feat(providers): park a key until the reset instant the upstream declared - #4733
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drafts: true📝 WalkthroughWalkthroughThe change extracts bounded quota-reset timestamps from 429 response bodies and uses valid values for key cooldowns. Reset-based cooldowns take precedence over ChangesQuota reset failover
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~30 minutes Change: Feature · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant Upstream
participant prepareAdapterExchange
participant rotateProviderTransportOn429
participant rotateKeyOn429
participant KeyPool
Upstream->>prepareAdapterExchange: 429 response with reset timestamp
prepareAdapterExchange->>prepareAdapterExchange: readQuotaResetAt
prepareAdapterExchange->>rotateProviderTransportOn429: quotaResetAt
rotateProviderTransportOn429->>rotateKeyOn429: quotaResetAt
rotateKeyOn429->>KeyPool: apply reset-based cooldown
Merge Risk: 🟡 Moderate · up to Non-OpenRouter rate-limit responses can park a healthy key for up to 32 days based on unrelated body text, unnecessarily reducing failover capacity. Restrict this behavior before merging. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Linked Issues checkExplanation The PR satisfies the key-level objective in Resolution Add quota-exhausted target state to the combo failover path. When ✨ Finishing Touches🧪 Generate unit tests (beta)
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리뷰 · 우선순위 73 / 80이 PR(작성자 abhisheksharma2411, draft, base 고치는 방법은 세 조각이다. (1) 32일 상한 선택은 이슈 본문이 제안한 ‘대략 7일·설정 가능’보다 길다. 이유는 파싱 문구가 테스트 라인 66 - 메인테이너의 판단이 필요한 지점
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In `@src/providers/key-failover.ts`:
- Line 66: Update readQuotaResetAt in key-failover.ts to read at most 4,096
bytes from the cloned response’s ReadableStream reader, enforce a short
deadline, and cancel the reader in finally so rotation cannot remain pending on
an unclosed body. Preserve parsing of timestamps contained in the initial chunk,
and add a regression test covering a body that never closes after providing a
reset timestamp.
- Line 102: Update parseQuotaResetAt to validate the parsed date’s calendar
month/day combination, including leap-year rules, before calling Date.parse;
reject invalid dates such as 2026-02-29 and 2026-02-30 rather than allowing
JavaScript normalization. Add invalid-input coverage for both cases while
preserving valid reset-date handling.
In `@src/server/responses/adapter-dispatch.ts`:
- Line 652: Add a focused adapter-dispatch regression test near the server
key-failover end-to-end tests that sends a two-key 429 response containing both
a body-derived reset time and a shorter Retry-After value. Assert that the
failed key remains unavailable through the body-derived cooldown, covering
quotaResetAt propagation from adapter-dispatch through
rotateProviderTransportOn429 and preserving the body-reset precedence in key
failover.
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src/providers/key-failover.tssrc/server/responses/adapter-dispatch.tstests/providers/openrouter-quota-reset-cooldown-4024.test.ts
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Review follow-up from @lidge-jun on lidge-jun#4733: readQuotaResetAt called .text() on a clone and sliced 4KB afterwards, so the parse was bounded and the read was not. The PR claimed a bounded prefix; that was wrong. Fixing it surfaced something worse than the unbounded read. clone() tees the body, and the caller leaves the original branch undrained while this runs — so the tee stalls once its buffer fills. A 5MB error body hangs the rotation path outright. Reproduced: the first bounded version still timed out at 5s against a finite 5MB stream. So it no longer clones. It pulls a bounded prefix from the original and returns a Response that replays those bytes ahead of the remainder, which the caller can read or cancel exactly as before. The signature is now { at, response } and adapter-dispatch rebinds upstreamResponse — the response is still needed on the !rotated path, so consuming it outright was not an option either. New test counts bytes actually PULLED, not bytes parsed: the two were different before, which is the whole point.
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You were right to hold this, and the You were right that the read was unbounded. Fixing it exposed a hang. My first fix pulled a bounded prefix from It no longer clones. It pulls a bounded prefix from the original and returns a readQuotaResetAt(response) -> { at, response }
The new test counts bytes pulled, not bytes parsed. That distinction is the whole bug: it passes against a 5 MB body having read under 64 KB, and the old On your other four points:
Leaving it draft as you recommended. Verification at this head: 13 pass / 0 fail on the feature suite, 105 pass / 0 fail across the five suites importing I have not narrowed the regex toward OpenRouter's exact wording yet — that was your other suggestion and I'd like to check it against a real 429 body first rather than guess at the phrasing. If @Ingwannu or anyone has one to hand, that'd settle it. |
Review follow-up from @lidge-jun on lidge-jun#4733: readQuotaResetAt called .text() on a clone and sliced 4KB afterwards, so the parse was bounded and the read was not. The PR claimed a bounded prefix; that was wrong. Fixing it surfaced something worse than the unbounded read. clone() tees the body, and the caller leaves the original branch undrained while this runs — so the tee stalls once its buffer fills. A 5MB error body hangs the rotation path outright. Reproduced: the first bounded version still timed out at 5s against a finite 5MB stream. So it no longer clones. It pulls a bounded prefix from the original and returns a Response that replays those bytes ahead of the remainder, which the caller can read or cancel exactly as before. The signature is now { at, response } and adapter-dispatch rebinds upstreamResponse — the response is still needed on the !rotated path, so consuming it outright was not an option either. New test counts bytes actually PULLED, not bytes parsed: the two were different before, which is the whole point.
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Review follow-up from @lidge-jun on lidge-jun#4733: readQuotaResetAt called .text() on a clone and sliced 4KB afterwards, so the parse was bounded and the read was not. The PR claimed a bounded prefix; that was wrong. Fixing it surfaced something worse than the unbounded read. clone() tees the body, and the caller leaves the original branch undrained while this runs — so the tee stalls once its buffer fills. A 5MB error body hangs the rotation path outright. Reproduced: the first bounded version still timed out at 5s against a finite 5MB stream. So it no longer clones. It pulls a bounded prefix from the original and returns a Response that replays those bytes ahead of the remainder, which the caller can read or cancel exactly as before. The signature is now { at, response } and adapter-dispatch rebinds upstreamResponse — the response is still needed on the !rotated path, so consuming it outright was not an option either. New test counts bytes actually PULLED, not bytes parsed: the two were different before, which is the whole point.
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Rebased onto 1. Bounded 429-body read — fixed earlier ( 2. Calendar-invalid dates — correct, and worse than "minor" on Bun. I checked before fixing: Only the month is rejected. So a malformed body parked the key past the instant it actually named — bounded by the 32-day cap, but still wrong. Validated on the date text, not by round-tripping the parsed instant: a value carrying an explicit offset ( 3. No dispatch-path coverage — correct, and the gap was real. Added to I mutation-tested it against exactly the two regressions you described, and both are caught:
On "all CI tests are green" — worth stating plainly rather than just ticking. Targeted suites are Worth knowing separately: the 100-failure count you'd see running these suites without |
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Inline comments:
In `@src/providers/key-failover.ts`:
- Line 154: Restrict readQuotaResetAt and its reset-date matching to confirmed
OpenRouter quota-exhaustion responses, using the existing provider capability or
canonical response signature; unrelated providers must not produce quotaResetAt
from generic “reset(s) at” text. Preserve Retry-After handling in
rotateKeyAfterFailure when the OpenRouter condition is not met.
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src/providers/key-failover.tssrc/server/responses/adapter-dispatch.tstests/providers/openrouter-quota-reset-cooldown-4024.test.tstests/server/server-key-failover-e2e.test.ts
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| const text = body?.slice(0, QUOTA_RESET_SCAN_BYTES); | ||
| if (!text) return undefined; | ||
| // `will reset at 2026-09-09 03:30:06` / `... at 2026-09-09T03:30:06Z` / `resets at <date>` | ||
| const match = /reset[s]?\s+at\s+([0-9]{4}-[0-9]{2}-[0-9]{2}(?:[T ][0-9]{2}:[0-9]{2}(?::[0-9]{2})?(?:\.[0-9]+)?(?:Z|[+-][0-9]{2}:?[0-9]{2})?)?)/i.exec(text); |
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🩺 Stability & Availability | 🟠 Major | ⚡ Quick win
Restrict quota-reset parsing to OpenRouter quota responses.
src/server/responses/adapter-dispatch.ts:642-656 calls readQuotaResetAt for any non-OAuth provider with at least two apiKeyPool entries. src/providers/key-failover.ts:154 accepts any reset at or resets at phrase. rotateKeyAfterFailure gives quotaResetAt precedence over Retry-After, so an unrelated provider response can park the failed key for up to 32 days.
Require the OpenRouter quota-exhaustion signature, or add a canonical provider capability gate. Replace the broad "quota resets at" test with a non-OpenRouter negative case.
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In `@src/providers/key-failover.ts` at line 154, Restrict readQuotaResetAt and its
reset-date matching to confirmed OpenRouter quota-exhaustion responses, using
the existing provider capability or canonical response signature; unrelated
providers must not produce quotaResetAt from generic “reset(s) at” text.
Preserve Retry-After handling in rotateKeyAfterFailure when the OpenRouter
condition is not met.
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Review follow-up from @lidge-jun on lidge-jun#4733: readQuotaResetAt called .text() on a clone and sliced 4KB afterwards, so the parse was bounded and the read was not. The PR claimed a bounded prefix; that was wrong. Fixing it surfaced something worse than the unbounded read. clone() tees the body, and the caller leaves the original branch undrained while this runs — so the tee stalls once its buffer fills. A 5MB error body hangs the rotation path outright. Reproduced: the first bounded version still timed out at 5s against a finite 5MB stream. So it no longer clones. It pulls a bounded prefix from the original and returns a Response that replays those bytes ahead of the remainder, which the caller can read or cancel exactly as before. The signature is now { at, response } and adapter-dispatch rebinds upstreamResponse — the response is still needed on the !rotated path, so consuming it outright was not an option either. New test counts bytes actually PULLED, not bytes parsed: the two were different before, which is the whole point.
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…ared A free-tier quota exhaustion is dated by the upstream, but OpenRouter puts that date in the 429 BODY and sends no Retry-After. parseRetryAfterMs only reads the header, so the key was parked for DEFAULT_COOLDOWN_MS, came back, took another 429, and repeated for the rest of the quota window. parseQuotaResetAt reads `... will reset at <date>` out of a bounded 4KB prefix; readQuotaResetAt pulls it off a cloned response so the caller can still cancel the original to release the socket. When present it outranks both the header and the default, because it is the only one of the three that knows when the quota actually returns. MAX_QUOTA_COOLDOWN_MS is 32 days, separate from the 10-minute cap on undated 429s. That cap stays short on purpose: an undated 429 is a guess. A dated one is not. 32 rather than 8 days because the wording parsed is "Weekly/Monthly Limit Exhausted" — an 8-day cap silently clamped every monthly reset ~23 days early, back into the loop this removes. Caught by the cap's own test. Anything unreadable returns undefined and leaves today's behaviour exactly as it was: no body, consumed body, no match, unparsable date, a date already past, or one past the cap. Closes lidge-jun#4024
Review follow-up from @lidge-jun on lidge-jun#4733: readQuotaResetAt called .text() on a clone and sliced 4KB afterwards, so the parse was bounded and the read was not. The PR claimed a bounded prefix; that was wrong. Fixing it surfaced something worse than the unbounded read. clone() tees the body, and the caller leaves the original branch undrained while this runs — so the tee stalls once its buffer fills. A 5MB error body hangs the rotation path outright. Reproduced: the first bounded version still timed out at 5s against a finite 5MB stream. So it no longer clones. It pulls a bounded prefix from the original and returns a Response that replays those bytes ahead of the remainder, which the caller can read or cancel exactly as before. The signature is now { at, response } and adapter-dispatch rebinds upstreamResponse — the response is still needed on the !rotated path, so consuming it outright was not an option either. New test counts bytes actually PULLED, not bytes parsed: the two were different before, which is the whole point.
…in the dispatch path Two CodeRabbit findings. `Date.parse` does not reject an out-of-range day. Measured on Bun, `2026-02-30T00:00:00Z` yields March 2 and `2026-04-31T00:00:00Z` yields May 1, so a malformed upstream body parked a key past the instant it actually named. Only the month was caught (`2026-13-01` is NaN). Validated on the date text rather than by round-tripping the parsed instant, because a value carrying an explicit offset legitimately lands on a different UTC day than the one written. Century leap rule included: 2000 is a leap year, 2100 is not. The other finding is that nothing exercised the wiring. The unit tests covered parseQuotaResetAt and readQuotaResetAt in isolation, so a change that dropped quotaResetAt before rotateProviderTransportOn429, or flipped the precedence against Retry-After, kept every test green while the key came back after the header's 30s and took the same 429 again. Added an end-to-end test that serves a 429 carrying both a Retry-After and a body date and asserts the failed key is parked to the body's instant. Co-authored-by: Abhishek Sharma <abhicse24@gmail.com>
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Thanks for the rebase — left it alone rather than force-pushing over it. Answering the open points, several of which are already done since that review was written against tip Bounded read — done. Checklist / draft — done. All four boxes ticked and out of draft, each literally true at the time: targeted suites Worth recording, because it invalidates test numbers in earlier comments on this PR: the full local suite shows Cooldowns are process memory — you're right, and it matters more now. A 32-day park in 32 days vs the issue's "~7 days, configurable": 32 is deliberate — it's the smallest cap that survives a monthly reset window, and an 8-day cap silently clamped a real monthly reset ~23 days early (its own test caught that). No objection to a config knob, but I'd rather the default not truncate a window the upstream actually declared. Scope calls are yours, and I'd only note a preference on the last: splitting #4024 into "keys landed / combo targets open" seems right to me, since the key path is verifiable from the 429 body alone while the combo-target path needs the routing decision. Regex narrowing: happy to tighten toward OpenRouter's exact phrasing if you want, though note it currently also accepts the |
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Reviewed against current head a137d4c33ae267693fc4be7d3a8b72f0763924b9. The old response-clone finding is closed. The current implementation reads the original stream and reconstructs a response with the original status, status text, and headers (src/providers/key-failover.ts:63-107), replays already-pulled bytes, and streams the remainder lazily instead of buffering the whole body.
Four issues remain; the last two are merge blockers.
-
The 4 KiB read ceiling is not actually enforced.
src/providers/key-failover.ts:74-80appends the entire chunk and checks the limit only before the next read. A single multi-megabyte chunk is therefore retained and decoded in full. The test attests/providers/openrouter-quota-reset-cooldown-4024.test.ts:125-146uses 64 KiB chunks and only asserts that less than 1.25 MiB was pulled, so it passes while exceeding the documented 4,096-byte ceiling by at least 16x. Slice the boundary chunk at the remaining byte budget and replay its overflow before the unread remainder, then assert an exact<= 4_096pull/retention contract with a chunk larger than the cap. -
reader.read()atsrc/providers/key-failover.ts:75has no deadline and receives no abort signal. A body that stalls before reaching the ceiling blocks the rotation path indefinitely. Thread the request abort signal into this helper and bound the peek with a short deadline; cancellation or timeout must terminate the read and preserve a usable response/error path rather than leaving the failover loop pending. -
MERGE BLOCKER: the blanket catch at
src/providers/key-failover.ts:108-110returns the original response while the reader created at line 69 still owns the stream lock. The caller therefore does not receive a usable response on that path. More seriously, if a fetch-backed read rejects because the client aborted, that catch converts cancellation into an ordinary “no body date” result;src/server/responses/adapter-dispatch.ts:676-689then continues into rotation, records cooldown, and persists a replacement key for a request the client cancelled. The reader is neither cancelled nor released. Distinguish abort from parse/read failure, propagate cancellation to the dispatch path, and usefinallyto cancel or release the reader so an error cannot return a locked body or mutate key state after client cancellation. -
MERGE BLOCKER:
parseQuotaResetAtis a broad regex over arbitrary response prose (src/providers/key-failover.ts:150-176), andadapter-dispatchinvokes it for every 429 from every provider with a multi-key pool (src/server/responses/adapter-dispatch.ts:667-685; pool eligibility is only the generic 2+ key check atsrc/providers/key-failover.ts:245-252). Nothing confirms OpenRouter or itsrate_limit_errorquota-exhaustion envelope. An unrelated provider's generic 429 containing “resets at ” can therefore override a validRetry-Afterand park a working key for up to 32 days. Gate body-date parsing on the canonical OpenRouter provider/capability and a validated OpenRouter quota error shape, leavingRetry-Afterauthoritative for unrelated upstream prose.
Please also remove Closes #4024 and keep #4024 open. This head adds reset-aware key parking to one Responses dispatch path for a multi-key pool. It does not implement single-key-to-combo failover, combo-target exhaustion, the other OpenRouter surfaces, configurable policy, or parking that survives restart. The cooldown map is process-local (src/providers/key-failover.ts:200-205), and pools with fewer than two keys return before recording any cooldown (src/providers/key-failover.ts:523-526). Closing the broader issue would hide those still-open requirements.
Implements the reviewed fixes for PR #4733 while preserving the original monthly-window and UTC contracts. Co-authored-by: Abhishek Sharma <abhicse24@gmail.com>
* feat(providers): park a key until the reset instant the upstream declared A free-tier quota exhaustion is dated by the upstream, but OpenRouter puts that date in the 429 BODY and sends no Retry-After. parseRetryAfterMs only reads the header, so the key was parked for DEFAULT_COOLDOWN_MS, came back, took another 429, and repeated for the rest of the quota window. parseQuotaResetAt reads `... will reset at <date>` out of a bounded 4KB prefix; readQuotaResetAt pulls it off a cloned response so the caller can still cancel the original to release the socket. When present it outranks both the header and the default, because it is the only one of the three that knows when the quota actually returns. MAX_QUOTA_COOLDOWN_MS is 32 days, separate from the 10-minute cap on undated 429s. That cap stays short on purpose: an undated 429 is a guess. A dated one is not. 32 rather than 8 days because the wording parsed is "Weekly/Monthly Limit Exhausted" — an 8-day cap silently clamped every monthly reset ~23 days early, back into the loop this removes. Caught by the cap's own test. Anything unreadable returns undefined and leaves today's behaviour exactly as it was: no body, consumed body, no match, unparsable date, a date already past, or one past the cap. Closes #4024 * fix(providers): bound the 429 body READ, and stop cloning it Review follow-up from @lidge-jun on #4733: readQuotaResetAt called .text() on a clone and sliced 4KB afterwards, so the parse was bounded and the read was not. The PR claimed a bounded prefix; that was wrong. Fixing it surfaced something worse than the unbounded read. clone() tees the body, and the caller leaves the original branch undrained while this runs — so the tee stalls once its buffer fills. A 5MB error body hangs the rotation path outright. Reproduced: the first bounded version still timed out at 5s against a finite 5MB stream. So it no longer clones. It pulls a bounded prefix from the original and returns a Response that replays those bytes ahead of the remainder, which the caller can read or cancel exactly as before. The signature is now { at, response } and adapter-dispatch rebinds upstreamResponse — the response is still needed on the !rotated path, so consuming it outright was not an option either. New test counts bytes actually PULLED, not bytes parsed: the two were different before, which is the whole point. * fix(providers): refuse a reset date the calendar does not have, and pin the dispatch path Two CodeRabbit findings. `Date.parse` does not reject an out-of-range day. Measured on Bun, `2026-02-30T00:00:00Z` yields March 2 and `2026-04-31T00:00:00Z` yields May 1, so a malformed upstream body parked a key past the instant it actually named. Only the month was caught (`2026-13-01` is NaN). Validated on the date text rather than by round-tripping the parsed instant, because a value carrying an explicit offset legitimately lands on a different UTC day than the one written. Century leap rule included: 2000 is a leap year, 2100 is not. The other finding is that nothing exercised the wiring. The unit tests covered parseQuotaResetAt and readQuotaResetAt in isolation, so a change that dropped quotaResetAt before rotateProviderTransportOn429, or flipped the precedence against Retry-After, kept every test green while the key came back after the header's 30s and took the same 429 again. Added an end-to-end test that serves a 429 carrying both a Retry-After and a body date and asserts the failed key is parked to the body's instant. Co-authored-by: Abhishek Sharma <abhicse24@gmail.com> * fix(providers): harden dated quota cooldown parsing Implements the reviewed fixes for PR #4733 while preserving the original monthly-window and UTC contracts. Co-authored-by: Abhishek Sharma <abhicse24@gmail.com> --------- Co-authored-by: Abhishek Sharma <abhicse24@gmail.com>
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Landed on Closing this one because the work is on If you disagree with any part of the change made on top of your work, say so on #4980 and it can be revisited. Thanks for the contribution. |
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Closes #4024.
Summary
A free-tier quota exhaustion is dated — OpenRouter replies
Weekly/Monthly Limit Exhausted ... will reset at <date>. But it puts that date in the body, and sends noRetry-After.parseRetryAfterMsonly reads the header, so the key falls back toDEFAULT_COOLDOWN_MS, returns after a minute, takes another 429, rotates again — every minute, for the rest of the quota window. @Ingwannu confirmed the same reading ofkey-failover.tsondev@29bb221c3.parseQuotaResetAt(body)— pullsreset[s] at <date>from a bounded 4 KB prefix.readQuotaResetAt(response)— reads it off a cloned response, so the caller can stillbody.cancel()to release the socket, whichadapter-dispatch.tsdoes on the next line.The cap, and why it is not the existing one
MAX_COOLDOWN_MSstays 10 minutes. That shortness is correct for an undated 429 — it's a guess, and a guess shouldn't park a working key for long. A dated one isn't a guess, so it gets its own ceiling:MAX_QUOTA_COOLDOWN_MS = 32 days.I had that wrong at first and the test caught it. I wrote 8 days, reasoning about the weekly case in the issue. But the wording being parsed is
Weekly/**Monthly** Limit Exhausted, and an 8-day cap silently clamps every monthly reset ~23 days early — straight back into the loop this exists to remove. 31 days plus a day of slack for month length and zone.Bounded at all because the date is upstream-controlled input:
reset at 2999-01-01must not park a working key past any horizon an operator would think to look at.A runtime divergence worth knowing about
The parser pins a bare
YYYY-MM-DD hh:mm:ssto UTC explicitly. That looks redundant on this runtime, and I want to be straight about why it isn't:ECMA-262 says a date-time form with no offset is local; Node follows it, Bun currently doesn't. So on Bun the normalisation is a no-op today — and if Bun ever conforms, an un-normalised parse would shift every park-until by the operator's offset, with the early direction resuming the 429 tax.
The honest consequence: no Bun test can observe that branch being removed. I mutated it away and the suite stayed green. The explicit-zone case (
+05:30) is the part the suite can pin, and it does. Flagging rather than claiming coverage I don't have.Verification
Typecheck failures are
src/server/responses/fetch-helpers.ts(195,7)and(208,7),'timeout' does not exist in type 'RequestInit'— same two as on untoucheddev.Mutation-tested:
Scope
Wired into
adapter-dispatch.ts, the main rotation path. The otherrotateProviderTransportOn429call sites (chat-native,adapter-continuation,encrypted-payload,compact) pass nothing and keep exactly today's behaviour — the option is optional, so this is additive. Happy to thread the rest in this PR or a follow-up; I stopped at one path rather than touch five hot sites in a change that needs live-traffic confirmation anyway.The issue's second half — reset-aware combo target parking, as opposed to key parking — is not here. That's a different mechanism and @Ingwannu's note about rotation persisting the replacement key suggests it wants its own discussion.
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