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// A warm player's sound is started before the swipe lands (an Android
// phone held a still picture ~250 ms on a player's first play with sound):
// the next clip plays at a volume nobody hears until its picture moves,
// and pauses there, a frame or two in — not seeked back. Clips over 25 MB
// aren't (once played, a player reads the whole file): pager-eager-test.
// Run: bun tools/pager-prime-test.js
//
// (adapted from pager-eager-test:)
// Flipping through clips in the pager is asking to watch them: a clip plays
// at once whatever it costs — even one over the size budget, which in the
// feed waits under a tap-to-play cover — and the next two get a head start:
// their opening fetched into the cache, no more of a big file than that, and
// the player takes it from there. How much: a couple of seconds' worth of
// the clip on a link well ahead of its bitrate (the second clip ahead, half
// that); on a link slower than the clip, more — to the 4 MB cap. With Data
// Saver on, the pager is careful again: such a clip waits for a tap and
// nothing loads ahead.
import puppeteer from './puppeteer.js';
import { cacheKeyFor } from '../src/wallet.js';
import { generateSecretKey, getPublicKey, finalizeEvent } from 'nostr-tools/pure';
import { buildHtml } from '../build.js';
import { existsSync, statSync } from 'node:fs';
const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
let ok = true;
const check = (n, c, d = '') => { console.log(` ${c ? '✓' : '✗'} ${n}${d ? ' — ' + d : ''}`); if (!c) ok = false; };
// small clips with sound (a tone), ~2 MB each: under the 25 MB a warm player is primed up to
const BIG = '/tmp/coinos-prime-small.webm';
if (!existsSync(BIG)) Bun.spawnSync(['ffmpeg', '-y', '-loglevel', 'error', '-f', 'lavfi', '-i', 'testsrc=s=180x320:r=15', '-f', 'lavfi', '-i', 'sine=f=440', '-t', '50', '-c:v', 'libvpx', '-b:v', '300k', '-c:a', 'libvorbis', BIG]);
const SIZE = statSync(BIG).size;
const FILE = new Uint8Array(await Bun.file(BIG).arrayBuffer());
const NAMES = ['c0', 'c1', 'c2', 'c3', 'c4'];
const SK = generateSecretKey(), AUTHOR = getPublicKey(SK);
const now = Math.floor(Date.now() / 1000);
const post = (content, ago) => finalizeEvent({ kind: 1, created_at: now - ago, tags: [], content }, SK);
const html = await buildHtml({ minify: true, pwa: false });
// every request for a clip's bytes: who asked (the player, or a fetch), the
// range, and the bytes actually sent (pulled by the reader, in 64 KB pieces)
let log = [];
let pace = 0; // bytes a second the server sends a clip at (0: as fast as it can) — a slow link
const server = Bun.serve({ port: 0, idleTimeout: 60, fetch: (req) => {
const path = new URL(req.url).pathname;
const m = /^\/(c\d)\.webm$/.exec(path);
if (m) {
const headers = { 'content-type': 'video/webm', 'accept-ranges': 'bytes', etag: '"' + m[1] + '-v1"', 'last-modified': 'Mon, 05 Oct 2026 00:00:00 GMT', 'cache-control': 'public, max-age=3600' };
if (req.method === 'HEAD') return new Response(null, { headers: { ...headers, 'content-length': String(SIZE) } });
const rg = /bytes=(\d+)-(\d*)/.exec(req.headers.get('range') || '');
const start = rg ? +rg[1] : 0, end = rg && rg[2] ? Math.min(+rg[2], SIZE - 1) : SIZE - 1;
const entry = { clip: m[1], dest: req.headers.get('sec-fetch-dest') || '', start, end, sent: 0 };
log.push(entry);
let at = start;
const t0 = Date.now();
const body = new ReadableStream({ async pull(ctl) {
if (at > end) { ctl.close(); return; }
if (pace) { const due = t0 + ((at - start) / pace) * 1000; if (due > Date.now()) await new Promise((r) => setTimeout(r, due - Date.now())); }
const n = Math.min(65536, end - at + 1);
ctl.enqueue(FILE.subarray(at, at + n)); at += n; entry.sent += n;
} }, { highWaterMark: 0 });
return new Response(body, { status: rg ? 206 : 200, headers: { ...headers, 'content-length': String(end - start + 1), ...(rg ? { 'content-range': `bytes ${start}-${end}/${SIZE}` } : {}) } });
}
if (path.startsWith('/punks') || path === '/verify-worker.js') return new Response(Bun.file('dist' + path));
return new Response(html, { headers: { 'content-type': 'text/html' } });
} });
const U = (n) => server.url.origin + '/' + n + '.webm';
const seeded = [
// each says its size and length (as Primal's and others' imeta do): a bitrate of SIZE / 50 bytes a second
...NAMES.map((n, i) => finalizeEvent({ kind: 1, created_at: now - 100 - i * 100, tags: [['imeta', 'url ' + U(n), 'm video/webm', 'size ' + SIZE, 'duration 50', 'dim 180x320']], content: 'clip ' + n + ' here ' + U(n) }, SK)),
...Array.from({ length: 6 }, (_, i) => post('filler ' + i + ' ' + 'lorem ipsum dolor sit amet. '.repeat(5), 900 + i * 60)),
];
const sent = (clip, dest) => log.filter((e) => e.clip === clip && (!dest || e.dest === dest)).reduce((a, e) => a + e.sent, 0);
const kb = (n) => Math.round(n / 1024) + ' KB';
const RATE = SIZE / 50, HEAD_MAX = 4 * 1024 * 1024;
const heads = (clip) => log.filter((e) => e.clip === clip && e.dest === 'empty');
const near = (a, b) => Math.abs(a - b) <= b * 0.02 + 1;
const browser = await puppeteer.launch({ executablePath: '/usr/bin/google-chrome', headless: 'new', args: ['--no-sandbox', '--autoplay-policy=no-user-gesture-required'] });
async function run() {
log = [];
const ctx = await browser.createBrowserContext();
const page = await ctx.newPage();
await page.evaluateOnNewDocument(() => {
const Real = window.WebSocket;
window.WebSocket = function (...a) { const ws = new Real(...a); const send = ws.send.bind(ws); ws.send = (d) => { try { const m = JSON.parse(d); if (m[0] === 'REQ') { setTimeout(() => ws.dispatchEvent(new MessageEvent('message', { data: JSON.stringify(['EOSE', m[1]]) })), 0); return; } if (m[0] === 'EVENT') return; } catch {} return send(d); }; return ws; };
window.WebSocket.prototype = Real.prototype; Object.assign(window.WebSocket, Real);
});
const errs = [];
page.on('pageerror', (e) => errs.push(String(e)));
const click = (t) => page.evaluate((x) => { const e = [...document.querySelectorAll('button')].find((n) => n.textContent.trim().toLowerCase().includes(x)); if (e) { e.click(); return true; } return false; }, t);
const waitText = async (x, ms = 25000) => { for (let i = 0; i < ms / 250; i++) { if ((await page.evaluate(() => document.body.innerText)).toLowerCase().includes(x)) return true; await sleep(250); } return false; };
const waitFor = async (fn, arg, ms = 10000) => { for (let i = 0; i < ms / 100; i++) { if (await page.evaluate(fn, arg)) return true; await sleep(100); } return false; };
const vid = (n) => page.evaluate((n) => { const s = [...document.querySelectorAll('.mp-slide')].find((x) => x.getAttribute('data-k').endsWith('/' + n + '.webm')); const v = s && s.querySelector('video.mp-media'); return v ? { src: !!v.getAttribute('src'), paused: v.paused, t: v.currentTime, volume: v.volume, muted: v.muted } : null; }, n);
try {
await page.setViewport({ width: 390, height: 844 });
pace = 12_500_000;
await page.goto(server.url.href, { waitUntil: 'domcontentloaded' });
await page.evaluate(() => localStorage.setItem('btc-wallet-network', 'regtest'));
await page.reload({ waitUntil: 'domcontentloaded' }); await sleep(400);
await click('create a new wallet'); await sleep(600);
await page.waitForSelector('.words .w .t');
const mn = (await page.$$eval('.words .w .t', (l) => l.map((e) => e.textContent.trim()))).join(' ');
await click('skip verification');
await waitText('receive', 20000);
const base = cacheKeyFor(mn + '\n');
await page.evaluate(([k, pk, ns]) => {
localStorage.setItem(k + ':follows', JSON.stringify({ tags: [['p', pk]], c: '', at: Math.floor(Date.now() / 1000) }));
localStorage.setItem(k + ':feedNotes', JSON.stringify(ns));
localStorage.setItem(k + ':profiles', JSON.stringify({ [pk]: { name: 'Prime Poster', t: Date.now() } }));
localStorage.setItem('btc-wallet-feed:' + k, 'following');
}, [base, AUTHOR, seeded]);
await page.reload({ waitUntil: 'domcontentloaded' });
await waitText('receive', 20000);
await page.evaluate(() => document.querySelector('.app-nav-button[aria-label="Feed"]').click());
await page.waitForSelector('.notes-feed video.note-video', { timeout: 20000 });
const r = await page.evaluate(() => { const row = [...document.querySelectorAll('.notes-feed [data-key]')].find((n) => n.textContent.includes('clip c0 here')); row.querySelector('.note-video-box').scrollIntoView({ block: 'center' }); const v = row.querySelector('video.note-video').getBoundingClientRect(); return { x: v.x + v.width * 0.2, y: v.y + v.height * 0.3 }; });
await sleep(800);
await page.mouse.click(r.x, r.y);
check('the pager opens', await waitFor(() => !!document.querySelector('.media-pager.videos'), null, 4000));
check('the next clip\'s warm player has played a moment, unheard, and waits paused a frame or two in', await waitFor(() => { const s = [...document.querySelectorAll('.mp-slide')].find((x) => x.getAttribute('data-k').endsWith('/c1.webm')); const v = s && s.querySelector('video.mp-media'); return v && v.paused && v.currentTime >= 0.03 && v.currentTime < 0.6; }, null, 10000), JSON.stringify(await vid('c1')));
const c1 = await vid('c1');
check('...its volume back to full, and quiet until it\'s on screen', c1.volume === 1 && c1.muted, JSON.stringify(c1));
await page.keyboard.press('ArrowDown');
await waitFor(() => coinosPagerStarts().starts.some((x) => /c1\.webm$/.test(x.url)), null, 5000);
const st = await page.evaluate(() => coinosPagerStarts().starts.find((x) => /c1\.webm$/.test(x.url)));
check('swiped to, it plays with sound, primed', st && st.primed && st.warm && st.ms < 1000 && await page.evaluate(() => { const v = document.querySelector('.mp-cur video.mp-media'); return !v.muted && v.volume === 1 && !v.paused; }), JSON.stringify(st));
check('no page errors', errs.length === 0, errs.slice(0, 2).join(' | '));
} finally { await ctx.close(); }
}
try { await run(); } finally { await browser.close(); server.stop(true); }
console.log(ok ? '\n✅ a warm player has its sound going before the swipe lands' : '\n❌ failed');
process.exit(ok ? 0 : 1);
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