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test(oauth): prove the unobservable quorum staleness window is harmless #3533

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lidge-jun merged 1 commit into from
Sep 4, 2026
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test(oauth): prove the unobservable quorum staleness window is harmless #3533

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13 changes: 13 additions & 0 deletions src/oauth/anthropic-routing.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -249,6 +249,19 @@ export function getEligibleAnthropicAccounts(now = Date.now()): string[] {
* enough that a login in another window is visible before the operator can switch back and send a
* prompt, long enough that a burst of requests shares one read. The cache holds a BOOLEAN derived
* from a count — never a credential, never an account id.
*
* Staleness is bounded by consequence, not only by the TTL. Explicit invalidation covers the
* roster mutations this module can see (rotation, pool-state reset, affinity clear on account
* removal, manual selection), but not one it cannot: a 401 elsewhere flagging an account
* `needsReauth` drops the real quorum to one while a cached `true` survives for up to 2s.
*
* That window is harmless in both directions, which is why it is left rather than plumbed
* through the store. A stale `true` only lets the caller ASK for an alternate;
* `pickAlternateAnthropicAccount` re-reads the roster through `getEligibleAnthropicAccounts`,
* skips the reauth-flagged account and returns `null`, so the 429 surfaces exactly as it would
* have. A stale `false` costs one un-rotated 429 and self-corrects on the next read. Neither

@chatgpt-codex-connector chatgpt-codex-connector Bot Sep 4, 2026

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P2 Badge Account for every 429 in the stale-false window

When a second login arrives while false is cached, every request initialized before the two-second TTL expires receives that cached value at src/server/responses/core.ts:3486, leaves anthropicPoolAccountId null, and therefore skips the Anthropic rotation arms if it later receives a 429. Under a burst this can strand many requests, not just the single unrotated 429 claimed here, and the added test covers only stale true. Either invalidate the cache when an Anthropic credential is added or document and test the actual multi-request consequence rather than using this assertion to justify omitting the store hook.

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* can dispatch on an unusable credential, which is the only outcome worth adding a store hook
Comment on lines +262 to +263

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📐 Maintainability & Code Quality | 🟡 Minor | ⚡ Quick win

Correct the stale-false consequence.

A stale false can cause more than one un-rotated 429. rotateAnthropicAccountOn429 returns at its quorum gate while the cached false remains valid. It does not clear quorumCache on that path. State that rotation remains suppressed until the cache expires, which can be up to the remaining two-second TTL. Add a regression case with two 429 rotations before expiry if this behavior is intentional.

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In `@src/oauth/anthropic-routing.ts` around lines 262 - 263, Update the
documentation near rotateAnthropicAccountOn429 to state that a stale cached
false suppresses rotation until quorumCache expires, potentially for the
remaining two-second TTL, rather than implying it self-corrects on the next
read. Add a regression test covering two 429-triggered rotations before cache
expiry if this suppression behavior is intentional.

After applying the fix, consider running `coderabbit review --agent` for local
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Source: Coding guidelines

* to prevent.
*/
const QUORUM_CACHE_TTL_MS = 2_000;

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24 changes: 23 additions & 1 deletion tests/routing/anthropic-quorum-cache.test.ts
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Expand Up @@ -24,7 +24,7 @@ import {
resetAnthropicRoutingForManualSelection,
rotateAnthropicAccountOn429,
} from "../../src/oauth/anthropic-routing";
import { getAccountSet, saveCredential } from "../../src/oauth/store";
import { getAccountSet, markAccountNeedsReauth, saveCredential } from "../../src/oauth/store";
import { removeTreeWithRetry } from "../helpers/remove-tree";

const originalHome = process.env.OPENCODEX_HOME;
Expand Down Expand Up @@ -119,6 +119,28 @@ describe("Anthropic failover quorum cache", () => {
expect(typeof hasAnthropicFailoverQuorum()).toBe("boolean");
});

test("a stale quorum cannot dispatch on a reauth-flagged account", async () => {
// The one roster mutation this module cannot observe: a 401 elsewhere flags an account
// needsReauth, dropping the real quorum to one while the cached `true` survives the TTL.
//
// The window is left unplumbed deliberately, so this pins the reason: a stale `true` only
// lets the caller ASK. pickAlternateAnthropicAccount re-reads the roster, skips the flagged
// account and answers null, so the 429 surfaces exactly as it would have. If that ever
// stopped being true, the comment above the cache would be a lie and this fails.
const start = Date.now();
const ids = await seed(2);
expect(hasAnthropicFailoverQuorum(start)).toBe(true);

await markAccountNeedsReauth("anthropic", ids[1]!, true);
// Deliberately NOT invalidating: this is the stale-cache state under test.
expect(hasAnthropicFailoverQuorum(start + 1)).toBe(true);

// The rotator admits the request, then finds nothing usable and refuses.
expect(
rotateAnthropicAccountOn429({ providers: {} } as never, ids[0]!, null, null, start + 1),
).toBeNull();
});

test("removing an account invalidates immediately, not after the TTL", async () => {
// The management DELETE route calls clearAnthropicSessionAffinityForAccount for Anthropic.
// Without invalidation there, deleting the second account would leave quorum true for up to
Expand Down
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