julian.kiedaischandClaude Opus 5.5
416d5fdea3
test-filius refused every ticket as from the future: its clock was 886 ms behind the dashboard's machine, with NTP still 8 ms (one ticket in 125, as a ticket carries whole seconds). F now takes a ticket signed up to 5 s ahead (TICKET_AHEAD_SECONDS); itsdangerous refuses one second, and the oracle keeps that on record. tools/live measures and accepts on a live F, with fresh projects each run: m3 (200 rooms of the largest example with pings: probe p95 37 ms), m4 (63 KB document; dragging makes an update per pointer move, 59/s), m5 (an hour through the proxy), acceptance (two browsers, 14 checks, passed three times) and clock (F's clock against ours). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
29 lines
1.2 KiB
JavaScript
29 lines
1.2 KiB
JavaScript
// How far server F's clock is from this machine's: the moment F's Date header
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// turns to the next second, against our clock at that moment (the middle of
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// the two requests around it). A ticket carries whole seconds, and F refuses
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// one from its future, so F must not be behind the dashboard's machine.
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//
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// node tools/live/clock.mjs [host] [port]
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import http from 'node:http';
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const [host = '172.22.0.38', port = '8081'] = process.argv.slice(2);
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const agent = new http.Agent({ keepAlive: true, maxSockets: 1 });
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const ask = () =>
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new Promise((resolve, reject) => {
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const sent = Date.now();
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http
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.get({ host, port, path: '/healthz', agent }, (r) => {
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r.resume();
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r.on('end', () => resolve({ sent, got: Date.now(), date: Date.parse(r.headers.date) }));
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})
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.on('error', reject);
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});
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let last = await ask();
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const offsets = [];
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for (const end = Date.now() + 6000; Date.now() < end;) {
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const now = await ask();
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if (now.date !== last.date) offsets.push(Math.round(now.date - (last.got + now.sent) / 2) + `±${Math.ceil((now.sent - last.got) / 2)}`);
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last = now;
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}
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agent.destroy();
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console.log(`${host}:${port} clock minus ours (ms): ${offsets.join(' ')}`);
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