123 lines
4.5 KiB
PHP
123 lines
4.5 KiB
PHP
<?php
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// Broadcast and track-history logic shared by the poller, the CLI tools and the live page.
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if (basename($_SERVER['SCRIPT_FILENAME'] ?? '') === basename(__FILE__)) {
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http_response_code(403);
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exit;
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}
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require_once __DIR__ . '/icecast.php';
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// A live broadcast not seen for this long is considered ended (covers brief encoder drop-outs)
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const BROADCAST_GRACE_MINUTES = 5;
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// Tracks are cleared this long after their broadcast ends
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const TRACK_RETENTION_MINUTES = 10;
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function liveBroadcast(PDO $db): ?array {
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$row = $db->query(
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'SELECT * FROM broadcasts
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WHERE started_at IS NOT NULL AND ended_at IS NULL
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ORDER BY started_at DESC LIMIT 1'
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)->fetch();
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return $row ?: null;
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}
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function pendingBroadcast(PDO $db): ?array {
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$row = $db->query(
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'SELECT * FROM broadcasts
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WHERE started_at IS NULL AND ended_at IS NULL
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ORDER BY created_at DESC LIMIT 1'
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)->fetch();
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return $row ?: null;
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}
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// The show for the live broadcast, or the queued one if nothing is live yet
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function currentShow(PDO $db): ?array {
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$row = $db->query(
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'SELECT s.* FROM broadcasts b
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JOIN shows s ON s.id = b.show_id
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WHERE b.ended_at IS NULL
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ORDER BY b.started_at IS NULL, b.started_at DESC, b.created_at DESC
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LIMIT 1'
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)->fetch();
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return $row ?: null;
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}
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// Assigns a show to the live broadcast, or queues it for the next one if nothing is live.
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// Returns 'live' or 'queued'.
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function setBroadcastShow(PDO $db, int $showId): string {
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$live = liveBroadcast($db);
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if ($live !== null) {
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$db->prepare('UPDATE broadcasts SET show_id = ? WHERE id = ?')->execute([$showId, $live['id']]);
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return 'live';
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}
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clearQueuedShow($db);
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$db->prepare('INSERT INTO broadcasts (show_id) VALUES (?)')->execute([$showId]);
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return 'queued';
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}
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function clearQueuedShow(PDO $db): void {
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$db->exec('DELETE FROM broadcasts WHERE started_at IS NULL');
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}
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// Tracks from the most recent broadcast that has started, newest first
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function recentTracks(PDO $db, int $limit = 100): array {
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$stmt = $db->prepare(
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'SELECT * FROM played_tracks
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WHERE broadcast_id = (SELECT id FROM broadcasts WHERE started_at IS NOT NULL ORDER BY started_at DESC LIMIT 1)
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ORDER BY played_at DESC, id DESC
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LIMIT ?'
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);
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$stmt->bindValue(1, $limit, PDO::PARAM_INT);
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$stmt->execute();
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return $stmt->fetchAll();
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}
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// Record one poll of the Icecast status. $track is the result of fetchCurrentTrack(): an array while
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// streaming or null when offline. (Don't call this when the status API was unreachable.)
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function recordPoll(PDO $db, ?array $track): void {
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$db->exec(
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'UPDATE broadcasts SET ended_at = last_seen_at
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WHERE started_at IS NOT NULL AND ended_at IS NULL
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AND last_seen_at < NOW() - INTERVAL ' . BROADCAST_GRACE_MINUTES . ' MINUTE'
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);
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$db->exec(
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'DELETE pt FROM played_tracks pt
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JOIN broadcasts b ON b.id = pt.broadcast_id
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WHERE b.ended_at < NOW() - INTERVAL ' . TRACK_RETENTION_MINUTES . ' MINUTE'
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);
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if ($track === null) return;
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$broadcast = liveBroadcast($db);
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if ($broadcast !== null) {
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$db->prepare('UPDATE broadcasts SET last_seen_at = NOW() WHERE id = ?')->execute([$broadcast['id']]);
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$broadcastId = (int)$broadcast['id'];
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} elseif (($pending = pendingBroadcast($db)) !== null) {
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$db->prepare('UPDATE broadcasts SET started_at = NOW(), last_seen_at = NOW() WHERE id = ?')->execute([$pending['id']]);
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$broadcastId = (int)$pending['id'];
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} else {
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// Nobody queued a show; record the broadcast anyway so track history still works
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$db->exec('INSERT INTO broadcasts (started_at, last_seen_at) VALUES (NOW(), NOW())');
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$broadcastId = (int)$db->lastInsertId();
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}
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if ($track['title'] === '') return;
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$stmt = $db->prepare('SELECT title, artist, album FROM played_tracks WHERE broadcast_id = ? ORDER BY played_at DESC, id DESC LIMIT 1');
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$stmt->execute([$broadcastId]);
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$last = $stmt->fetch();
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if ($last && $last['title'] === $track['title'] && $last['artist'] === $track['artist'] && $last['album'] === $track['album']) {
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return;
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}
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$db->prepare('INSERT INTO played_tracks (broadcast_id, title, artist, album, art_url) VALUES (?, ?, ?, ?, ?)')
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->execute([
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$broadcastId,
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mb_substr($track['title'], 0, 255),
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mb_substr($track['artist'], 0, 255),
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mb_substr($track['album'], 0, 255),
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lookupAlbumArt($track['artist'], $track['album']),
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]);
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}
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