Offload functions to worker threads with shared memory primitives for Node.js.
fix(test): eliminate race in shutdown tests
The previous 50ms setTimeout was unreliable — the worker may not have
booted and started consuming fds yet. Now:
- in-flight test: waits for HTTP response headers (worker is mid-flight)
- drainTimeout test: waits for TCP connect + 100ms grace for fd transit
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
+55
-10
+3
-3
test/channel-fanout.test.ts
+3
-3
test/channel-fanout.test.ts
···
67
67
lengths.reduce((a, b) => a + b, 0),
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68
4000,
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);
70
-
// Skip-based RR doesn't guarantee even splits under heterogeneous drain
71
-
// rates, but no consumer should receive zero items.
70
+
// Skip-based RR guarantees each consumer receives at least its initial
71
+
// high-water-mark fill (default 16) before faster consumers pull ahead.
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const min = Math.min(...lengths);
73
-
assert.ok(min > 0, `expected each consumer > 0 items, got ${lengths.join(',')}`);
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+
assert.ok(min >= 16, `expected each consumer ≥ 16 items, got ${lengths.join(',')}`);
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});
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});
+52
-7
test/serve/shutdown.test.ts
+52
-7
test/serve/shutdown.test.ts
···
19
19
});
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}
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+
function httpGetWithSignal(port: number): { body: Promise<string>; responded: Promise<void> } {
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let onResponded: () => void;
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const responded = new Promise<void>((r) => {
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+
onResponded = r;
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+
});
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+
const body = new Promise<string>((resolve, reject) => {
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+
const req = request({ host: '127.0.0.1', port, path: '/' }, (res) => {
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onResponded!();
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const chunks: Buffer[] = [];
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+
res.on('data', (c) => chunks.push(Buffer.isBuffer(c) ? c : Buffer.from(c)));
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+
res.on('end', () => resolve(Buffer.concat(chunks).toString('utf8')));
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+
});
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+
req.on('error', reject);
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+
req.end();
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+
});
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+
return { body, responded };
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+
}
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+
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+
function httpGetWithConnect(port: number): { body: Promise<string>; connected: Promise<void> } {
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+
let onConnected: () => void;
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+
const connected = new Promise<void>((r) => {
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+
onConnected = r;
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+
});
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+
const body = new Promise<string>((resolve, reject) => {
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+
const req = request({ host: '127.0.0.1', port, path: '/' }, (res) => {
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+
const chunks: Buffer[] = [];
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+
res.on('data', (c) => chunks.push(Buffer.isBuffer(c) ? c : Buffer.from(c)));
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+
res.on('end', () => resolve(Buffer.concat(chunks).toString('utf8')));
50
+
});
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+
req.on('socket', (sock) => {
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sock.on('connect', () => onConnected!());
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+
});
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req.on('error', (e) => reject(e));
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req.end();
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});
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return { body: body.catch(() => 'aborted'), connected };
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}
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+
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describe('graceful shutdown', () => {
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it('in-flight request completes before pool exits', { timeout: 15_000 }, async () => {
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const server = createNetServer();
···
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using threads = serverThreads(run.workers, server);
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const serving = run(threads.map(([w, args]) => assign(w, runSlowServer(200, ...args))));
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-
const responsePromise = httpGet(port);
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// Give the worker a moment to accept the connection.
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await new Promise((r) => setTimeout(r, 50));
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+
// Wait for the worker to actually begin handling: send the request and
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+
// wait for the response to start (headers received = worker is mid-flight).
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+
const { body, responded } = httpGetWithSignal(port);
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+
await responded;
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server.close();
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const body = await responsePromise;
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assert.equal(body, 'done');
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assert.equal(await body, 'done');
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await serving;
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}
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});
···
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const serving = run(threads.map(([w, args]) => assign(w, runSlowServer(10_000, ...args))));
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const t0 = Date.now();
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-
const responsePromise = httpGet(port).catch(() => 'aborted');
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-
await new Promise((r) => setTimeout(r, 50));
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+
// Use httpGetWithSignal — the slow server won't respond for 10s, but
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+
// once the worker accepts, it sends headers (which fires `responded`).
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+
// Actually, slow-server only responds after delay, so headers won't
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+
// arrive until 10s. Instead, wait for the TCP socket to connect, then
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+
// give a small grace for the worker to accept the fd.
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+
const { body: responsePromise, connected } = httpGetWithConnect(port);
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+
await connected;
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+
// Small grace for the fd to transit to the worker and be opened.
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+
await new Promise((r) => setTimeout(r, 100));
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server.close();
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const result = await responsePromise;