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#!/usr/bin/env python3
"""
How much of the Music grid is whitespace.
Each artist used to get a grid container of their own, so an artist with a
single album got a heading and one cover on a row that fits five — and a real
library is mostly single-album artists. Consecutive singles now share one grid.
Measuring is the only way to check this: the layout is `auto-fill` over a width
nothing declares, so what matters is the *rendered* rectangles. This reports
every cover's position, which row it landed on, and how tall the grid is.
music_grid_probe.py
"""
import http.server
import json
import socketserver
import subprocess
import sys
import tempfile
import threading
import time
from pathlib import Path
STATIC = Path(__file__).resolve().parents[2] / "src" / "meshbay_hub" / "static"
PORT = 8757
RECORDS = []
socketserver.TCPServer.allow_reuse_address = True
FRAME = r"""<!doctype html><html><head><meta charset=utf-8>
<link rel="stylesheet" href="/style.css"></head><body>
<nav class="nav"><div class="nav-left"><a class="nav-brand" href="#/">MeshBay</a></div></nav>
<div class="layout"><main class="main"><div id="root"></div></main></div>
<script>
// Four albums of three tracks, each track titled so the queue can be read back
// unambiguously: "A2-t3" is the third track of the second album and nothing
// else. A fixture whose rows cannot be told apart measures nothing.
const ENTRIES = [];
let n = 0;
// Three artists with several albums each, and twelve with exactly one —
// roughly the proportion a real library has.
const MANY = [['Alpha', 3], ['Bravo', 2], ['Kilo', 4]];
const ONE = ['Charlie', 'Delta', 'Echo',
'Foxtrot Un Nom Vraiment Tres Long Qui Ne Tient Pas', 'Golf',
'Hotel', 'India', 'Juliett', 'Lima', 'Mike', 'November', 'Oscar'];
const add = (artist, album, i) => ENTRIES.push({
id: 'e' + (++n), name: `${i + 1} - t.flac`, display_title: `${album} ${i + 1}`,
path: `musique/${artist}/${album}`, type: 'audio', artist, album,
track_no: i + 1, duration: 200, size: 1024, added_at: 1750000000 + n,
});
for (const [artist, albums] of MANY) {
for (let a = 1; a <= albums; a++) {
for (let i = 0; i < 3; i++) add(artist, `${artist} disque ${a}`, i);
}
}
for (const artist of ONE) {
for (let i = 0; i < 3; i++) add(artist, `${artist} unique`, i);
}
const ACK = {
is_node_admin: false,
enabled_apps: ['files', 'music'],
tmdb_enabled: false, musicbrainz_enabled: false,
video_directories: [], music_directories: ['musique'], photo_directories: [],
};
window.MeshBayTransport = function () {
const self = {
connected: false, memberRole: 'member', supportsAppOps: true,
sessionKeys: null, gekRaw: null,
newNodeBundle: null, newNodeBundleRecovery: null,
async connect() { self.connected = true; return ACK; },
async fetchIndex() {
return { entries: ENTRIES, dirs: ['musique'],
roots: [{ name: 'musique', available: true, writable: false,
removable: false }] };
},
async fetchChatHistory() { return { messages: [], hasMore: false }; },
async fetchLinkPreview() { return { ok: false }; },
// Real, not left to the Proxy below: that would hand back a promise
// where an unsubscribe belongs, and the page calls it on unmount.
addReconnectListener() { return () => {}; },
close() {},
};
return new Proxy(self, {
get(target, prop) {
if (prop in target) return target[prop];
if (typeof prop === 'string' && prop.startsWith('on')) return undefined;
if (typeof prop === 'symbol') return undefined;
return () => new Promise(() => {});
},
set(target, prop, value) { target[prop] = value; return true; },
});
};
</script>
<script type="module">
import { html, render, useState, useCallback } from '/vendor/htm-preact.js';
import { initLocale } from '/i18n.js';
import { GroupPage } from '/group-page.js';
import { MusicPlayerBar } from '/music-player.js';
const LOGS = [];
addEventListener('error', (e) => LOGS.push('error: ' + (e.message || e)));
addEventListener('unhandledrejection',
(e) => LOGS.push('rejection: ' + ((e.reason && (e.reason.stack || e.reason.message)) || e.reason)));
const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
const waitFor = async (sel, tries = 60) => {
for (let i = 0; i < tries; i++) {
const el = document.querySelector(sel);
if (el) return el;
await sleep(50);
}
return null;
};
// The shell's two jobs, and only those: hold the queue, and pass `op` through.
// app.js does more (a transport fast path, the stop button); the contract this
// exercises is the shape of what it hands the player.
function Harness() {
const [queue, setQueue] = useState(null);
const onPlayQueue = useCallback((tracks, startIndex, source, op) => {
setQueue({ tracks, startIndex, nonce: Date.now(), op: op || 'replace' });
}, []);
// A queue that crosses groups cannot be built from one group's page, and
// that is the case the skipping rule exists for — so the probe reaches in
// for that one step rather than pretending a gesture builds it.
window.__probePlayQueue = onPlayQueue;
// Rejects at once for a group nothing serves, and hangs for every other —
// hanging is what the stub node does anyway, and what matters here is which
// track the playhead lands on, not whether anything plays.
const getConnection = (groupId) => (String(groupId).startsWith('dead')
? Promise.reject(new Error('no node'))
: new Promise(() => {}));
return html`
<${GroupPage} groupId="g1" token="t" username="me" userId="u1"
group=${{ id: 'g1', name: 'un groupe', owner_username: 'me', is_admin: false }}
userPrefs=${{ default_tab: 'music', media_page_size: '50' }}
onPlayQueue=${onPlayQueue} />
${queue && html`<${MusicPlayerBar} getConnection=${getConnection}
queue=${queue} userPrefs=${{}} onClose=${() => setQueue(null)} />`}
`;
}
const steps = [];
// The queue as a person sees it: the player's own panel, opened and closed.
async function queueNow(label, extra) {
const open = document.querySelector('.music-player-extra .music-player-btn');
if (!open) { steps.push({ step: label, bar: false, ...extra }); return; }
open.click();
const panel = await waitFor('.music-detail .music-tracklist');
const rows = [...document.querySelectorAll('.music-detail .music-tracklist .music-track-row')];
steps.push({
step: label,
bar: true,
play: rows.map((r) => r.querySelector('.music-track-title').textContent),
playing: (rows.findIndex((r) => r.classList.contains('active'))),
nowPlaying: (document.querySelector('.music-player-title') || {}).textContent || null,
...extra,
});
const close = document.querySelector('.music-detail .video-close');
if (close) close.click();
await sleep(120);
}
const rightClick = (el) => el.dispatchEvent(new MouseEvent('contextmenu', {
bubbles: true, cancelable: true, clientX: 200, clientY: 200 }));
const menuLabels = () => [...document.querySelectorAll('.ctx-menu .ctx-menu-item')]
.map((b) => b.querySelector('.ctx-menu-label').textContent);
const clickMenu = async (i) => {
const items = [...document.querySelectorAll('.ctx-menu .ctx-menu-item')];
items[i].click();
await sleep(200);
};
(async () => {
const fail = (why) => parent.postMessage(
{ error: why, logs: LOGS.slice(0, 12),
text: (document.getElementById('root').textContent || '').slice(0, 400) }, '*');
try {
await initLocale();
render(html`<${Harness} />`, document.getElementById('root'));
// Every tile mounts on intersection, so the page has to be walked.
for (let i = 0; i < 60; i++) {
scrollTo(0, document.documentElement.scrollHeight);
await sleep(60);
if (document.querySelectorAll('.music-card').length >= 21) break;
}
scrollTo(0, 0);
await sleep(300);
// Reported rather than asserted here: how *many* covers a walk of the page
// reaches is itself a property of the layout, and the caller is better
// placed to judge it than the probe is.
const cards = [...document.querySelectorAll('.music-card')];
// Group covers by the row they landed on, in document order.
const rows = [];
for (const c of cards) {
const r = c.getBoundingClientRect();
const top = Math.round(r.top + scrollY);
const cell = c.closest('.music-pool-cell');
const label = c.querySelector('.music-card-sub').textContent;
const heading = cell ? cell.querySelector('.music-pool-heading') : null;
const last = rows[rows.length - 1];
const entry = { artist: label, top,
heading: heading ? heading.textContent : null,
headingH: heading ? Math.round(heading.getBoundingClientRect().height) : null };
if (last && Math.abs(last.top - top) < 8) last.cells.push(entry);
else rows.push({ top, cells: [entry] });
}
parent.postMessage({ steps: [{
step: 'grid',
cards: cards.length,
rows: rows.map((r) => r.cells.map((c) => c.artist)),
cells: rows.map((r) => r.cells),
poolHeadings: [...document.querySelectorAll('.music-pool-heading')].length,
// A pooled cell's heading carries both classes; these are the ones that
// sit *above a grid* rather than inside a cell.
headings: [...document.querySelectorAll(
'.music-artist-heading:not(.music-pool-heading)')].map((h) => h.textContent),
pools: document.querySelectorAll('.music-artist-pool').length,
gridHeight: Math.round(document.querySelector('.main').scrollHeight),
width: innerWidth,
}], logs: LOGS.slice(0, 8) }, '*');
} catch (err) {
fail(String((err && err.stack) || err));
}
})();
</script></body></html>"""
PAGE = r"""<!doctype html><html><head><meta charset=utf-8></head>
<body style="margin:0"><div id="frames"></div><script>
addEventListener('message', (e) => {
fetch('/log', { method: 'POST', body: JSON.stringify(e.data) });
});
const f = document.createElement('iframe');
f.src = '/case';
f.style.cssText = 'width:1100px;height:800px;border:0;display:block';
document.getElementById('frames').appendChild(f);
</script></body></html>"""
class H(http.server.BaseHTTPRequestHandler):
def log_message(self, *a):
pass
def do_POST(self):
length = int(self.headers.get("Content-Length") or 0)
if self.path == "/log":
RECORDS.append(json.loads(self.rfile.read(length).decode()))
else:
self.rfile.read(length)
self.send_response(204)
self.end_headers()
def _send(self, body: bytes, ctype: str) -> None:
self.send_response(200)
self.send_header("Content-Type", ctype)
self.send_header("Content-Length", str(len(body)))
self.end_headers()
self.wfile.write(body)
def do_GET(self):
path = self.path.split("?")[0]
if path == "/":
self._send(PAGE.encode(), "text/html; charset=utf-8")
elif path == "/case":
self._send(FRAME.encode(), "text/html; charset=utf-8")
elif path == "/v1/groups/g1/nodes":
self._send(b'{"nodes": [{"node_id": "n1"}]}', "application/json")
else:
asset = (STATIC / path.lstrip("/")).resolve()
if not str(asset).startswith(str(STATIC)) or not asset.is_file():
self.send_response(404)
self.end_headers()
return
self._send(asset.read_bytes(),
"text/css" if asset.suffix == ".css"
else "text/javascript" if asset.suffix == ".js"
else "application/octet-stream")
def main() -> int:
with socketserver.TCPServer(("127.0.0.1", PORT), H) as srv:
threading.Thread(target=srv.serve_forever, daemon=True).start()
with tempfile.TemporaryDirectory(ignore_cleanup_errors=True) as profile:
proc = subprocess.Popen(
["google-chrome", "--headless=new", "--disable-gpu", "--no-sandbox",
f"--user-data-dir={profile}", "--window-size=1100,900",
f"http://127.0.0.1:{PORT}/"],
stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
for _ in range(400):
if RECORDS:
break
time.sleep(0.1)
proc.terminate()
try:
proc.wait(timeout=10)
except subprocess.TimeoutExpired:
proc.kill()
proc.wait()
if not RECORDS:
print(json.dumps({"error": "no measurement"}), file=sys.stderr)
return 1
print(json.dumps(RECORDS[0], indent=1))
return 0
if __name__ == "__main__":
raise SystemExit(main())
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