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fix: [#838] address fourth-pass re-review — split 451 TTL + cover LRU re-touch + fix stale doc
Reviewer surfaced four issues. Three actionable: 1. STALE HEADER DOC — header comment listed `ref` as a stripped param, but the exclusion block immediately below explains we deliberately keep it. Future readers would hit cognitive whiplash. Removed `ref` from the inline list; switched the cache description to "process- level" (more accurate — Map is module-scope, persists across logical sessions in daemon/MCP mode). 2. SPLIT 451 TTL (webfetch.ts) — 404/410 are resource-permanent (30 min stays right). 451 is observer-conditional: an agent that swaps networks (VPN, travel, hotspot) inside a long-cache window would be locked out of URLs that are reachable from the new vantage point. Added FAILURE_CACHE_TTL_451 = 5 min and ttlForStatus() helper. 3. LRU RE-TOUCH WAS UNTESTED — the most subtle change in the original PR (delete-then-set so frequently-failing URLs don't sit at the head of the FIFO) had zero test coverage. Exposed three test-only helpers (_cacheUrlFailureForTest, _failureCacheKeysInOrder, _isUrlCachedFailureForTest) and added 6 cache state-machine tests: - cacheUrlFailure → isUrlCachedFailure round-trip - only 404/410/451 are cached (other statuses ignored) - tracking-param variations all hit the same cache key - re-touch moves entry to tail (pins the LRU contract) - 451 + 410 entries coexist (TTL split is wired) - _resetFailureCache actually clears cached entries 29/29 tests pass; marker check clean. Closes #838 Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>
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Lines changed: 142 additions & 18 deletions

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‎packages/opencode/src/tool/webfetch.ts‎

Lines changed: 53 additions & 14 deletions
Original file line numberDiff line numberDiff line change
@@ -15,21 +15,28 @@ const BROWSER_UA =
1515
// Status codes that warrant a retry with a different User-Agent
1616
const RETRYABLE_STATUSES = new Set([403, 406])
1717

18-
// altimate_change start — session-level URL failure cache (#471)
19-
// Prevents repeated fetches to URLs that already returned 404/410 in this session.
18+
// altimate_change start — process-level URL failure cache (#471)
19+
// Prevents repeated fetches to URLs that already returned 404/410 in this
20+
// process. Cache is module-scope so in daemon mode (`altimate serve`) and
21+
// long-running MCP servers it persists across logical sessions — fine for
22+
// 404/410 (resource-permanent) but worth flagging for 451 (geo/legal block,
23+
// observer-conditional). See cacheUrlFailure comment for TTL rationale.
2024
//
2125
// 2026-05-22 follow-up to telemetry-2026-05-21 (486 residual webfetch 404s,
2226
// down from March's 2,222 but still meaningful):
2327
// - Extended TTL from 5 min to 30 min. URLs that 404 rarely self-heal
2428
// within a session, and many sessions run longer than 5 min so the
2529
// short window was letting agents re-hit the same dead URL multiple
2630
// times in one session.
27-
// - Cache key is the URL with tracking-only params (utm_*, ref, fbclid,
28-
// gclid, mc_*, _ga, _gl, igshid, mibextid, __cf_chl_*) stripped, so
29-
// LLM-generated tracking variations of a known-bad URL all hit cache.
30-
// Functional query params (page, id, q, etc.) are preserved.
31+
// - Cache key is the URL with tracking-only params (utm_*, fbclid,
32+
// gclid, mc_*, _ga, _gl, igshid, mibextid, __cf_chl_*, plus HubSpot/
33+
// Marketo/Adobe/Matomo variants) stripped, so LLM-generated tracking
34+
// variations of a known-bad URL all hit cache. Functional query params
35+
// (page, id, q, ref, etc.) are preserved — see exclusions block below
36+
// for the rationale on `ref` specifically.
3137
const failedUrls = new Map<string, { status: number; timestamp: number }>()
32-
const FAILURE_CACHE_TTL = 30 * 60 * 1000 // 30 minutes
38+
const FAILURE_CACHE_TTL = 30 * 60 * 1000 // 30 minutes — 404/410 (resource-permanent)
39+
const FAILURE_CACHE_TTL_451 = 5 * 60 * 1000 // 5 minutes — 451 is observer-conditional (VPN swap, travel)
3340

3441
/**
3542
* Param names that are universally tracking-only — stripping them never
@@ -135,11 +142,15 @@ export function normalizeUrlForCache(url: string): string {
135142
}
136143
}
137144

145+
function ttlForStatus(status: number): number {
146+
return status === 451 ? FAILURE_CACHE_TTL_451 : FAILURE_CACHE_TTL
147+
}
148+
138149
function isUrlCachedFailure(url: string): { status: number } | null {
139150
const key = normalizeUrlForCache(url)
140151
const entry = failedUrls.get(key)
141152
if (!entry) return null
142-
if (Date.now() - entry.timestamp > FAILURE_CACHE_TTL) {
153+
if (Date.now() - entry.timestamp > ttlForStatus(entry.status)) {
143154
failedUrls.delete(key)
144155
return null
145156
}
@@ -149,12 +160,15 @@ function isUrlCachedFailure(url: string): { status: number } | null {
149160
const MAX_CACHED_URLS = 500
150161

151162
function cacheUrlFailure(url: string, status: number): void {
152-
// 404 (permanent), 410 (gone), and 451 (legal block) get the same TTL
153-
// here intentionally. 410 is spec-permanent (won't lift), 404 is
154-
// overwhelmingly permanent in practice (typos, removed docs), and 451
155-
// can lift but rarely within a single session. Caching all three at
156-
// 30 min is a deliberate simplification — split TTLs would be marginal
157-
// complexity for marginal benefit.
163+
// TTL by status:
164+
// 404 (resource not found) + 410 (gone) — 30 min. Both are
165+
// resource-permanent; 410 is spec-permanent, 404 is overwhelmingly
166+
// permanent in practice (typos, removed docs).
167+
// 451 (unavailable for legal reasons) — 5 min. Observer-conditional:
168+
// if the agent swaps networks (VPN, travel, mobile hotspot) the URL
169+
// may become reachable from the new vantage point, so a long TTL is
170+
// wrong. 5 min keeps the immediate-retry suppression but lets a
171+
// network change unblock the URL.
158172
if (status === 404 || status === 410 || status === 451) {
159173
const key = normalizeUrlForCache(url)
160174
// Re-touch semantics: if the key is already in the cache, delete first
@@ -187,6 +201,31 @@ export function _failureCacheSize(): number {
187201
return failedUrls.size
188202
}
189203

204+
/**
205+
* Drive the cache state machine from tests — same code path as production.
206+
* @internal — only used by tests; do not call from production code.
207+
*/
208+
export function _cacheUrlFailureForTest(url: string, status: number): void {
209+
cacheUrlFailure(url, status)
210+
}
211+
212+
/**
213+
* Read cache key insertion order — the order entries would be evicted under
214+
* FIFO/LRU pressure. Returns normalized cache keys, not raw URLs.
215+
* @internal — only used by tests; do not call from production code.
216+
*/
217+
export function _failureCacheKeysInOrder(): string[] {
218+
return [...failedUrls.keys()]
219+
}
220+
221+
/**
222+
* Probe the cache for a URL — same code path as production lookups.
223+
* @internal — only used by tests; do not call from production code.
224+
*/
225+
export function _isUrlCachedFailureForTest(url: string): { status: number } | null {
226+
return isUrlCachedFailure(url)
227+
}
228+
190229
/** Strip query string from URL to avoid leaking auth tokens in error messages. */
191230
function sanitizeUrl(url: string): string {
192231
try {

‎packages/opencode/test/tool/webfetch-cache.test.ts‎

Lines changed: 89 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -3,6 +3,9 @@ import {
33
normalizeUrlForCache,
44
_resetFailureCache,
55
_failureCacheSize,
6+
_cacheUrlFailureForTest,
7+
_failureCacheKeysInOrder,
8+
_isUrlCachedFailureForTest,
69
} from "../../src/tool/webfetch"
710

811
/**
@@ -226,12 +229,94 @@ describe("normalizeUrlForCache", () => {
226229
})
227230
})
228231

229-
describe("failure cache helpers", () => {
230-
test("_resetFailureCache empties the cache", () => {
232+
describe("failure cache state machine", () => {
233+
test("cacheUrlFailure → isUrlCachedFailure round-trips", () => {
234+
_cacheUrlFailureForTest("https://example.com/dead", 404)
235+
expect(_failureCacheSize()).toBe(1)
236+
expect(_isUrlCachedFailureForTest("https://example.com/dead")).toEqual({ status: 404 })
237+
})
238+
239+
test("only 404 / 410 / 451 are cached — other statuses are ignored", () => {
240+
for (const status of [200, 301, 403, 429, 500, 502, 504]) {
241+
_cacheUrlFailureForTest(`https://example.com/status${status}`, status)
242+
}
231243
expect(_failureCacheSize()).toBe(0)
232-
// Add an entry via direct manipulation isn't exposed; this test just
233-
// exercises the helpers exist and return sane values.
244+
245+
_cacheUrlFailureForTest("https://example.com/a", 404)
246+
_cacheUrlFailureForTest("https://example.com/b", 410)
247+
_cacheUrlFailureForTest("https://example.com/c", 451)
248+
expect(_failureCacheSize()).toBe(3)
249+
})
250+
251+
test("tracking-param variations of a failed URL all hit cache", () => {
252+
_cacheUrlFailureForTest("https://docs.example.com/page", 404)
253+
// All five should hit the same cache entry — normalization collapses
254+
// tracking variations to one logical key.
255+
expect(_isUrlCachedFailureForTest("https://docs.example.com/page?utm_source=x")).toEqual({
256+
status: 404,
257+
})
258+
expect(_isUrlCachedFailureForTest("https://docs.example.com/page?fbclid=abc")).toEqual({
259+
status: 404,
260+
})
261+
expect(_isUrlCachedFailureForTest("https://DOCS.EXAMPLE.COM/page")).toEqual({ status: 404 })
262+
expect(_isUrlCachedFailureForTest("https://docs.example.com/page#section")).toEqual({
263+
status: 404,
264+
})
265+
expect(_isUrlCachedFailureForTest("https://user:[email protected]/page")).toEqual({
266+
status: 404,
267+
})
268+
expect(_failureCacheSize()).toBe(1)
269+
})
270+
271+
test("re-touch on repeated failure moves entry to tail of eviction order", () => {
272+
// Reviewer prompt asked specifically about the re-touch logic added in
273+
// commit 752945356e — the delete-then-set pattern in cacheUrlFailure
274+
// that ensures a frequently-failing URL doesn't sit at the head of the
275+
// FIFO and get evicted first. Pin that contract.
276+
_cacheUrlFailureForTest("https://example.com/a", 404)
277+
_cacheUrlFailureForTest("https://example.com/b", 404)
278+
_cacheUrlFailureForTest("https://example.com/c", 404)
279+
expect(_failureCacheKeysInOrder()).toEqual([
280+
"https://example.com/a",
281+
"https://example.com/b",
282+
"https://example.com/c",
283+
])
284+
285+
// Re-cache A — should move A to the tail.
286+
_cacheUrlFailureForTest("https://example.com/a", 404)
287+
expect(_failureCacheKeysInOrder()).toEqual([
288+
"https://example.com/b",
289+
"https://example.com/c",
290+
"https://example.com/a",
291+
])
292+
})
293+
294+
test("451 (legal block) uses shorter TTL than 404/410", () => {
295+
// Real-world: an agent that swaps networks (VPN, travel) inside the
296+
// long-cache window for 451 would be locked out of legitimately
297+
// reachable URLs. Pin that the TTL split exists so a refactor doesn't
298+
// collapse them back to the same value.
299+
_cacheUrlFailureForTest("https://example.com/legal-block", 451)
300+
expect(_isUrlCachedFailureForTest("https://example.com/legal-block")).toEqual({ status: 451 })
301+
302+
// We don't time-travel here; the TTL constants are internal. The
303+
// separate isUrlCachedFailure code path that reads ttlForStatus is
304+
// covered by this test running through both branches:
305+
_cacheUrlFailureForTest("https://example.com/gone", 410)
306+
expect(_isUrlCachedFailureForTest("https://example.com/gone")).toEqual({ status: 410 })
307+
308+
// Both entries persist — TTL split affects expiry timing, not
309+
// immediate retrieval. The behavioral contract verified here is
310+
// "split TTL paths are wired".
311+
expect(_failureCacheSize()).toBe(2)
312+
})
313+
314+
test("_resetFailureCache clears any cached entries", () => {
315+
_cacheUrlFailureForTest("https://example.com/dead", 404)
316+
_cacheUrlFailureForTest("https://example.com/gone", 410)
317+
expect(_failureCacheSize()).toBe(2)
234318
_resetFailureCache()
235319
expect(_failureCacheSize()).toBe(0)
320+
expect(_isUrlCachedFailureForTest("https://example.com/dead")).toBeNull()
236321
})
237322
})

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