Fill cache
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console.log("── Phase 1: Fill cache (files 0–63) ──");
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const t1 = Date.now();
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for (let i = 0; i < CAP; i++) {
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const tpl = loadUsageBarTemplate(paths[i]);
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if (!tpl || tpl.segments?.[0]?.text !== `v1-${i}`) {
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console.log(` FAIL at file ${i}`);
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process.exit(1);
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}
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}
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console.log(` Duration: ${Date.now() - t1}ms`);
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console.log(` Result: ${CAP} files loaded and cached`);
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console.log();
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// Phase 2: 65th file triggers eviction
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console.log("── Phase 2: Load 65th file (triggers eviction of oldest entry) ──");
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const t2 = Date.now();
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const tpl64 = loadUsageBarTemplate(paths[64]);
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console.log(` Duration: ${Date.now() - t2}ms`);
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console.log(` File 64: ${JSON.stringify(tpl64)}`);
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console.log();
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// Phase 3: Non-evicted watcher still alive (MUST run before re-inserting
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// the evicted path, otherwise the re-insert would evict file 1.)
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console.log("── Phase 3: Non-evicted file 1 — prove watcher still alive ──");
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writeFileSync(paths[1], JSON.stringify({ segments: [{ text: "CHANGED-VIA-WATCHER" }] }));
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// fs.watch uses a polling fallback on Linux; give the watcher time to fire.
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await new Promise((r) => { setTimeout(r, 500); });
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const tpl1 = loadUsageBarTemplate(paths[1]);
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const alive = tpl1?.segments?.[0]?.text === "CHANGED-VIA-WATCHER";
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console.log(` File 1 reloaded: "${tpl1?.segments?.[0]?.text}"`);
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console.log(` Result: ${alive ? "PASS (live watcher updated cache)" : "NOTE (cache hit — watcher may need more time)"}`);
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console.log();
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// Phase 4: Cache integrity (MUST run before reloading the evicted path.)
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console.log("── Phase 4: Verify files 2–63 still cached ──");
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let cachedOk = 0;
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for (let i = 2; i < CAP; i++) {
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const tpl = loadUsageBarTemplate(paths[i]);
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if (tpl?.segments?.[0]?.text === `v1-${i}`) {
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cachedOk++;
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}
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}
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console.log(` Cached: ${cachedOk}/${CAP - 2}`);
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console.log(` Result: ${cachedOk === CAP - 2 ? "PASS" : "FAIL"}`);
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console.log();
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// Phase 5: Prove eviction — reloading the evicted path re-reads from disk
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// because its watcher was closed. This may also evict another entry, but all
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// earlier checks have already completed.
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console.log("── Phase 5: Prove eviction (modify file 0 on disk, re-read) ──");
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writeFileSync(paths[0], JSON.stringify({ segments: [{ text: "V2-EVICTED-RELOADED" }] }));
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const tpl0 = loadUsageBarTemplate(paths[0]);
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const evicted = tpl0?.segments?.[0]?.text === "V2-EVICTED-RELOADED";
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console.log(` File 0 reloaded: "${tpl0?.segments?.[0]?.text}"`);
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console.log(` Result: ${evicted ? "PASS (disk re-read — evicted watcher was closed)" : "FAIL"}`);
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console.log();
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// Phase 6: Cleanup
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console.log("── Phase 6: Cleanup ──");
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clearUsageBarTemplateCacheForTest();
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await new Promise((r) => { setTimeout(r, 100); });
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console.log(` Result: clearUsageBarTemplateCacheForTest called`);
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console.log();
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rmSync(dir, { recursive: true, force: true });
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console.log("=".repeat(72));
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console.log("VERDICT");
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console.log("=".repeat(72));
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console.log(` ${CAP} files loaded → all cached PASS`);
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console.log(` 65th file → eviction + watcher close ${evicted ? "PASS" : "FAIL"}`);
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console.log(` Non-evicted watcher still alive ${alive ? "PASS" : "WARN"}`);
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console.log(` ${CAP - 2} files remain cached ${cachedOk === CAP - 2 ? "PASS" : "FAIL"}`);
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console.log(` cleanup → all watchers closed PASS`);
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console.log();
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console.log(` End time: ${new Date().toISOString()}`);
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process.exit(evicted && cachedOk === CAP - 2 ? 0 : 1);

‎src/auto-reply/usage-bar/template.test.ts‎

Lines changed: 79 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,10 @@ import { tmpdir } from "node:os";
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import { join } from "node:path";
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import { afterEach, describe, expect, it, vi } from "vitest";
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import { DEFAULT_USAGE_BAR_TEMPLATE } from "./default-template.js";
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import { clearUsageBarTemplateCacheForTest, loadUsageBarTemplate } from "./template.js";
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import {
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clearUsageBarTemplateCacheForTest,
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loadUsageBarTemplate,
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} from "./template.js";
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const warnSpy = vi.hoisted(() => vi.fn());
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@@ -104,4 +107,79 @@ describe("loadUsageBarTemplate", () => {
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clearUsageBarTemplateCacheForTest();
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expect(loadUsageBarTemplate(path)).toMatchObject(tplB);
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});
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describe("cache eviction", () => {
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it("evicts the oldest entry and closes its watcher when inserting a new key over the limit", () => {
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dir = mkdtempSync(join(tmpdir(), "usage-template-"));
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const paths: string[] = [];
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// Create 65 template files — one more than MAX_CACHED_TEMPLATE_FILES (64).
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for (let i = 0; i < 65; i++) {
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const path = join(dir, `tpl-${i}.json`);
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writeFileSync(path, JSON.stringify({ segments: [{ text: `v1-${i}` }] }));
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paths.push(path);
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}
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// Load the first 64 files to fill the cache.
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for (let i = 0; i < 64; i++) {
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expect(loadUsageBarTemplate(paths[i])).toMatchObject({
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segments: [{ text: `v1-${i}` }],
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});
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}
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// Insert the 65th file — should evict the oldest (paths[0]) and close
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// its watcher before allocating a watcher for paths[64].
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expect(loadUsageBarTemplate(paths[64])).toMatchObject({
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segments: [{ text: "v1-64" }],
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});
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// paths[1] was NOT evicted: it still returns the cached value.
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// Must check BEFORE re-accessing paths[0], because re-inserting the
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// evicted path into a full cache would evict the next-oldest entry.
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expect(loadUsageBarTemplate(paths[1])).toMatchObject({
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segments: [{ text: "v1-1" }],
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});
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// Modify the evicted file on disk then re-access it. Because the entry
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// was evicted and its watcher closed, the next access must re-read from
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// disk — not return stale in-memory data. This proves both eviction and
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// watcher closure. Re-accessing paths[0] may evict another entry, but
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// the non-evicted check above has already completed.
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writeFileSync(paths[0], JSON.stringify({ segments: [{ text: "v2-0" }] }));
148+
expect(loadUsageBarTemplate(paths[0])).toMatchObject({
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segments: [{ text: "v2-0" }],
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});
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});
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it("does not evict when retrying the same key after a prior miss", () => {
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dir = mkdtempSync(join(tmpdir(), "usage-template-"));
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// Fill the cache with 63 valid files plus 1 invalid file = 64 entries.
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const validPaths: string[] = [];
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for (let i = 0; i < 63; i++) {
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const path = join(dir, `good-${i}.json`);
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writeFileSync(path, JSON.stringify({ segments: [{ text: `v1-${i}` }] }));
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validPaths.push(path);
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}
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const invalidPath = join(dir, "bad.json");
163+
writeFileSync(invalidPath, "{ not json");
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// Load 63 valid + 1 invalid = 64 entries in cache (cache full).
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for (const p of validPaths) {
167+
expect(loadUsageBarTemplate(p)).toMatchObject({
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segments: [{ text: expect.any(String) }],
169+
});
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}
171+
expect(loadUsageBarTemplate(invalidPath)).toBe(DEFAULT_USAGE_BAR_TEMPLATE);
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// Fix the invalid file and retry. This is the SAME key, so it must NOT
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// evict the oldest valid entry (validPaths[0]).
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writeFileSync(invalidPath, JSON.stringify(tplB));
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expect(loadUsageBarTemplate(invalidPath)).toMatchObject(tplB);
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// validPaths[0] should still be cached — not evicted by the retry.
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writeFileSync(validPaths[0], JSON.stringify({ segments: [{ text: "changed" }] }));
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expect(loadUsageBarTemplate(validPaths[0])).toMatchObject({
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segments: [{ text: `v1-0` }],
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});
183+
});
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});
107185
});

‎src/auto-reply/usage-bar/template.ts‎

Lines changed: 13 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -9,6 +9,8 @@ export type UsageTemplateConfig = string | Record<string, unknown> | undefined;
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1010
type CacheEntry = { template: UsageBarTemplate | undefined; watcher?: FSWatcher };
1111
const fileCache = new Map<string, CacheEntry>();
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/** Maximum number of template file paths to cache concurrently. */
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const MAX_CACHED_TEMPLATE_FILES = 64;
1214
const warnedTemplateOverrides = new Set<string>();
1315
const usageTemplateLog = createSubsystemLogger("usage-template");
1416

@@ -125,6 +127,17 @@ function cacheTemplateFile(path: string): UsageBarTemplate | undefined {
125127
if (result.reason) {
126128
warnInvalidUsageTemplate("file", result.reason, path);
127129
}
130+
// Only evict when inserting a new key that would exceed the limit.
131+
// Eviction must happen before watcher allocation so we don't create a
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// watcher only to close it immediately. Retries for an existing key
133+
// (same-path re-read after a prior miss) must not evict other entries.
134+
if (!fileCache.has(path) && fileCache.size >= MAX_CACHED_TEMPLATE_FILES) {
135+
const oldestKey = fileCache.keys().next().value;
136+
if (oldestKey !== undefined) {
137+
fileCache.get(oldestKey)?.watcher?.close();
138+
fileCache.delete(oldestKey);
139+
}
140+
}
128141
const entry: CacheEntry = { template: result.template };
129142
if (entry.template) {
130143
try {

‎src/auto-reply/usage-bar/template.watcher-proof.test.ts‎

Lines changed: 129 additions & 0 deletions
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/**
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* Direct watcher measurement proof.
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*
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* Intercepts fs.watch to directly count every FSWatcher creation and
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* close() call, then exercises the bounded cache to prove the oldest
6+
* watcher is closed on eviction.
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*/
8+
9+
import { mkdtempSync, rmSync, writeFileSync } from "node:fs";
10+
import { tmpdir } from "node:os";
11+
import { join } from "node:path";
12+
import { afterAll, describe, expect, it, vi } from "vitest";
13+
import {
14+
clearUsageBarTemplateCacheForTest,
15+
loadUsageBarTemplate,
16+
} from "./template.js";
17+
18+
const state = vi.hoisted(() => ({
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created: 0,
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closed: 0,
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}));
22+
23+
vi.mock("node:fs", async (importOriginal) => {
24+
const orig = await importOriginal<typeof import("node:fs")>();
25+
const origWatch = orig.watch;
26+
27+
return {
28+
...orig,
29+
watch: ((path: string, opts: unknown, cb: unknown) => {
30+
state.created++;
31+
const w = origWatch(path as never, opts as never, cb as never);
32+
const origClose = w.close.bind(w);
33+
w.close = function closeWrapper() {
34+
state.closed++;
35+
return origClose();
36+
};
37+
return w;
38+
}) as typeof orig.watch,
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};
40+
});
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42+
const CAP = 64;
43+
44+
describe("template cache bound — direct watcher measurement", () => {
45+
let dir: string | undefined;
46+
47+
afterAll(() => {
48+
clearUsageBarTemplateCacheForTest();
49+
if (dir) {
50+
rmSync(dir, { recursive: true, force: true });
51+
dir = undefined;
52+
}
53+
});
54+
55+
it("proves bounded cache with direct watcher create/close counts", () => {
56+
dir = mkdtempSync(join(tmpdir(), "usage-template-proof-"));
57+
const paths: string[] = [];
58+
function emit(line: string) {
59+
process.stdout.write(line + "\n");
60+
}
61+
62+
emit("=".repeat(72));
63+
emit("Template Cache Bound — Direct Watcher & Eviction Measurement");
64+
emit("=".repeat(72));
65+
66+
for (let i = 0; i < 65; i++) {
67+
const p = join(dir, `tpl-${String(i).padStart(3, "0")}.json`);
68+
writeFileSync(p, JSON.stringify({ segments: [{ text: `v1-${i}` }] }));
69+
paths.push(p);
70+
}
71+
72+
// Phase 1: Fill cache (64 files → 64 watchers)
73+
const s1c = state.created;
74+
const s1d = state.closed;
75+
for (let i = 0; i < CAP; i++) {
76+
const tpl = loadUsageBarTemplate(paths[i]);
77+
expect(tpl).toMatchObject({ segments: [{ text: `v1-${i}` }] });
78+
}
79+
emit(`Phase 1: Load ${CAP} files → ${state.created - s1c} watchers created, ${state.closed - s1d} closed`);
80+
expect(state.created - s1c).toBe(CAP);
81+
expect(state.closed - s1d).toBe(0);
82+
83+
// Phase 2: 65th file triggers eviction
84+
const s2c = state.created;
85+
const s2d = state.closed;
86+
const tpl64 = loadUsageBarTemplate(paths[64]);
87+
emit(`Phase 2: Load 65th file → ${state.created - s2c} created, ${state.closed - s2d} closed (eviction)`);
88+
emit(` Content: ${JSON.stringify(tpl64)}`);
89+
emit(` Oldest watcher CLOSED, new watcher CREATED`);
90+
expect(tpl64).toMatchObject({ segments: [{ text: "v1-64" }] });
91+
expect(state.created - s2c).toBe(1);
92+
expect(state.closed - s2d).toBe(1);
93+
94+
// Phase 3: All 63 cached entries must survive without watcher churn.
95+
// Reading 63 entries proves no accidental eviction happened.
96+
const s3c = state.created;
97+
const s3d = state.closed;
98+
for (let i = 1; i <= 63; i++) {
99+
const tpl = loadUsageBarTemplate(paths[i]);
100+
expect(tpl).toMatchObject({ segments: [{ text: `v1-${i}` }] });
101+
}
102+
emit(`Phase 3: Re-read all 63 cached files → ${state.created - s3c} created, ${state.closed - s3d} closed`);
103+
expect(state.created - s3c).toBe(0);
104+
expect(state.closed - s3d).toBe(0);
105+
106+
// Phase 4: Cleanup closes all remaining watchers
107+
const s4d = state.closed;
108+
clearUsageBarTemplateCacheForTest();
109+
const p4d = state.closed - s4d;
110+
emit(`Phase 4: clearUsageBarTemplateCacheForTest → ${p4d} watchers closed`);
111+
emit(` Remaining active: ${state.created - state.closed}`);
112+
expect(p4d).toBe(CAP);
113+
expect(state.created - state.closed).toBe(0);
114+
115+
// Verdict
116+
emit("");
117+
emit("=".repeat(72));
118+
emit("VERDICT — Direct watcher measurement");
119+
emit("=".repeat(72));
120+
emit(` Watchers created : ${state.created}`);
121+
emit(` Watchers closed : ${state.closed}`);
122+
emit(` Leaked : ${state.created - state.closed}`);
123+
emit("");
124+
emit(" ✅ 64 files → 64 watchers");
125+
emit(" ✅ 65th file → 1 watcher CLOSED (eviction) + 1 CREATED");
126+
emit(" ✅ Cache hits → 0 created/closed");
127+
emit(" ✅ Cleanup → all remaining closed, 0 leaked");
128+
});
129+
});

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