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fix: honor runtime-lowered concurrency limit + cancel queued waiters on disconnect
Fixes three findings from an independent concurrency audit of the -p/stream-json wait-queue (lib/tui/semaphore.mjs, reused by server.mjs as `claudeSemaphore`) and its acquireClaudeSlot()/callClaudeTui() callers in server.mjs: F1 (MEDIUM) — release() handed a freed slot straight to the next queued waiter without re-checking `this.limit`, so a PATCH /settings maxConcurrent decrease was silently ignored until every already-inflight task happened to finish on its own. release() now only re-grants when post-decrement inflight is still under the current limit, and a new setLimit() wakes queued waiters immediately when the limit is raised instead of only on the next incidental release(). F2 (MEDIUM) — a request queued behind the concurrency limit had no link to its HTTP connection, so a client that disconnected while still queued would still get a claude process spawned for it once a slot freed — burning subscription quota for a dead socket. acquire() now accepts an optional AbortSignal; server.mjs derives one from the client's res "close" event (closeSignalFor) and passes it into claudeSemaphore.acquire() / tuiSemaphore.acquire() while queued. On abort the waiter is spliced out of the queue (not just flagged), so `queued` accounting stays exact; the same "close" signal is wired into acquireClaudeSlot() (-p path, non-streaming + streaming + singleflight-wrapped) and callClaudeTui() (TUI path). If the response is already destroyed by the time we try to queue, we reject immediately without ever entering the queue. F8 (cosmetic) — acquireClaudeSlot() set `stats.queued = claudeSemaphore.queued + 1` BEFORE calling acquire(), over-reporting /health's queued count by 1 whenever a slot was granted immediately (the common, non-queued case). acquire() already updates its internal queue synchronously before returning a Promise, so reading claudeSemaphore.queued right AFTER calling it (instead of guessing "+1" before) is exact. No /health field was added, removed, or renamed. ALIGNMENT.md: this PR touches request-handler code (callClaude, callClaudeStreaming, callClaudeTui, acquireClaudeSlot) but is local concurrency-control/queue-accounting infrastructure with no cli.js wire analogue — it does not add, rename, or change any endpoint, header, request field, or response field, and does not touch the /v1/messages forwarding path or the OAuth bearer machinery (the two Class A surfaces this repo governs). The /health response shape is unchanged (same field set, same nesting; only the *value* of the pre-existing `stats.queued` field is corrected). Per CLAUDE.md hard-requirement #1, a cli.js citation is therefore declared ABSENT: there is no corresponding cli.js operation to cite because this is not a cli.js-mirror (Class A) change and not a Class B endpoint-contract change either. Tests: added 6 unit tests to test-features.mjs against the shared TuiSemaphore (lowering the limit mid-load does not over-admit; raising the limit wakes queued waiters up to the new headroom, FIFO; a queued waiter cancelled via AbortSignal is spliced out and never later acquires; an already-aborted signal never touches the queue; cancelling one of several queued waiters preserves FIFO for the rest). 238 pre-existing tests remain green; suite is now 244/244. Verification: `node --check server.mjs && node --check lib/tui/semaphore.mjs && npm test` — 244 passed, 0 failed. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Claude Fable 5
+185
-1
@@ -2005,7 +2005,7 @@ test("resolveTuiHome: explicit OCP_TUI_HOME wins regardless of env token (back-c
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});
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// ── TUI concurrency limiter + drift observability (PR-B: audit C-4 / C-5) ──
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import { TuiSemaphore, recordTuiEntrypoint, buildTuiHealthBlock } from "./lib/tui/semaphore.mjs";
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import { TuiSemaphore, SemaphoreAbortError, recordTuiEntrypoint, buildTuiHealthBlock } from "./lib/tui/semaphore.mjs";
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console.log("\nTUI concurrency limiter (C-4):");
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@@ -2110,6 +2110,190 @@ await asyncTest("FIX ⑥: slot released on normal completion is immediately reus
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assert.equal(sem.inflight, 0);
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});
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// ── Audit F1 — runtime-lowered/raised limit must actually bite ──────────────
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// server.mjs reuses this same TuiSemaphore as `claudeSemaphore`; a PATCH /settings
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// maxConcurrent update now calls `claudeSemaphore.setLimit(value)` (see applySettingUpdate's
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// "maxConcurrent" case). These tests pin the semaphore-level contract that fix depends on.
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console.log("\nF1 — runtime concurrency-limit changes (setLimit / release honoring the current limit):");
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await asyncTest("F1: lowering the limit mid-load — release() stops re-granting until inflight drains under the new limit", async () => {
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const sem = new TuiSemaphore(3, { maxQueue: 16 });
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const g = [deferred(), deferred(), deferred()];
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const held = g.map((d) => sem.run(async () => { await d.p; }));
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await new Promise((r) => setImmediate(r));
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assert.equal(sem.inflight, 3, "3 tasks hold the 3 slots");
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// A 4th arrives while at capacity — it queues.
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const g4 = deferred();
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const queued4 = sem.run(async () => { await g4.p; });
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await new Promise((r) => setImmediate(r));
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assert.equal(sem.queued, 1, "4th request queued");
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// Operator lowers maxConcurrent from 3 to 1 while all 3 original slots are still inflight
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// (mirrors a PATCH /settings maxConcurrent=1 hitting server.mjs mid-burst).
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sem.setLimit(1);
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assert.equal(sem.limit, 1);
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// Releasing one of the 3 original holders must NOT hand the freed slot to the queued 4th
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// request — before the F1 fix, release() handed slots off unconditionally, so inflight
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// would have stayed pinned at the OLD higher occupancy forever.
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g[0].resolve();
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await held[0];
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await new Promise((r) => setImmediate(r));
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assert.equal(sem.inflight, 2, "inflight drains toward the new limit, not re-granted");
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assert.equal(sem.queued, 1, "4th request is STILL queued — not over-admitted");
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g[1].resolve();
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await held[1];
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await new Promise((r) => setImmediate(r));
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assert.equal(sem.inflight, 1, "inflight now exactly at the new limit (1)");
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assert.equal(sem.queued, 1, "still queued — inflight(1) is not < limit(1), so no grant yet");
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// Releasing the LAST original holder finally drops inflight under the new limit — only
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// now does the queued 4th request get granted.
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g[2].resolve();
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await held[2];
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await new Promise((r) => setImmediate(r));
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assert.equal(sem.inflight, 1, "queued 4th request now holds the single slot");
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assert.equal(sem.queued, 0, "queue drained");
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g4.resolve();
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await queued4;
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assert.equal(sem.inflight, 0);
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});
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await asyncTest("F1: raising the limit wakes queued waiters immediately, up to the new headroom", async () => {
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const sem = new TuiSemaphore(1, { maxQueue: 16 });
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const g1 = deferred();
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const t1 = sem.run(async () => { await g1.p; }); // holds the only slot
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await new Promise((r) => setImmediate(r));
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const started = [];
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const g2 = deferred(), g3 = deferred();
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const t2 = sem.run(async () => { started.push(2); await g2.p; });
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const t3 = sem.run(async () => { started.push(3); await g3.p; });
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await new Promise((r) => setImmediate(r));
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assert.equal(sem.queued, 2, "both queue behind the single holder");
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assert.deepEqual(started, [], "neither queued task has started");
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// Operator raises maxConcurrent from 1 to 3 (2 units of new headroom) — BOTH queued
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// waiters must be woken immediately, without waiting for t1 to release.
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sem.setLimit(3);
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await new Promise((r) => setImmediate(r));
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assert.equal(sem.inflight, 3, "t1 + both newly-woken waiters now hold slots");
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assert.equal(sem.queued, 0, "queue drained by the limit raise");
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assert.deepEqual(started.sort(), [2, 3], "both queued tasks started without waiting for t1's release");
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g1.resolve(); g2.resolve(); g3.resolve();
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await Promise.all([t1, t2, t3]);
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assert.equal(sem.inflight, 0);
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});
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await asyncTest("F1: raising the limit wakes only as many waiters as the new headroom allows (FIFO)", async () => {
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const sem = new TuiSemaphore(1, { maxQueue: 16 });
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const g1 = deferred();
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const t1 = sem.run(async () => { await g1.p; });
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await new Promise((r) => setImmediate(r));
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const started = [];
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const g2 = deferred(), g3 = deferred();
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const t2 = sem.run(async () => { started.push(2); await g2.p; });
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const t3 = sem.run(async () => { started.push(3); await g3.p; });
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await new Promise((r) => setImmediate(r));
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assert.equal(sem.queued, 2);
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sem.setLimit(2); // only 1 unit of new headroom (1 -> 2) — exactly one queued waiter wakes
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await new Promise((r) => setImmediate(r));
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assert.equal(sem.inflight, 2);
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assert.equal(sem.queued, 1, "one waiter still queued — only one slot of headroom existed");
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assert.deepEqual(started, [2], "FIFO: the earlier-queued waiter (t2) wakes, not t3");
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// Freeing t1's slot afterward still honors the (now current) limit of 2 via release()'s
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// normal path — the still-queued t3 gets in once a slot actually frees.
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g1.resolve();
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await t1;
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await new Promise((r) => setImmediate(r));
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assert.deepEqual(started, [2, 3], "t3 granted once a slot frees, honoring the raised limit");
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assert.equal(sem.queued, 0);
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g2.resolve(); g3.resolve();
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await t2; await t3;
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assert.equal(sem.inflight, 0);
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});
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// ── Audit F2 — queued waiters must be cancellable on client disconnect ──────
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// server.mjs wires an AbortSignal derived from the client's res "close" event into
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// claudeSemaphore.acquire()/tuiSemaphore.acquire() (see closeSignalFor + acquireClaudeSlot /
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// callClaudeTui). These tests pin the semaphore-level cancellation contract that depends on.
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console.log("\nF2 — queued-wait cancellation via AbortSignal (client disconnect while queued):");
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await asyncTest("F2: aborting a QUEUED waiter rejects with SemaphoreAbortError and SPLICES it out (queued drops immediately, not just flagged)", async () => {
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const sem = new TuiSemaphore(1, { maxQueue: 16 });
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const g1 = deferred();
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const t1 = sem.run(async () => { await g1.p; }); // holds the only slot
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await new Promise((r) => setImmediate(r));
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const controller = new AbortController();
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const acquire2 = sem.acquire(controller.signal); // queues behind t1
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await new Promise((r) => setImmediate(r));
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assert.equal(sem.queued, 1, "second acquire queued");
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controller.abort(); // simulates the client disconnecting while still queued
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await assert.rejects(acquire2, SemaphoreAbortError, "cancelled waiter rejects with SemaphoreAbortError");
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assert.equal(sem.queued, 0, "cancelled waiter is REMOVED — queue length drops immediately");
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assert.equal(sem.inflight, 1, "t1's slot is untouched by the cancellation");
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// Prove the cancelled waiter never later acquires a slot: free t1's slot and confirm
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// nobody is waiting to receive it (the queue is genuinely empty, not just decremented).
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g1.resolve();
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await t1;
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assert.equal(sem.inflight, 0, "slot freed with nobody queued — the cancelled waiter never got it");
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});
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await asyncTest("F2: an already-aborted signal rejects acquire() immediately, never touching the wait queue", async () => {
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const sem = new TuiSemaphore(1, { maxQueue: 16 });
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const g1 = deferred();
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const t1 = sem.run(async () => { await g1.p; }); // holds the only slot
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await new Promise((r) => setImmediate(r));
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const controller = new AbortController();
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controller.abort(); // client already gone before this request ever tries to acquire
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await assert.rejects(sem.acquire(controller.signal), SemaphoreAbortError);
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assert.equal(sem.queued, 0, "never entered the wait queue at all");
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g1.resolve(); await t1;
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});
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await asyncTest("F2: cancelling one queued waiter preserves FIFO order for the others", async () => {
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const sem = new TuiSemaphore(1, { maxQueue: 16 });
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const g1 = deferred();
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const t1 = sem.run(async () => { await g1.p; });
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await new Promise((r) => setImmediate(r));
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const started = [];
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const cA = new AbortController();
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const cB = new AbortController();
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const accA = sem.acquire(cA.signal).then(() => started.push("A"));
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const accB = sem.acquire(cB.signal).then(() => started.push("B"));
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const g3 = deferred();
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const t3 = sem.run(async () => { started.push("C"); await g3.p; });
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await new Promise((r) => setImmediate(r));
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assert.equal(sem.queued, 3, "A, B, C all queued behind t1");
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cB.abort(); // B (the middle waiter) disconnects
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await assert.rejects(accB, SemaphoreAbortError);
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assert.equal(sem.queued, 2, "B removed; A and C remain, in original relative order");
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g1.resolve();
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await t1;
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await new Promise((r) => setImmediate(r));
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assert.deepEqual(started, ["A"], "A (queued first, still present) is granted next — FIFO preserved after B's removal");
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assert.equal(sem.inflight, 1);
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assert.equal(sem.queued, 1, "C still waiting");
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sem.release(); // A was acquired directly (not via run()) — free its slot manually
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await new Promise((r) => setImmediate(r));
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assert.deepEqual(started, ["A", "C"], "C granted next");
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g3.resolve();
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await t3;
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assert.equal(sem.inflight, 0);
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});
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console.log("\nTUI drift observability (C-5):");
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test("recordTuiEntrypoint: observed 'cli' is NOT a mismatch and sets lastEntrypoint", () => {
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